JPS55155448A - Focus magnet - Google Patents
Focus magnetInfo
- Publication number
- JPS55155448A JPS55155448A JP6237179A JP6237179A JPS55155448A JP S55155448 A JPS55155448 A JP S55155448A JP 6237179 A JP6237179 A JP 6237179A JP 6237179 A JP6237179 A JP 6237179A JP S55155448 A JPS55155448 A JP S55155448A
- Authority
- JP
- Japan
- Prior art keywords
- ring
- yoke
- center
- around
- yoke plate
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/64—Magnetic lenses
- H01J29/68—Magnetic lenses using permanent magnets only
Abstract
PURPOSE:To enable an adjustment of a center of magnetic field with ease, by providing a yoke plate at each side of a magnet unit and disposing a ring around said yoke plates. CONSTITUTION:Cylindrical ferrite magnets 1 and 1' stand face to face via a ferromagnetic spacer 2, and a magnetic shunt steel 3 is fixed around said ferrite magnets 1 and 1' to restrain alternation of the center field intensity due to temperature variation. A yoke plate 5 is fixed on each side of a magnet unit 4 and a ring 6 is provided around the outer peripheries of the yoke plates 5. The field intensity at a center P of the yoke can be adjusted by rotating the ring 6 and adjusting the distance W between the front end of the ring 6 and the front yoke plate 5.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6237179A JPS55155448A (en) | 1979-05-21 | 1979-05-21 | Focus magnet |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6237179A JPS55155448A (en) | 1979-05-21 | 1979-05-21 | Focus magnet |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55155448A true JPS55155448A (en) | 1980-12-03 |
Family
ID=13198185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6237179A Pending JPS55155448A (en) | 1979-05-21 | 1979-05-21 | Focus magnet |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55155448A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5848343A (en) * | 1981-09-18 | 1983-03-22 | Hitachi Ltd | Focusing magnetic field generator |
US5469017A (en) * | 1992-03-27 | 1995-11-21 | Thomson Tubes & Displays, S.A. | Permanent magnet focus unit with integral astigmatism corrector |
US5528211A (en) * | 1992-01-10 | 1996-06-18 | Thomson Tubes And Displays, S.A. | Magnetic focusing device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5032565A (en) * | 1973-07-26 | 1975-03-29 | ||
JPH112869A (en) * | 1997-06-10 | 1999-01-06 | Sony Corp | Desk stand screen |
-
1979
- 1979-05-21 JP JP6237179A patent/JPS55155448A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5032565A (en) * | 1973-07-26 | 1975-03-29 | ||
JPH112869A (en) * | 1997-06-10 | 1999-01-06 | Sony Corp | Desk stand screen |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5848343A (en) * | 1981-09-18 | 1983-03-22 | Hitachi Ltd | Focusing magnetic field generator |
US5528211A (en) * | 1992-01-10 | 1996-06-18 | Thomson Tubes And Displays, S.A. | Magnetic focusing device |
US5469017A (en) * | 1992-03-27 | 1995-11-21 | Thomson Tubes & Displays, S.A. | Permanent magnet focus unit with integral astigmatism corrector |
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