PROBLEM TO BE SOLVED: To solve the problem in which, in a conventional technology, due to simultaneously photographing blood vessels of a plurality of fingers, a light source is arranged so that a principal direction of a hand, which is a direction directed from a wrist side to a fingertip of an arm, is parallel to a direction of radiation of light from the light source, but, in a posture of opening the fingers, the principal direction of the hand does not become parallel with the direction of radiation of the light source, and at this time, due to an imaging unit directly receiving light, which is radiated to a side of the fingers and is reflected, a luminance saturation (halation) region occurs on the finger side of the finger blood vessel image, and a clear blood vessel image cannot be obtained.SOLUTION: A blood vessel image pickup apparatus comprises an opening formed on a surface of a housing, a plurality of light sources arranged on a side of the opening, a sensor that acquires position information of a finger presented upon the opening and principal direction information of the finger, a light quantity control unit that selects a radiating light source for radiating the finger from among the plurality of light sources based on the position information and principal direction information and controls light quantity of the selected radiating light source, and an imaging unit that photographs an image of a blood vessel existing inside the finger radiated by light from the radiating light source.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】 従来技術では、同時に複数指の血管を撮影するため、腕の手首側から指先へ向かう方向である手の主方向と光源からの光の照射方向が平行になるように光源を配置している。しかし、指を開いた姿勢では、指の主方向が光源の照射方向と平行にならない。このとき、指側面に照射されて反射した光を撮像部が直接受光することにより、指血管画像の指側面に輝度飽和(ハレーション)領域が生じ、鮮明な血管画像が得ることができない。 【解決手段】 筺体表面に形成された開口部と、開口部の側方に配列された複数の光源と、開口部上に提示された指の位置情報及び指の主方向情報を取得するセンサと、位置情報及び主方向情報に基づき、指に照射する照射用光源を複数の光源の中から選択し、選択された照射用光源の光量を制御する光量制御部と、照射用光源からの光が照射された指の内部に存する血管の画像を撮影する撮影部と、を備える。【選択図】 図2
