SU25751A1 - Device for recording sound on film - Google Patents

Description

When recording sounds on a film, all auxiliary mechanisms should have the greatest possible sensitivity, the absence of mechanical inertia and should not be sensitive to postponym jolts, etc.

The present invention aims to implement a device that meets all the aforementioned requirements.

In FIG. 1 shows a schematic side view of the device; FIG. 2 and 3 is a top and side view of a coil powered by an audio frequency current; FIG. 4 is a side view of a modified device; FIG. 5 is a top view of the coil of the device of FIG. five.

The device consists of a coil 1, which is supplied with an audio frequency to be recorded on a film strip 2. In front of the coil 1 there is a thin and short wiring 3 of soft iron fixed on rubber threads x 4, which pull it and protect it from for external shocks, which is important, for example, in shifters.

In view of the small geometric dimensions of the filament 3, magnetic hysteresis affects only at frequencies higher than sound, namely, from 15000 periods and above.

The thread 3 is located on the path of the light rays coming from the light source 5 through the lenses to the tape 2. When an audio frequency is passed through the coil I, the thread 3 will oscillate, causing tape 2 to record sound, in the form of strips, i.e. . audio recording will be transnereal.

The modified device (Fig. 4) is based on the fact that iron placed inside the solenoid is attracted to its walls, because the number of power magnetic lines near the walls of the solenoid is greater than in the center of it (Gumel principle).

The device consists of a coil 1 connected to the source of the recorded audio frequency with the help of terminals 2, 2 (Fig. 5).

Inside the coil 1 eccentrically located is a short and thin iron thread 3, also reinforced with rubber threads x 4.I

Wire 3 (Fig. 4) is located in the path of the beam of light rays coming from the light source 5 through the lenses 6 to the film strip 7. Depending on the magnitude of the audio frequency current, the wire 3 will pass a greater or smaller part of the light beam to the film strip.

The subject matter of the invention.

Claims (2)

1. Device for recording sound on | film, characterized by the use of thin and short rubber stretchable 4 wire 3 of soft iron, located in the path of the rays from the source 5 of light to the film strip 2 and on walking in the magnetic field created by the coil 1, fed by the current of the audio frequency. 2. The form of the device according to claim 1, characterized in that the wire 3 stretched by rubber yarn 4 and soft iron is placed inside the coil 1 eccentric with respect to its axis. FIG. f  FIG. 5. t.