AUTOMATIC FOCUSING DEVICE OF CAMERA
申请(专利)号： JP19840048187
专利号： JPS60194416A 主分类号： G03B13/36
申请权利人： KOUWA KK 公开国代码： JP 优先权国家： JP
摘 要：
PURPOSE:To attain always stable focusing operation in accordance with environmental temperature by forming a cam follower which is brought into contact with a focus cam by a material having a high coefficient of thermal expansion and correcting the position of a photodetecting element on the basis of temperature
change. CONSTITUTION:The focus cam 5 for displacing photometric
photodetecting element 11 is fixed to a focus lens barrel 4 in a direction
approximately rectangular to the optical axis X1 of an optical system. The cam follower 16 fixing the photodetecting
element 11 at its one end and abutting on the cam 5 at the other end is formed by a material having a high coefficient of thermal expansion. When the
environmental temperature is turned to a high level, the lens barrel is expanded and this device forms its image correctly and a focusing position through a lens driving device because the cam follower 16 is expanded with the temperature and
申请日： 1984-03-15 公开公告日： 1985-10-02
分类号： G03B13/36;
G02B7/02; G02B7/32; G03B3/00 发明设计人： FUJITA AKIHIRO 申请国代码： JP
优先权： 19840315 JP
4818784
摘 要 附 图：
corrects the position of the photodetecting element 11 although an ordinary device forms its image on a point P'. Even if the environmental temperature is changed, the device is made to correspond to the temperature change and always correct focusing can be attained. 主权项：
权 利 要 求 说 明 书
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AUTOMATIC FOCUSING DEVICE OF CAMERA
