JPS5482162A - Magnetic focus cathode-ray tube - Google Patents
Magnetic focus cathode-ray tubeInfo
- Publication number
- JPS5482162A JPS5482162A JP14937277A JP14937277A JPS5482162A JP S5482162 A JPS5482162 A JP S5482162A JP 14937277 A JP14937277 A JP 14937277A JP 14937277 A JP14937277 A JP 14937277A JP S5482162 A JPS5482162 A JP S5482162A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- center part
- ray tube
- small
- increased
- 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 reduce the spherical aberration with a small caliber magnet by giving a large thickness at the center part and a small thickness at the both edge parts of the electron beam condensing cylindrical magnet which is distributed at the neck part of a cathode-ray tube.
CONSTITUTION: Permanent magnet 7 of a small caliber featuring a cylindrical form and being magnetized in the axial direction is districuted inside neck part 3 of cathode-ray tube in order to condense the electron beams. In this case, the thickness of magnet 7 is increased (t3) at the center part and decreased at the both end parts (t1, t2) with the length increased in the axial direction respectively. Thus, the magnet features a shape in that the center part swells toward the tube axis. As a result, such magnetic flux distribution can be obtained that the wide and effective focusing function region is ensured for the spherical aberration like a large-caliver magnet and unlike the magnetic flux distribution featuring the reduced magnetic field at the magnet center part in case a small-caliber cylindrical magnet is increased just in the length.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14937277A JPS5482162A (en) | 1977-12-14 | 1977-12-14 | Magnetic focus cathode-ray tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14937277A JPS5482162A (en) | 1977-12-14 | 1977-12-14 | Magnetic focus cathode-ray tube |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5482162A true JPS5482162A (en) | 1979-06-30 |
Family
ID=15473686
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14937277A Pending JPS5482162A (en) | 1977-12-14 | 1977-12-14 | Magnetic focus cathode-ray tube |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5482162A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5026274U (en) * | 1973-07-03 | 1975-03-26 |
-
1977
- 1977-12-14 JP JP14937277A patent/JPS5482162A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5026274U (en) * | 1973-07-03 | 1975-03-26 |
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