JPS5793779A - Convergence measuring device - Google Patents

Convergence measuring device

Info

Publication number
JPS5793779A
JPS5793779A JP16949480A JP16949480A JPS5793779A JP S5793779 A JPS5793779 A JP S5793779A JP 16949480 A JP16949480 A JP 16949480A JP 16949480 A JP16949480 A JP 16949480A JP S5793779 A JPS5793779 A JP S5793779A
Authority
JP
Japan
Prior art keywords
center coordinate
magnification
signal
color
magnetizing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP16949480A
Other languages
Japanese (ja)
Other versions
JPH0156594B2 (en
Inventor
Kazunari Hirayama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP16949480A priority Critical patent/JPS5793779A/en
Publication of JPS5793779A publication Critical patent/JPS5793779A/en
Publication of JPH0156594B2 publication Critical patent/JPH0156594B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details
    • H04N17/04—Diagnosis, testing or measuring for television systems or their details for receivers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/0007—Elimination of unwanted or stray electromagnetic effects
    • H01J2229/0046—Preventing or cancelling fields within the enclosure
    • H01J2229/0053—Demagnetisation

Abstract

PURPOSE:To change the magnification of a lens automatically, by sequentially repeating the measurement of center coordinate of B, G, R color signals and demagnetization, coinciding the color beams, and controlling the magnification of a zoom lens according to the degree of coincidence of the convergence. CONSTITUTION:A cross hatch pattern generator 6 is switched to output B, G, R signals sequentially to obtain the center coordinate. A signal from a sequential signal processor 17 is processed at a controller 18, and the charging voltage and direction of current of a magnetizing power supply 25 are determined according to each center coordinate. A magnetizing current flows to a ring-shape magnetizing coil 24 with a charging signal from a controller 18 to move the coil so as to converge the beam. The detection of a center coordinate and charge/discharge are repeated and demagnetization is made so as to coincide the three color beams A pulley 14 fixed to a zoom lens 15' is turned with a pulse motor 42 so as to enter each center coordinate of each color signal into the whole effective section of a photo detector 26 to change the magnification of lens automatically.
JP16949480A 1980-12-03 1980-12-03 Convergence measuring device Granted JPS5793779A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16949480A JPS5793779A (en) 1980-12-03 1980-12-03 Convergence measuring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16949480A JPS5793779A (en) 1980-12-03 1980-12-03 Convergence measuring device

Publications (2)

Publication Number Publication Date
JPS5793779A true JPS5793779A (en) 1982-06-10
JPH0156594B2 JPH0156594B2 (en) 1989-11-30

Family

ID=15887559

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16949480A Granted JPS5793779A (en) 1980-12-03 1980-12-03 Convergence measuring device

Country Status (1)

Country Link
JP (1) JPS5793779A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247627A2 (en) * 1986-05-29 1987-12-02 Hitachi, Ltd. Misconvergence amount measuring apparatus
JPH02174492A (en) * 1988-12-27 1990-07-05 Minolta Camera Co Ltd Convergence measuring instrument for color crt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0247627A2 (en) * 1986-05-29 1987-12-02 Hitachi, Ltd. Misconvergence amount measuring apparatus
JPH02174492A (en) * 1988-12-27 1990-07-05 Minolta Camera Co Ltd Convergence measuring instrument for color crt

Also Published As

Publication number Publication date
JPH0156594B2 (en) 1989-11-30

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