SU152173A1 - Vacuum cassette to a reproduction camera - Google Patents

Description

VACUUM CASSETTE TO REPRODUCTION PHOTO CAMERA

It was announced on May 30, 1962, № 780676 / 26-10

in the State Committee for Inventions and Discoveries of the USSR Published in the "Bulletin of inventions .Ua 23 for 1952

Vacuum cassettes to a reproduction camera are known, which contain a vacuum screen with holes and an air centrifugal electro turbine, directly attached to the cassette, which is mounted on a sliding carriage. The existing vacuum rarefaction of I etmx cassettes is not designed to hold a phototechnical nlenknn and contact raster. When laminating a phototechnical plepkn on a soft base, warping of the film can occur but also between the focal point,: the lens’s sharpness and the photo area of the airfoils. In addition, in well-known nrn cameras, the vacuum cassette is firmly fixed at high shutter speeds, it can vibrate.

In the proposed vacuum cassette to the re-animation camera designed for the production of the direct shooting method, with the aim of keeping the phototechnical image and the contact raster, the turbine opening area is equal to the sum of all the openings of the working part of the vacuum-screen focal plane. To eliminate the possibility of the occurrence between the focal nlosko the screen and the phototechnical film of air bubbles cassette equipped with a transparent apron nz viniproza. The softness of the cassette's fastening in the chamber and the exclusion of vibration are achieved by strengthening the cassette in the chamber on the shock absorbers.

FIG. 1 and 2 depict a vacuum cassette.

The vacuum cassette consists of a vacuum screen / on which small holes 2 are drilled, which serve to hold the phototechnical film 3 and a vacuum chamber with an electric turbine (there is no

No. 152173

shown), sucking air from the inside of the chamber. To work in a darkened-; The vacuum screen / painted black was placed in a red light, and for the convenience of orientation of the phototechnical film relative to the edges of the screen, red strips 4 are located on it, located diagonally across the screen.

The screen is equipped with hinged clamps-clamps 5. For better contact of the film 3 with the screen 7 and to avoid air "P5zrykov cassette" between them, it is equipped with a transparent apron made of viniproza, pressed to the screen surface with excessive atmospheric pressure. Ensuring soft fastening of the cassette in the chamber and elimination of vibration during long exposures is achieved by hanging the screen on the shock absorbers 6.

The vacuum cassette was made in the laboratory of the Central Research Institute of Geodesy, Aerial Photography and Cartography (TsNIIGA and K). Testing there also showed the suitability of the cassette for production operation.

Subject invention

Claims (3)

1.Vakuzum cassette to a reproduction camera, designed to produce a direct method of shooting with a contact raster, containing a vacuum screen with holes, an air centrifugal electric turbine, directly mounted on a cassette that is mounted on a movable carriage, characterized in that In order to retain the phototechnical film and the contact raster, the orifice area of the turbine is equal to the sum of the areas of all the orifices of the working part of the focal plane of the vacuum screen. 2. A vacuum cassette to the reproduction camera according to claim 1, characterized in that, in order to better contact the photo cells with the raster and to eliminate air bubbles from them, the cassette is provided with a transparent apron made of viniprosis. 3. Vacuum cassette to a reproduction camera in PP. 1 and 2. characterized in that, in order to ensure its soft fastening in the chamber and to avoid vibration, the movable carriage is provided with shock absorbers.