PROBLEM TO BE SOLVED: To enable detection of defects of the mechanical structure part (structure) of the device.SOLUTION: The optical deflector includes: a structure having a mirror part with a reflection surface, a torsion bar connected to the mirror part, and a cantilever connected to the torsion bar; a piezoelectric part 220 in the cantilever; and a defect detector 1000 detecting a defect of the structure. The defect detector 1000 includes: a signal generator 1100 for applying a periodically changing voltage to the piezoelectric part, the voltage (applied signal) having a variable frequency; and a current detector 1200 for detecting a change of a current flowing in the piezoelectric part 220 to a change of the frequency of the applied signal. In that case, the optical deflector can detect a defect of the mechanical structure part (structure) of the device.SELECTED DRAWING: Figure 16

    【課題】 装置の機械的構造部(構造体)の故障を検知することができる。【解決手段】 光偏向装置は、反射面を有するミラー部と、該ミラー部に接続されたトーションバーと、該トーションバーに接続されたカンチレバーとを含む構造体と、該カンチレバーに設けられた圧電部220と、構造体の故障を検知する故障検知装置1000と、を備え、該故障検知装置1000は、圧電部に周期的に変化する電圧を印加する、該電圧(印加信号)の周波数を可変な信号発生器1100と、印加信号の周波数変化に対する圧電部220に流れる電流の変化を検出する電流検出回路1200と、を含む。この場合、装置の機械的構造部(構造体)の故障を検知することが可能な光偏向装置を提供できる。【選択図】図16


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    Title :

    OPTICAL DEFLECTOR, OPTICAL SCANNER, IMAGE PROJECTION DEVICE, AND FAILURE DETECTION METHOD


    Additional title:

    光偏向装置、光走査装置、画像投影装置及び故障検知方法


    Contributors:

    Publication date :

    2018-01-11


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR / G01S RADIO DIRECTION-FINDING , Funkpeilung




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