GB579804A - Improvements in or relating to photo-electrically active electrodes - Google Patents
Improvements in or relating to photo-electrically active electrodesInfo
- Publication number
- GB579804A GB579804A GB15088/40A GB1508840A GB579804A GB 579804 A GB579804 A GB 579804A GB 15088/40 A GB15088/40 A GB 15088/40A GB 1508840 A GB1508840 A GB 1508840A GB 579804 A GB579804 A GB 579804A
- Authority
- GB
- United Kingdom
- Prior art keywords
- base
- edge
- cathode
- junction
- unraised
- 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
- H01J29/02—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
- H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/50—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output
- H01J31/505—Image-conversion or image-amplification tubes, i.e. having optical, X-ray, or analogous input, and optical output flat tubes, e.g. proximity focusing tubes
Landscapes
- Gas-Filled Discharge Tubes (AREA)
- Common Detailed Techniques For Electron Tubes Or Discharge Tubes (AREA)
Abstract
579,804. Electron discharge apparatus. ELECTRIC & MUSICAL INDUSTRIES, Ltd., and LUBSZYNSKI, H. G. Oct. 10, 1940, No. 15088. [Class 39 (i)] An electric circuit includes an electron discharge device having a cathode comprising a conducting base with an electron-emissive coating, the base having contiguous raised and unraised portions and the raised portion declining gradually in the neighbourhood of the junction between the two portions down to the unraised portion, the device being operated with such field intensity at the cathode that in the absence of such gradual decline excessive concentration of the field would occur at the junction and produce unwanted emission of electrons. As shown, a mica sheet 1 carries a conductive base 2 for a photo-cathode, which base may comprise a transparent layer of silver evaporated or otherwise coated on the mica. In order to attach a lead 3, the periphery 4 of the base is thickened, the edge of the thickened portion being formed as a bevel 7 extending down to the unraised portion 2, thereby avoiding sharp edges at the junction, which would result in concentration of the lines of force and unwanted electron emission, producing a bright ring on the fluorescent screen 6. The thickening of the edge 4 may be effected by masking the portion 2 and evaporating silver past the edge of the mask, and the bevelled edge 7 may be produced by spacing the mask from the base so that the evaporated silver creeps below the edge.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL66228D NL66228C (en) | 1940-10-10 | ||
| US2563474D US2563474A (en) | 1940-10-10 | Electron emissive cathode | |
| GB15088/40A GB579804A (en) | 1940-10-10 | 1940-10-10 | Improvements in or relating to photo-electrically active electrodes |
| FR932899D FR932899A (en) | 1940-10-10 | 1946-08-27 | Improvements relating to electron-emitting cathodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB15088/40A GB579804A (en) | 1940-10-10 | 1940-10-10 | Improvements in or relating to photo-electrically active electrodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB579804A true GB579804A (en) | 1946-08-16 |
Family
ID=10052811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15088/40A Expired GB579804A (en) | 1940-10-10 | 1940-10-10 | Improvements in or relating to photo-electrically active electrodes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2563474A (en) |
| FR (1) | FR932899A (en) |
| GB (1) | GB579804A (en) |
| NL (1) | NL66228C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2594740A (en) * | 1950-02-17 | 1952-04-29 | Forest Lee De | Electronic light amplifier |
| US2783407A (en) * | 1952-06-28 | 1957-02-26 | Vierkotter Paul | Source of light |
| US3058022A (en) * | 1959-04-14 | 1962-10-09 | Radiation Res Corp | Photoelectric generator |
| DE1281053B (en) * | 1965-02-25 | 1968-10-24 | Telefunken Patent | Process for the production of a planar photocathode for photoelectric tubes |
| US3940620A (en) * | 1974-10-03 | 1976-02-24 | General Electric Company | Electrostatic recording of X-ray images |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1921834A (en) * | 1929-08-17 | 1933-08-08 | G M Lab Inc | Photo-electric tube |
| US2115855A (en) * | 1935-05-23 | 1938-05-03 | Emi Ltd | Cathode ray tube |
| US2175888A (en) * | 1936-12-31 | 1939-10-10 | Rca Corp | Photoelectric cathode |
-
0
- US US2563474D patent/US2563474A/en not_active Expired - Lifetime
- NL NL66228D patent/NL66228C/xx active
-
1940
- 1940-10-10 GB GB15088/40A patent/GB579804A/en not_active Expired
-
1946
- 1946-08-27 FR FR932899D patent/FR932899A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL66228C (en) | |
| FR932899A (en) | 1948-04-05 |
| US2563474A (en) | 1951-08-07 |
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