公开(公告)号：US4922274A

公开(公告)日：1990-05-01

申请号：US368935

申请日：1989-06-19

申请人： Hiroshi Yamamoto ,  Shigeru Yoshida ,  Katumi Yoshida ,  Ryuji Suzuki ,  Tadashi Arai ,  Masachika Nishimura ,  Hiroaki Seino ,  Takehiko Ando

发明人： Hiroshi Yamamoto ,  Shigeru Yoshida ,  Katumi Yoshida ,  Ryuji Suzuki ,  Tadashi Arai ,  Masachika Nishimura ,  Hiroaki Seino ,  Takehiko Ando

IPC分类号： G03B7/10 ,  G03B9/06 ,  G03B9/02

CPC分类号： G03B7/10 ,  G03B9/06

摘要： A motor-driven type exposure adjusting device, such as a diaphragm-shutter device, adapted for a lens incorporating camera, an interchangeable lens, or the like. In the adjusting device, a rotary member has an optical path hole formed in a central portion thereof and is arranged to control the opening and closing actions of a plurality of light shielding blades. A stepping motor servers as a drive source for the rotation of the roatary member and is disposed outside of the optical path hole, and an aperture position detecting means detects a boundary between a given maximum aperture position defined by the light shielding blades and a stopped-down aperture position of the optical path hole. The aperture position of the optical path hole is detected through the rotating angle position of a rotary wheel to which the rotation output of the rotor shaft of the stepping motor is transmitted.

摘要翻译： 一种电动机型曝光调节装置，例如适用于包括相机的镜头，可更换镜头等的光圈快门装置。 在调节装置中，旋转构件具有形成在其中心部分的光路孔，并且被布置成控制多个遮光叶片的打开和关闭动作。 一种步进电动机服务器，用作驱动源，用于旋转所述光学元件，并且设置在所述光路孔的外部，并且孔径位置检测装置检测由所述遮光片所限定的给定最大光阑位置与所述光屏蔽片之间的边界， 光路孔的下光圈位置。 通过旋转轮的旋转角位置来检测光路孔的开口位置，转动轮的转子轴的旋转输出被传送到该旋转轮。