发明授权
- 专利标题: Apparatus for actuating objective lens
- 专利标题(中): 用于执行物镜的装置
-
申请号: US919317申请日: 1986-10-14
-
公开(公告)号: US4863240A公开(公告)日: 1989-09-05
- 发明人: Atsunobu Nakajima , Seiji Hoshi , Hiroyoshi Yamamoto , Chikara Miyata , Ikuo Nanno , Shigeru Inagaki , Hideo Hoshi
- 申请人: Atsunobu Nakajima , Seiji Hoshi , Hiroyoshi Yamamoto , Chikara Miyata , Ikuo Nanno , Shigeru Inagaki , Hideo Hoshi
- 申请人地址: JPX Tokyo
- 专利权人: Seiko Instruments & Electronics Ltd.
- 当前专利权人: Seiko Instruments & Electronics Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX60-247723 19851105
- 主分类号: G02B7/09
- IPC分类号: G02B7/09 ; G11B7/09 ; H02K41/035
摘要:
An apparatus actuates an objective lens in axial and circumferential directions through annular magnetic gaps which are formed by yokes and a magnet. In order to retain the objective lens in the neutral position in the circumferential direction, two or four magnetic pieces are mounted on a lens mount and disposed near the circumferetial ends of the annular magnetic gaps in which the force caused by the magnetic potential energy in the magnetic gaps acts on the magnetic pieces to pull them back in the direction of the magnetic gaps so that a magnetic spring for retaining the objective lens at the neutral position is formed by the magnetic pieces.