JPS5936152U

JPS5936152U - Beam convergence correction device for CRT imaging equipment

Info

Publication number: JPS5936152U
Application number: JP10577283U
Authority: JP
Inventors: 河野　建次; 雅夫秋吉
Original assignee: Fujitsu Ltd
Current assignee: Fujitsu Ltd
Priority date: 1983-07-07
Filing date: 1983-07-07
Publication date: 1984-03-07
Also published as: JPH0129711Y2

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図はアステイグマチズム（ホーカス歪み）を例示す
る図、第２図は１対のアステイグコイルを例示する図、
第３図は本考案にかかるＣＲＴ管面の分割を例示する図
、第４図は本考案にかかるＣＲＴ画像機器を例示する図
、第５図は本考案に　　゛かかるアンプ１４の具体的構
成を例示する図、第６図は本考案にかかる電圧発生器９
又は１０の具体的構成を例示する図である。１・・・・・・ＣＲＴ、２・・・・・・偏向コイル、３
・・・・・・スタティックホーカスコイル、４・・・・
・・グイナミツクホーカスコイル、５．　５ａ・・・・
・・アステイグコイル、６．７，１１．　１２．　１３
・・・・・・コンバータ、８・・・・・・定電流回路、
９，１０・・・・・・電圧発生器、１４・・・・・・ア
ンプ、Ａ〜Ｈ，０・・・・・・領域、ＳＡ・・・・・・
エリア選択信号、ＢＭ・・・・・・ビーム、１５．１６
・・・・・・デコーダ、ＳＷＡ〜ＳＷＨ，ＳＷＯ，５Ｗ
Ａｌ〜５ＷＨ１゜ｓｗｏｌ・・・・・・スイッチ、ＲＶ
Ａ〜ＲＶＨ，ＲＶＯ・・・・・・可変抵抗、ＲＤＡ−Ｒ
ＤＨ，ＲＤＯ・・・・・・分圧抵抗、ＭＰＸ・・・・・
・マルチプレクサ。Figure 1 is a diagram illustrating astigmatism (focus distortion), Figure 2 is a diagram illustrating a pair of astigmatism,
FIG. 3 is a diagram illustrating the division of a CRT tube surface according to the present invention, FIG. 4 is a diagram illustrating a CRT imaging device according to the present invention, and FIG. 5 is a diagram illustrating the specific configuration of the amplifier 14 according to the present invention. An illustrative diagram, FIG. 6, shows a voltage generator 9 according to the present invention.
FIG. 1...CRT, 2...Deflection coil, 3
...Static hocus coil, 4...
... Guinamitsuku Hocus Coil, 5. 5a...
... Asteig Coil, 6.7, 11. 12. 13
...Converter, 8... Constant current circuit,
9, 10... Voltage generator, 14... Amplifier, A to H, 0... Area, SA...
Area selection signal, BM...beam, 15.16
・・・・・・Decoder, SWA~SWH, SWO, 5W
Al~5WH1゜swol...Switch, RV
A~RVH, RVO...Variable resistance, RDA-R
DH, RDO・・・・・・Voltage dividing resistor, MPX・・・・・・
・Multiplexer.

Claims

[Scope of utility model registration request]

(1) Correct beam convergence distortion on the screen of an imaging device using a CRT by flowing a convergence current corresponding to the beam deflection position to a focus correction coil on the screen, such as a Guinamitsu Ho force coil or an asteig coil. In the beam convergence correction, the tube surface of the CRT is divided into a plurality of regions corresponding to the beam deflection position, and a value corresponding to the correction amount in each region is prepared corresponding to each of the plurality of regions. A plurality of switch means adjusted to the beam position and a switching means for selecting and operating one of the switch means corresponding to the area where the beam is located are provided. A beam convergence correction device for an imaging device using a CRT, comprising means for controlling a current flowing through the focus correction coil in response to a selected state.

(2) As a means for controlling the current flowing through the focus correction coil, an arithmetic amplifier is used in which the amplification rate is determined when a switch selected by the switching means among the plurality of switches becomes conductive. A beam convergence correction device for an imaging device using a CRT according to claim 1, wherein the output of the operational amplifier is used as a voltage that determines the current flowing through the correction coil. -(3) As means for controlling the current flowing through the focus correction coil,
A voltage generator that generates a value prepared in advance in response to the state when a switch selected by the switching means among the plurality of switches becomes conductive; 2. A beam-focusing correction device for an imaging device using a CRT as claimed in claim 1, further comprising a voltage-current converter for creating a current flowing through the focus correction coil.