发明名称 |
In-focus detecting device |
摘要 |
A focus lens protecting and in-focus detecting device has light receiving circuit and a comparator for comparing the output of said light receiving elements with a reference potential. A switch network is controlled by the output of the comparator to supply signals to a focus control amplifier from the light receiving circuit.
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申请公布号 |
US4286147(A) |
申请公布日期 |
1981.08.25 |
申请号 |
US19790058647 |
申请日期 |
1979.07.19 |
申请人 |
UNIVERSAL PIONEER CORPORATION |
发明人 |
TSUBOI, HIROAKI;HOSAKA, TOSHIHIKO |
分类号 |
G02B7/28;G05D3/16;G11B7/085;G11B7/09;(IPC1-7):G01J1/20 |
主分类号 |
G02B7/28 |
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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