JPS5591543A - Electron beam focusing device - Google Patents
Electron beam focusing deviceInfo
- Publication number
- JPS5591543A JPS5591543A JP16602278A JP16602278A JPS5591543A JP S5591543 A JPS5591543 A JP S5591543A JP 16602278 A JP16602278 A JP 16602278A JP 16602278 A JP16602278 A JP 16602278A JP S5591543 A JPS5591543 A JP S5591543A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- electron beam
- exciter coil
- focusing
- magnetic field
- 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 easily control the electron beam focusing, by concentrically providing on the periphery of the neck portion of a CRT a permanent magnet for over-focusing the electron beam and an exciter coil for producing a magnetic field in the direction opposite to that of said permanent magnet.
CONSTITUTION: The electron beam focusing magnetic device 7 mounted on the neck portion 1 of a CRT comprises an exciter coil 11, a permanent magnet 10, and a pair of yokes 12, 12 disposed at the opposite ends of these elements. The permanent magnet 10 is magnetized so as to over-focus the electron beam, and the focusing condition of the electron beam is adjusted by controlling the current supplied to th exciter coil 11 producing a magnetic field in the direction opposite to that of the permanent magnet. The temperature of the permanent magnet 10 is detected by a sensor 13 and an output thereof is supplied as an input to a control circuit (not shown in the figure) for the exciter coil 11, so that the temperature variation of the magnetic field of the permanent magnet is compensated.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16602278A JPS5591543A (en) | 1978-12-28 | 1978-12-28 | Electron beam focusing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16602278A JPS5591543A (en) | 1978-12-28 | 1978-12-28 | Electron beam focusing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5591543A true JPS5591543A (en) | 1980-07-11 |
JPS6334583B2 JPS6334583B2 (en) | 1988-07-11 |
Family
ID=15823464
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16602278A Granted JPS5591543A (en) | 1978-12-28 | 1978-12-28 | Electron beam focusing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5591543A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01256883A (en) * | 1988-04-07 | 1989-10-13 | Kooraru Kk | Magnetic circuit device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4725930U (en) * | 1971-04-21 | 1972-11-24 | ||
JPS5032565A (en) * | 1973-07-26 | 1975-03-29 |
-
1978
- 1978-12-28 JP JP16602278A patent/JPS5591543A/en active Granted
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4725930U (en) * | 1971-04-21 | 1972-11-24 | ||
JPS5032565A (en) * | 1973-07-26 | 1975-03-29 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01256883A (en) * | 1988-04-07 | 1989-10-13 | Kooraru Kk | Magnetic circuit device |
Also Published As
Publication number | Publication date |
---|---|
JPS6334583B2 (en) | 1988-07-11 |
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