GB859895A - Improvements in or relating to apparatus for photographic printing - Google Patents
Improvements in or relating to apparatus for photographic printingInfo
- Publication number
- GB859895A GB859895A GB891658A GB891658A GB859895A GB 859895 A GB859895 A GB 859895A GB 891658 A GB891658 A GB 891658A GB 891658 A GB891658 A GB 891658A GB 859895 A GB859895 A GB 859895A
- Authority
- GB
- United Kingdom
- Prior art keywords
- scanning
- tube
- transparency
- copying
- sawtooth generator
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
- G03B27/725—Optical projection devices wherein the contrast is controlled electrically (e.g. cathode ray tube masking)
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
859,895. Copying-by-scanning. RANK CINTEL Ltd. March 20, 1959 [March 20, 1958], No. 8916/58. Drawings to Specification. Class 40(3). In an arrangement for copying a photographic . transparency by directing light from a flying-spot cathode-ray scanning tube through the transparency on to photographically sensitive material and thence on to a photo-electric cell the signals produced by which control the intensity of the tube scanning beam in a negative sense to effect a marking control, a timing device is employed to ensure that a desired integral number of complete scanning cycles of the tube are effected for each copying operation. In this manner under exposure of part of the copy image which would result if the scanning terminated during part of a complete cycle is prevented. The timing device may comprise an adjustable sawtooth generator which controls the scanning tube sawtooth generator which operates at the lower of the two co-ordinate deflection rates, the arrangement being such that, at the termination of a desired integral number of cycles of the scanning generator, a pulse initiated by the adjustable sawtooth generator either suppresses the tube beam or closes an electromagnetically released shutter in the optical path between the tube screen and the transparency..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB891658A GB859895A (en) | 1958-03-20 | 1958-03-20 | Improvements in or relating to apparatus for photographic printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB891658A GB859895A (en) | 1958-03-20 | 1958-03-20 | Improvements in or relating to apparatus for photographic printing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB859895A true GB859895A (en) | 1961-01-25 |
Family
ID=9861796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB891658A Expired GB859895A (en) | 1958-03-20 | 1958-03-20 | Improvements in or relating to apparatus for photographic printing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB859895A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612382A (en) * | 2015-12-31 | 2017-05-03 | 北京数科技有限公司 | Method and device for acquiring static images |
-
1958
- 1958-03-20 GB GB891658A patent/GB859895A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612382A (en) * | 2015-12-31 | 2017-05-03 | 北京数科技有限公司 | Method and device for acquiring static images |
| CN106612382B (en) * | 2015-12-31 | 2023-06-30 | 北京一数科技有限公司 | Method and device for collecting static image |
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