CN1726695A - Image sensor unit and image reacter - Google Patents
Image sensor unit and image reacter Download PDFInfo
- Publication number
- CN1726695A CN1726695A CN200380100617.0A CN200380100617A CN1726695A CN 1726695 A CN1726695 A CN 1726695A CN 200380100617 A CN200380100617 A CN 200380100617A CN 1726695 A CN1726695 A CN 1726695A
- Authority
- CN
- China
- Prior art keywords
- mentioned
- optical axis
- original copy
- imaging device
- lighting device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
- H04N1/1013—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components
- H04N1/1017—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces with sub-scanning by translatory movement of at least a part of the main-scanning components the main-scanning components remaining positionally invariant with respect to one another in the sub-scanning direction
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/02845—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array
- H04N1/02855—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array in combination with a light guide, e.g. optical fibre, glass plate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/024—Details of scanning heads ; Means for illuminating the original
- H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
- H04N1/02815—Means for illuminating the original, not specific to a particular type of pick-up head
- H04N1/02845—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array
- H04N1/0286—Means for illuminating the original, not specific to a particular type of pick-up head using an elongated light source, e.g. tubular lamp, LED array in combination with a light integrating, concentrating or defusing cavity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/19—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays
- H04N1/191—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using multi-element arrays the array comprising a one-dimensional array, or a combination of one-dimensional arrays, or a substantially one-dimensional array, e.g. an array of staggered elements
- H04N1/192—Simultaneously or substantially simultaneously scanning picture elements on one main scanning line
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Scanning Arrangements (AREA)
- Facsimile Heads (AREA)
- Image Input (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
Abstract
Illuminators are disposed oppositely on the opposite sides of a lens array. Assuming the effective depth of field of the lens array is a, 90% power band width of the quantity of light distribution curve of the illuminators along the optical axis of the lens array is not smaller than a for both illuminators. Intersection of the optical axis of illumination light from the illuminator and the optical axis of the lens array is located closer to the lens array than a document side focal point and the intersection of the optical axis of exiting light from the illuminator and the optical axis is located farther from the lens array than the document side focal point. Distances between the intersections and the document side focal point are respectively not longer than a/2.
Description
Technical field
The present invention relates to be suitable for the image sensor cell and the image read-out of image analyzer, facsimile machine and photocopier etc., particularly read catoptrical image sensor cell and image read-out from the original copy face.
Background technology
In the past, in the image read-out of image analyzer, facsimile machine and photocopier etc., used and be adjacent to type imageing sensor (below, abbreviate CIS as) as reading one of catoptrical image read-out from the original copy face.
This is adjacent to the type imageing sensor and has the light source that is used to shine original copy, receives the reverberation of scioptics, at the light receiving unit that forms with the components of photo-electric conversion reverberation is transformed to electrical image.In recent years, along with the high speed of the reading speed of image read-out,, require to increase illumination light intensity in order to shorten time for reading.Thereby, disclose clip lens arra make the lighting device of 2 systems increase relatively the irradiation light quantity technology (for example, patent documentation 1 (spy opens the 2002-57853 communique)).
Be adjacent to type image sensor cell (CIS unit) and be installed in the transparent upward use of original copy supporter below of supporting original copy.Mainly contain following 2 kinds in the mounting means of the image sensor cell in image read-out.
(1) fixation of sensor unit on image read-out makes the original copy on the original copy supporter move the paper feeding type that reads
(2) make on the body fixedly original copy at the original copy of image read-out, what sensor unit is moved read is plate
At this, the formation example of CIS unit in the past is described.Fig. 8 is a sectional drawing of representing that CIS unit in the past constitutes.In CIS unit in the past, light source 15a and the 15b of the LED that loads the original copy that is used to throw light on and lighting device 16a and 16b in framework 11 upper supports.Lighting device 16a and 16b are by the ejaculation light that is taken into respectively from light source 15a and 15b, and the light conductor that on 1 length of going of original reading unit the illumination light quantity is roughly penetrated equably constitutes.In addition, below framework 11, be mounted with the sensor base plate 14 of the sensor array 13 of wire, it is the light receiving unit of the signal of telecommunication that the sensor array 13 of this wire possesses a plurality of optical image opto-electronic conversion original copy, the optical image of original copy is imaged on lens arra 12 on the sensor array 13 also being supported with on the framework 11.In addition, the terminal 17 that connects sensor array 13 and external mechanical is installed below sensor base plate 14.CIS unit in the past like this is installed on the below of original copy supporter 18 and uses as mentioned above.
In this CIS unit, in order to increase the light quantity of lighting device of illumination original copy, 2 illuminators being made up of light source and lighting device are set, it is relative on the position of symmetry that these 2 illuminators are configured to clip lens arra 12.In addition, on the light injection unit of lighting device 16a and 16b, light-focusing function is set, to improve the utilization ratio of light.
For example, the original copy side focus A of lens arra 12 is floated a little than the original copy side surface position of original copy supporter 18.On the position of leaving lens arra 12, make light optically focused from the lighting device of 2 systems.That is, the depth of field of lens arra 12 increases.By being arranged to such structure, in the image read-out of paper feeding type, can avoid following the original copy of chart drive speed high speed and the excessive phenomenon of contact friction between the original copy supporter, in addition, in the plate type image reading device, can read irregular from the teeth outwards original copy easily.
In patent documentation 1, proposed by the peak from the illumination light of light source is floated a little than original copy one side's focus of lens arra, even the formation that under the situation that the original copy paper floats from the original copy supporter, also can read with stable light quantity.
If adopt from the method for these 2 relative directions irradiation original copys, then when the light quantity of illumination original copy increases, can reduce with original copy on the generation of shade of the corresponding generation of surface state such as concavo-convex, with the quality of raising reading images.
But, in such conventional art, have following problem.
In order to carry out more reading at a high speed, need further to improve light utilization ratio from light source, need increase light quantity by carrying out optically focused from the light of the light injection unit of light conductor.Thereby, in patent documentation 1, when using a plurality of lighting devices to increase the light quantity of illumination original copy, make the consistent light quantity that increases in focal position of 2 light sources.But, in this constitutes, improving the result of the optically focused of light conductor, the synthetic light quantity distribution of illumination light is sharp-pointed, produces following such side effect.
Fig. 9 is that displaying has used the high speed paper of CIS unit in the past to present the sectional drawing of the image read-out of type.With original copy supporter 18 pressing plate 27 is set relatively in this image read-out, the space between original copy supporter 18 and the pressing plate 27 becomes paper and transmits road 28.In addition, clip paper transmission road 28 original copy conveying roller 25 is set, in paper transmits road 28, transmit original copy 26 with original copy conveying roller 25.The height of pressing plate 27 is configured to the central authorities that original copy side focus A position paper transmits road 28.
Present in the type image read-out at the high speed paper that has used such CIS unit, when original copy 26 transmitted road 28 by paper, the position of the optical axis direction original copy 26 of lens arra 12 was that benchmark is gone up change in far and near two directions (optical axis direction of lens arra 12) with original copy side focus A relatively.The width P on paper transmission road 28 represents the Breadth Maximum of original copy 26 its shift in position of swing.Then, if the position of original copy 26 changes on the optical axis direction of lens arra 12, because the optical axis of the relative lens arra 12 in surface of original copy 26 is vertical, so the lip-deep illumination light quantitative changeization of original copy 26.Therefore, even the concentration of original copy 26 is even, also on the output image of reading device, produce the concentration change that depends on the variation in altitude that reads the position easily.
In addition, even in plate image read-out in the past, as mentioned above, usually, the original copy side focal position A of lens arra 12 is set at the top of original copy side surface position of original copy supporter 18 so that have concavo-convex original copy on the surface and easily be read.Therefore, concentration change takes place in the position of original copy easily under the situation of the optical axis direction change of lens arra 12.
In order to suppress such concentration change, in the field depth of lens, require the allowed band of the light quantity of illumination light change is arranged in 10%.
Thereby, on patent documentation 2 (No. 2848477 communique of patent), put down in writing the light source that disposes 2 systems, on the optical axis of photo detector, be offset, made that the illumination of original copy face is roughly certain in the field depth of imaging device at above-below direction by the irradiation position that makes each light source.In such formation, synthetic light quantity distribution is flattened, even produce original copy offset, the change that also can suppress to read light quantity.
But in this constituted, though the uniformity of light quantity distribution improves, synthetic light quantity self did not increase, and not talkatively was suitable for reading at a high speed.
Like this, under the situation of having used a plurality of light sources, increasing synthetic light quantity, and the relation that makes its light quantity distribution exist compromise to select between evenly.That is, if pay attention to uniformity then the acuteness minimizing peak value light quantity minimizing of synthetic light quantity distribution.
Summary of the invention
The present invention proposes in view of the above problems, and it is a kind of when can obtaining high irradiation light quantity that its purpose is to provide, and can suppress to follow the image sensor cell and the image read-out that read the light quantity change of original copy variation in altitude.
Image sensor cell of the present invention has the 1st and the 2nd lighting device of illumination original copy; To carry out the imaging device of imaging from the reverberation of original copy; The image sensor cell that possesses the sensor array of many pixels that above-mentioned reverberation are transformed to the signal of telecommunication, it is characterized in that: it is relative mutually that the above-mentioned the 1st and the 2nd lighting device is configured in the both sides of above-mentioned imaging device, if effective depth of field of imaging device is set to a, then along 90% value width of the light quantity distribution curve of each lighting device of the optical axis of above-mentioned imaging device all more than or equal to a, from the 1st intersection point of the optical axis of the optical axis of the ejaculation light of above-mentioned the 1st lighting device and above-mentioned imaging device than the original copy side focus of above-mentioned imaging device also near on the position of above-mentioned imaging device, from the 2nd intersection point of the optical axis of the optical axis of the ejaculation light of above-mentioned the 2nd lighting device and above-mentioned imaging device than the original copy side focus of above-mentioned imaging device on the position of above-mentioned imaging device, the distance of the above-mentioned the 1st and the 2nd intersection point and above-mentioned original copy side focus is all smaller or equal to a/2.
In the present invention,, the 1st and the 2nd intersection point on different mutually directions, misplaces, so can suppress along the change of the synthetic light quantity of the optical axis of imaging device because being benchmark with original copy side focus.In addition, because stipulated the size of skew and the light quantity distribution zone of each lighting device agreeablely, so the light quantity variation in the scope of effective depth of field a of imaging device is 10% with in interior, the peak value of synthetic light quantity more than or equal to when lighting device is 1 180%.Thereby, when can obtaining high irradiation light quantity, can suppress to follow the change of reading light quantity of original copy variation in altitude.
Description of drawings
Fig. 1 is a sectional drawing of showing the CIS unit formation that relates to embodiment of the present invention 1.
Fig. 2 is the ideograph of 90% value width of showing the light quantity distribution curve of optical axis and lighting device 5.
Fig. 3 shows apart from the height dL on original copy supporter 18 surfaces and the curve chart of various relative light quantity relations.
Fig. 4 shows the curve chart with the relative light quantity relation during as benchmark the irradiation light quantity of 1 irradiation unit apart from the height dL on the surface of original copy supporter 18.
Fig. 5 is a sectional drawing of showing the CIS unit formation that relates to embodiment of the present invention 2.
Fig. 6 is a sectional drawing of showing the CIS unit formation that relates to embodiment of the present invention 3.
Fig. 7 is an outward appearance oblique view of showing the plate type image scanner that relates to embodiment of the present invention 4.
Fig. 8 is the sectional drawing that CIS unit in the past constitutes.
Fig. 9 is that displaying has used the high speed paper of CIS unit in the past to present the sectional drawing of type image read-out.
Figure 10 is the ideograph that is illustrated in the formation described in the patent documentation 2 (conventional art).
Figure 11 is the curve chart that is illustrated in resulting light quantity distribution curve in the formation shown in Figure 10.
Embodiment
Below, specifically describe embodiments of the present invention with reference to accompanying drawing.
(execution mode 1)
At first, embodiments of the present invention 1 are described.Fig. 1 is a sectional drawing of showing the CIS unit formation that relates to embodiment of the present invention 1.The lighting device 5 and 6 that the illumination original copy is arranged in framework 1 upper support in the present embodiment.The sensor base plate 4 that is mounted with sensor array 3 is installed below framework 1, it is the light receiving unit of the signal of telecommunication that this sensor array 3 possesses a plurality of optical image light-to-current inversions original copy, the optical image of original copy is imaged on lens arra (imaging device) 2 on the sensor array 3 also being supported with on the framework 1.Sensor array 3 is positioned on the sensor side focus of lens arra 2.In addition, the terminal 7 that connects sensor array 3 and external mechanical is installed below sensor base plate 4.And then, LED (not shown) is set as light source on lighting device 5 and 6.
Lighting device 5 and 6 clips lens arra 2 mutually and disposes relatively.In addition, the horizontal range x1 of the basic point 5a of the optical axis Z2 of the optical axis Z1 of lens arra 2 and lighting device 5 is also shorter than the horizontal range x2 of the basic point 6a of the optical axis Z3 of optical axis Z1 and lighting device 6.And then in the present embodiment, lighting device 5 is configured to the intersection points B of its optical axis Z2 and optical axis Z1 and compares near lens arra 2 with the original copy side focus A of lens arra 2.On the other hand, the lighting device 6 intersection point C that is configured to its optical axis Z3 and optical axis Z1 compares away from lens arra 2 with the original copy side focus A of lens arra 2.
In addition, configuration lighting device 5 and 6 makes the distance of focus A and intersection points B, and the distance of focus A and intersection point C is in fact equal mutually.And then if effective depth of field of lens arra 2 is set to a, then the distance of the distance of focus A and intersection points B and focus A and intersection point C is all smaller or equal to a/2.
And then, along 90% value width of the light quantity distribution curve of the lighting device 5 of the optical axis of lens arra 2 and 6 all more than a.At this, 90% value width of the light quantity distribution curve of optical axis and lighting device 5 is described with reference to Fig. 2.
The optical axis Z1 of so-called lens arra 2 is meant the original copy side focus A of connection lens arra 2 and the straight line of sensor side focus D.In addition, the optical axis Z2 of so-called lighting device 5 also is the optical axis from the ejaculation light of lighting device 5, as shown in Figure 2, be meant change original copy face O apart from the height of original copy supporter (not shown) when penetrating the light projection and lead original copy face O and go up, connect to the line of the peak of the catoptrical light quantity distribution curve S of original copy face O orthogonal direction.And then sensor array 3 is configured on the sensor side focus D.
In addition, 90% value width of the light quantity distribution curve of so-called lighting device 5, be meant in the distribution curve I (Z) of expression illumination light intensity distributions, this illumination light intensity becomes the width W more than or equal to the moving range of the original copy face O of peak value 90%, said here illumination light intensity distributions be the optical axis Z1 along lens arra 2 when original copy face O is moved optical axis Z1 and the illumination light intensity in the intersection point (reading a little) of original copy face O.
90% value width of the optical axis Z3 of lighting device 6 and light quantity distribution curve too.
And then basic point 5a and the 5b height on the optical axis direction of lens arra 2 is consistent with each other.
Such CIS unit is installed in the below of the original supporter 8 that supports original copy and uses.
In the CIS unit of the execution mode 1 that constitutes like this, in the time of near original copy is positioned at focus A, from the illumination light quantity of lighting device 5 and 6 mutually about equally, their summation is irradiated onto on the original copy.
If compare more with focus A from this state original copy and to move to lens arra 2 lateral deviations, then when the illumination light quantity from lighting device 5 increases, reduce from the illumination light quantity of lighting device 6, their summation is irradiated onto on the original copy.
On the other hand, if original copy is compared with focus A to the direction skew of leaving lens arra 2, then when the illumination light quantity from lighting device 5 reduced, from the illumination light quantity increase of lighting device 6, their summation was impinged upon on the original copy.
Thereby, 2 optical axis Z1 moves to a certain direction even original copy is from focus A along lens arra, be the variation in altitude of original copy, also cancel out each other that the synthetic light quantity that is radiated on the original copy does not almost change from the change of the irradiation light quantity of lighting device 5 and 6 apart from original copy supporter 8.Its result if adopt present embodiment, then can alleviate the concentration change that takes place on the output image of image read-out.
Below, illustrate that in fact the present inventor makes the paper feeding type image read-out that possesses with execution mode 1 same CIS unit of constructing, measure the result of light quantity distribution.
In this paper feeding type image read-out, effective depth of field a of lens arra 2 is set to ± 0.3mm, shift in position width P when paper transmits is set to 0.6mm, and the position of the original copy side focus A of lens arra 2 is set to leave 0.3mm from the former surface that this makes body 18.
In this case, the shift in position of the original copy on the optical axis direction of lens arra 2 is the maximum generation ± 0.3mm of benchmark with original copy side focus A.Thereby, require the change of illumination light quantity distribution in this scope little.
In addition, the datum mark 5a in optical axis Z1 and the lighting device 5 apart from x1 be set to than the basic point 6a in optical axis Z1 and the lighting device 6 apart from the also little 0.3mm of x2.
The field depth characteristic (illumination depth characteristic) that Fig. 3 shows the paper feeding type image read-out of making as described above (embodiment) and adopts the paper feeding type image read-out of structure shown in Figure 8 (example in the past).Fig. 3 is the curve chart of showing apart from the relation of the height dL on the surface of original copy supporter 18 and various relative light quantities.
In the relative light quantity distribution curve (● and solid line) of example in the past, as original copy shift in position width P ± the 0.3mm scope in, produce about 5% light quantity change.Relative therewith, the light quantity change in the relative light quantity distribution curve of embodiment (zero and solid line) is about 2% and in the extreme little.
At this, the light quantity distribution of embodiment can obtain with the synthetic of relative light quantity distribution of adopting lighting device 6 from the relative light quantity distribution that adopts lighting device 5.
In addition, relative light quantity shown in Figure 3 is the relative light quantity when being benchmark with maximum separately light quantity for from the light quantity distribution of the illumination light of lighting device 5, the illumination light quantity distribution from lighting device 6, the light quantity distribution that obtains in an embodiment and the light quantity distribution that obtains in example in the past.
Fig. 4 shows the curve chart with the relation of the relative light quantity during as benchmark the irradiation light quantity of 1 lighting device apart from the height dL on the surface of original copy supporter 18.
In example in the past because make the focal position unanimity of 2 lighting devices, so the peak value light quantity of the synthetic light quantity distribution that they obtain greatly to 2.0, and the acuteness of light quantity distribution is big.Therefore, because of the offset light quantity drastic change of original copy.
In contrast, in an embodiment, peak value light quantity (1.91) was though than example was smaller in the past, and the acuteness of light quantity distribution curve is little, the reduction that is changed significantly of the light quantity in the depth of field of lens arra 2.That is, even produce the offset of original copy, the change of light quantity is also little.Thereby the error that reads light quantity is also little.In addition, if the peak value light quantity is 1.9, then can carry out reading at a high speed fully.
If adopt execution mode 1, because from the original copy side focus A of lens arra 2 intersection points B and C are staggered, all can obtain light quantity distribution curve stably.
In addition, because when the depth of field of lens arra 2 is set to a, when being set at the deviation size of original copy side focus A and intersection points B and C smaller or equal to a/2,90% value width from the light quantity distribution curve of each illumination light of lighting device 5 and 6 is set to more than or equal to a, if so be set to 1 from the peak value light quantity of each irradiates light of lighting device 5 and 6, the peak value light quantity that then is radiated at the light on the original copy is at least 1.8.Thereby, can obtain sufficient light quantity, can carry out high speed and read.In contrast, if deviation size surpasses a/2, even then replenish from the irradiates light of lighting device 5 with from the irradiates light of lighting device 6, also there is the possibility that can not obtain sufficient peak value light quantity in the perhaps not enough a of 90% of light quantity distribution curve value width.
The size of skew it is desirable in ± a/2, even but have some changes also can obtain same effect in this scope as mentioned above when the depth of field is set to a.
Promptly, in present embodiment 1, because not only the original copy side focus A from lens arra 2 staggers intersection points B and C, and stipulate its bias size aptly and from the light quantity distribution curve of the irradiates light of lighting device 5 and 6, so when guaranteeing synthetic fully light quantity, can obtain light quantity distribution curve stably.
(execution mode 2)
Below, embodiments of the present invention 2 are described.Fig. 5 is a sectional drawing of showing the CIS unit formation of embodiment of the present invention 2.And then, on the inscape identical, mark prosign with execution mode shown in Figure 11.
In the present embodiment, the height h1 of the basic point 5a on the surface of range sensor array 3 is also lower than the height h2 of the basic point 6a of range sensor array 3.And then, even in the present embodiment, also be lighting device 5 intersection points B that is configured to its optical axis Z2 and optical axis Z1 than the original copy side focus A of lens arra 2 near lens arra 2, the intersection point C that lighting device 6 is configured to its optical axis Z3 and optical axis Z1 than the original copy side focus A of lens arra 2 away from lens arra 2.
In addition, even in the present embodiment, configuration lighting device 5 and 6 makes the distance of the distance of focus A and intersection points B and focus A and intersection point C in fact equal mutually.And then if effective depth of field of lens arra 2 is set to a, then the distance of the distance of focus A and intersection points B and focus A and intersection point C is all smaller or equal to a/2.
Even adopt the execution mode 2 that constitutes like this, also can obtain the effect same with execution mode 1.
(execution mode 3)
Below, embodiments of the present invention 3 are described.Fig. 6 is a sectional drawing of showing the CIS unit formation of embodiment of the present invention 3.And then, with the same inscape of execution mode shown in Figure 11 in the identical symbol of mark.
In the present embodiment, optical axis Z1 is identical with the distance of basic point 5a and 5b, and in addition, the basic point 5a on the surface of range sensor array 3 and the height of 5b are also identical, and the part of the lighting device 5 of support frame 1 tilts to the inside, and the part of the lighting device 6 of support frame 1 tilts laterally.Therefore, if compare with execution mode 1, then lighting device 5 and 6 in addition, also rotates optical axis Z2 and Z3 from these lighting device lighting light to the clockwise direction rotation to clockwise direction.Therefore, optical axis Z2 is different with optical axis Z1 angulation with optical axis Z3 with optical axis Z1 angulation.And then, in the present embodiment, also be intersection points B that lighting device 5 is configured to make its optical axis Z2 and optical axis Z1 than the original copy side focus A of lens arra 2 near lens arra 2, the intersection point C that lighting device 6 is configured to make its optical axis Z3 and optical axis Z1 than the original copy side focus A of lens arra 2 away from lens arra 2.
In addition,, also dispose the distance that lighting device 5 and 6 makes focus A and intersection points B, and the distance of focus A and intersection point C is in fact equal mutually even in the present embodiment.And then if effective depth of field of lens arra 2 is set to a, then the distance of the distance of focus A and intersection points B and focus A and intersection point C is all smaller or equal to a/2.
Even adopt the execution mode 3 that constitutes like this, also can obtain the effect same with execution mode 1.
(execution mode 4)
Below, embodiments of the present invention 4 are described.Execution mode 4 has been to use the plate type image scanner (image read-out) of one of execution mode 1 to 3.Fig. 7 is an outward appearance oblique view of showing the plate type image scanner that relates to embodiment of the present invention 4.
In execution mode 4, take in CIS unit 71 in the inside of housing 72, and then in housing 72, be provided for driving the drive motors 74 and the line 75 of CIS unit 71.Glass plate 76 as the original copy supporter stick on housing 72 above.In addition, also can switch at the pressing plate 77 of the end of housing 72 installation original copy.
In the present embodiment that constitutes like this, by driving mechanically drive wire 75 of drive motors 74, the image that moves and read original copy can be gone up at read direction (scanning direction) in CIS unit 71.CIS unit 71 the sensor unit that is assembled with lighting unit integratedly as formation, from the reverberation of light-struck original copy by the lens arra in the CIS unit 71 (not shown) optically focused on the components of photo-electric conversion, by per 1 scan line ground output image information.Can read the image information of picture like this.
In the image analyzer of execution mode 4,,, can export stable image information so be difficult to be subjected to shift in position and the concavo-convex influence that causes by standardized writing paper with squares or lines because be equipped with CIS unit 71.
In fact the applicant has made and the execution mode 4 same image analyzers that constitute, the CONCENTRATION DISTRIBUTION of the reading images that obtains with this image analyzer is compared with example in the past and is significantly improved, even also can obtain good reading images under irregular situation on the original copy.And then, because light quantity improves,, can obtain preferable image so improved about 2 times even the reading speed of scanner is compared with the past.
Below, the light quantity that obtains under the situation that adopts patent documentation 2 described formations (conventional art) is described.Figure 10 shows the ideograph of patent documentation 2 described formations.In addition, Figure 11 is a curve chart of showing the light quantity distribution curve that obtains with formation shown in Figure 10.
In this constitutes, for can be most desirably to realize patent documentation 2 described goals of the invention, when using the half breadth of light quantity distribution curve of the irradiates light device consistent with the depth of field a of lens arra 12 as lighting device 16a and 16b, the height of determining lighting device 16a and 16b makes the optical axis from the irradiates light of each lighting device begin respectively to be offset a/2 from focus A on the direction parallel with the optical axis of lens arra 12.
Then, constituting in the synthetic light quantity distribution curve (solid line among Figure 11) that obtains like this, the peak value shape is smooth, and the light quantity change dI on the original copy in depth of field a is enhanced about 2%, the peak value shape is smooth, can most desirably realize the planarization of synthetic light quantity distribution.
But,,, increase by 5% when synthetic light quantity only is 1 system than light source when as shown in figure 11 although used 2 light-source systems.Thereby, shown in patent documentation 2 like that, only considering the synthetic light quantity distribution of planarization and only be offset under the state of height of the irradiation unit between the optical axis that read in order to carry out high speed, the synthetic irradiation light quantity on the original copy is insufficient.
If employing the present invention then when can obtaining high irradiation light quantity, can suppress to follow the light quantity that reads of original copy variation in altitude to change.Thereby, can tackle the reading speed high speed in the image read-out of scanner etc.In addition, in field depth, can reduce the CONCENTRATION DISTRIBUTION of reading images.Therefore, the image read-out for high speed scanner etc. is useful.
Claims (10)
1, a kind of image sensor cell has: the 1st and the 2nd lighting device of illumination original copy; To carry out the imaging device of imaging from the reverberation of original copy; Possess and a plurality of above-mentioned reverberation be transformed to the sensor array of the pixel of the signal of telecommunication, it is characterized in that:
The the above-mentioned the 1st and the 2nd lighting device is configured mutually relatively in the both sides of above-mentioned imaging device,
If effective depth of field of imaging device is made as a, then be worth width all more than or equal to a along 90% of the light quantity distribution curve of each lighting device of the optical axis of above-mentioned imaging device,
From the 1st intersection point of the optical axis of the optical axis of the ejaculation light of above-mentioned the 1st lighting device and above-mentioned imaging device than the original copy side focus of above-mentioned imaging device also near on the position of above-mentioned imaging device,
From the 2nd intersection point of the optical axis of the optical axis of the ejaculation light of above-mentioned the 2nd lighting device and above-mentioned imaging device than the original copy side focus of above-mentioned imaging device on the position of above-mentioned imaging device,
The distance of the above-mentioned the 1st and the 2nd intersection point and above-mentioned original copy side focus is all smaller or equal to a/2.
2, the described image sensor cell of claim 1 is characterized in that:
Different with the above-mentioned the 1st and the 2nd lighting device and the distance of above-mentioned imaging device on the vertical direction of the optical axis of above-mentioned imaging device.
3, the described image sensor cell of claim 1 is characterized in that:
Different with the position of the above-mentioned the 1st and the 2nd lighting device on the parallel direction of the optical axis of above-mentioned imaging device.
4, the described image sensor cell of claim 1 is characterized in that:
From the above-mentioned the 1st and the optical axis angulation of the optical axis of the irradiates light of the 2nd lighting device and above-mentioned imaging device different.
5, the described image sensor cell of claim 1 is characterized in that:
The distance of the above-mentioned the 1st and the 2nd intersection point and above-mentioned original copy side focus is in fact equal.
6, a kind of image read-out that possesses image sensor cell, this image sensor cell has: the 1st and the 2nd lighting device of illumination original copy; To carry out the imaging device of imaging from the reverberation of original copy; Possess and a plurality of above-mentioned reverberation is transformed to the sensor array of the pixel of the signal of telecommunication, this image read-out is characterised in that:
The the above-mentioned the 1st and the 2nd lighting device is configured mutually relatively in the both sides of above-mentioned imaging device,
If effective depth of field of imaging device is made as a, then be worth width all more than or equal to a along 90% of the light quantity distribution curve of each lighting device of the optical axis of above-mentioned imaging device,
From the 1st intersection point of the optical axis of the optical axis of the ejaculation light of above-mentioned the 1st lighting device and above-mentioned imaging device than the focus of the original copy side of above-mentioned imaging device also near on the position of above-mentioned imaging device,
From the 2nd intersection point of the optical axis of the optical axis of the ejaculation light of above-mentioned the 2nd lighting device and above-mentioned imaging device than the original copy side focus of above-mentioned imaging device on the position of above-mentioned imaging device,
The distance of the above-mentioned the 1st and the 2nd intersection point and above-mentioned original copy side focus is all smaller or equal to a/2.
7, the described image read-out of claim 6 is characterized in that:
Different with the above-mentioned the 1st and the 2nd lighting device and the distance of above-mentioned imaging device on the vertical direction of the optical axis of above-mentioned imaging device.
8, the described image read-out of claim 6 is characterized in that:
Different with the position of the above-mentioned the 1st and the 2nd lighting device on the parallel direction of the optical axis of above-mentioned imaging device.
9, the described image read-out of claim 6 is characterized in that:
From the above-mentioned the 1st and the optical axis angulation of the optical axis of the irradiates light of the 2nd lighting device and above-mentioned imaging device different.
10, the described image read-out of claim 6 is characterized in that:
The distance of the above-mentioned the 1st and the 2nd intersection point and above-mentioned original copy side focus is in fact equal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2003/015147 WO2005053307A1 (en) | 2003-11-27 | 2003-11-27 | Image sensor unit and image reader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1726695A true CN1726695A (en) | 2006-01-25 |
| CN100409656C CN100409656C (en) | 2008-08-06 |
Family
ID=34631275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003801006170A Expired - Fee Related CN100409656C (en) | 2003-11-27 | 2003-11-27 | Image sensor unit and image reacter |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3885088B2 (en) |
| CN (1) | CN100409656C (en) |
| AU (1) | AU2003304671A1 (en) |
| TW (1) | TWI250782B (en) |
| WO (1) | WO2005053307A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860647A (en) * | 2009-04-02 | 2010-10-13 | 精工爱普生株式会社 | Image read-out and control device thereof, program, control method |
| CN102292971A (en) * | 2009-01-21 | 2011-12-21 | 夏普株式会社 | Lighting device, image reader, and image forming device |
| CN108462830A (en) * | 2017-02-22 | 2018-08-28 | 佳能株式会社 | The control method of photographic device and photographic device |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010109652A (en) | 2008-10-30 | 2010-05-13 | Pfu Ltd | Lighting equipment and image reader |
| JP4883101B2 (en) | 2009-02-02 | 2012-02-22 | ブラザー工業株式会社 | Image reading device |
| EP2521346A4 (en) | 2009-12-28 | 2015-07-29 | Canon Components Kk | Contact-type image sensor unit and image reading device using same |
| JP5139507B2 (en) | 2010-12-10 | 2013-02-06 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus |
| JP5204207B2 (en) | 2010-12-17 | 2013-06-05 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus using the same |
| JP5244952B2 (en) | 2010-12-21 | 2013-07-24 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus |
| JP5384471B2 (en) | 2010-12-28 | 2014-01-08 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus |
| JP5400188B2 (en) | 2011-05-11 | 2014-01-29 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus and image forming apparatus using the same |
| JP5384707B2 (en) | 2011-08-09 | 2014-01-08 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus using the same |
| JP5536150B2 (en) | 2011-08-09 | 2014-07-02 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus |
| JP5518953B2 (en) | 2011-08-09 | 2014-06-11 | キヤノン・コンポーネンツ株式会社 | Image sensor unit and image reading apparatus |
| JP7040055B2 (en) * | 2018-01-26 | 2022-03-23 | 株式会社リコー | Density correction method in inspection equipment, image reading equipment, image forming equipment and inspection equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03129965A (en) * | 1989-10-14 | 1991-06-03 | Fuji Xerox Co Ltd | Illuminator for picture reader |
| JP2994148B2 (en) * | 1992-07-03 | 1999-12-27 | ウシオ電機株式会社 | Document illumination device |
| JP2848477B2 (en) * | 1992-08-05 | 1999-01-20 | 沖電気工業株式会社 | Optical reader |
| JPH08279885A (en) * | 1995-04-04 | 1996-10-22 | Sankyo Seiki Mfg Co Ltd | Lighting device for image scanner |
| US6178012B1 (en) * | 1998-07-16 | 2001-01-23 | Silitek Corporation | Method and apparatus for keeping a document in focus during noncontact scanning |
-
2003
- 2003-11-27 JP JP2005510912A patent/JP3885088B2/en not_active Expired - Fee Related
- 2003-11-27 AU AU2003304671A patent/AU2003304671A1/en not_active Abandoned
- 2003-11-27 WO PCT/JP2003/015147 patent/WO2005053307A1/en active Application Filing
- 2003-11-27 CN CNB2003801006170A patent/CN100409656C/en not_active Expired - Fee Related
-
2004
- 2004-11-26 TW TW093136588A patent/TWI250782B/en not_active IP Right Cessation
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102292971A (en) * | 2009-01-21 | 2011-12-21 | 夏普株式会社 | Lighting device, image reader, and image forming device |
| CN102292971B (en) * | 2009-01-21 | 2015-01-28 | 夏普株式会社 | Lighting device, image reader, and image forming device |
| CN101860647A (en) * | 2009-04-02 | 2010-10-13 | 精工爱普生株式会社 | Image read-out and control device thereof, program, control method |
| CN108462830A (en) * | 2017-02-22 | 2018-08-28 | 佳能株式会社 | The control method of photographic device and photographic device |
| CN108462830B (en) * | 2017-02-22 | 2021-01-12 | 佳能株式会社 | Image pickup apparatus and control method of image pickup apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200526010A (en) | 2005-08-01 |
| JPWO2005053307A1 (en) | 2007-06-21 |
| TWI250782B (en) | 2006-03-01 |
| WO2005053307A1 (en) | 2005-06-09 |
| JP3885088B2 (en) | 2007-02-21 |
| CN100409656C (en) | 2008-08-06 |
| AU2003304671A1 (en) | 2005-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1192286C (en) | Image sensor and pick-up device | |
| CN1726695A (en) | Image sensor unit and image reacter | |
| CN1184794C (en) | Structure for preventing external light entering in image read device | |
| CN1702484A (en) | Light guide, line-illuminating device, and image-reading device | |
| CN1187948C (en) | Image reading device | |
| CN1199084C (en) | Line lighting device | |
| CN1266923C (en) | Linear illuminator and image sensor | |
| US8854700B2 (en) | Image reading apparatus | |
| CN100345434C (en) | Substrate inspection apparatus | |
| CN1831423A (en) | Linear lighting device and image access device using thereof | |
| CN1243271C (en) | Illuminating apparatus and image reading apparatus | |
| CN1205588C (en) | Image reading apparatus | |
| CN1723688A (en) | Optical conduction unit and image reader using the same | |
| CN1813207A (en) | Light guide and line illuminator | |
| CN1306345C (en) | Image read device | |
| CN1189012C (en) | Image processor, its image reader and fiber lens, and method for manufacturing fiber lens | |
| CN201467255U (en) | Rapid note scanning device | |
| CN1309239C (en) | Image reading apparatus and transmitting original illuminating apparatus | |
| JP2004126284A (en) | Image read unit and image reader | |
| CN1299228C (en) | Transmission-type manuscript fetch device and lighting device thereof | |
| US8247757B2 (en) | Contact image sensor module with wedge-shaped glass plate for guiding light | |
| CN1472953A (en) | Iage reading device | |
| JP2006174038A (en) | Image sensor unit | |
| JP5118083B2 (en) | Dual mirror lighting system for book copier | |
| CN1188726C (en) | Optical camera lens device of image scanner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080806 Termination date: 20211127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |