Fingerprint indentifying system

• US 20100208952A1
• Filed: 08/05/2009
• Published: 08/19/2010
• Est. Priority Date: 02/19/2009
• Status: Active Grant

• Current Assignee: Gingy Technology Inc.
• Original Assignee: Gingy Technology Inc.
• Inventors: Wu, Jew-Chieh
• Granted Patent: US 8,391,569 B2
• Time in Patent Office: Days
• US Class Current: 382/124
• CPC Class Codes: G06V 40/1324 by using geometrical optics, e.g. using prisms G06V40/1312 takes precedence

Abstract

A fingerprint identifying system includes a light-transmissive finger press plate, a light source, a beam-splitter, and an image-capturing unit. The light-transmissive finger press plate has a top face adapted to contact a finger. The light source emits a light beam adapted to interact with the finger on the top face. The beam-splitter is disposed below the finger press plate and splits the light beam into a transmission light beam and a reflection light beam. The image-capturing unit receives at least one of the transmission light beam and the reflection light beam from the beam-splitter.

Claims

1. A fingerprint identifying system comprising:

a light-transmissive finger press plate having a top face adapted to contact a finger;

a light source emitting a light beam adapted to interact with the finger on said top face;

a beam-splitter disposed below said finger press plate and splitting the light beam into a transmission light beam and a reflection light beam; and

an image-capturing unit receiving at least one of the transmission light beam and the reflection light beam from said beam-splitter.

2. The fingerprint identifying system as claimed in claim 1, wherein said image-capturing unit is disposed above said beam-splitter, said beam-splitter sending said reflection light beam to said image-capturing unit.

3. The fingerprint identifying system as claimed in claim 2, wherein said light source is disposed below said beam-splitter, said light beam of said light source being sent to said finger press plate through said beam-splitter and re-directed back to said beam-splitter, said reflection light beam received by said image-capturing unit being a secondary reflection light beam from said beam-splitter.

4. The fingerprint identifying system as claimed in claim 2, wherein said light source is disposed above said finger press plate, said light beam of said light source being an invisible light beam which is sent downwardly to said finger press plate and then to said beam-splitter, said reflection light beam received by said image-capturing unit being a primary reflection light beam from said beam-splitter.

5. The fingerprint identifying system as claimed in claim 1, wherein said image-capturing unit and said light source are disposed below said beam-splitter, said light beam of said light source being directed to said finger press plate through said beam-splitter and then re-directed back to said beam-splitter, said transmission light beam received by said image-capturing unit being a secondary transmission light beam from said beam-splitter.

6. The fingerprint identifying system as claimed in claim 5, wherein said light source includes two light units disposed on two sides of said image-capturing unit.

7. The fingerprint identifying system as claimed in claim 1, further comprising a reflecting member disposed above said beam-splitter, said image-capturing unit and said light source being disposed below said beam-splitter, said image-capturing unit being disposed on one side of said light source, said reflecting member and said image-capturing unit being substantially aligned in a vertical direction, said beam-splitter sending a second reflection light beam to said reflecting unit, said reflection light beam received by said image-capturing unit being a tertiary reflection light beam from said reflecting member.

8. The fingerprint identifying system as claimed in claim 1, wherein said finger press plate includes a microstructure layer.

9. The fingerprint identifying system as claimed in claim 8, wherein said microstructure layer is provided on a bottom face of said light-transmissive finger press plate.

10. The fingerprint identifying system as claimed in claim 8, wherein said microstructure layer includes a plurality of microstructures.

11. The fingerprint identifying system as claimed in claim 10, wherein said microstructures include indentations and protrusions.

12. The fingerprint identifying system as claimed in claim 11, wherein said indentations and protrusions are of V-shaped cross-section, trapezoid cross-section, or semi-circular cross-section.

13. The fingerprint identifying system as claimed in claim 1, wherein said beam-splitter has a transmittance ranging from 10% to 90% and a reflectance ranging from 90% to 10%.