Fingerprint detecting device having a fluid layer sealed in a gap
First Claim
1. A fingerprint detecting device comprising:
- a flat transparent body on which a skin surface of a finger is pressed, said transparent body having a surface constituted by a scattering surface with a fine three-dimensional unevenness, on which said skin surface is pressed;
a light source for irradiating incident light from an inside of said transparent body on said skin surface pressed against said surface of said transparent body;
a thin surface film layer formed on said surface of said transparent body via a small gap, on which a three-dimensional pattern of said skin surface is transferred by pressing said finger;
a fluid layer formed by sealing one of a gas and a liquid in the gap between said surface of said transparent body and said surface film layer, said fluid layer being pressed by said surface film layer on which said three-dimensional pattern of said skin surface is transferred; and
image detection means for detecting an image fingerprint pattern on the basis of the light from said light source, the reflection of which is changed at said surface of said transparent body, when said surface film layer comes into contact with said surface of said transparent body in accordance with said three-dimensional pattern of said skin surface.
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Accused Products
Abstract
A fingerprint detecting device includes a flat transparent body, a light source, a thin surface film layer, a fluid layer, and an image detection unit. The transparent body on which a skin surface of a finger is pressed has a surface constituted by a scattering surface with a fine three-dimensional unevenness. The light source irradiates incident light from an inside of the transparent body on the skin surface pressed against the surface of the transparent body. The surface film layer is formed on the surface of the transparent body via a small gap, on which a three-dimensional pattern of the skin surface is transferred by pressing the finger. The fluid layer is formed by sealing one of a gas and a liquid in the gap between the surface of the transparent body and the surface film layer, and is pressed by the surface film layer on which the three-dimensional pattern of the skin surface is transferred. The image detection unit detects an image fingerprint pattern on the basis of the light from the light source, the reflection of which is changed at the surface of the transparent body, when the surface film layer comes into contact with the surface of the transparent body in accordance with the three-dimensional pattern of the skin surface.
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Citations
13 Claims
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1. A fingerprint detecting device comprising:
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a flat transparent body on which a skin surface of a finger is pressed, said transparent body having a surface constituted by a scattering surface with a fine three-dimensional unevenness, on which said skin surface is pressed; a light source for irradiating incident light from an inside of said transparent body on said skin surface pressed against said surface of said transparent body; a thin surface film layer formed on said surface of said transparent body via a small gap, on which a three-dimensional pattern of said skin surface is transferred by pressing said finger; a fluid layer formed by sealing one of a gas and a liquid in the gap between said surface of said transparent body and said surface film layer, said fluid layer being pressed by said surface film layer on which said three-dimensional pattern of said skin surface is transferred; and image detection means for detecting an image fingerprint pattern on the basis of the light from said light source, the reflection of which is changed at said surface of said transparent body, when said surface film layer comes into contact with said surface of said transparent body in accordance with said three-dimensional pattern of said skin surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification