JPS558107A - Demagnetizing device for video projection unit - Google Patents

Demagnetizing device for video projection unit

Info

Publication number
JPS558107A
JPS558107A JP7993578A JP7993578A JPS558107A JP S558107 A JPS558107 A JP S558107A JP 7993578 A JP7993578 A JP 7993578A JP 7993578 A JP7993578 A JP 7993578A JP S558107 A JPS558107 A JP S558107A
Authority
JP
Japan
Prior art keywords
convergence
yoke
time
current
attenuation
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.)
Pending
Application number
JP7993578A
Other languages
Japanese (ja)
Inventor
Nobuo Minoura
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP7993578A priority Critical patent/JPS558107A/en
Publication of JPS558107A publication Critical patent/JPS558107A/en
Pending legal-status Critical Current

Links

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE: To prevent the magnetization of the convergence yoke by piling properly the attenuation oscillating current onto the current of the convergence yoke provided to the Braun tube.
CONSTITUTION: In order to correct the convergence distortion or the like on the projection screen, convergence current (a) of a fixed waveform is flown to convergence yoke 2 provided to Braun tubes of red, blue and green each from convergence correction circuit 1 at the normal operation time. And at the specified time, i.e., when yoke 2 is magnetized at the generation time of the intra-tube discharge or the power supply ON time, etc., the attenuation oscillation is supplied to circuit 1 from attenuation oscillation generation circuit 4. And then the current (b) piled on with the antenuation oscillation is supplied to yoke 2 to carry out the demagnetization. Furthermore, the demagnetization is also possible at an opptional time by means of manual switch 6.
COPYRIGHT: (C)1980,JPO&Japio
JP7993578A 1978-06-30 1978-06-30 Demagnetizing device for video projection unit Pending JPS558107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7993578A JPS558107A (en) 1978-06-30 1978-06-30 Demagnetizing device for video projection unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7993578A JPS558107A (en) 1978-06-30 1978-06-30 Demagnetizing device for video projection unit

Publications (1)

Publication Number Publication Date
JPS558107A true JPS558107A (en) 1980-01-21

Family

ID=13704165

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7993578A Pending JPS558107A (en) 1978-06-30 1978-06-30 Demagnetizing device for video projection unit

Country Status (1)

Country Link
JP (1) JPS558107A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920222A3 (en) * 1997-11-28 2000-02-02 Nokia Display Products Oy Method and apparatus for correcting image errors caused by residual magnetism in a picture tube

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4312100Y1 (en) * 1966-01-17 1968-05-24
JPS4938140B1 (en) * 1971-03-20 1974-10-15

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4312100Y1 (en) * 1966-01-17 1968-05-24
JPS4938140B1 (en) * 1971-03-20 1974-10-15

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0920222A3 (en) * 1997-11-28 2000-02-02 Nokia Display Products Oy Method and apparatus for correcting image errors caused by residual magnetism in a picture tube

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