FR2720215A1 - Sandwich structure for sound amplifier - Google Patents

Abstract

A sound amplifier includes a radiator which constitutes the casing of the amplifier itself. The radiator has a sandwich structure (1) made up of a number of metal plates (1.1) stacked and attached to each other. The structure has a semicircular shape which surrounds the amplifier transformer (2). Each plate presents a number of recesses (1.4) which can have different shapes, e.g. honeycomb shapes. Electronic components of the amplifier are positioned on the exterior vertical surface of the structure.

Description

SANDWICH STRUCTURE FOR SOUND ENHANCING APPARATUS
The invention relates to the technical sector of sound amplifier devices and the like.

Sound amplifiers generally include a radiator (R) to which electronic components (C) are attached, these radiators being provided with a plurality of fins (R1) in a comb configuration to ensure an expansion of the inherent thermal heat to said components.

FIG. 1 is a diagrammatic perspective and perspective view of a sound amplifier with radiator of the aforementioned type according to the prior art.

In this embodiment, reference has been made by (T) the transformer, and by (C) the electronic signal processing card.

These radiators are currently designed as a single piece and are made of aluminum material, extruded by die, comprising a number of suitable fins; these fins are parallel to each other and arranged over the entire length of the radiator.

In practice, this type of radiator which is commonly used, has drawbacks by the fact that the fins are exited by sources of acoustic vibrations generated by the HIFI system. These vibrations disturb the radiator, which in turn vibrates, and vibrates the signal processing electronics.

In an attempt to remedy this drawback, it has been proposed to add and fix over the length of the radiator and part of its width, against the fins, a strip of damping material.

However, this modification is not sufficient to cancel these observed vibrational phenomena.

As part of its research, the Applicant has imagined and designed a new type of radiator for sound amplifiers, solving the problem posed, and bringing in an entirely unexpected manner, new results and a quality of sounds never obtained in his knowledge.

According to a first characteristic of the invention, the sound amplifier device is remarkable in that the radiator or radiators are produced in the form of a sandwich structure comprising a multitude of metal plates stacked one on the other and linked together by connecting means, said plates being of variable external shape and internally defining after stacking a shape surrounding the amplifier transformer, said plates being arranged with a plurality of profiled cells established after stacking over all or part of the height of the sandwich structure by allowing thermal expansion.

According to another characteristic, the sandwich structure forming the radiator constitutes the casing or housing of the amplifier, and in that the structure comprises a stack of metal plates of shape corresponding to the external shapes of an amplifier, the said structure comprising a first zone. hollow allowing the insertion of a transformer and one or more hollow zones allowing the positioning of electronic cards and electronic components, and in that in the rest of its thickness the sandwich structure is arranged with a plurality of cells established in nest bee or other form.

These characteristics and others will become apparent from the following description.

To fix the subject of the invention illustrated in a nonlimiting manner in the figures of the drawings where:
Figure 1 is a schematic view illustrating a sound amplifier apparatus according to the prior art.

FIG. 2 is a perspective view of a sandwich structure according to the invention which can be integrated into the sound amplifier apparatus.

Figure 3 is a plan view according to Figure 2 of the sandwich structure.

FIG. 4 is a side view according to FIG. 2.

Figure 5 is a plan view of an alternative embodiment of the sandwich structure.

Figure 6 is an alternative view of a sound amplifier apparatus according to the invention.

In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.

With reference to FIGS. 2 to 5, the sound amplifier apparatus according to the invention comprises a radiator which constitutes one of the components of the amplifier.

In the variant of FIG. 6, this radiator in its new design constitutes the housing or even casing of the amplifier.

The originality consists in making it in the form of a sandwich structure (1) comprising a multitude of metal plates (1.1), stacked on one another, and linked together by known connecting means (1.2).

These plates have a variable external shape as required and advantageously have, after stacking, a semi-circular shape (1.3) to come concentrically surround the transformer (2) of the amplifier.

There is shown in the drawings of Figures 2 to 5 in a nonlimiting manner such a shape.

The various plates are also themselves arranged with a plurality of cells (1.4) profiled with variable shapes established after stacking over all or part of the height of the structure thus produced, and allowing thermal expansion.

In a very particular implementation, these cells have a honeycomb configuration (1.5) as shown in Figure 5 of the drawings.

Unexpectedly, this particular configuration provides a complementary anti-vibration function. The arrangement of these different honeycomb profiles is carried out over all or part of the surface of each of the metal plates, outside the fixing zone.

The electronic components (3) remain fixed on the opposite external face (1.6), vertical, arranged facing the position zone of the electronic components and of the cards (4) in general.

The diameter of the hollow shape of the sandwich structure is such that it can adapt to different transformer sections, without there being an obligation to adapt a structure by transformer.

It has also been found, unexpectedly, that the arrangement of one or two sandwich structures around a transformer creates a complementary effect of electromagnetic shielding, which contributes to improving the quality of the electronic amplifier.

As part of an application extension, the sandwich structure forming the radiator itself constitutes, as illustrated in FIG. 6, the casing (5) or box of the amplifier. In this very particular implementation, the structure comprises as before a stack of metal plates (5.1) having a rectangular shape for example to correspond to the usual external shapes of an amplifier or any other shape.

This structure then comprises a first hollowed-out zone (5.2) authorizing the insertion of a transformer (6), and one or more other hollowed-out zones (5.3) of any profile, independent of the previous one (5.2), and allowing the positioning of the electronic cards (7) and electronic components.

Outside these two large recess areas, and in the rest of its thickness, the sandwich structure is arranged with a plurality of cells (5.4) established in honeycomb or any other form.

The results obtained in this particular configuration are quite astonishing and the elimination of the vibratory effects encountered previously is total.

The simplicity of manufacturing of the stacked plates leaves free to all arrangements of shapes not only of the cells, but of zones allowing the positioning of the transformer and electronic cards as well as the thickness.

In general, the sandwich structure described according to the invention forming a radiator or amplifier casing, adapts to any variation in power of the transformer according to ranges of amplifiers.

The invention is easy to carry out and its advantages inherent in its manufacture and the improved acoustic quality are essential.

Claims (6)

1 - Sound amplifier device of the type comprising, in a protective casing or case, one or more radiators, one or more electronic components, and a transformer, characterized in that the radiator or radiators are produced in the form of a sandwich structure ( 1) comprising a multitude of metal plates (1,1) stacked on each other and linked together by connecting means (1.2), said plates being of variable external shape and defining internally after stacking a shape surrounding the transformer (2) of the amplifier, said plates being arranged with a plurality of profiled cells (1.4) established after stacking over all or part of the height of the sandwich structure while allowing thermal expansion. 2 - Apparatus according to claim 1. characterized in that the cells have a honeycomb structure (1.5), providing a complementary anti-vibration function. 3 - Apparatus according to any one of claims 1 and 2 characterized in that the electronic components (6) are fixed on the opposite outer face (1.6) vertical disposed opposite the position area of the electronic components and cards (4 ) in general. 4 - Apparatus according to any one of claims 1 to 3 characterized in that the diameter of the internal hollow shape of the sandwich structure is such that it can adapt to different transformer sections. 5 - Apparatus according to any one of claims 1 to 4 characterized in that the arrangement of 2 sandwich structures around a transformer provides a complementary function of electromagnetic shielding improving the quality of the electronic amplifier. 6 - Apparatus according to any one of claims 1 to 5 characterized in that the sandwich structure forming the radiator constitutes the casing (5) or housing of the amplifier, and in that the structure comprises a stack of metal plates (5.1 ) of shape corresponding to the external shapes of an amplifier, the said structure comprising a first hollowed-out area (5.2) allowing the insertion of a transformer (6) and one or more hollowed-out areas (5.3) allowing the positioning of the electronic cards ( 7) and electronic components, and in that in the rest of its thickness the sandwich structure is arranged with a plurality of cells established in honeycomb or other form.