GB1421865A - Cathode ray tube including a non-rotationally symmetrical electron-optical element - Google Patents
Cathode ray tube including a non-rotationally symmetrical electron-optical elementInfo
- Publication number
- GB1421865A GB1421865A GB1360473A GB1360473A GB1421865A GB 1421865 A GB1421865 A GB 1421865A GB 1360473 A GB1360473 A GB 1360473A GB 1360473 A GB1360473 A GB 1360473A GB 1421865 A GB1421865 A GB 1421865A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- control grid
- grid
- aperture
- lens
- 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
- H01J29/48—Electron guns
- H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
-
- 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
- H01J29/566—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses for correcting aberration
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
1421865 Cathode-ray tubes PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 21 March 1973 [24 March 1972] 13604/73 Heading H1D The electron gun of a cathode-ray display tube includes a cathode, control grid, acceleration anode, and a lens for focusing the beam, the control grid aperture being non-rotationally symmetrical, having major and minor axes of symmetry, and a smaller area than an ellipse having the same axial ratio and width, whereby to limit the effective emission area of the cathode to an oval portion and result in the production of an astigmatic beam, the lens being positioned to bring the beam to a focus with a predetermined axial ratio, As described, the apertures 11 and 14 in the control grid and the first anode 3, respectively, are orthogonally oriented diamond-lilo shapes, as shown, the control grid being disposed 125 microns from the surface of the dispenser cathode 1. The resulting beam is focused by the lens system 4,5,6, the diaphragm 18 with circular aperture 17 limiting the diameter of the beam and intercepting grid emission. Dimensions, spacings, and voltages for the various components are given. Reference is made to the alternative use of grid apertures in the form of two intersecting circular arcs, and to the use of the gun in an indexing type colour tube, in which the phosphor stripes are parallel to the major axis of the control grid aperture. The non-circular beam, by reducing the effect of space charge, permits reduced cathode loading.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7203931A NL7203931A (en) | 1972-03-24 | 1972-03-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1421865A true GB1421865A (en) | 1976-01-21 |
Family
ID=19815685
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1360473A Expired GB1421865A (en) | 1972-03-24 | 1973-03-21 | Cathode ray tube including a non-rotationally symmetrical electron-optical element |
Country Status (8)
Country | Link |
---|---|
US (1) | US3881136A (en) |
JP (1) | JPS4915359A (en) |
CA (1) | CA963069A (en) |
DE (1) | DE2311369A1 (en) |
FR (1) | FR2177860B3 (en) |
GB (1) | GB1421865A (en) |
IT (1) | IT980662B (en) |
NL (1) | NL7203931A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3018569A1 (en) * | 1979-05-18 | 1980-11-27 | Hitachi Ltd | ELECTRODE OF A COLORED TUBE ELECTRONIC SPIN, AND METHOD FOR THE PRODUCTION THEREOF |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3980919A (en) * | 1974-12-20 | 1976-09-14 | Watkins-Johnson Company | Rectangular beam laminar flow electron gun |
JPS5413249A (en) * | 1977-07-01 | 1979-01-31 | Hitachi Ltd | Cathode ray tube |
JPS54133070A (en) * | 1978-04-07 | 1979-10-16 | Hitachi Ltd | Constituent for electron gun |
US4172309A (en) * | 1978-07-21 | 1979-10-30 | Zenith Radio Corporation | Method of correcting deflection defocusing in self-converged color CRT display systems |
EP0014922A1 (en) * | 1979-02-22 | 1980-09-03 | International Standard Electric Corporation | Electron gun |
JPS5973439A (en) * | 1982-10-19 | 1984-04-25 | Nippon Steel Corp | Production of iron oxide from waste hydrochloric acid liquor for pickling |
JPS6199249A (en) * | 1984-10-18 | 1986-05-17 | Matsushita Electronics Corp | Picture tube apparatus |
NL8600463A (en) * | 1986-02-25 | 1987-09-16 | Philips Nv | CATHODE SPRAY TUBE WITH MEANS FOR VERTICAL STRETCH STRETCHING. |
US4724359A (en) * | 1986-10-17 | 1988-02-09 | General Electric Company | Laminar flow guns for light valves |
US8008632B2 (en) * | 2008-07-24 | 2011-08-30 | Seagate Technology Llc | Two-zone ion beam carbon deposition |
CN102975519B (en) * | 2012-02-21 | 2015-02-11 | 苑执中 | Born pair diamond certificate manufacture method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2840754A (en) * | 1954-09-01 | 1958-06-24 | Rca Corp | Electron beam tube |
NL219031A (en) * | 1956-09-07 | |||
NL6717635A (en) * | 1967-12-22 | 1969-06-24 | ||
US3579010A (en) * | 1968-10-31 | 1971-05-18 | Philco Ford Corp | Elongated aperture electron gun structure for flat cathode-ray tube |
-
1972
- 1972-03-24 NL NL7203931A patent/NL7203931A/xx unknown
-
1973
- 1973-03-08 DE DE19732311369 patent/DE2311369A1/en active Pending
- 1973-03-12 US US340051A patent/US3881136A/en not_active Expired - Lifetime
- 1973-03-15 CA CA166,958A patent/CA963069A/en not_active Expired
- 1973-03-21 GB GB1360473A patent/GB1421865A/en not_active Expired
- 1973-03-21 IT IT7367815A patent/IT980662B/en active
- 1973-03-22 FR FR7310297A patent/FR2177860B3/fr not_active Expired
- 1973-03-24 JP JP48033120A patent/JPS4915359A/ja active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3018569A1 (en) * | 1979-05-18 | 1980-11-27 | Hitachi Ltd | ELECTRODE OF A COLORED TUBE ELECTRONIC SPIN, AND METHOD FOR THE PRODUCTION THEREOF |
Also Published As
Publication number | Publication date |
---|---|
JPS4915359A (en) | 1974-02-09 |
US3881136A (en) | 1975-04-29 |
CA963069A (en) | 1975-02-18 |
NL7203931A (en) | 1973-09-26 |
FR2177860A1 (en) | 1973-11-09 |
FR2177860B3 (en) | 1976-03-19 |
IT980662B (en) | 1974-10-10 |
DE2311369A1 (en) | 1973-10-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |