SU669317A1 - Apparatus for continuous contact printing of photographic phonograms of 16 and 8mm film copies - Google Patents

Description

(54) DEVICE FOR CONTINUOUS CONTACT PRINTING OF PHOTOGRAPHIC PHONOGRAMS OF 16 AND 8 MM FILMICOPY

I

This invention relates to film photographic equipment, namely, photocopiers.

Devices for continuous contact printing of phonograms of 32 film copies are known, containing a printing drum on which the support flange is located between the phonogram tracks and has a width equal to the distance between them, and the optical axis of the lighting system is oriented symmetrically relative to the phonogram tracks and coincides with the center line of the reference flange 1 .

However, the noise level, especially at the extreme track, remains rather high, which greatly reduces the quality of the soundtrack.

Devices are known for continuous contact printing of photographic phonograms of 16 and 8 mm trumpets containing a printing drum with flanges mounted on its axis, whose bearing surfaces are made with a ring gear, a printing frame with exposure windows opposite the photographic phonograms and the lighting system 2. The illumination is characteristic of these devices and the lack of reliable contact of films throughout the top.

The purpose of the invention is to improve the printing quality of photographic phonograms.

This is achieved by the fact that a light guide is inserted into the lighting system, installed between the flanges and made in the form of two right-angled prisms and one triangular between their adjacent ends, angled to each other, and the width of the supporting surface of each of the flanges corresponds to the distance between the exposures windows printed frame.

FIG. 1 is a diagram of a device for printing photographic phonograms on a film of format 32 (2 X 16) mm; in fig. 2 - section along the axis of the OO; in fig. 3 is an isometric view.

Claims (2)

The device consists of a lighting system with a light source 1, a light filter 2, a condenser 3 and a light guide from two rectangular 4 and triangular 5 prisms, a printing drum 6 with flanges 7 whose width of the bearing surface corresponds to the distance between the exposure windows 8 of the printing frame 9. Device works as follows. The light flux from the light source 1, the light filter 2, the condenser 3, the light conductor does not enter the exposure window 8. The condenser creates a real image of the light source 1 at infinity, therefore the light conductor operates with a constant aperture angle and captures the light flux, the magnitude of which is the same for any of light conduits and is determined only by the brightness of the exit pupil of the condenser 3. The angle of divergence of the output light is determined by the angular dimensions of the light source 1 relative to the main plane of the condenser 3 and can be made small enough. The rectangular prisms 4 with the deviation of the upp angle φ are located relative to the horizontal axis 10 of the drum 6 at an angle di in order to circumvent the costructive cuts of the axis 10 of the printing drum 6, with flanges 7 fixed on it. The refractive angle of the prisms 4 is calculated so that the direction of the axial beam of the light beam emerging from them was kept parallel to the vertical axis O O of the printing drum 6. To eliminate losses in the fracture region, a rectangular prism 5 is glued in between the rectangular prisms 4, and its coefficient is refracted It is selected on the basis of obtaining the same angle of incidence of light at the interfaces between the two glasses when the light passes from one light guide to the other and while maintaining the direction of the axial beam, the output n: 1 of its light beam with the incident and parallel axis of the illuminator. The light guide from the prism system is rigidly mounted in cassettes that are inserted between cylindrical ribs. The device is equipped with a mechanism for clamping films consisting of an endless wide belt belt 11 with grooves (not shown in Fig.), Under the teeth of the drum 6. The belt 11 is installed with the necessary tension on two or more freely rotating rollers 12 mounted on a movable plate ( Fig. not shown). When the film 13 is moving, the endless clamping motion starts to move, and constant pressure on the film is applied. The size of the clamp is adjusted by the position of the belt 11 relative to the film 13 by changing the angle of coverage and the tension of the belt 11 on the rollers 12. The device significantly improves the quality of light when the light is perpendicular to the film at the print site when using printing drums having the required number of cylindrical support points. that are on the same axis with the ring gear of the drum, so that only the exposed portion does not rest on the supporting surfaces, and the rest of the width of the film is supported. The use of a tape rolling clamp eliminates the deflection of the negative and its damage on the printed frame. Thanks to these features, the exposure window is as close as possible to the exposed areas of the film, eliminating light scattering. Printed Schtrich has a clear light area. The device greatly improves the print quality of the phonograms, especially on the extreme tracks, bringing them closer to the quality of the first track. Apparatus of the Invention A device for continuous contact printing of photographic phonograms. 16 and 8 mm print copies containing a printing drum with flanges mounted on its axis, whose bearing surfaces are made with a ring gear, a printing frame with exposure windows opposite to photographic phonograms and a lighting system characterized by that, in order to improve the print quality of photographic phonograms, a light guide was inserted into the lighting system, installed between the flanges and made in the form of two at an angle to each other, rectangular prisms and one triangular between their adjacent ends, and the width of the support surface of each of the flanges corresponds to the distance between the exposure windows of the printing frame. Sources of information taken into account in the examination 1. USSR author's certificate number 377718, cl. G 03 B 27/32. 2. Technical conditions I2PO-6 instead of TU 1434-64, UEZ group, 1969.