CN101489017B - Image reading apparatus - Google Patents
Image reading apparatus Download PDFInfo
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- CN101489017B CN101489017B CN2009100013496A CN200910001349A CN101489017B CN 101489017 B CN101489017 B CN 101489017B CN 2009100013496 A CN2009100013496 A CN 2009100013496A CN 200910001349 A CN200910001349 A CN 200910001349A CN 101489017 B CN101489017 B CN 101489017B
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Abstract
The present invention provides a image reading device which can reading image properly when employing interval black spot correction method. Reflection element and rotating the reflection element are disposed inside a zoom out optical system for irradiating the reflection light to the reading position, and guiding the reflection light of reflection part to the reflection part rocking mechanism in joint sealing detector direction. Meanwhile, inside the joint sealing detector arranged with a joint sealing detector rocking mechanism for moving the reflection light of reflection part to light reception part, and detecting device for detecting the reflection light from reflection part via the joint sealing detector rocking mechanism and the joint sealing detector when guiding the reflection light of reflection part to the joint sealing detector direction during reading intervals of reading multi-page manuscript, and a reference data connection device, which correcting the reference data used in the black spot correction according to the detected reception light reference.
Description
Technical field
The present invention relates to a kind of image-reading device, it will read when the original copy conveyance removes sub scanning direction, reading the position will dwindle surface that optical system constitutes and read the illumination light of optical system and shine in the surface of reading original copy on the surface of regulation, and this reverberation is introduced in row image detector reading optical system by described surface, with behavior unit read the described surface image that reads original copy, meanwhile, read the position than described surface and more read the detector that connects airtight in the position by being provided in by the back side in conveyance direction downstream, read the image at the described back side of reading original copy with the unit of going after, read the benchmark whiteboard images that optical system will be arranged in the assigned position by described surface and import in the described capable image detector, thereby generate the reference data that shading correction is used.
Background technology
Usually, carry out the image-reading device that paper feed (sheet through) reads, be to read original copy in the sub scanning direction conveyance, throw light on to the reading face that reads original copy in the position of reading in regulation, and its reverberation imported in the capable image detector of CCD by dwindling optical system, come the surface image that reads original copy to be read with behavior unit ground.
Also have, handle, the read level of 1 row has been carried out normalized shading correction for light quantity distribution to the lamp that uses as illumination.In addition, when carrying out shading correction, be provided with the benchmark blank that is used to form the reference white image, before reading original image, read the image of this benchmark blank earlier, make the reference data that shading correction is used.
Usually, the reference data that this shading correction is used when each original copy reads, all will be carried out before the reading of original image.Therefore, when reading many original copys, will in the processing that makes the reference data that is used for shading correction, take time, thereby limit productive raising.
In order to address this problem, what taked is in the past, it or not the action of all reading the benchmark blank that is used to make the reference data that shading correction uses at every original copy, but after every several original copys, carry out once, perhaps only after per a few minutes, carry out once, in addition original copy (hereinafter referred to as " when non-shading correction original copy reads "), carry out shading correction by the reference data that the last time is obtained, thereby omit the action of reading of benchmark blank, shorten thus and read operate time.Here, the method with this shading correction is called " intermittently shading correction method ".
Patent documentation 1: the spy opens the 2002-300394 communique
Summary of the invention
Yet, when reading many original copys continuously, the heating that causes owing to lighting continuously of lamp can reduce the light quantity of short-term, thereby cause the decline of original copy read level, when using identical shading correction reference data to carry out shading correction, just may cause taking place in the output image between initial original copy and the last original copy problem of concentration difference.
The present invention In view of the foregoing, purpose is to provide a kind of image-reading device, even when adopting intermittently the shading correction method, also can carry out suitable image and read.
Technical scheme 1 of the present invention provides a kind of image-reading device, it will read original copy in the sub scanning direction conveyance, reading the position will come from the surface that dwindles optical system and read the illumination light of optical system and shine in the surface of reading original copy on the surface of regulation, and after its reverberation read optical system and imports in the capable image detector by described surface, reading the described image that reads the original copy surface with behavior unit when, read the position than described surface and more read the detector that connects airtight in the position by being provided in by the back side in the conveyance direction downstream, the described image that reads the back side of original copy is read as capable unit, to be arranged on benchmark whiteboard images in the assigned position then reads optical system by described surface and imports in the described capable image detector, thereby generate the reference data that shading correction is used, it is characterized in that: dwindle in the optical system described, be provided with and shine the reflection part that reads in the position after the described illumination light reflection, with the described reflection part of rotation, with the described reflection part head motion that connects airtight detector direction of the guides reflected light of described reflection part, meanwhile, connect airtight in the detector described, being provided with reverberation with described reflection part turns to and can be subjected to connect airtight the detector head motion in the light mode, also be provided with checkout gear, it reads reading in the interval of original copy at multipage, by described reflection part head motion with the guides reflected light of described reflection part is described connect airtight detector direction in, by the described detector head motion that connects airtight, connect airtight the reverberation that detector is accepted described reflection part by described, and detect this and be subjected to the light level, also be provided with the reference data means for correcting, it carries out level according to the described detected reference data that is subjected to the light level to come described shading correction is used and proofreaies and correct.
Technical scheme 2 of the present invention is characterized in that according to technical scheme 1 described image-reading device: described gain of connecting airtight data can be read overleaf, and switches between detecting by the light level that is subjected to of described checkout gear.
Therefore, according to the present invention, along with the change of light amount, the reference data that shading correction is used obtains proofreading and correct, because this regular suitable correction, just can guarantee the quality of institute's reading images.
Description of drawings
With reference to following to accompanying drawing detailed explanation can understand complete description to public technology and feature thereof faster and betterly.Wherein,
Fig. 1 is the summary pie graph of the image-reading device 1 that relates to of embodiments of the invention.
Fig. 2 is the synoptic diagram that is used to illustrate the common mode that reads and light quantity detection mode.
Fig. 3 is that the signal processing system of the image-reading device 1 that relates to of present embodiment is wanted the module diagram of portion.
Shown in Figure 4 is to connect airtight the module diagram that detector constitutes.
Shown in Figure 5 is the flow chart on opportunity that is used to illustrate when paper feed multipage single face reads action.
Shown in Figure 6 is a schematic flow sheet of action.
Shown in Figure 7 is the illustration figure of stain reference data correcting mode.
Shown in Figure 8 is the synoptic diagram that concerns between benchmark blank reading of data and the yield value.
Embodiment
Below with reference to illustrating embodiments of the present invention.
Shown in Figure 1 is that the summary of the related image-reading device of one embodiment of the present of invention 1 constitutes this image-reading device 1 and comprises and separate the back conveyance page by page to read auto document conveyance assembly 1a that position RL goes and the image reading assembly 1b that original image 1 row 1 that reads the position is read capablely with reading original copy from document board 2.Here, image reading assembly 1b comprises 2 kinds of read functions of the original copy read functions of the two sides original copy read functions of page paper sweep type (paper feed reads) and books sweep type.In addition, the present invention in the following description, omits the explanation to the original copy read functions of books sweep type because relate generally to the original copy read functions of page paper sweep type.
In auto document conveyance assembly 1a, mounting reads among the original copy PP in 2 li of document boards, be positioned at go up most and original copy by choose get roller 3 and be removed after, deliver to 4 li of separation assemblies, deliver to after being separated page by page by this separation assembly 4 then and send 5 li on roller.This is sent roller 5 and reads original copy by guiding parts GG with 1 page and pass out in the conveyance direction.
Thus, read original copy PP and be clamped to 7 li of carrying roller 6 and conveyance drums, and to connect airtight state in the surface of conveyance drum 7 by conveyance, be maintained in the carrying roller RR1 in the front of reading position RL, be maintained in the carrying roller RR2 by reading position RL, then, arrived 8 li of distributing rollers by conveyance, arrived 9 li of row's paper discs by row's paper through distributing roller 8 backs by the conveyance guiding.
Here, be provided with in the front of distributing roller 8 be used to read this back side image that reads original copy PP connect airtight detector C S.
In addition, in master copy reading assembly 1b, also set and be used to carry out page contact glass 10 of paper scanning corresponding to reading position RL.
In addition, in the right side of contact glass 10, set the contact glass 11 that is used for books scanning.Here, benchmark blank WL is used to constitute the reference white image that shading correction is used.
Then, from reading the reverberation that position RL comes, through behind the 1st reflective mirror the 14, the 2nd reflective mirror 16 and the 3rd reflective mirror 17 etc. reflective, be directed to 19 li on lens successively, after the focusing of scioptics 19, be irradiated to 21 li of the capable image detectors of the CCD that is arranged on 20 li of substrates.
In addition, lamp 12, reflection part 13 and the 1st reflective mirror 14 are equipped on the 1st moving body 15, do on sub scanning direction SS in round the moving, and the 2nd reflective mirror 16 and the 3rd reflective mirror 17 are equipped on the 2nd moving body 18, do to come and go on sub scanning direction SS and move.In addition, in order to keep from the optical path length contact glass 10 to the CCD capable image detectors 21, the translational speed of the 2nd moving body 18 is 1/2 of the 1st moving bodys 15.
Also have, scanning motor 22 is in order to drive the 1st moving body 15 and the 2nd moving body 18.
In addition, 13 li of the reflection parts of present embodiment, can be partial to for the reverberation that makes lamp 12 and to connect airtight detector C S, and be provided with reflection part head motion (not shown), so that reflection part 13 can be shifted one's position between the common mode that reads and the 2 kinds of states such as light quantity detection mode when connecting airtight detector C S and detect the light quantity of lamp 12.
In addition, connect airtight detector C S in order to accept to come from the reverberation of reflection part 13, connect airtight detector head motion (not shown) and be provided with, connecting airtight detector C S can be in the common mode that reads and detect after in order to the reverberation of accepting lamp 12 between 2 kinds of states such as light quantity detection mode of its light quantity and shift one's position.
Also have, as shown in Figure 2, when reflection part 13 with when connecting airtight detector C S and being positioned at the state of light quantity detection mode, conveyance guiding parts LL and carrying roller RR2 on being positioned at from reflection part 13 to the light path of connecting airtight detector C S, by not shown conveyance member head motion, be moved to hiding out above-mentioned light path.Corresponding to above-mentioned reflection part 13 and the example that connects airtight detector C S, be called " the common mode that reads " in this position that will be positioned on the light path, the state of avoiding on light path is called " light quantity detection mode ".Also have, during this state, in the casting die part 10a of fixing contact glass 10, be provided with slit (not shown) so that come from reflection part 13 light beam can by after remove to connect airtight detector C S.
Shown in Figure 3 is that the signal processing system of the image-reading device 1 that relates to of present embodiment is wanted the illustration of portion.In addition because the present invention pay close attention to be the single face read mode time action, so the diagram and the explanation of the action when this has omitted about the two sides read mode.
In the figure, CCD drive division 31 is in order to the action of reading of driven CCD row image detector 21, read signal in simulation process portion 32 from the simulation of capable image detector 21 outputs of CCD, after the simulation process through regulation, be transformed corresponding to the digital of specified bit number by analog-to-digital converter 33 and read in the signal, after quilt in the sub scanning direction is average, join 36 li of shading correction portion 35 and stain reference data calculating parts by the equalization loop.
Stain reference data calculating part 36 is in order to make the reference data that shading correction is used, and the reference data of initial 1 row that extracts is saved in 37 li of memories.Also have, the reference data that shading correction portion 35 will be used for the shading correction processing is saved in 38 li of reference data memories.
The shading correction that shading correction portion 35 uses the reference data that is kept at 38 li of reference data memories to stipulate is handled, its output is after image processing part 39 back warps are crossed the Digital Image Processing (for example Gamma correction or mtf correction etc.) of regulation, and being situated between is output in the external equipment by view data efferent 40.
Image read control part 41 respectively to CCD drive division 31, simulation process portion 32, analog-to-digital converter 33, equalization loop 34, connect airtight detector head motion 42, conveyance member head motion 43, reflection part head motion 44, drive lamp 12 lamp drive division 12d, drive the action of connecting airtight detector drive division CSd of connecting airtight detector C S and control in, the gain signal SG that gain is read in setting outputs to and connects airtight in the detector C S.
In addition, operation display part 45 comprises that the user is used for operating the operating means of operation keys of this image-reading device 1 etc., and the display unit that is used for showing to the user LCD etc. of various information, and it reads at image under the control of control part 41 and moves.In addition, after the action of scanning motor 22 is read control part 41 and is controlled by image, the 1st moving body 15 and the 2nd moving body 18 mobile controlled (the omitting diagram) on sub scanning direction.
Shown in Figure 4 is a configuration example of connecting airtight detector C S.
In the figure, detector portion 51 comprises the capable image detector of CCD (not shown) and light-emitting diode row (omitting diagram), and LED control part 52 is used for the lighting a lamp of light-emitting diode row of control detector portion 51.
Read signal by the simulation that the capable image detector of CCD of detector portion 51 is exported, when 53 li in clamper (clamp) circuit is by clamper, be imported into sampling/maintenance after 54 li of sampling/holding circuits, its output is by after variable gain amplifier 55 amplification, the numeral that is transformed into corresponding specified bit number at analog-to-digital converter 56 places reads signal, is output in the next stage circuit again.
In addition, clamp circuit 53, sampling/holding circuit 54, variable gain amplifier 55 and analog-to-digital converter 56 are loaded into 1 signal processing circuit 57 (for example being made of customization LSI equipment or ASIC equipment) lining.
Also have, the gain of variable gain amplifier 55 is by coming from image and reading the gain signal SG of control part 41 and controlled.
Shown in Figure 5 is that many page or leaf paper carries out the opportunity flow chart of single face when reading during to paper feed, and shown in Figure 6 is an example of this action.
Here, angle control signal is that image reads the signal that control part 41 outputs to 44 li of conveyance member head motion 43 and reflection part head motions, when being in "Yes" (assert) state (high level H among the figure), by conveyance member head motion 43 and reflection part head motion 44, conveyance guiding parts LL and carrying roller RR2 and reflection part 13 are in the light quantity detection mode respectively, when being in " non-" (negate) during state (low water-mark L among the figure), by conveyance member head motion 43 and reflection part head motion 44, conveyance guiding parts LL and carrying roller RR2 and reflection part 13 are in the common mode that reads respectively.
In addition, for connecting airtight detector head motion 42, when standby, when reading, paper feed multipage single face often is set in the light quantity detection mode, so that the illumination light of lamp can be injected at any time with connecting airtight detector C S.
Here, in paper feed multipage single face reads, when beginning action at first connected airtight the action of reading of detector C S, and (image detector original copy field subscan useful signal is in "Yes" (assert) state, with reference to Fig. 5 (d)), light quantity to lamp 12 is monitored, and the output valve L1 (x) that connects airtight detector C S is saved to memory 37 (step 101) lining by shading correction reference data calculating part 36.It becomes the initial stage light quantity (fiducial value) of the lamp 12 of this action.
Afterwards, the 1st moving body 15 moves to the below (step 102) of benchmark blank WL, obtains the anti-measured value data of primary reference white D (x) (step 103: blank field subscan useful signal (Fig. 5 (b) is in the "Yes" state)).
Between this step 102 and step 103, by conveyance member head motion 43 and reflection part head motion 44, reflection part 13 and conveyance guiding parts LL and carrying roller RR2 are in the common mode that reads (angle control signal is " non-" state) respectively.
This moment, the obtained firm and hard measured value data of reference white were saved to 37 li of memories by stain reference data calculating part 36.
Next, moving body moves to lining, position (step 104) originally, and carry out the capable image detector 21 of CCD read action (step 105).At this moment, stain reference data calculating part 36 will be saved in 37 li of memories the data former state be saved in 38 li of reference data memories, thus, for first page of master copy data, shading correction is not carried out any correction calculation to obtained benchmark blank data, only is same as shading correction (step 106) in the past.
After first page of original copy reads end, going to read between second page of paper and paper till the master copy data (result of step 107 for can not), once more angle control signal is arranged at the "Yes" state, simultaneously, by conveyance member head motion 43 and reflection part head motion 44, make conveyance guiding parts LL and carrying roller RR2, and reflection part 13 is in the light quantity detection mode respectively.
Meanwhile, with when beginning action similarly, between paper and paper, also make and connect airtight detector C S original copy field subscan useful signal and be in the "Yes" state, and the light quantity of lamp 12 is monitored by connecting airtight detector C S, thus, output valve L2 (x) is imported into 36 li of stain reference data calculating parts after connect airtight detector C S output (step 108).
Here, shading correction reference data calculating part 36 is tried to achieve the ratio of the L1 (x) that is kept at 37 li of memories, this correction coefficient is added to benchmark blank data D (x) lining that is kept at 37 li of memories equally.Benchmark blank data D2 (x) after this correction are saved to 38 li of reference data memories (step 110), and thus, shading correction portion 35 carries out shading correction according to the benchmark blank data D2 (x) after proofreading and correct and handles.
Afterwards, the 3rd page of later master copy data reads and also carries out same processing.
Also have, the correction calculation of step 110 is carried out at the each point of main scanning as shown in Figure 7.As mentioned above, shown in the following chamber of correction calculation of the benchmark blank data at the x place, main scanning position of n page or leaf.
Wherein,
X: main scanning location of pixels (being x=0 during left end),
D (x): the firm and hard survey data of reference white among when beginning action obtained main scanning position x,
L
1(x): the output valve of connecting airtight the type image detector among the main scanning position x of the 1st page (during the action beginning),
L
N(x): the output valve of connecting airtight the type image detector among the main scanning position x of N page or leaf,
D
N(x): the firm and hard survey data of reference white among the main scanning position x of N page or leaf.
In addition, for the output valve of the light quantity of the lamp 12 of being monitored, before entering step 110, image reads the judgement (step 109) that control part 41 carries out output valve.When output valve when threshold value is following, the light quantity of just looking lamp 12 is for very low, or the lamp that disappears suddenly etc. is unusual, being situated between then is notified to user or service center's (step 111) by operation display part 45.Also have, consider the machine kind, etc. 12 light quantity, the threshold value of abnormality juding can be set arbitrarily by the register (not shown) that is set in image and reads 41 li of control parts.
All original copys read and finish back (result of step 107 for can), once more angle control signal are set in the "Yes" state, and in the same manner, with conveyance guiding parts LL and carrying roller RR2, and reflection part 13 is set in the light quantity detection mode during with beginning.In addition, the action when connecting airtight detector C S and only reading on the two sides is set at the common mode that reads when beginning and finishing, thereby can read the original copy back side.
Yet, in connecting airtight detector C S, be to regulate the gain that usefulness is read at the back side by variable gain amplifier 55.Here, because be arranged between the light quantity of light source with light emitting diode matrix and lamp 12 of 51 li in the detector portion of connecting airtight detector C S variant, if will connect airtight the original copy back side in the detector C S reads the yield value former state of using and uses unchangeably in the light quantity monitor of lamp 12, just might produce the light quantity precision and degenerate, the output valve that also can cause connecting airtight detector C S sometimes is saturated.
To this, because the light quantity that roughly can distinguish lamp 12 by the value of monitoring criteria blank, so just utilize this method.That is stain reference data calculating part 36 notifies image to read 41 li of control parts the maximum of stain reference data.Thus, according to this maximum, image reads control part 41 and outputs to the value of the gain signal SG that connects airtight in the detector C S by adjusting, when the light quantity of lamp 12 is monitored, makes the output valve of connecting airtight detector C S can be unsaturated.
In addition, because life-span of lamp 12 relation and can produce the light quantity change for this is followed the tracks of, recovers in power initiation, power saving, and the benchmark blank data of pressing plate when reading are all carried out above-mentioned gain adjustment of connecting airtight detector C S when obtaining each time.
Be specifically, make the value of benchmark blank data as shown in Figure 8, and the map table between corresponding with it aforementioned yield value that connects airtight detector C S (the light quantity monitoring of lamp 12 with), and this map table is used for image reads control part 41.
Afterwards, when reading the benchmark blank opportunity of reading with power initiation, power saving recovery, pressing plate, the maximum of the measured data that 1 after half homogenizing is capable transforms in the yield value that connects airtight in the detector C S by the aforementioned map table that is saved.
Afterwards, when paper feed multipage single face reads, this yield value is reflected to 55 li of the variable gain amplifiers that connect airtight in the detector C S.Then, read on the beginning two sides, carries out the yield value switching of detector inside and the lamp of lighting a lamp, disappear of light emitting diode matrix when finishing.
Thus, when operation display part 45 is assigned the order of reading on paper feed multipage two sides, connect airtight the angle that the angle of detector C S reads for the original copy back side, the yield value of the variable gain amplifier 55 in the detector also reads the value of usefulness as the original copy back side, carry out the also control of machine in the past that is equal to for often lighting a lamp of light emitting diode matrix in the detector.
As mentioned above, when the paper feed multipage single face original copy of present embodiment read, the shading correction action was only being carried out 1 time at first, in the shading correction action of omitting between paper and the paper, and the view data that can obtain to stabilize, thus boost productivity.
Though the foregoing description is the explanation that the situation that black and white reads is done, the present invention is suitable for too for the situation that colour reads.At this moment, because the light quantity change of each RGB is all different during colored reading, by each RGB being carried out above-mentioned correction calculation and adjusts gain, decline that also can the correction of color reproducibility.Certainly, during this situation, the amount that the benchmark blank data that the data accumulating device is remembered, yield value need be prepared 3 passages such as RGB.And when reading black and white image, only use the G passage in the RGB3 passage to carry out above-mentioned correction calculation, abnormality juding by the coloured image fetch equipment.
The basis of present patent application and priority request be on 01 07th, 2008, at the Japanese patent application JP2008-000341 of Japan Patent office application, its full content draws the do combination at this.
From the above many improvement and variation can also be arranged.That is within the scope of the claims, the disclosure of this patent specification is not limited to above-mentioned explanation.
Claims (3)
1. image-reading device, it will read original copy in the sub scanning direction conveyance, reading the position will come from the surface that dwindles optical system and read the illumination light of optical system and shine in the surface of reading original copy on the surface of regulation, and after its reverberation read optical system and imports in the capable image detector by described surface, reading the described image that reads the original copy surface with behavior unit when, read the position than described surface and more read the detector that connects airtight in the position by being provided in by the back side in the conveyance direction downstream, the described image that reads the back side of original copy is read as capable unit, to be arranged on benchmark whiteboard images in the assigned position then reads optical system by described surface and imports in the described capable image detector, thereby generate the reference data that shading correction is used, it is characterized in that:
Dwindle in the optical system described, be provided with and shine the reflection part that reads in the position after the described illumination light reflection, with the described reflection part of rotation, with the described reflection part head motion that connects airtight detector direction of the guides reflected light of described reflection part, meanwhile, connect airtight in the detector described, be provided with reverberation with described reflection part and turn to and to be subjected to connect airtight the detector head motion in the light mode
Also be provided with checkout gear, it reads reading in the interval of original copy at multipage, by described reflection part head motion with the guides reflected light of described reflection part is described connect airtight detector direction in, by the described detector head motion that connects airtight, connect airtight the reverberation that detector is accepted described reflection part by described, and detect this and be subjected to the light level
Also be provided with the reference data means for correcting, it carries out level according to the described detected reference data that is subjected to the light level to come described shading correction is used and proofreaies and correct.
2. image-reading device according to claim 1 is characterized in that:
Described gain of connecting airtight data can be read overleaf, and switches between detecting by the light level that is subjected to of described checkout gear.
3. image-reading device according to claim 1 and 2 is characterized in that:
Described checkout gear when described detected be subjected to the light level less than the regulation threshold value the time, take place with regard to output error.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP000341/08 | 2008-01-07 | ||
| JP2008000341A JP2009164869A (en) | 2008-01-07 | 2008-01-07 | Image reading device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101489017A CN101489017A (en) | 2009-07-22 |
| CN101489017B true CN101489017B (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100013496A Expired - Fee Related CN101489017B (en) | 2008-01-07 | 2009-01-07 | Image reading apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2009164869A (en) |
| CN (1) | CN101489017B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4920088B2 (en) * | 2010-01-05 | 2012-04-18 | シャープ株式会社 | Illumination apparatus, image reading apparatus including the illumination apparatus, and image forming apparatus including the image reading apparatus |
| JP7335550B2 (en) | 2019-11-29 | 2023-08-30 | 株式会社リコー | Image reading device, image forming device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191442A (en) * | 1997-02-07 | 1998-08-26 | 株式会社理光 | Image read unit |
| CN1206284A (en) * | 1997-06-30 | 1999-01-27 | 株式会社理光 | Picture pick-up unit |
| CN1495555A (en) * | 2002-08-28 | 2004-05-12 | 佳能株式会社 | Black point correcting method for sensor, and colour image forming deivce |
| CN1619430A (en) * | 2003-11-20 | 2005-05-25 | 株式会社理光 | Document size detecting method, document reading apparatus and imaging apparatus |
-
2008
- 2008-01-07 JP JP2008000341A patent/JP2009164869A/en active Pending
-
2009
- 2009-01-07 CN CN2009100013496A patent/CN101489017B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1191442A (en) * | 1997-02-07 | 1998-08-26 | 株式会社理光 | Image read unit |
| CN1206284A (en) * | 1997-06-30 | 1999-01-27 | 株式会社理光 | Picture pick-up unit |
| CN1495555A (en) * | 2002-08-28 | 2004-05-12 | 佳能株式会社 | Black point correcting method for sensor, and colour image forming deivce |
| CN1619430A (en) * | 2003-11-20 | 2005-05-25 | 株式会社理光 | Document size detecting method, document reading apparatus and imaging apparatus |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2003-110854A 2003.04.11 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009164869A (en) | 2009-07-23 |
| CN101489017A (en) | 2009-07-22 |
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