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1. 发明授权

US3890625A Long-time exposure apparatus for camera 失效
标题翻译：相机长时间曝光装置
公开(公告)号：US3890625A
公开(公告)日：1975-06-17
申请号：US39081873
申请日：1973-08-23
申请人： MINOLTA CAMERA KK
发明人： YOSHIO KURAMOTO , TOSHIO KOBORI
IPC分类号： G03B9/58 , G03B7/02
CPC分类号： G03B9/58
摘要： An apparatus includes an exposure time setting member for setting an exposure time within an ordinary range and a long-time exposure setting member for setting a longer exposure time. Longtime exposures can be set only when the exposure time setting member is set in a specified position. The setting members are so adapted that only when at least one of them is set in the specified position, the other is rendered operable. The setting members operate an exposure time control element of an exposure time control electric circuit for controlling the exposure time in accordance with the time constant of a delay circuit to vary the time constant. For setting long-time exposures, the time constant is increased by an increased capacity of capacitor.
摘要翻译：一种装置包括用于设定普通范围内的曝光时间的曝光时间设定部件和用于设定较长曝光时间的长时间曝光设定部件。只有当曝光时间设定部件设定在指定位置时，才能设定长时间曝光。设置构件被适配成只有当至少其中一个设置在指定位置时，另一个可操作。设置构件操作曝光时间控制电路的曝光时间控制元件，用于根据延迟电路的时间常数控制曝光时间，以改变时间常数。为了设置长时间曝光，时间常数由于电容器的容量增加而增加。

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