JPS55166851A - Electromagnetic focussing type cathode-ray tube - Google Patents

Electromagnetic focussing type cathode-ray tube

Info

Publication number
JPS55166851A
JPS55166851A JP7465979A JP7465979A JPS55166851A JP S55166851 A JPS55166851 A JP S55166851A JP 7465979 A JP7465979 A JP 7465979A JP 7465979 A JP7465979 A JP 7465979A JP S55166851 A JPS55166851 A JP S55166851A
Authority
JP
Japan
Prior art keywords
focussing
fluorescent screen
electromagnetic
beam spots
ray tube
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
JP7465979A
Other languages
Japanese (ja)
Other versions
JPH0142110B2 (en
Inventor
Soichi Sakurai
Kyohei Fukuda
Kuniharu Osakabe
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 JP7465979A priority Critical patent/JPS55166851A/en
Publication of JPS55166851A publication Critical patent/JPS55166851A/en
Publication of JPH0142110B2 publication Critical patent/JPH0142110B2/ja
Granted 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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane

Abstract

PURPOSE:To make round the shape of beam spots on the fluorescent screen by providing a means which does not make round the electron beam spots which are incident on the electromagnetic focussing site at the front stage of the electromagnetic focussing site. CONSTITUTION:The first grid electrode 23 has the non-disk type elliptical electron beams passing hole 23a and its long axis which is slightly inclined from the Y axis. When the electron beam radiated from the cathode 2 pass through this first grid electrode, direction (y) receives weaker focussing and the crossover of the electron beams moves on the fluorescent screen side. This moves the image point in the direction of (y) on the fluorescent screen side on it. By focussing the image point on the fluorescent screen in both the directions (x) and (y), the shape of the beam spots is made round.
JP7465979A 1979-06-15 1979-06-15 Electromagnetic focussing type cathode-ray tube Granted JPS55166851A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7465979A JPS55166851A (en) 1979-06-15 1979-06-15 Electromagnetic focussing type cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7465979A JPS55166851A (en) 1979-06-15 1979-06-15 Electromagnetic focussing type cathode-ray tube

Publications (2)

Publication Number Publication Date
JPS55166851A true JPS55166851A (en) 1980-12-26
JPH0142110B2 JPH0142110B2 (en) 1989-09-11

Family

ID=13553575

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7465979A Granted JPS55166851A (en) 1979-06-15 1979-06-15 Electromagnetic focussing type cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS55166851A (en)

Also Published As

Publication number Publication date
JPH0142110B2 (en) 1989-09-11

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