Counter rotating optical scanning unit with Fresnel reflection f

Details Counter rotating optical scanning unit with Fresnel reflection f Counter rotating optical scanning unit with Fresnel reflection f

1992-02-10

1993-03-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250566, 259216, 235467, H01J 314

Patent

active

051966964

ABSTRACT:
An optical scanning unit which employs a mirrored spinner and a plurality of pattern mirrors that counter rotate to produce an omnidirectional scan pattern having a predetermined depth of field. The pattern mirrors are mounted within a drum which rotates freely within the scanner housing. The optical scanning unit employs a variable drive gear mechanism to counter rotate the spinner and pattern mirrors using a single motor. The optical scanning unit additionally employs a collection filtering system for filtering Fresnel reflections from light reflected from an article having a bar code label to be scanned. A plurality of scanning units may be arranged vertically or horizontally to form a multiple depth-of-field optical scanner.

REFERENCES:
patent: 3602571 (1971-08-01), Norris, Jr.
patent: 3632871 (1972-01-01), Watkins et al.
patent: 4795224 (1989-01-01), Goto
patent: 4870274 (1989-09-01), Herbert et al.
patent: 4971410 (1990-11-01), Wike, Jr. et al.

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