RU1788505C - Cine film projection method - Google Patents

Abstract

Usage: film technology. SUMMARY OF THE INVENTION: the method is that the switching on of the pulsed light source during the projection of the film is carried out from synchronizing pulses obtained from the marks applied to the film at the same time as it was exposed when shooting the film. For this, both the projection movie camera and the filming system use an additional optical system to create synchronizing marks on the film and their illumination, which contains a light source, a condenser, a slit diaphragm, a deflecting mirror and a micro lens. In addition, the micro lens in the movie projector is optically coupled through a synchronizing tag with a photo sensor electrically connected to a flash cinema projection lamp. 5 ill.

Description

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The invention relates to film technology, specifically to the technology of filming and film projection of films and can be used in high quality cinema based on an increase in the frequency of filming and film projection.

A known film projection method is implemented in the Shouscan cinematic system, in which the filming and projection frequencies are 60 frames / s.

This frequency of film projection exceeds the critical flicker frequency, therefore, film projection is carried out with a single shutter overlay of the cinema projector frame window during the projection of one frame. In this system, the quality of transmission of image motion in the cinema is significantly improved, however, with this projection method in this

the system exhibits distortion in the form of vertical image instability.

Closest to the technical nature of the image is a method of projection of a film, carried out using a pulsed source during continuous motion of a film copy in a film projector. With this projection method, the inclusion of a pulsed light source comes from synchronizing pulses transmitted from perforations of a film. However, this method cannot provide sufficient vertical stability of the image on the movie screen, since when filming and printing errors are made in the arrangement of frames on the film copy relative to the perforations of the ng film. Therefore, this method of film projection does not give a significant increase in the stability of the image on the screen.

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The aim of the invention is to improve the quality of projection by reducing the vertical instability of the frame.

This goal is achieved by the fact that in the method of projection of a film, which consists in the inclusion of a pulsed light source from synchronizing pulses during continuous movement of the film, the inclusion of a pulsed light source is carried out from synchronizing pulses obtained from marks applied to the film at the same time exposure when shooting.

In FIG. 1, 2 depict views, respectively, of the negative and positive films used in this method of film projection; in FIG. 3 is a diagram of a movie camera implementing the method; in FIG. 4 shows a section AA in FIG. 3; on Fig, 5 shows a diagram of a projection apparatus that implements this projection method.

The method is implemented as follows.

When filming is carried out by a conventional filming apparatus with intermittent motion of the film, synchronized marks are applied to it in places not occupied by the image and the phonogram. For example, these marks can be applied behind the perforation track (Fig. 1). Since the marks are applied simultaneously with the exposure of the film frame, this ensures absolutely precise spatial reference of each mark to the corresponding film negative frame.

In the subsequent process for creating a photocopy when printing intermediate positive, countertype and photocopy, synchronization marks are printed simultaneously with the image. As a result, synchronization marks are formed on the photocopies (Fig. 2), precisely linked to the respective frames of the photocopy. Moreover, the accuracy of the arrangement of the frames themselves on the film copy can be relatively low.

The filming apparatus used to implement the method comprises (Fig. 3) a filming lens 1. mirror 2, a micro lens 3, aperture diaphragm 4, a capacitor 5, an incandescent lamp 6, a film channel 7 with a frame window 8 and a disk shutter 9.

During filming, film 10 is moved intermittently by a clamshell mechanism (not shown) in film channel 7. The film-shooting lens 1 builds an image of the captured object on film 10 while it is standing in film channel 7. During movement of film 10, the obturator 9 overlaps the frame window 8.

Simultaneously with the exposure of the film 10, synchronization marks are applied to it. In order to apply synchronizing marks in the design of the film camera, a special optical illumination system is provided (Fig. 3). An incandescent lamp 6 illuminates the slit aperture 4 through a capacitor 5. Using a mirror 2 and a micro lens 3, the slit aperture 4 is depicted in the plane of film 10 located in film channel 7. Simultaneously expose film 10 in the frame window 8 and at the location of the slit aperture 4 takes place during standing motion picture 10 in a movie

0 channel 7, since during the movement of the film 10, the obturator 9 simultaneously blocks the light stream 8 coming from the incandescent lamp 6. Instead of the incandescent lamp 6, you can also use a pulsed lamp that is switched on from a synchronizing pulse supplied from a sensor located on shutter shaft or grab mechanism, during the standing of the film 10 in the film channel 7.

The film projection is carried out by a film projector with a continuous motion of a film copy and a pulsed light source

The film projection apparatus (Fig. 5) contains a mirror 11, a micro lens 12, a slit diaphragm 13, a condenser 14, an incandescent lamp 15, a photo sensor 16, a film channel 17 with a frame window 18, a film projection lens 19, a reflector 20, and a flash projection lamp 21.

During the film projection, the film copy 22 moves continuously in the film channel 17. An incandescent lamp 15 through the condenser 14 illuminates the slotted diaphragm 13.

5 The mirror 11 and the micro lens 12 build an image of the slit aperture 13 in the plane of the photocopy 22 in the area where the synchronization marks are located. When past the image of the slit diaphragm 13 passes

0 next sync mark, light from the lamp. 15 enters the photosensor 16. The latter generates a synchronizing pulse, which, after amplification and conversion, is applied to the pulse

5, a projection lamp 21 and ignites it, Light. the flow from the lamp 21 is directed by the Reflector 20 to the frame window 18 located in the film channel 17, and the film projection lens 19 projects the next frame

on the movie screen (not shown). The flash time of the projection lamp 21 should not exceed the travel time by the allowable shift amount of the film copy 22.

Due to the fact that each synchronizing pulse is precisely mapped to the corresponding film frame, the absolute vertical stability of the image will be ensured during film projection on the screen.

The implementation of this method of projection of films will not only improve the quality of film projection, but will also give a significant economic effect, since with continuous film projection the service life of film copies is much higher compared to intermittent transportation.

This method, moreover, will make it possible to make a photocopy without perforations required in existing systems to ensure image stability on a movie screen. Moving Photocopies

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can be carried out in a film projector by a friction film copy transport system. Therefore, the thickness of the base of the film can be reduced by

compared with the existing two to three times. The absence of perforations will reduce the wear of the film copy when demonstrated in a film projector and will reduce the width of the film strip.

Claims (1)

The claims The method of projection of a movie, which consists in the inclusion of a pulsed light source from synchronizing pulses with continuous moving a movie, characterized in that, in order to improve the quality of the projection by reducing the vertical instability of the frame, the inclusion of a pulsed light source is carried out from sync pulses obtained from marks applied to the film at the same time as the film fitStfuMOtfffffi / jr pt / .2