FR2781971A1 - Light emitting car loudspeaker technique having dual purpose sound/light transmitting slab with high refractive index and transparent side section illuminated and back surface light reflecting. - Google Patents

Abstract

the luminous loudspeaker uses a vibrating plate section (1) to which transducers are applied producing sound outputs. The plate section is in transparent plastic and has a fibre optic function with a refractive index above air. Light is fed in through the plate side (2) . The back plate (4) is a reflecting surface to reflect light through the front surface.

Description

OBJECT OF THE INVENTION The invention relates to a flat loudspeaker which,

  as such, is intended to emit sound, but with the parti-

  very special cularity which in turn is capable of pro-

  dim and diffuse light so that the resonance plate offers a completely simulated aesthetic appearance,

  making its occultation or its covering unnecessary and

  final, concealment and overlap of the speaker.

  The plan speaker finds an application for

  particular in the automotive industry, to be mounted on roofs or other suitable places inside the vehicle interior, so that this speaker emitting light, and sound , allows to include these two functions in the same physical space and thus solving the

  problem with the aesthetics of the planned flat speakers

  only to emit sound, while saving more than

  space, since it includes two functions in one.

Prior art

  Flat speakers are well known: their application

  cation is provided in motor vehicles, these built-in

  speakers are provided to emit sound, by transmission of

  vibrations to a resonance plate, by means of a transducer

  electrodynamic sensor vibrating the plate by emitting the

  sound evenly over its entire surface, with effective

high city.

  Not only the structure and the physical principle

  that flat speakers are known, but some

  my geometries of these loudspeakers are also, as well as forms aiming to position the transducers as it should be in order to obtain an excitation of the greatest possible number of natural frequencies of vibration, so as to cover the frequency band wide possible at

inside the audible spectrum.

  We also use different types of material.

  for the vibrating resonance plate. We can cite as being optimal the plates formed by a sandwich

  allowing high flexural stiffnesses.

  One of the possible disadvantages of this type of

  speakers, applied to vehicles, lies in the be-

  take care to use a resonance plate of dimensions

  maple trees; the plate must then be concealed and covered by a type of grid or protection so as not to be visible.

Description of the invention

  The loudspeaker according to the invention has been designed to solve this problem satisfactorily, because its resonance plate is made of a material capable of producing and diffusing light and sound, which

  allows you to integrate the two functions in the same physical space

  and therefore to solve the aesthetic problem

  a speaker that produces only sound.

  More specifically, in a preferred embodiment, the resonance plate is made of fibers

  plastic optics such as polycar-

  transparent bonate or methacrylate, for not only vi-

  burn and emit sounds, but also diffuse light, producing an aesthetic effect making occultation unnecessary

or the speaker cover.

  The refractive index of the actual resonance plate, should be the adequate index with respect to air to allow an efficient diffusion of the light which

  is projected or issued by one or more sources of

  mother. This may be the case for a LED diode, which may or may not be integrated into the plate itself, the light source being arranged on a part of the lateral surface of said plate. The face opposite to this light source and the face of the resonance plate opposite to the emission of light being covered with a reflecting and rough or reflecting surface, so that the light emitted by

  the light source is diffused by the plate by reflecting

  on the surface mentioned above and projects to

  the outside of the plate by the face opposite to the surface

flective or rough.

  The speaker thus formed is concealed by-

  in the roof of the vehicle, since on the one hand it is transparent and on the other hand, the light emitted by the source

  of light is projected towards the face opposite to the ex-

  dull speaker, that is, the face visible to

  the interior of the vehicle interior.

  It is obvious that the loudspeaker includes electrodynamic transducers to induce the vibrations corresponding to the plate and makes it possible to emit sound. These

  transducers are attached to the plate on the reflected surface

  rough and rough, on the side opposite that of the emiss

  light. Thus the transducers are not visible. The loudspeaker plate is fixed to a support allowing mounting on the roof of the vehicle; this

  medium is generally constituted by a non-ri- suspension

  guide allowing the vibration of the plate, with the possibility of using the connections of the light source as suspension means, using a semi-rigid suspension capable of supporting the weight of the loudspeaker, as well as a

  high number of flexions without suffering any damage.

  The light source is connected in parallel to the wiring for the audio signal, so that this source of

  light flashes at the frequency of the audio signal, which

  drags, on the loudspeaker, a blinking of light emitted with the same frequency as that of sound, that is to say a synchronization between the frequency of light emitted and the sound

  produced and ultimately a curious effect that can be

  required in certain applications.

  Drawings The present invention will be described below in

  using an exemplary embodiment shown in the

  attached sins in which: - Figure 1 shows a schematic view of a side section of a light plane loudspeaker according to the invention, - Figure 2 shows the loudspeaker according to Figure 1, with the corresponding electrodynamic transducers and semi-rigid supports formed by the fixings of the sources

speaker light.

  Preferential embodiment of the invention According to the figures, the loudspeaker of the invention consists of a resonance plate 1, which receives lateral light from one or more light sources 2, such as a LED diode which may or may not be included in the

  plate 1. Plate 1 has two surfaces 3 and 4. The over-

  side 4 is the rear surface, inside the housing of

  the plate 1 constituting the loudspeaker on the roof of a vehicle

  hicule, for example; surface 3 is the one that remains at

outside or is visible.

  The light emitted from source 2 must be projected

  ted by plate 5. For this on the opposite surface 4 we

  applies a rough or reflective surface

  health, having a high tensile strength, so as to increase the flexural rigidity of the plate 1, favoring

its acoustic properties.

  The same reflective surface is also applied

  healthier or rougher than that provided on the surface

  chée 4, at the end 5 opposite to that of the source of

  light 2, in order to avoid light output.

  The plate 1 preferably consists of a

  suitable material with acoustic and luminous properties

  its complementary; methacrylate or polycarbonate trans-

  parent present an optimal efficiency, by their refractive index compared to air, adapted to the diffusion of

  light and by the induction of a vibration, consistent-

  lie to the theory of the vibration of a flat plate.

  As can be seen in Figure 1, the

  light emitted by the light source 2 affects the reflective surface 4 and is projected, in the direction of the arrows 6, towards the visible face 3 or light emission

proper.

  The speaker as a whole must have

  electrodynamic transducers 7 for inducing vibra-

  tions to plate 1; these transducers 7 adhere to the face corresponding to the reflective and rough surface

  4, that is to say on the face opposite to that of emission of

  3 and they are thus invisible.

  The mounting of the plate 1 is done on a support

  suitable for attachment to the vehicle roof. The fixing

  tion can be done on a non-rigid suspension allowing the plate to vibrate. It is also possible to use the light source 2 connections or a semi-connection

  rigid capable of supporting the weight of the plate or top

  speaker 1 as well as a high number of flexions without undergoing

  no damage. These connections are mounted on the cor-

fixing agent 8.

  The semi-rigid connections can be of the type of conventional loudspeakers for connecting the cable carrying the acoustic signal to the inducing coil of the magnetic field, which conditions the position of the light source 2 at the places where the vibration of the plate l 'will interrupt as little as possible. This is without prejudice to a correct distribution of the light, since it is distributed uniformly over the entire plate before being

issued outside.

  Finally, it should be emphasized that it is possible to

  connect the light source (s) 2 to the wiring by the-

  what audio signal is emitted, so that the speaker, while vibrating and producing sound, produces light in a synchronized manner and with the same frequency, which makes it possible to obtain a curious optical and acoustic effect presenting

  great interest in certain applications.

Claims (4)

R E V E N D I C A T 1 0 N S   ) Bright plane loudspeaker for motor vehicles comprising a resonance plate (1), the vibrations of which produce sound, by electrodynamic transducers (7),   characterized in that the plate (1) is made of a transparent material, made of plastic, acting as an optical fiber, with a refractive index with respect to air to allow the diffusion of light emitted in the plate by a source of light (2)   provided on the sides of the plate.   2) Luminous flat loudspeaker for vehicles, as per   vendications 1, characterized in that a reflective and rough surface which not only has a high rigidity in bending of the plate, but promotes its acoustic properties and reflects the light emitted by the light source (2) for its projection and its exit through the visible face (3) of the plate (1) is applied   on the non-visible face (4) of the plate (1).   3) Luminous flat loudspeaker for vehicles, according to the re-   vendication 1, characterized in that the end (5) opposite the light source (2) has another reflective and rough surface to prevent   light does not escape through this end (5).   4) Luminous flat loudspeaker for vehicles, as per   previous vendications, characterized in that the non-visible face (4) on which the reflecting surface is applied is constituted by the means for fixing the electrodynamic transducers (7), themselves hidden like the non-visible face (4) by the diffusion of light emitted by the light source (2).    ) Illuminated loudspeaker for vehicles, according to the preceding claims, characterized in that   the plate (1) is mounted on a non-rigid suspension per-   putting the vibration of it, this suspension being reac   connected by the semi-rigid connections for the supply of the light source (s) (2) and fixed to the supports corresponding fixing (8).