Registers – Coded record sensors – Particular sensor structure
Patent
1986-10-20
1988-12-06
Trafton, David L.
Registers
Coded record sensors
Particular sensor structure
235462, 2502221, G06K 710
Patent
active
047897759
ABSTRACT:
An optical reader control system includes a source of radiant energy mounted above a checkout counter and detecting means mounted adjacent an aperture in the supporting surface of the counter receives the radiant energy to control the operation of the optical reader mounted within the counter for projecting scanning beams through the aperture. One embodiment of the detecting means includes a pair of photodetectors mounted in the supporting surface of the counter on both sides of the aperture for turning the optical reader on and off. A second embodiment includes a single photodetector mounted in the supporting surface upstream of the aperture for turning on the optical reader and a timer operable upon the positioning of a merchandise item over the photodetector for turning off the optical reader after the expiration of a predetermined time period.
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M. Cappa; High Sensitivity, Wide Range Photo-Amplifier; IBM Tech. Discl. Bul., vol. 21, No. 8, Jan. 1979, pp. 3115-3116.
Ferrante Ronald A.
McClain Herbert D.
Hawk Jr. Wilbert
Lavin Richard W.
NCR Corporation
Sessler Jr. Albert L.
Trafton David L.
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