GB1270531A - An improvement in or relating to photographic printing - Google Patents
An improvement in or relating to photographic printingInfo
- Publication number
- GB1270531A GB1270531A GB276168A GB276168A GB1270531A GB 1270531 A GB1270531 A GB 1270531A GB 276168 A GB276168 A GB 276168A GB 276168 A GB276168 A GB 276168A GB 1270531 A GB1270531 A GB 1270531A
- Authority
- GB
- United Kingdom
- Prior art keywords
- negative
- filter
- motor
- light
- 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
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
- G03B27/02—Exposure apparatus for contact printing
- G03B27/14—Details
- G03B27/16—Illumination arrangements, e.g. positioning of lamps, positioning of reflectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection-Type Copiers In General (AREA)
Abstract
1,270,531. Photo-copying. C. BARBER, J. F. FARROW and D. E. CLAFTON. April 18, 1969 [Jan. 18, 1968], No.2761/68. Heading G2A. In a photo-copying apparatus and method, the whole area of the negative to be copied is illuminated, light from the negative falling on photosensitive material 12 which acts as a diffuser, passing light into a recess 54 containing a photocell 56 which controls the exposure time, an exposure being terminated by interposing a filter 58 for actinic light between the negative and the material 12. In this way, the exposure time is dependent on the average density of the negative. Sequence of Operations. The light-sensitive material 12 and the negative strip are fed step by step in unison so that the first negative is beneath the light source. (In a semi-automatic apparatus, the first negative is positioned manually). At this stage, the filter 58 is in the position shown, to allow of focusing without exposure, and paper masks 72 are set for the required aperture size. Depression of a start button starts a motor 66 to raise the filter 58 so that the material 12 is exposed. As stated above, the photo-cell 56 controls the exposure time by association with a condenser which discharges on reaching a pre-set level. This reactuates the motor 66 to lower the filter 58, and operates a motor 38 to advance the paper 12 by a distance equal to the circumference of an O ring carried by a shaft 30. After one rotation of the shaft 30 the motor 38 is stopped by means of a cam 34. A guillotine 52 is provided by an exit slot 50. The apparatus is then ready to copy the next negative.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB276168A GB1270531A (en) | 1968-01-18 | 1968-01-18 | An improvement in or relating to photographic printing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB276168A GB1270531A (en) | 1968-01-18 | 1968-01-18 | An improvement in or relating to photographic printing |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1270531A true GB1270531A (en) | 1972-04-12 |
Family
ID=9745405
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB276168A Expired GB1270531A (en) | 1968-01-18 | 1968-01-18 | An improvement in or relating to photographic printing |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1270531A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2154052A (en) * | 1984-02-02 | 1985-08-29 | Fiamm Spa | Battery top-up and venting device |
-
1968
- 1968-01-18 GB GB276168A patent/GB1270531A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2154052A (en) * | 1984-02-02 | 1985-08-29 | Fiamm Spa | Battery top-up and venting device |
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