Optics: measuring and testing – Document pattern analysis or verification
Patent
1995-01-31
1998-09-22
Font, Frank G.
Optics: measuring and testing
Document pattern analysis or verification
382116, 382117, 34082534, 3408253, 34082531, 348156, 348161, 25022711, 2502272, G06F 704, G06K 974, G01J 104, G02B 606
Patent
active
058122524
ABSTRACT:
At a first end of an optic-fiber prism assembly are fiber terminations to contact a relieved surface, e.g. finger (stabilized by a handgrip). In a region where fiber diameter is essentially constant with longitudinal position, light enters the prism, crosses the fibers and enters individual fibers through their sidewalls, lighting the terminations. To allow crosslighting of the assembly, the fiber-optic numerical aperture (NA) is small: preferably not exceeding one-half. Due to fingerprint etc. detail, fractions of light pass along the fibers; at the assembly second end a detector responds with an electrical-signal array based on the surface relief. The signals are processed to check finger etc. identity and applied to control access to a personal weapon, other equipment, facilities, data, or a money service. FTIR ("frustrated total internal reflection") bright- and dark-field versions have various benefits. For use of small, low-cost detectors--and/or internal-mirror versions that light the finger straight-on--the assembly has a separate element, e.g. a high-NA fiber-optic taper with extramural absorption or "EMA" material (no entry light crosses it). For a weapon, a unitary antibypassing module (which matches a weapon port, and must be present) holds part of the access-control and firing systems. Bullets etc. fire only on a special signal from the module.
REFERENCES:
patent: 3947128 (1976-03-01), Weinberger
patent: 4003152 (1977-01-01), Barker
patent: 4467545 (1984-08-01), Shaw
patent: 4728186 (1988-03-01), Eguchi
patent: 4783167 (1988-11-01), Schiller
patent: 4785171 (1988-11-01), Dowling
patent: 4805223 (1989-02-01), Denyer
patent: 4932776 (1990-06-01), Dowling
patent: 5109427 (1992-04-01), Yang
patent: 5210588 (1993-05-01), Lee
patent: 5233404 (1993-08-01), Lougheed
patent: 5426296 (1995-06-01), Shikai et al.
patent: 5546471 (1996-08-01), Merjanian
Bowker J. Kent
Lubard Stephen C.
Areté Associates
Font Frank G.
Lippman Peter I.
Stafira Michael P.
LandOfFree
Fingerprint--Acquisition apparatus for access control; personal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fingerprint--Acquisition apparatus for access control; personal , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fingerprint--Acquisition apparatus for access control; personal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1627643