Uneven-surface data detection apparatus

Details Uneven-surface data detection apparatus Uneven-surface data detection apparatus

1989-06-23

1990-05-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 71, 25022731, 25022732, H01J 516

Patent

active

049240854

ABSTRACT:
An uneven surface data detection apparatus for detecting an uneven surface, such as a human finger, having projected portions and recessed portions. A transparent base having upper and lower surfaces and an upper surface defining an uneven surface contact portion is provided, and a light is incident on the uneven surface so that the light derived from the recess portions enters to the transparent base and comes out thereof. However, a part of the light derived from the projected portions is totally reflected at least one time by the lower opposite surface and focussing lens is integrally formed on the transparent base so that the totally reflected light is drawn out of transparent base and enters to an image sensor.

REFERENCES:
patent: 3975711 (1976-08-01), McMahon
patent: 4684802 (1987-08-01), Hakenewerth
patent: 4728186 (1988-03-01), Eguchi et al.
patent: 4785171 (1988-11-01), Dowling, Jr. et al.

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