JPS5986775U

JPS5986775U - Video camera viewfinder display device

Info

Publication number: JPS5986775U
Application number: JP18342382U
Authority: JP
Inventors: 杉原　正一
Original assignee: 三菱電機株式会社
Priority date: 1982-12-01
Filing date: 1982-12-01
Publication date: 1984-06-12

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 the drawing]

第１図はこの考案の一実施例の概略ブロック図である。第２図ないし第４図はこの考案の一実施例の動作を説明
するための図であり、特に第２図ａは被写体を示し、第
２図すは被写体の中央部を走査したときのビデオ信号を
示す波形図であり、第３図ａはフォーカスが正確に調整
された被写体の画像を示す図であり、第３図すはそのと
きの波形図である。第４図ａはフォーカスがずれている
場合の被写体の画像を示す図であり、第４図すはそのと
きの波形図である。第５図は第１図の各部の動作波形図
である。図において、２は微分回路、３はブランキング回路、５
は全波整流回路、６はランプ波発生回路、７は電圧比較
器、８は微分回路、９はクリップ回路、１０は混合回路
、１１はセットアツプ補正回路、２０は被写体を示す。 −−一一−リ髭− 一−−−〜こ−FIG. 1 is a schematic block diagram of an embodiment of this invention. Figures 2 to 4 are diagrams for explaining the operation of an embodiment of this invention. In particular, Figure 2a shows a subject, and Figure 2 shows a video when scanning the center of the subject. FIG. 3A is a waveform diagram showing signals, and FIG. 3A is a diagram showing an image of a subject whose focus has been accurately adjusted, and FIG. 3A is a waveform diagram at that time. FIG. 4a is a diagram showing an image of a subject when the focus is shifted, and FIG. 4a is a waveform diagram at that time. FIG. 5 is an operation waveform diagram of each part of FIG. 1. In the figure, 2 is a differential circuit, 3 is a blanking circuit, and 5 is a differential circuit.
1 is a full-wave rectifier circuit, 6 is a ramp wave generation circuit, 7 is a voltage comparator, 8 is a differentiation circuit, 9 is a clip circuit, 10 is a mixing circuit, 11 is a setup correction circuit, and 20 is a subject. −−11−ribeard− 1−−−~ko−

Claims

[Scope of utility model registration request]

(1) A viewfinder display device that displays instructions for focus adjustment on a cathode ray tube installed in a video camera, the display device including a viewfinder display device that displays instructions for focus adjustment on a cathode ray tube provided in a video camera; A viewfinder display device for a video camera, comprising edge signal detection means for detecting a signal, and display control means for displaying the magnitude of the edge signal on the cathode ray tube.

(2) The viewfinder display device for a video camera according to claim 1, wherein the display control means displays the edge signal as strength in the horizontal direction on the screen of the cathode ray tube.

(3) The edge signal detection means includes a differentiating circuit that differentiates the video signal, and a blanking circuit that gates the output of the differentiating circuit based on a window signal corresponding to the center of the screen, registered as a utility model. A viewfinder display device for a video camera according to claim 1.

(4) The display control means compares a rectifier circuit that rectifies the edge signal and outputs a DC voltage, a lamp voltage generation circuit that generates a lamp voltage, and an output of the rectification circuit and an output of the lamp voltage generation circuit. do,
a comparison circuit that outputs a rectangular wave signal; a differentiation circuit that differentiates the output of the comparison circuit; a clip circuit that clips the output of the differentiation circuit; 5. A viewfinder display device for a video camera according to claim 2 of the utility model registration claim, comprising a circuit.

(5) The utility model registration claim 4 further includes means for applying a 1ζ DC voltage to the mixing circuit based on the window signal in order to increase the brightness of the edge signal displayed on the cathode ray tube. Video camera viewfinder display device.