JPS54139372A - Cathode-ray tube - Google Patents
Cathode-ray tubeInfo
- Publication number
- JPS54139372A JPS54139372A JP4755278A JP4755278A JPS54139372A JP S54139372 A JPS54139372 A JP S54139372A JP 4755278 A JP4755278 A JP 4755278A JP 4755278 A JP4755278 A JP 4755278A JP S54139372 A JPS54139372 A JP S54139372A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic field
- pole piece
- screen
- electron
- 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
Links
Abstract
PURPOSE: To prevent the deterioration of resolution around the screen by making the vertical deflecting leak magnetic field of the neck part of a color Braun tube, etc., into a pincushion magnetic field by the pole piece of a soft magnetic substance.
CONSTITUTION: Pole piece 12 consisting of a soft magnetic substance such as Permalloy is arranged near holes 11, where electron beams pass, of shield cup 10 in the neck part of cathode-ray tube 3 having deflecting yoke in the external. Therefore, the magnetic field distribution of each beam passing hole is changed from leak magnetic field 13 in case of no pole piece to pincushion magnetic field 14, and the magnetic field is weak near the center and strong in the electron passing region of the vertically most outside circumference. Consequently, the electron deflection of the most outside circumference becomes large to reduce the halo (a large region of beam diameters downward in the screen upper part and upward in the lower part) which is easy to generate around the screen thereby improving resolution.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4755278A JPS54139372A (en) | 1978-04-20 | 1978-04-20 | Cathode-ray tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4755278A JPS54139372A (en) | 1978-04-20 | 1978-04-20 | Cathode-ray tube |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54139372A true JPS54139372A (en) | 1979-10-29 |
Family
ID=12778317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4755278A Pending JPS54139372A (en) | 1978-04-20 | 1978-04-20 | Cathode-ray tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54139372A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0742576A2 (en) * | 1995-05-12 | 1996-11-13 | Hitachi, Ltd. | Method of correcting deflection defocusing in a CRT, a CRT employing same, and an image display system including same CRT |
US6005340A (en) * | 1996-02-27 | 1999-12-21 | Hitachi, Ltd. | CRT, deflection-defocusing correcting member therefor, a method of manufacturing same member, and an image display system including same CRT |
CN1082715C (en) * | 1996-09-04 | 2002-04-10 | 株式会社日立制作所 | Color cathode ray tube with coma reduced |
US6376980B1 (en) | 1996-10-14 | 2002-04-23 | Hitachi, Ltd. | CRT having an electron gun with magnetic pieces attached to one of a plurality of electrodes, configured to correct deflection defocusing |
KR100708630B1 (en) * | 2000-03-14 | 2007-04-18 | 삼성에스디아이 주식회사 | Electron gun and color cathode ray tube utilizing the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54123869A (en) * | 1978-02-27 | 1979-09-26 | Philips Nv | Color camera |
-
1978
- 1978-04-20 JP JP4755278A patent/JPS54139372A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54123869A (en) * | 1978-02-27 | 1979-09-26 | Philips Nv | Color camera |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0742576A2 (en) * | 1995-05-12 | 1996-11-13 | Hitachi, Ltd. | Method of correcting deflection defocusing in a CRT, a CRT employing same, and an image display system including same CRT |
EP0742576A3 (en) * | 1995-05-12 | 1997-03-26 | Hitachi Ltd | Method of correcting deflection defocusing in a CRT, a CRT employing same, and an image display system including same CRT |
US6005339A (en) * | 1995-05-12 | 1999-12-21 | Hitachi, Ltd. | CRT with deflection defocusing correction |
US6329746B1 (en) | 1995-05-12 | 2001-12-11 | Hitachi, Ltd. | Method of correcting deflection defocusing in a CRT, a CRT employing same, and an image display system including same CRT |
US6005340A (en) * | 1996-02-27 | 1999-12-21 | Hitachi, Ltd. | CRT, deflection-defocusing correcting member therefor, a method of manufacturing same member, and an image display system including same CRT |
US6259196B1 (en) | 1996-02-27 | 2001-07-10 | Hitachi, Ltd. | CRT deflection-defocusing correcting member therefor, a method of manufacturing same member, and an image display system including same CRT |
CN1082715C (en) * | 1996-09-04 | 2002-04-10 | 株式会社日立制作所 | Color cathode ray tube with coma reduced |
US6376980B1 (en) | 1996-10-14 | 2002-04-23 | Hitachi, Ltd. | CRT having an electron gun with magnetic pieces attached to one of a plurality of electrodes, configured to correct deflection defocusing |
KR100708630B1 (en) * | 2000-03-14 | 2007-04-18 | 삼성에스디아이 주식회사 | Electron gun and color cathode ray tube utilizing the same |
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