Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1977-04-29
1978-06-06
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
3401463F, 235470, 350 6, 350 7, G06K 710
Patent
active
040938654
ABSTRACT:
A system for scanning a code symbol consisting of a combination of spaced parallel bars affixed to an object for providing coded information related to the object. A flat panel defines a scanning region adjacent the panel for receiving objects having the code symbol. Light transmissive areas in the panel surface define a "double X bar" pattern consisting of a predetermined configuration of five bars, such as shown in the Drawing. A laser beam is sequentially scanned at an acute angle to the panel surface in planes extending through the five bars into the defined scanning region at prescribed angles in relation to a first direction. When a received object containing said code symbol is moved within the defined scanning region from the first direction with the code symbol facing the panel or facing within almost ninety degrees of a second direction, opposite to the first direction, light scanned into the defined scanning region is reflected by the code symbol to a detection system, and the detection system provides an electrical signal indicative of the coded information.
REFERENCES:
patent: 3594578 (1971-07-01), Ohman
patent: 4006343 (1977-02-01), Izura
patent: 4041322 (1977-08-01), Hagosh
National Semiconductor Corporation
Nelms David C.
Tokar Michael J.
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