发明授权
- 专利标题: Stack type optical disc apparatus, sealed and separate type optical head therefor and optical disc medium
- 专利标题(中): 堆叠式光盘装置,密封分离型光头及光盘介质
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申请号: US641309申请日: 1991-01-15
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公开(公告)号: US5235591A公开(公告)日: 1993-08-10
- 发明人: Shigeru Nakamura , Eiichi Seya , Seiichi Mita , Masuo Kasai , Masahiro Ojima , Hiroshi Yasuoka , Motoyasu Terao , Yoshinori Miyamura , Takeshi Nakao , Kiyoshi Matsumoto , Yoshihiro Hamakawa
- 申请人: Shigeru Nakamura , Eiichi Seya , Seiichi Mita , Masuo Kasai , Masahiro Ojima , Hiroshi Yasuoka , Motoyasu Terao , Yoshinori Miyamura , Takeshi Nakao , Kiyoshi Matsumoto , Yoshihiro Hamakawa
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX2-008236 19900119; JPX2-068348 19900320
- 主分类号: G11B7/12
- IPC分类号: G11B7/12 ; G11B7/14 ; G11B33/14
摘要:
A separation type optical head according to the present invention includes at least a light source portion for emitting collimated beams, a focusing device (a focusing lens) for focusing the collimated beams onto an information recording surface of an optical disc medium, a focal point control mechanism for the position of the spot on the information recording surface, and a photo-detection portion for receiving beams reflected by the information recording surface. The structure is divided into a fixed portion including the light source portion and the photo-detection portion and a movable portion including the focusing device (focusing lens) and the focal point control mechanism. At least the movable portion of the separation type optical head is movably accommodated n a frame (sealing case) for the optical head so as to prevent irregular vibrations of the movable portion due to high speed air flows or turbulence. Furthermore, a focal point control mechanism of an air float type may be employed in the movable portion of the separation type optical head so as to actively utilize the high speed air flow generated due to the rotation of the disc medium to perform a rough adjustment of the focal point of the focusing device.