PROBLEM TO BE SOLVED: To provide a small-diameter optical scanning device including a heater and a thermistor.SOLUTION: An optical scanning device includes: a scanning optical unit a temperature sensor at which a resistance value corresponding to a temperature in the scanning optical unit is set a heater that hearts the inside of the scanning optical unit in accordance with an application voltage a voltage control circuit that includes a current input terminal, into which a current flowing through the temperature sensor is inputted, and controls the application voltage applied to the heater on the basis of the inputted current a first wire whose one end is connected to one end of the heater and one end of the temperature sensor and whose other end is connected to an application voltage output terminal of the voltage control circuit a second wire whose one end is connected to the other end of the heater and whose other end is connected to a ground terminal of the voltage control circuit and a third wire whose one end is connected to the other end of the temperature sensor and whose other end is connected to the current input terminal of the voltage control circuit.COPYRIGHT: (C)2014,JPO&INPIT【課題】ヒータ及びサーミスタを備えつつも、細径の光走査装置を提供すること。【解決手段】走査光学ユニットを備えた光走査装置が、走査光学ユニット内の温度に応じた抵抗値が設定される温度センサと、印加される電圧に応じて走査光学ユニット内を加熱するヒータと、温度センサを流れる電流が入力される電流入力端子を備え、該入力された電流に基づいてヒータに印加する印加電圧を制御する電圧制御回路と、一端がヒータの一端と温度センサの一端に接続され、他端が電圧制御回路の印加電圧の出力端子に接続される第1ワイヤと、一端がヒータの他端に接続され、他端が電圧制御回路のグラウンド端子に接続される第2ワイヤと、一端が温度センサの他端に接続され、他端が電圧制御回路の電流入力端子に接続される第3ワイヤと、を備える。【選択図】図3
