Importance

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Abstract

The present invention provides a finger vein authentication unit which solves problems such that a turn of a finger around the finger as an axis cannot be detected from an image of the finger, a finger cannot be placed normally because the nail is caught in a dent portion, and an image of the contour of a finger cannot be obtained by an image capturing method using an image pickup window which is narrower than a finger and is completely closed with a finger so that a turn of a finger cannot be detected from the counter. A touch sensor having an X-Y matrix capable of obtaining the position and shape of a fingertip is mounted in a fingertip placement part, and the fingertip placement part is formed in a flat shape so that a finger is easily put. From the data of the position and shape of the fingertip read by the sensor, a turn of the finger around the optical axis of the camera as a center, a turn of the finger around the finger as an axis, and a positional deviation of the finger are detected. On the basis of the data, the vein is extracted accurately and used for a guidance to the user so that the user can put his/her finger in the correct position.

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First Claim