发明授权
- 专利标题: Optical pickup apparatus
- 专利标题(中): 光拾取装置
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申请号: US895511申请日: 1997-07-16
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公开(公告)号: US5870370A公开(公告)日: 1999-02-09
- 发明人: Yoshitaka Takahashi , Hiroshi Akiyama , Masami Emoto
- 申请人: Yoshitaka Takahashi , Hiroshi Akiyama , Masami Emoto
- 申请人地址: JPX Tokyo
- 专利权人: Ricoh Company, Ltd.
- 当前专利权人: Ricoh Company, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX5-237027 19930924; JPX5-245295 19930930; JPX5-270225 19931028
- 主分类号: G11B7/00
- IPC分类号: G11B7/00 ; G11B7/12 ; G11B7/135
摘要:
Small-sized and light-weighted optical pickup apparatus capable of eliminating the effect due to the flaring light rays and performing the signal detection of high reliability is provided.In the apparatus, the quarter-wave (.lambda./4) plate and the reflection-type birefringent prime provided with the deflecting function of deflecting the reflection light rays reflected on the optical information recording medium and the light rays flux separating function of separating the reflected light rays from the outgoing light rays are disposed in the optical path between the semiconductor laser constructing the optical pickup portion and the objective lens, and the light-receiving element for receiving the reflection light rays from the optical information recording medium which are defleced and separated by the reflection-type birefringent prism is disposed on a single (same) substrate together with the semiconductor laser.
公开/授权文献
- US4686711A Eye protection device for welder protection equipment 公开/授权日:1987-08-18