JP2007232511A - Photodetector - Google Patents

Photodetector Download PDF

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JP2007232511A
JP2007232511A JP2006053212A JP2006053212A JP2007232511A JP 2007232511 A JP2007232511 A JP 2007232511A JP 2006053212 A JP2006053212 A JP 2006053212A JP 2006053212 A JP2006053212 A JP 2006053212A JP 2007232511 A JP2007232511 A JP 2007232511A
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light
photodetection
circuit
external light
infrared
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JP4826284B2 (en
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Keisuke Yamasato
啓介 山里
Masaki Kasahara
正樹 笠原
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Mitsumi Electric Co Ltd
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Mitsumi Electric Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a photodetector that detects light of a desired component from external light and can certainly block unwanted light. <P>SOLUTION: The photodetector for detecting the external light comprises a first photodetection section 121 for outputting a detection signal according to the light obtained by removing unwanted light from the external light, and a second photodetection section 122 that detects the external light and subtracts a detection signal according to the external light from the detection signal of the first photodetection section 121. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は光検出装置に係り、特に、外光から所望の成分の光を検出する光検出装置に関する。   The present invention relates to a light detection device, and more particularly to a light detection device that detects light of a desired component from external light.

ＬＣＤ、ＣＲＴなどでは、周囲環境に応じて表示品質が劣化しないように、周囲の照度を検出して、明るさを調整している（特許文献１参照）。このとき、周囲の照度は、照度センサによって検出されている。   In LCDs, CRTs, and the like, brightness is adjusted by detecting ambient illuminance so that display quality does not deteriorate according to the surrounding environment (see Patent Document 1). At this time, ambient illuminance is detected by an illuminance sensor.

照度センサは種々の波長が含まれる光を受光して、そのうち視感度の照度に対応した電流を出力するものである。このとき、入射光には、赤外光が含まれており、赤外光を検出した場合には、正しい輝度調整が行えない。   The illuminance sensor receives light including various wavelengths, and outputs a current corresponding to the illuminance of visibility. At this time, the incident light includes infrared light, and when the infrared light is detected, correct brightness adjustment cannot be performed.

一方、ＬＣＤ、ＣＲＴなどを用いたテレビジョン受像機は赤外線リモコンからの赤外線を受光して、チャンネルの変更、音量の調整など各種の制御を行っている。   On the other hand, television receivers using LCDs, CRTs, etc. receive infrared rays from an infrared remote controller and perform various controls such as channel change and volume adjustment.

このため、照度センサが赤外線リモコンの影響を受けて、輝度調整を行ってしまう。これに対処するために、照度センサに赤外光をカットする赤外線カットフィルタを装着している。
特開２００５−２９５４３９号公報 For this reason, the illuminance sensor is affected by the infrared remote controller and adjusts the brightness. In order to deal with this, an infrared cut filter for cutting infrared light is attached to the illuminance sensor.
JP 2005-295439 A

しかるに、赤外線カットフィルタの赤外線カット能力は十分ではなく、照度センサが赤外線リモコンからの赤外光の影響を受けて、輝度調整が実行されてしまうなどの誤動作が発生している。   However, the infrared cut filter has insufficient infrared cut capability, and malfunctions such as brightness adjustment being performed by the illuminance sensor being affected by the infrared light from the infrared remote controller have occurred.

本発明は上記の点に鑑みなされたもので、不要光を確実にカットできる光検出装置を提供することを目的とする。   The present invention has been made in view of the above points, and an object of the present invention is to provide a light detection device capable of reliably cutting unnecessary light.

本発明は、外部光を検出する光検出装置において、外部光から不要光を除去した光に応じた検出信号を出力する第１の光検出部（１２１）と、外部光を検出し、第１の光検出部（１２１）の検出信号から外部光に応じた検出信号を減算する第２の光検出部（１２２）とを有することを特徴とする。   The present invention provides a photodetection device that detects external light, a first photodetection unit (121) that outputs a detection signal according to light obtained by removing unnecessary light from external light, and external light, And a second photodetection unit (122) that subtracts a detection signal corresponding to the external light from the detection signal of the photodetection unit (121).

第１の光検出部（１２１）は、不要光成分を除去するフィルタ（１３１）と、フィルタ（１３１）を通した光を検出する光検出回路（１３２）とを有することを特徴とする。   The first light detection unit (121) includes a filter (131) that removes unnecessary light components and a light detection circuit (132) that detects light that has passed through the filter (131).

光検出回路（１３２）は、フィルタ（１３１）を通した光を検出する第１の光検出素子（１４１）と、第１の光検出素子（１４１）に流れる電流に応じた光検出信号を出力するアンプ（１４２）とを有することを特徴とする。   The photodetection circuit (132) outputs a first photodetection element (141) that detects light that has passed through the filter (131), and a photodetection signal that corresponds to the current flowing through the first photodetection element (141). And an amplifier (142).

第２の光検出部（１２２）は、外部光を検出する第２の光検出素子（１５１）と、第２の光検出素子（１５１）に流れる電流に応じて第１の光検出素子（１５１）に流れる電流を制御する制御回路（１５２、３２１）とを有することを特徴とする。   The second light detection unit (122) includes a second light detection element (151) that detects external light, and a first light detection element (151) according to a current flowing through the second light detection element (151). And a control circuit (152, 321) for controlling the current flowing in the circuit.

第２の光検出部（１２２）は、第２の光検出素子（１５１）に流れる電流に応じた光検出信号を出力する出力回路（１５３）を有することを特徴とする。   The second light detection unit (122) includes an output circuit (153) that outputs a light detection signal corresponding to a current flowing through the second light detection element (151).

なお、上記参照符号はあくまでも参考であり、これによって、特許請求の範囲が限定されるものではない。   In addition, the said reference code is a reference to the last, This does not limit a claim.

本発明によれば、外部光から不要光を除去した光に応じた検出信号を外部光に応じた検出信号を減算することにより、不要光成分を除去した検出信号が得られる。     According to the present invention, a detection signal from which unnecessary light components are removed can be obtained by subtracting a detection signal in accordance with external light from a detection signal in accordance with light from which unnecessary light has been removed from external light.

図１は本発明の一実施例のブロック構成図、図２は本発明の一実施例の斜視図を示す。   FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a perspective view of an embodiment of the present invention.

本実施例の光検出装置１００は、１チップの半導体チップ１１１上に第１の光検出部１２１及び第２の光検出部１２２が搭載された構成とされている。   The light detection device 100 of the present embodiment is configured such that a first light detection unit 121 and a second light detection unit 122 are mounted on a single chip semiconductor chip 111.

第１の光検出部１２１は、光学フィルタ１３１及び第１の光検出回路１３２から構成されている。光学フィルタ１３１は、不要光成分を除去するフィルタであり、例えば、赤外線カットフィルタから構成されている。光学フィルタ１３１を透過した光が第１の光検出回路１３２に供給される。   The first light detection unit 121 includes an optical filter 131 and a first light detection circuit 132. The optical filter 131 is a filter that removes unnecessary light components, and includes, for example, an infrared cut filter. The light transmitted through the optical filter 131 is supplied to the first light detection circuit 132.

第１の光検出回路１３２は、フォトダイオード１４１、アンプ１４２から構成されている。フォトダイオード１４１は、アノードが電流調整端子Ｔ11及びアンプ１３２の入力端子に接続され、カソードが電源端子Ｔ12に接続されている。フォトダイオード１４１は、光学フィルタ１３１を透過した光、すなわち、赤外光がカットされた光に応じた電流をアノードから出力する。アノードから出力された電流は電流調整端子Ｔ11から出力される。   The first photodetection circuit 132 includes a photodiode 141 and an amplifier 142. The photodiode 141 has an anode connected to the current adjustment terminal T11 and the input terminal of the amplifier 132, and a cathode connected to the power supply terminal T12. The photodiode 141 outputs a current corresponding to light transmitted through the optical filter 131, that is, light from which infrared light has been cut, from the anode. The current output from the anode is output from the current adjustment terminal T11.

アンプ１４２は、電源端子Ｔ12と接地端子Ｔ13との間に接続されており、電源端子Ｔ12に供給される電源電圧Ｖccにより駆動され、フォトダイオード１４１のアノードの電流を増幅して、出力端子Ｔ14から出力する。   The amplifier 142 is connected between the power supply terminal T12 and the ground terminal T13, is driven by the power supply voltage Vcc supplied to the power supply terminal T12, amplifies the current of the anode of the photodiode 141, and outputs from the output terminal T14. Output.

このとき、アンプ１４２の入力は、第２の光検出部１２２によって外部光の成分が減算された信号となる。   At this time, the input of the amplifier 142 is a signal obtained by subtracting the component of the external light by the second light detection unit 122.

第２の光検出部１２２は、フォトダイオード１５１及び制御回路１５２、並びに、出力回路１５３から構成されている。フォトダイオード１５１は、アノードが制御回路１５２に接続され、カソードが電源端子Ｔ22に接続されている。フォトダイオード１５１には、外部光が入射しており、入射した外部光に応じた電流をアノードから出力する。アノードから出力された検出電流は、制御回路１５２に供給される。   The second light detection unit 122 includes a photodiode 151, a control circuit 152, and an output circuit 153. The photodiode 151 has an anode connected to the control circuit 152 and a cathode connected to the power supply terminal T22. External light is incident on the photodiode 151, and a current corresponding to the incident external light is output from the anode. The detection current output from the anode is supplied to the control circuit 152.

制御回路１５２は、ＮＰＮトランジスタＱ11〜Ｑ13から構成されており、トランジスタＱ11〜Ｑ13によりカレントミラー回路を構成している。制御回路１５２は、フォトダイオード１５１のアノードから供給される電流に応じた電流をトランジスタＱ12により制御端子Ｔ21から接地端子Ｔ23に引き込むとともに、トランジスタＱ13により出力回路１５３から引き込む。これによって、第２の光検出部１２２は、外部光に応じた電流を第１の光検出部１２１の電流調整端子Ｔ11から減算する。   The control circuit 152 includes NPN transistors Q11 to Q13, and the transistors Q11 to Q13 form a current mirror circuit. The control circuit 152 draws a current corresponding to the current supplied from the anode of the photodiode 151 from the control terminal T21 to the ground terminal T23 by the transistor Q12 and draws it from the output circuit 153 by the transistor Q13. Thereby, the second light detection unit 122 subtracts the current corresponding to the external light from the current adjustment terminal T11 of the first light detection unit 121.

出力回路１５３は、ＰＮＰトランジスタＱ21、Ｑ22から構成されており、トランジスタＱ21、Ｑ22からカレントミラー回路を構成している。出力回路１５３は、制御回路１５２にトランジスタＱ13から引き込まれた電流をトランジスタＱ21により検出し、トランジスタＱ22により出力端子Ｔ24から出力することになる。   The output circuit 153 includes PNP transistors Q21 and Q22, and the transistors Q21 and Q22 form a current mirror circuit. The output circuit 153 detects the current drawn from the transistor Q13 in the control circuit 152 by the transistor Q21, and outputs it from the output terminal T24 by the transistor Q22.

図３は本発明の一実施例の動作説明図を示す。図３は、光の波長に対する光の強度の特性を示している。   FIG. 3 is an operation explanatory diagram of one embodiment of the present invention. FIG. 3 shows the light intensity characteristic with respect to the light wavelength.

第１の光検出部１２１で検出される光は、光学フィルタ１３１により赤外光以下の光成分が除去された成分となる。このとき、外部光に不要な赤外光が含まれない場合には、図３に破線で示すように６７０ｎｍ以下の赤外域で光の強度が低下した特性となる。また、外部光に不要な赤外光が含まれる場合には、図３に破線で示す特性にピッチの短い破線で示すように不要な赤外光の成分が重畳された特性となる。   The light detected by the first light detection unit 121 is a component obtained by removing light components equal to or lower than infrared light by the optical filter 131. At this time, when unnecessary infrared light is not included in the external light, the light intensity is lowered in the infrared region of 670 nm or less as shown by a broken line in FIG. Further, when unnecessary infrared light is included in the external light, unnecessary infrared light components are superimposed on the characteristic indicated by the broken line in FIG.

これに対して第２の光検出部１２２で検出される光は、外部光の成分である。このとき、外部光に不要な赤外光が含まれない場合には、図３に一点鎖線で示すような略平坦な特性となる。また、外部光に不要な赤外光成分が含まれる場合には、図３に二点鎖線で示すように含まれる赤外光の成分が重畳された特性となる。この波形に応じた出力が出力端子Ｔ24から出力される。出力端子Ｔ24から出力される検出信号は、赤外光成分を含んでいるので、これをリモコン用の検出信号として用いることができる。   On the other hand, the light detected by the second light detection unit 122 is a component of external light. At this time, when unnecessary infrared light is not included in the external light, a substantially flat characteristic as shown by a one-dot chain line in FIG. 3 is obtained. Further, when an unnecessary infrared light component is included in the external light, the infrared light component included is superimposed as shown by a two-dot chain line in FIG. An output corresponding to this waveform is output from the output terminal T24. Since the detection signal output from the output terminal T24 includes an infrared light component, it can be used as a detection signal for a remote controller.

図３に破線で示す第１の光検出部１２１の出力に相当する強度波形から図３に鎖線で示す第２の光検出部１２２の出力に相当する強度波形を減算することにより、図３に実線で示すように不要光である赤外光を除去した強度波形を出力することが可能となる。   3 is subtracted from the intensity waveform corresponding to the output of the first photodetection unit 121 indicated by the broken line in FIG. 3 from the intensity waveform corresponding to the output of the second photodetection unit 122 indicated by the chain line in FIG. As indicated by the solid line, it is possible to output an intensity waveform from which infrared light, which is unnecessary light, is removed.

本実施例によれば、外部光から不要光を除去した光に応じた検出信号を外部光に応じた検出信号を減算することにより、不要光成分を除去した検出信号が得られる。また、赤外光成分を含んだ検出信号も得られるので、輝度調整のための外部光の調整だけでなく、リモコンからの赤外光の検出も可能となる。   According to this embodiment, a detection signal in which unnecessary light components are removed can be obtained by subtracting a detection signal in accordance with external light from a detection signal in accordance with light obtained by removing unnecessary light from external light. In addition, since a detection signal including an infrared light component can be obtained, not only adjustment of external light for brightness adjustment but also detection of infrared light from a remote controller can be performed.

また、第１の光検出部１２１は、赤外線除去フィルタを搭載しており、通常、外部光を検出する場合に用いられる光検出装置と同様な構成であるので、既存の光検出装置に第２の光検出部１２２を追加するだけで、対応ができ、実現が容易となる。   In addition, the first light detection unit 121 is equipped with an infrared ray removal filter, and normally has the same configuration as the light detection device used when detecting external light. It is possible to cope with this by simply adding the light detection unit 122, and the realization becomes easy.

図４は光検出装置１００の適用例のシステム構成図を示す。   FIG. 4 is a system configuration diagram of an application example of the light detection apparatus 100.

本適用例のシステム２００は、テレビジョン受像機２１１の輝度調整に本実施例の光検出装置１００を適用したものである。   The system 200 of this application example is obtained by applying the light detection apparatus 100 of this embodiment to the luminance adjustment of the television receiver 211.

テレビジョン受像機２１１は、映像信号入力回路２２１，映像信号処理回路２２２、ドライバ回路２２３、ディスプレイ２２４、リモコンインタフェース回路２２５から構成されている。   The television receiver 211 includes a video signal input circuit 221, a video signal processing circuit 222, a driver circuit 223, a display 224, and a remote control interface circuit 225.

映像信号源２１２から供給された映像信号は、映像信号入力回路２２１に供給される。映像信号入力回路２２１は、映像信号源２１２からの複数の映像信号から受像したい映像信号を選択するとともに、入力された映像信号を映像信号処理回路２２２で処理が可能な信号に変換する処理を行う。   The video signal supplied from the video signal source 212 is supplied to the video signal input circuit 221. The video signal input circuit 221 selects a video signal to be received from a plurality of video signals from the video signal source 212 and converts the input video signal into a signal that can be processed by the video signal processing circuit 222. .

映像信号処理回路２２２は、映像信号入力回路２２１から供給された映像信号から輝度成分、カラー成分、同期信号成分などを分離するなどの信号処理を行い、ドライバ回路２２３に供給する。ドライバ回路２２３は、映像信号処理回路２２２からの映像信号に応じてディスプレイ２２４を駆動する。ディスプレイ２２４は、例えば、ＬＣＤ、ＣＲＴなどの受像機であり、ドライバ回路２２３により駆動されて、映像信号に応じた映像を表示する。   The video signal processing circuit 222 performs signal processing such as separating a luminance component, a color component, a synchronization signal component, and the like from the video signal supplied from the video signal input circuit 221 and supplies the processed signal to the driver circuit 223. The driver circuit 223 drives the display 224 in accordance with the video signal from the video signal processing circuit 222. The display 224 is a receiver such as an LCD or CRT, for example, and is driven by the driver circuit 223 to display an image corresponding to the video signal.

光検出装置１００には、外部光Ｌo及び赤外線リモコン２１３からの赤外光Ｌrが入射しており、端子Ｔ14から赤外光成分を除去した検出信号が出力され、端子Ｔ24から外部光Ｌｏと赤外光Ｌｒとを含む検出信号が出力される。光検出装置１００の端子Ｔ14は、映像信号処理回路２２２に接続される。また、光検出装置１００の端子Ｔ24は、リモコンインタフェース回路２２５に接続される。   The external light Lo and the infrared light Lr from the infrared remote controller 213 are incident on the light detection device 100, and a detection signal from which the infrared light component is removed is output from the terminal T14. The external light Lo and red are output from the terminal T24. A detection signal including the external light Lr is output. A terminal T 14 of the photodetecting device 100 is connected to the video signal processing circuit 222. The terminal T24 of the photodetecting device 100 is connected to the remote control interface circuit 225.

映像信号処理回路２２２は、光検出装置１００の端子Ｔ14から赤外光成分を除去した検出信号に応じてディスプレイ２２４の輝度が最適になるように映像信号の処理を行う。   The video signal processing circuit 222 processes the video signal so that the luminance of the display 224 is optimized in accordance with the detection signal obtained by removing the infrared light component from the terminal T14 of the light detection device 100.

リモコンインタフェース回路２２５は、赤外線リモコン２１３から赤外光Ｌｒに応じてチャンネルの切替や音量の調整を行うための回路であり、光検出装置１００の赤外光成分を含む検出信号を出力する出力端子Ｔ24から検出信号を受信し、検出信号から赤外線リモコン２１３からの制御信号を抽出して、抽出した制御信号に応じて映像信号入力回路２２１及び映像信号処理回路２２２などを制御することにより、チャンネルの切替や音量の調整を行っている。   The remote control interface circuit 225 is a circuit for performing channel switching and volume adjustment in accordance with the infrared light Lr from the infrared remote control 213, and an output terminal for outputting a detection signal including the infrared light component of the light detection device 100. By receiving the detection signal from T24, extracting the control signal from the infrared remote controller 213 from the detection signal, and controlling the video signal input circuit 221 and the video signal processing circuit 222 according to the extracted control signal, the channel Switching and adjusting the volume.

以上、本実施例の光検出装置１００をテレビジョン受像機２２１に適用することにより外部光の検出と赤外光の検出の両方を１チップの素子で行うことができ、輝度調整と赤外線リモコン２１３からの赤外光の受光の両方を兼用することができ、赤外線リモコン２１３からの赤外光を受光するための受光素子を削減できる。   As described above, by applying the light detection apparatus 100 of the present embodiment to the television receiver 221, both detection of external light and detection of infrared light can be performed by a single chip element, and brightness adjustment and infrared remote control 213 are performed. The infrared light from the infrared remote controller 213 can be shared, and the number of light receiving elements for receiving the infrared light from the infrared remote controller 213 can be reduced.

図５は本発明の他の実施例のブロック構成図を示す。同図中、図１と同一構成部分には同一符号を付し、その説明は省略する。   FIG. 5 shows a block diagram of another embodiment of the present invention. In the figure, the same components as in FIG.

本実施例の光検出装置３００は、第２の光検出部３１１の構成が図１に示す光検出装置１００とは相違している。   The light detection device 300 of the present embodiment is different from the light detection device 100 shown in FIG. 1 in the configuration of the second light detection unit 311.

本実施例の第２の光検出部３１１は、図１に示す出力回路１５３を削除して、外部光の検出信号の出力だけを行うようにしたものである。これによって制御回路３２１は出力回路１５３に電流を供給するためのトランジスタＱ13を削除することができ、トランジスタＱ11、Ｑ12によって構成されている。   The second light detection unit 311 of this embodiment is such that the output circuit 153 shown in FIG. 1 is deleted and only the detection signal of external light is output. As a result, the control circuit 321 can eliminate the transistor Q13 for supplying current to the output circuit 153, and is constituted by transistors Q11 and Q12.

本実施例によれば、回路構成を簡略化でき、チップを小型化できる。   According to this embodiment, the circuit configuration can be simplified and the chip can be miniaturized.

なお、上記実施例では、フォトダイオードにより光を検出する構成について説明したが、フォトトランジスタであってもよく、要は光を検出できるデバイスであればこれに限定されるものではない。   In the above-described embodiment, the configuration in which light is detected by the photodiode has been described. However, a phototransistor may be used, and the device is not limited to this as long as the device can detect light.

また、本実施例では、第２の光検出部１２２、３１１には、外部光が入射する構成としたが、不要光を透過する光学フィルタ、例えば、赤外線透過フィルタを透過した光を入射させ、不要光に応じた電流を減算するようにしてもよい。   In the present embodiment, the external light is incident on the second light detection units 122 and 311. However, an optical filter that transmits unnecessary light, for example, light that has passed through an infrared transmission filter is incident. You may make it subtract the electric current according to unnecessary light.

さらに、本実施例では、第１の光検出部１２１と第２の光検出部１２２、３１１を同一ＩＣチップ上に搭載したが、第１の光検出部１２１と第２の光検出部１２２、３１１とを別の部品で構成してもよい。これにより、例えば、第１の光検出部１２１を既存の部品で構成することができ、搭載装置に大幅な変更を行うことなく、本発明の装置構成を搭載することが可能となる。   Furthermore, in the present embodiment, the first light detection unit 121 and the second light detection units 122 and 311 are mounted on the same IC chip, but the first light detection unit 121 and the second light detection unit 122, You may comprise 311 by another component. As a result, for example, the first light detection unit 121 can be configured with existing components, and the apparatus configuration of the present invention can be mounted without significantly changing the mounting apparatus.

本発明の一実施例のブロック構成図である。It is a block block diagram of one Example of this invention. 本発明の一実施例の斜視図である。It is a perspective view of one Example of this invention. 本発明の一実施例の動作説明図である。It is operation | movement explanatory drawing of one Example of this invention. 光検出装置１００の適用例のシステム構成図である。1 is a system configuration diagram of an application example of a light detection apparatus 100. FIG. 本発明の他の実施例のブロック構成図である。It is a block block diagram of the other Example of this invention.

符号の説明Explanation of symbols

１００、３００ 光検出装置
１１１ 半導体チップ
１２１ 第１の光検出部、１２２、３１１ 第２の光検出部
１３１ 光学フィルタ、１３２ 光検出回路
１４１、１５１ フォトダイオード、１４２ アンプ
１５２、３２１ 制御回路、１５３ 出力回路 DESCRIPTION OF SYMBOLS 100, 300 Photodetector 111 Semiconductor chip 121 1st photon detection part, 122, 311 2nd photon detection part 131 Optical filter, 132 Photodetection circuit 141, 151 Photodiode, 142 Amplifier 152,321 Control circuit, 153 Output circuit

Claims (5)

外部光を検出する光検出装置において、
外部光から不要光を除去した光を検出する第１の光検出部と、
前記外部光を検出し、前記第１の光検出部の検出信号から前記外部光に応じた検出信号を減算する第２の光検出部とを有することを特徴とする光検出装置。 In the light detection device for detecting external light,
A first light detection unit for detecting light obtained by removing unnecessary light from external light;
And a second light detection unit that detects the external light and subtracts a detection signal corresponding to the external light from a detection signal of the first light detection unit. 前記第１の光検出部は、不要光成分を除去するフィルタと、
前記フィルタと通した光を検出する光検出回路とを有することを特徴とする請求項１記載の光検出装置。 The first light detection unit includes a filter that removes unnecessary light components;
The photodetection device according to claim 1, further comprising a photodetection circuit that detects light that has passed through the filter. 前記光検出回路は、前記フィルタを通した光を検出する第１の光検出素子と、
前記第１の光検出素子に流れる電流に応じた光検出信号を出力するアンプとを有することを特徴とする請求項２記載の光検出装置。 The photodetection circuit includes a first photodetection element that detects light that has passed through the filter,
The photodetecting device according to claim 2, further comprising an amplifier that outputs a photodetection signal corresponding to a current flowing through the first photodetecting element. 前記第２の光検出部は、外部光を検出する第２の光検出素子と、
前記第２の光検出素子に流れる電流に応じて前記第１の光検出素子に流れる電流を制御する制御回路とを有することを特徴とする請求項３記載の光検出装置。 The second light detection unit includes a second light detection element that detects external light;
4. The photodetecting device according to claim 3, further comprising a control circuit that controls a current flowing through the first photodetecting element in accordance with a current flowing through the second photodetecting element. 前記第２の光検出部は、前記第２の光検出素子に流れる電流に応じた第２の光検出信号を出力する出力回路を有することを特徴とする請求項４記載の光検出装置。 The photodetection device according to claim 4, wherein the second photodetection unit includes an output circuit that outputs a second photodetection signal corresponding to a current flowing through the second photodetection element.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008157789A (en) * 2006-12-25 2008-07-10 Matsushita Electric Works Ltd Light detecting device, lighting system using the same and luminaire
JP2011510264A (en) * 2008-01-22 2011-03-31 シャープ株式会社 Spectrally compensated light sensor
JP2012003201A (en) * 2010-06-21 2012-01-05 Sharp Corp Graphic display device
JP2016206503A (en) * 2015-04-24 2016-12-08 Jsr株式会社 Radiation sensitive resin composition, infrared shielding film, forming method therefor, solid state imaging sensor, and illuminance sensor

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503473B1 (en) * 1964-09-04 1975-02-05
JPS5028782A (en) * 1973-07-13 1975-03-24
JPS5587127A (en) * 1978-12-20 1980-07-01 Ibm Device for isolating optical signal from surrounding light
JPS6273824A (en) * 1985-09-27 1987-04-04 Nec Corp Photodetection system for optical telephone set
JPH0534199A (en) * 1991-08-02 1993-02-09 Matsushita Electric Ind Co Ltd Light emission measuring apparatus
JPH08330621A (en) * 1995-05-31 1996-12-13 Noritz Corp Optical sensor
JP2002176192A (en) * 2000-09-12 2002-06-21 Rohm Co Ltd Illuminance sensor chip, illuminance sensor, equipment and method for measuring illuminance
JP2002324910A (en) * 2001-04-25 2002-11-08 Toshiba Corp Optical semiconductor device

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS503473B1 (en) * 1964-09-04 1975-02-05
JPS5028782A (en) * 1973-07-13 1975-03-24
JPS5587127A (en) * 1978-12-20 1980-07-01 Ibm Device for isolating optical signal from surrounding light
JPS6273824A (en) * 1985-09-27 1987-04-04 Nec Corp Photodetection system for optical telephone set
JPH0534199A (en) * 1991-08-02 1993-02-09 Matsushita Electric Ind Co Ltd Light emission measuring apparatus
JPH08330621A (en) * 1995-05-31 1996-12-13 Noritz Corp Optical sensor
JP2002176192A (en) * 2000-09-12 2002-06-21 Rohm Co Ltd Illuminance sensor chip, illuminance sensor, equipment and method for measuring illuminance
JP2002324910A (en) * 2001-04-25 2002-11-08 Toshiba Corp Optical semiconductor device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008157789A (en) * 2006-12-25 2008-07-10 Matsushita Electric Works Ltd Light detecting device, lighting system using the same and luminaire
JP2011510264A (en) * 2008-01-22 2011-03-31 シャープ株式会社 Spectrally compensated light sensor
JP2012003201A (en) * 2010-06-21 2012-01-05 Sharp Corp Graphic display device
JP2016206503A (en) * 2015-04-24 2016-12-08 Jsr株式会社 Radiation sensitive resin composition, infrared shielding film, forming method therefor, solid state imaging sensor, and illuminance sensor

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