Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-09-21
1992-09-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25022711, 356 71, 382 4, G06K 500
Patent
active
051461021
ABSTRACT:
A fingerprint image input apparatus for optically detecting ridges of a skin surface of a finger and inputting a detected signal to various control units, includes a transparent member having a lower surface and an upper surface on which the finger subjected to fingerprint detection is pressed, a light source for emitting light from said lower surface to said upper surface of said transparent member, a photosensor for detecting light reflected or scattered from said upper surface of said transparent member, and means, inserted midway along an optical path from said light source to said photosensor, for linearly (in a predetermined direction) focusing light incident on said photosensor, wherein the fingerprint input apparatus further includes another transparent member formed so that the upper surface of the transparent member on which the finger is pressed serves as a light scattering plane with respect to a wavelength of the light.
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Hanari Jun
Higuchi Yoshinori
Kabushiki Kaisha Toshiba
Lee John R.
Nelms David C.
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