JPS5641651A - Electron gun for cathode ray tube - Google Patents

Electron gun for cathode ray tube

Info

Publication number
JPS5641651A
JPS5641651A JP11667479A JP11667479A JPS5641651A JP S5641651 A JPS5641651 A JP S5641651A JP 11667479 A JP11667479 A JP 11667479A JP 11667479 A JP11667479 A JP 11667479A JP S5641651 A JPS5641651 A JP S5641651A
Authority
JP
Japan
Prior art keywords
grid
hole
looked
character
fluorescent screen
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
JP11667479A
Other languages
Japanese (ja)
Other versions
JPH0142108B2 (en
Inventor
Takafumi Koga
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP11667479A priority Critical patent/JPS5641651A/en
Publication of JPS5641651A publication Critical patent/JPS5641651A/en
Publication of JPH0142108B2 publication Critical patent/JPH0142108B2/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
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes

Abstract

PURPOSE:To improve the character of life of a cathode ray tube without deteriorating the character of its resolution by forming the hole of each of control grid and accelerating grid so as to cause a part of the periphery of the hole to protrude and make it look different when looked from the fluorescent screen side and from the cathode side. CONSTITUTION:The shape of the hole of each of the first grid and the second grid is formed so as to make it look different when looked from the fluorescent screen side and from the cathode side. It is achieved by the following method. Projections 21 inclined to the fluorescent screen side are formed at both insides on X-X' axis of a hole 20 of the first grid respectively. Then, this hole of the first grid is formed so as to make it look like a circle 22 when it is looked from the fluorescent screen side and like an ellipse 23 when it is looked from the cathode side. Accordingly, the character of life can be improved easily without deteriorating the character of resolution, in spite of their opposite characters.
JP11667479A 1979-09-13 1979-09-13 Electron gun for cathode ray tube Granted JPS5641651A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11667479A JPS5641651A (en) 1979-09-13 1979-09-13 Electron gun for cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11667479A JPS5641651A (en) 1979-09-13 1979-09-13 Electron gun for cathode ray tube

Publications (2)

Publication Number Publication Date
JPS5641651A true JPS5641651A (en) 1981-04-18
JPH0142108B2 JPH0142108B2 (en) 1989-09-11

Family

ID=14693074

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11667479A Granted JPS5641651A (en) 1979-09-13 1979-09-13 Electron gun for cathode ray tube

Country Status (1)

Country Link
JP (1) JPS5641651A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54117677A (en) * 1978-03-06 1979-09-12 Hitachi Ltd Electron gun

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54117677A (en) * 1978-03-06 1979-09-12 Hitachi Ltd Electron gun

Also Published As

Publication number Publication date
JPH0142108B2 (en) 1989-09-11

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