CN100517128C

CN100517128C - Display apparatus, hologram reproduction apparatus and apparatus utilizing hologram

Info

Publication number: CN100517128C
Application number: CNB2007101359098A
Authority: CN
Inventors: 富田佳纪
Original assignee: Canon Inc
Current assignee: Canon Inc
Priority date: 2006-03-09
Filing date: 2007-03-09
Publication date: 2009-07-22
Anticipated expiration: 2027-03-09
Also published as: CN101034278A

Abstract

The invention is to provide a novel display apparatus. The display apparatus includes a display device including a layer constructed by including an alkali halide or an alkali earth halide of which optical characteristics are changed by a laser light irradiation of a first wavelength region equal to or larger than 190 nm but less than 380 nm; a first light source for emitting a laser light of the first wavelength region, in order to write display data in the display device; and a second light source for irradiating the display device in which the display data are written, with a light of a second wavelength region of from 380 to 800 nm.

Description

Display device, hologram reproduction apparatus and utilize the device of hologram

Technical field

The present invention relates to display device, hologram reproduction apparatus and utilize the device of hologram.In addition, the invention still further relates to and can be used as three-dimensional (hereinafter referred to as 3D) three-dimensional display and wait the hologram reproduction apparatus that uses.

Background technology

As the display device of having used alkali halide etc., well-known have the negative electrode that is called as dark trace (dark trace) pipe (chromic) accumulation pipe that stains.People are at the have colour of skiatron Direct observation based on electron beam.

In addition, the hologram reproduction apparatus that uses electron beam is also disclosed in the documents (spy opens the 2000-206858 communique).

Summary of the invention

Under the situation of using electron beam, need make the inboard of the display element that forms holographic interference fringes become vacuum system.

In addition, alkali halide or alkaline-earth halide are the electrical insulating property materials, and owing to the irradiation of electron beam, meeting is stored charge in the display element that uses this material to constitute, and takes place so-called charged sometimes.

Therefore, the invention provides a kind of new display device, hologram reproduction apparatus and utilize the device of hologram, it has used wave band as more than the 190nm and less than the laser radiation of 380nm.

The present invention 1 display device is characterized in that comprising:

Display element with the layer that comprises optical characteristics and alkali halide that less than the first wave band of laser irradiation of 380nm change or alkaline-earth halide above owing to 190nm;

To write above-mentioned display element with data and export first light source of above-mentioned first wave band of laser in order to show; With

Be used for using more than the above-mentioned display element irradiation 380nm of data and the secondary light source of second band of light below the 800nm to having write above-mentioned demonstration; And

Utilize wavelength to be equal to or greater than the above-mentioned display element of rayed of 700nm, to eliminate the above-mentioned demonstration that in above-mentioned display element, writes the 3rd light source with data.

The present invention 2 hologram reproduction apparatus is characterized in that comprising:

Comprise optical characteristics owing to 190nm above and the alkali halide that change less than the laser radiation of first wave band of 380nm or the display element of alkaline-earth halide;

Be used for holographic interference fringes being write the writing station of above-mentioned display element by the laser radiation of above-mentioned first wave band; With

To above-mentioned holographic interference fringes irradiation wave band be more than the 380nm and below the 800nm second wave band read the device that light reproduces holographic three-dimensional picture; And

Be used for light that illumination wavelength is equal to or greater than 700nm to eliminate the cancellation element of above-mentioned holographic interference fringes, wherein the reproduction that writes, utilizes the holographic three-dimensional picture that above-mentioned transcriber carries out by utilizing holographic interference fringes that above-mentioned writing station carries out repeatedly and utilize the elimination of the holographic interference fringes that above-mentioned cancellation element carries out to carry out the successively reproducing of holographic three-dimensional picture.

Above-mentioned holographic interference fringes can form by write above-mentioned display element with point data based on hologram data.

In addition, can switch stereo display and non-stereo display by the Pixel Dimensions that switches based on above-mentioned point data.

The present invention 3 hologram reproduction apparatus is characterized in that comprising:

Constitute by alkali halide or alkaline-earth halide, and its optical characteristics is above and ground floor that change less than the laser radiation of first wave band of 380nm owing to 190nm, the display element that the second layer and the 3rd layer laminate form, wherein, above-mentioned ground floor, the second layer and the 3rd layer, peak absorption wavelength under the state that optical characteristics changes owing to the laser radiation of above-mentioned first wave band differs from one another above-mentioned ground floor, it is above and below the 500nm that the above-mentioned peak absorption wavelength of the second layer and the 3rd layer is respectively 380nm, more than the 500nm and below the 600nm, and more than the 600nm and below the 800nm;

Be used for holographic interference fringes being write the writing station of above-mentioned display element by the laser radiation of above-mentioned first wave band;

Be used for the transcriber that light reproduces holographic three-dimensional picture is read in the above-mentioned display element irradiation that has write above-mentioned holographic interference fringes; And

The present invention 4 the device that utilizes hologram is characterized in that comprising:

Comprise optical characteristics owing to 190nm above and the alkali halide that change less than the laser radiation of 380nm first wave band or the body holographic recording medium of alkaline-earth halide;

Be used for above-mentioned body holographic recording medium is shone first light source of above-mentioned first wave band of laser; With

Be used for shining more than the 380nm and the secondary light source of reading light of second wave band below the 800nm to above-mentioned body holographic recording medium,

Make above-mentioned body holographic recording medium and above-mentioned first light source relatively carry out 3 dimension scannings, thereby on above-mentioned body holographic recording medium, form body holographic interference fringes based on bit data.

Use a plurality of layers that constitute by alkali halide or alkaline-earth halide to constitute above-mentioned body holographic recording medium,

About above-mentioned a plurality of layer, its optical characteristics is owing to the laser radiation of above-mentioned first wave band changes, and the peak absorption wavelength under the state that optical characteristics changes is differed from one another.

In addition, the present invention has following feature.

Display device of the present invention is characterized in that comprising:

Display element with the layer that comprises optical characteristics and alkali halide that less than the laser radiation of first wave band of 380nm change or alkaline-earth halide above owing to 190nm;

Be used for using more than the above-mentioned display element irradiation 380nm of data and the secondary light source of second band of light below the 800nm to having write above-mentioned demonstration.

Above-mentioned display element can have a plurality of above-mentioned layer that material that the peak absorption wavelength by light differs from one another constitutes.

Above-mentioned first light source and secondary light source can be made of a wavelength variable light source.

Above-mentioned demonstration can be a hologram data with data.

Hologram reproduction apparatus of the present invention is characterized in that comprising:

To above-mentioned holographic interference fringes irradiation wave band be more than the 380nm and below the 800nm second wave band read the device that light reproduces holographic three-dimensional picture.

Above-mentioned holographic interference fringes can write above-mentioned display element with point data based on hologram data.

Also comprise the cancellation element that is used to eliminate above-mentioned holographic interference fringes,

The successively reproducing of holographic three-dimensional picture is carried out in reproduction that writes, utilizes the holographic three-dimensional picture that above-mentioned transcriber carries out that can be by utilizing holographic interference fringes that above-mentioned writing station carries out repeatedly and the elimination that utilizes the holographic interference fringes that above-mentioned cancellation element carries out.

Above-mentioned cancellation element can be by laser radiation, make electromagnetic wave or hotwork be used for eliminating above-mentioned holographic interference fringes.

The wavelength that above-mentioned laser radiation is used can be more than the 700nm.

The irradiation of reading light of above-mentioned second wave band can with the laser radiation of above-mentioned first wave band that above-mentioned display element is carried out, carry out from the same side.

Device is gone in last literary sketch can form above-mentioned holographic interference fringes on the imaginary plane of the depth direction that is specified in above-mentioned display element.

Can switch stereo display and non-stereo display by the Pixel Dimensions that switches based on above-mentioned point data.

Hologram reproduction apparatus of the present invention is characterized in that:

Comprise by alkali halide or alkaline-earth halide constituting, and its optical characteristics is owing to wave band is the above and display element that form less than ground floor, the second layer and the 3rd layer laminate that the laser radiation of first wave band of 380nm changes of 190nm, wherein,

Above-mentioned ground floor, the second layer and the 3rd layer, the peak absorption wavelength under the state that optical characteristics changes owing to the laser radiation of above-mentioned first wave band differs from one another,

It is above and 500nm is following, 500nm is above and 600nm is following and 600nm is above and below the 800nm that the above-mentioned peak absorption wavelength of above-mentioned ground floor, the second layer and the 3rd layer is respectively 380nm,

Also comprise the laser radiation that is used for by above-mentioned first wave band with holographic interference fringes write above-mentioned display element writing station and

Be used for the transcriber that light reproduces holographic three-dimensional picture is read in the above-mentioned display element irradiation that has write above-mentioned holographic interference fringes.

Can use from wave band as the wavelength peak of selecting second wave band more than the 380nm and below the 800nm as more than the 380nm and below the 500nm, wavelength peak as more than the 500nm and below the 600nm and wavelength peak read light as three kinds more than the 600nm and below the 800nm, reproduce above-mentioned holographic three-dimensional picture on the above-mentioned display element of above-mentioned holographic interference fringes writing.

The reproduction that writes, utilizes the holographic three-dimensional picture that above-mentioned transcriber carries out that can be by utilizing holographic interference fringes that above-mentioned writing station carries out repeatedly and utilize the elimination of the holographic interference fringes that above-mentioned cancellation element carries out to carry out the successively reproducing of holographic three-dimensional picture.

Can switch stereo display and non-stereo display by the Pixel Dimensions that switching utilizes above-mentioned point data to write.

The device that utilizes hologram of the present invention is characterized in that comprising:

Comprise optical characteristics owing to 190nm above and the alkali halide that change less than the laser radiation of first wave band of 380nm or the body holographic recording medium of alkaline-earth halide;

Above-mentioned body holographic recording medium uses a plurality of layers that formed by alkali halide or alkaline-earth halide to constitute,

Above-mentioned a plurality of layers optical characteristics is owing to the laser radiation of above-mentioned first wave band changes, and the peak absorption wavelength under the state that optical characteristics changes is differed from one another.

According to the present invention, new display device, hologram reproduction apparatus can be provided and utilize the device of hologram.

Other features of the present invention can be come further clear and definite by the explanation of embodiment being carried out below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is used to illustrate synoptic diagram of the present invention.

Fig. 2 is the signal that is illustrated in the situation of display holography interference fringe in the device of Fig. 1.

Fig. 3 is illustrated in the synoptic diagram that carries out the situation of the reconstruction of hologram in the device of Fig. 1.

Fig. 4 A, Fig. 4 B are on structure and energy comes the key diagram of the coloring principle of employed material with look center on the display surface of device of presentation graphs 1.

Fig. 5 is the synoptic diagram that is illustrated in the situation of display body holographic interference fringes in the body reconstruction of hologram of the present invention.

Fig. 6 is the curve map that comparison sheet is shown in the transmitted spectrum behind the Ultra-Violet Laser pre-irradiation that is used for the potassium bromide on the display surface in the embodiment of the invention 1.

Fig. 7 is the curve map that is illustrated in the postradiation transmitted spectrum of Ultra-Violet Laser of the NaBr that is used for display surface soil in the embodiment of the invention 5.

Fig. 8 is the curve map that is illustrated in the postradiation transmitted spectrum of electron beam of the rubidium chloride that is used in the embodiment of the invention 7 on the display surface, potassium chloride, potassium fluoride.

Fig. 9 is that expression uses 2 beam interference exposure of prior art to form the synoptic diagram of the situation at look center.

Figure 10 is the figure that is illustrated in the postradiation reflectance spectrum of Ultra-Violet Laser of rubidium chloride, sodium bromide, potassium fluoride in the body reconstruction of hologram of the present invention.

Figure 11 is the skeleton diagram of an embodiment of display device.

Embodiment

Below, illustrate to form process of the present invention.

The inventor recognizes through further investigation, by being that first wave band of laser more than the 190nm and below the 380nm is (because wave band is in ultraviolet region to the material that constitutes by alkali halide or alkaline-earth halide irradiation wave band, so abbreviate " Ultra-Violet Laser " below sometimes as), chemical characteristic changes, and the variable condition of this material is more stable.

And, the inventor recognizes and uses above-mentioned alkali halide or alkaline-earth halide that relevant change of optical property is reversible, if utilize this reversibility, just can realize novel display device or hologram reproduction apparatus that application is very high, thereby make the present invention.

(embodiment 1: display device)

The display device of present embodiment (Figure 11) has following feature.

At first, this display device comprises display element 1190, and above-mentioned display element 1190 has: comprise by the alkali halide that changes more than the 190nm and less than the illumination optical characteristic of first wave band of laser 1192 of 380nm or the layer of alkaline-earth halide.

At this, about the material that constitutes above-mentioned layer etc., the content that illustrates in embodiment described later directly is suitable for.

And the display device of present embodiment comprises:

To write above-mentioned display element with data and export first light source 1191 of above-mentioned first wave band of laser 1192 in order to show; With

Be used for the illumination of second wave band more than the 380nm and below the 800nm is mapped to the secondary light source (not shown) that has write on the above-mentioned demonstration usefulness above-mentioned display element of data.

At this, about first light source and secondary light source, the content that illustrates in embodiment described later directly is suitable for.

In Figure 11, though do not represent secondary light source, with respect to display element 1190, it both can be arranged on a side identical with first light source, also can be arranged on an opposite side.

In the display element of present embodiment, comprise following two notions at least.

A. first notion

That is, be image or character data to be write on the display element with certain materials such as alkali halides with above-mentioned first light source, make light incide this element then with above-mentioned second wave band, use the situation of above-mentioned display element as light filter.

In these cases, the transmittance of institute's incident or not transmission are to change according to the position that above-mentioned first light source writes.If utilize above-mentioned phenomenon, then can use above-mentioned display element as similarly being used to show the optical modulation element of non-stereo-picture with LCD etc.

And, more than illustrated and utilized the light transmissive situation of incident (display device of so-called transmission-type), but also display element of the present invention can be applicable to the display device of reflection-type.

B. second notion

Be to read light to be input to the situation that display element realizes that stereo-picture shows.

In the following embodiments, just use hologram to show that the situation of stereo-picture has been described in detail especially, but the present invention might not be confined to utilize the display device of hologram.

(embodiment 2: hologram reproduction apparatus)

Describe with regard to hologram reproduction apparatus.

Fig. 1 expresses the display surface 1 of display element, and this display element comprises by more than the 190nm and less than the irradiation of the laser 2 of first wave band of 380nm and alkali halide or alkaline-earth halide that optical characteristics changes.

Express the Ultra-Violet Laser irradiation unit 4 of the laser 2 that is used to shine first wave band.

As Ultra-Violet Laser irradiation unit 4, can be suitable for gas lasers such as excimer laser or utilize semi-conductive solid state laser.

Laser 2 by shining above-mentioned first wave band writes above-mentioned display element with holographic interference fringes 3.

By being that the light 5 of reading of second wave band more than the 380nm and below the 800nm shines on the above-mentioned holographic interference fringes 3 and reproduces holographic three-dimensional picture with wave band.Read light 5, for example the visible laser that above-mentioned wave band comprised is shone on the holographic interference fringes 3 by the amplifying lens that uses as required 9.

So, as shown in Figure 1, can obtain reconstruction of hologram space image 6.

At this said holographic interference fringes is according to, writing above-mentioned display element as point data with Ultra-Violet Laser irradiation unit 4 and obtain to the hologram data of this device from outside input (perhaps input in advance).

Certainly, in hologram reproduction apparatus, also can be provided for eliminating the cancellation element of above-mentioned holographic interference fringes.

Can be by carrying out the holographic interference fringes write step based on above-mentioned writing station, the successively reproducing that reproduces step and carry out holographic three-dimensional picture based on the holographic interference fringes removal process of above-mentioned cancellation element based on the holographic three-dimensional picture of above-mentioned transcriber repeatedly.

And, removing method is not limited especially, can be by above-mentioned display element being carried out laser radiation, imposing electromagnetic wave or heat is carried out.

Under situation about eliminating, use wavelength to be the LASER Light Source more than the 700nm by above-mentioned laser radiation.

And, write with LASER Light Source, reproduce with light source and elimination and use light source, if variable light source then can be realized with a light source.

As shown in Figure 1, the irradiation of reading light 5 of above-mentioned second wave band can with the laser radiation of above-mentioned first wave band that above-mentioned display element is carried out, carry out from the same side.

In addition, above-mentioned writing station 4 can form above-mentioned holographic interference fringes on the imaginary plane of stipulating on the depth direction of above-mentioned display element.

And, by switching the Pixel Dimensions that writes according to above-mentioned point data, just can switch stereo display and non-stereo display (describing in detail later on).

Below, describe in detail with reference to accompanying drawing and to be used to implement preferred implementation of the present invention.

Fig. 1 is the figure of an embodiment structure of expression hologram reproduction apparatus of the present invention.In addition, about the body reconstruction of hologram of the present invention, describe later on.

Among the figure 1 is optical characteristics owing to the display surface that the irradiation of ultraviolet laser changes.Ultra-Violet Laser irradiation unit 4 with Ultra-Violet Laser 2 optically focused to display surface 1, while and carry out two-dimensional scan according to the digital hologram diagram data and carry out intensification modulation irradiation, reproduce needed holographic interference fringes 3 thereby write space image.Generation method about the digital hologram diagram data describes later on.

Reading light irradiation device is that the light 5 of reading of second wave band more than the 380nm and below the 800nm shines the holographic interference bar that writes display surface 1 and splits on 3 with wave band, reproduces reconstruction of hologram space image 6.Can use alkali halide or alkaline-earth halide to constitute as display surface 1.

As reading light irradiation device, by visible laser 7 and amplifying lens 9 grades that shine on the display surface 1 after its visible laser that sends is amplified constitute.As reading light irradiation device,, hologram can use white light for being further improved also.

At this, the wavelength of Ultra-Violet Laser 2 is to be below the 380nm below the visible wavelength of human eye, and is preferably with international system of units (SI) and is defined as below the 360nm of ultraviolet region.In addition, be the vacuum ultraviolet zone below the well-known 190nm, because atmosphere former thereby absorption loss is increased need utilize the lens combination of special substance according to the relation of wavelength and refractive index, so can not bring into play the advantage of laser with respect to electron beam effectively.

Therefore, in the present invention, preferably use the ultraviolet band that 190nm is above and 360nm is following.For example, can use the pulsed laser of 3 times of higher hamonic waves of YAG laser (355nm), 4 times of higher hamonic waves of YAG laser (266nm) or KrF excimer laser (248nm), ArF excimer laser (193nm) etc.And then, also can use the semiconductor laser or the surface-emitting laser of the ultraviolet band of developing now.

The reason of using laser is because the high and holographic beam condenser height that needs that writes of the energy density of laser.As Ultra-Violet Laser irradiation unit 4, by the lens that are used to make Ultra-Violet Laser optically focused, be used for regulation Ultra-Violet Laser irradiation position ultraviolet with catoptron or be used for formations such as galvanometer (galvano) mirror that Ultra-Violet Laser scans or prismatic polygon mirror.Can also be provided for eliminating the cancellation element 8 of the interference fringe 3 that writes display surface 1 as required.

Then, describe with regard to above-mentioned digital hologram diagram data.It is recorded in the previously presented spy of the inventor and opens in the 2000-206858 communique (patent documentation 2).The digital hologram diagram data is prepared in advance with following method.Same with general holographic recording, (can the interfere) light (fluctuation) that will be concerned with shines on the object, makes its scattering, reflection or transmitted light and interferes with reference to light.

General laser or the electron beams etc. of using are as this fluctuation.In order to realize purpose of the present invention, interference figure need be carried out record as two-value or many-valued electric signal, therefore use the device of imaging apparatus as the record interference figure.Also can directly photograph, make its imaging on diffuser plate interference fringe.Perhaps also can once read image as the gradation pattern of photosensitive material.

General imaging apparatus is the density of tens of microns of each pixels, and interference figure is generally below several microns, so carrying out record with amplifying lens etc. again after with the interference fringe enlarging projection.In addition, even do not use actual object, also can use the data that are known as the CG hologram that adopt computer graphics techniques to calculate interference fringe.

Situation when Fig. 2 represents the display holography interference fringe.As shown in Figure 2, Ultra-Violet Laser 2 is shone on the display surface 1, on the alkali halide that constitutes display surface 1, form the look center of point-like by Ultra-Violet Laser irradiation unit 4.Promptly carry out two-dimensional scan on one side with bit data according to digital hologram, by Ultra-Violet Laser irradiation unit 4 carry out the intensification modulation of Ultra-Violet Laser 2 on one side, the holographic interference fringes 3 that constitutes by point group formed.

Fig. 3 represents the situation of the reconstruction of hologram.As shown in Figure 3, make with holographic interference fringes 3 and to read light 5 and produce diffraction and interference, thereby form reconstruction of hologram space image 6.In addition, by making holographic interference fringes 3 turn back to ground state based on the laser radiation of cancellation element 8 or heating etc.Make reconstruction of hologram space image successively reproducing by the demonstration of carrying out next holographic interference fringes repeatedly, the reproduction of reconstruction of hologram space image.Self-evident, colored situation about showing too.

At this, on digital hologram display surface 1 of the present invention, use the material that forms by following kation and negative ion combination as alkali halide or alkaline-earth halide.

Can use more than one kation in lithium, sodium, potassium, rubidium, caesium, francium, beryllium, magnesium, calcium, strontium, barium, the radium as kation.Can use more than one negative ion in fluorine, chlorine, bromine, iodine, the astatine as negative ion.The salt that uses it to constitute.

In addition, also can use the potpourri of forming by above-mentioned a plurality of kations and a plurality of negative ion.And then, can also use perchloric acid negative ion or hyperbromic acid negative ion etc. and alkali or the cationic perhalide that combines of alkaline earth.Below these are generically and collectively referred to as the material with look center.

Above-mentioned material with look center does not have optical absorption on visible waveband, so general monocrystal is water white.Material with look center is painted on the position of Ultra-Violet Laser irradiation, and its refractive index changes in specific wave band simultaneously.

Be characterised in that reading light (laser that general use can be interfered is used visible laser so be called to reproduce) comprises this painted wavelength and variations in refractive index wave band.In addition, on the position of not shining Ultra-Violet Laser, absorption in the visibility region and refractive index do not change, for transparent or white, and the transmissivity of laser or reflectivity height.Utilize this character with its diffractive filter, and set the shape of suitable holographic interference fringes 3, can reproduce reconstruction of hologram space image in view of the above as reproduction usefulness visible laser.

It is believed that material with look center owing to the Ultra-Violet Laser irradiation produces exciton (electronics and hole to), electronics is caught by trap level, formation look center.

That is,, be documented in " the 228th, 398 page of light rerum natura handbook about the look center.

Fig. 4 A and Fig. 4 B are on the structure and energy represents to have the figure of coloring principle of the material at look center.

Painted mechanism can be described as based on the halogen chamber position of electronics at ionic crystal and is hunted down shown in Fig. 4 A.

On energy shown in Fig. 4 B, between conductive strips and valence band, trap level is arranged, with the such electromagnetic wave of Ultra-Violet Laser electronics is energized on the trap level (below, be referred to as 1 time and excite, and electron excitation is called excited state to the state on the trap level) from valence band.Electronics on this trap level has the long such feature of following life-span of temperature about room temperature.

And have following feature: captive electronics is energized on the conductive strips (below, be referred to as 2 times and excite) by visible light (laser) or heat again from trap level, then disappears in color when conductive strips turn back to valence band.

This coloring phenomenon is applied to using the skiatron of electron beam.

Skiatron is to shine electron beam on the alkali halide and make it painted, and it is carried out the device of Direct observation.Because Direct observation coloring site in skiatron, so the spot diameter of electron beam is bigger.

Different therewith, in the invention of present embodiment, use ultraviolet laser as the device that forms the look center.

In addition, on display surface the image that shows Direct observation, but the display holography interference fringe.Therefore, the Ultra-Violet Laser spot diameter is less, and, not only use Ultra-Violet Laser, also make and read light, eliminate light or hotwork is used for display surface, carry out image and form.

General fluorophor also can utilize on ultraviolet laser is energized into conductive strips or trap level as excitation level from the valence band as lowest energy level, but often shorter in the life-span in excitation level about room temperature.

And general fluorophor is so that to be used as luminous fluorescence be purpose, and its color does not change, even perhaps its color changes, can not adopt the such usage of light filter yet.

General fluorophor is released owing to the thermal motion in excitation level, diffusion make electronics, turns back to ground state while send fluorescence, excites (fluorescence) life-span shorter.

Display surface of the present invention is characterised in that its excited state is heat-staple, keeps colored state continuously and is applied to it with visible laser (and then for eliminating light) up to Ultra-Violet Laser irradiation that makes a frame amount and reproduction.

The present invention uses water white transparency or white alkali halide or alkaline-earth halide under ground state.

As mentioned above, in the present invention, it is painted on the position that is shone by ultraviolet laser that alkali halide or alkaline-earth halide etc. have the material at look center, and the reproduction of this painted wavelength is low with transmissivity, the reflectivity of visible laser, and refractive index also changes.Relative therewith, there is not the absorption of visibility region in the position of not shining Ultra-Violet Laser, for transparent or white, the transmissivity of laser or reflectivity height and refractive index do not change.

The invention is characterized in, utilize this characteristic, it as the light filter or the space optics modulator (SLM) that reproduce with visible laser, and is reproduced holographic three-dimensional picture by combining with suitable holographic interference fringes shape.

The absorption of the visible waveband under the Ultra-Violet Laser excited state, exciting to (again) of valence band from trap level of can thinking that light by the wavelength that is equivalent to the energy gap between trap level and the valence band causes causes.The display surface that is made of the material with look center among the present invention is brought into play function as reproducing with the light filter of visible laser, reproduces with visible laser diffraction, interference by showing that suitable holographic interference fringes shape makes, thus reconstructing hologram.

In addition, use the device of reading light of irradiation R, G, B three look wavelength as reading light irradiation device.And then, as the Ultra-Violet Laser irradiation unit, use to write respectively the device of reading the different a plurality of holographic interference fringes of the variations in refractive index of light light absorption variation in corresponding minute and/or specific band and/or holographic interference fringes spacing with three looks.Reproduce when in view of the above, also can carry out trichromatic hologram image.

Sometimes for damp proof, antisitic defect etc., also implement surface applied in the outside of display surface and handle.In addition, also can on transparency carrier surfaces such as glass, form material, by glass is taken into account damp proof, antisitic defect as the outside with look center.

Following two kinds of situations are arranged: i.e. the reflection-type that playback light and the irradiation of reading light is in the transmission-type configuration and the playback light of opposition side and is in same side with the irradiation of reading light disposes.As the cancellation element of hologram, can be with light, electromagnetic wave or heat are done in order to eliminate the device of holographic interference fringes.

Below, the present invention is described in detail in detail.The object of the present invention is to provide principle according to hologram, do not use the mother matrix (master) that causes image quality decrease but and can reproduce the three-dimensional display of images continuously.The present invention relates to three-dimensional display (holographic successively reproducing device) is transcriber, but some explanations are also carried out in shooting.

In when shooting, identical with general holographic recording, (can the interfere) light (fluctuation) that will be concerned with shines on the object, makes its scattering, reflection or transmitted light and interferes with reference to light.General laser or the electron beams etc. of using are as this fluctuation.In order to realize purpose of the present invention, interference figure need be carried out record as two-value or many-valued electric signal, so use the device of imaging apparatus as the record interference figure.Also can directly photograph, make its imaging on diffuser plate holographic interference fringes.Perhaps also can once amplify the gradation pattern that reads photosensitive material.

When directly holographic interference fringes being photographed, the spectral sensitivity of consideration imaging apparatus or identical with general photography to the linearity this point of light intensity.General imaging apparatus is the density of tens of microns of each pixels, and interference figure is generally below several microns, so will carry out record after the interference fringe enlarging projection with amplifying lens etc.

In addition, except that said method,, also can use CGH (computer hologram) data that adopt computer graphics techniques calculation holographic interference fringe as the method for not using actual object.

The interference figure that obtains with above such known method, after carrying out Flame Image Process and transmission, be used as the defection signal of Ultra-Violet Laser or the output modulation signal of irradiation coordinate signal and Ultra-Violet Laser, Ultra-Violet Laser is carried out scanning and intensity modulated with respect to the position on holographic display surface, and holographic display surface is shone.As the scan method of Ultra-Violet Laser, be generally on one side the enterprising line scanning of main scanning direction X and successively with the sub scanning direction Y of its quadrature on move, carry out the scan method (raster scanning) that the brightness (intensity) of Ultra-Violet Laser is modulated on one side.

Perhaps, also on one side mobile display surface changing itself and the relative position of Ultra-Violet Laser, on one side Ultra-Violet Laser carried out brightness (intensity) modulate.In the intensification modulation of Ultra-Violet Laser, can adopt the mechanical blanking method of DLP that input signal (voltage, electric current, pulse width etc.) control to laser instrument or galvanometer mirror, TI company produce etc. etc.

Being characterized as of display surface changes its rerum natura by Ultra-Violet Laser and makes optical diffraction.Be that display resolution and wavelength of visible light are equal, be below 20 microns, preferably below 1 micron.The ultraviolet that Ultra-Violet Laser can use high NA is with below the lens light gathering to 1 micron and can carry out the high precision scanning of scanner or objective table.Can make optical diffraction by on display surface, forming the interference fringe that constitutes by optical transmission rate or change of refractive.

Hologram mainly is divided into two kinds of amplitude type and phase types.Amplitude type has silver halide film or photochromic material, and theoretical diffraction efficiency is 6.25%.Phase type has dichromated gelatin or high molecule liquid crystal etc., and theoretical diffraction efficiency is 34%.

As utilizing Ultra-Violet Laser to cause the material that this rerum natura changes, use material with look center.

For the material with look center, as described above, the reproduction that the material that is used to form the Ultra-Violet Laser of first wavelength that uses in the exciting of look center and shines this excited state is produced second wavelength of diffraction is applied to it with visible laser.And, as required, for the material that shines excited state makes it return ground state thereon with the exciting light of three-wavelength or heat effect.The 3rd excites light wavelength generally greater than the reproduction visible laser.In addition, under the situation of successively reproducing cycle length, preferably eliminate by heating.

Because TV in the past is a direct display image on display surface, so just enough as long as reach the display resolution of resolution of eye degree.In the present invention, being presented on the display surface is the holographic interference fringes that can make optical diffraction, need be than the high demonstration of cathode-ray tube (CRT) fluorophor exploring degree in the past.Preferably use the display surface that has adopted material in the present invention with 1 micron left and right sides display resolution with look center.As mentioned above, the electronics in look center is hunted down at the halogen lattice imperfection of ionic crystal and constitutes, so use the resolution of its display surface to reach the degree of tens of dusts on principle, very high, the demonstration exploring degree of hologram exists with ... the Ultra-Violet Laser of exposure.

Ultra-Violet Laser can suitably use the 4 times of higher hamonic waves of 3 times of higher hamonic waves of YAG laser (355nm), YAG laser (266nm) of monotype or the pulsed laser of KrF excimer laser (248nm), ArF excimer laser (193nm) etc. etc.Also can use the semiconductor laser or the surface-emitting laser of ultraviolet bands such as aluminium nitride class now just under development.Ultra-Violet Laser can use the ultraviolet of high NA with object lens its spot diameter to be narrowed down to 10 μ m and even below the 1 μ m.

Material with look center, by the part that Ultra-Violet Laser excited and the part of ground state, the transmissivity on specific band, reflectivity and refractive index are different.Therefore, not only need to consider the spacing of holographic interference fringes, will consider that also reconstruction of hologram light is visible Wavelength of Laser, for example rubidium chloride has absorption about 640nm, corresponding to the wavelength of helium-neon laser.

The variation of transmissivity exists with ... Ultra-Violet Laser energy density, pulse width, number of pulses, toggle frequency, but in the example of above-mentioned rubidium chloride with before Ultra-Violet Laser excites, compare, reflectivity under the 640nm situation is 50% to 80%, can obtain sufficient contrast.Transmissivity with compare the variation that also can obtain about 50% to 80% before Ultra-Violet Laser excites.Refractive index also changes simultaneously, and hologram of the present invention is owing to being amplitude and phase place mixed type, so can realize high-diffraction efficiency.

As the display surface that is used for the reconstruction of hologram, with general the same physical strength, anti-Ultra-Violet Laser impact and the environmental stability etc. of requiring of televisor.Above-mentioned alkali halide has the not high and bibulous characteristic of hardness, therefore preferably applies surface-coated on alkali halide, or forms alkali halide and glass substrate is faced laterally on glass substrate.Ultra-Violet Laser is exposed from alkali halide face side.

Based on the painted ionic crystal structure that comes from microcosmic of Ultra-Violet Laser, be monocrystal or fusion monocrystal so be used for that crystal on the display surface need not, also can be polycrystal or powder etc.Just no longer include scattering and on visible waveband, obtain transparent display surface if carry out single crystals, thereby can be used as transmission-type and use.

In addition, under the situation of the reflective holographic transcriber that is used to laser-bounce diffraction of light, interference from display surface, substrate need not also can use aluminium oxide or silicon substrate etc. into transparent.Can be transmission-type or reflection-type according to hologram successively reproducing device, the method for making or the unijunction crystallinity of the material with look center by constituting display surface be controlled the crystal transparency.

Under the situation of monocrystal, in grinding step, implement smoothing processing in order to make optical element and transparency is improved.But, even so also still exist because the scattering problem that residual surfaceness or surface adsorption etc. cause.In addition, can not avoid Fresnel reflection to the light that incides on the different interface of refractive index, the diffraction light from hologram then is observed as stray light on the surface.

In this case, display holography figure from the teeth outwards but on the certain imaginary plane of depth not preferably.In order to realize this point, after the wavelength of considering Ultra-Violet Laser or hologram position size, hope is used more than the NA0.3 and depth of focus is that the following lens of 10 μ m carry out optically focused.

Use these lens to make focus be included in display surface inside,,, can form hologram having on the imaginary plane of certain depth in view of the above Yi Bian expose with Ultra-Violet Laser Yi Bian display surface is moved with respect to Ultra-Violet Laser.

As the method that on substrate, forms crystal, can utilize based on the crystallization of evaporating solvent from strong solution or the formation of fuse salt, the various coatings of solution.In addition, can also add polyvinyl alcohol (PVA) as required and wait coating or the bond strength of improving substrate.In addition, can also use various adjuvants.Perhaps make material film forming on substrate with look center by vapour deposition method.

So, when formation has the material at look center on substrate, make the outside (external world) of substrate towards hologram reproduction apparatus, on not making material, produce the mechanicalness defective with look center or the defective that causes by moisture absorption in, preferably make Ultra-Violet Laser directly to its irradiation.

And, carrying out colour when showing, need make absorbing wavelength and R, G, B three primary colors corresponding.For example, lithium bromide or lime chloride are the yellow absorption blue laser, and potassium chloride etc. are the red green laser that absorbs, and cesium bromide etc. are the blue red laser that absorbs.If their are mixed then can independently absorb the laser of each wavelength, make transmissivity or reflectance varies.

When having mixed three kinds of materials with look center, three kinds of materials with look center mix existence on display surface, but particle diameter separately is tiny, is at least below 1/3rd of Ultra-Violet Laser beam diameter.Therefore, three kinds of materials carry out painted simultaneously in the light beam of Ultra-Violet Laser.

But, there is such uniqueness, promptly reproduce with in the visible laser at R, G, B, have only a kind of material to satisfy diffraction conditions to the light of a certain wavelength.For example, use under the situation of display surface at the colour of aftermentioned embodiment 4, the laser of 633nm sees through the holographic interference fringes of potassium bromide or potassium fluoride, only is formed on holographic interference fringes absorption, diffraction on the rubidium chloride.

In addition, only the light of the 633nm of diffraction interferes when the spacing of this holographic interference fringes satisfies interference condition, becomes reconstruction of hologram space image.In fact, the chromatic resolution of three kinds of materials with look center and not exclusively, and also interference condition also is difficult to separate fully and produce optical interference from the resolution of Ultra-Violet Laser.

First purpose of the present invention is stereo display, but also can be applicable to non-stereo display.

Holographic interference fringes when carrying out stereo display is implemented Fourier transform, and because the spatial frequency height, so, can not discern as significant image even the people directly observes.

In the present invention, can observe directly such size owing to use ultraviolet laser that stereo display uses that the spot diameter of coloring site is expanded to, so also can carry out non-stereo display.

As described above, because alkali halide itself is colored, turned to the display device that is called skiatron by product.Obviously, also can be used as non-three-dimensional display and be used if increase Pixel Dimensions in the present invention.

The invention is characterized in, replacing the electron beam of skiatron, when using, reducing Pixel Dimensions (point) as three-dimensional display except using Ultra-Violet Laser.In addition, it is characterized in that, when using, make Pixel Dimensions increase to the degree that human eye can be discerned as non-three-dimensional display.

The Pixel Dimensions that human eye can be discerned is generally considered to be about 2400dpi when showing with two-value, so discern if the above Pixel Dimensions of 10 μ m * 10 μ m then can be used as image.Therefore, 3D can be switched or 2D shows.

As the method for switching Pixel Dimensions, for example there is the laser output of the Ultra-Violet Laser irradiation unit 4 that makes Fig. 1 to change, make holographic interference fringes to write fashionable scan speed change, make method such as Ultra-Violet Laser irradiation energy variable density by superimposed pulses etc.As mentioned above, when switching to the Pixel Dimensions of 10 μ m * more than the 10 μ m, improve the laser output of Ultra-Violet Laser irradiation unit 4, the holographic interference fringes that slows down is write fashionable sweep velocity or is increased Ultra-Violet Laser irradiation energy density and gets final product.

In addition, the alkali halide display surface that lamination is corresponding with the RGB three primary colors makes focal position of laser corresponding to one of lamination display surface, forms based on the painted point in look center non-stereo-picture that in view of the above can display color according to non-stereoscopic image data.

Different with skiatron is not use electron beam, so do not have chargedly, has the feature that does not need metal backing such.Therefore, in skiatron, the penetration depth of electron beam is shallow, multiplexed being practically impossible on the thickness direction on the display surface, so skiatron is limited to monochromatic the demonstration, or under the situation that colour shows, need critically shine the electronics line to the pixel region that forms in face.

In the present invention, also can carry out paintedly to each layer, show so can carry out colour, and can carry out pixel selection by Ultra-Violet Laser being addressed energy with (X, Y, Z) coordinate by three kinds of dyed layers of lamination even carry out lamination.

At this moment, can distribute by using NA height, lens that the depth of field is little in narrow and small scope, to set high laser energy density, so the address of thickness direction is definite easily.In addition, compare with the electron beam that uses in vacuum environment, laser can utilize in atmosphere, so also have the easy feature of device.

As mentioned above, to scan the holographic interference fringes display surface that shows by Ultra-Violet Laser, illumination wavelength satisfies the reproduction visible laser of interference condition comprehensively.So, excite, on the painted part and other parts, reproduce with the transmissivity of visible laser differently producing with refractive index owing to Ultra-Violet Laser irradiation, diffraction and interference take place, reproduction reconstruction of hologram space image.Carry out the synthetic hologram image that produces in the space from the diffraction light of display surface each point, this and general hologram are same, can obtain static space image again.

Reconstruction of hologram space image looks and reveals or in the display surface back from display surface come-up, according to reproduce with the visible laser and the position of display surface concern different and different.But when reproducing when being positioned on the position opposite with observer one side with respect to display surface with the visible laser light source (being under the situation that the position of the necessary transmission display surface of playback light concerns), then display surface must be transparent for this playback light.

Cathode-ray tube (CRT) in the past is opaque scatterer, and the material with look center has and can become this transparent feature, satisfies above-mentioned necessary condition.In addition, the life-span of the material excited state with look center of the present invention is long, can stably keep painted state, thus can be after the holographic interference fringes that has shown a frame amount with Ultra-Violet Laser, and irradiation is reproduced and is used visible laser all sidedly.

In addition, compare with scanning,, can shorten each frame needed sweep time by carried out the Ultra-Violet Laser of intensity modulated respectively from a plurality of Ultra-Violet Laser light source irradiation with a branch of Ultra-Violet Laser.Scan if use planar VCSEL ultraviolet laser then do not need, so even more ideal.Existing people proposes to use semiconductor (laser instrument) as many Ultra-Violet Lasers light source.

Material with look center also turns back to ground state owing to reproducing with laser sometimes, but often also not exclusively.For example, a part of sometimes electronics is captured on the energy level at the F ' center that is known as once more.At this moment, preferably shine noncoherent long wavelength light of eliminating usefulness comprehensively.This is based on the elimination of above-mentioned secondary excitation light.

Preferably making display surface be warming up to hundreds of ℃ as required promotes to eliminate.Can confirm to eliminate speed dependent in temperature.For example, potassium bromide crystal half life period τ at room temperature is the several seconds, is below 1 second in the time of 100 ℃, is tens of milliseconds in the time of 500 ℃.

By carrying out these operations repeatedly, just space image can be observed as motion video with certain cycle.If should the cycle long then picture as seen glimmer, its value was generally considered to be about a thirtieth second, but under the situation of hologram, not necessarily this scope.

From the principle of the material with look center of the present invention as can be known, painted sensitivity is high, shows and the speed eliminated is exceedingly fast.Photochromic material or electrochromism material need energy and time in the ion of following molecule structure change or redox reaction moves, so painted, colour killing is slow.And material painted with look center is based on the same electronics of semiconductor switch and moves, so can high-speed response.And, also have extremely good permanance repeatedly equally with semiconductor switch.

As mentioned above, when coming color display, can realize by following structure with hologram reproduction apparatus.

At first, prepare display element, this display element is made of alkali halide or alkaline-earth halide, and is to form more than the 190nm and less than ground floor, the second layer and the 3rd layer laminate that the laser radiation of first wave band of 380nm changes by optical characteristics because of wave band.

At this, the optical characteristics of above-mentioned ground floor, the second layer and the 3rd layer is owing to the peak absorption wavelength that the laser radiation of above-mentioned first wave band changes under the state differs from one another, and the above-mentioned peak absorption wavelength that makes above-mentioned ground floor, the second layer and the 3rd layer is respectively in the scope more than 380nm and below the 500nm, more than the 500nm and below the 600nm and more than the 600nm and below the 800nm.

The present invention provides the hologram reproduction apparatus corresponding with coloured image by writing unit and reproduction units are set, and the said write device is used for by the laser radiation of above-mentioned first wave band holographic interference fringes being write above-mentioned display element,

Described transcriber is used for that light is read in the above-mentioned display element irradiation that has write above-mentioned holographic interference fringes and reproduces holographic three-dimensional picture.

As reading light, can use the above-mentioned display element that has write above-mentioned holographic interference fringes from wave band as the wavelength peak of selecting second wave band more than the 380nm and below the 800nm as more than the 380nm and below the 500nm, wavelength peak as more than the 500nm and below the 600nm and wavelength peak read light as three kinds more than the 600nm and below the 800nm.

According to the invention of present embodiment, the material that uses alkali halide or alkaline-earth halide promptly to have the look center constitutes display surface.Therefore, the optical characteristics of utilizing visibility region can be reproduced reconstruction of hologram space image continuously owing to the display surface that characteristic is more stable, the life-span is long after reversibility changes and changes takes place Ultra-Violet Laser.

Promptly, on this display surface, form holographic interference fringes with Ultra-Violet Laser, and make to reproduce with visible laser diffraction, interference with holographic interference fringes and reproduce holographic three-dimensional picture, as required, utilize the irradiation etc. of heat or Ultra-Violet Laser to make holographic interference fringes return ground state.Then, can carry out the successively reproducing of reconstruction of hologram space image by the demonstration of carrying out next holographic interference fringes repeatedly, the reproduction of reconstruction of hologram space image.

(embodiment 3: volume hologram)

Below, body hologram reproduction apparatus of the present invention is described.The reproduction of volume hologram of the present invention, higher in order to make diffraction efficiency, preferably realize picture quality height, the reconstruction of hologram space image that contrast is high.

Under the situation of the body reconstruction of hologram, as shown in Figure 1, utilize Ultra-Violet Laser irradiation unit 4 with Ultra-Violet Laser 2 optically focused to the display surface 1 of changes in optical properties.At this moment, carry out the intensification modulation irradiation, reproduce needed holographic interference fringes 3 thereby write space image while carry out two-dimensional scan according to the digital hologram diagram data.Because the structure of display surface 1 and the situation of the above-mentioned reconstruction of hologram are same, so detailed.

Volume hologram certainly uses as image display device, also can be used as information record, transcriber uses.

Reading light irradiation device is that the light 5 of reading of second wave band more than the 380nm and below the 800nm shines on the holographic interference fringes 3 that writes display surface 1 with wave band, forms reconstruction of hologram space image 6.

As reading light irradiation device, shine the amplifying lens 9 on the display surface 1 after can using visible laser 7 usually and its visible laser that sends being amplified.Reading light irradiation device also can use white light that hologram is further revised.

The explanation of the wavelength of Ultra-Violet Laser 2 and the situation of the above-mentioned reconstruction of hologram is same, is below the 380nm below the visible wavelength for human eye, and is preferably with international system of units (SI) and is defined as below the 360nm of ultraviolet region.In addition, be the vacuum ultraviolet zone below the well-known 190nm, because atmosphere former thereby absorption loss is increased need utilize the special substance lens combination according to the relation of wavelength and refractive index, thus can not bring into play effectively laser instrument with respect to the advantage of electron beam.

Under the situation of the body reconstruction of hologram, as Ultra-Violet Laser irradiation unit 4, by being used to that the lens of Ultra-Violet Laser optically focused are constituted.And, by the ultraviolet of the 3-dimensional irradiation position that is used for the regulation Ultra-Violet Laser with catoptron or the galvanometer mirror that is used to make Ultra-Violet Laser carry out XY scanning or prismatic polygon mirror or XY objective table mobile device and Z mobile device constitute.Can also be provided for eliminating the cancellation element 8 of the interference fringe that writes display surface as required.

In this structure, as shown in Figure 5, Ultra-Violet Laser 2 is shone on the display surface 1 by Ultra-Violet Laser irradiation unit 4, on the alkali halide that constitutes display surface 1, form the look center of point-like.Then, on one side carry out 3-D scanning with bit data,, form the body holographic interference fringes 3 that constitutes by point group Yi Bian carry out the intensification modulation of Ultra-Violet Laser 2 according to digital hologram.Then, as shown in Figure 3, make with holographic interference fringes 3 and to read light 5 and produce diffraction, interference, thereby form reconstruction of hologram space image 6.

And then, by making holographic interference fringes 3 turn back to ground state, carry out the successively reproducing of reconstruction of hologram space image by the demonstration of carrying out next holographic interference fringes repeatedly, the reproduction of reconstruction of hologram space image based on the laser radiation of cancellation element 8 or heating etc.

The used material of display surface under the body reconstruction of hologram situation of the present invention is generically and collectively referred to as the material with look center with these as mentioned above equally.

Material with look center does not have optical absorption as mentioned above on visible waveband, so general monocrystal is water white.Material with look center is painted on the position of Ultra-Violet Laser irradiation, and refractive index changes in specific wave band simultaneously.

The light of reading at the wavelength of this painted wavelength, variations in refractive index (is used for reproducing the visible laser that general use can be interfered, but also use white light sometimes.Below, in the body reconstruction of hologram, be called " playback light ") transmissivity and when reflectivity descends, refractive index also changes.And, not having at Ultra-Violet Laser on the position of irradiation, absorption in the visibility region and refractive index do not change, for transparent or white, the transmissivity of laser or reflectivity height.Utilize the diffractive filter of this character as playback light, and, can reproduce reconstruction of hologram space image by the shape of setting suitable holographic interference fringes 3.

In the body reconstruction of hologram of the present invention, to having the material irradiation Ultra-Violet Laser at look center, thereby form the pixel position that constitutes by the look center, in two-dimensional surface, relatively move the general hologram that forms two dimension by making material and ultraviolet laser with look center.In the body reconstruction of hologram of the present invention,, in three dimensions, relatively move the volume hologram that forms three-dimensional by making material and ultraviolet laser with look center in order further to improve diffraction efficiency.

In addition, as reading light irradiation device, use the device of reading light of irradiation R, G, B three look wavelength as mentioned above.And then, as the Ultra-Violet Laser irradiation unit, use to write respectively the device of reading the different a plurality of holographic interference fringes of the variations in refractive index of light light absorption variation in corresponding minute or specific band or holographic interference fringes spacing with three looks.Reproduce when in view of the above, also can carry out the three primary colors hologram image.

In addition, in the body reconstruction of hologram of the present invention,, also implement surface applied sometimes in the outside of display surface and handle for damp proof, antisitic defect etc.In addition, also can on transparent supporting substrates surfaces such as glass, form material with look center and with glass as the outside, thereby take into account damp proof, antisitic defect.

And following two kinds of situations are arranged: i.e. the reflection-type that playback light and the irradiation of reading light is in the transmission-type configuration and the playback light of opposition side and is in same side with the irradiation of reading light disposes.As the cancellation element of hologram, can be with light, electromagnetic wave or heat are done in order to eliminate the device of holographic interference fringes.

And the body reconstruction of hologram of the present invention provides as described above the principle according to hologram, but does not use the motherboard that causes image quality decrease and the three-dimensional display that can reproduce images continuously.The present invention relates to three-dimensional display (hologram successively reproducing device) is transcriber, but some explanations are also carried out in shooting.

In when shooting, same with general holographic recording as mentioned above, (can the interfere) light (fluctuation) that will be concerned with shines on the object, makes its scattering, reflection or transmitted light and interferes with reference to light.General laser or the electron beams etc. of using are as this fluctuation.The situation of volume hologram can obtain from the scattering of object, reflection, transmitted light with reference to light from front and back incident by thick film photoreceptor that volume hologram is used.

In order to realize purpose of the present invention, interference figure need be selected line item as two-value or many-valued electric signal, so use the device of imaging apparatus as the record interference figure.Also can directly photograph, make its imaging on diffuser plate, perhaps also can once amplify the gradation pattern that reads photosensitive material holographic interference fringes.

Consider the spectral sensitivity of imaging apparatus or to the linearity of light intensity when directly holographic interference fringes being photographed, this point and general photography are same.General imaging apparatus is the density of tens of microns of each pixels, and interference figure is generally below several microns, so will carry out record after the holographic interference fringes enlarging projection with amplifying lens etc.The focal length of adjusting camera system can obtain the depth information of volume hologram.

In addition, except that said method,, also can use CGH (computer hologram) data that adopt computer graphics techniques to calculate the body holographic interference fringes as the method for not using actual object.

In addition, also be suitable for using scan method,, can use mechanical scanners such as galvanometer mirror or prismatic polygon mirror as making Ultra-Violet Laser carry out method for scanning based on vector scan.The relative position of mobile display surface and Ultra-Violet Laser carries out brightness (intensity) modulation to Ultra-Violet Laser on one side on one side.

Except that these holograms based on two-dimensional scan form, also can be by coming the organizator hologram in the enterprising line scanning of depth direction Z.In the intensification modulation of Ultra-Violet Laser, can adopt the mechanical blanking method of DLP that input signal (voltage, electric current, pulse width etc.) control to laser instrument or galvanometer mirror, TI company produce etc. etc.

As mentioned above, display surface can make optical diffraction because of Ultra-Violet Laser irradiation rerum natura changes.Be that display resolution and wavelength of visible light are equal, be below 20 microns, preferably below 1 micron.The ultraviolet that Ultra-Violet Laser can use high NA is with below the lens light gathering to 1 micron and can carry out the high precision scanning of scanner or objective table.

As mentioned above, make optical diffraction by on display surface, forming the interference fringe that forms by optical transmission rate or change of refractive.Hologram mainly is divided into two kinds of amplitude type and phase types.Amplitude type has silver halide film or photochromic material, and theoretical diffraction efficiency is 6.25%.Phase type has dichromated gelatin or high molecule liquid crystal etc., and theoretical diffraction efficiency is 34%.In comparison, the theoretical diffraction efficiency of volume hologram of the present invention is 100%, can realize that in the past 3 times are to the high-diffraction efficiency more than 10 times.

And, be used for the liquid crystal panel or the AOM of digital hologram display medium, can not carry out the demonstration of volume hologram from its principle.The material that use has the look center is used as utilizing Ultra-Violet Laser to cause the material that this rerum natura changes.To having the material at look center, as described above, the material that uses the Ultra-Violet Laser of first wavelength of use in being used to form the exciting of look center and shine this excited state produce diffraction second wavelength read light.In addition,, the material that shines excited state returns ground state, thereon with the exciting light of three-wavelength or heat effect for making it.The 3rd excites light wavelength generally greater than reading light wavelength.In addition, under the situation of successively reproducing cycle length, preferably eliminate by heating.

As mentioned above, being presented in the present invention on the display surface is the holographic interference fringes that can make optical diffraction, need be than the high demonstration of cathode-ray tube (CRT) fluorophor exploring degree in the past.Preferably adopted the display surface with 1 micron left and right sides display resolution of material in the present invention with look center.As mentioned above, the electronics in look center is captured at the halogen lattice imperfection of ionic crystal and forms, so use the resolution of its display surface to reach the degree of tens of dusts on principle, very high, the demonstration exploring degree of hologram exists with ... the Ultra-Violet Laser of exposure.

Ultra-Violet Laser can suitably use pulsed laser of 3 times of higher hamonic waves of YAG, 4 times of higher hamonic waves of YAG or KrF excimer laser, the ArF excimer laser etc. of monotype as described above etc.Also can use the semiconductor laser or the surface-emitting laser of ultraviolet bands such as aluminium nitride class.The Ultra-Violet Laser of monotype, the exploring resolving limit height because wavelength is short can use the ultraviolet of high NA with object lens spot diameter to be narrowed down to 10 μ m and even below the 1 μ m.

As mentioned above, have the material at look center, by the part that Ultra-Violet Laser excited and the part of ground state, the transmissivity on specific band, reflectivity and refractive index are different.Therefore, not only need to consider the spacing of holographic interference fringes, will consider that also reconstruction of hologram light is visible Wavelength of Laser, for example the look center of rubidium chloride is absorbed in about 640nm, corresponding to the wavelength of helium-neon laser.

The variation of transmissivity exists with ... Ultra-Violet Laser energy density, pulse width, number of pulses, toggle frequency as described above.But compare in the example of above-mentioned rubidium chloride with before Ultra-Violet Laser excites, the reflectivity under the 640nm situation is 50% to 80%, can obtain sufficient contrast.Transmissivity with compare the variation that also can assert about 50% to 80% before Ultra-Violet Laser excites.Refractive index also changes simultaneously, and hologram of the present invention is owing to being amplitude and phase place mixed type, so can realize high-diffraction efficiency.

At this, the absorbing wavelength of rubidium chloride is about 640nm, and the peak absorption wavelength of sodium bromide is about 540nm, and the peak absorption wavelength of potassium fluoride is about 450nm.Therefore, it is thick that the present inventor is processed as 1mm with these three kinds of monocrystal, and then the surface that lamination has carried out mirror finish makes the adult holographic recording medium.Figure 10 represents the postradiation reflectance spectrum of various Ultra-Violet Lasers.

The order of lamination is to be followed successively by rubidium chloride, sodium bromide, potassium fluoride from Ultra-Violet Laser one side.The order of lamination also not necessarily must be this order.As the example that writes spacing, on above-mentioned body holographic recording medium, write interference fringe (, the method for record among the embodiment 7 described later being arranged) with different spacings respectively as an example that writes.

Make the YAG laser focusing of 266nm to the rubidium chloride layer, form focus, and carry out stage scanning in face direction (X and Y) and layer thickness direction (Z) at certain intervals, make the laser instrument ON/OFF according to CGH (computer hologram) data, thereby write the hologram of two-value.If the stage spacing of this moment is 13 μ m.

Equally, optically focused is formed focus to the sodium bromide layer, and carries out stage scanning with the spacing of 11 μ m in face direction (X and Y) and layer thickness direction (Z), thereby writes hologram.Equally, optically focused is formed focus to the potassium fluoride layer, and carries out stage scanning with the spacing of 9 μ m in face direction (X and Y) and layer thickness direction (Z), thereby writes hologram.

Then, on above-mentioned volume hologram the illumination wavelength peak value be blueness, wavelength peak more than the 380nm and below the 500nm be green, wavelength peak more than the 500nm and below the 600nm be more than the 600nm and below the 800nm redness, these three kinds of color wavelength read light.

Wavelength peak is that 380nm blue laser above and that 500nm is following can be enumerated following example.The laser diode of argon laser (488nm), He-Cd laser instrument (441.6nm), gallium nitrate kind (400nm～500nm is following), infrared semiconductor laser SHG (425nm or 410nm) etc.

Wavelength peak is the green laser that 500nm is above and 600nm is following, can select from YAG-SHG laser instrument (532nm), argon laser (514.5nm) etc.Wavelength peak is the red laser that 600nm is above and 800nm is following, can from the laser diode of He-Ne laser instrument (633nm), AlGaInP class (630nm～680nm), Kr laser (647nm) wait selection.

Then, (absorbing wavelength is about 630nm) uses as the body holographic recording medium with potassium bromide, uses with the spacing of the same method of said method with 12 μ m hologram is write.Ablation process carries out under liquid nitrogen temperature, is heated to 100 ℃ after the reconstruction of hologram, eliminates hologram.Except heating, use far infrared any heating means such as (wavelength are as more than the 800nm) of carbon dioxide gas laser (10.6nm) to utilize with well heater.

And, about the elimination of holographic interference fringes, show the example of the body holographic recording medium that uses potassium bromide, but be to use lamination as described above the situation of body holographic recording medium of rubidium chloride, sodium bromide, potassium fluoride also be same.In addition, writing also is with above-mentioned same.

Lens as optically focused first wave band (190nm is above and 380nm is following) laser for example can use three rich (Mitsutoyo) UV * 50 (NA0.4) etc.When NA than its hour, because the strength ratio little (concentration ratio is little) of Z-direction, so be difficult to write the specific Z shaft position of body holographic recording medium.

As the display surface that is used for the reconstruction of hologram, with general the same physical strength, anti-Ultra-Violet Laser impact and the environmental stability etc. of requiring of televisor.Above-mentioned alkali halide has the not high and bibulous characteristic of hardness, therefore preferably applies surface-coated on alkali halide, or forms alkali halide and glass support substrates is faced laterally on glass support substrates.Ultra-Violet Laser is exposed from alkali halide face side.

As mentioned above, based on the painted ionic crystal structure that comes from microcosmic of Ultra-Violet Laser, be monocrystal or fusion monocrystal so be used for that crystal on the display surface need not, also can be polycrystal or powder etc.Just no longer include scattering and on visible waveband, obtain transparent display surface if carry out single crystals, thereby can be used as transmission-type and use.

In addition, under the situation of the reflective holographic transcriber that is used to laser-bounce diffraction of light, interference from display surface, the supporting substrates with the material at look center as described above need not also can use aluminium oxide or silicon substrate etc. into transparent.Can be transmission-type or reflection-type according to hologram successively reproducing device, the method for making or the unijunction crystallinity of the material with look center by constituting display surface be controlled the crystal transparency.

Under the situation of described monocrystal, in grinding step, implement smoothing processing in order to make optical element as described above and transparency is improved.There is being the imaginary plane of certain depth to form hologram from the monocrystal surface, and then with a determining deviation this depth moved to form hologram, thereby finally forming the hologram of volume type.

In order to realize this point, preferably as described above after the wavelength of considering Ultra-Violet Laser or hologram position size, using the above and depth of focus of NA0.3 is that the following lens of 10 μ m carry out optically focused.Use these lens to make focus, expose, can form hologram having on the imaginary plane of certain depth in view of the above while display surface is moved with Ultra-Violet Laser with respect to Ultra-Violet Laser corresponding to display surface inside.

As the method that on substrate, forms crystal, can utilize based on the crystallization of evaporating solvent from strong solution or the formation of fuse salt, the various coatings of solution.Can also add polyvinyl alcohol (PVA) as required and wait coating or the bond strength of improving supporting substrates.In addition, can also use various adjuvants.Perhaps make material film forming on supporting substrates with look center by vapour deposition method.

As mentioned above, so, when formation has the material at look center on supporting substrates, make the outside (external world) of supporting substrates, do not make the defective that produces the mechanicalness defective or cause on the material with look center by moisture absorption towards hologram reproduction apparatus.Meanwhile, preferably make Ultra-Violet Laser directly to its irradiation.

In addition, in the body reconstruction of hologram of the present invention, as mentioned above,, shine the light of reading that its wavelength satisfies interference condition to scan the holographic interference fringes display surface that shows by Ultra-Violet Laser comprehensively.So, produces owing to Ultra-Violet Laser irradiation excite, painted part and other parts, it is different with refractive index to read the optical transmission rate, diffraction and interference takes place, reproduction reconstruction of hologram space image.Diffraction light from the display surface each point is synthesized the generation hologram image again in the space, and this is identical with general hologram, can obtain static space image.

Reconstruction of hologram space image looks and reveals or in the display surface back from display surface come-up, according to reading different and different that light and the position of display surface concern.But, when reading radiant and be positioned on the position opposite with respect to display surface, (be under the situation of reading the position relation that light must the transmission display surface) with observer one side, then to read light for this must be transparent to display surface.

Cathode-ray tube (CRT) in the past is opaque scatterer, and the material with look center has and can become this transparent feature, satisfies above-mentioned necessary condition.In addition, the material life-span at room temperature transition time from the excited state to ground state with look center of the present invention is long, can stably keep painted state, thus can be after the holographic interference fringes that has shown a frame amount with Ultra-Violet Laser, and light is read in irradiation all sidedly.

In addition, as mentioned above, compare with scanning,, can shorten each frame needed sweep time by carried out the Ultra-Violet Laser of intensity modulated respectively from a plurality of Ultra-Violet Laser light source irradiation with a branch of Ultra-Violet Laser.Scan if use planar VCSEL ultraviolet laser then do not need, so even more ideal.Existing people proposes to use semi-conductive light source as many Ultra-Violet Lasers light source like that with above-mentioned.

And the material that has the look center as described above also turns back to ground state owing to read the laser of light sometimes, but often also not exclusively.For example, a part of sometimes electronics is captured on the energy level at the F ' center that is known as once more.At this moment, preferably shine noncoherent long wavelength light of eliminating usefulness comprehensively.This is based on the elimination of above-mentioned secondary excitation light.

Had better make display surface be warming up to hundreds of ℃ as required promotes to eliminate.Can confirm to eliminate speed dependent in temperature.For example, potassium bromide crystal half life period τ at room temperature is the several seconds, is below 1 second in the time of 100 ℃, is tens of milliseconds in the time of 500 ℃.

As mentioned above, by carrying out these operations repeatedly, space image can be observed as motion video with certain cycle.If should the cycle long then picture as seen glimmer, its value was generally considered to be about a thirtieth second.

In the body reconstruction of hologram of the present invention, by the principle of the material with look center as can be known, painted is highly sensitive, show and the speed eliminated fast.

Even with in the ion of following molecule structure change or redox reaction moves, need energy and the photochromic material of time or electrochromism material and compare, material with look center of the present invention painted is owing to be to move with the same electronics of semiconductor switch, so can high-speed response.But also has good permanance repeatedly equally with semiconductor switch.

The hologram of the present invention of explanation in the embodiment 1 to 3 not only is used as the display of character display or image, also can be used as infromation recording/reproducing apparatus.

(embodiment)

Below, embodiments of the invention are described.

(embodiment 1)

In embodiment 1, as the alkali halide that constitutes display surface, the potassium bromide monocrystal that uses the infrared optics crystallization of the circle that is of a size of φ 30mm, thickness 3mm to use.Splitting surface (100) is write hologram.Fig. 6 represents to be used for the transmitted spectrum of Ultra-Violet Laser pre-irradiation (61) back (62) of the potassium bromide of display surface.

Use HIPPO-355Q (3 times of higher hamonic wave 355nm of the YAG) ultraviolet laser that pulsed laser writes as hologram of spectrophysics (Spectra Physics) company, vibrate with the 40KHz frequency.Luminous point is the ellipse of 2.5mm * 3.5mm.Adjust DPSS (diode pumping) to apply the energy that power makes 1 pulse be 0.54 μ J.

Use three rich system MPlunUV50 *, on above-mentioned display surface surface, light optically focused is become to be of a size of the luminous point of 1.13 μ m * 0.89 μ m.Display surface is fixed on the XY objective table, is main scanning direction with the long axis direction, writes a little with the width of the velocity sweeping 10mm of per second 1mm.Because the toggle frequency of Ultra-Violet Laser is 40kHz, so in 1 μ m, repeatedly write 40 points while move the position.With the short-axis direction is sub scanning direction, carries with the spacing of 10 μ m, and main sweep is come and gone 100 times, thereby depicts the blank of line and the 9 μ m of 200 about 1 μ m.

He-Ne Lasers (wavelength 633nm, spot diameter 2mm) is impinged perpendicularly on the diffraction grating described (interference fringe a kind of) as reading visible light.At this moment, the diffraction luminous point is observed more than 5 times, and diffracted intensity has more than 10% when peak value, but diffraction grating faded away within about 20 seconds, and diffracted intensity weakens gradually, and up to finding only remaining 0 light, diffraction no longer can be recognized.

And the exposure experiments of being undertaken by the Ultra-Violet Laser by means of non-optically focused finds, the optical absorption spectra that is formed centrally the position in the look on the present embodiment display surface has approximately from the broad absorption band of 500nm up to 700nm, and the peak value of absorption is about 630nm.For the basic rerum natura of clear and definite hologram, use diffraction grating to verify in the present embodiment.

(embodiment 2)

In embodiment 2, as the alkali halide that constitutes display surface, the potassium bromide monocrystal that uses the infrared optics crystallization of the circle that is of a size of φ 30mm, thickness 3mm to use.Splitting surface (100) is write hologram.

Use HIPPO-266Q (3 times of higher hamonic wave 266nm of the YAG) ultraviolet laser that pulsed laser writes as hologram of spectrophysics (Spectra Physics) company, vibrate with the 40KHz frequency.Luminous point is the ellipse of 2.2mm * 3.3mm.Adjust DPSS (diode pumping) to apply the energy that power makes 1 pulse be 0.21 μ J.

Use three rich system MPlunUV50 *, on above-mentioned display surface surface, light optically focused is become to be of a size of the luminous point of 0.95 μ m * 0.66 μ m.

Display surface is fixed on the XY objective table, is main scanning direction with the long axis direction, writes point group with the width of the velocity sweeping 10mm of per second 1mm.Because the toggle frequency of Ultra-Violet Laser is 40kHz, so in 1 μ m, repeatedly write 40 points while move the position.With the short-axis direction is sub scanning direction, carries with the spacing of 10 μ m, and main sweep is come and gone 100 times, thereby depicts the blank of line and the 9 μ m of 200 about 1 μ m.

When making the diffraction grating that He-Ne Lasers (wavelength 633nm, spot diameter 2mm) vertical incidence describes (interference fringe a kind of), the diffraction luminous point is observed more than 5 times, and diffracted intensity has more than 10% when peak value.If the Ultra-Violet Laser with 266nm writes potassium bromide, then find till eliminating for up to a few hours.For the basic rerum natura of clear and definite hologram, use diffraction grating to verify in the present embodiment.

(embodiment 3)

In embodiment 2, form diffraction grating with Ultra-Violet Laser, after reproducing the diffraction luminous point, blow 300 ℃ hot blast again with He-Ne Lasers, this moment, diffraction grating faded away within about 10 seconds, and diffracted intensity weakens gradually.In addition, find only remaining 0 light, diffraction no longer can be recognized.

In addition, by just the temperature of display surface being adjusted to 300 ℃ at first, diffraction grating disappeared within about 1 second, though the elimination speed at look center has temperature dependency, had found the time constant of practical level.

Through the inventor's further investigation, the result has confirmed that by other tests that the Ultra-Violet Laser by means of non-optically focused carries out the formation at look center does not have temperature dependency.In view of the above, even just the temperature of display surface is adjusted to 300 ℃ at first, the peak value of diffracted intensity also is 15% not change, but disappears within 1 second, has shown the possibility as dynamic hologram.

And as the Ultra-Violet Laser of embodiment 1, under the situation of using the 355nm Ultra-Violet Laser, as long as make temperature bring up to 100 ℃, diffraction grating will disappear within 1 second, and under the temperature higher than this, the diffraction luminous point was confirmed, is difficult to measure by moment.

(embodiment 4)

In embodiment 2, replace diffraction grating, on one side carry out Ultra-Violet Laser according to the data of computer hologram intensification modulation scan on one side, thereby on display surface, write holographic interference fringes.Make He-Ne Lasers (wavelength 633nm, spot diameter 2mm) when impinging perpendicularly on the holographic interference fringes of being described, reproducing three-dimensional still image.

(embodiment 5)

In embodiment 5, the face (100) that uses NaBr (sodium bromide) is as display surface.Fig. 7 represents the postradiation transmitted spectrum of the Ultra-Violet Laser of this display surface.The wavelength 633nm of the spacing of holographic interference fringes and He-Ne Lasers, wavelength 514nm and three kinds of corresponding holographic interference fringes of 488nm of argon laser are synthesized.And, Ultra-Violet Laser optically focused being become be of a size of the luminous point of 0.95 μ m * 0.66 μ m, the shape of the holographic interference fringes to this after synthetic scans the display holography interference fringe.

Be that spacing with 10 μ m scans in embodiment 1 and embodiment 2, but scan with the spacing of 1 μ m in the present embodiment.

Then, the reproduction of having amplified 633nm, 514nm and 488nm with lens with visible light after unified the irradiation.Because sodium bromide has absorption in wider wavelength coverage,, in view of the above, reproduce colored hologram so in these three kinds of optical maser wavelengths, transmission change and variations in refractive index are arranged also.

(embodiment 6)

In embodiment 6, the place has formed hologram in the display surface depth.The three rich system MPlunUV50 that in embodiment 2, use * operating distance be 12mm, focal length is 4mm.In the structure of embodiment 2, three rich system MPlunUV50 * lens are gone up in Z-direction (the laminated thickness direction of crystal) moved, make the position of focal position corresponding to the surface 100 μ m that leave display surface.

Optically focused becomes to be of a size of the luminous point of 0.95 μ m * 0.66 μ m.In this focal position, form hologram in the imaginary plane that constitutes with the XY2 dimension.This imaginary plane is the face (100) identical with cleave surface.When having formed diffraction grating similarly to Example 2, the diffraction efficiency of He-Ne brings up to 15%.

(embodiment 7)

In embodiment 7, these three kinds of crystal of rubidium chloride (633nm with), potassium chloride (514nm with), potassium fluoride (488nm with) are ground after being cut into the 1mm slab, and with they according to the said sequence lamination, engage after, formed display surface.Fig. 8 represents the postradiation transmitted spectrum of various Ultra-Violet Lasers.

Producing owing to laser radiation under the state of changes in optical properties, the lamination display surface is lamination as described below.That is, preferably lamination is the display surface that three kinds of alkali halides more than the 380nm and below the 500nm, more than the 500nm and below the 600nm and more than the 600nm and below the 800nm or alkaline-earth halide constitute by peak absorption wavelength.

In addition, the three rich system MPlunUV50 that in embodiment 2, use * operating distance be 12mm, focal length is 4mm.These lens are gone up in Z-direction (the laminated thickness direction of crystal) moved, thereby make the position of focal position corresponding to the inside 100 μ m in rubidium chloride surface that leave display surface.Optically focused becomes to be of a size of the luminous point of 0.95 μ m * 0.66 μ m.By carry out Ultra-Violet Laser scanning according to aforesaid hologram data, be formed for the holographic interference fringes of R look with 3 μ m spacings (point at interval).

Equally, be formed for the interference fringe of G look at the surperficial inside 100 μ m places of leaving potassium chloride with 2 μ m spacings, be formed for the interference fringe of B look (as Ultra-Violet Laser with 1 μ m spacing at the surperficial inside 100 μ m places of leaving potassium fluoride, as described above, it is above and 380nm following that wave band is taken as 190nm).

Then, the reproduction of having amplified 633nm, 514nm and 488nm with lens with visible light after unified the irradiation.Reproduction owing to diffraction, interference take place the holographic interference fringes that variations in refractive index and absorption are arranged in its wavelength, reproduces colored hologram with visible light in view of the above.

Use visible light as reproducing, preferably the illumination wavelength peak value be 380nm blueness, wavelength peak above and that 500nm is following be 500nm green, wavelength peak above and that 600nm is following be the above and redness below the 800nm of 600nm, these three kinds of wavelength color read light.

(embodiment 8)

In the structure of embodiment 7, RGB all scans with 1 μ m spacing, and a Pixel Dimensions maximum is taken as 20 μ m * 20 μ m, according to the data bitmap of non-solid the size of pixel is modulated into the demonstration that 16 grades are carried out non-stereo-picture.

(embodiment 9)

Embodiment 9-11 is the embodiment under the body reconstruction of hologram situation.As the alkali halide that constitutes display surface, the potassium bromide monocrystal that uses the infrared optics crystallization of the circle that is of a size of φ 30mm, thickness 3mm to use.Splitting surface (100) is write hologram.

Use the HIPPO-266Q of Spectra Physics Co. (4 times of higher hamonic wave 266nm of the YAG) ultraviolet laser that pulsed laser writes as hologram, vibrate with the 40KHz frequency.Luminous point is the ellipse of 2.2mm * 3.3mm.Adjust DPSS (diode pumping) to apply the energy that power makes 1 pulse be 0.21 μ J.

Use three rich system MPlunUV50 *, leaving above-mentioned display surface surface inwardly 2mm place optically focused one-tenth be of a size of the luminous point of 0.95 μ m * 0.66 μ m.

In this focal position, form hologram in the imaginary plane that constitutes with the XY2 dimension.This imaginary plane is the face (100) identical with cleave surface.

He-Ne Lasers (wavelength 633nm, spot diameter 2mm) is impinged perpendicularly on the diffraction grating described (interference fringe a kind of), and when going up, the diffraction luminous point is observed more than 5 times, and diffracted intensity has more than 10%.

And then, with Z axle objective table display surface is moved on depth direction with the spacing of 10 μ m, 100 the volume holograms that obtained on depth direction multiple recording based on the diffraction grating of above-mentioned XY scan exposure.

He-Ne Lasers based on volume hologram of the present invention (wavelength 633nm, spot diameter 2mm) vertical incidence diffraction of light intensity is brought up to more than 30%, and obviously volume hologram is than 2 dimension hologram diffraction efficiency height.For the basic rerum natura of clear and definite hologram, use diffraction grating to verify in the present embodiment.

(embodiment 10)

In embodiment 9, Yi Bian the temperature of volume type display medium is adjusted to 100 ℃, Yi Bian form diffraction grating with Ultra-Violet Laser, reproduce the diffraction luminous point with He-Ne Lasers simultaneously.So, diffraction grating faded away within about 30 seconds, and diffracted intensity weakens gradually, and up to remaining 0 light only, diffraction no longer can be recognized.

Through the inventor's further investigation, the result has confirmed that by other tests that the Ultra-Violet Laser by means of non-optically focused carries out the formation at look center does not have temperature dependency, and the elimination at look center has temperature dependency.In view of the above, even just the temperature of volume type display medium is adjusted to 100 ℃ at first, the peak value of diffracted intensity also is 30% not change, but disappears within 30 seconds, has shown the possibility as dynamic hologram.

(embodiment 11) hologram

In embodiment 9, replace diffraction grating, on one side carry out Ultra-Violet Laser according to the data of computer hologram intensification modulation scan on one side, thereby write holographic interference fringes.When the holographic interference fringes that He-Ne Lasers (wavelength 633nm, spot diameter 2mm) vertical incidence is described, reproduce three-dimensional still image.

More than, with reference to embodiment the present invention has been described, but should have thought that the present invention is not limited to the disclosed embodiments.The scope of appended claim makes it comprise the 26S Proteasome Structure and Function of all changes, equivalence corresponding to explaining the most widely.

Claims

1. a display device is characterized in that, comprising:

To write above-mentioned display element with data and export first light source of above-mentioned first wave band of laser in order to show;

2. display device according to claim 1 is characterized in that,

Above-mentioned display element has a plurality of above-mentioned layer that material that the peak absorption wavelength by light differs from one another constitutes.

3. display device according to claim 1 is characterized in that,

Above-mentioned first light source and secondary light source are made of a wavelength variable light source.

4. display device according to claim 1 is characterized in that,

Above-mentioned demonstration data are hologram datas.

5. a hologram reproduction apparatus is characterized in that, comprising:

Comprise optical characteristics owing to 190nm above and the alkali halide that change less than first wave band of laser irradiation of 380nm or the display element of alkaline-earth halide;

Be used for holographic interference fringes being write the writing station of above-mentioned display element by above-mentioned first wave band of laser irradiation;

To above-mentioned holographic interference fringes irradiation wave band is that second wave band more than the 380nm and below the 800nm is read the device that light reproduces holographic three-dimensional picture; And

Be used for light that illumination wavelength is equal to or greater than 700nm eliminating the cancellation element of above-mentioned holographic interference fringes,

The wherein reproduction that writes, utilizes the holographic three-dimensional picture that above-mentioned transcriber carries out by utilizing holographic interference fringes that above-mentioned writing station carries out repeatedly and utilize the elimination of the holographic interference fringes that above-mentioned cancellation element carries out to carry out the successively reproducing of holographic three-dimensional picture.

6. hologram reproduction apparatus according to claim 5 is characterized in that,

Above-mentioned holographic interference fringes writes above-mentioned display element based on hologram data with point data.

7. hologram reproduction apparatus according to claim 5 is characterized in that,

The irradiation of the irradiation of reading light of above-mentioned second wave band and above-mentioned first wave band of laser that above-mentioned display element is carried out is carried out from the same side.

8. hologram reproduction apparatus according to claim 5 is characterized in that,

Above-mentioned writing station forms above-mentioned holographic interference fringes on the imaginary plane of the depth direction that is specified in above-mentioned display element.

9. hologram reproduction apparatus according to claim 6 is characterized in that,

Switch stereo display and non-stereo display by the Pixel Dimensions that switches based on above-mentioned point data.

10. a hologram reproduction apparatus is characterized in that,

Above-mentioned ground floor, the second layer and the 3rd layer, the peak absorption wavelength under the state that optical characteristics changes owing to the laser radiation of above-mentioned first wave band differs from one another, and

Also comprise: the laser radiation that is used for by above-mentioned first wave band writes the writing station of above-mentioned display element with holographic interference fringes,

Be used for the transcriber that light reproduces holographic three-dimensional picture is read in the above-mentioned display element irradiation that has write above-mentioned holographic interference fringes, and

11. hologram reproduction apparatus according to claim 10 is characterized in that,

12. hologram reproduction apparatus according to claim 10 is characterized in that,

Use from wave band as the wavelength peak of selecting second wave band more than the 380nm and below the 800nm as more than the 380nm and below the 500nm, wavelength peak as more than the 500nm and below the 600nm and wavelength peak read light as three kinds more than the 600nm and below the 800nm, reproduce above-mentioned holographic three-dimensional picture at the above-mentioned display element that has write above-mentioned holographic interference fringes.

13. hologram reproduction apparatus according to claim 11 is characterized in that,

Switch stereo display and non-stereo display by switching the Pixel Dimensions that writes based on above-mentioned point data.