发明授权
US4235507A Optical system to condense light from a semiconductor laser into a
circular spot
失效
用于将来自半导体激光器的光聚合成圆点的光学系统
- 专利标题： Optical system to condense light from a semiconductor laser into a circular spot
- 专利标题（中）： 用于将来自半导体激光器的光聚合成圆点的光学系统
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申请号： US937982申请日： 1978-08-30
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公开(公告)号： US4235507A公开(公告)日： 1980-11-25
- 发明人: Keiji Kataoka , Seiji Yonezawa
- 申请人： Keiji Kataoka , Seiji Yonezawa
- 申请人地址： JPX
- 专利权人： Hitachi, Ltd.
- 当前专利权人： Hitachi, Ltd.
- 当前专利权人地址： JPX
- 优先权： JPX52-111399 19770916; JPX53-40333 19780407
- 主分类号： G02B27/09
- IPC分类号： G02B27/09 ; G11B7/135 ; G02B21/00
摘要：
An optical system has an objective lens for focussing on a dotted information carrying video disc the light emitted from a light source of semiconductor laser whose radiant region has different longitudinal and lateral dimensions, and a coupling lens disposed between the objective lens and the laser source for condensing the light from the laser source. The coupling lens has a magnification factor of not greater than 7.
公开/授权文献
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