JPS5995326U

JPS5995326U - Video camera aperture device with program shutter function

Info

Publication number: JPS5995326U
Application number: JP1982192487U
Authority: JP
Inventors: 茂男榎本
Original assignee: 旭光学工業株式会社
Priority date: 1982-12-20
Filing date: 1982-12-20
Publication date: 1984-06-28
Also published as: JPH0430584Y2

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図はビデオカメラに用いられる自動絞装置の制御回
路のブロック図、第２図は動画撮影とスチル撮影の両者
が可能なビデオカメラのブロック図、第３図は第２図の
ビデオカメラによる自動絞装置の動作例を示すシーケン
スダイアフラム、第・　　４図は第３図の動作シーケン
スを行なオ）せるためのシャッタ動作制御回路の構成例
を示すブロック図、第５図は自動露出スチル撮影を可能
とした露出時定回路のブロック図、第６図、はブ泊グラ
ム自動露出スチル撮影を行なう場合の動作例を示すシー
ケンスダイアグラム、第７図は第６図の動作シーケンス
を行なわせるための構成例を示すブロック図、第８図は
従来のビデオカメラによるスチル撮影時の絞の動作特性
例を示すグラフ、第９図は本考案に係るプログラムシャ
ッタ駆動回路の例を　　−示す回路図、第１０図は絞装
置の具体例を示す要部の縦断側面図、第１１図は第１０
図のＸＩ−ＸＩ線に沿う断面図、第１２図は本考案によ
るプログラムシャッタの立ち上がり特性の改善例を示す
グラフである。３・・・自動絞装置、５・・・自動絞動作制御回路、６
・・・シャッタ動作制御回路、２０・・・制御コイル、
２１・・・永久磁石、２２・・・ヨーク、２３・・・駆
動コイル、２４・・・回転軸、２６・・・絞開閉環、３
０・・・遅延　゛回路。Figure 1 is a block diagram of a control circuit for an automatic aperture device used in a video camera, Figure 2 is a block diagram of a video camera capable of both video shooting and still photography, and Figure 3 is a block diagram of a control circuit for an automatic aperture device used in a video camera. A sequence diaphragm showing an example of the operation of an automatic aperture device, Figure 4 is a block diagram showing an example of the configuration of a shutter operation control circuit for performing the operation sequence of Figure 3, and Figure 5 shows an example of automatic exposure still photography. Fig. 6 is a block diagram of an exposure time setting circuit that makes it possible to perform the operation sequence shown in Fig. 6. FIG. 8 is a block diagram showing an example of the configuration; FIG. 8 is a graph showing an example of the operating characteristics of the aperture during still shooting with a conventional video camera; FIG. 9 is a circuit diagram showing an example of the program shutter drive circuit according to the present invention; Figure 10 is a longitudinal cross-sectional side view of the main part showing a specific example of the squeezing device, and Figure 11 is the 10th
FIG. 12 is a cross-sectional view taken along the line XI--XI of the figure, and is a graph showing an example of improvement in the rise characteristics of the program shutter according to the present invention. 3... Automatic diaphragm device, 5... Automatic diaphragm operation control circuit, 6
... shutter operation control circuit, 20 ... control coil,
21... Permanent magnet, 22... Yoke, 23... Drive coil, 24... Rotating shaft, 26... Throttle opening/closing ring, 3
0...Delay circuit.

Claims

[Scope of utility model registration request]

The automatic diaphragm device of the video camera is driven by either an automatic diaphragm operation control circuit for video shooting or a shutter operation control circuit for still photography, the automatic diaphragm device being driven In a video camera aperture device whose drive side is controlled by a coil and a control coil for controlling operating speed, a switch element connected in series to the control coil and the shutter operation control circuit operate to operate the aperture device. 1. An aperture device for a video camera having a programmed shutter function, characterized in that a delay circuit is provided to turn on the switch element with a delay when the switch element starts an opening operation.