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    • 14. 发明授权
    • Photographic apparatus for providing a signal visible in a camera
viewfinder
    • 用于提供在相机取景器中可见的信号的照相设备
    • US4251146A
    • 1981-02-17
    • US7043
    • 1979-01-29
    • William T. Plummer
    • William T. Plummer
    • G03B17/20G03B7/08G03B19/12
    • G03B17/20G03B2217/005
    • Photographic indicator apparatus is provided for use in a folding type camera with a collapsible viewing device to provide a signal which is visible through an eyelens of the camera viewing device and which indicates that available scene light is below a threshold value which requires the use of an artificial light source to provide supplemental illumination of the scene or which will cause blurred pictures if the camera is hand held and no artificial light source is used. The low available scene light signal originates from an LED which is made visible through the eyelens by a specially configured prismatic optical element that defines a deviated optical path between the eyelens and the LED.
    • 提供照相指示装置用于具有可折叠观察装置的折叠式照相机,以提供通过照相机观察装置的眼睛可见的信号,并且其指示可用场景光低于需要使用 人造光源提供场景的补充照明,或者如果相机是手持的并且不使用人造光源,则会引起模糊的图像。 低可用场景光信号源于通过眼睛通过特殊配置的棱镜光学元件可见的LED,其限定了眼睛和LED之间的偏斜光路。