JPS6438946A - Color picture tube device - Google Patents

Color picture tube device

Info

Publication number
JPS6438946A
JPS6438946A JP19444787A JP19444787A JPS6438946A JP S6438946 A JPS6438946 A JP S6438946A JP 19444787 A JP19444787 A JP 19444787A JP 19444787 A JP19444787 A JP 19444787A JP S6438946 A JPS6438946 A JP S6438946A
Authority
JP
Japan
Prior art keywords
focusing
electron beams
lens
pair
prefocused
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
JP19444787A
Other languages
Japanese (ja)
Other versions
JP2573238B2 (en
Inventor
Taketoshi Shimoma
Shinpei Koshigoe
Takahiro Hasegawa
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
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 filed Critical Toshiba Corp
Priority to JP19444787A priority Critical patent/JP2573238B2/en
Publication of JPS6438946A publication Critical patent/JPS6438946A/en
Application granted granted Critical
Publication of JP2573238B2 publication Critical patent/JP2573238B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To obtain high resolution on the whole central and peripheral parts of a screen, by forming groove-shaped parts in a pair of electrodes which form a prefocused lens and next by disposing a pair of plate members inside a focusing electrode to vary a voltage applied to the focusing electrode. CONSTITUTION:In a prefocused lens part, recessed parts 330 are disposed on facing surfaces of electrodes 20, 31 so that an asymmetrical lens is formed to focus electron beams vertically on an under-focusing state. Further in a main lens part, a pair of plate members 50 are disposed to be parallel horizontally and facing vertically to each other inside a focusing electrode 30 so that an asymmetrical lens is formed to strongly focus the electron beams vertically. Next a focusing voltage is raised synchronizing with deflection of the electron beams. Since the electron beams are thus kept vertically on the under focusing state, distorted deflection due to vertically strong focusing actions can be reduced, so that high resolution can be obtained on the whole central and peripheral parts of the screen.
JP19444787A 1987-08-05 1987-08-05 Color picture tube device Expired - Lifetime JP2573238B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19444787A JP2573238B2 (en) 1987-08-05 1987-08-05 Color picture tube device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19444787A JP2573238B2 (en) 1987-08-05 1987-08-05 Color picture tube device

Publications (2)

Publication Number Publication Date
JPS6438946A true JPS6438946A (en) 1989-02-09
JP2573238B2 JP2573238B2 (en) 1997-01-22

Family

ID=16324724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19444787A Expired - Lifetime JP2573238B2 (en) 1987-08-05 1987-08-05 Color picture tube device

Country Status (1)

Country Link
JP (1) JP2573238B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5481157A (en) * 1993-04-23 1996-01-02 Mitsubishi Denki Kabushiki Kaisha Electron gun for cathode-ray tube
CN1054463C (en) * 1992-04-21 2000-07-12 株式会社日立制作所 Color cathode ray tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1054463C (en) * 1992-04-21 2000-07-12 株式会社日立制作所 Color cathode ray tube
US5481157A (en) * 1993-04-23 1996-01-02 Mitsubishi Denki Kabushiki Kaisha Electron gun for cathode-ray tube

Also Published As

Publication number Publication date
JP2573238B2 (en) 1997-01-22

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