GB639995A - Improvements in or relating to the formation of electrodes sensitised to be emittersof photo-electrons or secondary electrons - Google Patents
Improvements in or relating to the formation of electrodes sensitised to be emittersof photo-electrons or secondary electronsInfo
- Publication number
- GB639995A GB639995A GB184947A GB184947A GB639995A GB 639995 A GB639995 A GB 639995A GB 184947 A GB184947 A GB 184947A GB 184947 A GB184947 A GB 184947A GB 639995 A GB639995 A GB 639995A
- Authority
- GB
- United Kingdom
- Prior art keywords
- caesium
- photo
- antimony
- electric
- electrons
- 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
- H01J40/00—Photoelectric discharge tubes not involving the ionisation of a gas
- H01J40/02—Details
- H01J40/04—Electrodes
- H01J40/06—Photo-emissive cathodes
Abstract
639,995. Electrode materials and processing. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Jan. 21, 1947, No. 1849. [Class 39 (i)] Loss of sensitivity upon cooling of discharge devices, e.g. those devices including photoelectric electrodes and secondary electronemitting dynodes upon which a photo-electric substance and a metal have been caused to react or alloy by heating, is substantially reduced by depositing an additional quantity of a metal which reacts with the photo-electric material. A highly evacuated glass envelope has a photo-electric cathode on its inner surface and a plurality of nickel louvre dynodes arranged at intervals along the axis, antimony having been evaporated and condensed on the appropriate places followed by caesium. Those places upon which it is not desired to deposit are coated with material which absorbs caesium. The deposition is in the ratio of three parts caesium to one part antimony. After baking to alloy the materials, and removing excess caesium, an additional small quantity of antimony is evaporated selectively on to the photocathode which is additionally baked and if necessary superficially oxidized. Other alkali metals than caesium may be used and bismuth replaced by antimony. The known method of caesiating a silver oxide layer followed by deposition of silver is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB184947A GB639995A (en) | 1947-01-21 | 1947-01-21 | Improvements in or relating to the formation of electrodes sensitised to be emittersof photo-electrons or secondary electrons |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB184947A GB639995A (en) | 1947-01-21 | 1947-01-21 | Improvements in or relating to the formation of electrodes sensitised to be emittersof photo-electrons or secondary electrons |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB639995A true GB639995A (en) | 1950-07-12 |
Family
ID=9729082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB184947A Expired GB639995A (en) | 1947-01-21 | 1947-01-21 | Improvements in or relating to the formation of electrodes sensitised to be emittersof photo-electrons or secondary electrons |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB639995A (en) |
-
1947
- 1947-01-21 GB GB184947A patent/GB639995A/en not_active Expired
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