JPS6093382U

JPS6093382U - Electronic viewfinder device

Info

Publication number: JPS6093382U
Application number: JP18474183U
Authority: JP
Inventors: 尚江波戸
Original assignee: 日本電気ホームエレクトロニクス株式会社
Priority date: 1983-11-30
Filing date: 1983-11-30
Publication date: 1985-06-26

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図は従来の電子ビューファインダ内のブラウン管の
表示画面を示す図、第２図は従来例を示す回路図、第３
図は本考案の１実施例を示す回路図、第４図は第３図の
実施例における各部の波形および表示画面を示す図であ
る。３．４，５．９・・・白バランス回路、６・・・マトリ
クス回路、１０，１１．１２・・・原色信号レベル検出
回路、１３．１６・・・交差出力選択手段、１４・・・
ミキサ。Fig. 1 is a diagram showing the display screen of a cathode ray tube in a conventional electronic viewfinder, Fig. 2 is a circuit diagram showing a conventional example, and Fig. 3 is a diagram showing a display screen of a cathode ray tube in a conventional electronic viewfinder.
The figure is a circuit diagram showing one embodiment of the present invention, and FIG. 4 is a diagram showing waveforms and display screens of various parts in the embodiment of FIG. 3. 3.4, 5.9... White balance circuit, 6... Matrix circuit, 10, 11.12... Primary color signal level detection circuit, 13.16... Cross output selection means, 14...
mixer.

Claims

[Claims for Utility Model Registration] It has a matrix circuit that inputs three primary color signals of R, G, and B output from a color separation circuit to form a color difference signal and a luminance signal, which are input to the matrix circuit. An electronic viewfinder device for a color camera, which has a white balance circuit that automatically adjusts the levels of the three primary color signals to match each other, wherein each of the three primary color signals and a horizontal sawtooth wave are inputted, a primary color signal level detection circuit that indicates a level match between the signal and the horizontal sawtooth wave and outputs three crossing outputs corresponding to each primary color signal; and a primary color signal level detection circuit that outputs each of the crossing outputs by switching each of the crossing outputs every plural consecutive horizontal scanning periods. An electronic viewfinder device comprising cross output selection means and a mixer for mixing each selected cross output into a display signal of a cathode ray tube.