GB906146A - Improvements in or relating to photographic printing - Google Patents
Improvements in or relating to photographic printingInfo
- Publication number
- GB906146A GB906146A GB741560A GB741560A GB906146A GB 906146 A GB906146 A GB 906146A GB 741560 A GB741560 A GB 741560A GB 741560 A GB741560 A GB 741560A GB 906146 A GB906146 A GB 906146A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- transparency
- gun
- multiplier
- photo
- 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
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
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)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
906,146. Copying by scanning. ILFORD Ltd. May 2, 1961 [March 2, 1960], No. 7415/60. Class 40 (3). A photographic dodging system employs a direct view storage type of cathode-ray tube as light source. The writing gun 1 of a storage tube scans the fluorescent screen 2 to produce a raster which is focused on a transparency 6. Light passing transparency 6 and the printing material 7 is received by a photo-multiplier 9, the output of which is fed back through an amplifier 10 to the writing gun 1 to produce a negative image of transparency 6 on screen 2. A corresponding charge image is formed on the target screen 3, and when the flood gun 4 is switched on, a negative image of enhanced brightness appears on screen 2. In modifications, material 7 may be out of contact with transparency 6 during the writing period, and replace the photo-multiplier when the flood gun is switched on or light may be directed to the photo-multiplier by a mirror, which may be semi-transparent. Differences in size between the initial and secondary images are compensated by moving the lens 5 nearer screen 2 before switching on the flood gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB741560A GB906146A (en) | 1960-03-02 | 1960-03-02 | Improvements in or relating to photographic printing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB741560A GB906146A (en) | 1960-03-02 | 1960-03-02 | Improvements in or relating to photographic printing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB906146A true GB906146A (en) | 1962-09-19 |
Family
ID=9832687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB741560A Expired GB906146A (en) | 1960-03-02 | 1960-03-02 | Improvements in or relating to photographic printing |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB906146A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2507337A1 (en) * | 1981-06-05 | 1982-12-10 | Logetronics Inc | DEVICE FOR AUTOMATIC ADJUSTMENT OF DENSITY AND CONTRAST, AS WELL AS EXPOSURE FOR PHOTOGRAPHIC PRINTING |
-
1960
- 1960-03-02 GB GB741560A patent/GB906146A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2507337A1 (en) * | 1981-06-05 | 1982-12-10 | Logetronics Inc | DEVICE FOR AUTOMATIC ADJUSTMENT OF DENSITY AND CONTRAST, AS WELL AS EXPOSURE FOR PHOTOGRAPHIC PRINTING |
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