GB538021A - Cathode ray tube devices - Google Patents
Cathode ray tube devicesInfo
- Publication number
- GB538021A GB538021A GB749/40A GB74940A GB538021A GB 538021 A GB538021 A GB 538021A GB 749/40 A GB749/40 A GB 749/40A GB 74940 A GB74940 A GB 74940A GB 538021 A GB538021 A GB 538021A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- cathode
- modulating
- emission
- ray tube
- 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
- H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation
Abstract
538,021. Cathode-ray tubes. ELECTRICAL RESEARCH PRODUCTS, Inc. Jan. 12, 1940, No. 749. Convention date, Feb. 8, 1939. [Class 39 (i)] The modulating electrode of a Braun tube is situated next to the cathode and is positively biased with respect thereto, the beam is concentrated by a negatively biased electrode and focused by a tubular anode of the usual type. It is stated that the arrangement may be such that the displacement of the focus due to the changes in potential of the modulating electrode compensate for the departure from linearity of the relation of the cathode emission to the modulating anode voltage. The cathode 19 may be of the indirectly heated type and surrounded by a screen 20 to diminish the emission of electrons to the positively biased control electrode 12. Between the electrode 12 and the tubular anode 14 is the negatively biased electrode 13. An example of dimensions and voltage is given.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US255226A US2260313A (en) | 1939-02-08 | 1939-02-08 | Cathode ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB538021A true GB538021A (en) | 1941-07-17 |
Family
ID=22967390
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB749/40A Expired GB538021A (en) | 1939-02-08 | 1940-01-12 | Cathode ray tube devices |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US2260313A (en) |
| FR (1) | FR863045A (en) |
| GB (1) | GB538021A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR959703A (en) * | 1941-07-08 | 1950-04-04 | ||
| US2986668A (en) * | 1957-12-23 | 1961-05-30 | Gen Dynamics Corp | Cathode ray tube optical system |
| US3202864A (en) * | 1961-05-26 | 1965-08-24 | Bell Telephone Labor Inc | Electron beam device having divergent emission electron gun |
| US5220239A (en) * | 1991-12-09 | 1993-06-15 | Chunghwa Picture Tubes, Ltd. | High density electron beam generated by low voltage limiting aperture gun |
| US5159240A (en) * | 1991-12-09 | 1992-10-27 | Chunghwa Picture Tubes, Ltd. | Low voltage limiting aperture electron gun |
| US5223764A (en) * | 1991-12-09 | 1993-06-29 | Chunghwa Picture Tubes, Ltd. | Electron gun with low voltage limiting aperture main lens |
| US5327044A (en) * | 1992-04-27 | 1994-07-05 | Chunghwa Picture Tubes, Ltd. | Electron beam deflection lens for CRT |
| US5204585A (en) * | 1992-04-27 | 1993-04-20 | Chen Hsing Yao | Electron beam deflection lens for color CRT |
| US5182492A (en) * | 1992-05-20 | 1993-01-26 | Chunghwa Picture Tubes, Ltd. | Electron beam shaping aperture in low voltage, field-free region of electron gun |
-
1939
- 1939-02-08 US US255226A patent/US2260313A/en not_active Expired - Lifetime
-
1940
- 1940-01-12 GB GB749/40A patent/GB538021A/en not_active Expired
- 1940-01-24 FR FR863045D patent/FR863045A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2260313A (en) | 1941-10-28 |
| FR863045A (en) | 1941-03-21 |
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