| 摘要 |
A two-dimensional photosensor (2) is formed on a surface light source (1), and a transparent conductive layer (3) made of ITO or the like is formed on the two-dimensional photosensor (2). The transparent conductive layer (3) dissipates static electricity and is grounded. Even if a finger in contact with the transparent conductive layer (3) on the two-dimensional photosensor (2) is charged with static electricity, this static electricity can dissipate via the transparent conductive layer (3). When the transparent conductive layer (3) is divided into two layers, and the finger simultaneously touches the two transparent conductive layers, a fingerprint reading start signal is obtained. Even if, therefore, the finger is charged with static electricity, the two-dimensional photosensor can be prevented from malfunction or damage by the static electricity. When a target object in contact between the transparent conductive layers is a copy having a different resistance value, reading is not performed, and the reliability can improve.
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