发明授权
- 专利标题: Finding device of variable magnification
- 专利标题(中): 寻找可变放大倍数的装置
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申请号: US881818申请日: 1986-07-03
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公开(公告)号: US4779969A公开(公告)日: 1988-10-25
- 发明人: Yasuhisa Sato , Shinya Yomogizawa
- 申请人: Yasuhisa Sato , Shinya Yomogizawa
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 优先权: JPX60-146172 19850703
- 主分类号: G02B25/00
- IPC分类号: G02B25/00 ; G02B15/14 ; G02B15/177 ; G02B23/14 ; G03B13/06 ; G03B13/12 ; G02B23/00 ; G02B15/15
摘要:
A variable magnification finder including from front to rear, a first lens unit of negative power, a second lens unit of positive power and a third lens unit of positive power, these three units constituting an objective lens of positive overall power, followed by an eyepiece lens of positive power, wherein a finder image formed by the first and second units near the third lens unit is observed by the eyepiece lens, and, with the other lens units being held stationary, the second lens unit is axially moved to vary the finder magnification.
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