Optical device
    49.
    发明授权
    Optical device 有权
    光学装置

    公开(公告)号:US08909036B2

    公开(公告)日:2014-12-09

    申请号:US14025297

    申请日:2013-09-12

    发明人: Yuzuru Taguchi

    摘要: An optical device includes an optical system, a diaphragm unit, a diaphragm unit, a focus-lens driving unit, a diaphragm driving unit, and a diaphragm control unit. The diaphragm control unit controls the diaphragm driving unit in accordance with the position to which the focus lens group has been moved by the focus-lens driving unit, thereby controlling the aperture opening of the diaphragm unit and ultimately limit a light beam passing through the camera system.

    摘要翻译: 光学装置包括光学系统,光圈单元,光阑单元,聚焦透镜驱动单元,光阑驱动单元和光阑控制单元。 光圈控制单元根据聚焦透镜驱动单元移动了聚焦透镜组的位置来控制光阑驱动单元,从而控制光阑单元的孔径开度,并最终限制通过照相机的光束 系统。

    Photographic exposure meter arrangement with photoconductive cell
    50.
    发明授权
    Photographic exposure meter arrangement with photoconductive cell 失效
    摄影曝光表与光电池组合

    公开(公告)号:US3615141A

    公开(公告)日:1971-10-26

    申请号:US3615141D

    申请日:1968-09-30

    IPC分类号: G03B7/04 G01J1/44

    CPC分类号: G03B7/04

    摘要: EXPOSURE METER ARRANGEMENT WITH PHOTO-CONDUCTIVE CELL AND A BATTERY FEEDING THE LATTER, ALSO A GALVANOMETER THE POINTER ZERO POSITION OF WHICH INDICATES THE BALANCING OF THE MEASURING APPARATUS BROUGHT ABOUT BY RESISTANCE ATTENUATION ELEMENTS, AND THUS THE CORRECT COMBINATION OF THE EXPOSURE FACTORS ACCORDING TO BRIGHTNESS, WHEREIN ON THE ONE HAND THE ENTIRE MEASURING APPARATUS INCLUDING GALVANOMETER IS CONNECTIBLE THROUGH A SWITCH TO THE BATTERY AND IN THAT ON THE OTHER HAND WHEN THE BATTERY IS DISCONNECTED FROM THE ENTIRE MEASURING APPARATUS A PERMANENT CURRENT AT THE LEVEL OF THE SELF-DISCHARGE CURRENT OF THE BATTERY IS FED TO THE GALVANOMETER THROUGH AN AUXILIARY CURRENT PATH WHICH IS OF HIGH OHMIC VALUE IN COMPARISON WITH EVERY RESISTANCE VALUE OF THE MEASURING APPARATUS.