Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1990-03-14
1991-07-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
25022731, 356 71, G06K 500
Patent
active
050346164
ABSTRACT:
For automatic recognition of the authenticity of items in sheet form such as bank notes, for example in an automatic service machine, the transparency of each bank note is examined in predetermined spectral ranges. The measuring system is arranged between units of a transport system and, in a passage opening formed from a collector and a diffuser, produces a narrow read-out light beam which extends transversely over a scanning plane. The bank note is conveyed through the read-out light beam, and the light which shines through the bank note in the read-out area is collected in the collector and passed to a photosensitive detector. An evaluation device forms a single measurement value in respect of transparency in the spectral range for each of the successively scanned read-out areas, and compares the measurement values of the bank note being tested with pattern signals stored in a memory of the evaluation device.
REFERENCES:
patent: 3606941 (1971-09-01), Bayha
patent: 3761876 (1973-10-01), Flaherty et al.
patent: 3922557 (1975-11-01), Carnes, Jr.
patent: 4056731 (1977-11-01), Bayha
patent: 4204765 (1980-05-01), Iannadrea et al.
patent: 4319137 (1982-03-01), Nakamura et al.
patent: 4736099 (1988-04-01), Zelinka
patent: 4881268 (1989-11-01), Uchida et al.
patent: 4922109 (1990-05-01), Bercovitz et al.
Allen Stephone
Landis & Gyr Betriebs AG
Nelms David C.
LandOfFree
Device for optically scanning sheet-like documents does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for optically scanning sheet-like documents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for optically scanning sheet-like documents will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-434036