Personal identification device e.g. for preventing unauthorized use of item, such as key, through loss or theft, has light source arranged horizontally relative to image detection surface of finger

摘要

A personal identification/recognition device has, an image detection part (112) for detecting the light and a light quantum-adjustment unit (116) for adjusting the amount of light transmitting through the finger and entering the image detection part, as well as the amount light reflected through the lateral surfaces of the finger and entering the image detection part. The light source is arranged in a horizontal or horizontal inclined direction relative to an image detection surface of the finger. An independent claim is included for a personal identification system.