To suppress a higher harmonic superposed on a movable speed of a reflection part.SOLUTION: An optical deflection device according to one embodiment of the disclosed art has: a reflection part having a reflection surface; a movable part supporting the reflection part; a support part supporting the movable part; a piezoelectric drive part provided at the movable part, and driving the reflection part in response to a waveform of a drive voltage; and a drive voltage output part outputting two different drive voltages to the piezoelectric drive part. Waveforms of the two different drive voltages each have, in one cycle, a rise period in which the voltage rises, a fall period in which the voltage falls, a first constant voltage period in which the voltage is constant after the rise period and before the fall period, and a second constant voltage period in which the voltage is constant before the rise period and after the fall period. The ratio of the first voltage period of at least one of the waveforms of the two different drive voltages in one cycle is different from that of the second constant voltage in the one cycle.SELECTED DRAWING: Figure 28

    【課題】反射部の可動速度に重畳される高調波を抑制すること。【解決手段】開示の技術の一態様に係る光偏向装置は、反射面を有する反射部と、前記反射部を支持する可動部と、前記可動部を支持する支持部と、前記可動部に設けられ、駆動電圧の波形に応答して前記反射部を駆動させる圧電駆動部と、前記圧電駆動部に異なる2つの駆動電圧を出力する駆動電圧出力部と、を有し、前記異なる2つの駆動電圧の波形のそれぞれは、1周期内に、電圧が上昇する昇圧期間と、電圧が降下する降圧期間と、前記昇圧期間後で、かつ前記降圧期間前に、電圧が一定である第1定電圧期間と、前記昇圧期間前で、かつ前記降圧期間後に、電圧が一定である第2定電圧期間と、を含み、前記異なる2つの駆動電圧の波形のうちの少なくとも一方における前記第1定電圧期間の前記1周期内での割合は、前記第2定電圧期間の前記1周期内での割合と異なる。【選択図】図28


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    Titel :

    OPTICAL DEFLECTION DEVICE, IMAGE PROJECTION DEVICE, VEHICLE, AND ADJUSTMENT METHOD


    Weitere Titelangaben:

    光偏向装置、画像投影装置、車両、及び調整方法


    Beteiligte:

    Erscheinungsdatum :

    2020-11-26


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    G02B Optische Elemente, Systeme oder Geräte , OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS / B41J TYPEWRITERS , Schreibmaschinen / 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 / H04N PICTORIAL COMMUNICATION, e.g. TELEVISION , Bildübertragung, z.B. Fernsehen



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