JPS54161232A - Cathode-ray tube and its manufacture - Google Patents

Cathode-ray tube and its manufacture

Info

Publication number
JPS54161232A
JPS54161232A JP6981378A JP6981378A JPS54161232A JP S54161232 A JPS54161232 A JP S54161232A JP 6981378 A JP6981378 A JP 6981378A JP 6981378 A JP6981378 A JP 6981378A JP S54161232 A JPS54161232 A JP S54161232A
Authority
JP
Japan
Prior art keywords
electron
spot
expanding
beam passage
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
JP6981378A
Other languages
Japanese (ja)
Inventor
Masanobu Takada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6981378A priority Critical patent/JPS54161232A/en
Publication of JPS54161232A publication Critical patent/JPS54161232A/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
    • H01J29/563—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses for controlling cross-section

Landscapes

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

Abstract

PURPOSE:To decrease the length ratio of an electron-beam spot over the entire screen by providing an electromagnetic piece between a pre-focus lens and main lens surrounding an electron beam passage and by contracting the spot on the screen horizontally while expanding it vertically. CONSTITUTION:Near the electron-beam passage of the 3rd grid 9, namely, between the pre-focus lens and main lens, magnet piece 11 is provided surrounding the electron-beam passage. Then, an electron beam is made to fly piercing magnet piece 11 at its inside from your side and force 13 shown by the arrow acts upon magnetic lines of force 12 to contract the beam spot horizontally while expanding it vertically. This constitution reduces the length ratio of the spot over the entire screen, making a picture easy to see.
JP6981378A 1978-06-12 1978-06-12 Cathode-ray tube and its manufacture Pending JPS54161232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6981378A JPS54161232A (en) 1978-06-12 1978-06-12 Cathode-ray tube and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6981378A JPS54161232A (en) 1978-06-12 1978-06-12 Cathode-ray tube and its manufacture

Publications (1)

Publication Number Publication Date
JPS54161232A true JPS54161232A (en) 1979-12-20

Family

ID=13413566

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6981378A Pending JPS54161232A (en) 1978-06-12 1978-06-12 Cathode-ray tube and its manufacture

Country Status (1)

Country Link
JP (1) JPS54161232A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60180045A (en) * 1984-02-24 1985-09-13 Matsushita Electronics Corp Method of manufacturing cathode ray tube
JPS62103160U (en) * 1985-12-19 1987-07-01

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60180045A (en) * 1984-02-24 1985-09-13 Matsushita Electronics Corp Method of manufacturing cathode ray tube
JPH0365607B2 (en) * 1984-02-24 1991-10-14
JPS62103160U (en) * 1985-12-19 1987-07-01

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