JPS62186565U

JPS62186565U -

Info

Publication number: JPS62186565U
Application number: JP7479086U
Authority: JP
Priority date: 1986-05-19
Filing date: 1986-05-19
Publication date: 1987-11-27

Description

[Brief explanation of drawings]

第１図は本考案の一実施例のブロツク図、第２
図は第１図の実施例の要部の詳細回路図、第３図
は従来例のブロツク図、第４図は従来例の検波回
路の詳細回路図である。３……絞り、４……撮像素子、１０……平均値
検波回路、１７……比較回路、１８……積分回路
、１９……混合回路。 Fig. 1 is a block diagram of an embodiment of the present invention;
1 is a detailed circuit diagram of a main part of the embodiment shown in FIG. 1, FIG. 3 is a block diagram of a conventional example, and FIG. 4 is a detailed circuit diagram of a conventional detection circuit. 3... Aperture, 4... Image pickup element, 10... Average value detection circuit, 17... Comparison circuit, 18... Integrating circuit, 19... Mixing circuit.

Claims

[Claims for Utility Model Registration] An average value detection circuit that detects the average level of a video signal from an imaging means; a comparison circuit that provides an output when the level of the video signal is equal to or higher than a predetermined reference level; An integrating circuit provided at the next stage of the comparing circuit, and a mixing circuit for mixing the outputs of the average value detection circuit and the integrating circuit, and adjusting the aperture of the photographing lens based on the output of the mixing circuit. An auto iris system for video cameras featuring the following.