Axially invariant pattern scanning apparatus

Details Axially invariant pattern scanning apparatus Axially invariant pattern scanning apparatus

1991-09-19

1993-01-05

Sikes, William L.

Registers

Coded record sensors

Particular sensor structure

235454, 235462, 235470, 235472, G06K 710

Patent

active

051773473

ABSTRACT:
An optical scanning unit for use in a bar code scanner for scanning a bar code label includes a motor driven hollow drive shaft through which are projected laser light beams from a laser source positioned adjacent one end of the drive shaft. Mounted on the other end of the drive shaft is a deflecting member which includes a first reflecting surface for deflecting the laser light beams outwardly towards a ring of mirrors each of which is located in a plane parallel to the axis of the drive shaft. The light beams deflected from the ring of mirrors are directed towards a second reflecting surface on the deflecting member which surface deflects the received scanning light beams in a direction parallel to the axis of the hollow drive shaft thereby forming a scan pattern comprising a plurality of intersecting scan lines whose center of intersection remains constant as the distance between the deflecting member and the bar code label changes.

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patent: 4971410 (1990-11-01), Wike, Jr. et al.
patent: 5115121 (1992-05-01), Bianco et al.

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