JPS5614789A - Magnetic erasing method - Google Patents

Magnetic erasing method

Info

Publication number
JPS5614789A
JPS5614789A JP9132479A JP9132479A JPS5614789A JP S5614789 A JPS5614789 A JP S5614789A JP 9132479 A JP9132479 A JP 9132479A JP 9132479 A JP9132479 A JP 9132479A JP S5614789 A JPS5614789 A JP S5614789A
Authority
JP
Japan
Prior art keywords
magnetic
band
image tube
substance
erasing coil
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
JP9132479A
Other languages
Japanese (ja)
Inventor
Kazutoshi Segawa
Takeshi Okumura
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP9132479A priority Critical patent/JPS5614789A/en
Publication of JPS5614789A publication Critical patent/JPS5614789A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/29—Picture reproducers using cathode ray tubes using demagnetisation or compensation of external magnetic fields
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

PURPOSE:To suppress a magnetic field entering a fluorescent screen in parallel by demagnetizing the inside of an image tube and a substance of high magnetic permeability at the same time, by arranging the substance of high magnetic permeability covering the image tube at the circumference of the image tube and further by arranging a magnetic erasing coil. CONSTITUTION:Image tube 11 is shielded from an external magnetic field and then covered with ferromagnetic substance band 12 for strong demagnetization. Further, magnetic erasing coil 13 is arranged which demagnetized image tube 11 and ferromagnetic-substance band 12 at the same time. Image tube 11 is demagnetized stronger when ferromagnetic-substance band 12 is equipped (b) than when no band is equipped (a). Because the inductance of magnetic erasing coil 13 increases as a result of the arrangement of band 12 or the like near magnetic erasing coil 13 to increase the total magnetic flux generated by magnetic erasing coil 13. Magnetic erasing coil 13 demagnetizes band 12 as well.
JP9132479A 1979-07-18 1979-07-18 Magnetic erasing method Pending JPS5614789A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9132479A JPS5614789A (en) 1979-07-18 1979-07-18 Magnetic erasing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9132479A JPS5614789A (en) 1979-07-18 1979-07-18 Magnetic erasing method

Publications (1)

Publication Number Publication Date
JPS5614789A true JPS5614789A (en) 1981-02-13

Family

ID=14023268

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9132479A Pending JPS5614789A (en) 1979-07-18 1979-07-18 Magnetic erasing method

Country Status (1)

Country Link
JP (1) JPS5614789A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4943755A (en) * 1985-05-20 1990-07-24 Mitsubishi Denki Kabushiki Kaisha Magnetic shielding with constant-current coils for CRT
JPH0435053U (en) * 1990-07-16 1992-03-24

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140219A (en) * 1974-04-26 1975-11-10
JPS5343845B2 (en) * 1975-04-08 1978-11-24

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140219A (en) * 1974-04-26 1975-11-10
JPS5343845B2 (en) * 1975-04-08 1978-11-24

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4943755A (en) * 1985-05-20 1990-07-24 Mitsubishi Denki Kabushiki Kaisha Magnetic shielding with constant-current coils for CRT
JPH0435053U (en) * 1990-07-16 1992-03-24

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