GB481170A - Improvements in or relating to electron discharge devices - Google Patents
Improvements in or relating to electron discharge devicesInfo
- Publication number
- GB481170A GB481170A GB24404/36A GB2440436A GB481170A GB 481170 A GB481170 A GB 481170A GB 24404/36 A GB24404/36 A GB 24404/36A GB 2440436 A GB2440436 A GB 2440436A GB 481170 A GB481170 A GB 481170A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emission
- aluminium
- electrode
- oxide
- electron
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 9
- 239000004411 aluminium Substances 0.000 abstract 4
- 229910052782 aluminium Inorganic materials 0.000 abstract 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 4
- 229910052783 alkali metal Inorganic materials 0.000 abstract 3
- 150000001340 alkali metals Chemical class 0.000 abstract 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 2
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 229910052760 oxygen Inorganic materials 0.000 abstract 2
- 239000001301 oxygen Substances 0.000 abstract 2
- FRWYFWZENXDZMU-UHFFFAOYSA-N 2-iodoquinoline Chemical compound C1=CC=CC2=NC(I)=CC=C21 FRWYFWZENXDZMU-UHFFFAOYSA-N 0.000 abstract 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052790 beryllium Inorganic materials 0.000 abstract 1
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 abstract 1
- LTPBRCUWZOMYOC-UHFFFAOYSA-N beryllium oxide Inorganic materials O=[Be] LTPBRCUWZOMYOC-UHFFFAOYSA-N 0.000 abstract 1
- 229910052792 caesium Inorganic materials 0.000 abstract 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical compound [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 238000010894 electron beam technology Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 238000007689 inspection Methods 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract 1
- 239000000395 magnesium oxide Substances 0.000 abstract 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 abstract 1
- 229910052710 silicon Inorganic materials 0.000 abstract 1
- 239000010703 silicon Substances 0.000 abstract 1
- 229910052814 silicon oxide Inorganic materials 0.000 abstract 1
- 229910052844 willemite Inorganic materials 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
- H01J9/125—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes of secondary emission electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/32—Secondary-electron-emitting electrodes
-
- 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
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/43—Charge-storage screens using photo-emissive mosaic, e.g. for orthicon, for iconoscope
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2201/00—Electrodes common to discharge tubes
- H01J2201/32—Secondary emission electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
481,170. Electric discharge devices. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 7, 1936, Nos. 24404 and 24405. Convention dates, Sept. 6, 1935 and. April 30, 1936. [Class 39 (i)] A secondary-electron-emitting electrode consists of a thin substantially insulating film or coating on a conductive surface, the film &c. being sensitized to produce a high emission of secondary electrons. The film &c. may consist of (a) aluminium oxide on an aluminium surface, (b) beryllium oxide on beryllium, (c) magnesium oxide on magnesium, (d) silicon oxide on silicon, or (e) Willemite on a conducting material; in all of these examples the surface may be sensitized with an oxide of an alkali metal such as caesium. The film of aluminium oxide is formed electrolytically and only sufficient alkali metal is used to form a sub-microscopic coating. The coated electrode is baked at 200‹ C. for ten minutes and oxygen is admitted. It is stated that the baking of an oxidized aluminium electrode and the introduction of oxygen, without alkali metal, produces a surface giving a considerable emission of secondary electrons. It is suggested that the positive charge left on the surface of the insulating film owing to the emission of secondary electrons, causes an attraction of electrons *from the aluminium surface and from the aluminium oxide film which shoot through the positively-charged surface. The emission persists for an appreciable time after the primary electron beam is cut off ; energization of the surface by light as well as by a primary beam reduces the secondary emission. The ratio of secondary emission to primary emission is of the order 3000. In the multiplier shown in Fig. 1, the secondary-electron-emitting electrode 7 is mounted at the apex of a V- or Y-shaped envelope 1, a photo-electric cathode 3 and an output electrode 5 being mounted in the arms, and the electron streams focused magnetically by windings 15, 17 or electrostatically. The multiplier shown in Fig. 4 has, during manufacture, a thin glass diaphragm 77 dividing the envelope to form a compartment 73 containing a secondary-electron-emitting electrode 79 and an output electrode 81, and a compartment 75 containing a photo-electric electrode 83 and two focusing electrodes 85, 87. After the electrodes 79, 83 have been sensitized separately, the diaphragm is broken by a metal ball 97. British Specifications 460,356, 469,477, and U.S.A. Specification 1,450,265 are referred to. The Specification as open to inspection under Sect. 91 includes also the use of a mosaic target, in a cathode-ray tube, formed of aluminium particles sensitized in the manner already referred to and scanned by a fine point of light. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US481170XA | 1935-09-06 | 1935-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB481170A true GB481170A (en) | 1938-03-07 |
Family
ID=21952831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB24404/36A Expired GB481170A (en) | 1935-09-06 | 1936-09-07 | Improvements in or relating to electron discharge devices |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE704087C (en) |
| FR (1) | FR810432A (en) |
| GB (1) | GB481170A (en) |
| NL (1) | NL47272C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2464420A (en) * | 1943-12-31 | 1949-03-15 | Rca Corp | Storage type cathode-ray tube |
| DE857535C (en) * | 1939-08-08 | 1952-12-01 | Telefunken Gmbh | Impact electrode for secondary electron multiplication |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE750000C (en) * | 1938-08-17 | 1944-12-12 | Process for the production of a layer of high secondary emissivity | |
| DE919896C (en) * | 1942-03-24 | 1954-11-08 | Fernseh Gmbh | Arrangement for storing electrical charges over long periods of time |
| US2700626A (en) * | 1949-12-09 | 1955-01-25 | Bell Telephone Labor Inc | Secondary electron emissive electrodes |
-
0
- NL NL47272D patent/NL47272C/xx active
-
1936
- 1936-07-21 DE DE1936R0096881 patent/DE704087C/en not_active Expired
- 1936-08-31 FR FR810432D patent/FR810432A/en not_active Expired
- 1936-09-07 GB GB24404/36A patent/GB481170A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE857535C (en) * | 1939-08-08 | 1952-12-01 | Telefunken Gmbh | Impact electrode for secondary electron multiplication |
| US2464420A (en) * | 1943-12-31 | 1949-03-15 | Rca Corp | Storage type cathode-ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| DE704087C (en) | 1941-03-22 |
| FR810432A (en) | 1937-03-22 |
| NL47272C (en) |
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