WO2008004551A1 - dispositif d'imagerie à semi-conducteurs - Google Patents
dispositif d'imagerie à semi-conducteurs Download PDFInfo
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- WO2008004551A1 WO2008004551A1 PCT/JP2007/063306 JP2007063306W WO2008004551A1 WO 2008004551 A1 WO2008004551 A1 WO 2008004551A1 JP 2007063306 W JP2007063306 W JP 2007063306W WO 2008004551 A1 WO2008004551 A1 WO 2008004551A1
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- WO
- WIPO (PCT)
- Prior art keywords
- pixel
- output
- photodiodes
- solid
- switch
- Prior art date
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- 238000003384 imaging method Methods 0.000 title claims abstract description 73
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000010354 integration Effects 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001444 catalytic combustion detection Methods 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14643—Photodiode arrays; MOS imagers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/14603—Special geometry or disposition of pixel-elements, address-lines or gate-electrodes
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/30—Circuitry of solid-state image sensors [SSIS]; Control thereof for transforming X-rays into image signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/40—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled
- H04N25/46—Extracting pixel data from image sensors by controlling scanning circuits, e.g. by modifying the number of pixels sampled or to be sampled by combining or binning pixels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/50—Control of the SSIS exposure
- H04N25/57—Control of the dynamic range
- H04N25/58—Control of the dynamic range involving two or more exposures
- H04N25/581—Control of the dynamic range involving two or more exposures acquired simultaneously
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
- H04N25/77—Pixel circuitry, e.g. memories, A/D converters, pixel amplifiers, shared circuits or shared components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/14—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices
- H04N3/15—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices for picture signal generation
- H04N3/155—Control of the image-sensor operation, e.g. image processing within the image-sensor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
- H01L27/14601—Structural or functional details thereof
- H01L27/14609—Pixel-elements with integrated switching, control, storage or amplification elements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/30—Transforming light or analogous information into electric information
- H04N5/32—Transforming X-rays
Definitions
- the present invention relates to a solid-state imaging device including an imaging region in which a plurality of pixels each including a photodiode are two-dimensionally arranged.
- CMOS-X-ray flat panel sensor uses a CMOS solid-state imaging device with a plurality of pixel-powered imaging regions each including a photodiode, so that the imaging region has a two-dimensional area that is free from distortion at the periphery. (For example, about 12cm X 12cm) is easy. Unlike visible light, X-rays cannot be collected by a lens, so this solid-state imaging device has a large area when photographing a large area at once, such as when applied to dental use (especially dental 3D-CT). Imaging area is required.
- the solid-state imaging device for medical use requires, for example, a living body to be imaged, so that the required resolution is low, and it is necessary to increase the sensitivity while suppressing the amount of X-ray exposure as much as possible. . Therefore, compared to other general solid-state imaging devices for imaging, the solid-state imaging device for medical use has a photosensitive region (a region in which charge is generated according to light incidence) of each pixel included in the imaging region. ) Is about 10 to 100 times larger.
- the shape of the photosensitive region of each pixel has a side length of, for example, 150 m to 200 m. It must be m squares.
- the large photosensitive area of each pixel in this way means that the number of pixels included in the imaging area is small, which is advantageous in driving at a video rate of 30 frames Z seconds. .
- Patent Document 1 Japanese Patent Laid-Open No. 2005-333250
- the present invention has been made to solve the above problems, and an object of the present invention is to provide a solid-state imaging device that can perform imaging with a good SZN ratio and is suitable for dental use.
- a solid-state imaging device includes: (1) an imaging region in which a plurality of pixels each including a plurality of photodiodes are two-dimensionally arranged; and (2) a plurality of pixels included in each pixel of the imaging region.
- a signal readout unit that outputs a voltage corresponding to the amount of charge generated in each photodiode, and (3) the voltage output from the signal readout unit is input and AD converted, and the digital signal corresponding to the input voltage is output.
- An AD converter that outputs a value; (4) for each pixel in the imaging area, a digital value output from the AD converter according to the amount of charge generated by each of the plurality of photodiodes included in the pixel; And a summing unit that outputs a digital value that is the sum value.
- the photosensitive region of each of the plurality of photodiodes included in each pixel of the imaging region is characterized by a square as a whole.
- the photosensitive regions of the plurality of photodiodes included in each pixel of the imaging region have the same area. These areas may have an error within 5%.
- a plurality of pixels are two-dimensionally arranged in the imaging region.
- Each pixel includes a plurality of photodiodes.
- the charges generated in each of the plurality of photodiodes included in each pixel in the imaging region are input to the signal reading unit, and a voltage corresponding to the amount of the charges is output from the signal reading unit.
- the voltage output from the signal readout unit is input to the AD conversion unit, and a digital value corresponding to this input voltage is output from the AD conversion unit.
- the summation unit calculates the sum of the digital values output from the AD conversion unit for each pixel in the imaging region in accordance with the amount of charge generated by each of the plurality of photodiodes included in the pixel. A digital value that is a value is output.
- the solid-state imaging device according to the present invention can perform imaging with a good SZN ratio, and can be suitably used for dental applications.
- FIG. 1 is a configuration diagram of a solid-state imaging device 1 according to the present embodiment.
- FIG. 2 is a circuit diagram of each of the pixel P, the integrating circuit 21 and the holding m, n n, k holding circuit 22 of the solid-state imaging device 1 according to the present embodiment.
- FIG. 3 shows two photodies m, n included in the pixel P of the solid-state imaging device 1 according to the present embodiment.
- Fig. 3 (a) is a plan view showing the shape of the photosensitive region of each of Aether PD and PD.
- Fig. 3- (b) shows a rectangular photodiode pair adjacent in the vertical direction
- Fig. 3- (c) shows a triangular photodiode pair adjacent to each other
- Fig. 3- (d) Indicates a pair of trapezoidal photodiodes adjacent to each other.
- FIG. 4 is a timing chart for explaining the operation of the solid-state imaging device 1 according to the present embodiment.
- FIG. 4 (a) shows the timing of the switch SW of each integrating circuit 21, and FIG. ) Is n, k 21
- Fig. 4 (dl) shows the timing of the switch n, k 221 1, 1 SW SW of the holding circuit 22, and Fig. 4 (d2) shows the timing of the switch SW of the holding circuit 22.
- Fig. 4 (d3) shows the switch SW timing of holding circuit 22 and Fig. 4
- Fig. 4 (d6) shows switch S of holding circuit 22.
- Figure 4— (e) shows the output timing of the AD converter 40
- Figure 4— (f) shows the output timing of the adder 50.
- FIG. 1 is a configuration diagram of a solid-state imaging device 1 according to the present embodiment.
- the solid-state imaging device 1 shown in this figure includes an imaging region 10, a signal readout unit 20, a buffer circuit 30, an AD conversion unit 40, an addition unit 50, a row selection unit 60, and a column selection unit 70.
- the imaging region 10 is a two-dimensional array of M X N pixels P to P arranged in M rows and N columns.
- Pixel ⁇ is located in m-th row and ⁇ -th column. Where ⁇ and ⁇ are integers greater than or equal to 2, m, n
- M is an integer from 1 to M
- n is an integer from 1 to N.
- Each of the M X N pixels P to P has a common configuration, and two photodiodes PD and PD
- the switches SW and SW included in each pixel P are m-th row selection m, n 1 2 output from the row selection unit 60.
- the open / close operation is controlled by the selection signal VseKm).
- the anode terminal is grounded, the force sword terminal is connected to the wiring L via the switch SW, and when the switch SW is closed, an amount of charge corresponding to the amount of incident light is wired and output to the wiring .
- the photodiode PD included in each pixel P has anode n, l m, n 2 terminals grounded, and a force sword terminal connected to the wiring L via the switch SW.
- the signal readout unit 20 includes two photodiodes PD m, n included in each pixel P in the imaging region 10.
- PD outputs a voltage according to the amount of charge generated in each, 2N products
- Each of the paths 21 to 21 has a common configuration.
- Each integrating circuit 21 accumulates the charge input via the wiring L, and n, k n, k according to the accumulated charge amount.
- Each holding circuit 22 inputs the voltage output from the integrating circuit 21 and inputs n, k n, k
- the held voltage V is output n, k. Where k is 1 or 2.
- the signal processing unit 20 applies the voltages V, V, V, V
- V, V, ⁇ , ⁇ , V, ⁇ , ⁇ , V output to the river page.
- the AD conversion unit 40 inputs and converts the voltage V output from the signal processing unit 20 through the buffer circuit 30 to n, k, and outputs a digital value D corresponding to the input voltage V.
- the data output from the AD converter 40 according to the amount of charge generated in each of the PDs and PDs.
- the sum of the digital values D and D is calculated, and the digital value D (2D + D) ⁇ , ⁇ ⁇ , 2 ⁇ ⁇ , ⁇ ⁇ , 2 is output as the sum.
- the row selection unit 60 includes m, l m, N in each of ⁇ pixels ⁇ to P in the m-th row of the imaging region 10.
- the column selection unit 70 includes 2N holding circuits 22 to 22 included in the signal reading unit 20.
- the output of the holding voltage is controlled so that the voltage V, V, V, V
- FIG. 2 shows a pixel ⁇ , an integration circuit 21 and a holding circuit of the solid-state imaging device 1 according to this embodiment.
- Circuit 22 Each circuit diagram. In this figure, these are shown as representatives n, k
- n is an integer from 1 to N
- k is 1 or 2.
- Each integrating circuit 21 includes an amplifier A, a capacitor C, and a switch SW. Integral
- the input terminal of the amplifier A included in the circuit 21 is included in the pixel P via the wiring L. n, k 21 n, k m, n
- Capacitor C and switch SW are connected to amplifier A
- n, k closes the switch SW power, the capacitor C is discharged and the integration circuit 21 power is output.
- the integration circuit 21 operates when the switch SW is open.
- the pressure is output to the holding circuit 22.
- Each holding circuit 22 includes a capacitor C and switches SW and SW.
- One end of the sit C is connected to the output terminal of the amplifier A of the integrating circuit 21 via the switch SW.
- This holding circuit 22 has a switch SW
- the integration circuit 21 outputs at that time.
- the stored voltage V is held in capacitor C.
- the holding circuit 22 has a switch SW
- FIG. 3 shows two photodiodes included in the pixel P of the solid-state imaging device 1 according to this embodiment.
- FIG. 6 is a plan view showing the shape of the photosensitive region of each of the PDs PD and PD. Shown in the figure
- mn 1 2 The area is generally square. Two adjacent sides of the square may have an error of 5% or less. Also, m, n 1 2 of each of the two photodiodes PD, PD included in each pixel P
- the photosensitive regions preferably have the same area. These areas may have an error within 5%.
- the photosensitive areas of PD and PD are rectangular as shown in Fig. 3- (a) and Fig. 3- (b).
- the solid-state imaging device 1 operates under control by a row selection unit 60, a column selection unit 70, and a control unit that controls the operation of the entire solid-state imaging device 1.
- FIG. 4 is a timing chart for explaining the operation of the solid-state imaging device 1 according to this embodiment.
- Fig. 4- (a) shows the switch SW timing of each integration circuit 21, and Fig. 4- (b) shows the m n, k 21
- Fig. 4 (c) shows each holding circuit 2 m, n 1 2
- Fig. 4 (dl) shows the switch SW n, k 221 1, 1 of the holding circuit 22.
- Figure 4 (d2) shows the timing of the switch SW of the holding circuit 22.
- Figure 4 (d3) shows the switch SW timing of holding circuit 22 and Figure 4 (d4)
- Fig. 4 (d6) shows the switch SW of holding circuit 22.
- FIG. 4 (e) shows the output timing of the AD converter 40
- FIG. 4 (f) shows the output timing of the adder 50.
- this figure shows (a) the opening / closing operation of the switch SW of each integrating circuit 21 and (b) the m n, k 21
- the switch SW is closed for a certain period, which causes the capacitor C to be discharged and the output voltage
- the selection signal Vsel (m) becomes high level for a certain period and the switches SW and SW are periodically
- the charge accumulated in the junction capacitor in response to the incident light passes through the switches SW and SW.
- the switch SW is closed for a certain period, and this switch SW is opened from the closed state.
- the signals V, V, V, V, V, V,..., V, V, V,..., V, V are output from the signal processing unit 20 to the buffer circuit 30.
- the AD conversion unit 40 the voltage V output from the signal processing unit 20 and passed through the buffer circuit 30 is AD converted, and the digital value D corresponding to the input voltage V is added to the addition unit 50.
- D, D, D, ..., D, D, ..., D, D are output in this order.
- the digital value D is the photodiode PD of the pixel P located in the m-th row and the n-th column.
- I is a value according to the amount of incident light m k, n k entering the photodiode PD of the pixel P.
- D is the two photodiodes included in the pixel P.
- N pixels P in the next (m + 1) -th row are subsequently obtained.
- each pixel ⁇ in the imaging region 10 includes two photodiodes PD and PD, and is generated by the photodiodes PD and PD. Voltages V and V and digital values D and D according to the amount of charge are obtained, and
- each pixel includes one photodiode and the junction capacitance value of the photodiode is C.
- the magnitude of the noise component included in the digital value output from the AD converter is expressed as “AX C”.
- A is a constant determined by the amplifier included in the integration circuit.
- each pixel includes two photodiodes and the area of the entire photosensitive region of each pixel is the same as that in the comparative example, the individual photodiodes The junction capacitance value is CZ2. Therefore, the magnitude of the noise component included in the digital value D output from the AD converter 40 is expressed as “AX CZ2”, and the size of the noise component included in the digital value D output from the adder 50 is “ AX C / 2 5 ". Thus, in the present embodiment, the magnitude of the noise component included in the digital value D corresponding to the amount of light incident on each pixel P is lZ2 5 times that of the comparative example.
- the upper limit of the dynamic range of light detection is the lower of the upper limit of the amount of charge that can be accumulated in the junction capacitance portion of the photodiode and the saturation level of the output voltage of the integration circuit that reads the charge. It depends on. As in the case of dental applications, if the area of the photosensitive region of the photodiode is large, the amount of charge that can be stored in the junction capacitance of the photodiode is also large, so the dynamic range is limited by saturation of the output voltage of the integration circuit. It is. In addition, with the recent decrease in power supply voltage for reducing power consumption, the drive voltage of the amplifier tends to decrease, and therefore, the saturation voltage level of the amplifier tends to decrease further. In this case, even if a large amount of charge can be accumulated in the junction capacitance portion of the photodiode, the charge exceeding the saturation of the amplifier included in the integrating circuit is wasted.
- the amount of charge accumulated in each integration circuit is halved as compared with the above comparative example, so that the signal amount is doubled for each pixel.
- the noise component is 1 ⁇ 2 ⁇ 5 times, so the SZN ratio at the upper limit of the dynamic range is 22 times.
- the present invention is not limited to the above embodiment, and various modifications are possible.
- the number of photodiodes included in each pixel is two in the above embodiment, but may be three or more.
- the present invention relates to a general medical X-ray solid-state imaging device in terms of irradiating a human body with X-rays, not limited to dental treatment.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Solid State Image Pick-Up Elements (AREA)
- Apparatus For Radiation Diagnosis (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07768080A EP2037674B1 (en) | 2006-07-04 | 2007-07-03 | Solid-state imaging device |
US12/307,173 US8482644B2 (en) | 2006-07-04 | 2007-07-03 | Solid-state imaging device |
CN2007800253982A CN101485195B (zh) | 2006-07-04 | 2007-07-03 | 固体拍摄装置 |
KR1020087027608A KR101407807B1 (ko) | 2006-07-04 | 2007-07-03 | 고체 촬상 장치 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006184514A JP4808557B2 (ja) | 2006-07-04 | 2006-07-04 | 固体撮像装置 |
JP2006-184514 | 2006-07-04 |
Publications (1)
Publication Number | Publication Date |
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WO2008004551A1 true WO2008004551A1 (fr) | 2008-01-10 |
Family
ID=38894519
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/063306 WO2008004551A1 (fr) | 2006-07-04 | 2007-07-03 | dispositif d'imagerie à semi-conducteurs |
Country Status (7)
Country | Link |
---|---|
US (1) | US8482644B2 (ja) |
EP (1) | EP2037674B1 (ja) |
JP (1) | JP4808557B2 (ja) |
KR (1) | KR101407807B1 (ja) |
CN (1) | CN101485195B (ja) |
TW (1) | TWI424741B (ja) |
WO (1) | WO2008004551A1 (ja) |
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JP5091695B2 (ja) * | 2008-01-24 | 2012-12-05 | 浜松ホトニクス株式会社 | 固体撮像装置 |
US7495228B1 (en) * | 2008-03-31 | 2009-02-24 | General Electric Company | Dual function detector device |
JP5058057B2 (ja) * | 2008-04-24 | 2012-10-24 | 浜松ホトニクス株式会社 | 医療用x線撮像システム |
JP5101402B2 (ja) * | 2008-06-18 | 2012-12-19 | 浜松ホトニクス株式会社 | 固体撮像装置 |
JP5155759B2 (ja) * | 2008-07-17 | 2013-03-06 | 浜松ホトニクス株式会社 | 固体撮像装置 |
JPWO2010090166A1 (ja) * | 2009-02-04 | 2012-08-09 | 株式会社 Rosnes | 固体撮像装置 |
JP5526342B2 (ja) | 2009-02-04 | 2014-06-18 | 株式会社 Rosnes | 固体撮像装置 |
JP2011242261A (ja) * | 2010-05-18 | 2011-12-01 | Fujifilm Corp | 放射線検出器 |
JP5582945B2 (ja) * | 2010-09-28 | 2014-09-03 | キヤノン株式会社 | 撮像システム |
JP6149369B2 (ja) * | 2012-09-27 | 2017-06-21 | 株式会社ニコン | 撮像素子 |
EP2738812B8 (en) | 2012-11-29 | 2018-07-18 | ams Sensors Belgium BVBA | A pixel array |
CN105684436B (zh) * | 2013-09-26 | 2020-05-01 | 株式会社尼康 | 摄像元件以及摄像装置 |
JP6530593B2 (ja) * | 2014-08-11 | 2019-06-12 | キヤノン株式会社 | 撮像装置及びその制御方法、記憶媒体 |
JP6218799B2 (ja) * | 2015-01-05 | 2017-10-25 | キヤノン株式会社 | 撮像素子及び撮像装置 |
JP6527035B2 (ja) * | 2015-06-30 | 2019-06-05 | 浜松ホトニクス株式会社 | 固体撮像装置 |
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CN101485195B (zh) | 2011-10-19 |
JP4808557B2 (ja) | 2011-11-02 |
EP2037674A1 (en) | 2009-03-18 |
KR101407807B1 (ko) | 2014-06-17 |
TW200818890A (en) | 2008-04-16 |
KR20090026133A (ko) | 2009-03-11 |
EP2037674A4 (en) | 2009-10-28 |
CN101485195A (zh) | 2009-07-15 |
JP2008017019A (ja) | 2008-01-24 |
TWI424741B (zh) | 2014-01-21 |
US20090295954A1 (en) | 2009-12-03 |
EP2037674B1 (en) | 2011-10-26 |
US8482644B2 (en) | 2013-07-09 |
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