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1. 发明授权

US3988776A System for controlling excessive incident light in color television cameras 失效
标题翻译：用于控制彩色电视摄像机中过多入射光的系统
公开(公告)号：US3988776A
公开(公告)日：1976-10-26
申请号：US527371
申请日：1974-11-26
申请人： Takashi Shinozaki , Seigo Kokufukata , Shintaro Nakagaki , Tetsushi Satoh
发明人： Takashi Shinozaki , Seigo Kokufukata , Shintaro Nakagaki , Tetsushi Satoh
IPC分类号： H04N5/235 , H04N9/07 , H04N5/193
CPC分类号： H04N5/2358
摘要： A color television camera has a camera tube for receiving incident light from an image pickup object. It produces output signals representing an image of the object. The signal level varies in accordance with the incident light quantity assuming a constant target voltage. The system disposes of excessive incident light quantity. A control circuit lowers the voltage impressed on the target of the camera tube and controls the output signal level of the camera tube at a constant value, when the incident light quantity to the camera tube becomes excessive and exceeds a first predetermined light quantity. An indicator indicates when the incident light quantity to the camera tube becomes excessive, exceeding a second predetermined light quantity which is greater than the first predetermined light quantity. The resulting pickup picture deteriorates when the light exceeds a practical allowable limit despite the operation of the control circuit. An iris mechanism is manually operable to reduce the incident light quantity when the indicator indicates that the incident light quantity is in excess of the second predetermined light quantity.
摘要翻译：彩色电视摄像机具有用于接收来自摄像对象的入射光的照相机管。它产生表示对象的图像的输出信号。假设恒定的目标电压，信号电平根据入射光量而变化。系统处理过多的入射光量。当照相机管的入射光量变得过大并且超过第一预定光量时，控制电路降低照相机管的目标上施加的电压并将照相机管的输出信号电平控制在恒定值。指示器指示当照相机管的入射光量何时变得过大时，超过比第一预定光量大的第二预定光量。尽管控制电路的操作，当光线超过实际允许极限时，所得到的拍摄图像劣化。当指示器指示入射光量超过第二预定光量时，可手动操作光圈机构以减少入射光量。

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