公开(公告)号：US3747485A

公开(公告)日：1973-07-24

申请号：US3747485D

申请日：1972-08-16

Applicant: ASAHI OPTICAL CO LTD

Inventor： SUZUKI M

IPC: G03B7/20 ,  G03B7/083 ,  G03B7/18 ,  G03B17/18 ,  G03B19/12 ,  G03B7/08 ,  G03B13/22

CPC classification number: G03B7/18 ,  G03B7/083 ,  G03B19/12

Abstract: Controls for cameras adpated to use coupled and non-coupled objectives interchangeably. An electrical circuit is provided for utilizing a variable resistor with a coupled objective and direct light measurement through a stopped-down diaphragm with a noncoupled objective, these different operations being determined by a manually operable switch. In the event that a non-coupled objective is mounted on the camera and this latter manually operable switch is not positioned to directly measure light through the stopped-down diaphragm, the exposure time is the equivalent of a bulb exposure, lasting only until the operator releases a shutter-tripping member.

Abstract translation: 摄像机的控制器可互换使用耦合和非耦合目标。 提供了一种电路，用于利用具有耦合物镜的可变电阻器和通过具有非耦合物镜的停止隔膜的直接光测量，这些不同的操作由手动操作的开关确定。 在非耦合物镜安装在相机上的情况下，后者的手动开关不能定位成直接测量通过遮挡膜片的光线，因此曝光时间相当于灯泡曝光，仅持续到操作者 释放快门跳闸部件。