发明名称 |
Autofocus system |
摘要 |
In an autofocus system in which the image definition of an object to be picked up is detected by image sensor means disposed on a light path of an image-forming optical system and converted into electric signals, and the image-forming position of the image-forming optical system is controlled by using the electric signals, a plurality of electric signals representative of image definitions are obtained from a main image sensor and at least one sub-image sensor which are provided at optically different positions on the light path and subjected to a predetermined logical judgement processing to produce a focus control signal. The position of the image-forming optical system is controlled by the focus control signal. When the sub-image sensor is movably supported and the light path length between the image-forming optical system and the sub-image sensor is varied by changing the position of the sub-image sensor, a signal representative of the position of the sub-image sensor is also subjected to a predetermined logical judgement processing and used for controlling the position of the sub-image sensor.
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申请公布号 |
US4414575(A) |
申请公布日期 |
1983.11.08 |
申请号 |
US19810322704 |
申请日期 |
1981.11.18 |
申请人 |
HITACHI DENSHI KABUSHIKI KAISHA |
发明人 |
YAMAMOTO, MANABU;TANAKA, SHUHEI |
分类号 |
G02B7/38;H04N5/232;(IPC1-7):H04N9/28 |
主分类号 |
G02B7/38 |
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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