Acoustics – Diaphragm – Particular shape
Patent
1997-11-21
1999-05-25
Dang, Khanh
Acoustics
Diaphragm
Particular shape
181167, 181152, G10K 1100
Patent
active
059071338
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention concerns a device for electroacoustic diffusion comprising diaphragms, balances, and trumpets, made out of balsa wood or mixtures including balsa wood.
It is well known that electroacoustic diffusers, also called loudspeakers, transform electric signals into acoustic energy by means of the vibration of a diaphragm, which usually has a conic shape, a dome-shape, or a planar shape.
The material used for constructing the membrane is fundamental for obtaining the desired electroacoustic features. Research for obtaining the best response from the point of view of the electroacoustic effects, the psychoacoustic effects, and the tone-color of the sound, has led to the use of materials that have various determined features like lightness and non-deformability.
The lightness property allows one to obtain correct reproduction of the high frequencies, while the non-deformability property determines the ability of the material to be exposed to considerable acoustic pressures without distortions due to deformations of the material.
It is easy enough to find materials with the above mentioned features; the use of materials derived from aerospace technologies has allowed one to obtain optimal electroacoustic features, but these materials confer a particular tone-color which often makes the sounds sound reproduced and far removed from a natural tone-color.
One of the reasons that has led to the use of cellulose--which is at present the most widely used material--is that its tone-color is the most natural if compared with other materials that are more rigid and heavy.
Also mixtures of metal and synthetic materials have been used, and this was always with the purpose of obtaining lightness, non-deformability, and correct tone-color.
The main problem remains one of obtaining a non "colored" sound, i.e., the most natural possible sound and, where it may be accepted, a pleasant coloring.
For getting as near as possible to a natural reproduction of the sound, membranes have been developed out of fir-wood, which, even if they are very rigid, have a correct tone-color. These membranes, however, have the problem of being heavy, which prevents one from obtaining acceptable speeds at those frequencies that are not low.
Diffusers have been produced with vibrating wood stripes of different lengths, so as to have different masses according to the frequency to be reproduced, but the dynamic, i.e., the capacity of obtaining quick variations of acoustic pressure, is rather reduced due to the physical structure of the diffuser, because the stripes always have considerable inertia due to their total weight.
SUMMARY OF THE INVENTION
It is the aim of the present invention to provide, in addition to balances and trumpets, a membrane that may supply good electroacoustic response with minimal coloring and pleasant listening, without any trace of the artfulness that characterizes diffusers that make use of the materials known in the art.
The aim set forth is reached by means of the device according to the present invention, a device for electroacoustic diffusion, which mainly comprises: to 5 mm, cut in such a way that the structure of the fibers prevents deformation, and therefore, in the case of a truncated-cone shape, which is typical for a loudspeaker, includes radial fibers, with triangular pieces folded with steam and glued; out of balsa wood with thicknesses that vary according to the frequency; magnet and thus prevents the coil from touching the fixed part of the magnetic circuit, wherein the balance is put into vibration together with the membrane, so as to act with the vibration of the membrane that is mechanically coupled to the same due to its elasticity and itself working as a sound source, even if at a lower rate, so as to interfere with the emission of the membrane with products of intermodulation, wherein the balance is produced out of balsa wood or consists of a stripe of balsa wood fixed at the ends with the coil and glued at the middle, wherein the elasticity of the wood stri
REFERENCES:
patent: 2615995 (1952-10-01), Voigt
patent: 2638510 (1953-05-01), Brami
patent: 2852089 (1958-09-01), Cohen et al.
patent: 5668886 (1997-09-01), Sakamoto et al.
LandOfFree
Device for electroacoostic diffusion, with diaphragms, spiders a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for electroacoostic diffusion, with diaphragms, spiders a, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for electroacoostic diffusion, with diaphragms, spiders a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-402347