发明名称 |
Finder system |
摘要 |
The disclosed finder system includes, from front to rear, a first objective lens of negative power, an optical member having a half-mirror, an eyepiece of positive power and a viewfinder frame arranged near the eyepiece to be observed by the eyepiece with the aid of a reflection from the half-mirror. The finder system satisfies the condition 0.2<d/D<0.6 where D is the air separation between the first objective lens and the eyepiece lens and d is the air separation between the optical member and the eyepiece lens. Thus the first objective lens is exchangeable for a second objective lens of different power from that of the first objective lens to change the magnification of the finder system.
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申请公布号 |
US4595270(A) |
申请公布日期 |
1986.06.17 |
申请号 |
US19840603197 |
申请日期 |
1984.04.23 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
YAMADA, YASUYUKI;FUJIBAYASHI, KAZUO;SATO, YASUHISA;YOKOTA, HIDEO |
分类号 |
G03B13/12;G02B13/18;G02B13/22;G02B15/06;G02B25/00;G03B13/26;(IPC1-7):G03B13/10 |
主分类号 |
G03B13/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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