SU785834A1 - Light-optical system for motion-picture film printing apparatus of continuous printing of photographic phonograms - Google Patents

Description

Union of Soviet

Socialist

Republics

USSR State Committee for Inventions and Discoveries

DESCRIPTION OF THE INVENTION (>> 785834 TO AUTHOR'S CERTIFICATE (61) Additional to author certificate woo _ (22) 3Approved 05.03.79 (21) 2732826 / 18-10 (51) M. Cl ³ with the attachment of application No. - G 03 B 27/72 (23) Priority - Published on December 7th, 1980. Bulletin No. 45 (53) UDC771.43 Date of publication of the description: 1Q12.80 (088.8)

(7.2) The inventors N. A. Vasiliev, A. M. Kuritsyn and N. A. Khrapak ** ·· * '...... G; - ’..“ (71) Applicant All-Union Scientific and Research Film and Photo Institute

(54) LIGHT OPTICAL SYSTEM

FOR FILM COPIER OF CONTINUOUS CONTACT PRINTING PHOTOGRAPHIC PHONOGRAMS

The proposal relates to the field of film technology and relates to the design of film copiers) in particular, lighting systems for the continuous contact printing unit for photographic phonograms. ⁵

Known optical systems of illuminators of the phonogram print unit, containing a light source and a condenser depicting a light source at infinity, a rotary mirror and a lens, projecting the exit pupil of the condenser into the plane of the printing window (1].

A disadvantage of these systems is uneven lighting printed _(print window, which increases with a decrease, sheniem aperture diaphragm used for illumination changes in the print window Due iris increases depth of field of the lens _m ive print window is displayed not only uniformly equipped with the exit pupil of the condenser, but and the space between the light source glow body and this pupil, in which there are light and dark stripes, due to the discrete structure of the light source glow body.

The closest technical solution to the proposed one is a light-optical system for printing phonograms containing a light source ', a condenser, a mask and a lens depicting a mask in the plane of the film U1. )

The aim of the proposal is to improve the levels and uniformity of the distribution of illumination in the plane of the print line.

A light-optical system containing a light source, a mask, and a lens projecting a mask through a window in the printed frame of the gear drum into the plane of the film is equipped with a light guide installed between the light source and the mask, the input end of which is located in close proximity to the light source.

The drawing shows an optical diagram of the inventive device. The light source 1 illuminates the input end 2, ₅ located at a distance of 1-2 mm from the light source 1, of a rectangular prismatic optical fiber 3. As a result of multifaceted reflections of light rays in the optical fiber 3, its output end 4 10 is uniformly illuminated. The mask 5, located at the output end 4, is projected by the lens 6 through the window 7 in the printing frame 8 of the gear drum 9 onto the plane of the film 10 in the form of a printed line 15 15. The blue filter 12 is placed between the mask 5 and the lens 6. The angle of divergence of the output light beam θί.4 'is determined by the apparatus {^ of lens 6 and can be made sufficiently 20 small. Using the light guide 3 to transmit light from the light source 1 to the mask 5 projected by the lens 6 into the plane of the film 10 allows to obtain higher illumination levels 25 in the dash plane (up to 500,000 lux) compared to a condenser lighting system with light sources of equal power due to the maximum approaching the input end 2 of the light guide 3 30 to the light source 1; to increase the uniformity of the distribution of illumination in the plane of the print line 11, since the influence of the discrete structure of the filament body, which takes place in illuminators with a condenser in a light-optical system, on the quality of lighting is fundamentally eliminated.

Claims (1)

Claim A light-optical system for a film copier for continuous contact printing of photographic phonograms containing a light source, a mask and a lens projecting the mask through a window in the printed frame of the gear drum into the film plane,. On the one hand, I join with the fact that, in order to increase the levels and uniformity of illumination in the plane of the print line, it is equipped with. a wife installed between the light source and the mask by the light guide, the input end of which is located in close proximity to the light source.