Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1998-03-20
2000-10-03
Lee, John R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022731, 25022732, 356 71, G01B 910
Patent
active
06127674&
ABSTRACT:
There is provided an uneven-surface data input apparatus capable of obtaining a fingerprint image which is seldom distorted, in which it is unnecessary to conduct image processing when the fingerprint image is inputted. The uneven-surface data detection apparatus comprises: a light source 10; a transparent base 11 in which light sent from the light source can be transmitted, having an uneven pattern input surface 11a with which an uneven-surface 12a, 12b to be detected comes into contact, also having a function in which light reflected on a projecting surface coming into contact with the input surface and light reflected on a recess surface are separated from each other when the uneven-surface is irradiated with light on the input surface; an optical path length compensating prism 17 on which light emergent from the transparent base is incident so as to compensate for a difference in the optical path length; an optical system 13, 14, 15 for forming an image by light emergent from the optical path length compensating prism, the optical system being arranged on the optical axis at the rear of the optical path length compensating prism; and an image sensor 16 arranged at an image forming position so that optical data of the uneven-surface focused by the optical system can be recorded.
REFERENCES:
patent: 4924085 (1990-05-01), Kato et al.
patent: 5596454 (1997-01-01), Hebert
patent: 5619586 (1997-04-01), Sibbald
patent: 5900993 (1999-05-01), Betensky
Igaki et al., Real-time fingerprint sensor using a hologram, Applied Optics, vol. 31 No. 11, pp. 1794-1802, Apr. 10, 1992.
Fujii Yusaku
Honma Kouji
Shinzaki Takashi
Yokoyama Ken
Fujitsu Limited
Lee John R.
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