GB425615A - Improvements in or relating to the construction of scanning discs for television, telecinematographic and like systems - Google Patents
Improvements in or relating to the construction of scanning discs for television, telecinematographic and like systemsInfo
- Publication number
- GB425615A GB425615A GB2564333A GB2564333A GB425615A GB 425615 A GB425615 A GB 425615A GB 2564333 A GB2564333 A GB 2564333A GB 2564333 A GB2564333 A GB 2564333A GB 425615 A GB425615 A GB 425615A
- Authority
- GB
- United Kingdom
- Prior art keywords
- television
- grains
- emulsion
- small size
- per cent
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/02—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only
- H04N3/04—Scanning details of television systems; Combination thereof with generation of supply voltages by optical-mechanical means only having a moving aperture also apertures covered by lenses
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Abstract
425,615. Photographic developing processes. WEST, A. G. D., and BAIRD TELEVISION, Ltd., 58, Victoria Street, London. Sept. 15, 1933, No. 25643. [Class 98 (ii)] [See also Group XL] In the production of a scanning-disc for television which comprises a glass or celluloid body carrying an emulsion with grains of small size, the apertures are formed photographically by a process either of reversal or of physical development. For ensuring image-grain of small size, a developer comprising paraphenylene diamine rendered alkaline with trisodium phosphate is used in a reversal process whereby the exposed portions of the emulsion are dissolved away and the unexposed portions are rendered opaque ; or alternatively the process of physical development is adopted. The developer referred to may comprise water, 1000 cc. ; p.p.diamine, 10 grains ; 10 per cent solution of trisodium phosphate, 20 cc. ; anhydrous sodium sulphate, 60 grains ; 10 per cent solution of potassium bromide, 10 cc. Final development may take place for 1 hour at 17 to 18‹ C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2564333A GB425615A (en) | 1933-09-15 | 1933-09-15 | Improvements in or relating to the construction of scanning discs for television, telecinematographic and like systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2564333A GB425615A (en) | 1933-09-15 | 1933-09-15 | Improvements in or relating to the construction of scanning discs for television, telecinematographic and like systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB425615A true GB425615A (en) | 1935-03-15 |
Family
ID=10230998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2564333A Expired GB425615A (en) | 1933-09-15 | 1933-09-15 | Improvements in or relating to the construction of scanning discs for television, telecinematographic and like systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB425615A (en) |
-
1933
- 1933-09-15 GB GB2564333A patent/GB425615A/en not_active Expired
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