DE426077C - Method and device for reproducing cinematographic films - Google Patents

Description

GERMAN EMPIRE

ISSUED MARCH 1, 1926

REICH PATENT OFFICE

PATENT LETTERING

CLASS 57a GROUP

(HgS6 ₉₄ IXl ₅₇ UV

Willi Hubert in Braunschweig.

Method and device for reproducing cinematographic films. Patented in the German Empire on September 30, 1924.

The invention relates to a reproducing apparatus for cinematography and The task is to make the picture tape, which is passed through the playback device many times will protect against the resulting damage, no matter, what number of images should be thrown on the screen per second.

This object is achieved according to the invention in that one is known per se Way arranged several playback devices on a common axis rotatably

Claims (4)

and that during the cinematographic reproduction of a process, the reproduction devices are rotated about the axis in such a way that a different reproduction device comes into operation with each image change. It is advantageous to arrange the devices in the wall of a common drum. For example, if the drum has eight devices and if sixteen images are to be reproduced per second, then each device would only have to carry out two image changes per second. The entire time between the swinging in and swinging out of the objective lens in a parallel plane opposite the screen is available for this image change, so that it is no longer necessary to move the film as quickly as before. It is advantageous to operate all display devices that can be rotated about a common axis by a single light source, since the individual images are then uniformly illuminated. Each device can also have its own condenser lens, which swings around the light source and cools down between every two images reproduced. You can drive the drum with a Maltese cross, by means of which it is stopped at the point in time at which the individual device reproduces its image. However, since great acceleration and braking forces have to act here, it is more advantageous to let the drum revolve evenly and, by means of optical compensation, throw a still image onto the screen with the uniformly revolving display device. This can be done by running the film and the lens j in the same direction, but the lens running more slowly than the film, in a manner known per se, or by moving the lens and the image in opposite directions. In the case of optical compensation, the image is then advanced at the point in time at which the objective lens swings into the parallel plane opposite the screen. The drawing shows an exemplary embodiment for a playback apparatus in which the individual devices are arranged in a common drum. In the drawing, α is the drum which is rotatable about the hollow axis b. c are playback devices without a light source, which are equipped with a roll-up chamber d and a roll-up chamber e in a manner known per se. / is a lever that works with a stop against the Maltese cross g that causes the image to advance. The lever / can also carry the stops with which the drive of the roller and e are actuated. // is the light source that acts through the condenser lenses / on the image and the screen. In order to prevent any scattering of the light, a funnel k is inserted between the condenser lens and the objective. The housing / enclosing the light source h is enclosed in a water bath. The drum a runs in the ball bearing on the hollow axis b in which the light source is located. The hollow axis b is fixedly mounted only on one of the two sides of the drum, so that the light source can be operated from the other side. Instead of the light source, a mirror can also be arranged inside the hollow axis and the light source outside the same. The use of the apparatus assumes that a corresponding number of films with a corresponding sequence of the individual images have been made during the recording. By swapping the films during playback, humorous films and cartoons can be shown on the screen in a wide variety of ways. Patent-A ν Proverbs: 1. Method for playing back cinematographic recordings using a plurality of playback devices, which are rotatable about a common axis, thereby characterized in that during the cinematographic playback one Process, the playback devices are rotated about the axis that each time a picture is changed, a different playback device comes into action. 2. playback apparatus for performing the method according to claim 1, characterized in that that the individual playback devices are arranged in a drum, which on one of the common Light source itself or one of these reflecting mirrors, which is fixed Hollow shaft rotates. 3. Playback apparatus according to claim 1, characterized in that the individual Films move in the opposite direction to the associated lenses during playback. 4. playback apparatus according to claim 1, characterized in that the individual Films move in the same direction as the lenses, but the lenses move in the same direction run slower like the movies. 1 sheet of drawings.