Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-09-26
1996-07-02
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
235462, 359213, H01J 314
Patent
active
055324800
ABSTRACT:
A bar code reader including a dynamic damper for an oscillating mirror assembly is disclosed herein. The reader includes a frame which supports a light source for producing scanning light, and a transducer for receiving scanning light reflected from a bar code being read by the reader. The light produced by the light source is scanned over the bar code by an oscillator assembly including a carrier defining a rotational axis, a light reflector fastened to the carrier, and a spring assembly fastened to the carrier and the frame to resiliently support the carrier for oscillation about the rotational axis. A damper fastened to the frame and slidably engaged with the carrier is provided to inhibit oscillation of the carrier perpendicular to the rotational axis. Such undesirable oscillation is typically caused by forces external to the scanner such as jarring of a structure supporting the scanner.
REFERENCES:
patent: 3891299 (1975-06-01), Rushing
patent: 4919500 (1990-04-01), Paulsen
patent: 5015831 (1991-05-01), Eastman et al.
patent: 5097356 (1992-03-01), Paulsen
patent: 5115120 (1992-05-01), Eastman
patent: 5373148 (1994-12-01), Dvorkis et al.
Allen-Bradley Company Inc.
Horn John J.
Le Que T.
Miller John M.
Morrow James G.
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