JPS60132073U

JPS60132073U - Video camera automatic aperture device

Info

Publication number: JPS60132073U
Application number: JP1754184U
Authority: JP
Inventors: 寛横川
Original assignee: 株式会社東芝
Priority date: 1984-02-13
Filing date: 1984-02-13
Publication date: 1985-09-04

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は従来のビデオカメラの自動絞り装置の一例を示
した回路図、第２図は第１図に示した絞りの詳細例を示
した図、第３図は本考案のビデオカメラの自動絞り装置
の一実施例を示した回路図、第４図は第１図の原点補正
回路の一例を示した回路図である。１・・・レンズ、２・・・受光素子、３・・・絞り、４
・・・増幅器、５−・・比較器、６，９・・・演算増幅
器、１０・・・積分回路、１１・・・表示器、１２・・
・原点補正回路、１４・・・絞り設定器、１５・・・ス
イッチ、Ｃ１，Ｃ２・・・コンデンサ、Ｒ１，Ｒ２・・
・抵抗。Fig. 1 is a circuit diagram showing an example of an automatic aperture device for a conventional video camera, Fig. 2 is a diagram showing a detailed example of the aperture shown in Fig. 1, and Fig. 3 is a circuit diagram showing an example of an automatic aperture device for a video camera according to the present invention. FIG. 4 is a circuit diagram showing an example of the aperture device. FIG. 4 is a circuit diagram showing an example of the origin correction circuit shown in FIG. 1... Lens, 2... Light receiving element, 3... Aperture, 4
... Amplifier, 5-... Comparator, 6, 9... Operational amplifier, 10... Integrating circuit, 11... Display, 12...
・Origin correction circuit, 14... Aperture setting device, 15... Switch, C1, C2... Capacitor, R1, R2...
·resistance.

Claims

[Scope of utility model registration request]

(1) In an automatic aperture device for a video camera that opens and closes the aperture blades so that the amount of light incident on the light receiving element of the video camera is always constant, the voltage generated by the control coil that maintains the opening and closing speed of the aperture blades is It is equipped with an integrating circuit that generates a voltage proportional to the opening angle of the aperture blades based on the input voltage, and a display that displays the opening angle (aperture value) of the aperture blades based on the output voltage of this integrating circuit. Automatic aperture device for video cameras. (2) The scope of the utility model registration claim, characterized in that an origin correction circuit is connected to the integration circuit, which corrects the origin of the integration circuit by shorting an integration capacitor when the aperture blades are in an open state. An automatic aperture device for a video camera according to item 1.