GB521853A - Apparatus for the reversal of pictures by an electrical process - Google Patents
Apparatus for the reversal of pictures by an electrical processInfo
- Publication number
- GB521853A GB521853A GB34482/38A GB3448238A GB521853A GB 521853 A GB521853 A GB 521853A GB 34482/38 A GB34482/38 A GB 34482/38A GB 3448238 A GB3448238 A GB 3448238A GB 521853 A GB521853 A GB 521853A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cell
- scanning
- screen
- negative
- cathode
- 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
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
521,853. Local copying by scanning. I. G. FARBENINDUSTRIE AKT.-GES. Nov. 26, 1938, No. 34482. Convention date, Nov. 29, 1937. [Class 40 (iii)] Apparatus for the reversal of pictures comprises a cathode-ray tube B, Fig. 1, the light from the screen F passing through the negative film N, thereby scanning it point by point, to a photo-cell Z which controls by means of the device R and amplifier V the intensity of, or the speed of scanning by, the cathode ray beam so that the quantity of light falling on the cell Z from all points of the picture is substantially the same, a positive of the negative N.appearing on the screen F. The control device R comprises a bridge circuit Z, r<SP>1</SP>, r<SP>2</SP>, rv, Fig. 2. arranged to control the grid-cathode potential in accordance with the light incident on the cell Z. To adjust the gradation of the reversed picture the resistance rv, or a suitable part in the amplifier V, is made variable, or an interchangeable screen may be placed between the negative N and the cell Z. Alternatively the cell Z may be arranged to control the frequency of the time base circuit KG, thus influencing the speed of line scanning.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE521853X | 1937-11-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB521853A true GB521853A (en) | 1940-06-03 |
Family
ID=6551487
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB34482/38A Expired GB521853A (en) | 1937-11-29 | 1938-11-26 | Apparatus for the reversal of pictures by an electrical process |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB521853A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2315033B2 (en) * | 1972-03-25 | 1975-11-20 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) | IMAGE DISPLAY DEVICE |
-
1938
- 1938-11-26 GB GB34482/38A patent/GB521853A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2315033B2 (en) * | 1972-03-25 | 1975-11-20 | Matsushita Electric Industrial Co., Ltd., Kadoma, Osaka (Japan) | IMAGE DISPLAY DEVICE |
DE2315033C3 (en) * | 1972-03-25 | 1977-04-14 | Matsushita Electric Ind Co Ltd | IMAGE DISPLAY DEVICE |
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