JPS57199153A - Cathode-ray tube - Google Patents

Cathode-ray tube

Info

Publication number
JPS57199153A
JPS57199153A JP8508781A JP8508781A JPS57199153A JP S57199153 A JPS57199153 A JP S57199153A JP 8508781 A JP8508781 A JP 8508781A JP 8508781 A JP8508781 A JP 8508781A JP S57199153 A JPS57199153 A JP S57199153A
Authority
JP
Japan
Prior art keywords
crt1
axis
earth magnetism
rotation
cathode
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
JP8508781A
Other languages
Japanese (ja)
Inventor
Haruaki Wada
Tsutomu Tachibana
Takashi Toyama
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Priority to JP8508781A priority Critical patent/JPS57199153A/en
Publication of JPS57199153A publication Critical patent/JPS57199153A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses

Abstract

PURPOSE:To provide a cathode-ray tube which can correct not only the raster rotation caused by the component of the axial direction of the earth magnetism but also the rotation of the electron beam itself caused during the correction of the raster rotation. CONSTITUTION:A CRT1 is provided with a deflecting part 20 which extends from the picture surface side of an electromagnetic focusing part 10, from a neck 2 of the CRT1, to the funnel of the CRT1. A first annular coil 31 symmetrical about the axis (z) of the CRT1 is installed at the front end of the axis (z) of the deflecting part 20. The raster rotation caused by the earth magnetism of the first coil 31 can be corrected by feeding a current which produces a magnetic field extinguishing rhe z-axis component of the earth magnetism, that is to say, a current producing a magnetic field in the reverse direction to the earth magnetism. In addition, a second annular coil 32 symmetrical about the axis (z) is provided at a given position of the neck 2, for example, in the space formed between annular permanent magnets 11 and 12 of the focusing part 10 so as to correct the rotation of the beam itself (the tilt of a vertically long spot).
JP8508781A 1981-06-03 1981-06-03 Cathode-ray tube Pending JPS57199153A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8508781A JPS57199153A (en) 1981-06-03 1981-06-03 Cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8508781A JPS57199153A (en) 1981-06-03 1981-06-03 Cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS57199153A true JPS57199153A (en) 1982-12-07

Family

ID=13848820

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8508781A Pending JPS57199153A (en) 1981-06-03 1981-06-03 Cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS57199153A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG92590A1 (en) * 1992-03-27 2002-11-19 Thomson Tubes & Displays Permanent magnet focus unit wihh integral astigmatism corrector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG92590A1 (en) * 1992-03-27 2002-11-19 Thomson Tubes & Displays Permanent magnet focus unit wihh integral astigmatism corrector

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