CN101325640B - Illumination unit, image reading apparatus and forming apparatus using the illumination unit - Google Patents
Illumination unit, image reading apparatus and forming apparatus using the illumination unit Download PDFInfo
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- CN101325640B CN101325640B CN2008101249139A CN200810124913A CN101325640B CN 101325640 B CN101325640 B CN 101325640B CN 2008101249139 A CN2008101249139 A CN 2008101249139A CN 200810124913 A CN200810124913 A CN 200810124913A CN 101325640 B CN101325640 B CN 101325640B
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Abstract
An illumination unit can well inhibit the light collection of the light source and the image can be well read by using the illumination unit even during reading the float section of the manuscript. The illumination unit is provided with a plurality of light sources that emit illumination light from minute area towards the illuminated part. In the plane containing the light source and the illuminated part, the light source is disposed outside the perpendicular area in the perpendicular direction with respect to the illuminated part.
Description
Technical field
The present invention relates to a kind of to the lighting unit of original copy irradiates light and image-reading device and the image forming apparatus that uses this lighting unit; More particularly, relate to and a kind ofly use image-forming component in the components of photo-electric conversion, to dwindle into picture to read the digital picture fetch equipment, digital copier or the like of original copy information and be used for lighting unit wherein such as CCD or the like.
Background technology
Therefore the spot of the xenon lamp that in the past used, Halogen lamp LED or the like causes the temperature of equipment integral to rise because the power that consumes usually is big and heating is big.Temperature in the image-reading device rises and causes following problem: the conjugate relation collapse of optical system, focus departs from so that not imaging from the components of photo-electric conversion, can not obtain preferable image.
Therefore, as the new lighting source of the spot that substitutes xenon lamp or the like, use the lighting unit of the few led light source of consumed power and heating noticeable.
As the lighting unit that uses led light source, for example, in patent documentation 1, put down in writing and arranged a row LED, via the throw light on lighting unit of original copy of optical conductor.And, in the patent documentation 2 of known technology, put down in writing before the LED that the arranges long size lens combination of configuration as other, improve to the arrangement of the LED lighting unit of the illumination light harvesting degree of the direction of orthogonal mutually.In patent documentation 3, put down in writing through reflecting illumination light with the primary event mirror lighting unit of irradiation original copy from LED as other known technology.
Even using spot and adopting under the situation of lighting unit of LED, about the illumination in above-mentioned image-reading device, as shown in Figure 1 from the many directions of the reverberation of original copy among the light of original copy reflection, i.e. normal reflection direction does not generally read.Reason is in the normal reflection direction, the reverberation composition (normal reflection light composition) from original copy is arranged not only, and contains a lot of the insides from document board reverberation composition of (contact glass 1 is following among Fig. 1).Therefore, not only also incide in the components of photo-electric conversion, cause reading images well from the reverberation composition of original copy and the reverberation composition of document board the inside.
Therefore, lighting unit disposes the original copy that throws light on respect to the original copy face tilt, among the reverberation from original copy, generally reads the reverberation composition with respect to original copy face vertical direction.According to such formation, can eliminate catoptrical influence from the document board the inside.
Yet; Even under the situation of sunset illumination; When as shown in Figure 2, for example, when carrying out reading of certain special angle; As when reading the bookbinding part of book or the like, the normal reflection light composition that shines the light of the bending part (bookbinding part) that is positioned at apart from document board position far away penetrates along the vertical direction of original copy table top.Therefore, normal reflection light composition directly gets into the components of photo-electric conversion, and its light quantity catoptrical light quantity when reading original copy is usually compared excessive, therefore, has read the image that produces hickie.
And in the lighting unit that uses LED, the picture of LED self is read by image-reading device, and is as shown in Figure 3, and white dirt appears near the image the bookbinding part of the original copy of book or the like, causes the problem that can not read original copy information well.
Under the situation of the spot of xenon lamp or the like, owing to be diffused light source, therefore this phenomenon is difficult to take place, yet under the situation of strong LED of directive property or the like, this phenomenon takes place easily.And, as times transducer such as grade of closing-type, under the shallow situation of the depth of focus of equimultiple imaging element self; Even use strong LED of directive property or the like, also be difficult to take place the problem of this phenomenon, yet; It in the optical system of the dark reduction system of the depth of focus phenomenon that can realize; And, under the situation of strong original copy of gloss or the like, be the phenomenon that can significantly realize.
[patent documentation 1] spy opens the 2006-025303 communique
[patent documentation 2] spy opens the 2005-278132 communique
[patent documentation 3] spy opens the 2005-241681 communique
Summary of the invention
The technical problem that the present invention will solve
Therefore, the present invention makes in view of the above problems, and purpose is the lighting unit that provides following; Promptly; Even reading under the situation of floating part of original copy, also can suppress the light harvesting of light source well, particularly; Even be used to dwindle under the situation of optical system, also can read well to obtain image.
The technological means that the technical solution problem is adopted
The result of inventor's research is to solve the problems referred to above through following lighting unit, completion the present invention.The present invention provide at least a kind of be arranged with a plurality of towards the lighting unit of illuminated part from the light source of small area irradiates light; It is characterized in that; In the imaginary plane that comprises said light source and said illuminated part; Outside with respect to the vertical line zone on the vertical line direction of said illuminated part, dispose said light source.
That is, the lighting unit of the present invention that is used to address the above problem and image-reading device that adopts this lighting unit and image forming apparatus specifically have the technical characterictic of putting down in writing in following (1) to (10).
(1): a kind of be arranged with a plurality of to the lighting unit of illuminated part from the light source of small area irradiates light; Said a plurality of light source is LED; In the imaginary plane that comprises said a plurality of light source and said illuminated part, said a plurality of light sources are configured in respect to outside the vertical line zone on the vertical line direction of said illuminated part.
According to said structure, can prevent that the normal reflection light composition when the zig zag plane that runs into such as the bookbinding of book part or the like the time is incident under the state of the components of photo-electric conversion, the white dirt that is caused by normal reflection light takes place.In addition,, compare, can realize high light utilization ratio and low consumpting power with the spot of xenon lamp or the like through above-mentioned formation.
(2): the lighting unit of above-mentioned (1) record also has following characteristics, and said imaginary plane has two zones by said vertical line area dividing, and said light source is configured among any in said two zones.
Through to illuminated part from two-side lighting, can make illumination light quantity homogeneous.
(3): the lighting unit of above-mentioned (2) record also has following characteristics, and said light source disposes similar number respectively in said two zones.
Through to illuminated part from both sides the light illumination by similar number, can make illumination light quantity homogeneous.
(4): the lighting unit of above-mentioned (1) record also has following characteristics, in said lighting unit, disposes mirror or optical conductor.
Through above-mentioned formation, owing to can therefore can throw light on expeditiously the light light harvesting of light source to illuminated part.
(5): the lighting unit of above-mentioned (4) record also has following characteristics, and said vertical line zone is equipped with said mirror or optical conductor, and the reflecting surface that mirror that disposes in the said vertical line zone or optical conductor have is a minute surface.
Through above-mentioned formation, can prevent white dirt.
(6): the lighting unit of above-mentioned (1) record also has following characteristics, and so that LED is as excitaton source arbitrarily, the White LED of fluorescent look is sent out in use.
Through using White LED, can read and obtain the needed color information of full color image formation.And, occurrence of color infiltration when reading color information, the deterioration that is caused by white dirt is remarkable, yet, in lighting unit of the present invention, under the situation of the light of wavelength arbitrarily, can prevent white dirt.
(7): the lighting unit of above-mentioned (1) record also has following characteristics, arranges the LED of a plurality of colors respectively, constitutes white illumination.
Through using the LED of a plurality of colors, through the light source of employing, can improve the light utilization ratio with the corresponding color of each filter of red (R), green (G) of the components of photo-electric conversion, blue (B), read the image information of full color.Common LED is not limited to 3 colors because wavelength band is narrow as light source cell, has also increased other color, can improve the reproducibility of the color information of original copy information.And, occurrence of color infiltration when reading color information, the deterioration that is caused by white dirt is remarkable, yet, in lighting unit of the present invention, under the situation of the light of wavelength arbitrarily, can prevent white dirt.
(8): a kind of image-reading device comprises: document board, dispose original copy; Lighting unit is to the original copy irradiates light; The components of photo-electric conversion read the image of original copy; Image-forming component to the reverberation imaging from original copy, wherein, adopts the lighting unit of any record in above-mentioned (1) to (7) at these components of photo-electric conversion.
Through adopting lighting unit of the present invention; Compare with the spot of in the past xenon lamp or the like; Because the utilization ratio of light is high; Therefore can realize low consumpting power and low heating, and, can realize even still can carry out the image-reading device that image reads well in the bookbinding part of the thick original copy of book or the like.
(9): a kind of image forming apparatus, the image-reading device that is equipped with above-mentioned (9) to be put down in writing.
Through in image forming apparatus, adopting lighting unit of the present invention; In the low consumpting powerization that realizes image forming apparatus, under the situation of the thick original copy that duplicates book or the like, still can even bind the image forming apparatus that partly carries out preferable image output even can realize.
The technique effect that the present invention realizes
According to the present invention, even the image-reading device and the image forming apparatus that also can suppress the light harvesting of light source well and can obtain the lighting unit of good reading images and use this lighting unit under the situation of floating part of original copy reading can be provided.
Description of drawings
Fig. 1 is the skeleton diagram of structure that the side of lighting unit in the past is shown;
The bookbinding part of book reads in the lighting unit of Fig. 2 explanation structure in the past;
Fig. 3 illustrates the reading images of book in the lighting unit of structure in the past;
Fig. 4 is the skeleton diagram in the path of irradiates light in the lighting unit that illustrates in the past;
Fig. 5 is the skeleton diagram that the structure of the side of first embodiment in the lighting unit of the present invention is shown;
Fig. 6 illustrates the imaginary plane of first embodiment in the lighting unit of the present invention and the skeleton diagram in vertical line zone;
Fig. 7 comprises Fig. 7 A and Fig. 7 B; Fig. 7 A is illustrated in light source to be in LED under the situation in the vertical line zone, original copy face, image-forming component, and the skeleton diagram of the relation of the components of photo-electric conversion, and Fig. 7 B is illustrated in light source to be in LED under the extra-regional situation of vertical line, original copy face, image-forming component, and the skeleton diagram of the relation of the components of photo-electric conversion;
Fig. 8 is the skeleton diagram that is illustrated in the path of irradiates light among first embodiment of lighting unit of the present invention;
Fig. 9 is the skeleton diagram that is illustrated in the path of irradiates light in the variant of first embodiment of lighting unit of the present invention;
Figure 10 is the skeleton diagram that the illuminating effect of being realized by the structure of first embodiment (disposing LED by among any of two zones of vertical line area dividing) is shown;
Figure 11 is the skeleton diagram that is illustrated in the path of irradiates light in the reference example of lighting unit;
Figure 12 is the skeleton diagram that is illustrated in the path of irradiates light among second embodiment of lighting unit of the present invention;
Figure 13 is the skeleton diagram that is illustrated in the path of irradiates light in the variant of second embodiment of lighting unit of the present invention;
Figure 14 is the skeleton diagram that the structure of image-reading device of the present invention is shown; And
Figure 15 is the skeleton diagram that the structure of image-reading device of the present invention is shown.
The drawing reference numeral explanation
1 contact glass
2 original copys
3 first carriers
3A LED
The 3B reflector
3C first mirror
4 second carriers
4A second mirror
4B the 3rd mirror
5 images read lens
6 line sensors
6A, 6B, the 6C components of photo-electric conversion
200 image-reading devices
1100 photoreceptors
1110 charging rollers
1130 developing apparatuses
1140 transcription bands
1150 cleaning equipments
1160 fixation facilities
1170 optical scanning devices
1180 boxes
1190 alignment rolls are right
1200 image processing section
1210 pallets
1220 paper feed rollers
S autogtaphic printing paper (recording medium)
Embodiment
Below about lighting unit of the present invention and use the image-reading device of this lighting unit and the basic comprising of image forming apparatus to describe.
And the execution mode that hereinafter is discussed is the preferred embodiments of the present invention, thereby has technical desirable various qualifications, yet scope of the present invention is not limited to be used for specifically limiting record of the present invention in the explanation of hereinafter, also is not limited to these embodiment.
(lighting unit)
Before the structure of explanation lighting unit of the present invention, at first utilize accompanying drawing to describe about in the past lighting unit.
Fig. 4 is the skeleton diagram of the structure of scanner optics system in the lighting unit that illustrates in the past, and is as shown in Figure 2, and normal reflection light composition incides the components of photo-electric conversion.The original copy face and the components of photo-electric conversion (photo detector) are in conjugate relation, and in this case, in components of photo-electric conversion the place ahead, LED has the position (LED image planes) that forms conjugate relation.White dirt takes place thus.
[first embodiment]
As stated; Owing in the lighting unit in the past white dirt takes place, therefore lighting unit of the present invention has following characteristic, arranges a plurality of to the light source of illuminated part from the small area irradiates light; Said a plurality of light source is LED; Wherein, in the imaginary plane that comprises light source and illuminated part, said a plurality of light sources are configured in respect to outside the vertical line zone on the vertical line direction of said illuminated part.
At this, Fig. 5 is the skeleton diagram of structure that first embodiment of lighting unit of the present invention is shown.
The lighting unit of present embodiment forms following structure, arranges a plurality of LED 3A as light source, and the light that shines from this LED 3A reflects the illuminated part of irradiation by mirror 7.
And; First embodiment and after second embodiment and the lighting unit among the 3rd embodiment stated be the structure that possesses LED 3A and mirror 7; Yet; For illumination functions is described, as required, diagram and explanation original copy 2, as the contact glass 1, the first mirror 3C, image-forming component 5 that dispose the document board of this original copy 2, and components of photo-electric conversion 6 or the like.
Fig. 6 is imaginary plane and the regional skeleton diagram of vertical line that first embodiment of lighting unit of the present invention is shown.And this imaginary plane is positioned at position shown in dotted lines in Figure 5.
Imaginary plane is to comprise as the LED 3A of light source and plane as the original copy 2 (and contacting glass 1) of illuminated part; For example as shown in Figure 6, be with original copy 2 and extended line thereof be the top, with respect in the drawings lower direction of original copy 2, comprise the plane of the rectangular shape of a plurality of LED 3A that arranged.
The vertical line zone is the vertical line direction with respect to original copy 2 in the said imaginary plane and contact glass 1.For example, shown in black among Fig. 6, be the zone represented with respect to the vertical line of illuminated part.
Compare under the situation of abundant weak point with conjugate length in the distance from LED 3A to the original copy face, when shown in Fig. 7 A, light source is in the vertical line zone time; LED 3A is disposed in the vertical line scope; White dirt then takes place, and when shown in Fig. 7 B, light source is outside the vertical line zone time; LED 3A forms images outside photo detector, then can prevent white dirt.Even have distance between LED 3A and the original copy face, separate from the vertical line zone through making light source, can prevent white dirt.
Fig. 8 is the skeleton diagram of structure that first embodiment of lighting unit of the present invention is shown.
In the present embodiment, each LED 3A light source is positioned at outside the vertical line zone, towards illuminated part.Therefore, the illuminated part of throwing light on efficiently simultaneously can prevent white dirt.
In order to prevent white dirt, make illumination light quantity homogeneous simultaneously, hope to dispose light source respectively in two zones that utilize the vertical line zone to be divided.
And Fig. 9 is the skeleton diagram of structure of variant that first embodiment of lighting unit of the present invention is shown.
The characteristic of variant example is, do not make from the direction of a plurality of LED 3A irradiations of being disposed all parallel, but direction arbitrarily.Constitute according to this, can revise by image and read the low of peripheral light amount that lens cause.
Under being configured in LED 3A by the situation in two zones of vertical line area dividing one-sided, compare with the side of configuration LED 3A, in the side of not configuration occur easily the throwing light on difference of light quantity, the homogeneous of the light quantity that is difficult to realize to throw light on.And, when shown in figure 10 when the bookbinding part of book or the like is arranged, through illumination from two zones, the bookbinding part of also can throwing light on.And, identical through making by the number of the said light source in two zones of vertical line area dividing, realize the homogeneous of illumination light quantity easily.
Therefore, hope in the vertical line zone configuration as the mirror of minute surface, if in the vertical line zone configuration scattering part then become the reason that white dirt takes place.
And, through in light source, using LED 3A, compare with the spot of xenon lamp or the like, can realize high efficiency and low consumpting power.
[second embodiment]
Figure 12 is the skeleton diagram of structure that second embodiment of lighting unit of the present invention is shown, and Figure 13 is the skeleton diagram of structure of variant that second embodiment of lighting unit of the present invention is shown.
In the present embodiment, change that the configuration of LED 3A and mirror 7 comes to illuminated part irradiates light among first embodiment, can therefore can carry out high efficiency illumination to illuminated part light harvesting through having mirror 7.
But because if white dirt then takes place configuration mirror 7 shown in figure 11, therefore, like Figure 12 and shown in Figure 13, the virtual image that is necessary to make the light source that is caused through reflection is outside the vertical line zone.
And, can replace mirror 7 and the outfit optical conductor.At this, optical conductor is to utilize total reflection the optical element of the photoconduction that gets into from an end to other end.
[the 3rd embodiment]
The structure of the 3rd embodiment except LED is identical with first embodiment.
Present embodiment can read in order to obtain the needed color information of full color image formation through using White LED.And, occurrence of color infiltration when reading color information, the deterioration that is caused by white dirt is obvious, and the lighting unit of the application of the invention all can alleviate white dirt under the situation of the light of any wavelength.
And; Through replacing the light source that White LED adopts a plurality of colors; Through the light source of employing, improve the light utilization ratio, and can read the image information of full color with the corresponding color of each filter of red (R), green (G) of the components of photo-electric conversion, blue (B).Therefore usually, LED 3A is not limited to 3 colors as light source cell because wavelength band is narrow, increases other color and can improve the reproducibility of the color information of original copy information.And, occurrence of color infiltration when reading color information, the deterioration that causes owing to white dirt is remarkable, and the lighting unit of the application of the invention under the situation of the light of any wavelength, can alleviate white dirt.
(image-reading device)
Figure 14 is the skeleton diagram of structure that an embodiment of image-reading device of the present invention is shown.
In Fig. 1; Original copy 2 plane earths with the image that should read are placed in as on the contact glass 1 of " document board "; Bottom at contact glass 1 can dispose the lighting unit of the present invention as lighting device, the lighting unit of putting down in writing among first embodiment in the above-mentioned lighting unit of configuration in the image-reading device of present embodiment.Lighting unit has at a plurality of LED 3A and the reflector 3B that arrange with the direction of drawing orthogonal, make " with the slit shape part of the direction of drawing orthogonal " illumination.
From the reverberation (reverberation of image) of the illuminated part of original copy 2 after by the first mirror 3C reflection that is arranged at first carrier 3; Reflect successively by the second mirror 4A that is arranged at second carrier 4, the 3rd mirror 4B; Read lens 5 through image, on photographic plane, be imaged as the downscaled images of original image as the line sensor 6 of the components of photo-electric conversion.First to the 3rd mirror 3C, 4A, 4B constitute " reflective optics ".
The translational speed of first, second carrier is than being " V: V/2 ", and therefore, " reading the optical path length of lens from the original copy part of illuminated scanning to image " remains unchanged.
And this image-reading device is the equipment with the full color reading images, has at image to read " color decomposer (filter of the red, green, blue that is provided with among the said 3 line CCD) " that is provided with in the imaging optical path of lens 5.
And; Other embodiment as image-reading device; Integrated each other " original copy on the butt joint contact glass stitches lighting device, line sensor, the formation of shape illumination and reads lens from the illuminated part of original copy to a plurality of mirrors of the imaging optical path of line sensor, the image that disposes at said imaging optical path ", form reading unit, can implement this reading unit as follows; That is,, original copy reads scan manuscript through relatively being advanced.
" color decomposition " can also be used to read at image and insert selectively between lens and the line sensor (CCD) that color decomposes prism or filter so that method and " the making the method for the bright original copy that throws light on of light source of R, G, B successively " of decomposing by red (R), green (G), blue (B) color except that above-mentioned.
(image forming apparatus)
Figure 15 is the skeleton diagram of structure that a kind of execution mode of image forming apparatus of the present invention is shown.
This image forming apparatus has the image-reading device 200 that places the drawing its upper side and places " image forming portion " of its underpart.The part of image-reading device 200 is with identical according to the structure of Figure 14 explanation, and various piece adopts identical symbol with Figure 14.And the image forming apparatus of the present embodiment identical with above-mentioned image-reading device disposes the lighting unit of being put down in writing among first embodiment in the above-mentioned lighting unit.
Be sent to image processing section 1200 from the picture signal of line sensor (camera head) 6 outputs of 3 lines of image-reading device 200; In image processing section 1200, be processed, be transformed to " signal that is used to write (being used to write the signal of Huang, magenta, bluish-green, black each color) ".
Image forming portion has the photoreceptor 1100 as the photoconduction that forms cylindrical shape of " sub-image supporting body ", around it, is arranged with charging roller 1110, revolving developing apparatus 1130, transcription band 1140, the cleaning equipment 1150 as charging device.As charging device, also can replace charging roller 1110 and use " corona charging ".
When carries out image forms, the photoreceptor 1100 clockwise constant speed rotations of photoconduction, its surface is by the charging of charging roller 1110 homogeneous, and acceptance writes the exposure of carrying out by the light of the laser beam of optical scanning device 1170, forms electrostatic latent image.Formed electrostatic latent image is so-called " negative sub-image ", and image section is made public.
" writing of image " is according to the rotation of photoreceptor 1100; Order with yellow image, pinkish red image, bluish-green image, picture black is carried out; Each developing cell Y (carry out the development of yellow toner) of formed electrostatic latent image through revolving developing apparatus 1130, M (carrying out the development of pinkish red toner), C (carrying out the development of bluish-green toner), K (carrying out the development of black toner) and by discharged-area development successively; As positive image and by visual; The toner image of resulting each color applies roller 114A transcription successively by transcription voltage on transcription band 1140, the toner image of above-mentioned each color overlaps on transcription band 1140, forms coloured image.
Holding the box 1180 of autogtaphic printing paper S can install and dismounting with respect to the image forming apparatus body; Under the state of installation shown in the figure; One of the top of the autogtaphic printing paper S that is held by 1220 feedings of paper feed roller, and the fore-end of the autogtaphic printing paper S of institute's feeding is caught 1190 by alignment rolls.
Alignment rolls is sent into the transcription part to autogtaphic printing paper S to 1190 timings of moving to the transcription position according to " coloured image of toner " on the transcription band 1140.The autogtaphic printing paper S that is sent into coincides with coloured image in the transcription part, utilizes the effect of transcription roller 114B, by the electrostatic transfer coloured image.Transcription roller 114B makes coloured image press to autogtaphic printing paper S when transcription.
Transmitted to fixation facility 1160 by the autogtaphic printing paper S of transcription coloured image, in fixation facility 1160 by the photographic fixing coloured image, by unshowned guide means guide through transport path, by unshowned exit roller to being discharged on the pallet 1210.
And when the toner image of each color was by transcription at every turn, the surface of photoreceptor 1100 was by cleaning equipment 1150 cleanings, and residual toner and paper powder or the like are removed.
And the structure of image forming portion can be changed into the well-known structure that mono-color image forms that is used for.
According to the lighting unit of first to the 3rd above-mentioned embodiment and image-reading device and the image forming apparatus that uses this lighting unit; Even reading under the situation of floating part of original copy; Also can suppress the light harvesting of light source well, obtain good reading images.
It will be appreciated by those skilled in the art that according to above-mentioned instruction, can carry out multiple other modification and change.Therefore it should be understood that within the scope of the appended claims, can implement the disclosure of patent specification with the mode outside the specifically described mode here.
And in the scope of this specification and accompanying claims, the element of different exemplary embodiments and/or characteristic can make up and/or mutual alternative each other.
And, can implement with the form of equipment, method, system, computer program or computer program for any one of above-mentioned and other example feature of the present invention.For example, said method can be implemented with the form of system or device, and said system or device include but not limited to be used for carrying out any structure of method shown in the accompanying drawing.
Exemplary embodiment is so described, and it is obvious that, and it can be changed to multiple mode.Such variation should not be considered to depart from the spirit and scope of the present invention, it should be apparent to those skilled in the art that all such changing one's intention are included in the scope of accompanying claims.
Claims (8)
1. lighting unit that is used for image-reading device is arranged with a plurality ofly to the light source of illuminated part from the small area irradiates light, and said a plurality of light sources are LED; And
Wherein, in the imaginary plane that comprises said a plurality of light source and said illuminated part, said a plurality of light sources are configured in respect to outside the vertical line zone on the vertical line direction of said illuminated part; And
Said imaginary plane has two zones by said vertical line area dividing, and said light source is configured in each zone in said two zones.
2. a lighting unit that is used for image-reading device is arranged with a plurality of LED as light source, and the light that shines from said LED shines illuminated part by mirroring, and
Wherein, The configuration of changing said LED and mirror comes to said illuminated part irradiates light; In the imaginary plane that comprises said a plurality of light source and said illuminated part, the virtual image that makes the said LED that is caused through reflection is outside with respect to the vertical line zone on the vertical line direction of said illuminated part; And
Said imaginary plane has two zones by said vertical line area dividing, and said light source is configured in each zone in said two zones.
3. according to claim 1 or 2 described lighting units,
Wherein, said light source disposes similar number respectively in said two zones.
4. according to the described lighting unit of claim 2, wherein,
Said vertical line zone is equipped with said mirror or optical conductor,
The reflecting surface that mirror that disposes in the said vertical line zone or optical conductor have is a minute surface.
5. according to the described lighting unit of claim 1,
Wherein, so that LED is as excitaton source arbitrarily, the White LED of fluorescent look is sent out in use.
6. according to the described lighting unit of claim 1,
Wherein, arrange the LED of a plurality of colors respectively, constitute white illumination.
7. image-reading device comprises:
Document board disposes original copy;
Lighting unit is to the original copy irradiates light;
The components of photo-electric conversion read the image of original copy;
Image-forming component forms images to the reverberation from original copy at these components of photo-electric conversion,
Wherein, adopt any described lighting unit in claim 1 to the claim 6.
8. an image forming apparatus is equipped with the described image-reading device of claim 7.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-154292 | 2007-06-11 | ||
| JP2007154292 | 2007-06-11 | ||
| JP2007154292A JP2008304860A (en) | 2007-06-11 | 2007-06-11 | Illumination light source unit, and image reader and image forming apparatus using illumination light source unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101325640A CN101325640A (en) | 2008-12-17 |
| CN101325640B true CN101325640B (en) | 2012-01-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101249139A Expired - Fee Related CN101325640B (en) | 2007-06-11 | 2008-06-11 | Illumination unit, image reading apparatus and forming apparatus using the illumination unit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2008304860A (en) |
| CN (1) | CN101325640B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010197793A (en) * | 2009-02-26 | 2010-09-09 | Ricoh Co Ltd | Document illumination device and image reading apparatus |
| CN102077567B (en) * | 2009-02-27 | 2014-06-25 | 松下电器产业株式会社 | Reading device |
| JP2010210672A (en) * | 2009-03-06 | 2010-09-24 | Ricoh Co Ltd | Original illumination device and image reader |
| JP5836740B2 (en) * | 2011-09-29 | 2015-12-24 | キヤノン株式会社 | Light guide, illumination device, and image reading device |
-
2007
- 2007-06-11 JP JP2007154292A patent/JP2008304860A/en active Pending
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2008
- 2008-06-11 CN CN2008101249139A patent/CN101325640B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101325640A (en) | 2008-12-17 |
| JP2008304860A (en) | 2008-12-18 |
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