Registers – Coded record sensors – Particular sensor structure
Patent
1986-05-29
1989-06-27
Faber, Alan
Registers
Coded record sensors
Particular sensor structure
235462, 235472, G06K 710
Patent
active
048432229
ABSTRACT:
A scanning bar code reader which includes a lens and a multi-zone detector. The zones have differing distances from the principal plane of the lens so that one zone will have on it a better focussed image of the bar code symbol than do the others. The zones are electronically scanned. The lens includes a plurality of regions of differing focal lengths and/or different principal planes which promote a magnification which is not directly related to distance of the symbol from the reader. A stop restricts the rays reaching a particular zone of the detector to those which have been refracted by the lens region which gives the best focussed image on the particular zone from a symbol at a predetermined distance.
REFERENCES:
patent: 2811081 (1957-10-01), Praeger
patent: 3876841 (1975-04-01), Kramer et al.
patent: 4408120 (1983-10-01), Hara et al.
patent: 4501493 (1985-02-01), Kubota
patent: 4560862 (1985-12-01), Eastman et al.
patent: 4612437 (1986-09-01), Ohsato
patent: 4678288 (1987-07-01), Lonsdale et al.
Eastman Kodak Company
Faber Alan
Turner John B.
Weinhardt Robert A.
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