GB546846A - Improvements in cathode-ray tubes - Google Patents
Improvements in cathode-ray tubesInfo
- Publication number
- GB546846A GB546846A GB8280/41A GB828041A GB546846A GB 546846 A GB546846 A GB 546846A GB 8280/41 A GB8280/41 A GB 8280/41A GB 828041 A GB828041 A GB 828041A GB 546846 A GB546846 A GB 546846A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- electrode
- diameter
- tube
- july
- 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
-
- 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
- H01J29/94—Selection of substances for gas fillings; Means for obtaining or maintaining the desired pressure within the tube, e.g. by gettering
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
546,846. Cathode-ray tubes. HAZELTINE CORPORATION. July 1, 1941, No. 8280. Convention date, July 25, 1940. [Class 39 (i)] In a cathode ray tube the thermionic cathode 26, Fig. 2, is surrounded by a control electrode 14 whose external diameter is less than 0.15 times the internal diameter of the first anode 17; this may fit into the glass neck 11 of the tube or be a coating of colloidal graphite. The end of the electrode 14 may fall short of or project beyond the plane at the end of the anode 17 and perpendicular to the tube axis. Further magnetic or electro-static focusing means are used to direct the beam on to a fluorescent screen. The cathode is held by a steatite plug 27 in the electrode 14, which is mounted in the coned insulator 23; stiff rods 25 passing through holes in the insulator form supports therefor and act as leads. A getter 32 is housed in the cone. In a modification the cathode 26, Fig. 3, is held in the electrode 14 by spacing discs 35, the electrode having a perforated cap 33. The internal diameter of the electrode may be between 1-5 to 3 times the diameter of the cathode diameter; the aperture 30 in the electrode may be ¢ to ¥ the cathode diameter.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US347389A US2295038A (en) | 1940-07-25 | 1940-07-25 | Cathode-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB546846A true GB546846A (en) | 1942-07-31 |
Family
ID=23363503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8280/41A Expired GB546846A (en) | 1940-07-25 | 1941-07-01 | Improvements in cathode-ray tubes |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US2295038A (en) |
| FR (1) | FR873959A (en) |
| GB (1) | GB546846A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1028450A1 (en) * | 1999-02-11 | 2000-08-16 | Marconi Medical Systems, Inc. | Getter for use in evacuated tube envelopes |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2592242A (en) * | 1946-07-02 | 1952-04-08 | Gen Electric | Electron gun and mounting therefor |
-
0
- US US22275D patent/USRE22275E/en not_active Expired
-
1940
- 1940-07-25 US US347389A patent/US2295038A/en not_active Expired - Lifetime
-
1941
- 1941-07-01 GB GB8280/41A patent/GB546846A/en not_active Expired
- 1941-07-02 FR FR873959D patent/FR873959A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1028450A1 (en) * | 1999-02-11 | 2000-08-16 | Marconi Medical Systems, Inc. | Getter for use in evacuated tube envelopes |
| US6192106B1 (en) | 1999-02-11 | 2001-02-20 | Picker International, Inc. | Field service flashable getter for x-ray tubes |
Also Published As
| Publication number | Publication date |
|---|---|
| USRE22275E (en) | 1943-02-23 |
| US2295038A (en) | 1942-09-08 |
| FR873959A (en) | 1942-07-24 |
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