Fingerprint indentifying system

• US 20100172552A1
• Filed: 06/17/2009
• Published: 07/08/2010
• Est. Priority Date: 01/07/2009
• Status: Active Grant

• Current Assignee: Gingy Technology Inc.
• Original Assignee: Jen-Chieh Wu
• Inventors: Wu, Jen-Chieh
• Granted Patent: US 8,903,140 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: G06V 40/13 Sensors therefor

Abstract

A fingerprint identifying system includes a finger press plate, an image-capturing unit, a light-diffusion member, at least one microstructure layer, and a light source. The light-diffusion member is disposed below the finger press plate and above the image-capturing unit, and has a through hole in alignment with the image-capturing unit. The microstructure layer is disposed on the light-diffusion member. The light source is disposed below the light-diffusion member and around the image-capturing unit.

Claims

1. A fingerprint identifying system comprising:

a finger press plate;

an image-capturing unit;

a light-diffusion member disposed below said finger press plate and above said image-capturing unit, and having a through hole in alignment with said image-capturing unit;

at least one microstructure layer disposed on said light-diffusion member; and

a light source disposed below said light-diffusion member and around said image-capturing unit.

2. The fingerprint identifying system as claimed in claim 1, wherein said microstructure layer includes a plurality of microstructures disposed on top of said light-diffusion member.

3. The fingerprint identifying system as claimed in claim 2, wherein said microstructures include indentations and protrusions.

4. The fingerprint identifying system as claimed in claim 3, wherein said indentations and protrusions are of V-shaped cross-section, trapezoid cross-section, or semi-circular cross-section.

5. The fingerprint identifying system as claimed in claim 1, wherein said microstructure layer faces said finger press plate.

6. The fingerprint identifying system as claimed in claim 5, comprising a pair of said microstructure layers stacked on top of said light-diffusion member in such a manner that said microstructures of one of said microstructure layers are transverse to said microstructures of the other of said microstructure layers.

7. The fingerprint identifying system as claimed in claim 1, wherein said light-diffusion member is tubular, and has a top end connected to said finger press plate, a bottom end extending to said light source and serving as a light entrance end for said light source, an inner periphery confining said through hole, and an outer periphery surrounding said inner periphery, said microstructure layer extending over said outer periphery, said image-capturing unit extending into said through hole.

8. The fingerprint identifying system as claimed in claim 7, further comprising an optical coupler disposed between said bottom end of said light-diffusion member and said light source.

9. The fingerprint identifying system as claimed in claim 7, further comprising a reflective layer disposed on said microstructure layer and spaced from said light-diffusion member by said microstructure layer.