| 摘要 |
<p>A self-contained optical scanning unit for use in a compact, hand-held bar code scanner includes a motor driven hollow drive shaft (28) through which is projected a laser light beam from a laser source (34) positioned adjacent one end of the drive shaft. Mounted on the other end of the drive shaft (28) is an optical transceiver (42) which includes a deflecting portion (44) which deflects the laser light beam outwardly towards a ring of mirrors (40) which form a scanning pattern for scanning coded indicia, and a collection portion (46) which collects the reflected light beams from the coded indicia and directs the light beams at a detecting member (56). The collection portion (46) of the transceiver (42) is orientated obliquely across the spin axis (60) of the drive shaft (28) while the deflection portion (44) is orientated obliquely to the spin axis (60) and to the face of the collection portion (46). The detection member (56) is located on the spin axis (60) between the transceiver (42) and the coded indicia. In a second embodiment, the optical transceiver (67) directs the light. beam directly to the coded indicia and directs the collected light to a plane mirror (130) for reflection to a detection member (132) located off the spin axis.</p> |
