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    • 7. 发明申请
    • LIFE EXTENDER AND BRIGHT LIGHT PROTECTION FOR CCTV CAMERA SYSTEM WITH IMAGE INTENSIFIER
    • 带有图像增强器的闭路电视摄像机系统的生命延长器和亮度保护
    • WO1995006388A1
    • 1995-03-02
    • PCT/US1994009190
    • 1994-08-12
    • INTEVAC, INC.
    • INTEVAC, INC.SCOTT, Allan, W.POND, Norman, H.
    • H04N05/30
    • H01J31/507H01J29/98H01J2231/50015H01J2231/50073H01J2231/5016H04N5/2254H04N5/2352H04N5/238
    • A camera system for operating in nighttime lighting conditions without additional illumination includes an input lens (60) for receiving incoming light representative of an image, an image intensifier tube (61) for receiving the image from the input lens and producing an intensified image and a video camera (64) for receiving the intensified image. The life of the intensifier tube can be extended by automatically controlling its gain. The gain is sensed in an unused region of the intensifier tube, and the voltage applied to the intensifier tube is controlled to provide a desired gain. In addition, the intensifier tube can be gated on and off with a prescribed duty cycle to extend its life. A frame is stored when the intensifier tube is gated on, and the stored frame is repeated when the intensifier tube is gated off to provide a continuous series of images. The intensifier tube can be protected against bright light by turning it off for a prescribed time when the video signal exceeds a reference level that corresponds to a bright light.
    • 一种用于在夜间照明条件下操作而不需额外照明的相机系统包括用于接收代表图像的入射光的输入透镜(60),用于从输入透镜接收图像并产生增强图像的图像增强管(61) 用于接收强化图像的摄像机(64)。 增压管的寿命可以通过自动控制其增益来延长。 在增压管的未使用区域中感测到增益,并且控制施加到增压管的电压以提供期望的增益。 此外,增压管可以以规定的占空比进行开/关,以延长其使用寿命。 当加强管被门控时,存储框架,并且当增压管被选通时重复存储的框架以提供连续的一系列图像。 当视频信号超过对应于亮光的参考电平时,可以通过将增压管关闭规定时间来防止亮灯受到保护。