WO2013065668A1 - 受発光一体型素子を用いた受発光装置およびセンサ装置 - Google Patents
受発光一体型素子を用いた受発光装置およびセンサ装置 Download PDFInfo
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- WO2013065668A1 WO2013065668A1 PCT/JP2012/077984 JP2012077984W WO2013065668A1 WO 2013065668 A1 WO2013065668 A1 WO 2013065668A1 JP 2012077984 W JP2012077984 W JP 2012077984W WO 2013065668 A1 WO2013065668 A1 WO 2013065668A1
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- Prior art keywords
- light receiving
- semiconductor layer
- light emitting
- light
- substrate
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- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 3
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/02016—Circuit arrangements of general character for the devices
- H01L31/02019—Circuit arrangements of general character for the devices for devices characterised by at least one potential jump barrier or surface barrier
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/12—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
- H01L31/16—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources
- H01L31/167—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers
- H01L31/173—Semiconductor devices 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; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto the semiconductor device sensitive to radiation being controlled by the light source or sources the light sources and the devices sensitive to radiation all being semiconductor devices characterised by potential barriers formed in, or on, a common substrate
Definitions
- the present invention relates to a light receiving / emitting device and a sensor device including a light receiving / emitting integrated element in which a light emitting element and a light receiving element are integrally formed on the same substrate.
- This sensor device detects the characteristics of an irradiated object by irradiating the irradiated object with light from the light emitting element and receiving the regular reflected light and diffuse reflected light with respect to the light incident on the irradiated object by the light receiving element.
- This sensor device is used in a wide range of fields, such as photo interrupters, photocouplers, remote control units, IrDA (Infrared Data Association) communication devices, optical fiber communication devices, and document size sensors. It has been.
- the light receiving element when the light receiving element receives regular reflection light of light irradiated on the object from the light emitting element, the light receiving element can receive more accurate regular reflection light. It is preferable that the light receiving element is disposed closer to the light receiving element.
- one surface of a semiconductor substrate made of silicon is doped with an impurity, and a shallow pn junction region having a light receiving function and a deep pn junction region having a light emitting function are adjacent to each other.
- the formed light emitting / receiving element array is described.
- the conventional light emitting and receiving element array has a problem that the detection accuracy cannot be made relatively high.
- the present invention has been made in view of the above problems, and is a light receiving / emitting device using a light receiving / emitting integrated element in which a light receiving element and a light emitting element are integrally formed on the same silicon substrate in close proximity. Even if it exists, it aims at providing the light receiving and emitting apparatus which comparatively suppresses that the leakage current which generate
- a light emitting / receiving device is a light emitting / receiving device using a light receiving / emitting integrated element in which a light receiving element and a light emitting element are provided on one main surface of the substrate, and the substrate has one conductive property.
- At least one electrode layer is disposed in a region corresponding to at least the light receiving element and the light emitting element on the other main surface of the substrate, and the light receiving element is formed on one main surface side of the substrate
- a first other conductivity type semiconductor layer a first anode electrode formed on an upper surface of the first other conductivity type semiconductor layer; a first cathode electrode formed on an upper surface of one main surface of the substrate;
- An operational amplifier in which an inverting input terminal is connected to the first anode electrode, and a non-inverting input terminal is connected to the first cathode electrode and the electrode layer, and the electrode layer, the first 1 anode electrode Fine said first cathode electrode, characterized in that it is the same potential.
- FIG. 1 is a schematic view of a light receiving and emitting device according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a light receiving / emitting integrated element constituting the light emitting / receiving device shown in FIG. 1.
- FIG. 2 is a schematic connection diagram between a light receiving element and an operational amplifier constituting the light emitting / receiving device shown in FIG. It is a figure explaining the usage method in the case of using the light emitting / receiving device shown in FIG. 1 as a sensor apparatus. It is the schematic which shows the 1st modification of the light emitting / receiving apparatus shown in FIG. FIG.
- FIG. 6 is a schematic connection diagram of a light receiving element, an operational amplifier, and a power source that constitute a first modification of the light emitting and receiving device shown in FIG. 5. It is sectional drawing of the light emitting / receiving integrated element which comprises the 2nd modification of the light emitting / receiving apparatus shown in FIG. It is a figure for demonstrating the area
- an electrophotographic apparatus such as a page printer, and functions as a sensor apparatus.
- the light emitting / receiving device 1 includes a light receiving / emitting integrated element 3 and an operational amplifier 4 on the upper surface of the base substrate 2.
- the light receiving / emitting integrated element 3 and the operational amplifier 4 are mounted on the upper surface of the base substrate 2 via a thermosetting adhesive such as epoxy resin.
- the base substrate 2 is provided as a support for supporting the light receiving / emitting integrated element 3 and the operational amplifier 4, the electrical connection between the light receiving / emitting integrated element 3 and the operational amplifier 4, and the outside of the light receiving / emitting integrated element 3. It functions as a circuit board that performs electrical connection with a power source.
- the base substrate 2 has a rectangular shape, but is not limited to such a shape.
- the light receiving and emitting integrated element 3 includes a substrate 10, a light receiving element 20 provided on the upper surface of the substrate 10, a light emitting element 30, and an electrode layer 5 provided on the lower surface of the substrate 10. .
- the substrate 10 is formed of, for example, a single crystal such as silicon (Si), gallium arsenide (GaAs), gallium phosphide (GaP), and gallium nitride (GaN).
- the substrate 10 is an n-type semiconductor substrate or a p-type semiconductor substrate by being doped with an n-type impurity or a p-type impurity.
- the n-type impurity include silicon (Si), selenium (Se), and phosphorus (P), and the concentration thereof is set to 1 ⁇ 10 16 to 1 ⁇ 10 20 atoms / cm 3 .
- Examples of the p-type impurity include zinc (Zn), magnesium (Mg), carbon (C), and boron (B), and the concentration thereof is set to 1 ⁇ 10 16 to 1 ⁇ 10 20 atoms / cm 3. ing.
- the substrate 10 in this example an n-type semiconductor substrate in which phosphorus (P) is doped in silicon (Si) at a concentration of 1 ⁇ 10 15 atoms / cm 3 is used.
- the light receiving element 20 includes a semiconductor layer 21 doped with p-type impurities or n-type impurities on the upper surface side of the base substrate 10, a first anode electrode 22 disposed on the upper surface of the semiconductor layer, and the semiconductor layer 21. And a first cathode electrode 23 disposed on the upper surface of the substrate 10 in proximity.
- the light receiving element 20 has a pn junction formed by forming a semiconductor layer 21 doped with p-type impurities or n-type impurities on the upper surface side of the base substrate 10. That is, when the base substrate 10 is an n-type semiconductor, a p-type impurity is doped, and when the base substrate 10 is a p-type semiconductor, a pn junction is formed by doping the n-type impurity. When light is incident on the pn junction, electrons and holes are generated and a photocurrent is generated.
- the semiconductor layer 21 includes, for example, atoms such as zinc (Zn), magnesium (Mg), carbon (C), boron (B), aluminum (Al) and gallium (Ga) as p-type impurities and antimony as n-type impurities. (Sb), phosphorus (P), arsenic (As), silicon (Si), selenium (Se), and other atoms at a concentration of 1 ⁇ 10 16 to 1 ⁇ 10 20 atoms / cm 3 are 0.5 to 3 ⁇ m. It is formed by doping so as to have a thickness of.
- the semiconductor layer 21 of this embodiment is a p-type semiconductor layer in which boron (B) is doped with silicon (Si) at 1 ⁇ 10 18 atoms / cm 3 .
- the first anode electrode 22 is disposed on the upper surface of the semiconductor layer 21.
- the first anode electrode 22 is made of, for example, an alloy of gold (Au) and chromium (Cr), an alloy of aluminum (Al) and chromium (Cr), an alloy of platinum (Pt) and titanium (Ti), or the like.
- the thickness thereof is 0.5 to 5 ⁇ m.
- the first cathode electrode 23 is disposed on the upper surface of the base substrate 10 in the vicinity of the semiconductor layer 21.
- the first cathode electrode is formed of, for example, an alloy of gold (Au) and antimony (Sb) and has a thickness of 0.5 to 5 ⁇ m.
- the light emitting element 30 is formed on the upper surface of the intrinsic semiconductor layer 31a formed on the upper surface of the base substrate 10, the n-type semiconductor layer 31b formed on the upper surface of the intrinsic semiconductor layer 31a, and the n-type semiconductor layer 31b.
- a p-type semiconductor layer 31c and a second cathode electrode 33, and a second anode electrode 32 formed on the upper surface of the p-type semiconductor layer 31c are provided.
- a semiconductor pn junction is formed by the n-type semiconductor layer 31b and the p-type semiconductor layer 31c.
- a current is supplied to the pn junction, and the light-emitting element 30 emits light by recombining electrons and holes.
- the intrinsic semiconductor layer 31a is made of gallium arsenide (GaAs), indium gallium arsenide (InGaAs), aluminum gallium arsenide (AlGaAs), gallium indium phosphide (GaInP), aluminum gallium indium phosphide (AlGaInP), and gallium nitride (Non-doped impurities). (GaN) and the like, and the thickness is 0.1 to 2 ⁇ m.
- the intrinsic semiconductor layer 31a of this embodiment is indium gallium arsenide (InGaAs).
- the intrinsic semiconductor layer 31a of this embodiment is not intentionally doped with impurities, but Si or the like is mixed as an inevitable impurity at a concentration of 1 ⁇ 10 14 atoms / cm 3 in the semiconductor manufacturing process or the like. There is.
- a buffer layer is provided on the upper surface of the base substrate 10, and the intrinsic semiconductor layer 31a is formed on the upper surface of the buffer layer.
- the buffer layer is formed of a single crystal such as gallium arsenide (GaAs) and has a thickness of 0.1 to 1 ⁇ m.
- the n-type semiconductor layer 31b includes, for example, gallium arsenide (GaAs) doped with atoms such as sulfur (S), silicon (Si), selenium (Se), tin (Sn), and phosphorus (P) as n-type impurities, aluminum It is formed of a single crystal such as gallium arsenide (AlGaAs), gallium indium phosphide (GaInP), aluminum gallium indium phosphide (AlGaInP), and gallium nitride (GaN), and the thickness is 1 to 4 ⁇ m.
- the concentration of the n-type impurity is, for example, 1 ⁇ 10 16 to 1 ⁇ 10 20 atoms / cm 3 .
- gallium arsenide (GaAs) is doped with silicon (Si) at a concentration of about 1 ⁇ 10 18 atoms / cm 3 .
- the second cathode electrode 33 formed on the upper surface of the n-type semiconductor layer 31b is, for example, an alloy of gold (Au) and antimony (Sb), an alloy of gold (Au), germanium (Ge), or a nickel-based alloy. Etc., and has a thickness of 0.5 to 5 ⁇ m.
- the p-type semiconductor layer 31c includes, for example, gallium arsenide (GaAs) doped with atoms such as zinc (Zn), magnesium (Mg), and carbon (C) as p-type impurities, aluminum gallium arsenide (AlGaAs), gallium indium phosphide ( It is formed of a single crystal such as GaInP), aluminum gallium indium phosphide (AlGaInP), and gallium nitride (GaN), and has a thickness of 1 to 4 ⁇ m.
- the concentration of the p-type impurity is, for example, 1 ⁇ 10 16 to 1 ⁇ 10 20 atoms / cm 3 .
- gallium arsenide (GaAs) is doped with zinc (Zn) at a concentration of 1 ⁇ 10 18 atoms / cm 3 .
- the second anode electrode 32 formed on the upper surface of the p-type semiconductor layer 31c includes an alloy of gold (Au) and nickel (Ni), an alloy of gold (Au) and chromium (Cr), and gold (Au). It is made of an alloy of titanium (Ti) and aluminum (Al) and chromium (Cr), and has a thickness of 0.5 to 5 ⁇ m.
- the second anode electrode 32 and the second cathode electrode 33 of the light emitting element 30 are connected to an external power source (not shown) via a wire such as gold (Au) and aluminum (Al), and the second anode electrode
- a wire such as gold (Au) and aluminum (Al)
- the connection between the second anode electrode 32 and the second cathode electrode 33 and the external power source is not limited to the connection via a wire, and may be a conventionally known flip-chip connection or a connection using a conductive paste. There is no particular limitation.
- the electrode layer 5 is made of a conductive material such as gold (Au) and aluminum (Al) and has a thickness of 0.2 to 3 ⁇ m. At least one electrode layer 5 is formed in a region corresponding to the light receiving element 20 and the light emitting element 30 at least on the lower surface of the substrate 10.
- the corresponding region here is a region corresponding to the semiconductor layer 21 shown in FIG. 2A, a region corresponding to the first cathode electrode 23, and a region between these regions.
- the light emitting element 30 it is a region corresponding to the intrinsic semiconductor layer 31a shown in FIG.
- the intrinsic semiconductor layer is the same as in the case of the light receiving element 20 described above.
- the electrode layer 5 of this embodiment is formed of gold (Au) so as to cover the entire lower surface of the substrate 10 and has a thickness of 1 ⁇ m.
- the light receiving / emitting integrated element 3 described above is formed by a semiconductor manufacturing method such as a conventionally known thermal oxidation method, sputtering method, plasma CVD method, photolithography method, etching method, resistance heating vapor deposition method or the like.
- a semiconductor manufacturing method such as a conventionally known thermal oxidation method, sputtering method, plasma CVD method, photolithography method, etching method, resistance heating vapor deposition method or the like.
- the description of the insulating layers formed on the various semiconductor layers constituting the light receiving element 20 and the light emitting element 30 is omitted, but it goes without saying that the insulating layers are formed as necessary.
- the operational amplifier 4 includes an inverting input terminal 40a, a non-inverting input terminal 40b, and an output terminal 40c, and outputs a voltage proportional to a potential difference generated between the inverting input terminal 40a and the non-inverting input terminal 40b. Function as.
- the inverting input terminal 40 a is the first cathode electrode 23 of the light receiving element 20 and the electrode layer 5 of the base 10, and the non-inverting input terminal 40 b is the first of the light receiving element 20.
- the first anode electrode 22, the first cathode electrode 23, and the electrode layer 5 are at the same potential. That is, the first anode electrode 22 of the light receiving element 20 connected to the inverting input terminal 40a of the operational amplifier 4 and the first cathode electrode and electrode layer 5 connected to the non-inverting input terminal 40b are so-called imaginary shorts. (Also called virtual short).
- the light emitting / receiving element 20 of the present embodiment is driven in the zero bias mode.
- the operational amplifier 4 has a feedback resistor connected between the inverting input terminal 40a and the output terminal 40c and a power source for driving the operational amplifier 4. Yes.
- a feedback resistor of 1K to 10 M ⁇ is employed.
- leakage current so-called noise current
- the light receiving element 20 is connected to the light receiving element 20 through the substrate 10. Inflow can be relatively suppressed.
- the mechanism is that a leakage current is generated when the light emitting element 30 is driven.
- the n-type semiconductor to which the second cathode electrode 33 of the light emitting element 30 is connected is connected.
- the junction interface between the layer 31b and the intrinsic semiconductor layer 31a, the junction interface between the intrinsic semiconductor layer 31a and the substrate 10, and the intrinsic semiconductor 31a existing therebetween form a capacitor, and a carrier that becomes a source of leakage current by capacitive coupling. (Electrons or vacancies) are generated immediately below the bonding interface between the intrinsic semiconductor layer 31 a and the substrate 10. These carriers diffuse inside the substrate 10 to generate leakage current (so-called noise current).
- an error component (noise) is added to the output current from the light receiving element 20 (current output according to the received light intensity extracted from the first anode electrode 22).
- the generated carrier is discharged from the substrate 10 to the outside.
- the area and thickness of the first cathode electrode 23 of the light receiving element 20 are Therefore, not all leakage currents are discharged from the substrate 10 to the outside. Therefore, by forming the electrode layer 5 having a relatively large area in the corresponding area of the light receiving element 20 and the light emitting element 30 at least on the lower surface of the base 10 and setting it to the ground potential, the generated carrier is transferred from the base 10 to the electrode. It becomes possible to quickly discharge to the outside through the layer 5. Therefore, the leakage current generated by capacitive coupling when the light emitting element 30 is driven is relatively suppressed from flowing to the light receiving element 20 and is discharged to the outside through the electrode layer 5.
- the sensor device of the present embodiment is arranged so that the surface on which the light receiving element 20 and the light emitting element 30 of the light receiving and emitting device 1 are formed faces the intermediate transfer belt V. Then, light is emitted from the light emitting element 30 to the toner T on the intermediate transfer belt V.
- the prism P2 is disposed above the light receiving element 20 and the prism P1 is disposed above the light emitting element 30, and the light emitted directly above the pn junction region of the light emitting element 30 is refracted by the prism P1 to be intermediate. The light enters the toner on the transfer belt V.
- the regular reflection light L2 with respect to the incident light L1 is refracted by the prism P2 and received by the light receiving element 20.
- a photocurrent is generated in the light receiving element 20 in accordance with the intensity of the received light, and this photocurrent is detected by an external drive circuit via the first anode electrode 22.
- the photocurrent corresponding to the intensity of the regular reflection light from the toner T can be detected as described above. Since the intensity of the specularly reflected light also corresponds to the density of the toner T, the density of the toner T can be detected according to the magnitude of the generated photocurrent.
- the toner T density is constant, it can be detected as information on the distance from the sensor device of the intermediate transfer belt.
- the light emitting / receiving device of the present invention is not limited thereto, and various modifications can be made without departing from the spirit of the invention.
- the first anode electrode 22, the first cathode electrode, and the electrode layer 5 included in the light receiving element 20 are set to the same potential, but the second cathode electrode 33 included in the light emitting element 30 is also included.
- the same potential may be used.
- the light emitting and receiving device 1 of the present embodiment may further include a power source 6.
- the first anode electrode 22, the first cathode electrode 23, and the electrode layer 5 of the light receiving element 20 are set to the ground potential. The same potential can be obtained.
- the power source for driving the operational amplifier 4 can be a single power source, and the light emitting and receiving device can be downsized.
- the power source for driving the operational amplifier 4 is a positive power source and a negative power source.
- the power source to be used may be a single power source with only a positive power source. This is because in the former case, when the bright current and dark current that flow when light is incident on the light receiving element 20 and when it is not incident are converted into voltages, respectively, a negative potential and a ground potential are obtained. A power supply is required. On the other hand, in the latter case, since both the bright current and the dark current are converted into voltages, both can be set to a positive potential, so that the power source can be a single power source with only a positive power source. is there.
- the power supply 6 has a first power supply terminal 61 and a second power supply terminal 62, and the first power supply terminal 61 is connected to the first cathode electrode 23 and the electrode layer 5.
- the second power supply terminal 62 is at a ground potential.
- a groove 70 positioned between the light receiving element 20 and the light emitting element 30 of the light receiving and emitting integrated element 3 may be provided as in the second modification shown in FIG. Both ends of the groove 70 are located outside the region sandwiched between the light receiving element 20 and the light emitting element 30.
- a region sandwiched between the light receiving element 20 and the light emitting element 30 will be described with reference to FIGS. From the line segment connecting the center of the light receiving element 20 and the center of the light emitting element 30, one end and the other end having the longest perpendicular distance are obtained on both sides of the line segment.
- the light receiving element 20 and the light emitting element 30 receive light in a region (hatched portion) surrounded by a straight line that connects one end and the other end of the light emitting element 30 with the shortest distance and an outer edge along one end from the other end of the light receiving element 20 and the light emitting element 30. It is defined as a region sandwiched between the element 20 and the light emitting element 30.
- the groove 70 is formed by cutting the substrate 10 with a diamond blade or the like. Even if the leakage current generated by driving the light emitting element 30 described above is caused to flow from the light emitting element 30 side to the light receiving element 20 side by the groove 70, the groove 70 and the electrode layer 5 are avoided. Since the physical distance over which the leakage current moves becomes longer, the light receiving element 20 is relatively less affected. Alternatively, when an attempt is made to flow between the groove 70 and the electrode layer 5, a current flows to the outside through the electrode layer 5 disposed nearby, thereby comparing the influence of the leakage current on the light receiving element 20. Can be made smaller.
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Abstract
Description
以下、本発明の受発光装置について、図面を参照しつつ説明する。以下の例は本発明の実施の形態を例示するものであって、本発明はこれらの実施の形態に限定されるものではない。
次に、本実施形態の受発光装置をセンサ装置として使用する場合の使用方法について説明する。なお、以下では、このセンサ装置をコピー機やプリンタなどの電子写真装置における中間転写ベルトV上に付着したトナーT(被照射物)の濃度を検出するセンサ装置に適用する場合を例に挙げて説明する。
2 ベース基板
3 受発光一体型素子
4 演算増幅器
5 電極層
6 電源
10 ベース基板
20 受光素子
21 半導体層
22 第1のアノード電極
23 第1のカソード電極
30 発光素子
31a 真性半導体層
31b n型半導体層
31c p型半導体層
32 第2のアノード電極
33 第2のカソード電極
40a 反転入力端子
40b 非反転入力端子
40c 出力端子
61 第1の電源端子
62 第2の電源端子
70 溝
Claims (7)
- 受光素子と発光素子とが基板の一方主面に設けられている受発光一体型素子を用いた受発光装置であって、
前記基板は一導電型半導体からなり、
前記基板における他方主面の少なくとも前記受光素子および前記発光素子に対応する領域に少なくとも1つの電極層が配置され、
前記受光素子は、前記基板の一方主面側に形成された第1の他導電型半導体層と、該第1の他導電型半導体層の上面に形成された第1のアノード電極と、前記基板の一方主面の上面に形成された第1のカソード電極とを有し、
反転入力端子が前記第1のアノード電極に接続され、非反転入力端子が前記第1のカソード電極および前記電極層に接続されている演算増幅器をさらに備え、
前記電極層、前記第1のアノード電極および前記第1のカソード電極が同電位とされていることを特徴とする受発光装置。 - 前記発光素子は、前記基板の一方主面の上に真性半導体層および該真性半導体層の上方に少なくとも第2の一導電型半導体層ならびに第2の他導電型半導体層を含む半導体層を有し、
前記第2の他導電型半導体層は、前記第2の一導電型半導体層の上面の一部が露出するように該第2の一導電型半導体層よりも小さく形成されており、
前記第2の一導電型半導体層の上面に形成された第2のカソード電極と、前記第2の他導電型半導体層の上面に形成された第2のアノード電極とを有し、
前記非反転入力端子が前記第2のカソード電極にも接続されており、
前記電極層、前記第1のアノード電極、前記第1のカソード電極および前記第2のカソード電極が同電位とされていることを特徴とする請求項1に記載の受発光装置。 - 前記同電位が接地電位であることを特徴とする請求項1または2に記載の受発光装置。
- 前記同電位が正電位であることを特徴とする請求項1または2に記載の受発光装置。
- 第1の電源端子が前記第1のカソード電極および前記電極層に接続され、第2の電源端子が接地電位とされている電源をさらに備えていることを特徴とする請求項4に記載の受発光装置。
- 前記基板の一方主面に前記受光素子と前記発光素子との間に位置する溝を有し、
該溝の両端は、前記受光素子と前記発光素子とで挟まれた領域の外側に位置していることを特徴とする請求項1乃至5のいずれか1項に記載の受発光装置。 - 請求項1乃至6のいずれか1項に記載の受発光装置を用いたセンサ装置であって、
前記発光素子から被照射物に向けて光を照射し、前記被照射物からの反射光に応じて出力される前記受光素子からの出力電流に応じて前記被照射物の距離情報および濃度情報のうち少なくとも1つを検出することを特徴とするセンサ装置。
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CN201280052356.9A CN103890973B (zh) | 2011-10-31 | 2012-10-30 | 利用了受光发光一体型元件的受光发光装置及传感器装置 |
US14/354,885 US9478691B2 (en) | 2011-10-31 | 2012-10-30 | Light-receiving and emitting device including integrated light-receiving and emitting element and sensor |
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