Method and apparatus for automatic scanning of fingerprints
First Claim
1. Method for automatic scanning of fingerprints by optical scanning of the fingerprint side of a finger, characterised in that the finger is moved along a scanning surface while measuring the rate of movement of the finger in relation to the scanning surface and in such a manner that by contact between the finger and surface there is formed an optical papillary pattern corresponding to a fingerprint whereupon the pattern is scanned when passing a scanning area and is converted into an electrical signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for automatic scanning of a fingerprint by optical scanning of the fingerprint side (2) of a finger (1) comprises a scanning surface (3) with a measuring means (5) for the rate of movement of the finger in relation to the scanning surface, and with a scanning area (4), a lighting means (6), an optical system (7,8) and an electrical/optical scanning means (9) giving an electrical signal (A) as a function of the fingerprint when the finger is moved in contact with the scanning surface (3) in the direction of the arrow.
The scanning is undertaken by line scanning along the scanning line (4) in that the scanning line is imaged onto the active part of the scanning means (9). The active part consists for example of a number of substantially punctiform photodiodes (10) which are coupled in the electrical circuit and receives control signals (B) so that the photodiodes are scanned successively.
142 Citations
10 Claims
- 1. Method for automatic scanning of fingerprints by optical scanning of the fingerprint side of a finger, characterised in that the finger is moved along a scanning surface while measuring the rate of movement of the finger in relation to the scanning surface and in such a manner that by contact between the finger and surface there is formed an optical papillary pattern corresponding to a fingerprint whereupon the pattern is scanned when passing a scanning area and is converted into an electrical signal.
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6. An apparatus for automatic scanning of fingerprints by optical scanning of the fingerprint side of a finger comprising:
- a scanning surface having means for measuring the rate of movement of the finger across said surface, said scanning surface having a scanning area thereon which includes scanning means for illuminating said area and means for detecting illumination reflected from said area to generate an electrical signal as a function of said reflected light.
- View Dependent Claims (7, 8, 9, 10)
Specification