发明名称 |
Zoom lens driving apparatus. |
摘要 |
<p>A zoom lens driving apparatus always detects a position (d;) of an image magnification varying lens section, and drives the image magnification varying lens section in accordance with a preset relationship between the position of the image magnification varying lens section and a zoom driving speed in such a manner that the driving speed becomes higher on one side where the focal length (fi) of the zoom lens corresponding to the position of the image magnification varying lens section is smaller than on another side where the focal length is large. Accordingly, the amount of focal shift, which in the zoom lens of the inner focusing system would otherwise abruptly increase with increasing focal length, is remarkably suppressed, so that an auto focus adjusting mechanism or a focus correcting device effective during zooming, provided in the zoom lens, can function satisfactorily as to follow the focal shift of the zoom lens, whereby the lens control of superior response can always be achieved.</p> |
申请公布号 |
EP0323237(A2) |
申请公布日期 |
1989.07.05 |
申请号 |
EP19880312372 |
申请日期 |
1988.12.28 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
HIRAO, YOSHIAKI;KUGA, RYUICHIRO;YONEYAMA, MASAYUKI;ONO, SHUSUKE |
分类号 |
G02B7/08;G02B7/28;G02B7/10 |
主分类号 |
G02B7/08 |
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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