US1714443A - Pneumatic vibrating capsule - Google Patents

Description

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Faiented, May 21, 1929'.

LAMBERTO 'ymnsoiir ARTURO fn'iimriiialv, or Boivin, ITALY.'

rimaniamo mamme .CAPs-Um?.

.application-siga epm as, i927, sernam.' 187,321, and is .Germany api-i1 4, i927.

The present invention has 'for itsobject a device consisting of a Casin in which vibrations are transmitted by air, particularly applicable to the photographic recording of sounds and characterized'by the fact that the vibrations of a metallic diaphragm which is subjected to the influence of an electromagnet the coils of which are traversed by the current-s either amplified or not,

to coming from afm-ierophone, are transmitted to a second diaphragm which is non-metallic, and forms a mirror for reflecting every pencil otv light rays which strikes upon it, this transmission being effected by means of l l5 a layer of: air interposed between the two vibrating diaphragms.

The acconipanying drawing shotvs diagrainmatieally, and in section through the axis, the casino' which is the object of the invention; it illustrates si-multaneousljr what manner a pencil l,of light is thrown upon the vibratincr mirror for-the purpose of its reflection -or the photographie recording of the-vibrations of the said mirror.

' 25 As will be seen from the drawing, the

casing which is the object of `the invention,

comprises a box 1in which the electromagnet 2 is housed, the'coils 3 of Which'are traversed by a current coming from a microphone which receivesthe sounds, which current may be amplified by any suitable means; the polar .horns 4 and 5 of ltheelectromagnet 2 are located close to the metallic diaphragm 6 and their posi-tion with relation to this diaphragm can be regulated.

The diaphragm 6 closes the open portion of the box 1; it. rests i'ipon the shoulders 7 of this box with the intervention of a ringA 8 of, for example, rubber; a lid 10. 'crewed 4o upon the box l, forms an zii-r Chamb ir.

Thelid 10 is provided at its centre with an .orifice 11 and is. in communication -by means of a tubular portion 12, with the' small case 13 intended lto receive the second diaphragm. The `whole devicefornied by the lidlO, the tubular portion 12 'and the case 13 is rigid and the lid 10 is pierced by sev.- eral capillaryliol'es 14 the function of which vwill be explained hereafter. 5o The case 13 contains the Vdiaphragm inii" roi- 15; this diaphragm is made 'of a plate of glass or mica of several hundredths of a millimet're of thickness and is quicksilvered- K/or silvered,so that its external Asurface, -fornis a mirror; it is secured in the case 13 in the reieclte optical system 22 which imparts to .the pencil 9o Alieight -of the phi)togra'ni; it--will be 'readily of the dimensions of the section of the pencil same way as in the diaphragm 6, that is to say, its edges are resiliently held between two .thicknesses 16 and 17 made ofany suitableV material, for example rubber, -and'held in position by the ring 18 screwed upon the 60 case 13.

The cavity comprised between the diaphragm 6 and thelid 10, the tube lil-and the cavity comprised between the-bottom of the case 13 and the diaphragm 15 form an air 55 chamber, havingr no communication with the atmosphere except through the capillary holes 14.

The vibrations of the diaphragm 6, v'hich result from the variations of the current cir-A 7.0 culating in thercoilfs of the electromagnet 2 cause successive depressions Aand eonipres sions of varying vamplitudes in the air contained in the chamber described above; these oscillations, the inertia of which is damped by the air' evacuated o r drawn in'throughV theholes 114-, are pneumatically transmitted to the diaphragm mirror 15 vwhich refiects them whilstelimina-ting the paiasiti'ca vis-fie brations arising from-.the inertia of the diaphragin (i.-

A. pencil' of light,'.emanating -rom any suitable source and vdirected by the lens 19, passes through a condenser 20 the position of which is regulated iii such a 'manner that 85. the apex ,-21 of the cone of lightvwhich it projects isloeated precisely at the .centre of the d-iapihragm mirrorl; .this cone of light,

' bythe mirror, passes through an' suitable 4dimens'ions 'so that, -vv'hether it falls directly onthe 'recording film 23, or Whether it only reaches the -latterat-er refieetion from -a prism 24 or from .a mirror, its sec- `tion in the Apla-ne of the film corresponds vto 9a v the height of a' hotogram,"this. being in order that, when tiie-recording 'of the sounds is effected' upon the fixed lm by means :of a 'ray of li'ght'tr'aversing--a movable slot, such record-ing may be eli'ected 'over the total understood that `the positions of the optical system` 22 and, eventual-ly, of Vthe prism 24, are regulable, so as toallow this adjustment of light in the plane .of 'the recording vlm.

23; i The vibrations of the diaphragm -nri-rror,

modifying at each instant the luminous inf tensfty per 'unit Vof .surtaxe in the pencil 'of 110 ight are recordedvphobographicaily upon the It will be readily understood that 'the necessity of imparting to the pencil of light rays in the plane of the film, a-section the .diameter of which' is at least .e ual to the height of, a photo sentialvex'cept in trhease of recording upon a cinematographic film which moves intermittently, and that, if the photographic recording of the sounds is effected upon n strip which 1s given continuous motion, this condition is not necessary. v

The pneumatic vibration Casin which is' the object of the invention, may e applied not only for the photographic recording of sounds on strips or films but it may also be employed lin all industries, laboratories, etc. for recordin an vibratory motions, Whatever the origin o the latter may be.

According to its particular conditions of employment, the casing which is the object of the invention, may undergo modifications,

both in the relative positions ofthe members which it comprises ,and in the dimen- Gram, does not ecome es sions-and nature of the latter without how-` Y' g -eveig-.aectin'g :the spirit 'of the invention.

We .claim i A device for use in the photogmphic recording of vibrntions of all kinds',A com-ris'- `ing a easing, an `elec'troznagnet iocate. in

said casing, a resiiientlygmounted primary da hragm -i-nfiuen-cedby said -eiect-romagnet an extending across the: mouth of 'said casing, a cover can to said casing, said cover cap being pierced witli capil'lmy air-holes and having o tubular portion connecting two 'flanged portions of larger diameter, one of said finnged portions extending across the prim-ery diaphragm, a secondary diaphragm having a reiecting surface and supported resi-liently within the other Hanged portion of saridcover'caud a transparent 'closing' cap for said other Iiiing'ed portion of the cover cap, substantially :is described.

In testimony whereof we have-signedour names to this specification.

LAMBERTO PINESCHIQ Ani-'Uno communi'.

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