GB1308113A - Cathode-ray tube - Google Patents
Cathode-ray tubeInfo
- Publication number
- GB1308113A GB1308113A GB2660871A GB2660871A GB1308113A GB 1308113 A GB1308113 A GB 1308113A GB 2660871 A GB2660871 A GB 2660871A GB 2660871 A GB2660871 A GB 2660871A GB 1308113 A GB1308113 A GB 1308113A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- circular
- provision
- plate
- spot
- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
-
- 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
- H01J29/48—Electron guns
Abstract
1308113 Cathode ray tubes PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 19 April 1971 [11 April 1970] 26608/71 Heading H1D An electron gun in a display tube comprising a cathode 6, a first control grid 7, a second accelerating grid 8 and a third grid 9, is characterized by the provision of an astigmatic lens element. In Fig. 2 the lens element comprises two spaced-apart semi-circular plates 16 and 17 on the plate part 13 of the second grid on either side of a circular aperture 14. At low beam currents the beam spot on the screen is thereby elongated vertically so that the line structure is less apparent; at high beam currents the spot is circular, the larger spot being sufficient to mask the line structure and any elongation would reduce definition. In a modification, Fig. 6 (not shown), the plate 13 is covered with a circular plate provided with a central rectangular aperture. In another arrangement, Fig. 7 (not shown), the plate 13 is provided with a rectangular bulge extending towards the first grid. Other arrangements mentioned are the provision of non-circular beam apertures in either the second or third grids, or the provision of slots in cylindrical parts of the second or third grids surrounded by electrodes at different potentials. In a shadow mask-type colour display tube Moire patterns may be prevented in this way.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7005233A NL162783C (en) | 1970-04-11 | 1970-04-11 | IMAGE DISPLAY DEVICE AND ELECTRON BEAM AS A PART thereof. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1308113A true GB1308113A (en) | 1973-02-21 |
Family
ID=19809829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2660871A Expired GB1308113A (en) | 1970-04-11 | 1971-04-19 | Cathode-ray tube |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5318866B1 (en) |
| AT (1) | AT303840B (en) |
| BE (1) | BE765604A (en) |
| BR (1) | BR7102106D0 (en) |
| CA (1) | CA918220A (en) |
| CH (1) | CH518619A (en) |
| DE (1) | DE2114310C3 (en) |
| ES (1) | ES390059A1 (en) |
| FR (1) | FR2089503A5 (en) |
| GB (1) | GB1308113A (en) |
| NL (1) | NL162783C (en) |
| SE (1) | SE366425B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073275C (en) * | 1996-06-11 | 2001-10-17 | 株式会社日立制作所 | Color cathode ray tube |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7607722A (en) * | 1976-07-13 | 1978-01-17 | Philips Nv | ASTIGMATIC ELECTRON LENS, CATHOD RAY TUBE WITH SUCH LENS AND DEVICE WITH SUCH CATHOD RAY TUBE. |
| NL175002C (en) * | 1977-11-24 | 1984-09-03 | Philips Nv | CATHODE JET TUBE WITH AT LEAST AN ELECTRON GUN. |
| NL178374C (en) * | 1977-11-24 | 1986-03-03 | Philips Nv | ELECTRON RADIUS TUBE WITH NON-ROTATION SYMETRIC ELECTRON LENS BETWEEN FIRST AND SECOND GRID. |
| EP0014922A1 (en) * | 1979-02-22 | 1980-09-03 | International Standard Electric Corporation | Electron gun |
| JPS6187521A (en) * | 1985-10-12 | 1986-05-02 | 松下電器産業株式会社 | Production of filter of electric cleaner |
| JPH09259787A (en) * | 1996-03-19 | 1997-10-03 | Hitachi Ltd | Color cathode-ray tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4828952A (en) * | 1971-08-21 | 1973-04-17 |
-
1970
- 1970-04-11 NL NL7005233A patent/NL162783C/en active
-
1971
- 1971-03-24 DE DE19712114310 patent/DE2114310C3/en not_active Expired
- 1971-04-05 CA CA109545A patent/CA918220A/en not_active Expired
- 1971-04-07 BR BR210671A patent/BR7102106D0/en unknown
- 1971-04-07 SE SE458671A patent/SE366425B/xx unknown
- 1971-04-08 ES ES390059A patent/ES390059A1/en not_active Expired
- 1971-04-08 AT AT299971A patent/AT303840B/en not_active IP Right Cessation
- 1971-04-08 CH CH520171D patent/CH518619A/en not_active IP Right Cessation
- 1971-04-08 JP JP2145071A patent/JPS5318866B1/ja active Pending
- 1971-04-09 BE BE765604A patent/BE765604A/en unknown
- 1971-04-09 FR FR7112787A patent/FR2089503A5/fr not_active Expired
- 1971-04-19 GB GB2660871A patent/GB1308113A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073275C (en) * | 1996-06-11 | 2001-10-17 | 株式会社日立制作所 | Color cathode ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2114310A1 (en) | 1971-10-28 |
| NL162783B (en) | 1980-01-15 |
| CA918220A (en) | 1973-01-02 |
| AT303840B (en) | 1972-12-11 |
| ES390059A1 (en) | 1973-06-01 |
| JPS5318866B1 (en) | 1978-06-17 |
| SE366425B (en) | 1974-04-22 |
| CH518619A (en) | 1972-01-31 |
| FR2089503A5 (en) | 1972-01-07 |
| BR7102106D0 (en) | 1973-05-17 |
| NL7005233A (en) | 1971-10-13 |
| BE765604A (en) | 1971-10-11 |
| NL162783C (en) | 1980-06-16 |
| DE2114310C3 (en) | 1978-07-06 |
| DE2114310B2 (en) | 1977-11-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |