发明授权
- 专利标题： Lens with variable focal length
- 专利标题（中）： 镜头具有可变焦距
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申请号： US649868申请日： 1996-05-13
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公开(公告)号： US5864128A公开(公告)日： 1999-01-26
- 发明人: George A. Plesko
- 申请人： George A. Plesko
- 申请人地址： PA Media
- 专利权人： Geo Labs, Inc.
- 当前专利权人： Geo Labs, Inc.
- 当前专利权人地址： PA Media
- 主分类号： G02B3/14
- IPC分类号： G02B3/14 ; G02B26/10 ; G06K7/10 ; H02K33/16 ; H03K17/94
摘要：
A system and method for scanning a bar code target by continuously varying the focal range of a bar code scanning system. A light source is provided for generating light rays, and a lens is provided for focusing the light rays. The lens has a variable focal length. The focused light rays are scanned across the bar code target with a beam scanner. While the focused light rays are being scanned, the focal length of the lens is continuously varied.
公开/授权文献
- US4536348A Dihydroxyalkane diphosphonic acids 公开/授权日：1985-08-20
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