发明授权
- 专利标题: Optical scanner with segmented collection mirror
- 专利标题(中): 具有分段收集镜的光学扫描仪
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申请号: US09047011申请日: 1998-03-24
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公开(公告)号: US06382513B1公开(公告)日: 2002-05-07
- 发明人: Paul Dvorkis , Edward Barkan , Howard Shepard , David Tsi , Mark Drzymala , Harold Charych , Raj Bridgelall
- 申请人: Paul Dvorkis , Edward Barkan , Howard Shepard , David Tsi , Mark Drzymala , Harold Charych , Raj Bridgelall
- 主分类号: G02B2600
- IPC分类号: G02B2600
摘要:
A multiple working range scanner includes a collection mirror which is segmented, with each segment having differing optical properties, such as focal length, optical axis, and so on. Differing segments or combinations of segments deal with reflected light received at differing working ranges, and direct it to a photodetector. In another embodiment, beam shaping may be applied to an astigmatic laser beam, for example by means of a part-concave mirror, to create an x waist in the beam which is further from the scanner than the y waist. This provides enhanced performance when the scanner is used on a bar code symbol which is not accurately aligned. In order to provide improved optical alignment within a bar code scanner, the collection mirror may be adjustable both in the x direction and in the y direction.
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