CN102661531A - Illumination unit, image reading apparatus and image forming apparatus - Google Patents
Illumination unit, image reading apparatus and image forming apparatus Download PDFInfo
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- CN102661531A CN102661531A CN2012100995966A CN201210099596A CN102661531A CN 102661531 A CN102661531 A CN 102661531A CN 2012100995966 A CN2012100995966 A CN 2012100995966A CN 201210099596 A CN201210099596 A CN 201210099596A CN 102661531 A CN102661531 A CN 102661531A
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Abstract
The present invention provides an illumination unit, an image reading apparatus and an image forming apparatus, which are capable of preventing generation of a shadow portion by raising of a surface of an original document, are downsized, and each have high efficiency of light use which does not lower the light concentration degree. The illumination unit, used for the image reading apparatus to illuminate a reading target area, is characterized by comprising a plurality of light sources arranged in the prescribed first direction and an optical member for guiding the light emitted from the light sources to the reading target area, wherein the optical member comprises a first reflective face and a second reflective face which are opposite to each other and both are planes.
Description
The application is based on dividing an application of following one Chinese patent application:
The original bill applying date: on 01 30th, 2008
Original bill application number: 200810005416.7
Original bill application title: image read-out and image processing system
Technical field
The present invention relates to a kind of image read-out that is used in digital copier or the image reading apparatus.
Technical background
In recent years, the development of light emitting diode (below be called LED) is being advanced energetically.The brightness of LED element increases apace.Normally, LED has such as long life-span, efficient, high resisting-G performance and monochromatic luminous advantage, makes people expect that it is applied to various illumination places.The for example application of a LED, LED is used in such as in the image read-out of digital copier or image reading apparatus and the original document lighting device.
Be used in the usage in the image read-out as LED, the whole bag of tricks is suggested.For example; In JP 2005-241681A, a large amount of LED is parallel to the main scanning direction on the surface of original document and arranges, through at main scanning direction optical effect not being provided; The light that LED sends is spread (diffuse); And through the optically focused effect at the reflecting surface of sub scanning direction, the light that LED sends is assembled, and makes that the lip-deep illumination intensity that reads the target area at original document increases.
And, in JP2693098B, through in photoconduction, repeating total reflection, the emergent light of LED be directed on the main scanning direction and in diffusion (diffuse) with the reflector space diffusion with reflect, the light that departs from from total reflection condition is shone the outside of photoconduction.In this way, the uniformity of illumination profile has strengthened on main scanning direction.
Further; In JP2004-361425A; A large amount of LED is parallel to the main scanning direction of original document and arranges; Light through not providing optical effect LED to send at main scanning direction is disperseed, and the light that the optically focused effect LED through the prism on sub scanning direction sends is assembled, and makes that the lip-deep illumination intensity that reads the target area at original document increases.
Yet if book that opens or analog are placed on the press sheet glass (document platen), because the structure of book or analog, the part between the page rises inevitably.For this reason, the rising part between the page with respect to press sheet glass shape at an angle.Because the formation shade, whole rising part with an angle can not be illuminated by light.Therefore, just a problem is arranged, the shade of black is read when reading original document.
Usually, described like JP2004-361425, utilize the light source that uses cold-cathode tube, through being disposed opposite to each other reflecting plate, can obtain light from the both direction in first area and the second area.In this case, begin from the path of light original document reflection and that be used to form images, the opposite side that light source side is defined as first area and light source is defined as second area.
Yet in the structure that JP2005-241681A describes, although the service efficiency of light can be enhanced through using reflecting surface, only side is illuminated from the first area on the surface of original document.Owing to assembled through reflecting surface from the light that LED sends,, almost do not had light to arrive the reflecting plate on opposite even the reflecting plate on opposite is placed on second area.For this reason, be practically impossible from the both direction illumination.If from the both direction illumination is to obtain through reducing concentration class, then the service efficiency of light has seriously been reduced.
And in the structure of in JP2683098B, describing, with respect to the method for arranging LED, the light emission measure of optical lighting system has been greatly diminished, and is limited because may be provided in the number of the LED in the photoconduction.Therefore, in the structure that JP2683098B describes, each zone that is desirably in first area and second area all provides optical lighting system, and to carry out the illumination of desired both direction, still this method cost is very high.
And in the structure that JP2004-361425A describes, the size of the whole optical lighting system on the first mirror direction of original document surface is tending towards increasing.
Summary of the invention
The above-mentioned problem of the present invention's consideration is made.Therefore; An object of the present invention is to provide the image processing system of the dash area that rising that a kind of image read-out and a kind of can prevent the original document surface produces, and a kind of image read-out and image processing system that size that high efficiency light do not reduce the light-ray condensing degree reduces that have is provided.Again, another object of the present invention provides a kind of do not reduce lighting unit, image read-out and image processing system the light-ray condensing degree, that have high light utilization ratio.
More specifically, be used to solve the problem of above-mentioned appointment and the lighting unit of the present invention, image read-out and the image processing system that provide have like following (1) to (5) described technical characterictic.
(1) a kind of lighting unit, it is used for image read-out, throws light on to reading the target area, it is characterized in that having: be arranged on a plurality of light sources on the direction of regulation; And will be directed to the optical component that reads the target area from the light that said light source sends, and said optical component comprises relative first reflecting surface and second reflecting surface with having angle each other, and said first reflecting surface and said second reflecting surface all are the planes.
(2) in the above lighting unit of describing in (1), the distance of said first reflecting surface and said second reflecting surface is along with before the direction of advance of the light that sends from said light source and then increase.
(3) in the above the lighting unit of describing in (1) or (2),
Have: first reflecting plate and second reflecting plate,
Said first reflecting surface is arranged on said first reflecting plate,
Said second reflecting surface is arranged on said second reflecting plate.
(4) a kind of image read-out, it has the lighting unit of each record in top (1)-(3).
(5) a kind of image processing system is characterized in that, (4) described image read-out above having.
[effect of invention]
According to the present invention, can constitute the dash area of the rising generation that can prevent the original document surface, small-sized and that do not reduce the light-ray condensing degree, that the light utilization ratio is high lamp optical system.
Again, the present invention can also provide a kind of do not reduce lighting unit, image read-out and image processing system the light-ray condensing degree, that the light utilization ratio is high.
Description of drawings
Above-mentioned and further feature of the present invention, aspect and advantage will be easier to understand with reference to following description, the claims and the accompanying drawing of appendix.
Fig. 1 is the sectional view on sub scanning direction of explanation according to the structure of first embodiment of image read-out of the present invention.
Fig. 2 is the sectional view on main scanning direction of explanation according to the structure of first embodiment of image read-out of the present invention.
Fig. 3 explains that the light that in according to first embodiment of image read-out of the present invention, sends from light emitting diode arrives the sketch map of the beeline r that reads the target area.
Fig. 4 explains in according to first embodiment of image read-out of the present invention from reading the sketch map of target area to the path of CCD (charge-coupled image sensor).
Fig. 5 is the sketch map of explanation according to the structure of first embodiment of image processing system of the present invention.
Fig. 6 is the sectional view on sub scanning direction of explanation according to the structure of second embodiment of image read-out of the present invention.
Fig. 7 is the sectional view on main scanning direction of explanation according to the structure of second embodiment of image read-out of the present invention.
Fig. 8 explains that the light that in according to second embodiment of image read-out of the present invention, sends from light emitting diode arrives the sketch map of the beeline r ' that reads the target area.
Fig. 9 is be configured in sectional view sub scanning direction on of explanation according to the 3rd embodiment of image read-out of the present invention.
Figure 10 is be configured in sectional view main scanning direction on of explanation according to the 3rd embodiment of image read-out of the present invention.
Figure 11 is the sectional view on sub scanning direction of explanation according to the structure of the 4th embodiment of image read-out of the present invention.
Figure 12 is the sectional view on main scanning direction of explanation according to the structure of the 4th embodiment of image read-out of the present invention.
Figure 13 is explanation according to the sectional view on the main scanning direction that is configured in of the lamp optical system of the section construction of the 5th embodiment of image read-out of the present invention.
Figure 14 is explanation according to the sectional view on the main scanning direction that is configured in of the version of the lamp optical system of the section construction of the 5th embodiment of image read-out of the present invention.
Figure 15 is be configured in sectional view sub scanning direction on of explanation according to the 6th embodiment of image read-out of the present invention.
Figure 16 is be configured in sectional view main scanning direction on of explanation according to the 6th embodiment of image read-out of the present invention.
Figure 17 is explanation has the opposition reflecting plate of parabolic in the 6th embodiment according to an image read-out of the present invention sketch map.
Figure 18 is be configured in sectional view sub scanning direction on of explanation according to the 7th embodiment of image read-out of the present invention.
The specific embodiment
Essential structure according to image processing system of the present invention and image read-out will be described below.In addition, because following embodiment is a preferable example of the present invention, technical favourable restriction is employed.Yet as long as do not limit scope of the present invention in the following description especially, the present invention is not limited only to these embodiment.
(image read-out)
Image read-out of the present invention comprises: the light source that illuminates the original document surface; The light that light source is sent guides to the lamp optical system that reads the target area with length and width; Imaging is from the imaging optical system of the light of original document surface reflection; Be provided at the sensor in the imaging moiety of imaging optical system, be used to read in the lip-deep original document image of original document.Lamp optical system comprises that one has the opticator of light-ray condensing effect and a large amount of reflecting parts.Be used to be provided with lamp optical system member the zone by one perpendicular to the original document surface, be parallel to length direction and pass the virtual plane that reads the target area and be divided into two zones, and at least one reflecting part is set at each zone.
[first embodiment]
Structure (in the cross section part on the sub scanning direction) according to first embodiment of image read-out of the present invention is described in Fig. 1,3.Structure (in the cross section part on the main scanning direction) according to first embodiment of image read-out of the present invention is described in Fig. 2.
Like Fig. 1,2 described, the light source of first embodiment and lamp optical system have following structure.
(light source)
LED 4 (* 5)
(lamp optical system)
Reflecting plate 1-a
Reflecting plate 1-b
Reflecting plate 1-c
Reflecting plate 1-d
Reflecting plate 2
Reflecting plate 3
(reflecting plate)
Reflecting plate all is the plane, and the optical component that is formed by reflecting plate 1-a, 1-b, 1-c, 1-d passes through adhesive bond.In this case, the reflecting plate that is bonded together is called as optical conductor.
(virtual plane, first area, second area)
In Fig. 1, direction and width that length direction is perpendicular to accompanying drawing are left and right directions in the accompanying drawings.
Virtual plane be one perpendicular to original document surface and be parallel to the plane of length direction, and also be one and pass the surface of reading target area 6.More particularly, virtual plane is defined as plane reflection by original document and that light that be used to form images passes.And when the zone of a member that is used to be provided with light source and lamp optical system is divided into two when regional by virtual plane, the zone that light source is set is that first area and the zone that light source is not set are second areas.
Fig. 1 explains the special case in present embodiment of the present invention.In Fig. 1, virtual plane is represented a line of demarcation as first area and second area.In LED 4, the optical component and the reflecting plate 2 that are formed by reflecting plate 1-a, 1-b, 1-c, 1-d are set at the first area, and reflecting plate 3 is set at second area.
In addition, among the embodiment below, virtual plane, the definition that first area and second area use is similar to the definition of using in the present embodiment of the present invention.More particularly, among the embodiment below, the arrangement of homotaxis in present embodiment of the present invention of virtual plane 7, first area and second embodiment is except that type of opticator etc. is changed.
(structure of image read-out)
On sub scanning direction, the light that LED 4 sends from the front surface direction of LED 4 to the light of external diffusion by effectively reflection, and through against each other and be parallel in the reflecting plate 1-a of length direction and the front surface direction that reflecting plate 1-b accumulates in LED 4.Reflecting plate 1-a respect to one another and reflecting plate 1-b are aligned to the spacing B that makes with an angle between the reflecting plate of emission side greater than the spacing A between the reflecting plate of the light approaching side that sends from light source.
On the contrary; On main scanning direction; Do not depart to the outside of reflecting plate 1-a respect to one another, 1-b because optical effect is provided for light, plate 1-c and reflecting plate 1-d reflect but the light that departs from is reflected, and are used for the illumination of original document effectively.
After this manner, the light that sends from the optical conductor of being made up of reflecting plate 1-a, 1-b, 1-c, 1-d is by 2 reflections of the reflecting plate on the first area, being directed to the original document surface, and also by 3 reflections of the reflecting plate on the second area to be directed to the original document surface.
In addition, reflecting plate 1-a and reflecting plate 1-b preferably are configured to an angle, thereby make the light exit direction be parallel to the original document surface.
According to top structure, because the light exit direction is parallel to the original document surface, light source and optical component are configured to be parallel to the original document surface.For this reason, be reduced perpendicular to the thickness on the original document surface direction of light source and lamp optical system.As a result, the image read-out size is reduced.
In addition, the desired spacing of light (being used for being equivalent to the illumination lack of uniformity of scanning direction the LED of minority) that is used for disperseing LED to send is the front surface direction (at the left and right directions of Fig. 1) of the light-emitting area of LED.In the present embodiment; When the light exit direction of LED 4 is parallel to original document surface (upper surface of the press sheet glass 5 among Fig. 1); Light is collected on the sub scanning direction through optical conductor, and light obtained by mirror, and image read-out can reduce size at the above-below direction of Fig. 1.In addition, outnumber 5 through what increase LED, image read-out can reduce size at the left and right directions of Fig. 2.At this moment, it becomes and can obtain high illumination intensity.In addition, owing to realized the illumination of both direction, even the part of original document has rising, shade can not occur.
When the light distribution of considering LED, through the angle of adjustment reflecting plate, as shown in Figure 1, the illumination intensity distribution on sub scanning direction is optimised.For example, thus can adjust near the smooth illumination intensity distribution quilt that obtains about 3mm the target area 6 reading.In this case, have curvature, can increase the design freedom of image read-out, make to form the more light mass distribution of expectation through making reflecting plate.
In addition; When calculating the desired value of spacing P between the light emitting diode when not having inhomogeneities on the main scanning direction that is reading target area 6 for illumination intensity, spacing r (light that sends from light emitting diode passes optical component, read the beeline of target area 6 by any one reflection a plurality of reflecting plates and arrival) is asked to.Can obtain spacing r through the path in Fig. 3 of first embodiment.
Through the spacing r that use to obtain, the formula 1 below utilizing can obtain not have the desired value of the spacing P between the light emitting diode of illumination unevenness property.
P≤1.3r ... (formula 1)
Fig. 4 be expression according to first embodiment of image read-out of the present invention from reading the sketch map of target area 6 to the path of Embodiment C CD (charge-coupled device).Light by reading target area 6 reflections passes virtual plane 7, and is read lens by a plurality of refrative mirror reflections to guide to.Pass the light that reads lens and be directed to CCD, make image information read by CCD.
(image processing system)
Fig. 5 is that expression comprises the ideograph of the image processing system of image read-out according to an embodiment of the invention.
In Fig. 5, symbol 100 presentation videos form device, 200 presentation video reading devices.Other symbols are directly quoted in specification.
In image read-out 200, original document 202 is placed on the press sheet glass 5, and original document 202 is held in place the illumination section illumination on first motion parts 203 below the press sheet glass 5.Reflected by the first mirror 203a of first motion parts 203 and then reflected from the light of original document 202 reflections by the first mirror 204a of second motion parts 204 and the second mirror 204b; The imaging len 205 that makes light be directed into to reduce, and imaging on the on-line sensor 206.In addition, under the situation of color image reader, through on each RGB color, line sensor 206 being provided, the present invention can be employed with identical construction.
Under the situation of the longitudinal direction that reads original document; First motion parts 203 moves on the right direction of Fig. 5 with speed V; And second motion parts 204 is mobile on right direction with the 1/2V speed of first motion parts 203; Make from original document 202 to line sensor 206 optical path length be held constant, and whole original document can be read with specific multiplication factor.
As the conventional usage of a kind of original document LED illumination device of in image read-out, using, a large amount of LED elements are with arrayed.
When carries out image formed, the latent image carrier 111 of photoconduction photoreceptor turned clockwise with constant speed.The surface of latent image carrier 111 is to be recharged roller 112 homogenizations ground charging, and is write to make public by the optics of the laser beam LB of light scanning apparatus 117 and form electrostatic latent image.The electrostatic latent image that forms comprises a so-called negative sub-image, and wherein image-region is made public, and a so-called positive sub-image, and wherein non-image areas is made public.Any one above-mentioned electrostatic latent image is used for electrostatic latent image through use on developing apparatus 113 the toner of development is by visual.In this case, a kind of image processing system that can form coloured image can obtain through 4 developing apparatus 113 altogether that correspond respectively to 4 kinds of color YMCK are provided.
The box that is used for storing transfer paper P is provided at the main body of image processing system 100 separably.Under attached state as shown in Figure 5, the transfer paper P that is stored in top is supplied to through paper feeding roller 120.The head portion of the transfer paper P that presents is resisted roller and is blocked 119.The opposing roller is sent to transfer section to 119 transfer paper P, and this moment, the toner image on latent image carrier 111 was transferred to transfer section.The transfer paper P that is transmitted is applied in toner image and receives the effect of transfer printing rod 114 on transfer section, toner image is by static printing.Be sent to fixing device 116 and toner image is fixed with the transfer paper P of toner image transfer printing in fixture 116.Transfer paper passes paper feed path 121, and is discharged to pallet 123 through the paper distributing roller to 122.The surface of latent image carrier 111 device 115 cleaning that after the toner image transfer printing, is cleaned, therefore remaining toner, paper end etc. are removed.
[second embodiment]
Structure (in the cross section part on the sub scanning direction) according to second embodiment of image read-out of the present invention is described in Fig. 6,8.Structure (in the cross section part on the main scanning direction) according to second embodiment of image read-out of the present invention is described in Fig. 4,7.
And shown in Fig. 6 and 7, the optical lighting system of second embodiment and the structure of light source are following.
(light source)
Light emitting diode 4 (* 5)
(lamp optical system)
Optical conductor 8
Reflecting plate 2
Reflecting plate 3
(reflecting plate, optical conductor)
Reflecting plate all is the plane, and the structure of second embodiment structure with first embodiment except optical conductor 8 is identical.The difference of the optical conductor between first embodiment and second embodiment is described below.
In the optical conductor of first embodiment,, visible reflectance is approximately 90% because final minute surface is generally the reflecting surface of the inexpensive reflecting plate that covers aluminium or the like.By comparison, the optical conductor 8 of second embodiment is formed by the material of for example glass and plastics, and realizes whole reflections of light.Therefore, the degree of reflection is approximately 100%.In this case, not too coarse minute surface is employed the reflecting surface of the optical conductor 8 of second embodiment to have the process polishing, makes the degree of reflection further reach 100%.If reflecting surface is a rough surface, it is more that loss from the teeth outwards becomes.Therefore people more expect the optical conductor 8 that plastics rather than glass are made, and are more convenient because processing is got up, and the weight of optical conductor 8 has also alleviated.
In addition, the optical conductor 8 of second embodiment is formed by 6 planes.The exit facet of the plane of incidence of light (near the LED among Fig. 64 surface) and the light surface of the reflecting plate among Fig. 62 (near) does not utilize whole reflections of light.Because the exit facet of the plane of incidence of light and light is the incident and the face of outgoing of carrying out light, they are not limited to only to have the plane of the surface configuration of high efficiency light use.Therefore, optical conductor 8 has all planes of reflection of 4 utilizations at least
Two planes in 4 planes are provided with relative to one another.Be aligned to by two planes positioned opposite to each other and make and to send spacing B ' between the plane of side greater than from the spacing A between the plane of the light approaching side of light source from light.
In addition, two planes positioned opposite to each other preferably are parallel to the length direction setting.
According to top structure, on sub scanning direction, the light that the front surface direction from LED 4 of the light that sends from LED 4 is disperseed is reflected effectively and is collected on the front surface direction of LED.
And except two planes positioned opposite to each other in 4 planes, two remaining planes preferably are parallel to length direction and perpendicular to the setting of original document surface direction.On main scanning direction, through top structure, the light that departs to the outside on two planes positioned opposite to each other is reflected, more effectively to be used for the illumination of original document.
In addition, when the desired value that calculates the spacing P ' between the light emitting diode, spacing r ' (by the conversion spacing of following formula 3 expressions) is asked to.
R '=r-∑ { Di (1-1/Ni) } ... (formula 3)
Spacing r ' can calculate from the path of Fig. 8 of second embodiment.
Use the spacing r ' that calculates, the desired value of the spacing P ' between the light emitting diode that does not possess illumination unevenness property that makes of requirement can use following formula 2 to calculate.
P '≤1.3r ' ... (formula 2)
In this case, it is different from first embodiment that light passes the medium (optical conductor 8) with refractive index.Spacing r ' can come out from the refractive index and the path computing of the optical conductor 8 of Fig. 4 through formula 3.
The 3rd embodiment
According to the structure (the cross section part on sub scanning direction) of the 3rd embodiment of image read-out of the present invention shown in Fig. 9.According to the structure (the cross section part on main scanning direction) of the 3rd embodiment of image read-out of the present invention shown in Figure 10.
In addition, shown in Fig. 9 and 10, the optical lighting system of the 3rd embodiment and the structure of light source are following.
(light source)
Light emitting diode 4 (* 5 unit)
(optical lighting system)
Reflecting part 9
Reflecting plate 2
Reflecting plate 3
(reflecting plate, reflecting part)
Reflecting plate all is the plane.They are the same with the structure of first embodiment except reflecting part 9.Because the function of reflecting part 9 is the same with the optical conductor of first embodiment, reflecting part 9 is described below.
Reflecting part 9 has curvature on sub scanning direction.It is a cylinder that on main scanning direction, does not have curvature.The shape of curved surface is a sphere or a parabola.The reflecting part has a light that sends from LED 4 and forwards the effect that approximately is parallel to the light on the sub scanning direction to.
[the 4th embodiment]
According to the structure (the cross section part on sub scanning direction) of the 4th embodiment of image read-out of the present invention shown in Figure 11.According to the structure (the cross section part on main scanning direction) of the 4th embodiment of image read-out of the present invention shown in Figure 12.
And shown in Figure 11 and 12, the optical lighting system of the 4th embodiment and the structure of light source are following.
(light source)
Light emitting diode 4 (* 5 unit)
(optical lighting system)
Lens 10
Reflecting plate 2
Reflecting plate 3
(reflecting plate, lens)
Reflecting plate all is the plane.They are the same with the structure of first embodiment except lens 10.Because the function of lens 10 is the same with the optical conductor of first embodiment, lens 10 are described below.
Lens 10 have curvature on sub scanning direction.It is a cylinder that on principal direction, does not have curvature.The shape of curved surface is a sphere or a parabola.Lens 10 have a light that sends from LED 4 and forward the effect that approximately is parallel to the light on the sub scanning direction to.
The 5th embodiment
The 5th embodiment is one and in first embodiment, has only the reformed embodiment of optical lighting system.The structure of lateral reflection plate and its effect will be introduced based on the structure of the 5th embodiment that describes among Figure 13 and Figure 14 in detail.
In order to illustrate the effect of lateral reflection plate (reflecting plate 1-d), in Figure 13, omit in the structure of the image read-out of reflecting plate 2,3 from Fig. 2.Yet in the present embodiment, device comprises like the reflecting plate of describing among Fig. 22,3, though they have omitted in Figure 13.
Shown in figure 13, the light that the main scanning direction that sends from LED is propagated is reflected by lateral reflection plate (reflecting plate 1-d).Thereby light is directed to as illumination light and reads the target area to effectively utilize more.
Figure 14 is further functional examples of applications of lateral reflection plate (reflecting plate 1-d).Shown in figure 14, reflecting plate 1-c (lateral reflection plate) positioned opposite to each other and reflecting plate 1-d (lateral reflection plate) are aligned to the relation that makes light comprise C＜D from the space D between the lateral reflection plate of spacing C between the lateral reflection plate of light source approaching side and light exit side with an angle.
Reflecting plate 1-c and reflecting plate 1-d are with the Rankine-Hugoniot relations that is parallel to front surface but be not configured to against each other.Through reflecting plate 1-c respect to one another and reflecting plate 1-d are arranged to can obtain with an angle two effects.An effect is that catoptrical loss alleviates on the press sheet glass surface, and the angle that reads the target area of press sheet glass becomes near vertically (surface of glass has the character of reflecting part incident light because light gets into fixedly.Usually, when the angle steepen of the incident light that gets into glass, the reflection flux on press sheet glass increases and illumination efficiency (light utilization rate) increases).Therefore, the quilt that sends from LED is used as the efficient of the light that illumination light is used to read, and just, on the light service efficiency, can be supposed to improve.Another effect is through the adjustment angle, and is shown in figure 14, and the amount of light that can be desirably in the marginal portion of reading the target area improves.
(the 6th embodiment)
According to the structure (the cross section part on sub scanning direction) of the 6th embodiment of image read-out of the present invention shown in Figure 15.According to the structure (the cross section part on main scanning direction) of the 6th embodiment of image read-out of the present invention shown in Figure 16.
In the 6th embodiment, in first embodiment, be configured to reflecting plate 1-a ' respect to one another, the shape of 1-b ' is configured to parabolic shape.Reflecting plate is parabolic shape in the longitudinal direction and on width, does not have curvature.Shown in figure 15, reflecting plate is a parabolic shape on the cross section of sub scanning direction.Through the light source of placement nearby in paraboloidal focus or it, the light that sends from light source and be reflected the face reflection becomes and is approximately directional light.
Figure 17 prolongs and intersects the view of the line segment of reflecting surface on the cross section of sub scanning direction.Naturally near the intersection point of light exit direction (near the right side of Figure 17) rather than line segment, light source is set at the intersection point near light exit direction rather than line segment to paraboloidal focus like this.
If reflecting surface is become similar and parabolic shape the 5th embodiment, to compare with first embodiment, the light that sends from light source becomes and further approaches directional light.For this reason, though the light service efficiency increases, changing reflecting surface is the cost height of the manufacturing cost of parabolic shape than the plane.Therefore, considering manufacturing cost, a kind ofly be employed to be similar to the example that paraboloidal angle is provided with the method on plane.
And the technical idea based on becoming the reflecting surface of the reflecting plate respect to one another of present embodiment parabolic shape can become parabolic shape to the reflecting surface of optical conductor.Verified, use the optical conductor of the reflecting surface of parabolic shape can obtain the effect the same with present embodiment.
And, through being that paraboloidal invention combines with the reflecting surface that changes optical conductor, can obtain the raising of light service efficiency about the technical idea of the alignment arrangements of lateral reflection face among the 5th embodiment.That is to say that in the marginal portion of the length direction on two planes respect to one another, side plane is configured to each plane and is disposed opposite to each other.A pair of side plane positioned opposite to each other is aligned to an angle, makes from the space D between the side plane of spacing C ' between the lateral reflection plane of light source light incident side and light exit side ' satisfy the relation of C '＜D '.
[the 7th embodiment]
Structure (in the cross section part on the sub scanning direction) according to the 7th embodiment of image read-out of the present invention is described in Figure 18.In the 7th embodiment, the reflecting plate 2 of first embodiment is changed the curved surface like reflecting plate 2 ' and reflecting plate 3 ' with reflecting plate 3.Through changing reflecting plate is curved surface, is only had with reflecting plate 3 ' by the reflecting plate 1-a of first embodiment and the total light aggtegation of the 1-b plate 2 ' that can be reflected.The raising of reading the illumination intensity of target area can be supposed to.
Yet through adopting such configuration, in the illumination intensity distribution on sub scanning direction, the field of illumination narrows down uniformly.For this reason, if the field of illumination with read the target area because foozle etc. makes does not overlap, worry that the illumination intensity that reads the target area sharply descends.But when manufacture process in stable state and needn't consider this worry the time, the configuration of the 7th embodiment is worthy of consideration.
Image processing system and image read-out according to first embodiment to the, seven embodiment; Can be prevented by the original document surface dash area that causes that rises, and the image processing system that reduces size can be provided and have the high light line service efficiency and do not weaken the image read-out of light-ray condensing degree.
The present invention can prevent the dash area that risen and to be caused by original document, also can construct a kind of high light line service efficiency simultaneously and not weaken the optical lighting system that the size of light-ray condensing degree reduces.
Even more suitably embodiment of the present invention is described and explains, will be appreciated that these are example of the present invention rather than restriction in the above.Increase, deletion, replacement and other modifications can be carried out under the situation that does not break away from essence of the present invention or scope.Therefore, the present invention can not limited by top description, and is only limited by claims of appendix.
Claims (6)
1. lighting unit, it is used for image read-out, throws light on to reading the target area, it is characterized in that having:
Be arranged on a plurality of light sources on the direction of regulation; And
To be directed to the optical component that reads the target area from the light that said light source sends,
Said optical component comprises relative first reflecting surface and second reflecting surface with having angle each other,
Said first reflecting surface and said second reflecting surface all are the planes.
2. lighting unit as claimed in claim 1 is characterized in that, the distance of said first reflecting surface and said second reflecting surface is along with before the direction of advance of the light that sends from said light source and then increase.
3. lighting unit as claimed in claim 1 is characterized in that having:
First reflecting plate and second reflecting plate,
Said first reflecting surface is arranged on said first reflecting plate,
Said second reflecting surface is arranged on said second reflecting plate.
4. lighting unit as claimed in claim 2 is characterized in that having:
First reflecting plate and second reflecting plate,
Said first reflecting surface is arranged on said first reflecting plate,
Said second reflecting surface is arranged on said second reflecting plate.
5. an image read-out is characterized in that, has the lighting unit of each record among the claim 1-4.
6. an image processing system is characterized in that, has the described image read-out of claim 5.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007021630 | 2007-01-31 | ||
| JP2007-021630 | 2007-01-31 | ||
| JP2007092343A JP5282368B2 (en) | 2007-01-31 | 2007-03-30 | Image reading apparatus and image forming apparatus |
| JP2007-092343 | 2007-03-30 | ||
| CN2008100054167A CN101237507B (en) | 2007-01-31 | 2008-01-30 | Image reading apparatus and image forming apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100054167A Division CN101237507B (en) | 2007-01-31 | 2008-01-30 | Image reading apparatus and image forming apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102661531A true CN102661531A (en) | 2012-09-12 |
| CN102661531B CN102661531B (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100054167A Active CN101237507B (en) | 2007-01-31 | 2008-01-30 | Image reading apparatus and image forming apparatus |
| CN201210099596.6A Active CN102661531B (en) | 2007-01-31 | 2008-01-30 | Illumination unit, image reading apparatus and image forming apparatus |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100054167A Active CN101237507B (en) | 2007-01-31 | 2008-01-30 | Image reading apparatus and image forming apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (3) | JP5282368B2 (en) |
| CN (2) | CN101237507B (en) |
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| CN110678789A (en) * | 2017-05-22 | 2020-01-10 | 大日本印刷株式会社 | Lighting device |
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Also Published As
| Publication number | Publication date |
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| JP2008209879A (en) | 2008-09-11 |
| CN102661531B (en) | 2015-07-01 |
| CN101237507A (en) | 2008-08-06 |
| CN101237507B (en) | 2012-06-13 |
| JP2015008466A (en) | 2015-01-15 |
| JP5787122B2 (en) | 2015-09-30 |
| JP2012098748A (en) | 2012-05-24 |
| JP5282368B2 (en) | 2013-09-04 |
| JP5610160B2 (en) | 2014-10-22 |
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