Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1995-06-07
1999-08-24
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
356 71, G06K 500
Patent
active
059427612
ABSTRACT:
A fingerprint reading modular device capable of extracting and accurately reproducing and enhancing the ridge pattern on the skin of a fingertip is provided. A narrow illumination source spanning the width of the device is focused onto a movable glass or transparent platen, producing reflected rays containing fingerprint information, as the finger is placed on this platen. Reflected rays are focused by a Selfoc optic fiber lens array onto a linear array of solid state reading elements which convert the image of the fingerprint to electrical signals, producing a digital image for each line of information. The movable transparent platen has an initial position and a terminal position, such that the method of scanning begins with the finger pressed against the platen in its initial position and pushed until the platen reaches its terminal position, whereby the solid state elements read multiple lines of the finger as it moves towards the terminal position.
REFERENCES:
patent: 4544267 (1985-10-01), Schiller
patent: 5446290 (1995-08-01), Fujieda et al.
patent: 5448649 (1995-09-01), Chen et al.
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