发明授权
- 专利标题: Electronically-controlled mechanically-damped off-resonant light beam scanning mechanism and code symbol readers employing the same
- 专利标题(中): 电子控制的机械阻尼非共振光束扫描机构和采用其的代码符号读取器
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申请号: US08931691申请日: 1997-09-16
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公开(公告)号: US06227450B1公开(公告)日: 2001-05-08
- 发明人: Robert E. Blake , Charles A. Naylor , Stephen J. Colavito , Thomas Amundsen , Thomas Carullo , C. Harry Knowles
- 申请人: Robert E. Blake , Charles A. Naylor , Stephen J. Colavito , Thomas Amundsen , Thomas Carullo , C. Harry Knowles
- 主分类号: G06K710
- IPC分类号: G06K710
摘要:
Disclosed is laser beam scanning apparatus in the form of an electronically-controlled mechanically-damped off-resonant laser beam scanning mechanism. The scanning mechanism comprises an etched scanning element having a small flexible gap region of closely-controlled dimensions disposed between an anchored base portion and a laser beam deflecting portion The light beam deflecting portion supports a permanent magnet and a light beam deflecting element (e.g., mirror or hologram). A reversible magnetic force field producing device (e.g., an electromagnet) is placed in close proximity with the permanent magnet so that it may be forcibly driven into oscillation in response to electrical current flowing through the electromagnet. The resonant frequency of oscillation of the laser beam deflecting portion relative to the anchored base portion is determined by the closely controlled dimensions of the flexible gap region set during manufacture. The steady-state frequency of oscillation of the laser beam deflecting portion is determined by the frequency of polarity reversal of the electromagnet, which is electronically controlled by the polarity of electrical current supplied thereto.
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