WO2016104366A1 - ラインセンサ、画像読取装置、画像形成装置 - Google Patents
ラインセンサ、画像読取装置、画像形成装置 Download PDFInfo
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- WO2016104366A1 WO2016104366A1 PCT/JP2015/085497 JP2015085497W WO2016104366A1 WO 2016104366 A1 WO2016104366 A1 WO 2016104366A1 JP 2015085497 W JP2015085497 W JP 2015085497W WO 2016104366 A1 WO2016104366 A1 WO 2016104366A1
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- 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
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- 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
- H04N1/0282—Using a single or a few point light sources, e.g. a laser diode
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
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- 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
- H04N1/02895—Additional elements in the illumination means or cooperating with the illumination means, e.g. filters
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- 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
- H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
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- H—ELECTRICITY
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- 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
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- H04N23/12—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths with one sensor only
Definitions
- the present invention is applied to a line sensor including a light receiving element array including a plurality of light receiving elements arranged in a first direction, a plurality of transmission parts arranged corresponding to the plurality of light receiving elements, and the line sensor.
- the present invention relates to an image reading apparatus and an image forming apparatus.
- an image sensor in which R (red), G (green), and B (blue) color filters are coated on a light receiving element is known. Yes.
- the image sensor include a CCD (Chaged Coupled Device) image sensor and a CMOS (Complementary Metal Oxide Semiconductor) image sensor.
- the original When reading an original, the original is irradiated with light using a light source for reading the original, and reflected light from the original is received by a light receiving element in the image sensor.
- the light receiving elements in the image sensor are arranged in a line corresponding to the desired number of pixels in the main scanning direction, and three light receiving element lines are arranged in the sub scanning direction at a desired interval.
- the main scanning direction is a direction in which the light receiving elements are arranged in a line
- the sub-scanning direction is a direction orthogonal to the main scanning direction.
- the R, G, and B color filters transmit only light having a wavelength corresponding to each color. Reflected light from the original is separated into light corresponding to each color by the R, G, and B filters. A color image can be read by the light receiving element receiving light corresponding to each color (Patent Document 1).
- Patent Document 2 a configuration in which R, G, B color filters are periodically arranged in the main scanning direction of the light receiving element array is also known.
- FIG. 25 is a diagram for explaining a problem of an image sensor in which R, G, and B color filters are periodically arranged in the main scanning direction as in Patent Document 2.
- R, G, and B after the numbers of the photodiodes 20 and the color filters 30 that are the light receiving elements indicate colors corresponding to the photodiodes and the color filters. Note that in the case of general explanation not related to each color, the reference numerals R, G, and B are omitted (the same applies hereinafter).
- the incident angle of light incident on the photodiode 20 may be inclined with respect to the light receiving element surface.
- a problem of “color mixing” occurs in which light that has passed through a color filter 30 different from the color filter 20 corresponding to the light receiving element is incident on the light receiving element.
- the photodiode 20G for receiving green light receives not only the light L1 that has passed through the green color filter 30G but also the light L2 that has passed through the adjacent blue color filter 30B. I'm stuck. For this reason, the photodiode 20G receives light of green and blue colors. As a result, an image having a color different from that of the original image is read. Such a phenomenon is called “mixed color”.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a line sensor capable of suppressing color mixture, an image reading apparatus using the line sensor, and an image forming apparatus.
- a line sensor of the present invention for solving the problem includes a light receiving element array including a plurality of light receiving elements arranged in a first direction, a plurality of transmission portions arranged corresponding to the plurality of light receiving elements,
- the plurality of transmission units include a first transmission unit that transmits light having a first wavelength, and a second transmission unit that transmits light having a wavelength different from the first wavelength.
- the plurality of light receiving elements arranged in the first direction includes a first light receiving element corresponding to the first transmission portion, and the first light receiving element on the center side of the light receiving element row.
- a second light receiving element corresponding to the second transmission part provided adjacently, and the center of the first transmission part is the center of the light receiving element row with respect to the center of the first light receiving element It is characterized by being displaced in the direction of.
- the present invention it is possible to provide a line sensor capable of suppressing color mixing, and an image reading apparatus and an image forming apparatus using the line sensor.
- FIG. 2 is a cross-sectional view illustrating an internal configuration of the document reading apparatus 100 according to Embodiment 1.
- FIG. FIG. 2A is a diagram showing the arrangement of color filters in each light receiving element array.
- FIG. 2B is a plan view of three pixels of the GBR at the left end portion of the line 3 in FIG.
- FIG. 2C is a cross-sectional view at a position X in FIG. 2 is an equivalent circuit diagram of the CMOS sensor in Embodiment 1.
- FIG. 3 is a block diagram illustrating a configuration of a control unit of the document reading apparatus according to Embodiment 1.
- FIG. 3 is a control flowchart of a CPU according to the first embodiment.
- FIG. 6 is a diagram schematically illustrating an optical path when light reflected from a document is incident on a CMOS sensor in a reduction optical system. It is a figure explaining the shift amount of a color filter and a micro lens. It is a figure explaining the positional relationship of a color filter and a photodiode in the center part of a light receiving element row
- FIG. 9A is an explanatory diagram when the gate electrode is arranged in the main scanning direction.
- FIG. 9B is a cross-sectional view at a position X in FIG.
- FIG. 10A is a diagram showing a positional relationship between a color filter and a microlens as a comparative example (left end).
- FIG. 9A is an explanatory diagram when the gate electrode is arranged in the main scanning direction.
- FIG. 9B is a cross-sectional view at a position X in FIG.
- FIG. 10A is a diagram
- FIG. 10B is a cross-sectional view at a position X in FIG.
- FIG. 10C is a diagram showing the positional relationship between a color filter and a microlens as a comparative example (near the center).
- FIG. 10D is a cross-sectional view at a position X in FIG. It is a figure explaining the arrangement
- FIG. 13A is a diagram illustrating an elliptical microlens according to the second embodiment.
- FIG. 13B is a diagram illustrating a perfect circular microlens. It is a figure for demonstrating the multiple interference of incident light.
- FIG. 10 is a diagram for explaining a positional relationship with a color filter, a microlens, and a photodiode in Embodiment 3.
- FIG. 10 is a diagram illustrating a positional relationship with color filters corresponding to a plurality of light receiving element arrays in Embodiment 3. It is a figure explaining the modification of Embodiment 3.
- FIG. 19A is a plan view illustrating the positional relationship between the color filter, the microlens, and the wiring according to the fourth embodiment.
- FIG. 19B is a cross-sectional view at a position X in FIG.
- FIG. 19C is a cross-sectional view at a position Y in FIG.
- FIG. 20A is a plan view for explaining the positional relationship among color filters, microlenses, vertical wirings, and horizontal wirings in a modification of the fourth embodiment.
- FIG. 20B is a cross-sectional view at a position X in FIG.
- FIG.20 (c) is sectional drawing of the position of Y in Fig.20 (a).
- FIG. 21A is a plan view for explaining the positional relationship among color filters, elliptical microlenses, vertical wirings, and horizontal wirings in a modification of the fourth embodiment.
- FIG. 21A is a plan view for explaining the positional relationship among color filters, elliptical microlenses, vertical wirings, and horizontal wirings in a modification of the fourth embodiment.
- FIG. 21B is a cross-sectional view at a position X in FIG.
- FIG.21 (c) is sectional drawing of the position of Y in Fig.21 (a).
- FIG. 22A is a plan view for explaining incident light when an elliptical microlens is used in a modification of the fourth embodiment.
- FIG. 22B is a cross-sectional view at the position Y ′ in FIG. 22A, and is an explanatory diagram of an example in which the opening width W1 of the horizontal wiring and the width W2 of the photodiode are W1> W2.
- FIG. 22C is a cross-sectional view at the position Y ′ in FIG.
- FIG. 10 is a diagram illustrating an arrangement of color filters in each light receiving element row in the fifth embodiment. It is explanatory drawing in the case of reading the curved metal target object. It is a figure explaining color mixing.
- FIG. 1 is a cross-sectional view showing an internal configuration of a document reading apparatus which is an image reading apparatus.
- a known image forming unit 110 is provided under the document reading device 100, and the document reading device 100 and the image forming unit 110 constitute an image forming device.
- An example of the known image forming unit 110 is an electrophotographic image forming unit.
- An electrophotographic image forming unit develops an electrostatic latent image formed on a photosensitive drum into a toner image, and forms the image by transferring the toner image onto a recording medium such as paper.
- the image forming apparatus according to the present embodiment can form an image read by the document reading apparatus 100 on a recording medium by the image forming unit 110.
- a sheet (hereinafter referred to as an original) 102 on which an image is formed as an object to be read is placed.
- a reading start button (not shown)
- the reading unit 103 moves in the direction of the arrow in the figure and reads the document 102.
- the white LEDs 104a and 104b serving as light emitting units disposed above the reading unit 103 are caused to emit light, and the document 102 is irradiated with light.
- the reading unit 103 is a reduction optical system reading unit including LEDs 104a and 104b, a plurality of folding mirrors 105a, 105b, 105c, 105d, and 105e, a condensing lens 106, and a CMOS sensor 107.
- the light irradiated on the original 102 by the LEDs 104 a and 104 b is reflected by the original 102.
- the light reflected from the document 102 is reflected by the folding mirrors 105a, 105b, 105c, 105d, and 105e, and then collected by the condenser lens 106 onto the CMOS sensor 107 that is a line sensor.
- the CMOS sensor 107 includes a light receiving element. The light receiving element photoelectrically converts incident light and outputs an electrical signal corresponding to the amount of incident light.
- FIG. 2 is a diagram for explaining the configuration of the CMOS sensor 107.
- FIG. 2A is a diagram showing the arrangement of color filters for each pixel.
- FIG. 2B is a detailed view of three pixels of the GBR at the left end portion of the line 3.
- FIG. 2C is a cross-sectional view at a position X in FIG. An arrow in FIG. 2C represents incident light.
- one pixel corresponds to one photodiode 1204.
- the CMOS sensor 107 includes a light receiving element array in which photodiodes 1204 (light receiving elements) are arranged in the main scanning direction, and a plurality of color filters 1202 (transmission portions) arranged in correspondence with the light receiving element arrays.
- the photodiode 1204 for one pixel is configured to be smaller than the color filter 1202 for one pixel corresponding to the photodiode 1204.
- the CMOS sensor 107 has a plurality of light receiving element arrays of line 1, line 2, and line 3. Between the color filter 1202 and the photodiode 1204, there is an insulating material (not shown) such as SiO which is called an interlayer film. As shown in FIG.
- a micro lens 1203 (light condensing unit) is disposed on the opposite side of the color filter 1202 from the photodiode 1204.
- the microlens 1203 is disposed corresponding to the photodiode 1204 and has a function of condensing light incident on the photodiode 1204.
- a cover glass (not shown) exists above the microlens 1203.
- Reference numeral 1205 denotes a gate electrode (charge transfer unit) of the pixel transfer transistor.
- the gate electrode 1205 plays a role of transferring photoelectric charges accumulated in the photodiode 1204 to the reading circuit.
- the gate electrode 1205 is made of polysilicon.
- the direction in which the light receiving elements are arranged in a row is the main scanning direction (first direction), and the direction orthogonal to the main scanning direction is the sub-scanning direction (second direction).
- FIG. 3 is an equivalent circuit diagram of the unit pixel.
- the gate electrode 1205 of the pixel transfer transistor plays a role of transferring the photoelectric charge accumulated in the photodiode 1204 to the reading circuit.
- the circuit further includes a photodiode 1204, a gate electrode 1205 of the pixel transfer transistor, a reset transistor 1303 for resetting the pixel signal, a source follower transistor 1304 for amplifying the pixel signal, and a selection transistor 1305 for reading the amplified signal.
- photodiodes 1204 for 7500 pixels in the main scanning direction and three rows in the sub-scanning direction are arranged.
- the resolution in the main scanning direction is 600 dpi.
- Each light receiving element array is arranged with a gap of one pixel in the sub-scanning direction.
- the line 2 acquires an image at a position separated in the sub-scanning direction by 2 pixels with respect to the line 1, and the line 3 by 4 pixels with respect to the line 1.
- the color filter 1202 includes three types of color filters that have different wavelength ranges for transmitting incident light. These are three types of color filters: a filter that transmits red light (1202R), a filter that transmits green light (1202G), and a filter that transmits blue light (1202B).
- the color filters 1202 of the lines 1, 2, and 3 are arranged with a periodic rule of R ⁇ G ⁇ B ⁇ R ⁇ G ⁇ B ⁇ ... In the main scanning direction. .
- RGB color filters are arranged in a so-called staggered pattern.
- the line 2 is arranged so that the regularity of R ⁇ G ⁇ B ⁇ ... Is shifted by one pixel in the main scanning direction with respect to the line 1, and the line 3 is R ⁇ G ⁇ with respect to the line 1.
- the dashed line 1201 is a range representing a unit pixel.
- the pitch of the unit pixel is determined by the specification of the CMOS sensor, and is usually equidistant.
- FIG. 4 is a block diagram of the document reading apparatus 100 according to this embodiment.
- the CPU 401 reads the control program stored in the nonvolatile memory 402 and controls the entire document reading apparatus 100.
- An operation unit 403 is a user interface through which a user inputs a copy mode setting such as color copy, monochrome copy, and double-sided copy, and a copy start instruction.
- the motor 404 moves the reading unit 103 in the sub scanning direction.
- the motor driver 405 receives a timing signal from the CPU 401 and supplies an excitation current for controlling the rotation of the motor 404.
- the LED driver 406 receives a timing signal from the CPU 401 and supplies a current for causing the white LEDs 104a and 104b to emit light.
- the IC 407 performs analog processing such as sample hold processing, offset processing, and gain processing on the analog voltage signal output from the CMOS sensor 107, and converts the analog processed voltage signal into digital data (hereinafter, luminance data).
- the IC 407 is generally called AFE (AnalogFrontEnd). In the present embodiment, this digital data is 8-bit (0 to 255) data.
- Read data output from the AFE 407 is stored in the line memory 409.
- the line memory 409 holds the read data read by each line of the light receiving element array lines 1, 2, and 3 in the CMOS sensor 107 for five lines.
- the data sort unit 410 rearranges the RGB read data.
- the CMOS sensor 107 according to the present embodiment has RGB color filters arranged in a staggered pattern. Therefore, RGB read data is stored in the line memory 409 in a mixed state within one line.
- line 1 and line 2 are arranged 2 pixels apart in the sub-scanning direction, and line 1 and line 3 are arranged 4 pixels apart. Therefore, the read data of line 2 acquired at a certain timing is read data at a position shifted by 2 pixels for line 1 and the read data of line 3 is shifted to the sub-scan by 4 pixels with respect to line 1. Become.
- the data sorting unit 410 rearranges the read data obtained from the line 1, line 2, and line 3 to generate image data of each color of RGB. For example, R processing will be described.
- the data sort unit 410 picks up the R data portion from the image data of each of the lines 1, 2, and 3 stored in the line memory 409. Since the read data of line 1, line 2, and line 3 acquired at a certain timing is shifted in the sub-scanning direction, processing is performed to eliminate this shift. That is, the data acquired at a certain timing is processed so that the read data of line 2 is shifted by 2 pixels in the sub-scanning direction and the read data of line 3 is shifted by 4 pixels in the sub-scanning direction. By performing such processing, there is no deviation in the sub-scanning direction. By performing this processing for each color, the read data read by the CMOS sensor 107 does not shift in the sub-scanning direction and becomes read data corresponding to the image of the original 102.
- the image processing circuit 411 performs image processing such as shading correction processing and filter processing on the read data rearranged by the data sorting unit 410. Note that filter settings and the like necessary for image processing are set in a register in the image processing circuit 411 by the CPU 401 when the power is turned on.
- the parallel / serial conversion circuit 412 converts read data after various image processing output as parallel data from the image processing circuit 411 into serial data.
- the read data converted into serial data is transmitted to the image output controller 413.
- FIG. 5 is a control flowchart of the CPU 401 in this embodiment.
- the CPU 401 When the user turns on the power of the document reading apparatus 100, the CPU 401 performs initial operations such as starting processing of the document reading apparatus control program and adjusting the light amount of the LED light source (starting of the document reading apparatus 100: S500).
- the CPU 401 sets data corresponding to the image processing setting in a register in the image processing circuit 411 (S501).
- the CPU 401 waits for a reading job start command from the operation unit 403 (S502).
- the CPU 401 When a reading job start command is input by the user (Y in S502), the CPU 401 causes the white LEDs 104a and 104b, which are light sources, to emit light (S503).
- the CPU 401 outputs a control signal to the LED driver 406, and the LED driver 406 supplies current to the LEDs 104a and 104b to emit light.
- the CPU 401 outputs a control signal to the motor driver 405, and the motor driver 405 drives the motor 404 to move the reading unit 103 in the sub-scanning direction (S504).
- the CPU 401 turns off the LEDs 104a and 104b and controls the original reading apparatus to be in a job waiting state.
- FIG. 6 is a diagram schematically showing an optical path when light reflected from the original 102 enters the CMOS sensor 107 in the reduction optical system.
- the mirror is omitted for the sake of simplicity.
- the length of the CMOS sensor 107 in the main scanning direction is shorter than the length of the original 102 to be read in the main scanning direction.
- light from the original enters the CMOS sensor 107 substantially perpendicularly at the center of the light receiving element array of the CMOS sensor 107, but light from the original enters the CMOS sensor 107 at the end.
- the incident light is inclined.
- a problem of color mixing occurs when incident light is inclined (see FIG. 25).
- the center of the color filter 1202 is shifted from the center of the photodiode 1204 corresponding to the color filter in order to cope with the inclination of the incident light to the CMOS sensor 107.
- the center of the color filter 1202 is shifted from the center of the photodiode 1204 corresponding to the color filter toward the center of the light receiving element array in the main scanning direction.
- the center of the microlens 1203 is shifted from the center of the photodiode 1204 corresponding to the microlens 1203 toward the center of the light receiving element array in the main scanning direction.
- the light receiving element array includes a photodiode 1204G (first light receiving element), a photodiode 1204B (second light receiving element), and a photodiode 1204R (third light receiving element).
- the photodiode 1204G is a photodiode corresponding to the color filter 1202G (first transmission part).
- the photodiode 1204B is a photodiode corresponding to the color filter 1202B (second transmission portion) provided adjacent to the photodiode 1204G on the center side of the light receiving element array.
- the photodiode 1204R is a photodiode corresponding to the color filter 1202R (third transmission portion) provided adjacent to the photodiode 1204B on the center side of the light receiving element array.
- the center of the color filter 1202G is shifted from the center of the photodiode 1204G toward the center in the main scanning direction of the light receiving element array.
- the center of the color filter 1202B is shifted from the center of the photodiode 1204B toward the center in the main scanning direction of the light receiving element array.
- the center of the color filter 1202R is shifted from the center of the photodiode 1204R toward the center in the main scanning direction of the light receiving element array.
- the plurality of microlenses include a microlens 1203G (first condensing unit), a microlens 1203B (second condensing unit), and a microlens 1203R (third condensing unit).
- the micro lens 1203G is a micro lens corresponding to the photodiode 1204G.
- the micro lens 1203B is a micro lens corresponding to the photodiode 1204B.
- the micro lens 1203R is a micro lens corresponding to the photodiode 1204R.
- the center of the microlens 1203G is shifted from the center of the photodiode 1204G toward the center in the main scanning direction of the light receiving element array.
- the center of the microlens 1203B is shifted from the center of the photodiode 1204B toward the center in the main scanning direction of the light receiving element array.
- the center of the microlens 1203R is shifted from the center of the photodiode 1204R toward the center of the light receiving element array in the main scanning direction.
- the center of the color filter 1202 and the center of the microlens 1203 coincide.
- the reading unit is a reduction optical system, and the light incident on the left end of the CMOS sensor 107 is tilted toward the center in the main scanning direction of the light receiving element array as shown in FIG. Incident.
- the center of the color filter 1202 and the center of the microlens 1203 are shifted from the center of the photodiode 1204 toward the center of the light receiving element array in the main scanning direction. Therefore, the photodiode 1204 can receive light that has passed through the color filter 1202 and the microlens 1203 corresponding to the photodiode 1204. Therefore, the problem of color mixing can be suppressed.
- the shift amount of the color filter 1202 and the micro lens 1203 will be described with reference to FIG.
- the position 120 in FIG. 7 is a first position, and 121, which is the position closer to the center of the light receiving element array than the first position, is the second position.
- the inclination of the light incident on the CMOS sensor 107 increases as it approaches the end of the light receiving element array, and decreases as it approaches the center and becomes closer to vertical. Therefore, the amount by which the center of the color filter 1202 (and the center of the microlens 1203) is shifted in the center direction of the light receiving element row with respect to the center of the photodiode 1204 is larger on the end side of the light receiving element row, The center side of the light receiving element array is made smaller.
- D1G, d1B, and d1R indicate amounts of deviation of the centers of the color filters 1202G, B, and R from the centers of the corresponding photodiodes 1204G, B, and R at the first position.
- d2G, d2B, and d2R indicate amounts of deviation of the centers of the color filters 1202G ′, B ′, and R ′ from the centers of the corresponding photodiodes 1204G ′, B ′, and R ′ at the second position. .
- Each shift amount is d1G> d1B> d1R> d2G> d2B> d2R.
- the amount of deviation between the center of the color filter 1202G and the center of the photodiode 1204G at the first position is larger than the center of the color filter 1202G 'and the center of the photodiode 1204G' at the second position.
- the amount of deviation between the center of the microlens 1203G and the center of the photodiode 1204G at the first position is larger than the center of the microlens 1203G 'and the center of the photodiode 1204G' at the second position.
- the amount of deviation between the center of the color filter 1202G and the center of the photodiode 1204G is larger than the amount of deviation between the center of the color filter 1202B and the center of the photodiode 1204B. large.
- the amount of deviation between the center of the color filter 1202B and the center of the photodiode 1204B is larger than the amount of deviation between the center of the color filter 1202R and the center of the photodiode 1204R.
- the amount of shift of the color filter 1202 (microlens 1203) optimum for color mixing can be set according to the irradiation angle of light to the light receiving element array.
- the center of the color filter 1202B and the photodiode 1204B coincide. Since the pitch interval Z2 of the color filter is smaller than the pitch interval Z1 of the pixel, the shift amount between the color filter 1202 and the micro lens 1203 becomes larger toward the end of the light receiving element array in the main scanning direction.
- d1G> d1B> d1R> d3G> d3B> d3R> d4G from the center to the left end side in the main scanning direction of the light receiving element array.
- d5R> d5B> d5G> d4R from the center to the right end side in the main scanning direction of the light receiving element array.
- the amount of deviation between the color filter 1202 and the microlens 1203 is proportional to the distance from the center to the position.
- the shift amount of the pixel located in the middle between the left end portion and the center portion of the light receiving element array is approximately half the shift amount of the left end portion.
- the color filter 1202 is similarly arranged on the right side of the center of the light receiving element array with being shifted from the photodiode 1204 toward the center of the light receiving element array in the main scanning direction. Has been.
- the photodiode 1204 and the gate electrode 1205 are connected in the sub-scanning direction and are disposed within a range 1201 indicating a pixel (see FIG. 2B).
- FIG. 9A shows an explanatory diagram when the gate electrode 1205 is arranged in the main scanning direction.
- FIG. 9B is a cross-sectional view at the position X in FIG. For the purpose of illustration, only one incident light is shown. As shown in FIG. 9B, due to the difference in refractive index between the polysilicon and the interlayer film, the light incident on the gate electrode 1205 of the pixel transfer transistor changes its path and enters the unit pixel of a different color. There is. As a result, the problem of color mixing occurs.
- the microlenses 1203G, 1203B, and 1203R are shifted to the CMOS sensor center side together with the color filters 1202G, 1202B, and 1202R.
- color mixing and sensitivity variations are reduced.
- FIGS. 2B and 2C and FIGS. 10A to 10D show the positional relationship (plan view) between the color filter and the microlens 1203 in this embodiment.
- FIGS. 10A to 10D show the positional relationship between a color filter 1202 and a microlens 1203 as a comparative example.
- FIG. 10A to 10D is disposed at the same position as the photodiode 1204, and the microlens 1203 is displaced from the photodiode 1204.
- the microlens 1203 has a larger amount of deviation at the end of the light receiving element array, and the amount of deviation is smaller as it approaches the center.
- 10A and 10B show the left end portion of the light receiving element array
- FIGS. 10C and 10D show the vicinity of the central part of the light receiving element array.
- FIG. 10A corresponds to FIG. 2B
- FIG. 10B corresponds to FIG.
- FIG. 10B is a cross-sectional view at the position X in FIG. FIG.
- FIG. 10D is a cross-sectional view at the position X in FIG.
- the incident light passing through the regions A and A ′ is considered.
- the areas A and A ′ have the same area and have the same positional relationship with the position of the microlens 1203G.
- the light passing through the region A is a single color filter 1202G. Pass through.
- the light passing through the region A ′ passes through both 1202G and 1202B.
- FIG. 10 (a) (b) is compared with FIG. 10 (c) (d).
- the amount of deviation between the micro lens 1203 and the color filter 1202 (and the photodiode 1204) is smaller in the vicinity of the center than in the left end of the light receiving element array. Therefore, the ratios of G and B that occupy the region A ′ are also different. For this reason, the color mixture ratio differs depending on the end portion and the vicinity of the center.
- the light may enter the gate electrode 1205.
- polysilicon of a high refractive material is used for the gate electrode 1205, and polysilicon has a large wavelength dependency.
- the color filter 1202G is described as the first transmission unit
- the color filter 1202B is described as the second transmission unit
- the color filter 1202R is described as the third transmission unit.
- the relationship between each color and the color filter is relative. The relationship is not limited to this.
- the color filter 1202B may be the first transmission part, or the color filter 1202R may be the first transmission part.
- the first light receiving element and the first light collecting unit have a relative relationship with each color of the color filter.
- FIG. 11 is a simplified diagram of FIG. 2C for explaining the effect of the arrangement of the microlens 1203.
- the adjacent microlenses 1203 are arranged so as to contact each other.
- the R, G, and B color filters 1202 are formed, so that the size of the color filter for each color is manufactured in the manufacturing process. Deviation is likely to occur.
- the R, G, and B color filters are made of different materials, and thus different process steps are formed. For example, a process of forming an R color filter, a process of forming a G color filter, and a process of forming a B color filter are sequentially performed. Therefore, an alignment error at the time of manufacturing each color filter and a pattern size error due to photolithography may occur in manufacturing, and the sizes of the R, G, and B color filters may be slightly different.
- the microlens 1203 is formed of the same material and in the same process step, alignment errors and pattern size errors are unlikely to occur. Therefore, the microlens 1203 can be stably manufactured in the same size, and can be arranged at the same interval when arranged in the color filter. As a result, the size of the color filter 1202 may differ from the microlens 1203 as shown in FIG.
- the position of the boundary between adjacent color filters with respect to the micro lens 1203 is likely to fluctuate.
- there is only one color in the same line there is no problem that the size of the color filter for each color is different.
- the number of colors is small as compared with the case where three color filters are present on the same line as in the present embodiment, so that the above-described problem hardly occurs.
- the incident light 1209 at the end of the micro lens 1203 passes through the end of the color filter 1202.
- the color of the color filter through which the incident light that has passed through the end of the microlens 1203 also varies.
- the incident light that passes through the end of the microlens 1203B will be described with reference to FIG.
- Incident light 1208 passes through the blue color filter 1202B
- incident light 1209 passes through the red color filter 1202R.
- both the incident light 1208 'and the incident light 1209' pass through the blue color filter 1202B '.
- the amount of light passing through the color filter 1202B (1202B ') varies, thereby causing a problem of color mixing.
- a gap is provided between the microlenses 1203 so that the light collected by the microlens 1203 does not pass through the adjacent color filter 1202.
- the incident lights 1208 and 1208 'pass through the blue color filter 1202B As shown in FIG. 11, the incident lights 1208 and 1208 'pass through the blue color filter 1202B. Note that light that does not pass through the microlens 1203 (incident light 1209 and 1209 ′ in FIG. 11) is shielded by a wiring or the like provided between the microlenses and does not reach the photodiode 1204.
- Embodiment 2 according to the present invention will be described with reference to FIGS. 13 (a) and 13 (b).
- the second embodiment is the same as the first embodiment except that the shape of the microlens 1203 is changed. Therefore, the description of the same configuration is omitted.
- FIG. 13A is a plan view of the present embodiment. Note that description of the photodiode 1204 and the gate electrode 1205 is omitted.
- the microlens 1203 according to the second embodiment has an elliptical shape, and has a larger curvature radius in the sub-scanning direction than the curvature radius in the main-scanning direction when viewed from a direction orthogonal to the main-scanning direction and the sub-scanning direction. It is supposed to be.
- FIG. 13B shows an example in which a perfect circle microlens 1203 having the same radius of curvature in the main scanning direction and the sub-scanning direction is arranged.
- the area covered with the microlens 1203 is made larger than that in FIG. 13B.
- FIG. 14 is a diagram for explaining the multiple interference of incident light, and shows only the color filter 1202 and the cover glass 1206 provided on the color filter 1202. A part of light incident on a flat area of the color filter 1202 that is not covered by the spherical microlens 1203 is reflected by the surface of the color filter 1202. The reflected light is reflected between the color filter 1202 and the carver glass 1206 to cause a ghost. When a ghost occurs, an image different from the original image is read as a read image.
- the size of the microlens in the main scanning direction has a limit in increasing the size because the microlenses are provided adjacent to each other.
- the sub-scanning direction can be increased because there is no restriction. Therefore, the area of the microlens 1203 with respect to the color filter 1202 can be increased by forming an elliptical shape in which the main scanning direction has a short diameter and the sub-scanning direction has a long diameter.
- FIG. 15 shows an example in which the center of the micro lens 1203 is shifted from the center of the photodiode 1204 and the center of the color filter 1202 is not shifted from the center of the photodiode 1204.
- the region B ′ between the microlens 1203G and the microlens 1203B that causes multiple interference of incident light is only the color filter 1202B. Since the light reflected by the color filter 1202 of the same color is likely to cause interference, the configuration shown in FIG. 15 is likely to cause multiple interference.
- this embodiment in the case of this embodiment as shown in FIG. 13A, in the corresponding region B, there are two colors of the color filters 1202G and 1202B, so that the influence of multiple interference can be reduced.
- Embodiment 3 according to the present invention will be described with reference to FIG. 16, FIG. 17, and FIG.
- the third embodiment is the same as the first embodiment except that the shape of the color filter 1202 is changed. Therefore, the description of the same configuration is omitted.
- FIG. 16 is a plan view of three pixels of the GBR of the CMOS sensor according to the third embodiment.
- FIG. 17 is a diagram for explaining the positional relationship of the color filters 1202 corresponding to a plurality of lines of light receiving element arrays.
- the color filter 1202 is enlarged in the sub-scanning direction, and the area between the light-receiving element rows in the sub-scanning direction is also covered with the color filter 1202. This is a feature of Form 3.
- the color filter 1202 since the color filter 1202 is not large in the sub-scanning direction in the first embodiment, the color filter 1202 does not exist in the region between the light receiving element rows as shown in FIG.
- the color filter 1202 covers the gate electrode 1205 of the pixel transfer transistor.
- L1 the width in the sub-scanning direction
- L1 ⁇ L2 the width in the sub-scanning direction
- Wirings such as power supply lines and signal lines are arranged in a region between the light receiving element rows and the light receiving element rows, and a ghost may be generated by light reflected on these wires.
- the color filter 1202 since the color filter 1202 is also present in the region between the light receiving element rows, the light intensity can be reduced by passing light through the color filter in the region. it can. Therefore, since the intensity of light reflected from the wiring in the direction of the color filter 1202 becomes weak, ghost can be reduced.
- FIG. 18 is a diagram for explaining a modification of the third embodiment, in which the microlens 1203 has an elliptical shape.
- the color filter 1202 is larger than the microlens 1203.
- Embodiment 4 according to the present invention will be described with reference to FIG. 19, FIG. 20, FIG. 21, and FIG.
- the fourth embodiment is the same as the first embodiment except that the configuration of the wiring 1207 (or the vertical wiring 1406 and the horizontal wiring 1407) as a wiring portion is clarified with respect to the first embodiment. Therefore, the description of the same configuration is omitted.
- FIG. 19 is a diagram illustrating a configuration of three pixels of the GBR of the CMOS sensor according to the fourth embodiment.
- 19A is a plan view
- FIG. 19B is a cross-sectional view at a position X in FIG. 19A
- FIG. 19C is a cross-sectional view at a position Y in FIG. 19A.
- the wiring 1207 is provided so as to surround the photodiode 1204.
- Light that has passed through the color filter 1202 passes through an opening formed by the wiring 1207 and enters the photodiode 1204.
- the fourth embodiment is characterized in that the opening formed by the wiring 1207 is larger than the photodiode 1204 in the sub-scanning direction. That is, as shown in FIG. 19C, the opening width W1 of the wiring 1207 is larger than the width W2 of the photodiode 1204 in the sub-scanning direction (W1> W2).
- the opening width W3 of the wiring 1207 is narrower than the width W4 of the photodiode 1204 in the main scanning direction (W3 ⁇ W4). This is because the pixel pitch between adjacent pixels is narrow and from the viewpoint of color mixing suppression.
- FIG. 20 is a diagram illustrating another example of the configuration of the three pixels of the GBR of the CMOS sensor according to the fourth embodiment.
- 20A is a plan view
- FIG. 20B is a cross-sectional view at a position X in FIG. 20A
- FIG. 20C is a cross-sectional view at a position Y in FIG. 20A.
- the opening is formed by a vertical wiring 1406 extending in the sub-scanning direction and a horizontal wiring 1407 extending in the main scanning direction.
- the horizontal wiring 1407 is closer to the color filter 1202 by H1 than the vertical wiring 1406 in the Z direction (the third direction orthogonal to the first direction and the second direction). Placed on the side.
- the opening width W1 of the horizontal wiring 1407 is larger than the width W2 of the photodiode 1204.
- FIG. 21 is a diagram illustrating another example of the configuration of the three GBR pixels of the CMOS sensor according to the fourth embodiment.
- the microlens 1203 has an elliptical shape that is long in the sub-scanning direction.
- the color filter 1202 is also elongated in the sub-scanning direction in accordance with the shape of the microlens 1203.
- the horizontal wiring 1407 is configured closer to the microlens 1203 by H1 than the vertical wiring 1406 in the Z direction.
- the opening width W1 of the horizontal wiring 1407 is larger than the width W2 of the photodiode 1204.
- the opening width W1 of the wiring 1207 (or the horizontal wiring 1407) is larger than the width W2 of the photodiode 1204 in the sub-scanning direction. Therefore, the light that has passed through the color filter 1202 is not easily blocked by the wiring 1207 (or the horizontal wiring 1407), and a decrease in sensitivity of the photodiode 1204 is suppressed. Further, even when an alignment shift occurs between the wiring 1207 (or the horizontal wiring 1407) and the photodiode 1204 during manufacturing, variations in sensitivity of each sensor can be suppressed.
- the relationship between W1 and W2 is preferably 1.01 ⁇ W2 ⁇ W1 ⁇ 1.5 ⁇ W2.
- FIG. 22 shows a schematic diagram of incident light (arrow) when the elliptical microlens shown in FIG. 21 is used.
- FIG. 22A is a plan view. In FIG. 22, for the sake of simplicity of explanation, an example in which the color filter 1202G and the photodiode 1204G are not shifted in the X direction will be described.
- the opening W1 of the horizontal wiring 1507 has a relationship of W1> W2.
- FIG. 22C the opening W1 of the horizontal wiring 1507 has a relationship of W1 ⁇ W2.
- the power in the sub-scanning direction is An elliptical microlens is smaller than a perfect circle microlens.
- Embodiment 5 according to the present invention will be described with reference to FIG.
- the CMOS sensor 107 has three light receiving element rows of line 1, line 2, and line 3, whereas in the fifth embodiment, a light receiving element row of line 4 is further provided. Is different from the first embodiment. Differences from the first embodiment will be described, and the description of the same configuration as that of the first embodiment will be omitted.
- FIG. 23 is a diagram for explaining the arrangement of color filters of the CMOS sensor 107 according to the fifth embodiment.
- the line 1, line 2, and line 3 are arranged with a periodic rule of R ⁇ G ⁇ B ⁇ R ⁇ G ⁇ B ⁇ ... In the main scanning direction. ing.
- G color filters 1202G (fourth transmission portions) are continuously arranged in the main scanning direction without any periodic rule.
- the fifth embodiment includes a switching unit that switches between a first mode in which reading is performed using line 1, line 2, and line 3 and a second mode in which reading is performed using line 4 when a monochrome image is read. ing.
- the light is incident on the photodiode 1204G corresponding to the green color filter (color filter 1202G) of line 1, line 2, and line 3. Reading is performed on the basis of the light.
- a curved metal object for example, a spray can
- FIG. 24 is a cross-sectional view showing how a curved metal object is read.
- the folding mirror 105a of FIG. 24 is a cross-sectional view showing how a curved metal object is read.
- the reflectance of the metal light is high, the light irradiated from the white LEDs 104a and 104b is regularly reflected on the surface of the metal object, and the luminance information obtained by the photodiode 1204 of the CMOS sensor 107 is very high.
- (I) is the position where the metal object is flat. Therefore, even if regular reflected light is incident on the CMOS sensor 107, the reflected light is uniformly incident on the lines 1, 2, and 3 of the CMOS sensor 107.
- the position (II) is a position where the metal object is curved. Since the optical system of the reading unit is designed assuming a flat object, reflected light may not be uniformly incident on the lines 1, 2, and 3 of the CMOS sensor 107 when reading a curved object. . For this reason, when a metal object is read, specular reflection light may be incident only on the line 1, and specular reflection light may not be incident on the other lines.
- line 1 is an R-only color filter
- line 2 is a G-only color filter
- line 3 is a B-only color filter
- regular reflection light is incident only on line 1
- the region (II) is a read image having a higher R luminance than G and B. In other words, it becomes a read image colored in red, and an image of a color significantly different from the original.
- color mixing occurs in which light that has passed through adjacent color filters 1202B and 1202R enters the photodiode 1204G.
- color mixture correction can be controlled based on information obtained from all photodiodes 1204 corresponding to RGB of line 1, line 2, and line 3.
- information is acquired only from photodiodes 1204 corresponding to G of line 1, line 2, and line 3 in order to increase the reading speed. For this reason, it is not possible to control color correction. Therefore, when reading a monochrome image, there is a possibility that image information cannot be acquired appropriately.
- color mixing problem does not occur because color filters 1202G are arranged in the main scanning direction.
- the line 2 and the line 3 is influenced by the positional accuracy of the color filter 1202, the photodiode 1204 and the like at the time of manufacture. Accordingly, color mixing is likely to occur in a CMOS sensor of a certain manufacturing lot, but color mixing is unlikely to occur in a CMOS sensor 107 of another manufacturing lot.
- the CPU 401 when reading a monochrome image, the CPU 401 reads using the line 1, line 2, and line 3 (reading in the first mode) or reads using the line 4 (second). (Reading in the mode) can be selected and controlled.
- a program for determining whether reading in the first mode or reading in the second mode is stored in the nonvolatile memory 402 that stores the control program of the CPU 401 before shipping the product to the factory. Keep it. By doing in this way, the optimal monochrome image reading can be set according to the individual difference of the CMOS sensor.
- the nonvolatile memory 402 may store both programs for reading in the first mode and the second mode. It is also possible to adopt a method of separately providing a determination flag for which program to execute in the nonvolatile memory 402 or a method of selecting which program to execute by a mechanical switch provided on the board. is there.
- the example which sets the 1st mode and the 2nd mode beforehand was demonstrated before factory shipment, it is not restricted to this.
- the user may switch between reading in the first mode and reading in the second mode by operating the operation unit 403 which is a user interface.
- CMOS sensors when reading a color image, reading is performed using line 1, line 2, and line 3, and when reading a monochrome image, reading is performed using line 4. You may set as follows.
- the center of the color filter 1202 and the center of the photodiode 1204 are not necessarily shifted from each other as long as color mixture correction control when reading a color image is sufficient. That is, when reading a color image, reading is performed using line 1, line 2, and line 3 in consideration of reading of a curved metal object. When a monochrome image is read, the color mixture correction cannot be performed, and the line 4 is used for reading.
- the color filter 1202 of the line 4 is the same as the color filter 1202G provided in the line 1, line 2, and line 3 (the wavelength of the light transmitted by the color filter 1202 of the line 4, the line 1, The wavelength of light transmitted through the second and third color filters 1202G is the same), but is not limited thereto.
- the color filter 1202 may be lighter green than the color filter 1202G provided on the line 1 or the like, or a transparent color filter may be used. May be.
- the present invention is not limited to this.
- a configuration using two color filters may be used.
- the center of the color filters of all three colors is shifted from the center of the photodiode.
- the center of the color filter is shifted from the center of the photodiode only in the end region of the light receiving element row where color mixing is likely to occur, and the central region and intermediate region (region between the central region and the end region) of the light receiving element row are shifted. It may not be possible.
- CMOS sensor is described as the line sensor
- another type of sensor such as a CCD (charge coupled device) sensor
- CCD charge coupled device
- an example of an electrophotographic image forming apparatus is shown as an image forming apparatus to which the line sensor according to the present embodiment is applied, the present invention is not limited to this.
- the line sensor according to this embodiment may be applied to an ink jet printer that ejects ink to form an image on a sheet.
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Abstract
Description
図6は、縮小光学系において、原稿102から反射する光がCMOSセンサ107に入射される際の、光路を模式的に表した図である。説明を簡単にするためミラーは省略している。
図11、図12を用いて、隣接するマイクロレンズ1203が間隔をあけて配置されていることによる効果を説明する。
上述した実施形態では、3色のカラーフィルタを用いた例で説明をしているが、これに限られるものではない。例えば、2色のカラーフィルタを用いるような構成でもよい。また、3色すべてのカラーフィルタの中心をフォトダイオードの中心からずらすような構成としているが、3色のカラーフィルタのうち混色の問題が発生しやすい2色だけずらすようにしてもよい。また、混色が発生しやすい受光素子列の端部領域のみカラーフィルタの中心をフォトダイオードの中心からずらし、受光素子列の中央領域や中間領域(中央領域と端部領域の間の領域)はずらさないようにしてもよい。
104 LED
1202 カラーフィルタ
1203 マイクロレンズ
1204 フォトダイオード
1205 ゲート電極
1207 配線
1406 縦配線
1407 横配線
Claims (24)
- 第1の方向に配置された複数の受光素子を備える受光素子列と、
前記複数の受光素子に対応して配置された複数の透過部と、
を備えるラインセンサであって、
複数の前記透過部は、第1の波長の光を透過する第1の透過部と、前記第1の波長とは異なる波長の光を透過する第2の透過部と、前記第1の波長及び前記第2の波長と異なる第3の波長の光を透過する第3の透過部と、を含み、
第1の方向に配置された複数の前記受光素子は、前記第1の透過部に対応する第1の受光素子と、前記受光素子列の中央側に前記第1の受光素子と隣接して設けられ前記第2の透過部に対応する第2の受光素子と、前記受光素子列の中央側に前記第2の受光素子と隣接して設けられ前記第3の透過部に対応する第3の受光素子と、を含み、
前記受光素子列は、前記第1の方向と直交する第2の方向に第1の受光素子列、第2の受光素子列、第3の受光素子列として3列並べて配置され、
前記第1の受光素子列、前記第2の受光素子列及び前記第3の受光素子列の前記第2の方向に並ぶ受光素子に対応する透過部は、前記第1の透過部、前記第2の透過部、前記第3の透過部のそれぞれが存在し、
前記第1の透過部の中心は、前記第1の受光素子の中心に対して前記受光素子列の中央の方向にずれており、
前記第2の透過部の中心は、前記第2の受光素子の中心に対して前記受光素子列の中央の方向にずれており、
前記第3の透過部の中心は、前記第3の受光素子の中心に対して前記受光素子列の中央の方向にずれていることを特徴とするラインセンサ。 - 前記第1の透過部、前記第2の透過部、前記第3の透過部は、それぞれ赤、緑、青のカラーフィルタであることを特徴とする請求項8に記載のラインセンサ。
- 前記第1の透過部、前記第2の透過部、前記第3の透過部は、前記第1の方向に周期的に配置されていることを特徴とする請求項1又は2に記載のラインセンサ。
- 前記第1の透過部の中心と前記第1の受光素子の中心とがずれている量は、
前記第2の透過部の中心と前記第2の受光素子の中心とがずれている量よりも大きく、
前記第2の透過部の中心と前記第2の受光素子の中心とがずれている量は、
前記第3の透過部の中心と前記第3の受光素子の中心とがずれている量よりも大きいことを特徴とする請求項1乃至3のいずれか1項に記載のラインセンサ。 - 前記第1の受光素子は、第1の位置に配置された前記第1の受光素子と、前記第1の位置よりも前記受光素子列の中央側の第2の位置に配置された前記第1の受光素子とを含み、
前記第1の位置おける前記第1の透過部の中心と当該第1の透過部に対応する前記第1の受光素子の中心とがずれている量は、
前記第2の位置における前記第1の透過部の中心と当該第1の透過部に対応する前記第1の受光素子の中心とがずれている量よりも大きいことを特徴とする請求項1乃至4のいずれか1項に記載のラインセンサ。 - 前記受光素子に蓄積された電荷を転送する電荷転送部を備え、
前記電荷転送部と前記受光素子は、前記第1の方向と直交する第2の方向で接続されていることを特徴とする請求項1乃至5のいずれか1項に記載のラインセンサ。 - 前記透過部に対し前記受光素子とは逆側に配置され、前記複数の受光素子に対応して配置された複数の集光部を備え、
複数の前記集光部は、前記第1の受光素子に対応して設けられる第1の集光部を含み、
前記第1の集光部の中心は、前記第1の受光素子の中心に対して前記受光素子列の中央の方向にずれていることを特徴とする請求項1乃至6のいずれか1項に記載のラインセンサ。 - 前記第1の集光部は、第1の位置に配置された前記第1の集光部と、前記第1の位置よりも前記受光素子列の中央側の第2の位置に配置された前記第1の集光部とを含み、
前記第1の位置おける前記第1の集光部の中心と当該第1の集光部に対応する前記第1の受光素子の中心とがずれている量は、
前記第2の位置における前記第1の集光部の中心と当該第1の集光部に対応する前記第1の受光素子の中心とがずれている量よりも大きいことを特徴とする請求項7に記載のラインセンサ。 - 複数の前記集光部は、第1の方向において隣接する集光部と間隔をあけて配置されていることを特徴とする請求項7又は8に記載のラインセンサ。
- 前記集光部は楕円形状のマイクロレンズであり、前記第1の方向の曲率半径に対して、前記第1の方向と直交する第2の方向の曲率半径の方が大きいことを特徴とする請求項7乃至9のいずれか1項に記載のラインセンサ。
- 前記第1の透過部の第2の方向における幅は、第1の透過部の第1の方向における幅よりも大きいことを特徴とする請求項1乃至10のいずれか1項に記載のラインセンサ。
- 前記第1の透過部、前記第2の透過部及び前記第3の透過部は、前記第2の方向に並んで配置された受光素子列の間の領域を覆うように設けられていることを特徴とする請求項1乃至11のいずれか1項に記載のラインセンサ。
- 前記第1の透過部と前記第1の受光素子との間に設けられた配線部を備え、前記配線部は、前記第1の透過部を通過した光が前記第1の受光素子に入射するように開口がもうけられていることを特徴とする請求項1乃至12のいずれか1項に記載のラインセンサ。
- 前記配線部は、第1の方向に延びる横配線と、第2の方向に延びる縦配線とを備えることを特徴とする請求項13に記載のラインセンサ。
- 第1の方向及び第2の方向と直交する第3の方向において、前記横配線は、前記縦配線よりも前記第1の透過部に近い側に配置されることを特徴とする請求項14に記載のラインセンサ。
- 第2の方向における前記開口の幅をW1、前記第1の受光素子の幅をW2として、W1>W2であることを特徴とする請求項13乃至15のいずれか1項に記載のラインセンサ。
- 第1の方向における前記開口の幅をW3、前記第1の受光素子の幅をW4として、W3<W4であることを特徴とする請求項13乃至16のいずれか1項に記載のラインセンサ。
- 前記第2の方向に複数の受光素子を備える第4の受光素子列をさらに設け、
前記第4の受光素子列は前記複数の受光素子に対応して配置された所定の波長の光を透過する第4の透過部を備え、
前記第4の透過部は第1の方向に連続して配置されることを特徴とする請求項1乃至17のいずれか1項に記載のラインセンサ。 - 前記第4の透過部は、前記第1の透過部と同じ波長の光を透過することを特徴とする請求項18に記載のラインセンサ。
- 対象物の画像を読み取る画像読取装置であって、
請求項18乃至19のいずれか1項に記載のラインセンサと、
モノクロ画像の読取りを行う場合に、前記第1の受光素子列、前記第2の受光素子列、前記第3の受光素子列を用いて画像を読取る第1のモードでの読み取り又は、前記第4の受光素子列を用いて画像を読取る第2のモードでの読み取りを実行する制御部を備えることを特徴とする画像読取装置。 - ユーザーが操作を行う操作部を備え、前記操作部により前記第1のモードでの読み取りを実行するか、前記第2のモードでの読み取りを実行するかを切り替えることが可能であることを特徴とする請求項20に記載の画像読取装置。
- 前記制御部は、カラー画像を読取る場合は第1のモードで読取りを行い、モノクロ画像を読取る場合は第2のモードで読取りを行うことを特徴とする請求項20又は21に記載の画像読取装置。
- 対象物の画像を読み取る画像読取装置であって、
前記対象物に光を照射する発光部と、
請求項1乃至22のいずれか1項に記載のラインセンサと、
シートから反射した光を前記ラインセンサに導く縮小光学系と、
を備えることを特徴とする画像読取装置。 - 請求項22又は23に記載の画像読取装置と、
前記画像読取装置により読み取られた画像を形成する画像形成部と、
を備えることを特徴とする画像形成装置。
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JP2020109997A (ja) | 2020-07-16 |
CN109819136A (zh) | 2019-05-28 |
US10412253B2 (en) | 2019-09-10 |
JPWO2016104366A1 (ja) | 2017-10-05 |
US10812673B2 (en) | 2020-10-20 |
US20180324317A1 (en) | 2018-11-08 |
WO2016103430A1 (ja) | 2016-06-30 |
US20170289386A1 (en) | 2017-10-05 |
KR20170098879A (ko) | 2017-08-30 |
US10063732B2 (en) | 2018-08-28 |
EP3240279B1 (en) | 2022-08-10 |
KR101940434B1 (ko) | 2019-01-18 |
US11363159B2 (en) | 2022-06-14 |
CN107113365B (zh) | 2019-03-08 |
JP6965388B2 (ja) | 2021-11-10 |
US20190342465A1 (en) | 2019-11-07 |
JP6676543B2 (ja) | 2020-04-08 |
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