LIGHT-RECEIVING ELEMENT MULTIPLEXER AND SCANNING LASER RADAR DEVICE

PROBLEM TO BE SOLVED: To provide a light-receiving element multiplexer for switching and outputting signals outputted from a plurality of light receiving elements, which can appropriately detect a failure mode.SOLUTION: A light receiving element multiplexer 100 includes: a plurality of light receivi...

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Hauptverfasser: MANNAMI AKIRA, NISHIGUCHI TADAO
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a light-receiving element multiplexer for switching and outputting signals outputted from a plurality of light receiving elements, which can appropriately detect a failure mode.SOLUTION: A light receiving element multiplexer 100 includes: a plurality of light receiving elements PD, a first light source LED1 that irradiates light so that the light receiving intensities of the light receiving elements are different from each other; a control unit CTL for controlling lighting of the first light source; a multiplexer MUX connected to each of the plurality of light receiving elements, for switching input signals from the light receiving elements and outputting the input signals; and a failure detection unit FD for detecting a failure of the multiplexer on the basis of a first output value of the multiplexer when the control unit turns on the first light source while the multiplexer is in the first connection state and a second output value of the multiplexer when the control unit turns on the first light source while the multiplexer is in a second connection state.SELECTED DRAWING: Figure 1 【課題】 複数の受光素子が出力した信号を切り替えて出力する受光素子用マルチプレクサにおいて、故障モードを適切に検出する。【解決手段】 複数の受光素子PDと、各受光素子における受光強度が異なるように光を照射する第1光源LED1と、第1光源の点灯を制御する制御部CTLと、複数の受光素子のそれぞれに接続され、各受光素子からの入力信号を切り替えて出力するマルチプレクサMUXと、マルチプレクサが第1接続状態にある時に制御部が第1光源を点灯した場合のマルチプレクサの第1出力値と、マルチプレクサが第2接続状態にある時に制御部が第1光源を点灯した場合のマルチプレクサの第2出力値に基づいて、マルチプレクサの故障を検出する故障検出部FDとを備える受光素子用マルチプレクサ100。【選択図】 図1