发明授权
- 专利标题: Laser actuated keyboard system
- 专利标题(中): 激光键盘系统
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申请号: US958978申请日: 1997-10-28
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公开(公告)号: US6097373A公开(公告)日: 2000-08-01
- 发明人: Thomas Jakobs
- 申请人: Thomas Jakobs
- 申请人地址: AR Alma
- 专利权人: InvoTek Corporation
- 当前专利权人: InvoTek Corporation
- 当前专利权人地址: AR Alma
- 主分类号: G06F3/038
- IPC分类号: G06F3/038 ; G06F3/042 ; G09B21/02 ; G09G5/00
摘要:
A laser actuated keyboard system (10) includes a laser pointer (12) mounted on an adjustable headband (14) for directing a collimated beam (16) onto a laser keyboard (18) defined by an array of photosensors (58) that are intended to be illuminated by the user-targeted beam (16). During a laser acquisition mode, the laser pointer (12) output is controlled to provide a relatively retina-safe output and during the captured signal mode, the laser pointer (12) output is controlled to provide a higher-power mode sufficient to be easily seen. During the higher-power mode, the laser pointer (12) is modulated at a selected frequency to assist the laser keyboard (18) in discriminating against common background light. A successful keypress is declared when the beam (16) illuminates a targeted area for a selected percentage of a pre-determined dwell period.
公开/授权文献
- US4278884A Method and apparatus for xeroradiography 公开/授权日:1981-07-14
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