SU1062775A1 - Light modulator for recording supervisory photographic sound tracks - Google Patents

Abstract

A LIGHT MODULATOR FOR ZAP OF PHOTOGRAPHIC CONTROL PHONOGRAMS containing successively fig f an established light source, a condenser, a slotted mask, a first lens, a movable mirror, a second lens, aperture diaphragm, and a microobjective, characterized in that, in order to improve the recording accuracy, the slotted The mask and the diaphragm are made in the form of two symmetrically diverging rectangular slots, perpendicular to which at opposite ends on the mask there are two additional rectangular slots, and between the second lens and a diaphragm valve inserted two-petalled repeated a configuration of the diaphragm slots to be alternatively they overlap,

Description

 The invention relates to sound recordings in cinematography, in particular, to devices for recording photographic sound track films of films.

A light modulator for recording photographic phonograms of rasters, used for monitoring and controlling sound-producing systems, is known, comprising a sequential light source, a condenser, a mask with a rectangular slot, a galvanometer with a lens depicting a slot with a mask in the plane of the mechanical slit, and a microscope lens.

This device allows you to record a reference phonogram used for the focus chains of a reading line of a sound-producing device, however, such a phonogram does not provide accurate control and indication of the position of the reading line relative to the film edge.

The closest to the invention to the technical essence and the achieved result is a light modulator for recording a photographic phonogram containing a successively located light source a condenser, a mask with a slit, a first lens, a galvanometer with a mirror, a second lens, and a diaphragm with a slit microobjective 2J.

A disadvantage of the known devices is the low accuracy of the recording of the test track, which in turn leads to a low accuracy of control and indexation of the reading and threes of the sound-producing device relative to the side edge of the film.

The aim of the invention is to improve the accuracy and reliability of recording of control photographic phonograms.

The goal is achieved by the fact that in a light modulator for recording photographic test phonograms containing a sequentially installed light source, a sensor, a mask with a slit, a first lens, a movable mirror, a second lens, a diaphragm with a slit and a micro lens, the slits on the mask are in the form two symmetrically diverging rectangular cuts, perpendicular to which at opposite ends on the mask there are two additional rectangular cuts, and between the second lens and the diaphragm dvuhlepestk introduced A new flap that repeats the configuration of the diaphragm slots with the possibility of their overlap.

FIG. 1 shows a functional block diagram of the modulator in FIG. 2 - mask

fig.Z - diaphragm; Fig; 4 part of the recorded photographic control phonogram.

The light modulator contains a light source 1, a condenser 2, a mask 3, a first lens 4, a movable mirror 5, a second lens b, a two-lobe flap 7, a diaphragm 8, a microstop 9, projecting an image onto a film 10 in the form of rasters 11 and indicator tracks 12, slots 13 and additional slots 14.

The device works as follows.

The image of the filament of the light source 1 is projected onto the movable mirror 5 of the mirror galvanometer (not shown) by the condenser 2 and the first lens 4. The torsional oscillation of the movable mirror 5 around the horizontal axis with the frequency of the recording signal causes the images of the mask slots 13 and 14 to move across the aperture 13 of the diaphragm 8 on which the mask image 3 is projected

5 lenses 4 and 6. The slot of the diaphragm 8 has a width equal to the width of the slot

13 masks, and a length equal to the total length of the prop. 13, the width of the slots

14 and the mask spacing between them, with Q considering the scale of reduction of the first 4

and second b lenses. The slits of the diaphragm 8 are located so that through them completely passes the image of the mask Duplex valve 7 has

g the possibility of alternately overlapping one of the slits of the diaphragm 8 with the frequency of changing the angle of inclination of the raster of the control dunogram.

On the film 10, a controgram of the phonogram is recorded in the form of length: 0 ditch 11, located at an angle about or p relative to each other. The rasters of the control phonogram are recorded on film in the recording area of the film’s phonogram and serve

5 to adjust the reading bar of the film projector. Using the slits 14 on the mask 3 with a length exceeding the width of its slit 13, the indicator tracks 12, located along the film, are arranged on different sides of rasters with different inclination.

The difference in the angle of inclination of the rasters, 5 of the control phonogram (for example, 2 °), makes it possible to adjust the position of the reading line of the film projector, its perpendicularity relative to the base edge of the film. In the case of a good adjustment of the reading line, when moving it from a raster of one slope to another, the return of the reproduced signal does not change. Indicator tracks 12 kits make it easier to determine the change in the angle of inclination of rasters when editing films with sound trackers.

The device provides recording of test phonograms in the form of alternating rasters without angular distortion, in addition, the recorded indicator tracks eliminate errors during installation of the control film and facilitate the work with it.

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FIG. 2

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Claims (2)

LIGHT MODULATOR FOR RECORDING PHOTO CONTROL PHONOS, containing a sequentially installed light source, con, sensor, a mask with a slot, a first lens, a movable mirror, a second lens, aperture with a slot, and a micro lens, characterized in that, in order to increase the accuracy of recording, a slot on the mask and the diaphragm are made in the form of two symmetrically diverging rectangular slots, perpendicular to which at the opposite ends on the mask are two additional rectangular slots, and between the second lens and the diaphragm gmoy introduced two-petalled damper on the configuration of the slits of the diaphragm with their * alternately overlap. ² V fig 1