JPS6017068U

JPS6017068U - Focus display circuit

Info

Publication number: JPS6017068U
Application number: JP10798683U
Authority: JP
Inventors: 数馬　秀二
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 1983-07-12
Filing date: 1983-07-12
Publication date: 1985-02-05

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図は従来の焦点指示装置のブ菊ツク図、第２図は本
考案の一実施例における焦点表示回路のブ冶ツク図、第
３図は同実施例における水平及び垂直ワイドブランキン
グパルスを作成する回路を　、示す図、第４図はブラン
キング動作を示す図、第５図、第６図は同実施例回路に
おける客部の信号波形図、第７図は指標の表示例を示す
図、第８図は同実施例の具体回路を示す回路図である。２２・・・・・・高域通過フィルタ、２３・・・・・・
ブランキング回路、２４・・・・・・検波回路、２５・
・・・・・パルス幅変調回路、２６・・・・・・垂直用
パルス発生回路、２７・・・・・・水平用パルス発生回
路、２８・・・・・くキシング回路。丁　　　　　３ｔ＜３０）ｌｚ並Ｖ園！穂ｂ　　ＩＩ　　　　１１１　　　　′　　　−丁ＩＩ　　　　”　Ｔ５’１１　　　　ｋ−Ｎ −”　　　’−＋７，１１１１　　　□ １μｍ１冗− １ＬＩＪｉ　　　　ｉ　　　　−−− １１１１１ ’　　　　　　　　＋　　　　　　　　　　　１ｆｆｌ
ｐＨノ髪）レス、−μｍ−ｒ−０γ　　　゛１１、　１１Ｈ１一一一一一一一−ＨFig. 1 is a block diagram of a conventional focus indicating device, Fig. 2 is a block diagram of a focus indicating circuit according to an embodiment of the present invention, and Fig. 3 is a block diagram of a horizontal and vertical wide blanking pulse in the same embodiment. 4 is a diagram showing the blanking operation, FIGS. 5 and 6 are signal waveform diagrams of the customer section in the same embodiment circuit, and FIG. 7 is an example of indicator display. 8 are circuit diagrams showing specific circuits of the same embodiment. 22... High pass filter, 23...
Blanking circuit, 24...Detection circuit, 25.
. . . Pulse width modulation circuit, 26 . . . Vertical pulse generation circuit, 27 . . . Horizontal pulse generation circuit, 28 . . . Ding 3t< 30) lz average V garden! Ear b II 1 11' - Ding II "T5'1 1 k-N -"'-+7, 1 1 11 □ 1μm1 1 LIJ i i --- 1 1 1 1 1' + 1ffl
pH no hair) less, -μm-r-0γ ゛1 1, 11 H1 111111-H

Claims

[Scope of utility model registration request]

A filter that obtains a high frequency signal in the middle range or above from a video signal, a blanking circuit that blanks the output signal of the filter to obtain a high frequency signal only in the center of the screen, and a detector that detects the output signal of the blanking circuit. circuit and
a pulse width modulation circuit that changes the pulse width of a repetitive pulse at a vertical scanning frequency according to the output signal of the detection circuit; a vertical pulse generation circuit that is triggered by the output signal of the pulse width modulation circuit and generates a vertical pulse; It includes a horizontal pulse generation circuit that is triggered at the start point of a horizontal scanning period and generates a horizontal pulse, and a mixing circuit that mixes the vertical pulse, horizontal pulse, and video signal. A focus display circuit characterized by displaying an index for focus display on the right end.