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    • 2. 发明授权
    • Camera with changeable focal length
    • 相机具有可变焦距
    • US4896182A
    • 1990-01-23
    • US294810
    • 1989-01-09
    • Kazuhiro AkiyamaKazuo KamataHidemi Saito
    • Kazuhiro AkiyamaKazuo KamataHidemi Saito
    • G03B7/099G03B7/20G03B17/12
    • G03B7/20
    • A camera with a taking lens system changeable in focal length between a relatively long and a relatively short focal length, which has an exposure control meter comprising a masking member disposed in front of a photoelectric element to provide an electric exposure control output, and formed with first and second openings for allowing light that has passed therethrough to fall on the photoelectric element at different incident angles. A light stop member is movable to cover or uncover the second openings upon changing the taking lens system between the relatively long and relatively short focal lengths. Upon changing the taking lens system to the relatively short focal length, the light stop member is moved to uncover all of the first and second openings so as to increase the quantity of light falling on the photoelectric element and to permit that light to fall at an increased incident angle; and, on the other hand, upon shifting the taking lens system to the relatively long focal length, the light stop member is moved back so as to cover only the second opening means while uncovering the first openings, thereby to decrease the quantity of light falling on the photoelectric element and to permit that light to fall only at a decreased incident angle.
    • 具有拍摄镜头系统的相机可以在相对较长和相对短焦距之间的焦距上变化,其具有曝光控制仪,其包括设置在光电元件前面的掩模构件,以提供电曝光控制输出,并形成有 用于允许已经通过的光的第一和第二开口以不同的入射角落在光电元件上。 当在相对较长和相对短的焦距之间改变拍摄透镜系统时,光阻挡件可移动以覆盖或露出第二开口。 在将拍摄镜头系统改变为相对较短的焦距时,光停止构件被移动以露出所有第一和第二开口,以便增加落在光电元件上的光量,并允许光在 增加入射角; 另一方面,在将拍摄镜头系统移动到相对较长的焦距时,挡光部件向后移动,以便仅露出第二开口装置,同时露出第一开口,从而减少光的下落量 并且允许光仅在降低的入射角处下降。