CN105022112B - The lighting device of coherent source is used - Google Patents

Abstract

The present invention relates to the lighting device for having used coherent source.Laser beam (L50) caused by laser light source (50) is reflected by beam sweep device (60), expose to hologram recording medium (45).In hologram recording medium (45), the picture (35) of scatter plate is recorded as hologram using the reference light of strafing basic point (B) is converged at.Beam sweep device (60) makes laser beam (L50) expose to hologram recording medium (45) after basic point (B) bending is strafed.At this time, change over time the bending state of laser beam, so that the laser beam (L60) after bending changes over time the irradiation position of hologram recording medium (45).Unrelated with the irradiation position of beam, the diffraction light (L45) from hologram recording medium (45) makes the reproduction image (35) of identical scatter plate be reproduced in same position.Smooth surface (R) in lighting object thing (70) forms the lighting point after spot is suppressed by the reproduction image (35) of hologram.

Description

The lighting device of coherent source is used

The application is the applying date for September in 2010 7 days, Application No. 201080069001.1, entitled " uses The divisional application of the patent application of the lighting device of coherent source ", entire contents are hereby expressly incorporated by reference.

Technical field

The present invention relates to a kind of lighting device for having used coherent source.Particularly, the present invention relates to will be by laser light The coherent light that source produces is used as the technology for reducing speckle noise in the lighting device of illumination light.

Background technology

As the light source of lighting device, incandescent lamp bulb or fluorescent lamp are used at present.Moreover, for requiring highlight illumination light Lighting device, mercury vapor lamp, halogen lamp, xenon lamp etc. are used as light source.For example, in Japanese Unexamined Patent Publication 2004-264512 publications Disclose the lighting device and its projection type video display device for having used extra-high-pressure mercury vapour lamp.Recently, LED is used as light source Lighting device also begins to popularize.The service life of LED generally more than 10,000 hours, leads to as replacement incandescent lamp bulb or the new of fluorescent lamp Attracted attention with light source.

On the other hand, laser light source utilizes extensively as the various fields of the light source of coherent light industrially are produced.Tool For body, the inherent features such as monochromaticjty, directionality, interference are applied flexibly, make laser in the system of optical communication field, semiconductor devices Optical fields such as field, hologram etc. are made to be widely used.Particularly, have abundant as practical light source, semiconductor laser The long service life, and the utilization ratio of energy is also extremely excellent.Although having the advantages that such a, the illumination of laser light source has been used to fill Put so far not yet popularize the reason for be with produce speckle noise it is peculiar the problem of.

Spot (speckle) is that the coherent light of laser etc. is exposed to mottled decorative pattern caused by diffusingsurface, is being incited somebody to action When laser exposes to lighting object thing, mottled brightness disproportionation can be observed in shadow surface.For example, in laser pointer indicator panel In the case of upper 1 point of curtain, laser spots flashing on the screen can be observed.Speckle noise is produced on the screen, is become to seeing The person of examining causes the main reason for harmful effect physiologically.The reason for being caused using coherent light and produced spot, is, in screen etc. Coherent light after each portion reflection of diffusely reflecting surface is interfered with each other because of its high interference.For example, in " Speckle In Phenomena in Optics, Joseph W.Goodman, Roberts＆Co., 2006 ", spot is produced and has been carried out in detail Theoretical investigation.

Used as laser pointer, then observer only observes small point, will not produce big problem.If however, it will swash Radiant is used as the light source of lighting device and by the wide region to a certain degree of coherent light illumination, then because being produced in illumination region Speckle noise, causes observer harmful effect physiologically, and the symptom such as uncomfortable occurs.Due to this problem, In the past, the lighting device of laser light source has been used to be not suitable for general service.

Certainly, it was also proposed that be used for the various specific methods for reducing this speckle noise.For example, in Japanese Unexamined Patent Publication 6- No. 208089 publications are disclosed to be exposed to scatter plate by laser and is used as illumination light and being revolved by motor by the scattering light obtained from it Turn driving scatter plate, so as to reduce the technology of spot.Moreover, it is disclosed in laser in Japanese Unexamined Patent Publication 2004-144936 publications Light diffusion element is configured between light source and lighting object thing and light diffusion element vibration is reduced the technology of spot.So And rotate scatter plate or light diffusion element vibration is needed big machinery driving mechanism, device integrally maximizes and power consumption Increase.Moreover, such a method, which differs, surely effectively removes deblurring.

Therefore, it is an object of the invention to provide a kind of high efficiency in the lighting device for used coherent source and fully Ground suppresses the technology that spot produces.

The content of the invention

The 1st aspect of the present invention is a kind of lighting device for having used coherent source, it is characterised in that is possessed：Coherent light Source, produces coherent beam；Hologram recording medium, record have the picture of scatter plate；And beam sweep device, the light beam is shone The hologram recording medium is incident upon, and the irradiation position of the hologram recording medium is changed over time with the light beam Mode is strafed, and in the hologram recording medium, using the reference light irradiated along regulation light path, record has the scatter plate As being used as hologram, the coherent source produces the light beam of the wavelength with the picture that can reproduce the scatter plate, and the light beam is swept Injection device is so that the light beam is along the direction of the light path of the reference light to the direction of illumination of the hologram recording medium Mode, carries out strafing for the light beam, the reproduction light conduct of the picture of the scatter plate obtained from the hologram recording medium Illumination light.

The 2nd aspect of the present invention is the lighting device for having used coherent source that above-mentioned first method is related to, and is to use The lighting device of coherent source, it is characterised in that beam sweep device makes light beam strafe basic point bending defined, after bending Light beam expose to hologram recording medium, and by changing over time the bending state of the light beam, so that after bending Light beam the irradiation position of the hologram recording medium is changed over time, in the hologram recording medium, use meeting Gather the reference light in specific convergent point or the reference light from the diverging of specific convergent point, record has the picture of scatter plate as holographic Figure, the beam sweep device strafe basic point using the convergent point described in and carry out strafing for light beam.

The 3rd aspect of the present invention is the lighting device for having used coherent source that above-mentioned second method is related to, and is to use The lighting device of coherent source, it is characterised in that in hologram recording medium, using along using convergent point as the circular cone on vertex The reference light that side is dimensionally assembled or dissipated, record have the picture of scatter plate.

The 4th aspect of the present invention is the lighting device for having used coherent source that above-mentioned Third Way is related to, and is to use The lighting device of coherent source, it is characterised in that beam sweep device have make light beam with comprising the plane for strafing basic point The function that the mode of oscillating motion is bent, and light beam is strafed in one-dimensional square on hologram recording medium.

The 5th aspect of the present invention is the lighting device for having used coherent source that above-mentioned Third Way is related to, and is to use The lighting device of coherent source, it is characterised in that beam sweep device have make light beam with comprising the 1st plane for strafing basic point The upper function that bends of mode of carrying out oscillating motion and make light beam with comprising strafing basic point and orthogonal with the 1st plane The function that the mode of oscillating motion is bent is carried out in 2nd plane, and light beam is swept in two-dimensional directional on hologram recording medium Penetrate.

The 6th aspect of the present invention is the lighting device for having used coherent source that above-mentioned second method is related to, and is to use The lighting device of coherent source, it is characterised in that in hologram recording medium, using along the planar comprising convergent point Assemble or the reference light of diverging, record have the picture of scatter plate.

The 7th aspect of the present invention is the lighting device for having used coherent source that above-mentioned 6th mode is related to, and is to use The lighting device of coherent source, it is characterised in that beam sweep device have make light beam with comprising the plane for strafing basic point The function that the mode of oscillating motion is bent is carried out, and light beam is strafed in one-dimensional square on hologram recording medium.

The 8th aspect of the present invention is the lighting device for having used coherent source that above-mentioned first method is related to, and is to use The lighting device of coherent source, it is characterised in that beam sweep device is by making light beam be exposed to while moving in parallel entirely Seal recording medium is ceased, so that the light beam changes over time the irradiation position of the hologram recording medium, described complete Cease in seal recording medium, using the reference light being made of collimated light beam, record has the picture of scatter plate as hologram, the light beam Strafe device and light beam is exposed into the hologram recording medium from the direction with reference to parallel light, to carry out sweeping for light beam Penetrate.

The 9th aspect of the present invention is the above-mentioned first lighting device for having used coherent source being related to eighth mode, is The lighting device of coherent source is used, it is characterised in that coherent source is the laser light source for producing laser beam.

The 10th aspect of the present invention is the lighting device for having used coherent source that the above-mentioned first to the 9th mode is related to, and is The lighting device of coherent source is used, it is characterised in that hologram recording medium record has the picture of scatter plate as volume type Hologram.

The 11st aspect of the present invention is the lighting device for having used coherent source that the above-mentioned first to the 9th mode is related to, It is the lighting device for having used coherent source, it is characterised in that hologram recording medium record has the picture of scatter plate as surface Embossed holographic figure.

The 12nd aspect of the present invention is the lighting device for having used coherent source that the above-mentioned first to the 9th mode is related to, It is the lighting device for having used coherent source, it is characterised in that the hologram for being recorded in hologram recording medium is that computer closes Into hologram.

The 13rd aspect of the present invention is the lighting device for having used coherent source that the above-mentioned first to the 9th mode is related to, It is the lighting device for having used coherent source, it is characterised in that the hologram for being recorded in hologram recording medium is that Fourier becomes Change hologram.

The 14th aspect of the present invention is the lighting device for having used coherent source that the above-mentioned first to the 9th mode is related to, It is the lighting device for having used coherent source, it is characterised in that the hologram for being recorded in hologram recording medium is that reflection-type is complete Breath figure, and the reflection diffracting light of light beam is used as illumination light.

The 15th aspect of the present invention is the lighting device for having used coherent source that the above-mentioned first to the 9th mode is related to, It is the lighting device for having used coherent source, it is characterised in that the hologram for being recorded in hologram recording medium is that transmission-type is complete Breath figure, and the transmission diffraction light of light beam is used as illumination light.

The 16th aspect of the present invention is that the illumination for having used coherent source that the above-mentioned first to the 15th mode is related to fills Put, be the lighting device for having used coherent source, it is characterised in that beam sweep device is to strafe type mirror device, total reflection rib Mirror, refracting prisms or photoelectric crystal.

The 17th aspect of the present invention is that the illumination for having used coherent source that the above-mentioned first to the 16th mode is related to fills Put, be the lighting device for having used coherent source, it is characterised in that coherent source is with list of the generation with different wave length respectively More of the laser beam of coloured light are that n platforms laser light source and the laser beam for producing the n platforms laser light source are synthesized to generate synthesis The light synthesizer of light beam, beam sweep device strafe the synthesis light of the light synthesizer generation on hologram recording medium Beam, in the hologram recording medium, reproduction image can be obtained respectively with each laser beam produced by the n platforms laser light source Mode record the picture of scatter plate as n kind holograms.

The 18th aspect of the present invention is that possess the photograph for having used coherent source that the above-mentioned first to the 17th mode is related to The display medium of bright device and smooth surface with the illumination for receiving the lighting device, it is characterised in that recorded in hologram Record has the picture of the scatter plate for the transmission film covering for being decorated with specified image in medium, and the smooth surface configuration is forming described dissipate Penetrate the position of the reproduction image of plate.

The nineteenth aspect of the present invention is a kind of means of illumination for having used coherent source, it is characterised in that is had：Prepare In the stage, be recorded on recording medium so as to create hologram recording medium by regarding the picture of scatter plate as hologram；And Illumination phase, coherent beam is exposed on the hologram recording medium, and in a manner of changing over time irradiation position, The light beam is strafed on the hologram recording medium, in the preparation stage, relevant illumination is dissipated to described Penetrate plate, the scattering light obtained from the scatter plate be used as object light, will be exposed to along regulation light path the recording medium and It is used as reference light, and the interference that will be formed by the object light and the reference light with the coherent light of the illumination light phase co-wavelength Strip record is in the recording medium, so as to create the hologram recording medium, in the illumination phase, with can make The light beam for the wavelength that the picture of the scatter plate reproduces is by the light path of the light path along the reference light and towards the hologram recording The mode of irradiation position on recording medium is strafed, by the scatter plate obtained from the hologram recording medium as Light is reproduced as illumination light.

The twentieth aspect of the present invention is the means of illumination for having used coherent source that above-mentioned 19th aspect is related to, and is to make With the means of illumination of coherent source, it is characterised in that in the preparation stage, there is Jiao by using in the position of specified convergent point The convex lens of point makes the beam condenser of almost parallel coherent light, so as to produce the reference light dimensionally assembled in the convergent point Or the reference light dimensionally dissipated from the convergent point, and use the record of the reference light progress interference fringe produced.

The 20th one side of the present invention is the means of illumination for having used coherent source that above-mentioned 19th aspect is related to, and is The means of illumination of coherent source is used, it is characterised in that in the preparation stage, by using with parallel with specified optically focused axis The cylindrical lens of central shaft makes the beam condenser of almost parallel coherent light on the optically focused axis, so as to produce in the optically focused The reference light that point on axis is two-dimensionally assembled or the reference light two-dimensionally dissipated from the point on the optically focused axis, use the ginseng of generation Irradiation carries out the record of interference fringe.

The 22nd aspect of the present invention is the means of illumination for having used coherent source that above-mentioned 19th aspect is related to, and is The means of illumination of coherent source is used, it is characterised in that in the preparation stage, carried out using the reference light being made of collimated light beam The record of interference fringe.

The present invention the 23rd aspect be it is above-mentioned 19th to the 22nd aspect be related to used coherent source Means of illumination, is the means of illumination for having used coherent source, it is characterised in that is transported by using the simulation of imaginary scatter plate The processing for performing the preparation stage is calculated, computer-generated hologram is recorded in hologram recording medium.

The twenty-fourth aspect of the present invention is the means of illumination for having used coherent source that above-mentioned 23rd aspect is related to, It is the means of illumination for having used coherent source, it is characterised in that as imaginary scatter plate, using in the plane by multiple light Source is arranged in the model of clathrate.

The 25th aspect of the present invention is a kind of lighting device for having used coherent source, it is characterised in that is possessed：Phase Dry light source, produces coherent beam；Microlens array, includes the aggregate of multiple separate lenses；And beam sweep device, by institute State light beam and expose to the microlens array, and the irradiation position of the microlens array is changed over time with the light beam Mode is strafed, and the separate lenses for forming the microlens array have the anaclasis made from beam sweep device irradiation respectively To form the function of specifying irradiation area on smooth surface is specified, and it is configured to the irradiation formed by any one separate lenses Region becomes roughly the same common region on the smooth surface.

The 26th aspect of the present invention is the lighting device for having used coherent source that above-mentioned 25th aspect is related to, It is the lighting device for having used coherent source, it is characterised in that beam sweep device makes light beam strafe basic point bending simultaneously specified Expose to microlens array and change over time the bending state of the light beam, so that the light beam after bending is to described micro- The irradiation position of lens array changes over time, and forming the separate lenses of the microlens array makes to penetrate from the basic point of strafing respectively The anaclasis entered, and common irradiation area is formed on smooth surface.

The 27th aspect of the present invention is related to a kind of lighting device for having used coherent source, it is characterised in that possesses： Coherent source, produces coherent beam；Beam sweep device, by controlling direction or position or the both of the light beam, so that Carry out beam sweep；And light diffusion element, make beam spread and the injection of injection, the beam sweep device will be described relevant The light beam that light source produces is projected towards the light diffusion element, and the incident position with the light beam to the light diffusion element Put the mode changed over time to strafe, the light diffusion element has and makes the beam spread of injection to be formed on smooth surface is specified The function of irradiation area is specified, and be configured to the irradiation area to be formed to become roughly the same common area on the smooth surface Domain and it is unrelated with the incoming position of light beam.

Brief description of the drawings

Fig. 1 is the optical system for showing to create the inscape i.e. processing of hologram recording medium of the lighting device of the present invention The configuration diagram of system.

Fig. 2 is position relationships of the section S1 with hologram light-sensitive medium 40 of reference light L23 in the processing shown shown in Fig. 1 Top view.

Fig. 3 is positions of another section S2 with hologram light-sensitive medium 40 of reference light L23 in the processing shown shown in Fig. 1 The top view of relation.

Fig. 4 is the magnified partial view around scatter plate 30 and hologram light-sensitive medium 40 in optical system shown in Fig. 1.

Fig. 5 is shown with the reproduction scatter plate of hologram recording medium 45 of the processing establishment shown in Fig. 1 as 35 The figure of processing.

Fig. 6 is to show that only to irradiate 1 light beam scattered to reproduce to the hologram recording medium 45 that is created with the processing shown in Fig. 1 Penetrate the figure of the processing of the picture 35 of plate.

Fig. 7 is to show that only irradiating 1 light beam to the hologram recording medium 45 created with the processing shown in Fig. 1 makes scatter plate Picture 35 come another figure of processing for reproducing.

Fig. 8 is the top view of the irradiation position of light beam in the reproduction processes shown shown in Fig. 6 and Fig. 7.

Fig. 9 is the side view of the composition for the lighting device 100 for showing the basic embodiment of the present invention.

Figure 10 is the side view for the state that the lighting device 100 being shown with shown in Fig. 9 illuminates lighting object thing 70.

Figure 11 is to show the lighting device 100 shown in Fig. 9 being installed on top surface and illuminate the state of the upper surface of desk Side view.

Figure 12 is that light beam on hologram recording medium 45 strafes mode in the lighting device 100 shown shown in Fig. 9 The top view of the 1st.

Figure 13 is that light beam on hologram recording medium 45 strafes mode in the lighting device 100 shown shown in Fig. 9 The top view of the 2nd.

Figure 14 is that light beam on hologram recording medium 45 strafes mode in the lighting device 100 shown shown in Fig. 9 The top view of the 3rd.

Figure 15 is that light beam on hologram recording medium 45 strafes mode in the lighting device 100 shown shown in Fig. 9 The top view of the 4th.

Figure 16 be the hologram recording medium 85 for being shown with banding in the case of light beam the top view for strafing mode.

Figure 17 is the configuration for showing to create the optical system of the processing of the hologram recording medium 85 of the banding shown in Figure 16 Figure.

Figure 18 is the inscape i.e. hologram recording medium for showing to create the lighting device of the present invention in the method for CGH The side view of principle.

Figure 19 is the front view of the imaginary scatter plate 30 ' shown in Figure 18.

Figure 20 is the table for showing the experimental result based on the spot reducing effect of the invention obtained.

Figure 21 is the figure for the configuration example for showing the light source in the case of carrying out white illumination based on lighting device of the invention.

Figure 22 is the multifarious top view of used scatter plate when showing to create the lighting device of the present invention.

Figure 23 is shown the lighting device of the present invention as used transmission film in the case of image display device Top view.

Figure 24 is the side view for being shown with assembling the processing for the hologram recording medium that reference light creates reflection-type.

Figure 25 is shown with the reproduction processes of the hologram recording medium 45 of the reflection-type of the method establishment shown in Figure 24 Side view.

Figure 26 is the side view for being shown with assembling the processing for the hologram recording medium that reference light creates transmission-type.

Figure 27 is shown with the reproduction processes of the hologram recording medium 45 of the transmission-type of the method establishment shown in Figure 26 Side view.

Figure 28 is the side view for being shown with the preparation processing in the case that diverging reference light creates hologram recording medium.

Figure 29 is shown with the reproduction processes of the preparation hologram recording medium 95 of the preparation processing establishment of Figure 28 Side view.

Figure 30 is the side view for the processing for being shown with the hologram recording medium that diverging reference light creates reflection-type.

Figure 31 is the side view for the processing for being shown with the hologram recording medium that diverging reference light creates transmission-type.

Figure 32 is the side for being shown with another preparation processing in the case that diverging reference light creates hologram recording medium View.

Figure 33 is shown with the reproduction processes of the preparation hologram recording medium 95 of the preparation processing establishment of Figure 32 Side view.

Figure 34 is the inscape i.e. place of hologram recording medium for showing to create the lighting device of the variation of the present invention The configuration diagram of the optical system of reason.

Figure 35 is the side view formed substantially for the lighting device 110 for showing the variation of the present invention.

Figure 36 is the side view formed substantially for the lighting device 120 for showing another variation of the present invention.

Figure 37 is the side view for the operating principle for showing the lighting device 120 shown in Figure 36.

Embodiment

1. hologram recording mediums used in the present invention of §

First, the hologram record used as the inscape of the lighting device of one embodiment of the present invention is illustrated The feature of medium.Fig. 1 is the configuration diagram for showing to create the optical system of the processing of the hologram recording medium.Utilize the optical system System creates the hologram recording medium that record has the picture of scatter plate.

Coherent source 10 shown in the upper right of figure is the light source for producing coherent beam L10, in fact, being using section is produced The laser light source of circular one-wavelength laser (light).The devices 20 that are split of coherent beam L10 caused by the laser light source are divided into 2 beams. That is, a part of light beam L10 is directed through the lower section of optical splitter 20 and guiding figure, remaining part device 20 that is split is reflected and made The left of figure is oriented to for light beam L20.

The function for the object light Lobj for producing scatter plate can be realized through the light beam L10 of optical splitter 20.That is, toward the lower section of figure The light beam L10 of traveling is reflected as light beam L11 by speculum 11, further, parallel come enlarged diameter, composition by beam expander 12 Light beam L12, exposes to the whole region of the right flank of scatter plate 30.Scatter plate 30 is the property with the light scattering for making irradiation Plate, is commonly referred to as optical diffusing plate.In the case of embodiments illustrated here, it is used to make light scattering using being mixed with inside Fine particle (scattering object of light) transmission-type scatter plate (for example, opal glass plate).Therefore, as shown in the figure, exposing to scattered The collimated light beam L12 for penetrating the right flank of plate 30 passes through scatter plate 30, and is projected as scattering light L30 from left surface.The scattering light L30 forms the object light Lobj of scatter plate 30.

On the other hand, the light beam L20 of the device 20 that is split reflection can realize the function of producing reference light Lref.That is, from light splitting The light beam L20 that device 20 is advanced toward the left of figure is reflected as light beam L21 by speculum 21, then, is amplified directly by beam expander 22 Footpath, forms collimated light beam L22, hologram light-sensitive medium 40 is exposed to after being reflected by the convex lens 23 using point C as focus.In addition, Even if collimated light beam L22 is not necessarily the set of stringent parallel rays, as long as the set of almost parallel light, then practical to go up nothing Problem.Hologram light-sensitive medium 40 is the photonasty medium for recording hologram image.So far, shone to hologram light-sensitive medium 40 The irradiation light L23 penetrated forms reference light Lref.

As a result, hologram light-sensitive medium 40 is irradiated by the object light Lobj of scatter plate 30 and reference light Lref.Herein, thing Body light Lobj is all the coherent light with identical wavelength X produced by coherent source 10 (laser light source) with reference light Lref, because This, has both interference fringes in the record of hologram light-sensitive medium 40.In other words, in hologram light-sensitive medium 40, by scatter plate 30 picture is recorded as hologram.

Fig. 2 is position relationships of the section S1 with hologram light-sensitive medium 40 for showing the reference light L23 (Lref) shown in Fig. 1 Top view.There is circular section by the collimated light beam L22 of 22 enlarged diameter of beam expander, therefore, with 23 optically focused of convex lens Reference light Lref converges at the focus C using lens as the coniform of vertex.However, in the example shown in Fig. 1, photosensitive Jie of hologram Matter 40 is configured to the inclined of the opposite circular cone, therefore, by the surface cut-out reference light L23 of hologram light-sensitive medium 40 (Lref) section S1 obtained by becomes ellipse as shown in Figure 2.

As described above, in example shown in Fig. 2, reference light Lref only exposes to the whole region of hologram light-sensitive medium 40 In figure bend shown in region in, therefore, the hologram of scatter plate 30 becomes to be recorded only in and applies in the hatched example areas.When So, if producing the collimated light beam L22 of diameter bigger by beam expander 22, and using the convex lens 23 of diameter bigger, then such as Fig. 3 institutes The example shown, can also include hologram light-sensitive medium 40 in the section S2 of reference light Lref.In this case, as applied oblique line in figure As, the hologram of scatter plate 30 is recorded in the whole face of hologram light-sensitive medium 40.Creating the hologram record for the present invention Under the situation of medium, recorded with any form of Fig. 2, Fig. 3 and all may be used.

Then, the picture of further description scatter plate 30 is recorded in the optical treatment on hologram light-sensitive medium 40.Fig. 4 It is the magnified partial view in the optical system shown in Fig. 1 around scatter plate 30 and hologram light-sensitive medium 40.As described above, ginseng Irradiation Lref is to be formed the collimated light beam L22 optically focused with circular section with the convex lens 23 with focus C, is converged to Jiao Point C is the coniform of vertex.Therefore, below, this focus C is known as convergent point.Expose to the reference of hologram light-sensitive medium 40 Light L23 (Lref) is as shown in the figure, as converging at the light of convergent point C.

On the other hand, the light (object light Lobj) sent from scatter plate 30 is scattering light, therefore towards various directions.Example Such as, as shown in the figure, if it is considered that object point Q1 in the upper end of the left surface of scatter plate 30, then from object point Q1 to all the winds Project scattering light.Similarly, also scattering light is to all the winds projected from arbitrary object point Q2 or Q3.Therefore, if being conceived to complete The arbitrary point P1 in figure light-sensitive medium 40 is ceased, then records object light L31, L32, L33 and direction from object point Q1, Q2, Q3 The information of the interference fringe of the reference light Lref of convergent point C.Certainly, in fact, object point on scatter plate 30 not only Q1, Q2, Q3, therefore information quilt of the information of all objects point on scatter plate 30 equally as the interference fringe with reference light Lref Record.In other words, all information of scatter plate 30 are recorded in the point P1 of diagram.Moreover, similarly, also recorded in the point P2 of diagram All information of scatter plate 30.In this way, any portion in hologram light-sensitive medium 40 records all letters of scatter plate 30 Breath.This is the essence of hologram.

Then, below, the hologram light-sensitive medium 40 that record in this way is had to the information of scatter plate 30 is known as holography Seal recording medium 45.In order to reproduce hologram recording medium 45, to obtain the hologram reconstruction picture of scatter plate 30, as long as will with The coherent light of light phase co-wavelength in record is from direction corresponding with reference light Lref during record as reproduction illumination light Irradiation.

Fig. 5 is shown with the reproduction scatter plate of hologram recording medium 45 of the processing establishment shown in Fig. 4 as 35 The figure of processing.As shown in the figure, reproduction illumination light Lrep is irradiated from below to hologram recording medium 45.The reproduction illumination light Lrep is the coherent light dissipated from the point light source positioned at convergent point C as spherical wave, and one part zooms into coniform as shown And become the light of irradiation hologram recording medium 45 at the same time.Moreover, the reproduction is recorded with the wavelength of illumination light Lrep with hologram Wavelength (that is, the wavelength for the coherent light that the coherent source 10 shown in Fig. 1 produces) during the record of medium 45 is identical.

Herein, hologram sense of the hologram recording medium 45 shown in Fig. 5 shown in the position relationship and Fig. 4 of convergent point C Optical medium 40 is identical with the position relationship of convergent point C.Therefore, the reproduction shown in Fig. 5 is advanced with illumination light Lrep with reverse The light of the light path of reference light Rref shown in Fig. 4 corresponds to.If the reproduction for meeting this condition is exposed to entirely with illumination light Lrep Seal recording medium 45 is ceased, then the hologram reconstruction of scatter plate 30 is obtained as 35 (with dotted line in figure by its diffraction light L45 (Ldif) Display).Hologram light-sensitive medium of the hologram recording medium 45 shown in the position relationship and Fig. 4 of reproduction image 35 shown in Fig. 5 40 is identical with the position relationship of scatter plate 30.

As described above, the picture of arbitrary objects is recorded as hologram and makes its technology reproduced be all the time practical public affairs Know technology.Moreover, in the case where creating for general purpose hologram recording medium, reference light is used as using collimated light beam Lref.As long as using the hologram that the reference light Lref that is made of collimated light beam is recorded when reproducing also using by collimated light beam structure Into reproduction illumination light Lrep, therefore convenience is excellent.

If in contrast, as shown in figure 4, the light for being focused at convergent point C is used as reference light Lref, when reproducing, such as Shown in Fig. 5, it is necessary to which the light dissipated from convergent point C is used as reproduction illumination light Lrep.In fact, in order to obtain shown in Fig. 5 Illumination light Lrep is used in reproduction, it is necessary to by optical system configurations such as lens in specific location.If moreover, hologram record when reproducing Hologram light-sensitive medium 40 and the position relationship of convergent point C when the position relationship and record of medium 45 and convergent point C is inconsistent, Correct reproduction image 35 can not be then obtained, therefore, lighting condition when defining reproduction is (if situation about being reproduced using collimated light beam Under, as long as lighting condition irradiating angle meets).

For the above reasons, using the reference light Lref for the being focused at convergent point C hologram recording mediums created and discomfort In general service.Nevertheless, shown embodiment here, it will gather light in convergent point C as reference light Lref The reason is that the beam sweep carried out when making reproduction becomes easy.That is, in Fig. 5, for convenience of explanation, show use from convergent point C The method that the reproduction of diverging produces the reproduction image 35 of scatter plate 30 with illumination light Lrep, but in the present invention, in fact, without such as Diagram uses and zooms into reproduction of the coniform reproduction with illumination light Lrep.It is substituted, using the method for making beam sweep.With Under, describe the method in detail.

Fig. 6 is to show that only irradiating 1 light beam to the hologram recording medium 45 created with the processing shown in Fig. 4 makes scatter plate The figure for the processing that 30 picture 35 reproduces.I.e., in this embodiment, only by from convergent point C towards 1 light beam L61 of 1 point P1 in medium Given as reproduction with illumination light Lrep.Certainly, light beam L61 is with the coherent light with light phase co-wavelength during record.Such as Fig. 4 Illustrated, the arbitrary point P1 records in hologram recording medium 45 have the overall information of scatter plate 30.Therefore, if to Fig. 6's The position of point P1 condition corresponding with the reference light Lref with being used during record irradiates reproduction illumination light Lrep, then can be used only It is recorded in the reproduction image 35 that the interference fringe near point P1 produces scatter plate 30.Fig. 6 is shown by the diffraction from point P1 Light L45 (Ldif) makes the state after the reproduction of reproduction image 35.

On the other hand, Fig. 7 is only to be used from convergent point C towards 1 light beam L62 of another point P2 in medium as reproduction The example that illumination light Lrep gives.In this case, there is the overall information of scatter plate 30 in point P2 records, therefore, if the position to point P2 Condition irradiation reproduction illumination light Lrep corresponding with the reference light Lref with being used during record is put, then can be used only and be recorded in this Interference fringe near point P2 produces the reproduction image 35 of scatter plate 30.Fig. 7 is shown by the diffraction light L45 from point P2 (Ldif) state after the reproduction of reproduction image 35 is made.The reproduction image 35 shown in reproduction image 35 and Fig. 7 shown in Fig. 6 is with identical scattering Plate 30 is original image, therefore, in theory, forms the so-called identical reproduction image produced in same position.

Fig. 8 is the top view of the irradiation position of light beam in the reproduction processes shown shown in Fig. 6 and Fig. 7.The point P1 of Fig. 8 and figure 6 point P1 is corresponded to, and the point P2 of the point P2 and Fig. 7 of Fig. 8 are corresponding.A1, A2 represent the section of reproduction illumination light Lrep respectively.Section Form and dimension of the form and dimension of A1, A2 depending on the section of light beam L61, L62.Moreover, also depend on hologram record Irradiation position on medium 45.Wherein, though showing circular section A1, A2, for convenience, in fact, using with circle In the case of light beam L61, L62 of shape section, section shape becomes flat ellipse according to irradiation position.

As above-mentioned, the content of the interference fringe near the point P1 shown in Fig. 8 with being recorded respectively near point P2 is entirely different, But in the case of irradiating any point as light beam of the reproduction with illumination light Lrep, identical reproduction image is obtained in same position 35.The reason is that reproduction is with the light beam that illumination light Lrep is from convergent point C towards each point P1, P2, therefore any point is given Give the reproduction illumination light Lrep in direction corresponding with the direction of the reference light Lref during record shown in Fig. 4.

Though 2 point P1, P2 are only illustrated in Fig. 8, it is all identical certainly for the arbitrary point on hologram recording medium 45.Cause This, in the case of having irradiated light beam to the arbitrary point on hologram recording medium 45, as long as the light beam is from convergent point C's Light, then obtain identical reproduction image 35 in same position.But, as shown in Fig. 2, only in a part for hologram light-sensitive medium 40 Region (applying the region that shows of oblique line in figure) have recorded hologram in the case of, be only limitted to have the point irradiation in the region In the case of light beam, reproduction image 35 can be obtained.

As a result, hologram recording medium 45 described herein is used in the reference light that specific convergent point C is assembled The medium that Lref records the picture of scatter plate 30 as hologram, and if having and will be used as reproduction by the light beam of convergent point C The feature that optional position then produces the reproduction image 35 of scatter plate 30 is exposed to illumination light Lrep.Therefore, illuminated as reproduction Light Lrep, if making to strafe on hologram recording medium 45 by the light beam of convergent point C, passes through what is obtained from each irradiated site Diffraction light Ldif, identical reproduction image 35 are reproduced in same position.

The lighting device of the basic embodiment of the present invention of § 2.

Then, the side view with reference to Fig. 9 illustrates the composition of the lighting device 100 of the basic embodiment of the present invention.Such as figure Shown, which be made of hologram recording medium 45, coherent source 50, beam sweep device 60.

Wherein, hologram recording medium 45 is the medium with the feature described in § 1, and record has scatter plate 30 As 35.Moreover, light (object light Lobj and ginseng that coherent source 50 uses when being and producing with creating hologram recording medium 45 Irradiation Lref) same wavelength coherent beam L50 light source.

On the other hand, beam sweep device 60 is so that the light beam L50 that coherent source 50 produces strafes basic point B defined Bend and expose to hologram recording medium 45 and by making the bending state of light beam L50 change over time the light so that after bending The device that the mode that beam L60 changes over time the irradiation position of hologram recording medium 45 is strafed.Such device is general to make For strafe type mirror device (mirror device) and known device.In figure, for convenience of explanation, represented with chain-dotted line The bending state of moment t1, the bending state in moment t2 is represented with double dot dash line.That is, base is being strafed in moment t1, light beam L50 Point B is bent, and the point P (t1) of hologram recording medium 45 is exposed to as light beam L60 (t1), but in moment t2, light beam L50 conducts Light beam L60 (t2) after basic point B bendings are strafed exposes to the point P (t2) of hologram recording medium 45.

In figure, for convenience of explanation, the bending state at this 2 time points of moment t1, t2 is merely displayed in, but in fact, During moment t1~t2, the overbending direction of light beam is smoothly varying, irradiation positions of the light beam L60 to hologram recording medium 45 Slowly moved in a manner of P (t2) by from the point P (t1) in figure.That is, during moment t1~t2, the irradiation position of light beam L60 Strafed on hologram recording medium 45 by from point P (t1) in a manner of P (t2).

Wherein, if the position consistency of the position for making to strafe basic point B and the convergent point C shown in Fig. 4 are (in other words, if making Fig. 9's The position of hologram light-sensitive medium 40 and convergent point C is closed in hologram recording medium 45 and the position relationship and Fig. 4 of strafing basic point B It is identical), then in each irradiation position of hologram recording medium 45, light beam L60 is exposed to and Lref pairs of reference light shown in Fig. 4 The direction (direction of the light path of the reference light Rref shown in reverse traveling Fig. 4) answered.Therefore, light beam L60 is recorded in hologram and is situated between Each irradiation position of matter 45, work is played as the correct reproduction illumination light Lrep that the hologram is recorded in for reproducing With.

For example, in moment t1, the reproduction image 35 of scatter plate 30 is produced by the diffraction light L45 (t1) from point P (t1), Moment t2, the reproduction image 35 of scatter plate 30 is produced by the diffraction light L45 (t2) from point P (t2).Certainly, in moment t1~t2 Period, the reproduction image 35 of scatter plate 30 is similarly produced by the diffraction light for each position irradiated from light beam L60.That is, light beam L60, as long as from light of the basic point B to hologram recording medium 45 is strafed, then no matter light beam L60 exposes to hologram recording medium Any position on 45, by the diffraction light from irradiation position, identical reproduction image 35 is created on same position.

The reason for causing such a phenomenon be, as shown in figure 4, in hologram recording medium 45, using specifically The picture of scatter plate 30 is recorded as hologram by the reference light L23 that accumulation C is assembled, beam sweep device 60 using convergent point C as Strafe basic point B and carry out strafing for light beam 60.Certainly, even if stopping strafing for beam sweep device 60, by the irradiation position of light beam L60 1 point be fixed on hologram recording medium 45 is put, identical reproduction image 35 is still persistently produced in same position.Although such as This, it is in order to suppress speckle noise, without other reasons to strafe light beam 60.

Figure 10 is the side view for the state that the lighting device 100 being shown with shown in Fig. 9 illuminates lighting object thing 70.Illumination Device 100 is the device for using the reproduction light of the picture 35 of the scatter plate obtained from hologram recording medium 45 as illumination light. Wherein, in order to illuminate the left surface of lighting object thing 70 with lighting device 100, as shown in the figure, considering make lighting object thing 70 The left surface position consistent with the left surface of the reproduction image 35 of scatter plate be configured with the situation of lighting object thing 70.At this time, shine The left surface of bright object 70 becomes smooth surface R, and the diffraction light from hologram recording medium 45 exposes to smooth surface R.

Therefore, arbitrary starting point Q is set on smooth surface R, and what kind of the diffraction light for considering arrival starting point Q is Light.First, in moment t1, the light beam L50 projected from coherent source 50 is strafing basic point B bendings as shown in figure chain lines, and Point P (t1) is exposed to as light beam L60 (t1).Then, the diffraction light L45 (t1) from point P (t1) reaches starting point Q.It is another Aspect, in moment t2, the light beam L50 projected from coherent source 50, is strafing basic point B bendings as shown in double dot dash line in figure, is making Point P (t2) is exposed to for light beam L60 (t2).Then, the diffraction light L45 (t2) from point P (t2) reaches starting point Q.

As a result, diffraction light in this way, always produces with scatter plate 30 in the position of starting point Q starting point Q's The reproduction image of position correspondence, but it is different from moment t2 in moment t1 to the incidence angle of the diffraction light of starting point Q.In other words, sweeping In the case of having penetrated light beam L60, though the reproduction image 35 being formed on smooth surface R is constant, spreading out for each point on smooth surface R is reached The incident angle for penetrating light changes over time.Such incident angle is changed over time has very big tribute in terms of spot is reduced Offer.

As described above, the reason for being caused using coherent light and produced spot, is, in the coherent light that each portion of smooth surface R is reflected Interfered with each other because of its high interference.However, in the present invention, by strafing for light beam L60, diffraction light is to smooth surface R Each portion incident angle with time fluctuation, therefore interference mode has diversity also with time fluctuation.Accordingly, it is capable to make spot The main reason for generation, disperses in time, and mitigation is always frequently observed to physiologically causing dysgenic mottled decorative pattern Situation.This is the basic principle of the present invention.

Figure 11 is the side view for showing the lighting device 100 shown in Fig. 9 being used for an example of room lighting.As shown in the figure, Ground 200 indoors is configured with desk 75 and chair 76,77, and the upper surface of desk 75 becomes (in this example, the surface of tablecloth) Lighting object thing, forms smooth surface R.Lighting device 100, as shown in the figure, being installed on top surface 210.In figure for convenience of explanation, shine Bright device 100 be painted as it is in the same size with desk 75, if but in fact, being used as coherent source using semiconductor laser 50, using type mirror device is strafed as beam sweep device 60, then can minimize to the lighting device with general room lighting Same degree.

As coherent source 50, if such as green using green laser light source, the upper surface (smooth surface R) of desk 75 The lighting point irradiation of color.Use illumination and the existing general room lighting of such coherent light entirely different, to observer With extremely brand-new illuminating effect.That is, the monochromaticjty according to possessed by laser, smooth surface R is by extremely bright-coloured green illumination.And And the directionality according to possessed by laser, the lighting point with sharp boundary can be formed.In fact, due to being formed in smooth surface R Lighting point profile become reproduction image 35 profile, if therefore by smooth surface R configuration reproduction image 35 reproducing positions, Smooth surface R forms the distinct reproduction image of scatter plate 30.Furthermore since laser light source generally has high light conversion efficiency, The high illumination of brightness can be realized with low power consumption.

As above-mentioned, according to the present invention, the high monochromatic face illumination of excitation purity can be carried out.Moreover, in the illumination of the present invention In device, as noted previously, as the incident angle for being radiated at the light in each portion of smooth surface R is diversified with the time, therefore it can press down The generation of spot processed.Therefore, the mottled noise for the flicker observed in the illumination based on laser pointer can be reduced, will not The mankind are caused with sticky feeling physiologically.So, it can be achieved that the lighting device of room lighting can be sufficiently used for.

In addition, though Figure 11 is illustrated is producing the reproduction image of scatter plate 30 by lighting object thing (above desk 75) configuration 35 position, but in the case of as lighting device, the position of lighting object thing is not particularly limited.That is, shown in Figure 11 In the case of example, the reproduction image 35 of scatter plate 30 is produced in the upper surface (smooth surface R) of desk 75, therefore, smooth surface R is realized As display reproduction as the function of 35 screen, as described above, forming the lighting point with sharp boundary in smooth surface R.However, If being used only as lighting device, the lighting point with sharp boundary need not necessarily create.

For example, in the configuration shown in Figure 11, if removing desk 75, the diffraction light from hologram recording medium 45 shines It is incident upon ground 200.Even if in this case, since the generation position of reproduction image 35 is constant, eye-observation is less than reproduction image 35 (due to not making the object of light scattering in the position of reproduction image 35, reproduction image 35 will not be imaged on human eye).Nonetheless, The diffraction light for reaching ground 200 scatters on ground 200 and reaches human eye, therefore lighting device 100 can realize the photograph to ground 200 Bright function.

Certainly, the means of illumination that the position that can also use deliberately makes smooth surface R is deviateed from the generation position of reproduction image 35.Example Such as, if configuring the desk lower compared with the desk 75 shown in Figure 11, slightly hazy reproduction image 35 is formed on desk.So And if purpose is illumination table top surface, because forming fuzzy reproduction image 35, can to obtain soft illuminating effect anti-sometimes And preferable situation.As described above, in the case of using the lighting device of the present invention, the position of lighting object thing is according to hobby It is appropriate to determine, it is not particularly limited.

The detailed description in each portion of 3. lighting devices of §

Lighting device 100 shown in Fig. 9 is as described in § 2, by hologram recording medium 45, coherent source 50, beam sweep Device 60 is formed.Wherein, it is described in detail for these inscapes.

3-1. coherent source

First, as coherent source 50, the light (object light used when making with creating hologram recording medium 45 is used Lobj and reference light Lref) same wavelength coherent beam L50 produce light source.However, coherent source 50 produces The wavelength for the light that the wavelength of raw light beam L50 uses when need not be with creating hologram recording medium 45 is identical, as long as closely The reproduction image of hologram can be obtained like wavelength.Have and can reproduce in short, as long as the coherent source 50 that the present invention uses produces The light source of the coherent beam L50 of the wavelength of the picture 35 of scattering object.

In fact, the light source identical with the coherent source 10 shown in Fig. 5 can be directly used as coherent source 50.It is shown here Embodiment in, the DPSS (diode-pumped solids of the laser of wavelength X=532nm (green) can be projected：Diode Pumped Solid State) laser aid uses as coherent source 50.DPSS lasers are small-sized and can obtain at the same time higher The laser of the expectation wavelength of output, therefore apply to the coherent source of the lighting device of the present invention.

This DPSS laser aid, it is longer compared to general semiconductor laser coherence length, therefore spot is easily produced, with It is past to be considered not being suitable for illuminating.I.e., in the past, in order to reduce spot, the width increase for making the oscillation wavelength of laser is made great efforts, with to the greatest extent Coherence length may be shortened.In contrast, in the present invention, even if the light source grown using coherence length, can also be used above-mentioned principle Effectively suppress the generation of spot, therefore, even if as light source using DPSS laser aids, in practicality, generation spot is nor ask Topic.In this point, the effect of the invention that can then obtain the further range of choice of increase light source is utilized.

3-2. beam sweep devices

Beam sweep device 60 is the device for having the function of to make light beam strafe on hologram recording medium 45.Herein, Illustrate the specific method for the beam sweep that the beam sweep device 60 carries out.Figure 12 is in the lighting device 100 shown shown in Fig. 9 The top view of the 1st of the beam sweep mode on hologram recording medium 45.In this instance, as hologram recording medium 45, using width D a=12mm, the medium of height Db=10mm, as the light beam L60 strafed on this medium, using with diameter The laser beam of the circular section of 1mm.As shown in the figure, using following methods, i.e., strafe identical with electron beam in CRT, make light beam The irradiation position of L60 is strafed in the horizontal direction from the start region A1S of the 1st row to end region A1E, then, from opening for the 2nd row Beginning region A2S to end region A2E is strafed in the horizontal direction ... ..., finally, from the start region AnS of line n to end region AnE is strafed in the horizontal direction, again, returns to the start region A1S of the 1st row, repeatedly same operation.

In strafing in method shown in the Figure 12, the whole face of hologram recording medium 45 is strafed be subject to light beam, but this hair In bright, it is not necessarily intended to have no to strafe with omitting the whole face of hologram recording medium 45.For example, Figure 13 is only carried out shown in Figure 12 Strafe strafing for odd-numbered line in method and omit the example strafed of even number line.As described above, if interlacing is strafed, remember Reproduction of the hologram information to picture in a part of region of hologram recording medium 45 is recorded without any help, however Specific question will not be produced.Figure 14 is to show the more extreme example for strafing method, in the middle position of height Db, be repeated from Start region A1S to end region A1E only strafes the operation of a line in the horizontal direction.

Certainly, the setting for strafing direction be also it is free, the 1st row strafe from left to right carry out after, the 2nd row is strafed It can carry out from right to left.It is not limited to straight line moreover, strafing direction or picture is carried out on hologram recording medium 45 Round strafes.

In addition, in example as shown in Figure 2, a part of region (region for applying oblique line) only to hologram light-sensitive medium 40 The situation that irradiation reference light Lref is recorded, in other regions, (white space in outside) does not record hologram.At this time, if Reproduction image 35 can not then be obtained by strafing untill the white space in outside, therefore be illuminated temporarily dimmed.Therefore, in practicality, preferably Only have in record in the region of hologram and strafed.

As described above, light beam strafing on hologram recording medium 45 is carried out by beam sweep device 60.The light Beam, which is strafed device 60 and had, makes the light beam L50 from coherent source 50 to strafe the basic point B convergent point C of hologram while recording () curved Roll over and expose to the function of hologram recording medium 45.Moreover, by make the bending state (direction of bending and bending angle Size) change over time, so that so that the light beam L60 after bending changes over time the irradiation position of hologram recording medium 45 Mode strafe.Device with this kind of function is used in various optical systems as strafing type mirror device.

For example, in the example shown in Fig. 9, as beam sweep device 60, for convenience, only describe the figure of speculum, but it is actual On be to possess the driving mechanism for making the speculum be rotated in biaxially oriented.That is, basic point B will strafed it is being set in the speculum of diagram Reflecting surface center, and define and basic point B and the situation of V axis orthogonal on the reflecting surface and W axis strafed by this Under, possess the mechanism that makes the speculum be rotated around V axis (axis vertical with the paper of figure) and around W axis (with shown in dotted line in figure Axis) rotate mechanism.

If as described above, using the speculum that can be independently rotated around V axis and W axis, the light beam L60 after reflection can be in holography On seal recording medium 45 in the horizontal direction and vertical direction is strafed.For example, in said mechanism, if making reflected light be rotated around V axis, Then the irradiation position of light beam L60 can be made to strafe in the horizontal direction on the hologram recording medium 45 shown in Figure 12, if turning around W axis It is dynamic, then it can be strafed in vertical direction.

In short, if beam sweep device 60 in the plane for strafing basic point B with by a manner of comprising swing movement is carried out The function of bending light beam L60, then can be such that the irradiation position of light beam L60 is swept in one-dimensional square on hologram recording medium 45 Penetrate.Example as shown in figure 14, if applying flexibly into makes light beam be strafed only in horizontal direction, beam sweep device 60 have make It is enough in the function that one-dimensional square is strafed for the irradiation position of light beam on hologram recording medium 45.

On the other hand, if apply flexibly into makes the irradiation position of light beam L60 be swept in two-dimensional directional on hologram recording medium 45 Penetrate, then beam sweep device 60 is had to make light beam in a manner of comprising oscillating motion is carried out in the 1st plane for strafing basic point B (in Fig. 9, if making speculum be rotated around V axis, light beam L60 carries out swing fortune to the function of L60 bendings in the plane contained by paper It is dynamic) and by comprising strafe in basic point B and the 2nd plane orthogonal with the 1st plane carry out oscillating motion in a manner of make light beam L60 (in Fig. 9, if making speculum be rotated around W axis, light beam L60 carries out swing fortune to the function of bending in the plane vertical with paper It is dynamic).

As for making the irradiation position of light beam strafe type mirror device what one-dimensional square was strafed, polygonal mirror is by extensive profit With.Moreover, as strafing type mirror device what two-dimensional directional was strafed, 2 groups of polygonal mirrors can be applied in combination, it is known to universal The devices such as mirror (gimbal mirror), current mirror, MEMS (Micro Electro Mechanical System) mirror.Furthermore except common mirror device with Outside, total reflection prism, refracting prisms, photoelectric crystal (KTN (potassium tantalate-niobate) crystal etc.) also are used as beam sweep device 60.

If in addition, size of the diameter of light beam L60 close to hologram recording medium 45, the effect for suppressing spot is damaged, Therefore should be noted.Example shown in Figure 12~Figure 14, as described above, the width of hologram recording medium 45 for Da=12mm, Highly it is Db=10mm, light beam L60 is the laser beam of the circular section with diameter 1mm.If this size condition, then can fill The effect of spot must be suppressed by separately winning.This is because any region on hologram recording medium 45 is all only temporarily subject to light beam L60 Irradiation, will not persistently project diffraction light from same area.

However, for example, example shown in Figure 15, in diameter of the irradiation with the size close to hologram recording medium 45 In the case of light beam, the region (figure bend part) of lasting injection diffraction light can be formed.That is, even if the irradiation of light beam L60 is made Position is strafed in the horizontal direction from the start region A1S of the 1st row to end region A1E, drawn in figure the region a1 of oblique line always by To the irradiation of light beam.Similarly, even if being strafed in the horizontal direction from the start region AnS of line n to end region AnE, region A2 is always irradiated be subject to light beam.If moreover, considering strafing for vertical direction, for the start region of each row, region a3 becomes The region repeated, for the end region of each row, region a4 becomes the region repeated, therefore even if changes the row strafed, also always Irradiated be subject to light beam.

As a result, having drawn the region of oblique line on these, diffraction light is persistently projected, the benefit of beam sweep can not be obtained. As a result, from the smooth surface R that the diffraction light that such region is sent persistently injects lighting object thing with equal angular, become spot The main reason for point produces.Therefore, the diameter of light beam L60 should not arrive the size close to hologram recording medium 45 greatly.

Such a drawback, can also produce in the case of by the diameter for strafing spacing and being set smaller than light beam L60.For example, figure 12 be that the spacing of strafing of longitudinal direction is set to the example equal with the diameter of light beam L60, and Figure 13 is by between the strafing of longitudinal direction 2 times of the example away from the diameter for being set to light beam L60.If as described above, the spacing of strafing of longitudinal direction (pair strafes direction) is set Fixed into more than the diameter of light beam, then the swept area of the i-th row swept area capable with (i+1) does not repeat, if but strafing spacing The diameter of insufficient light beam, then produce repeat region, is likely to become the main reason for above-mentioned spot produces.

Moreover, strafe speed also becomes the main reason for spot produces slowly.For example, even if needs are strafed one hour with a line Jogging speed strafe, be equal to from the viewpoint of the temporal resolution in human vision and do not strafed, so as to recognize spotting out. By strafing light beam to reduce spot as described above, referring to the incident angle of the light in each portion because being radiated at smooth surface R with the time It is and diversified.Therefore, in order to fully obtain the effect that the spot based on beam sweep reduces, the reason for producing spot is become The time that identical interference fringe maintains is shorter than the temporal resolution in human vision.

In general, the limit of the temporal resolution in human vision is 1/20~1/30 second or so, if being carried in 1 second time Show static images more than 20~30 frame frames, then the mankind regard as the animation of smoothness.If considering this point, the diameter of light beam is being set In the case of for d, carried out with the speed (speed of second speed 20d~30d) of strafing in the distance of 1/20~1/30 second more than traveling d Strafe, then can obtain sufficient spot inhibition.

3-3. hologram recording medium

On hologram recording medium 45, illustrate detailed manufacture processing in § 1.That is, the hologram for the present invention records As long as medium 45 with use specific convergent point C assemble reference light using scatter plate 30 as hologram record The medium of feature.Therefore, the mode of the specific hologram recording medium described herein as being suitably employed in the present invention.

Hologram has multiple physical aspects (mode).Present inventor is thought in order to for the present invention, most preferably body Product type hologram.Particularly, it is most suitable for having used the volume hologram of photopolymer.

In general, it is used as false proof being referred to as surface undulation (relief) with the hologram of piece in cash card or cash certificate etc. Type hologram, the record of Fringes of A Hologram is carried out by the sag and swell on surface.Certainly, in addition to implementing the present invention, Can by the use of the picture of scatter plate 30 is recorded as surface-embossed holographic seal hologram recording medium 45 (in general, by Referred to as hologram diffusing globe (diffuser)).However, in the case of the surface-embossed holographic figure, due to the bumps on surface Scattering caused by construction is likely to become new spot and produces main cause, therefore not preferred from the viewpoint of spot is reduced. Moreover, in surface-embossed holographic figure, due to producing multiple diffraction light, diffraction efficiency reduces, furthermore, diffraction property (energy The angle of diffraction is set to increase to the performance of which kind of degree) also there is the limit.

On the other hand, in volume hologram, since the index distribution as media interior carries out hologram interference The record of striped, therefore will not be influenced be subject to the scattering caused by the sag and swell on surface.Moreover, in general, diffraction is imitated Rate or diffraction property are also excellent compared with surface-embossed holographic figure.Therefore, when implementing the present invention, the picture of scatter plate 30 is recorded as body The medium of product type hologram is most suitable for being used as hologram recording medium 45.

Even however, volume hologram, due to the type recorded using the light-sensitive medium containing silver salt material Scattering caused by middle silver salt particle is likely to become new spot and produces main cause, therefore preferably avoids.According to above-mentioned original Cause, the present inventors considered that as the hologram recording medium 45 utilized in the present invention, it is generally desirable to used photopolymer Volume hologram.The specific chemical composition of the above-mentioned volume hologram for having used photopolymer is disclosed in for example that Japan is specially Sharp No. 2849021 publication.

It is however, excellent compared with volume hologram for the point of production, surface-embossed holographic figure.Surface-embossed holographic Figure, has the master of sag and swell, the pressure processing exercised and used the master of going forward side by side, thus allows for being situated between by creating surface The volume production of matter.Therefore, in the case where manufacture cost must be reduced, surface-embossed holographic figure is utilized.

Moreover, the physical aspect as hologram, have recorded the amplitude of interference fringe as gradation pattern in the plane Modulation type hologram is also widely spread.However, this Modulation and Amplitude Modulation type hologram is since diffraction efficiency is low and with dense pattern Part carries out the absorption of light, when thus be accordingly used in the present invention, can not ensure sufficient illumination efficiency.But in the manufacturing process, by In the easy method of printing gradation pattern in the plane can be used, therefore there is advantage being manufactured into present aspect.Therefore, according to On the way, the present invention can also use Modulation and Amplitude Modulation type hologram.

In addition, in recording method shown in Fig. 1, though creating the hologram recording medium of so-called Fresnel type, also may be used Scatter plate 30 is recorded and the hologram recording medium of the Fourier transform type of acquisition using by lens to create.At this time, root According to needs, lens can also be set to carry out optically focused in the light path of diffraction light L45, to lift illumination efficiency, even if without lens Also the function as lighting device can be fully realized.

The variation of the lighting device of the present invention of § 4.

So far, for basic embodiment, lighting device of the invention is illustrated.When implementing the basic embodiment, First, carry out by by scatter plate 30 as 35 are used as hologram and are recorded on recording medium 40 and create hologram recording medium 45 preparation stage, is used the hologram recording medium 45 created in the preparation stage to form lighting device 100 with right The mode irradiated coherent beam L60 on hologram recording medium 45 and change over time irradiation position makes light beam L60 in holography The illumination phase strafed on seal recording medium 45.

At this time, in the preparation stage, as shown in Figure 1, the illumination light L12 relevant to the irradiation of scatter plate 30, will be from scatter plate 30 The scattering light L30 of acquisition is used as object light Lobj.Moreover, along regulation light path irradiation recording medium 40, will be with illumination light L12 phases The coherent light L23 of co-wavelength is used as reference light Lref.Then, the interference fringe that will be formed by object light Lobj and reference light Lref Recording medium 40 is recorded in, so as to create hologram recording medium 45.Moreover, in illumination phase, as shown in figure 9, with ginseng The light beam L60 of irradiation Lref phases co-wavelength (or can make the approximate wavelength of hologram reconstruction) passes through the light along reference light Lref light paths Road and mode towards the irradiation position on hologram recording medium 45 strafed (in other words, from reference light Lref optics Give light beam L60 in the direction of conjugation), using from hologram recording medium 45 is obtaining, reproduction light of the picture of scatter plate 30 35 as Illumination light.

Herein, several variations for above-mentioned basic embodiment are illustrated.

Hologram recording mediums of the 4-1. premised on one-dimensional strafe

In the establishment processing of the hologram recording medium shown in Fig. 1, (have by convex lens 23 in the position of convergent point C Focal lens) make collimated light beam L22 optically focused, and expose to medium 40 as reference light Lref.That is, along using convergent point C as The side of the circular cone (in theory, radius circular cone different from each other infinitely exists) on vertex, the ginseng of convergent point C is focused at using three-dimensional Irradiation Lref records the picture of scatter plate 30.

As described above, using three-dimensional assemble reference light Lref the reason for be, in the lighting device shown in Fig. 9, be Obtain from the light path for strafing the three-dimensional divergings of basic point B so that light beam L60 three-dimensionals strafe (rotation around V axis of facetted mirrors with Rotation around W axis makes beam sweep) premised on.In addition, it is to make on hologram recording medium 45 to strafe light beam L60 three-dimensionals The irradiation position two dimension of light beam strafe (in Figure 12, to carry out strafing for transverse direction and strafing for longitudinal direction).

However, the irradiation position for the light beam strafed on hologram recording medium 45 is not necessarily intended to two-dimensionally carry out.For example, figure 14 be to show the example for making light beam strafe only in horizontal direction.If in this way, so that the irradiation position of light beam is one-dimensional strafe premised on, It is rational that then hologram recording medium is also created with such premise.Specifically, if premised on one-dimensional strafe, instead of The hologram recording medium 45 shown in Figure 14 is created, as long as it is enough for the hologram recording medium 85 of the banding shown in establishment Figure 16.

In the case of having used the hologram recording medium 85, as long as beam sweep device 60 is strafed repeatedly from left end The land A1E of starting area A1S to right end strafes the amount of 1 row.At this time it is also possible to strafe 1 row from left to right repeatedly Amount, turn left the reciprocating motion strafed from the right side again after can also being strafed from left to right.It is to have directly in the light beam L60 used In the case of the laser beam of the circular section of footpath 1mm, make the height Db=1mm i.e. foot of the hologram recording medium 85 shown in Figure 16 .Therefore, compared with using the situation of the hologram recording medium 45 shown in Figure 14, it can seek to save space, device can be made whole Body minimizes.

Although such hologram recording medium 85 premised on one-dimensional strafe can use the optical system shown in Fig. 1 To create, but can also be created instead of it using the optical system shown in Figure 17.In optical system shown in the Figure 17, it will scheme Convex lens 23 replaces with cylindrical lens 24 in optical system shown in 1, and by the hologram light-sensitive medium 40 with rectangle plane The hologram light-sensitive medium 80 with elongated, belt-shaped plane is replaced with, other inscapes are then constant.Hologram light-sensitive medium 80 Width D a and hologram light-sensitive medium 40 be of same size, but its height Db (in Figure 17 with the width of paper vertical direction) is The degree of the diameter of light beam (in the case of upper example, 1mm or so).

Cylindrical lens 24 is the lens for carrying the periphery with the central shaft vertical with the paper of Figure 17, and in Figure 17 Defined in by convergent point C and the optically focused axis vertical with paper, at this time, it can be achieved that by collimated light beam L22 optically focused in the optically focused The function of axis.However, consider that the refraction of light only produces in the plane parallel with paper, Bu Huifa from the property of cylindrical lens The raw refraction to the direction vertical with paper.In other words, if be conceived to comprising convergent point C and with the center of the cylinder of cylindrical lens The orthogonal plane of axis (paper of Figure 17), then the light L24 assembled along the planar are given as reference light Lref.

As described above, when referring to " light is assembled in convergent point C " in the application, refer not only to convex shown in the optical system of Fig. 1 The three-dimensional convergence of lens 23, also refers to the two dimension convergence of the cylindrical lens 24 shown in the optical system of Figure 17.In addition, create Figure 16 examples During the hologram recording medium 85 premised on one-dimensional strafe shown, as shown in the optical system of Figure 17, can also use carry In parallel with the specified optically focused axis (in the case of legend, passing through convergent point C and the axis vertical with paper) by convergent point C The cylindrical lens 24 on the cylindrical surface of mandrel by the light beam L22 optically focused of almost parallel coherent light on the optically focused axis, by two-dimentional meeting Gather and be used as reference light Lref in the light L24 of convergent point C, record the hologram image of scatter plate 30.

4-2. includes the hologram recording medium of CGH

So far it is stated that hologram recording medium establishment processing be practically to hologram light-sensitive medium irradiation light simultaneously The pure optical means of this caused interference fringe will be fixed by the chemical change of light-sensitive medium.On the other hand, most Closely, establishing has and simulates such a optical treatment on computers, and the information of interference fringe is calculated and with certain thing by computing Its result is fixed on the method on medium by reason method.It is complete that the hologram created in this way is commonly referred to as computer synthesis Breath figure (CGH：Computer Generated Hologram).

The hologram for being recorded in hologram recording medium used in the present invention can be such computer synthetic hologram Figure.That is, it can also substitute and create hologram recording medium with the optical treatment described in § 1, execution, which has used, comes from imaginary scattering The simulation trial of the imaginary object light of plate and imaginary reference light, obtains the information of the interference fringe produced on imaginary recording surface, And be recorded in this information on medium with physical method, to create calculator resultant hologram.

Figure 18 is the inscape i.e. hologram recording medium for showing to be created the lighting device of the present invention with the method for CGH The side view of principle, the method for showing the optical phenomena shown in simulation drawing 4 on computers.Herein, it is imaginary scattered shown in Figure 18 Penetrate that plate 30 ' is corresponding with the real scatter plate 30 shown in Fig. 4, the imaginary recording surface 40 ' shown in Figure 18 with it is true shown in Fig. 4 Hologram light-sensitive medium 40 correspond to.The object light Lobj of diagram is the imaginary light sent from imaginary scattering object 30 ', it is illustrated that Reference light Lref be imaginary light with object light Lobj phase co-wavelengths.Reference light Lref be convergent point C assemble light this It is a little identical with the method described so far.To each point on recording surface 40 ', the computing imaginary object light Lobj With the information of the interference fringe of reference light Lref.

In addition, as imaginary scatter plate 30 ', such as, it is possible to use with the trickle 3D shape of the performances such as polyhedron Model, but it is used herein as in the plane being arranged in multiple point light source D the simple model of clathrate.Figure 19 is shown in Figure 18 The front view of imaginary scatter plate 30 ', small (white) circle represent point light source D respectively.As shown in the figure, multiple point light source D are with transverse direction Spacing Pa, longitudinal direction spacing Pb are arranged in clathrate.Spacing Pa, Pb is to determine the parameter of the surface roughness of scatter plate.

The size that spacing Pa, Pb of point light source D is set to 10 μm or so by present inventor is being recorded with computing The information of the interference fringe produced on face 40 ', according to as a result, in real dielectric surface formation relief pattern, creates table The CGH of face relief type.Then, the lighting device 100 that the CGH is used as to hologram recording medium 45 is constituted, obtains and suppresses spot The good illumination environment of point.

Figure 20 is the table for showing to utilize the experimental result present invention obtains spot reducing effect.Generally, as table Show the parameter for the degree that spot is produced on smooth surface, proposition has using referred to as speckle contrast's (unit：The method of numerical value %). The speckle contrast is defined as the standard of the luminance deviation actually produced under conditions of it should realize uniform luminance distribution The amount being worth obtained by deviation divided by the average value of brightness.The value of the speckle contrast means that more greatly the spot on smooth surface produces journey Degree is bigger, and for observer, mottled brightness disproportionation pattern is more notable.

Figure 20's representing for the lighting device 100 utilized shown in Figure 10 or being illuminated for existing apparatus in contrast 4 kinds of measurement systems of lighting object thing 70, the result of the speckle contrast of measure smooth surface R.It is to project to measure example 1~3 The identical DPSS laser aids of green laser are used as the result of coherent source 50.In addition, hologram recording used in measure example 2,3 The angle of flare (maximum angle to reproduction image 35 is hoped from the point on hologram recording medium) of recording medium is all provided with any circumstance Determine into 20 °.

First, the measurement result measured shown in example 1 is to put the light beam L50 from coherent source 50 using using beam expander It is big to be substituted as collimated light beam and by the measurement system of collimated light beam (parallel laser light) direct irradiation to smooth surface R using photograph Bright device 100, the result of gained.In this case, it is as shown in the table, the result that speckle contrast is 20.1% is obtained.This is that naked eyes are seen When examining can highly significant observe the state of mottled brightness disproportionation pattern, be unsuitable for practicality room lighting etc. Level.

On the other hand, the measurement result measured shown in example 2 and 3 is to be shone using the lighting device 100 shown in Figure 10 Bright result.Herein, it is to be used as hologram recording medium 45 by the use of using the volume hologram that optical means creates to measure example 2 As a result, measure example 3 is the result by the use of above-mentioned surface relief type CGH as hologram recording medium 45.Obtain less than 4% Speckle contrast, this is the extremely good state that brightness disproportionation pattern is barely perceivable when visually observing (if in general, spot Reduced value is less than 5%, then observer will not produce not pleasant feeling).Therefore, as hologram recording medium 45, make use of with The situation for the volume hologram that optical means creates is with make use of the situation of surface relief type CGH to may make up abundant practicality Lighting device.The reason for result (3.0%) of measure example 2 is more preferable than the result (3.7%) of measure example 3 is regarded as artwork As real scatter plate 30 the imaginary scatter plate 30 ' of resolution ratio (aggregate of the point light source shown in Figure 19) resolution ratio It is high.

Measurement result shown in last measure example 4 be use by from green LED light source light direct irradiation to by The measurement system of smooth surface R substitutes and uses lighting device 100, the result of gained.Due to script LED light source and incoherent light source, because This is not required to consider the problem of spot produces, and it is as shown in the table, obtains the good result that speckle contrast is 4.0%.Use incoherent The reason for result of the measure example 4 of light is poor compared with the result for the measure example 2,3 for having used coherent light is regarded as because LED light source is sent out The trimmed book body gone out produces brightness disproportionation.

The illumination of the more a colors of 4-3.

The embodiment illustrated so far is the monochromatic illumination for using monochromatic laser light source as coherent source The example of device, if but using more laser light sources for producing the laser with respectively different wavelength, can form to be closed Into the lighting device of the illumination of multiple colors.

Specifically, in the lighting device 100 shown in Fig. 9, can use with producing difference as coherent source 50 More (n platforms) laser light sources of the monochromatic laser beam with different wave length and the laser beam produced to this n platforms laser light source Synthesized to produce the device for the light synthesizer for synthesizing light beam.Certainly, in hologram recording medium 45, in advance to pass through n Each laser beam that platform laser light source produces obtains the mode of reproduction image using the picture 35 of scatter plate 30 as n kind hologram recordings respectively Record.

Figure 21 is the composition figure for an example for showing such a device.The device have by the synthesis of 3 primary colors of red, green, blue so as to Produce the function of white light beam.That is, the red produced with 15 couples of red laser light source 50R of dichroic prism (dichroic prism) The green laser beam L (G) that laser beam L (R) and green laser light source 50G is produced is synthesized, then, right again with dichroic prism 16 The blue laser beam L (B) that blue laser light source 50B is produced is synthesized, so as to produce the synthesis light beam L (R, G, B) of white. On the other hand, the synthesis light beam L (R, G, B) that beam sweep device 60 makes to produce in this way is bent and in hologram recording medium Strafed on 45.Assorted component from hologram recording medium 45 for R, G, B obtains diffraction light respectively, is produced in same position The reproduction image 35 of the raw assorted component for R, G, B, obtains white reproduction image.

In addition, in order to there is the hologram recording medium of the picture of scatter plate 30 using the light of tri- kinds of colors of R, G, B establishment record, For example, it may be used photosensitive dyestuff (pigment), photosensitive dyestuff, the photosensitive dyestuff into B coloured light into G coloured light into R coloured light The processing of the hologram light-sensitive medium being similarly distributed and above-mentioned synthesis light beam L (R, G, B) record hologram.Furthermore, it is possible to make With comprising being laminated with photosensitive the 1st photosensitive layer into R coloured light, photosensitive the 2nd photosensitive layer into G coloured light, photosensitive the 3rd sense into B coloured light The hologram light-sensitive medium of 3 layers of construction of photosphere.Alternatively, can also prepare above-mentioned 3 photosensitive layers as different medium, The record of hologram is carried out respectively using the light of corresponding color, finally, this 3 layers fitting is formed and have the construction that haves three layers Hologram recording medium.

4-4. image display device

So far, the mode that the present invention is used as to lighting device is illustrated, but the lighting device of the present invention also is used as Image display device.There is the upper surface that desk 75 is illuminated by being arranged on the lighting device 100 of ceiling for example, Figure 11 is example Occupation mode.At this time, the reproduction image 35 of scatter plate 30 is formed in smooth surface R, and lighting point is formed using reproduction image 35.

As can seen above, if lighting device 100 to be considered as to the device for the reproduction image 35 for producing scatter plate 30, which possesses Function as image display device.For example, in the case of having used rectangular slab as the scatter plate 30 recorded in the preparation stage, Though being formed in the profile of the lighting point of the upper surface of desk 75 becomes rectangle, in the case where having used circular slab, lighting point Profile become circle.Thus, for example, as shown in figure 22, if the use of profile being star-like scatter plate 30A or profile is cardioid Scatter plate 30B is made hologram recording medium 45, then can obtain the lighting point with star-like or cardioid contour shape.This meaning , lighting device 100 plays a role as the image display device for showing star-like image or cardioid image.

However, the pattern of the image as display object, is not only determined by the contour shape of scatter plate.For example, as schemed Shown in 23 upper part, prepare common rectangular diffusion plate 30, and as shown in the lower left quarter of Figure 23, star-like image is decorated with preparation Transmission film 33A.Transmission film 33A has the property of star-like inside printing opacity but star-like outside (hatched example areas) shading.Should Kind transmission film 33A is overlapping to be covered in above scatter plate 30 and is recorded with the optical system shown in Fig. 1, then becomes and use The situation that contour shape shown in Figure 22 is star-like scatter plate 30A similarly records star-like scatter plate, therefore, when reproducing Star-like lighting point can be obtained.

Certainly, as shown in the lower central of Figure 23, if using the transmission film 33B for being decorated with " PAT " character string, can be had The lighting point of each character shape.In the case of occupation mode shown in Figure 11, emerge character string in the upper surface of desk 75 “PAT”.Furthermore as shown in the right lower quadrant of Figure 23, if using the gray scale image (for example, black-and-white photograph) being printed with deep or light information Transmission film 33C, then also can the upper surface of desk 75 show gray scale image.

As described above, in the case of as image display device, in order to show the image of distinctness, it is necessary to by smooth surface R Configuration is in the generation position of reproduction image 35.Therefore, it can show that the image display of the image shown in the lower part of Figure 23 fills to form Put, following compositions can be taken, that is, prepare the lighting device 100 of described above and with the illumination for receiving the lighting device 100 The display medium 70 of smooth surface R, and the pre-recorded transmission film covering for being decorated with specified image in hologram recording medium 45 Scatter plate 30 picture 35, by smooth surface R configuration formed scatter plate 30 reproduction image 35 position.

The geometry diversity that 4-5. hologram recording mediums create

In § 1., illustrate for the hologram image of scatter plate 30 to be recorded in the side of hologram light-sensitive medium 40 with reference to Fig. 1 Method.This method is using the method for the reference light establishment reflection hologram recording medium for being focused at convergent point C, necessary composition The geometry of key element is configured as shown in the side view of Figure 24.

In the case of example shown in Figure 24, the convergence reference light Lref towards convergent point C, medium are produced by convex lens 23 40 configurations are between convex lens 23 and convergent point C.Moreover, medium 40 as schemed obliquely to configure, comes from the irradiation of its lower face side The object light Lobj of scatter plate 30.The hologram recording medium created in this manner becomes the medium of reflection-type.That is, reproducing When, as shown in figure 25, the light beam to play a role as reproduction illumination light Lrep exposes to the lower face side of medium 45, passes through Reflection diffracting light Ldif generation reproduction images 35 from point P.

As described above, the hologram that the example illustrated so far is recorded in hologram recording medium 45 is reflection-type Hologram and the example that the reflection diffracting light of light beam is used as to illumination light.On the other hand, can also make to be recorded in hologram record The transmission diffraction light of light beam for transmission-type hologram and is used as illumination light by the hologram of medium 45.

Figure 26 is the side view for showing to create the geometry configuration in the case of such transmission-type hologram.With Figure 24 institutes The difference for the configuration shown is the direction of medium 40.In the creation method of the reflection hologram shown in Figure 24, from medium Above irradiate reference light Lref, and object light Lobj is irradiated below medium.If in this way, reference light and object light are irradiated To the face of opposite side, then the hologram of reflection-type can be recorded.On the other hand, in the method shown in Figure 26, reference light Lref and thing Both of body light Lobj are irradiated to the upper surface of medium 40.In this way, if reference light and object light are irradiated in this wise from same side The hologram of transmission-type can then be recorded.That is, when reproducing, as shown in figure 27, play a role as reproduction illumination light Lrep Light beam expose to the lower face side of medium 45, pass through the transmission diffraction light Ldif from point P and produce reproduction image 35.

Moreover, the example so far illustrated is to create reflection-type or transmission-type using the reference light for being focused at convergent point C The method of hologram recording medium, but it can also be substituted and create reflection-type or transmission using the reference light from convergent point C divergings The hologram recording medium of type.However, preparation hologram recording medium must be pre-created for this.Hereinafter, sequentially explanation is used In the processing for carrying out this method.

First, as shown in figure 28, configure preparation hologram light-sensitive medium 90 and scatter plate 30, to medium 90 such as icon from The parallel reference light Lref of right tiltedly upper irradiation.Then, will be produced using the object light Lobj from scatter plate 30 and reference light Lref Raw interference fringe recorded medium 90.As described above, in record, can if irradiating object light and reference light from same side Record the hologram of transmission-type.Herein, the medium 90 for having carried out this record is known as preparation hologram recording medium 95.

Figure 29 is the side view for the reproduction processes for showing the preparation hologram recording medium 95.As shown in the figure, to medium 95 irradiate parallel reproduction illumination light Lrep obliquely downward from a left side, then produce reproduction image in the right of figure by transmission diffraction light Ldif 35.Herein, reproduction is the side consistent with the direction of the reference light Lref shown in Figure 28 with the extended line in the direction of illumination light Lrep To the generation position of reproduction image 35 is consistent with the allocation position of the scatter plate 30 shown in Figure 28.

Then, the preparation reproduction image 35 of hologram recording medium 95 is replaced into scatter plate 30 in kind, carried out to holography Figure light-sensitive medium 40 records the processing of the picture of scatter plate 30.I.e., as shown in figure 30, the right side in preparation with hologram recording medium 95 Side configuration hologram light-sensitive medium 40, irradiates parallel reproduction illumination light Lrep, on the right side of figure obliquely downward to medium 95 from a left side Produce reproduction image 35.At this time, the light projected to the right from medium 95 be to make the transmission diffraction light Ldif that reproduction image 35 reproduces, The function as object light Lobj is realized to medium 40 at the same time.

On the other hand, from the lower direction medium 40 irradiation diverging reference light Lref of figure.Diverging reference light Lref is from meeting The light (light sent in the case where convergent point C is there are point light source from the point light source) of accumulation C divergings, irradiates circular cone to medium 40 The light beam of shape diffusion.In the example of diagram, by having focal convex lens 25 in the position of convergent point C, make collimated light beam L10 Convergent point C is focused at, produces point light source, to produce diverging reference light Lref.As convex lens 25, if for example, using diameter 1mm The lenticule of degree, then can be directly used as collimated light beam L10 by the laser beam of the section footpath 1mm degree sent from laser light source, Produce diverging reference light Lref.

In the method shown in Figure 30, object light Lobj exposes to the upper surface of medium 40, and reference light Lref exposes to Jie The lower surface of matter 40.If in this way, reference light to be exposed to the face of opposite side with object light, the hologram of reflection-type can be recorded. Therefore, with shown in Figure 30 method create hologram recording medium 45 become substantially with shown in Figure 24 method create The identical reflection hologram of hologram recording medium 45.Therefore, when reproducing, the geometry shown in Figure 25 can be used to match somebody with somebody Put.

On the other hand, Figure 31 is the side view for being shown with the example that diverging reference light Lref creates transmission-type hologram. Difference with the configuration shown in Figure 30 is the direction of medium 40.In the creation method of the reflection hologram shown in Figure 30, Object light Lobj is irradiated above medium, reference light Lref is irradiated below medium.On the other hand, in the side shown in Figure 31 In method, the lower surface for being both irradiated to medium 40 of object light Lobj and reference light Lref.If in this way, irradiate reference from homonymy Light and object light, then can record the hologram of transmission-type.The hologram recording medium 45 created with the method shown in Figure 31 becomes The substantially transmission-type hologram identical with the hologram recording medium 45 created with the method shown in Figure 26.Therefore, reproducing When, configured using the geometry shown in Figure 27.

In addition, shown in Figure 30 and Figure 31 record processing in, though as preparation with 95 use of hologram recording medium with The transmission-type hologram that method shown in Figure 28 creates, but can also be used with Figure 32 as preparation hologram recording medium 95 The reflection hologram that shown method creates.In the method shown in Figure 32, the left side from preparation with hologram light-sensitive medium 90 Reference light Lref is irradiated in side, irradiates object light Lobj from right side, and therefore, the preparation of establishment becomes anti-with hologram recording medium 95 Emitting hologram.

In the case of being reproduced using the preparation of the reflection-type with hologram recording medium 95, as shown in figure 33, from Jie The right side irradiation reproduction illumination light Lrep of matter 95, reproduction image 35 is produced by the reflection diffracting light Ldif of acquisition.Therefore, scheming In processing shown in 30 and Figure 31, substitute from left side and irradiate reproduction illumination light Lrep, but irradiated from right side.

Moving in parallel for 4-6. light beams is strafed

In the embodiment so far illustrated, though strafe basic point B using beam sweep device 60 and bend light beam specifying, The bending state (direction of bending and the size of bending angle) is changed over time, so that the mode of the light beam of bending is strafed, But beam sweep device 60 strafes method, however it is not limited to makes light beam in the method for strafing basic point B bendings.

For example, can also it use move in parallel light beam to strafe method.However, at this time, it is also desirable to which change is to hologram recording The recording method of the scatter plate 30 of recording medium 45.That is, example as shown in figure 34 is such, hologram light-sensitive medium 40 is irradiated by The reference light Lref that collimated light beam is formed, record and the information of the interference fringe of the object light Lobj from scatter plate 30.Change speech It, in the hologram recording medium 46 so created, using the reference light Lref being made of collimated light beam by scatter plate 30 Recorded as 35 as hologram.

Figure 35 is the side view for the lighting device 110 for having used the hologram recording medium 46 created with the method shown in Figure 34 Figure.As shown in the figure, the lighting device 110 is made of hologram recording medium 46, coherent source 50, beam sweep device 65.

Herein, hologram recording medium 46 is the medium created with the method shown in Figure 34, is formed using by collimated light beam Reference light Lref scatter plate 30 is recorded as hologram as 35.Moreover, coherent source 50 has with creating holography to produce The light (object light Lobj and reference light Lref) used during seal recording medium 46 same wavelength (or, hologram can be reproduced Approximate wavelength) coherent beam L50 light source.

On the other hand, though beam sweep device 65 exposes to hologram recording with the light beam L50 for producing coherent source 50 The function of recording medium 46, but at this time, to be incited somebody to action from the parallel directions of the reference light Lref with being used in the establishment processing shown in Figure 34 The mode that light beam L65 exposes to hologram recording medium 45 is strafed.More specifically, moving in parallel light beam L65 Hologram recording medium 46 is exposed at the same time, so as to become with light beam L65 to the irradiation position of hologram recording medium 46 with the time The mode of change is strafed.

This beam sweep device 65 strafed is carried out, for example, by moving reflector 66 and the moving reflector can be driven 66 driving mechanism is formed.I.e., as shown in figure 35, the position configuration of the light beam L50 of the generation of coherent source 50 can received Moving reflector 66, and the driving mechanism for setting the optical axis for making this moving reflector 66 along light beam L50 to slide.In addition, in practicality, The beam sweep device 65 having the function of with above-mentioned identical function can be formed by using the micro mirror element of MEMS.Or Person, the light beam L60 for making to be bent in the position for strafing basic point B by the beam sweep device 60 shown in Fig. 9 is by sweeping Penetrate basic point B and have focal convex lens, can also produce the light beam moved in parallel.

In the case of example shown in Figure 35, the hologram of the irradiation of the light beam L65 reflected by moving reflector 66 is received Recording medium 46 produces diffraction light according to the interference fringe of record, and the reproduction image 35 of scatter plate 30 is produced by the diffraction light. The illumination that reproduces light be used as illumination light of the lighting device 110 into the reproduction image 35 for being about to so obtain.

In Figure 35, for convenience of description, the position of the light beam of moment t1 is represented with chain-dotted line, moment t2 is represented with double dot dash line Light beam position.That is, reflected in moment t1, light beam L50 in the position of moving reflector 66 (t1), and as light beam L65 (t1) the point P (t1) of hologram recording medium 46 is exposed to, but in moment t2, light beam L50 is in the position of moving reflector 66 (t2) Reflection (moving reflector 66 (t2) of diagram is the situation after moving reflector 66 (t1) movement) is put, and as light beam L65 (t2) the point P (t2) of hologram recording medium 46 is exposed to.

In figure, for convenience of explanation, only show that two time points of moment t1, t2 strafe mode, but in fact, moment During t1~t2, light beam L65 is moved in parallel in the left and right of figure, and light beam L65 is to the irradiation position of hologram recording medium 46 from figure Point P (t1) it is slowly mobile to P (t2).That is, during moment t1~t2, the irradiation position of light beam L65 is recorded in hologram to be situated between Strafed in matter 46 from point P (t1) to P (t2).Herein, though understanding makes light beam L65 parallel in one-dimensional square (left and right directions of figure) Mobile example, but certainly, if set light beam L65 is also moved in parallel in the direction vertical with the paper of figure mechanism (for example, The mechanism of speculum is configured on XY microscope carriers), then it can be made to be moved in parallel in two-dimensional directional.

Herein, light beam L65 is with side always parallel with the reference light Lref used in the establishment processing shown in Figure 34 Formula is strafed, and therefore, in each irradiation position of hologram recording medium 46, light beam L65 is recorded in this holography as reproducing The correct reproduction illumination light Lrep of figure and play a role.

For example, in moment t1, the reproduction image 35 of scatter plate 30 is produced by the diffraction light L46 (t1) from point P (t1), Moment t2, the reproduction image 35 of scatter plate 30 is produced by the diffraction light L46 (t2) from point P (t2).Certainly, in moment t1~t2 During, the reproduction image 35 of scatter plate 30 is similarly produced also by the diffraction light for each position irradiated from light beam L65. That is, as long as light beam L65 undertakes to move in parallel and strafes, then no matter light beam L65 exposes to any position on hologram recording medium 46 Put, can be transferred through the diffraction light from irradiation position and identical reproduction image 35 is produced in same position.

, can be into being about to reproduce as a result, the lighting device 110 shown in the Figure 35 is in the same manner as the lighting device 100 shown in Fig. 9 As 35 illumination for reproducing light and being used as illumination light.In short, in the present invention, in hologram recording medium, light path is provided using edge The picture of scatter plate is recorded as hologram by the reference light of irradiation, and the hologram is recorded with light beam by beam sweep device and is situated between The direction of illumination of matter is to carry out strafing for light beam along the mode in the direction (optical conjugate direction) of the light path of reference light.

The utilization of 4-7. microlens arrays

So far the embodiment illustrated is to prepare the hologram recording medium for the hologram image that record has scatter plate 30, and right The hologram recording medium strafes coherent light, and the diffraction light of acquisition is used as to the situation of illumination light.Herein, the hologram recording is substituted Recording medium, discusses the variation that make use of microlens array.

Figure 36 is the side view for the variation that make use of the microlens array.The lighting device 120 of the variation is by micro- Lens array 48, coherent source 50, beam sweep device 60 are formed.Coherent source 50 is identical with the embodiment illustrated before, is The light source of coherent beam L50 is produced, specifically, laser light source can be used.

Moreover, beam sweep device 60 is identical with the embodiment so far illustrated, it is to carry out the light that coherent source 50 produces The device strafed of beam L50.More specifically, having makes light beam strafing basic point B bendings to expose to microlens array 48 Function, and according to changing over time the bending state of light beam L50 so that light beam L60 is to the irradiation position of microlens array 48 The mode changed over time is strafed.

On the other hand, microlens array 48 is the optical element for the aggregate for including multiple separate lenses.It is micro- to form this The separate lenses of lens array 48 all have make from strafe basic point B injection anaclasis and on the smooth surface R of lighting object thing 70 Form the function of specifying irradiation area I.And also formed on smooth surface R using the irradiation area I that any separate lenses are formed Identical common region.As having the function of this microlens array, for example, it is commercially available have be referred to as the micro- of " fly's-eye lens " Lens array.

Figure 37 is the side view for the operating principle for showing the lighting device 120 shown in Figure 36.Herein, for convenience of description, use Chain-dotted line represents that in the bending state of moment t1, the refractive Iy in moment t2 is represented with double dot dash line by light beam L60.That is, when T1 is carved, light beam L50 is strafing basic point B refractions, and is incident upon the independence positioned at the lower section of microlens array 48 as light beam L60 (t1) Lens 48-1.Separate lenses 48-1, which has, to be expanded from the light beam for strafing basic point B injections and is exposed to lighting object thing 70 Smooth surface R on two-dimentional irradiation area I function.Therefore, irradiation area I has been formed as shown it in smooth surface R.

Moreover, in moment t2, light beam L50 is strafing basic point B bendings, and is incident upon as light beam L60 (t2) positioned at micro- The separate lenses 48-2 of the top of lens array 48.Separate lenses 48-2 have expand from strafe basic point B injection light beam and by its Expose to the function of the two-dimentional irradiation area I on the smooth surface R of lighting object thing 70.Therefore, in moment t2, in smooth surface R It has been formed as shown irradiation area I.

In figure, for convenience of description, the operating state at 2 time points of moment t1, t2 is only shown, but in fact, During moment t1~t2, the overbending direction of light beam is smoothly varying, and light beam L60 irradiation microlens array 48 irradiation position from Slowly moved toward top the lower section of figure.That is, during moment t1~t2, on microlens array 48, strafe light beam L60's up and down Irradiation position.Certainly, in the case of the array formed as microlens array 48 using multiple separate lenses two-dimensional arrangements, Light beam is set to be strafed in the two-dimensional arrangements by beam sweep device 60.

According to the property of above-mentioned microlens array 48, no matter light beam L60 injects any separate lenses, is formed in smooth surface R On two-dimentional irradiation area I all share.That is, no matter how light beam strafes state, always form identical irradiation in smooth surface R Region I, and form identical lighting point.However, in practicality, even if the irradiation area I that is produced by separate lenses and non-fully Identical but some offsets, also have no problem as lighting device.At this time, though the position of lighting point is with time fluctuation, if will The speed of strafing of beam sweep device 60 is set near to a certain degree, then the shift in position of mankind's None- identified lighting point, only It can feel that profile is slightly hazy.

As a result, in the case of lighting device 120 shown here, beam sweep device 60 has so that light beam L60 to be irradiated The function that the mode changed over time to the irradiation position of microlens array 48 and light beam L60 irradiation microlens arrays 48 is strafed. On the other hand, form microlens array 48 separate lenses be respectively provided with make from beam sweep device 60 irradiate anaclasis and The function of irradiation area I as defined in being formed on defined smooth surface R, and it is configured to the irradiation formed by any separate lenses Region I is roughly the same common region on smooth surface R.

In the case of the lighting device 120, due to also using coherent source 50, have to observer extremely fresh Illuminating effect.That is, by the monochromaticjty of coherent light, the monochromatic face illumination of high colour purity can be carried out.Moreover, it can utilize Its directionality, forms the lighting point with sharp boundary.Furthermore if using the laser light source with bloom conversion efficiency, can The illumination of high brightness is carried out with low power consumption.And in the same manner as the lighting device of the basic embodiment with so far illustrating, it is radiated at The incident angle of the light in each portion of smooth surface R is diversified with the time, therefore can inhibit the generation of spot.

The utilization of 4-8. light diffusion elements

So far, as basic embodiment, there is the hologram recording medium of the hologram image of scatter plate 30 with usage record Illustrated exemplified by composition lighting device, in above-mentioned " 4-7 ", to carry out structure using microlens array replacing holographic seal recording medium Illustrated exemplified by into lighting device.In such lighting device, hologram recording medium or microlens array the result is that The beam spread after there is to make injection is realized to form the light diffusion element of specified irradiation area on smooth surface is specified Effect.And the light diffusion element have the irradiation area that is formed on smooth surface be identical common region and with light beam The unrelated feature of incoming position.Therefore, form the present invention lighting device be not necessarily intended to using above-mentioned hologram recording medium or Microlens array, it is however generally that, light diffusion element as characterized above can be used to form.

In short, the present invention lighting device, substantially, can by using produce coherent beam coherent source, control should Direction or position of light beam or both are to carry out the beam sweep device of beam sweep and make the beam spread after injection and injection Light diffusion element form.

Herein, beam sweep device is as long as there is so that the light beam that coherent source produces is projected and made towards light diffusion element The function that the mode that the incoming position that the light beam incides light diffusion element changes over time is strafed.Moreover, light diffusion member As long as part be configured to have the function of to make the beam spread after injection with formed on smooth surface is specified specify irradiation area and The irradiation area of formation is roughly the same common region on smooth surface and unrelated with the incoming position of light beam.

Industrial applicibility

The purposes of the lighting device of the present invention is, no matter outdoor interior can provide illumination light under circumstances.Especially It is that due to the use of coherent light as illumination light, therefore monochromaticjty or the excellent illumination of directionality can be carried out, suitable for dining room or hotel Deng indoor illumination.It is additionally, since that monochromaticjty is excellent, is consequently adapted to utilize as the illumination of color assessment.Furthermore this hair The bright not only available device for that will illuminate as direct purposes, can also be used to have in the various machines of certain illumination light Illumination light provide unit.For example, it can be used in general pattern display device, projector, strafe the devices such as instrument.

Claims (6)

1. a kind of lighting device, is the lighting device for having used coherent source, it is characterised in that possess：

Coherent source, produces coherent beam；

Microlens array, includes the aggregate of multiple separate lenses；And

Beam sweep device, the microlens array is exposed to by the light beam, and with the light beam to the microlens array The mode that changes over time of irradiation position strafe,

Form the separate lenses of the microlens array have respectively make from the anaclasis of beam sweep device irradiation with The function of being formed on smooth surface and specify irradiation area is specified, and is configured to the irradiation area formed by any one separate lenses Become identical common region on the smooth surface,

The beam sweep device is had the speculum of the reflected beams and is swept with what is defined on the reflecting surface of the speculum The driving mechanism that basic point makes the speculum be rotated in single shaft direction or biaxially oriented as fixing point is penetrated, and the light beam is swept Injection device exposes to the microlens array after the light beam is bent by speculum reflection, and by making the light The bending state of beam changes over time, so that the light beam after bending becomes the irradiation position of the microlens array with the time Change,

Form the separate lenses of the microlens array makes by the anaclasis after speculum reflection bending, in smooth surface respectively On always form identical common irradiation area, it is and unrelated with the scanning mode of light beam.

2. lighting device according to claim 1, wherein,

Multiple separate lenses are two-dimensionally configured in microlens array,

In the case where defining by strafing basic point and orthogonal on the reflecting surface V axis and W axis, beam sweep device Driving mechanism has the mechanism for making speculum be rotated around V axis and the mechanism rotated around W axis, and in level on microlens array Direction and vertical direction strafe light beam.

3. lighting device according to claim 1, wherein,

Multiple separate lenses are two-dimensionally configured in microlens array,

The driving mechanism of beam sweep device is swept in a manner of the light beam reflected by speculum is in microlens array upper drawing circle Retouch.

4. a kind of lighting device, is the lighting device for having used coherent source, it is characterised in that possess：

Coherent source, produces coherent beam；

Beam sweep device, the direction by controlling the light beam carry out beam sweep；And

Light diffusion element, makes beam spread and the injection of injection,

The beam sweep device is had the speculum of the reflected beams and is swept with what is defined on the reflecting surface of the speculum The driving mechanism that basic point makes the speculum be rotated in single shaft direction or biaxially oriented as fixing point is penetrated, and the light beam is swept Injection device exposes to the light diffusion element after the light beam that the coherent source produces is bent by speculum reflection, and And by changing over time the bending state of light beam, so that the light beam after bending is to the irradiation position of the light diffusion element Change over time,

The light diffusion element has the function of to make the beam spread of injection to specify irradiation area to be formed on smooth surface is specified, And be configured to the irradiation area to be formed and become identical common region on the smooth surface, and with the incoming position of light beam without Close.

5. lighting device according to claim 4, wherein,

In the case where defining by strafing basic point and orthogonal on the reflecting surface V axis and W axis, beam sweep device Driving mechanism has the mechanism for making speculum be rotated around V axis and the mechanism rotated around W axis, and in level side on light diffusing sheet To and vertical direction strafe light beam.

6. lighting device according to claim 4, wherein,

The driving mechanism of beam sweep device is swept in a manner of the light beam reflected by speculum is in light diffusion element upper drawing circle Retouch.