SU34172A1 - Light Recording Device - Google Patents

Description

There are already known devices for light recording of sounds, with an incandescent lamp serving as a source of modulated light, with a light filter filtering off the unmodulated region of the spectrum, and a direct current is applied to the incandescent lamp on which the modulated current is superimposed.

According to the present invention, in the above-mentioned device, an electric lamp is provided with a device for reducing thermal inertia by increasing heat removal from the filament.

In FIG. 1 shows a device diagram; FIG. 2 curves of its sensitivity; FIG. 3 and 4 side view of incandescent (gas) lamp; FIG. 5 is a view from above; FIG. b and 7, front and side view of a modified lamp.

In a vessel 4 with water (Fig. 1), a bulb 2 of an incandescent lamp with a filament 5, surrounded by gas, is placed. The light from the filament 5 passes through the filter 5, the slit valve 7 and is projected through the lens 8 onto the film 9 in the form of a dash. The thread is connected to the high voltage battery circuit through a resistance, and the choke 77. The talk current is supplied from the secondary winding of the transformer / through the capacitor 10,

(411)

Thanks to the choke and the resistance, the light filter 5 is designed FOR: absorbing and screening the unmodulated part of the spectrum, resulting in an overall modulation depth increasing with a very small perekalena strand 5 (the change in the filament temperature is proportional to the fifth degree of light intensity). The recording thus obtained on tape 9 does not have frequency distortions (common in oscilloscopes). However, due to the thermal inertia of the filament of the lamp, there is a slight increase in the sensitivity of the device in the low tone region and its decrease in the high tone region (Fig. 2, curve ai).

To eliminate this drawback, an electric incandescent lamp (Fig. 3-5) was used in the device, in which a filament was placed in the gas-filled flask 7- f. connected to clips 5 and b and supported by a series of mica ribs 3, perpendicular to the direction of the thread and fixed on a massive base 2. Thus, thanks to the ribs 3, the filament 4 is divided into sections, which ensures sufficient cooling . Another embodiment of the lamp is shown in FIG. 6 and 7 In this case

3 a flask / system is placed, consisting of solid mica, plate 5 and end clamping clips 3, between which the filament 4 is fixed, so that it simultaneously adjoins the mica plate. The contact of the thread with the plate in a significant number of points also ensures its sufficient cooling.

According to the authors, the decrease in thermal inertia is also partially accomplished by appropriate selection of the capacitor 10, and the sensitivity of the device can be expressed as direct cd.

The subject matter of the invention.

1. A device for light recording of sounds using a direct current-fed incandescent lamp as a source of modulated light.

ya which is myworm-1 and tdK # as well as using a sieve filter for screening out unmodulated volume; Spectral range, characterized in that said electric radiation lamp is equipped with a device for reducing thermal inertia by increasing heat dissipation from the filament.

2. The design of the device described in paragraph 1, characterized in that the filament 4 baptized into the gas-filled flask is located on the mica plate 5 and is tightly pressed to the latter by means of the end clamps 3.,

3. the implementation of the device described in claim 1, characterized in that the filament 4 placed in the gas-filled flask is propped up by a series of mica ribs 3 perpendicular to the Hanpfling of the thread and fixed on the massive base 2)

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copyright certificate V.D. Okhotnikov and A. G. MoshEovich № 34172

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