Personal Indentification Device

• US 20080075330A1
• Filed: 10/04/2004
• Published: 03/27/2008
• Est. Priority Date: 10/04/2004
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Miyatake, Takafumi, Matsumura, Takafumi, Nagasaka, Akio
• Granted Patent: US 7,876,929 B2
• Time in Patent Office: Days
• US Class Current: 382/115
• CPC Class Codes: A61B 5/1172 using fingerprinting
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G06V 40/1341 Sensing with light passing through the finger
• CPC Class Codes: G06V 40/14 Vascular patterns
• CPC Class Codes: G07C 9/00563 using personal physical data of the operator, e.g. finger prints, retinal images, voicepatterns
• CPC Class Codes: G07C 9/26 using a biometric sensor integrated in the pass
• CPC Class Codes: G07C 9/37 using biometric data, e.g. fingerprints, iris scans or voice recognition

Abstract

The present invention provides a thin personal identification device that produces a high-quality image. The personal identification device includes an infrared light source 30; a transmission light quantity control element array 40, which includes a plurality of light transmission control elements for exercising control to transmit or block light that is radiated from the infrared light source 30 to a living body; and a light receiving element array 50H, which includes a plurality of light receiving elements for receiving light that is radiated from the living body. The infrared light source 30, transmission light quantity control element array 40, and light receiving element array 50H are positioned on the same side of the living body. A microcomputer 20 controls the transmission light quantity control element array 40 to combine a first image, which is obtained from the living body when one region of the living body is radiated with light transmitted from the infrared light source 30, with a second image, which is obtained when another region of the living body is radiated, and identifies a person in accordance with the combined image.

Claims

1. A personal identification device comprising:

an infrared light source;

a transmission light quantity control element array provided by a plurality of light transmission control elements for exercising control to transmit or block light radiated from said infrared light source to a living body; and

a light receiving element array provided by a plurality of light receiving elements for receiving light radiated from the living body;

wherein said infrared light source, said transmission light quantity control element array, and said light receiving element array are positioned on the same side of the living body.

2. The personal identification device according to claim 1, further comprising:

control identification means for identifying a person in accordance with a combined image that is obtained by combining a first image with a second image,

wherein said first image is obtained when said light receiving element array acquires light containing internal biometric feature information that is derived from the living body when said transmission light quantity control element array is controlled to radiate one region of the living body with light transmitted from said infrared light source; and

wherein said second image is obtained when said light receiving element array acquires light containing internal biometric feature information that is derived from the living body when said transmission light quantity control element array is controlled to radiate another region of the living body with light transmitted from said infrared light source.

3. The personal identification device according to claim 1, wherein said transmission light quantity control element array is made of a liquid-crystal material.

4. The personal identification device according to claim 1, wherein said transmission light quantity control element array and said light receiving element array are formed on a single transparent substrate.

5. The personal identification device according to claim 1, wherein an optical element is positioned toward a light receiving surface of said light receiving element array to permit the transmission of only a light component that is vertically incident on said light receiving surface.

6. The personal identification device according to claim 1, wherein at least said infrared light source, said transmission light quantity control element array, and said light receiving element array have a curved surface shape.

7. The personal identification device according to claim 1, wherein said infrared light source includes a plurality of infrared light sources;

and wherein some of the plurality of infrared light sources illuminate in accordance with a region radiated by said transmission light quantity control element array.

8. The personal identification device according to claim 7, wherein a light shielding plate is positioned between adjacent pairs of the plurality of infrared light sources.

9. The personal identification device according to claim 1, further comprising:

a light absorber, which is positioned in a direction in which no light is radiated from said infrared light source.