PROBLEM TO BE SOLVED: To capture an optical pattern with high accuracy even when an imaging unit defocuses as a movable holding member moves.SOLUTION: An object information acquisition apparatus includes a holding member including the movable holding member configured to be movable in a direction of sandwiching an object, an irradiation member configured to irradiate the object with light from a light source through the holding member, an acoustic wave detection unit configured to receive an acoustic wave generated in the object by the light and to convert the acoustic wave into an electrical signal, a processing unit configured to acquire information in the object by using the electrical signal, a light diffusion member configured to be arranged on the movable holding member, and the imaging unit configured to capture an optical pattern formed when the light diffusion member is irradiated with the light, wherein the imaging unit is configured to be capable of adjusting a focus according to a movement of the movable holding member.COPYRIGHT: (C)2013,JPO&INPIT【課題】 可動保持部材の移動に伴い、撮像部の焦点がずれるため光学パターンが精度よく撮像できない。【解決手段】 本発明の被検体情報取得装置は、被検体を狭持する方向に移動可能な可動保持部材を有する保持部材と、保持部材を介して光源からの光を前記被検体に照射する照射部材と、前記光により被検体内で発生する音響波を受信して電気信号に変換する音響波検出手段と、前記電気信号を用いて被検体内の情報を取得する処理部と、前記可動保持部材に配置された光拡散部材と、前記光が前記光拡散部材に照射された時に形成される光学パターンを撮像する撮像部と、を有し、前記撮像部は、前記可動保持部材の移動に伴って、焦点を調整可能に構成されている。【選択図】 図1
