CN102661531B - 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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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 the divisional application based on following 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 be used in digital copier or image reading apparatus.
Technical background
In recent years, the development of light emitting diode (hereinafter referred to LED) is advanced energetically.The brightness of LED element increases rapidly.Normally, LED has such as longer life-span, efficient, high anti-G performance and monochromatic luminous advantage, and people are expected, and it is applied to various illumination places.The such as application of a LED, in the image read-out that LED is used in such as digital copier or image reading apparatus and original document lighting device.
Be used in the usage in image read-out as LED, various method is suggested.Such as, in JP 2005-241681A, a large amount of LED is parallel to the main scanning direction arrangement on the surface of original document, by not providing optical effect at main scanning direction, the light that LED sends is diffused (diffuse), and by the optically focused effect at the reflecting surface of sub scanning direction, the light that LED sends is aggregated, and makes the illumination intensity of the reading target area on the surface of original document increase.
And, in JP2693098B, by repeating total reflection in photoconduction, the emergent light of LED is directed on main scanning direction and in diffusion (diffuse) and reflector space diffusion with reflect, the light departed from from total reflection condition is shone the outside of photoconduction.In this way, on main scanning direction, the uniformity of illumination profile enhances.
Further, in JP2004-361425A, a large amount of LED is parallel to the main scanning direction arrangement of original document, disperseed by the light not providing optical effect LED to send at main scanning direction, the light sent by the optically focused effect LED of the prism on sub scanning direction is aggregated, and the illumination intensity of the reading target area on the surface of original document is increased.
But if a book opened or analog are placed on press sheet glass (document platen), due to the structure of book or analog, the part between the page inevitably rises.For this reason, the rising part between the page relative to press sheet glass shape at an angle.Because formation shade, whole rising part with an angle can not be illuminated by light.Therefore, just have a problem, when reading original document, the shade of black is read.
Usually, described by JP2004-361425, utilize the light source using cold-cathode tube, by reflecting plate is disposed opposite to each other, the light from the both direction in first area and second area can be obtained.In this case, that reflect from original document and for the light of imaging path, light source side is defined as first area and the opposite side of light source is defined as second area.
But in the structure that JP2005-241681A describes, although the service efficiency of light can be enhanced by using reflecting surface, the surface of original document is only illuminated from side, first area.Because the light sent from LED is aggregated by reflecting surface, even if the reflecting plate on opposite is placed on second area, light is not almost had to arrive the reflecting plate on opposite.For this reason, be practically impossible from both direction illumination.If be obtain by reducing concentration class from both direction illumination, then the service efficiency of light is seriously reduced.
And in the structure described in JP2683098B, relative to the method for arrangement LED, the light emission measure of optical lighting system has been greatly diminished, because the number that may be provided in the LED in photoconduction is limited.Therefore, in the structure that JP2683098B describes, each region being desirably in first area and second area provides optical lighting system, and to carry out the illumination of desired both direction, but this method cost is very high.
And, in the structure that JP2004-361425A describes, be tending towards increasing from the size of the whole optical lighting system the first mirror direction, original document surface.
Summary of the invention
The present invention considers that above-mentioned problem manufactures.Therefore, an object of the present invention is to provide the image processing system of a kind of image read-out and a kind of dash area that can prevent the rising on original document surface from producing, and provide a kind of have high efficiency light do not reduce light-ray condensing degree size reduce image read-out and image processing system.Again, another object of the present invention is to provide a kind of that do not reduce light-ray condensing degree, that have high light utilization ratio lighting unit, image read-out and image processing system.
More specifically, the lighting unit of the present invention, image read-out and the image processing system that provide for solving above-mentioned problem of specifying have the technical characteristic as below described by (1) to (5).
(1) lighting unit, it is for image read-out, throws light on, it is characterized in that having: be arranged on the multiple light sources on a direction of regulation to reading target area; And the light sent from described light source being directed to the optical component reading target area, described optical component comprises the first reflecting surface and the second reflecting surface that tool is relative angularly each other, and described first reflecting surface and described second reflecting surface are all planes.
(2) lighting unit described in (1) above, the distance of described first reflecting surface and described second reflecting surface is along with before the direction of advance to the light sent from described light source and then increase.
(3) lighting unit described in (1) or (2) above,
Have: the first reflecting plate and the second reflecting plate,
Described first reflecting surface is arranged on described first reflecting plate,
Described second reflecting surface is arranged on described second reflecting plate.
(4) image read-out, the lighting unit recorded any one of (1)-(3) above it has.
(5) image processing system, is characterized in that, the image read-out above having described in (4).
[effect of invention]
According to the present invention, can form can prevent the rising on original document surface from producing dash area, small-sized and do not reduce light-ray condensing degree, lamp optical system that light utilization ratio is high.
Again, the present invention can also provide a kind of that do not reduce light-ray condensing degree, that light utilization ratio is high lighting unit, image read-out and image processing system.
Accompanying drawing explanation
Above-mentioned and further feature, aspect and advantage of the present invention will be easier to understand with reference to claims of description below, annex and accompanying drawing.
Fig. 1 is the sectional view on sub scanning direction of the structure of the first embodiment illustrated according to image read-out of the present invention.
Fig. 2 is the sectional view on main scanning direction of the structure of the first embodiment illustrated according to image read-out of the present invention.
Fig. 3 illustrates that the light sent from light emitting diode in the first embodiment of image read-out according to the present invention arrives the schematic diagram of the beeline r reading target area.
Fig. 4 illustrates in the first embodiment of image read-out according to the present invention from reading the schematic diagram of target area to the path of CCD (charge-coupled image sensor).
Fig. 5 is the schematic diagram of the structure of the first embodiment illustrated according to image processing system of the present invention.
Fig. 6 is the sectional view on sub scanning direction of the structure of the second embodiment illustrated according to image read-out of the present invention.
Fig. 7 is the sectional view on main scanning direction of the structure of the second embodiment illustrated according to image read-out of the present invention.
Fig. 8 illustrates that the light sent from light emitting diode in the second embodiment of image read-out according to the present invention arrives the schematic diagram of the beeline r ' reading target area.
Fig. 9 is the sectional view be configured on sub scanning direction of the 3rd embodiment illustrated according to image read-out of the present invention.
Figure 10 is the sectional view be configured on main scanning direction of the 3rd embodiment illustrated according to image read-out of the present invention.
Figure 11 is the sectional view on sub scanning direction of the structure of the 4th embodiment illustrated according to image read-out of the present invention.
Figure 12 is the sectional view on main scanning direction of the structure of the 4th embodiment illustrated according to image read-out of the present invention.
Figure 13 is the sectional view be configured on main scanning direction that the lamp optical system constructed according to the part of the 5th embodiment of image read-out of the present invention is described.
Figure 14 is the sectional view be configured on main scanning direction of the version that the lamp optical system constructed according to the part of the 5th embodiment of image read-out of the present invention is described.
Figure 15 is the sectional view be configured on sub scanning direction of the 6th embodiment illustrated according to image read-out of the present invention.
Figure 16 is the sectional view be configured on main scanning direction of the 6th embodiment illustrated according to image read-out of the present invention.
Figure 17 illustrates the schematic diagram in the 6th embodiment of image read-out according to the present invention with the opposition reflecting plate of parabolic.
Figure 18 is the sectional view be configured on sub scanning direction of the 7th embodiment illustrated according to image read-out of the present invention.
Detailed description of the invention
Essential structure according to image processing system of the present invention and image read-out will be described below.In addition, because the following examples are preferably examples of the present invention, technically favourable restriction is employed.But as long as be not particularly limited scope of the present invention in the following description, the present invention is not limited only to these embodiments.
(image read-out)
Image read-out of the present invention comprises: the light source illuminating original document surface, the light sent by light source guides to the lamp optical system of the reading target area with length and width, imaging is from the imaging optical system of the light of original document surface reflection, be provided in the sensor in the imaging moiety of imaging optical system, for reading in the original document image on original document surface.Lamp optical system comprises one and has the opticator of light-ray condensing effect and a large amount of reflecting parts.For the component of lamp optical system is set region by one perpendicular to original document surface, be parallel to length direction and be divided into two regions through the virtual plane reading target area, and at least one reflecting part is arranged on each region.
[the first embodiment]
Structure (section on sub scanning direction) according to the first embodiment of image read-out of the present invention describes in Fig. 1,3.Structure (section on main scanning direction) according to the first embodiment of image read-out of the present invention describes in fig. 2.
Described by Fig. 1,2, the light source of the 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 is all plane, and the optical component formed by reflecting plate 1-a, 1-b, 1-c, 1-d is combined by adhesive.In this case, the reflecting plate be bonded together is called as optical conductor.
(virtual plane, first area, second area)
In FIG, length direction is perpendicular to the direction of accompanying drawing and width is left and right directions in the accompanying drawings.
Virtual plane is one and is parallel to the plane of length direction perpendicular to original document surface, and be also one through the surface of reading target area 6.More particularly, virtual plane be defined as being reflected by original document and the plane of passing for the light of imaging.And when being divided into two regions for the region arranging the component of light source and lamp optical system by virtual plane for one, the region arranging light source is first area and the region not arranging light source is second area.
Fig. 1 explains the special case in the present embodiment of the present invention.In FIG, virtual plane represents a line of demarcation as first area and second area.In LED 4, the optical component formed by reflecting plate 1-a, 1-b, 1-c, 1-d and reflecting plate 2 are arranged on first area, and reflecting plate 3 is arranged on second area.
In addition, in the following embodiments, virtual plane, the definition that first area and second area use is similar to the definition used in the present embodiment of the present invention.More particularly, in the following embodiments, the arrangement of the homotaxis of virtual plane 7, first area and the second embodiment in the present embodiment of the present invention is except the type etc. of opticator is changed.
(structure of image read-out)
On sub scanning direction, the light from the front surface direction of LED 4 to external diffusion of the light that LED 4 sends effectively is reflected, and by toward each other and be parallel to the reflecting plate 1-a of length direction and reflecting plate 1-b and be gathered in the front surface direction of LED 4.Reflecting plate the 1-a respect to one another and reflecting plate 1-b spacing B be aligned between the reflecting plate making emission side is with an angle greater than the spacing A between the reflecting plate of the light approaching side sent from light source.
On the contrary, on main scanning direction, depart to the outside of reflecting plate 1-a, 1-b respect to one another because optical effect is not provided for light, but the light departed from is reflected by reflecting plate 1-c and reflecting plate 1-d, and be effectively used to the illumination of original document.
After this manner, the light sent from the optical conductor be made up of reflecting plate 1-a, 1-b, 1-c, 1-d is reflected by the reflecting plate 2 first area, to be directed to original document surface, and is also reflected to be directed to original document surface by the reflecting plate 3 on second area.
In addition, reflecting plate 1-a and reflecting plate 1-b is preferably configured to an angle, thus makes light exit direction be parallel to original document surface.
According to structure above, because light exit direction is parallel to original document surface, light source and optical component are configured to be parallel to original document surface.For this reason, be reduced perpendicular to the thickness in the original document surface direction of light source and lamp optical system.As a result, image read-out size is reduced.
In addition, for disperse LED to send light required by spacing (for the illumination lack of uniformity of scanning direction being equivalent to the LED of minority) be the front surface direction (left and right directions in FIG) 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 in Fig. 1), light is collected on sub scanning direction by optical conductor, and light is obtained by mirror, and image read-out can reduce size at the above-below direction of Fig. 1.In addition, by increasing the number of LED more than 5, 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 achieving the illumination of both direction, even if a part for original document has rising, shade there will not be.
When considering the Light distribation of LED, by adjusting the angle of reflecting plate, as shown in Figure 1, the illumination intensity distribution on sub scanning direction is optimised.Such as, can carry out adjusting thus read the smooth illumination intensity distribution quilt obtaining about 3mm near target area 6.In this case, by making reflecting plate have curvature, the design freedom of image read-out can be increased, making to form the light quality distribution more expected.
In addition, when calculating the desired value of spacing P between light emitting diode in order to illumination intensity does not have inhomogeneities on the main scanning direction reading target area 6, spacing r (light sent from light emitting diode passes optical component, reflected and arrive the beeline reading target area 6 by any one multiple reflecting plate) is required.Spacing r can be obtained by the path in Fig. 3 of the first embodiment.
By using the spacing r obtained, utilizing formula 1 below, the desired value of the spacing P between the light emitting diode without illumination unevenness can be obtained.
P≤1.3r ... (formula 1)
Fig. 4 is the schematic diagram from reading target area 6 to the path of Embodiment C CD (charge-coupled device) of the first embodiment represented according to image read-out of the present invention.Virtual plane 7 is passed by reading the light reflected target area 6, and by multiple refrative mirror reflection to guide to reading lens.Be directed to CCD through the light reading lens, image information is read by CCD.
(image processing system)
Fig. 5 is the ideograph representing the image processing system comprising image read-out according to an embodiment of the invention.
In Figure 5, symbol 100 represents image processing system, and 200 represent image read-out.Other symbols are directly quoted in the description.
In image read-out 200, original document 202 is placed on press sheet glass 5, and the illumination section illumination on original document 202 is held in place below press sheet glass 5 the first motion parts 203.The light reflected from original document 202 is reflected by the first mirror 203a of the first motion parts 203 and is then reflected by the first mirror 204a of the second motion parts 204 and the second mirror 204b, light is made to be directed into the imaging len 205 of reduction, and imaging on on-line sensor 206.In addition, when color image reader, by providing line sensor 206 in each RGB color, the present invention can be employed with identical structure.
When reading the longitudinal direction of original document, first motion parts 203 moves on the right direction of Fig. 5 with speed V, and the second motion parts 204 moves on right direction with the 1/2V speed of the first motion parts 203, make to be kept constant from original document 202 to the optical path length of line sensor 206, and whole original document can be read with specific multiplication factor.
As a kind of LED common usage of the original document lighting device used in image read-out, a large amount of LED element is with arrayed.
Image processing system 100 has the latent image carrier 111 of drum type, and around it, has the charging roller 112 as charging device, image developing apparatus 113, transfer roll 114 and cleaning device 115." corona-type charger " can be used as charging device.And photoscanner 117 example of such as image reading component is provided in image processing system, thus perform optical scanning once the information being received externally original document by laser beam LB.Exposed by optics write between charging roller 112 and image developing apparatus 113.
When performing image and being formed, the latent image carrier 111 of photoconduction photoreceptor rotates with constant clockwise direction.Being charged by charging roller 112 homogenization in the surface of latent image carrier 111, and is write by the optics of the laser beam LB of light scanning apparatus 117 and carry out exposure and form electrostatic latent image.The electrostatic latent image formed comprises a so-called negative sub-image, and wherein image-region is exposed, and a so-called positive sub-image, and wherein non-image areas is exposed.Any one above-mentioned electrostatic latent image is used for the development of electrostatic latent image on developing apparatus 113 toner by use is visualized.In this case, a kind of image processing system that can form coloured image can by providing 4 developing apparatus 113 altogether of corresponding respectively to 4 kinds of color YMCK and obtaining.
Box for storing transfer paper P is provided in the main body of image processing system 100 separably.Under attached state as shown in Figure 5, the transfer paper P being stored in top is supplied to by paper feeding roller 120.The tip portion of the transfer paper P of feeding is resisted roller and is blocked 119.Opposing roller is sent to transfer section to 119 transfer paper P, and the toner image now on latent image carrier 111 is transferred to transfer section.On transfer section, be applied in toner image by the transfer paper P transmitted and be subject to the effect of transfer printing rod 114, toner image is by static printing.Fixing device 116 is sent to and toner image is fixed in fixture 116 with the transfer paper P of toner image transfer printing.Transfer paper through paper feed path 121, and is discharged to pallet 123 by paper ejection rollers to 122.Surface cleaned device 115 after toner image transfer printing of latent image carrier 111 cleans, and therefore remaining toner, paper end etc. are removed.
[the second embodiment]
Structure (section on sub scanning direction) according to the second embodiment of image read-out of the present invention describes in Fig. 6,8.Structure (section on main scanning direction) according to the second embodiment of image read-out of the present invention describes in Fig. 4,7.
And, as shown in Figures 6 and 7, the optical lighting system of the second embodiment and being constructed as follows of light source.
(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 is all plane, and the structure of the second embodiment is identical with the structure of the first embodiment except optical conductor 8.The difference of the optical conductor between the first embodiment and the second embodiment is described below.
In the optical conductor of the first embodiment, because final minute surface is generally the reflecting surface of the inexpensive reflecting plate covering aluminium etc., 90% is approximately to visible reflectance.By comparison, the optical conductor 8 of the second embodiment is formed by the material of such as glass and plastics, and realizes whole reflections of light.Therefore, the degree of reflection is approximately 100%.In this case, the reflecting surface of the optical conductor 8 of the second embodiment is employed to have the minute surface not too coarse through polishing, makes the degree reflected reach 100% further.If reflecting surface is rough surface, loss from the teeth outwards becomes more.Therefore people more expect the optical conductor 8 of plastics instead of glass manufacture, because processing is got up more convenient, and the weight of optical conductor 8 also mitigates.
In addition, the optical conductor 8 of the second embodiment is formed by 6 planes.The plane of incidence (surface closest to the LED 4 in Fig. 6) of light and the exit facet (surface closest to the reflecting plate 2 in Fig. 6) of light do not utilize whole reflections of light.Because the exit facet of the plane of incidence of light and light performs the incidence of light and the face of outgoing, they are not limited to the plane only with the surface configuration that high efficiency light uses.Therefore, optical conductor 8 at least has the plane that 4 are used all reflections
Two planes in 4 planes are arranged relative to one another.By positioned opposite to each other two planes, the spacing B ' be aligned between the plane making to send side from light is greater than from the spacing A between the plane of the light approaching side of light source.
In addition, two planes positioned opposite to each other are preferably parallel to length direction and arrange.
According to structure above, on sub scanning direction, the light that the front surface direction from LED 4 of the light sent from LED 4 disperses effectively is reflected and is collected at the front surface direction of LED.
And except the plane that two in 4 planes are positioned opposite to each other, two remaining planes are preferably parallel to length direction and arrange perpendicular to original document surface direction.On main scanning direction, by structure above, the light that the outside to positioned opposite to each other two planes is departed from is reflected, with the illumination more effectively for original document.
In addition, when calculating the desired value of the spacing P ' between light emitting diode, spacing r ' (the conversion spacing represented by formula 3 below) is required.
R '=r-∑ { Di (1-1/Ni) } ... (formula 3)
Spacing r ' can calculate from the path of Fig. 8 of the second embodiment.
Use the spacing r ' calculated, the desired value of the spacing P ' do not possessed between the light emitting diode of illumination unevenness that makes of requirement can use formula 2 below to calculate.
P '≤1.3r ' ... (formula 2)
In this case, it is different from light through first embodiment of medium (optical conductor 8) with refractive index.Spacing r ' can by formula 3 from the refractive index of the optical conductor 8 of Fig. 4 and path computing out.
3rd embodiment
Shown in Figure 9 according to the structure (section on sub scanning direction) of the 3rd embodiment of image read-out of the present invention.Shown in Figure 10 according to the structure (section on main scanning direction) of the 3rd embodiment of image read-out of the present invention.
In addition, as shown in Figures 9 and 10, the 3rd optical lighting system of embodiment and being constructed as follows of light source.
(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 is all plane.Except reflecting part 9, they are the same with the structure of the first embodiment.Because the function of reflecting part 9 is the same with the optical conductor of the first embodiment, reflecting part 9 is described below.
Reflecting part 9 has curvature on sub scanning direction.It is a cylinder on main scanning direction without curvature.The shape of curved surface is a sphere or a parabola.Reflecting part has the effect light sent from LED 4 being forwarded to the light be approximately parallel on sub scanning direction.
[the 4th embodiment]
Shown in Figure 11 according to the structure (section on sub scanning direction) of the 4th embodiment of image read-out of the present invention.Shown in Figure 12 according to the structure (section on main scanning direction) of the 4th embodiment of image read-out of the present invention.
And, as shown in FIG. 11 and 12, the 4th optical lighting system of embodiment and being constructed as follows of light source.
(light source)
Light emitting diode 4 (× 5 unit)
(optical lighting system)
Lens 10
Reflecting plate 2
Reflecting plate 3
(reflecting plate, lens)
Reflecting plate is all plane.Except lens 10, they are the same with the structure of the first embodiment.Because the function of lens 10 is the same with the optical conductor of the first embodiment, lens 10 are described below.
Lens 10 have curvature on sub scanning direction.It is a cylinder in a main direction without curvature.The shape of curved surface is a sphere or a parabola.Lens 10 have the effect light sent from LED 4 being forwarded to the light be approximately parallel on sub scanning direction.
5th embodiment
5th embodiment be one in a first embodiment only have the reformed embodiment of optical lighting system.Structure and its effect of lateral reflection plate will be introduced in detail based on the structure of the 5th embodiment described in Figure 13 and Figure 14.
In order to illustrate the effect of lateral reflection plate (reflecting plate 1-d), in fig. 13, reflecting plate 2,3 omits from the structure of the image read-out Fig. 2.But in the present embodiment, device comprises the reflecting plate 2,3 as described in Fig. 2, although they eliminate in fig. 13.
As shown in figure 13, the light that the main scanning direction sent from LED is propagated is reflected by lateral reflection plate (reflecting plate 1-d).Thus light is directed to reading target area more to effectively utilize as illumination light.
Figure 14 is the example of further functional application of lateral reflection plate (reflecting plate 1-d).As shown in figure 14, reflecting plate 1-c (lateral reflection plate) positioned opposite to each other and reflecting plate 1-d (lateral reflection plate) is aligned to and makes light comprise the relation of C < D from the spacing C between the lateral reflection plate of light source approaching side and the space D between the lateral reflection plate of light exit side with an angle.
Reflecting plate 1-c and reflecting plate 1-d is to be parallel to the Rankine-Hugoniot relations of front surface but not to be configured to toward each other.By reflecting plate 1-c respect to one another and reflecting plate 1-d being arranged to can obtain two effects with an angle.Effect alleviates in the loss of press sheet glass reverberation on the surface, because the angle that light enters the reading target area of fixing press sheet glass becomes close to vertical, (surface of glass has the character of reflecting part incident light.Usually, when entering the angle steepen of incident light of glass, the reflection flux on press sheet glass increases and illumination efficiency (light utilization rate) increases).Therefore, what send from LED is used as the efficiency of light of illumination light for reading, and namely, light service efficiency can be supposed to improve.Another effect is by adjustment angle, and as shown in figure 14, the amount of light that can be desirably in the marginal portion of reading target area improves.
(the 6th embodiment)
Shown in Figure 15 according to the structure (section on sub scanning direction) of the 6th embodiment of image read-out of the present invention.Shown in Figure 16 according to the structure (section on main scanning direction) of the 6th embodiment of image read-out of the present invention.
In the sixth embodiment, the shape being configured to reflecting plate 1-a ', 1-b ' respect to one another is in a first embodiment configured to parabolic shape.Reflecting plate is parabolic shape in the longitudinal direction and does not have curvature in the direction of the width.As shown in figure 15, reflecting plate is parabolic shape on the cross section of sub scanning direction.By at paraboloidal focus or its light source of placement nearby, from light source send and become by the light of reflective surface and be approximately directional light.
Figure 17 be extend and intersect sub scanning direction cross section on the view of line segment of reflecting surface.Paraboloidal focus is naturally close to the intersection point of light exit direction (right side close to Figure 17) instead of line segment, and such light source is arranged on the intersection point close to light exit direction instead of line segment.
If reflecting surface is become parabolic shape that is similar and the 5th embodiment, compared with the first embodiment, the light sent from light source becomes further close to directional light.For this reason, although light service efficiency increases, change reflecting surface is that the manufacturing cost of parabolic shape is higher than the cost of plane.Therefore, considering manufacturing cost, a kind of example arranging the method for plane to be similar to paraboloidal angle is employed.
And, based on the technical idea reflecting surface of the reflecting plate respect to one another of the present embodiment being become parabolic shape, the reflecting surface of optical conductor can be become parabolic shape.Verified, use the optical conductor of the reflecting surface of parabolic shape can obtain the effect the same with the present embodiment.
And, by by being that paraboloidal invention combines about the technical idea be arranged in lateral reflection face in the 5th embodiment and the reflecting surface of change optical conductor, the raising of efficiency of light can be obtained.That is, in the marginal portion of the length direction of two planes respect to one another, side plane is configured to each plane and is disposed opposite to each other.A pair side plane positioned opposite to each other is aligned to an angle, makes from the spacing C ' between the lateral reflection plane of light source incidence side and the space D between the side plane of light exit side ' meet the relation of C ' < D '.
[the 7th embodiment]
Structure (section on sub scanning direction) according to the 7th embodiment of image read-out of the present invention describes in figure 18.In the 7th embodiment, the reflecting plate 2 of the first embodiment and reflecting plate 3 are changed to the curved surface as reflecting plate 2 ' and reflecting plate 3 '.Being curved surface by changing reflecting plate, only can being had by reflecting plate 2 ' and reflecting plate 3 ' by the light aggtegation that reflecting plate 1-a and 1-b of the first embodiment is total.The raising of reading the illumination intensity of target area can be supposed to.
But by adopting such configuration, in the illumination intensity distribution on sub scanning direction, uniform field of illumination narrows.For this reason, if field of illumination and reading target area make not overlap due to foozle etc., worry that the illumination intensity reading target area sharply declines.But when manufacture process is in stable state and when need not consider this worry, the configuration of the 7th embodiment is worthy of consideration.
According to the first embodiment to the image processing system of the 7th embodiment and image read-out, can be prevented by the rise dash area that causes of original document surface, and can provide and subtract undersized image processing system and there is high light line service efficiency and do not weaken the image read-out of light-ray condensing degree.
The present invention can prevent from being risen the dash area caused by original document, also can construct a kind of high light line service efficiency and the optical lighting system that reduces of the size not weakening light-ray condensing degree simultaneously.
Even if more suitably embodiment of the present invention is described above and explains, it will be appreciated that these are example of the present invention instead of restriction.Increase, deletion, replacement and other amendments can be carried out when not departing from essence of the present invention or scope.Therefore, the present invention can not be limited by description above, and is only limited by claims of annex.
Claims (3)
1. a lighting unit, it is for image read-out, throws light on, it is characterized in that having to reading target area:
Be arranged on the multiple light sources on a direction of regulation; And
The light sent from described light source is directed to the optical component reading target area by the reflex by means of only reflecting surface,
Described optical component comprises the first reflecting surface and the second reflecting surface that tool is relative angularly each other,
Described first reflecting surface and described second reflecting surface are all planes,
The distance of described first reflecting surface and described second reflecting surface along with before the direction of advance to the light sent from described light source and then increase,
Distance the direction of advance of the light of the one end from light source side to one end of exiting side of described first reflecting surface and described second reflecting surface than described first reflecting surface on exit end and the distance the second reflecting surface,
Described lighting unit has the first reflecting plate and the second reflecting plate, and described first reflecting surface is arranged on described first reflecting plate, and described second reflecting surface is arranged on described second reflecting plate,
Described lighting unit meets following conditional:
P≦1.3·r
Wherein P is the spacing between described multiple light source, and r is that the light sent from described light source passes described optical component, reflected and arrive the beeline of described reading target area by any one described first reflecting plate and described second reflecting plate.
2. an image read-out, is characterized in that, has lighting unit according to claim 1.
3. an image processing system, is characterized in that, has image read-out according to claim 2.
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 |
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| CN102661531A CN102661531A (en) | 2012-09-12 |
| CN102661531B true CN102661531B (en) | 2015-07-01 |
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| 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 |
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| CN2008100054167A Active CN101237507B (en) | 2007-01-31 | 2008-01-30 | Image reading apparatus and image forming apparatus |
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| JP (3) | JP5282368B2 (en) |
| CN (2) | CN101237507B (en) |
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| JP5100468B2 (en) * | 2007-05-15 | 2012-12-19 | キヤノン株式会社 | Image forming apparatus |
| JP5232683B2 (en) * | 2009-02-20 | 2013-07-10 | 京セラドキュメントソリューションズ株式会社 | Image reading apparatus and image forming apparatus |
| JP5332725B2 (en) * | 2009-02-26 | 2013-11-06 | 株式会社リコー | Document illumination apparatus and image reading apparatus using the same |
| JP5359370B2 (en) * | 2009-02-26 | 2013-12-04 | 株式会社リコー | Document illumination apparatus and image reading apparatus using the same |
| JP5355261B2 (en) * | 2009-07-07 | 2013-11-27 | 株式会社日立ハイテクノロジーズ | Proximity exposure apparatus, exposure light forming method for proximity exposure apparatus, and display panel substrate manufacturing method |
| JP5071495B2 (en) * | 2010-03-04 | 2012-11-14 | ウシオ電機株式会社 | Light source device |
| JP5994229B2 (en) * | 2011-10-11 | 2016-09-21 | 株式会社リコー | Illumination unit, document reading apparatus, and image forming apparatus |
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2007
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| JP2015008466A (en) | 2015-01-15 |
| JP2012098748A (en) | 2012-05-24 |
| CN101237507B (en) | 2012-06-13 |
| JP5787122B2 (en) | 2015-09-30 |
| CN102661531A (en) | 2012-09-12 |
| CN101237507A (en) | 2008-08-06 |
| JP2008209879A (en) | 2008-09-11 |
| JP5282368B2 (en) | 2013-09-04 |
| JP5610160B2 (en) | 2014-10-22 |
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