PROBLEM TO BE SOLVED: To reduce cost of an image capturing device with a wavelength-swept light source by employing an inexpensively configured frequency doubling circuit.SOLUTION: An image capturing device includes a light source unit configured to emit light while sweeping the frequency of the light an interference unit configured to split the light from the light source into reference light and irradiation light for irradiating a subject, and generate interference light from the reference light and light reflected from the subject a clock signal generator unit configured to generate a clock signal on the basis of the light from the light source a splitter unit configured to split the light from the light source into light entering the clock signal generator unit and light entering the interference unit a detection unit configured to detect the interference light and generate an interference signal in synchronization with the clock signal and an information acquisition unit configured to acquire information on the subject on the basis of the interference signal. The clock signal generator unit includes a frequency doubling circuit which includes a resistor and a delay circuit including a capacitor and is configured to double the frequency of the clock signal by obtaining an exclusive OR of the clock signal based on the light from the light source unit and a signal obtained by delaying the clock signal using the delay circuit.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】安価な構成を有する周波数倍化回路を用いることで、波長掃引光源を用いた撮像装置のコストを軽減する。【解決手段】光の周波数を掃引し、光を射出する光源部と、光源部からの光を参照光と被検体へ照射する照射光とに分岐し、参照光と被検体から反射された反射光とによる干渉光を発生させる干渉部と、光源部からの光に基づいてクロック信号を生成するクロック信号生成部と、光源部からの光をクロック信号生成部に入射する光及び干渉部に入射する光に分岐する分岐部と、干渉光を検出しクロック信号と同期して干渉信号を生成する検出部と、干渉信号に基づいて被検体の情報を取得する情報取得部とを備え、クロック信号生成部は、抵抗とコンデンサを含む遅延回路を有し、光源部からの光に基づくクロック信号と、クロック信号を遅延回路により遅延させた信号との排他的論理和をとることでクロック信号の周波数を倍化する周波数倍化回路を含む、撮像装置。【選択図】 図3
