GB714718A - Improvements in or relating to cathode-ray apparatus - Google Patents
Improvements in or relating to cathode-ray apparatusInfo
- Publication number
- GB714718A GB714718A GB564/52A GB56452A GB714718A GB 714718 A GB714718 A GB 714718A GB 564/52 A GB564/52 A GB 564/52A GB 56452 A GB56452 A GB 56452A GB 714718 A GB714718 A GB 714718A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnet
- ferromagnetic material
- cathode
- jan
- anode
- 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.)
- Expired
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
- H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
- H01J29/845—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection by means of magnetic systems
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
714,718. Ion trapping in cathode ray tubes PHILIPS ELECTRICAL INDUSTRIES, Ltd. Jan. 8, 1952 [Jan. 11, 1951], No. 564/52. Class 39(1) The magnetic deflecting field of an ion trap is the stray field of a magnet located outside the tube envelope between the cathode and the ion trapping deflection point 15, Fig. 1, of the beam, preferably at the location shown by dotted lines 10, the beam being shielded from the direct field of the magnet by a tubular ferromagnetic screen 13. In alternative forms the anode 3 may be of ferromagnetic material, Fig. 4 (not shown), or electrodes 6, 3, 2 are of progressively decreasing diameter, and a tube of ferromagnetic material is supported on 6 and extends around 3 and 2, Fig. 5 (not shown). The ferromagnetic material may be iron or nickel and the ion trap magnet is a permanent one. The second anode 5, which traps the ions, is preferably bent as shown and may have a diaphragm at or near its left-hand end, Figs. 4, 5 (not shown). The main advantage of the invention is that the focusing coil 12 can be moved axially to extend right up to the deflection point 15, to allow more electrons to pass through aperture 8 and so to increase the range of contrast of the image. The focusing coil can be replaced by a permanent magnet.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL302333X | 1951-01-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB714718A true GB714718A (en) | 1954-09-01 |
Family
ID=19783347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB564/52A Expired GB714718A (en) | 1951-01-11 | 1952-01-08 | Improvements in or relating to cathode-ray apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US2727171A (en) |
| BE (1) | BE508323A (en) |
| CH (1) | CH302333A (en) |
| FR (1) | FR1048196A (en) |
| GB (1) | GB714718A (en) |
| NL (1) | NL158486B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL185006B (en) * | 1953-02-13 | Sentralinst For Ind Forskning | STEERABLE UNDERFRAME. | |
| US2903612A (en) * | 1954-09-16 | 1959-09-08 | Rca Corp | Positive ion trap gun |
| US3046936A (en) * | 1958-06-04 | 1962-07-31 | Nat Res Corp | Improvement in vacuum coating apparatus comprising an ion trap for the electron gun thereof |
| US3452233A (en) * | 1961-12-27 | 1969-06-24 | Rca Corp | Cathode ray tube |
| GB2122806B (en) * | 1982-06-17 | 1986-01-22 | Thor Cryogenics Ltd | X-ray source apparatus |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2131192A (en) * | 1934-05-09 | 1938-09-27 | Loewe Opta Gmbh | High vacuum television tube |
| DE689388C (en) * | 1934-07-30 | 1940-03-19 | Lorenz Akt Ges C | Arrangement for deflecting the cathode ray in Braun tubes |
| GB480948A (en) * | 1936-07-25 | 1938-02-25 | Frederick Hermes Nicoll | Improvements in or relating to cathode ray tubes |
| US2211613A (en) * | 1936-08-14 | 1940-08-13 | Hygrade Sylvania Corp | Cathode ray tube |
| BE442068A (en) * | 1940-07-03 | |||
| US2431077A (en) * | 1943-08-31 | 1947-11-18 | Rca Corp | Cathode-ray tube with revolving magnets and adjustable sleeve |
| US2460609A (en) * | 1946-01-24 | 1949-02-01 | Rca Corp | Beam aligning apparatus |
| US2555850A (en) * | 1948-01-28 | 1951-06-05 | Nicholas D Glyptis | Ion trap |
| US2622225A (en) * | 1948-12-31 | 1952-12-16 | Rca Corp | Electron beam device and system employing space charge neutralization |
| US2522872A (en) * | 1949-01-10 | 1950-09-19 | Heppner Mfg Company | Device for controlling the path of travel of electrons in cathoderay tubes |
| US2562243A (en) * | 1950-06-06 | 1951-07-31 | Du Mont Allen B Lab Inc | Electron gun structure |
| US2562242A (en) * | 1950-06-06 | 1951-07-31 | Du Mont Allen B Lab Inc | Split anode for bent gun ion trap cathode-ray tubes |
-
0
- NL NL7308348.A patent/NL158486B/en unknown
- BE BE508323D patent/BE508323A/xx unknown
-
1951
- 1951-12-21 US US262690A patent/US2727171A/en not_active Expired - Lifetime
-
1952
- 1952-01-08 GB GB564/52A patent/GB714718A/en not_active Expired
- 1952-01-09 CH CH302333D patent/CH302333A/en unknown
- 1952-01-09 FR FR1048196D patent/FR1048196A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2727171A (en) | 1955-12-13 |
| NL158486B (en) | |
| FR1048196A (en) | 1953-12-21 |
| BE508323A (en) | |
| CH302333A (en) | 1954-10-15 |
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