JPS6438946A - Color picture tube device - Google Patents
Color picture tube deviceInfo
- 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
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.
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)
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 |
-
1987
- 1987-08-05 JP JP19444787A patent/JP2573238B2/en not_active Expired - Lifetime
Cited By (2)
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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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EXPY | Cancellation because of completion of term | ||
FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20071024 Year of fee payment: 11 |