PROBLEM TO BE SOLVED: To provide a configuration of a clock generation unit suitable for comprehensively obtaining tomographic images in a desired depth range of a fundus oculus when a wide range of the fundus oculus is scanned in one pass.SOLUTION: An SS-OCT apparatus is configured as an interferometer in which a light path through which a portion of the light emitted from a light source unit pass is branched into a first light path and a second light path with the length different from the first light path. The apparatus comprises: a clock generation unit for generating a clock on which a conversion unit samples an analog signal and a tomographic image acquisition unit for capturing a tomographic image of a fundus oculus on the basis of a digital signal which is converted from the analog signal by the conversion unit on the generated clock. The clock generation unit includes a correction unit for correcting the intensity of analog signals of the second interference light, which interference light is obtained by the interference between the light in the first light path and the light in the second light path, such that the difference in the intensity of the second interference light falls within a range which allows the analog signals of the second interference light to enter the conversion unit.SELECTED DRAWING: Figure 6COPYRIGHT: (C)2017,JPO&INPIT【課題】 眼底の広範囲で1回の走査を行った際に、眼底の所望の深さ範囲の断層像を網羅的に取得するための好適なクロック発生部の構成を提供すること。【解決手段】 SS-OCT装置は、光源部から射出された光のうち一部の光が通る光路が第一光路と第一光路に対して光路長差を有する第二光路とに分岐された干渉計として構成され、変換部がアナログ信号をサンプリングするクロックを生成するクロック発生部と、生成されたクロックにより変換部がアナログ信号を変換して得たデジタル信号に基づいて眼底の断層像を取得する断層像取得部とを有し、クロック発生部は、第一光路の光と第二光路の光とを干渉して得た第二の干渉光のアナログ信号の強度の差が第二の干渉光のアナログ信号を変換部に入力可能な範囲内となるように第二の干渉光のアナログ信号の強度を補正する補正部を含む。【選択図】 図6
