US1806598A - denoux - Google Patents

Description

May 26, 1931. DENOUX 1,806,598

ACOUSTIC RECEIVER Filed Dec. 19, 1929 2 Sheets-Sheet 1 May 26, 1931. R. DENOUX ACOUSTIC RECEIVER Filed Dec. 19, 1929 2 Sheets-Sheet 2 Patented May 26, 1931 UNITED STATES RENE DENOUX, 0F PARIS, FRANCE ACOUSTIC RECEIVER Application filed December 19, 1929, Serial No. 415,321, and in France July 6, 1929.

My invention relates to improvements in acoustic receivers of the type used in connection with phonographs, loud-speakers, and analogous instruments.

One of the objects of my invention is to provide an improved sound reflector in a device of the character indicated.

Another object is to provide an improved form of sound conveyor in combination with a reflector of the aperiodic type.

The particular feature of the sound conveying device is the fact that it is composed of two frusto-conical members disposed one within the other on the same axis, with perforations provided in the inner member which allow the sound waves of the inner member to pass into the outer member, the sound waves arriving at the inner member.

This disposition allows me to discriminate the waves in two sound bodies whose constants agree with high and low sounds.

The particular feature of the reflector is the fact that it is constituted by a polished glass surface preferably cut out from a sphere, but which may be a plane surface if desired. With this device I am able to produce total reflection effects which assure a large output and the inertia due to the glass surface assures purity in the sound reflected. When the spherical reflector is used, either the convex or concave side may be utilized according to the particular effects desired.

In the following description I shall not allude to the particular device for producing the sound as the same has no particular bearing on my invention. My device is in the form of a unit which is readily adapted to any of the well-known acoustic devices such as the tone arm extending from the sound box in a phonograph, for example.

My invention will be more readily understood by those skilled in the art in the following detailed description when taken in connection with the accompanying drawings forming part of this specification, and in which 5 f j Fig. 1 is a vertical section taken along the line 11 of Fig. 2; and

Fig. 2 is a horizontal section taken along the line 2-2 of Fig.1.

Referring to the drawings more in detail, I have shown at 1 a flanged tube leading to the sound producing diaphragm which has not been illustrated since it forms no particular part of my invention.

A flanged elbow 2 forms an extension of a frusto conical member 3. The tube 1 carries a sleeve 1 mounted on balls 1'. The sleeve l carries a coupling sleeve 1 extending through a bracket 2 over which fits a flange 2 of elbow 2. The flange bracket and sleeves are clamped together by means of a screw 2 and nut 2. Bracket 2 is secured to the housing of the device by means of two screws 2 Fitted into the interior of member 3, is a frusto conical member 4. Adjacent the smaller end of member 4 is an an nular indentation 5 through which and adjacent to and extending through the member 4 are perforations 5'. The purpose of the indentation 5 is to provide a larger space between members 3 and 1 adjacent the holes 5. An open housing 7 receives the ends of members 3 and e and directly in front of said members is disposed a glass sound reflector 6. A space 8 is provided between the member 3 and housing 7 by means of spacing pins 8. Additional spacing pins 8 are provided between members 3 and 4C. These spacing pins, in addition to supporting memhere 3 and 4, prevent parasitic vibrations.

The glass reflector 6 is fitted into the end wall 10 of the housing 7 and extending therethrough'is a pin 9 having a conical head 11, preferably. The said pin 9 also extends through the wall 10 and through the wall of the instrument in which my device is used, a part of which is shown at 10. The whole is clamped together by means of a screw 12, screwed into pin 9 and beneath the head of which is inserted a washer 13.

The operation of my device is as follows: The sound waves arrive from the sound producing device through the tube 1 and member 2 and set the sound transmitting medium consisting of the columns of air contained in members 3 and 4 into motion. 'Due to the diflerent size and shape of the air columns a discrimination is produced in the larly for speech and music.

It is to be understood that while I have d escribed my reflector in connection with a double frusto-coni'cal sound conveying tube,

I may nevertheless employ the same witha 7 single tube.

If it is desired to obtain a very voluminous reproduction, I may reverse the position of the concavo-convex reflector so that it becomes a convex-concave reflector in order to reflect all the sound waves to the exterior. In this case when the sound Waves strike the the small end of said first tube, and also having a series of perforations adjacent the small end thereof, a plurality of spacing pins 7 for securing the large end of said second tube within the large end of said first tube in spaced relation thereto, and a concavo convex sound reflector of polished glass disposed in said housing directly in front of said tubes.

In testimony whereof I hereunto aflix my signature;

RENE DENOUX.

reflector coming through one or both tubular members as above described, they strike against a convex surface and are reflected into the housing in fan shape. It is to be understood that I may change the radius of curvature to produce the result desired and even increase the same substantially to infinity so that a plane surface isproduced. Inthis case underconsideration the sound may be less pure but it is more voluminous. I

My improved sound reflector 6 is constructed of polishedglass and either a'plane sur face or a spherical concavo-convex surface cut from a sphere or vice versa,,and consti- H tutes a new industrial product.

Having thus described my invent on what I I claim as new anddesire to secure by Letters Patent is:

1. An acoustic device of the type described comprising an open housing, a tapered tube having its large end opening'into said housing, means at the small end of said tube for connecting a sound producing device thereto,

spacing pins for securing the large end ofsaid tube within said housing,a; second ta 7 pered tube having its small end fitted within the small end of'said ofirst'tuberand also having a series of perforations adjacent the small end thereof, a plurality of spacing pins for securing the large end of. said second tube within the large end of said first tube in spaced relation thereto, and a sound reflector of polished glass disposed in said housing directly in front of said tubes.

2. An acoustic device of the type described comprising anopen housing, a tapered tube having its large end opening into said housmg, means at the small end ofsaid tube for connecting a sound producing device thereto,

spacing pins for securing the large end of said tube within said housing, a second taperedtubehaving its small end fitted within

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