发明授权
- 专利标题: Release type electromagnetic device for camera
- 专利标题(中): 释放型电磁装置
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申请号: US847744申请日: 1977-11-02
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公开(公告)号: US4240055A公开(公告)日: 1980-12-16
- 发明人: Masami Shimizu , Teiji Hashimoto , Hideaki Miyakawa , Masanori Uchidoi , Hiroshi Aizawa , Tadashi Ito
- 申请人: Masami Shimizu , Teiji Hashimoto , Hideaki Miyakawa , Masanori Uchidoi , Hiroshi Aizawa , Tadashi Ito
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX51-137117 19761115
- 主分类号: G03B17/38
- IPC分类号: G03B17/38 ; G03B9/08 ; G03B9/62 ; H01F7/04 ; H01F7/08 ; H01H71/32
摘要:
In an electromagnetic release for a camera a normally de-energized electromagnet is coupled with unitarally joined elongated pole pieces, and when energized, generates a magnetic flux opposing the magnetic flux of a permanent magnet. A moveable, magnetizable armature adjacent corresponding ends of the pole pieces is normally attracted by the pole pieces as a result of the flux of the permanent magnet when the electromagnet is deenergized. The permanent magnet is positioned between the pole pieces. A spring biases the armature to disengage it from the faces of the pole pieces.
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