SU22952A1 - Sound recorder - Google Patents

Description

The present invention relates to a device for recording sounds on a cinematographic film and consists in a constructive form of its implementation.

In FIG. 1 shows the power supply circuit of the proposed device; FIG. 2 is a schematic overview of it; FIG. 3 and 4 - respectively, the same as -fig. 1 and 2, but a slightly modified device.

Electromagnet 1 is powered by direct current from battery 12 and coil 3 is rotatable between its pole pieces, fed by a modulated current from the amplifying system (Fig. 1). With the coil 3, the screen 13 is rigidly fastened (Fig. 2), having a slit 2, bounded by parallel edges (Figs 1 and 2) or edges, converging at an acute angle (Figs. 3 and 4). The light from the source b passes through the lens 7, the slit 2, the optical system 9 and hits the cinematic film 10, fixed on it. Depending on the change in current strength in ka. carcass 3, the latter will oscillate with a greater or lesser amplitude near the axis AB, Together with it the screen 13 will come into oscillation and the screen 13 with a slit 2,

which at the same time will transmit a variable beam of light. Thus, the modulation of the current will correspond to the modulation of the beam of light, which will be applied to the film 10 when the latter moves, the sound film.

The subject matter of the invention.

1. A device for recording sound on a cinematographic film, characterized in that, in order to modulate light, a falling film is placed between the light source and the screen with a slit 2 rigidly connected to a coil 3 fed by a modulated sound frequency current and able to oscillate around an axis perpendicular to the direction of the magnetic field.

2. In the device described in paragraph 1, the use of slot 2, bounded by parallel ribs.

3. In an okharkterizov {- | nom in item 1 of the device, the use of a slot 2, bounded by edges that converge at an acute angle and having the shape of a narrow wedge. SHSh SH