发明名称 |
View finder of variable magnification |
摘要 |
A view finder having, from front to rear, a first lens unit of negative power, a second lens unit of positive power and a third lens unit of negative power, the second lens unit being moved axially forward as the magnification varies from the smallest to the largest value, while the first lens unit is moved to compensate for the diopter shift resulting from the variation of the magnification.
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申请公布号 |
US4757336(A) |
申请公布日期 |
1988.07.12 |
申请号 |
US19860820626 |
申请日期 |
1986.01.21 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
NAKAYAMA, HIROKI;SATO, YASUHISA;OIZUMI, KOUJI;YAMADA, YASUYUKI |
分类号 |
G02B25/00;G02B15/16;G02B15/177;G02B23/14;G03B13/12;(IPC1-7):G03B13/02;G02B15/00 |
主分类号 |
G02B25/00 |
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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