To provide a light deflector that can increase the accuracy in detecting the angle of oscillation of the light deflector.SOLUTION: A light deflector comprises: a reflection part that includes a reflection surface for reflecting light; support parts that are connected with the reflection part at one ends; a stationary part that is connected with the other ends of the support parts; piezoelectric members that deform the support parts to oscillate the reflection part; a frequency detection part that detects the frequency of a driving signal input to the piezoelectric members; a displacement amount detection part that detects the amount of displacement of the piezoelectric members; and an operation part that calculates the angle of oscillation of the reflection part based at least on frequency information on the frequency detected by the frequency detection part and displacement amount information on the amount of displacement detected by the displacement amount detection part.SELECTED DRAWING: Figure 16

    【課題】光偏向器の揺動角の検知精度を高めることができる光偏向器を提供する。【解決手段】光を反射する反射面を有する反射部と、前記反射部と一端で接続される支持部と、前記支持部の他端と接続される固定部と、前記支持部を変形させて、前記反射部を揺動させる圧電部材と、前記圧電部材に入力された駆動信号の周波数を検出する周波数検出部と、前記圧電部材の変位量を検出する変位量検出部と、を有し、少なくとも、前記周波数検出部で検出された周波数の周波数情報と、前記変位量検出部で検出された変位量の変位量情報と、に基づいて、前記反射部の揺動角を演算する演算部を有することを特徴とする光偏向器により、上記課題を解決する。【選択図】図16


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    Title :

    LIGHT DEFLECTOR, IMAGE PROJECTION DEVICE, HEAD-UP DISPLAY, LASER HEAD LAMP, HEAD-MOUNTED DISPLAY, OBJECT RECOGNITION DEVICE, AND VEHICLE


    Additional title:

    光偏向器、画像投影装置、ヘッドアップディスプレイ、レーザヘッドランプ、ヘッドマウントディスプレイ、物体認識装置、及び車両


    Contributors:

    Publication date :

    2021-05-06


    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 / B60Q ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL , Anordnung von Signal- oder Beleuchtungsvorrichtungen, deren Einbau oder Halterung oder deren Schaltkreise bei Fahrzeugen allgemein / F21V FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF , Funktionsmerkmale oder Einzelheiten von Leuchten oder Beleuchtungssystemen / G01S RADIO DIRECTION-FINDING , Funkpeilung