JPH03165699A - Fiber reinforce dumper for speaker - Google Patents

Abstract

PURPOSE:To reduce anisotropy, to hardly generate lateral vibration in the state of hot press molding as a dumper by using a matrix material, to prevent rolling and to prevent an abnormal sound from being generated by the collision of a voice coil by composing cloth as a base material to be a triaxial weave crossed at a specified angle. CONSTITUTION:The triaxial woven cloth is composed of three weaving strings such as cotton, silk, nylon, carbon fiber and aramid fiber, etc., in which two longitudinal strings A crossed in the shape of X cross one lateral string B at 60 deg., and the matrix material such as butyl rubber, epoxy resin or phenol resin, etc., is used for this cloth and integrally coupled by the hot press molding. Thus, axially asymmetrix vibration is hardly generated and a rolling phenomenon caused by the lateral vibration is suppressed. Then, the generation of the abnormal sound caused by the contact of the voice coil to a top plate is eliminated. Further, since there is a lateral vibration suppressing operation, a bottom resonance frequency can be lowered and a band can be widened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in fiber reinforced dampers for speakers.

[Prior Art] Fig. 5 is a cross-sectional view of a conventional dome-shaped speaker. Voice coil bobbin, (4) is the voice coil wound around it, (5) is a magnet, (6) is a frame, (7) is a top plate, (8) is a pole piece, and (9) is a magnetic gap. .

Incidentally, in general, a damper only needs to contribute to stiffness, but in reality it has an area close to that of a diaphragm, and it greatly influences the characteristics of a speaker unit such as sound pressure, response, and sound quality.

From this perspective, the linearity of the diaphragm's amplitude and prevention of rolling (making it difficult to move against lateral vibration)
, and are required to have a moderate internal loss, and various materials are used. However, since these properties have contradictory elements, it is difficult to satisfy all of the above properties with a single material. (10) is used as a base material, and matrix material (11) is added to this.
By filling or coating with rubber, resin, etc., and integrally molding, linearity and internal loss are increased.

[Problem to be solved by the invention] However, in the conventional damper, as shown in FIG. It has anisotropy in the 45-degree direction and is easily deformed, and when the diaphragm vibrates, a non-axisymmetric vibration mode occurs in the damper, and with lateral vibration, the voice coil hits the top plate in the magnetic gap, causing abnormality. This was causing noise and deteriorating the characteristics of the speakers.

This invention has been made to solve the above problems, and provides a fiber reinforced damper that can prevent rolling by eliminating the anisotropy of the damper and preventing non-axisymmetric vibration modes that occur therein. With the goal.

[Means for Solving the Problems] In the damper of the present invention, two warp threads (A) and (B) combined in an X shape each have a diameter of 40
Rubber, epoxy resin, phenolic resin, etc. are added to the triaxial weave cloth, which is made up of three woven threads of cotton, silk, nylon, carbon fiber, aramid fiber, etc., intersecting at angles ranging from 80 degrees to 80 degrees. These are bonded together by hot press molding using matte wood.

[Function] Since the damper of this invention has a triaxial weave cloth in which the base material intersects at the above-mentioned specific angle, anisotropy is reduced and isotropy is achieved, so Young's modulus in all directions is reduced. are almost equal, and non-axisymmetric vibration is less likely to occur when the damper to which the matrix material is bonded vibrates, and rolling is prevented.

[Example] An example of the present invention will be described below. That is, (2) in FIG. 1 is a damper of the present invention which has a ring shape and is constructed using the triaxial woven cloth of the present invention shown in FIG. 2 as a base material. FIG. Specifically, as shown in FIG. 2, the base material of the damper of this invention has two warp threads (A) (
A) is a triaxial weave cloth composed of three woven threads of cotton, silk, nylon, carbon fiber, aramid fiber, etc., each intersecting one weft thread (b) at an angle of 60 degrees. In addition to this, butyl rubber, epoxy resin,
These are bonded together by hot press molding using a matrix material such as phenol resin.

As described above, the damper of this invention is based on a triaxially woven cloth with low anisotropy made of the above-mentioned fibers in which the warp and weft intersect at the above-mentioned specific angle, and this triaxially woven cloth is made of butyl rubber. , epoxy resin, and phenol resin are attached as matrix materials, and these are bonded together by hot press molding, so non-axisymmetric vibration is less likely to occur, and rolling phenomenon caused by lateral vibration is suppressed. This eliminates the generation of abnormal noise due to contact with the top plate, and also has a lateral vibration suppressing effect, so the lowest resonant frequency can be lowered and a wider band can be achieved.

In the above embodiment, the warp thread and the weft thread are each composed of one thread, but the same effect can be obtained even if each thread is composed of two or more threads as shown in Fig. 3 (A) and (B). can get. Further, although the warp and weft threads are woven to intersect at an angle of 60 degrees, the same effect as described above can be obtained even when the warp threads and weft threads are woven to intersect at an angle in the range of 40 degrees to 80 degrees.

[Effects of the Invention] As described above, in the fiber-reinforced damper of the present invention, the base cloth is formed into a triaxial weave that intersects at a specific angle, so that its anisotropy is reduced.

In addition, when the matrix material is hot press-formed as a damper, lateral vibrations are less likely to occur, and rolling can be prevented, making it easy to obtain a damper that does not generate abnormal noise due to voice coil collisions. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an embodiment of a fiber-reinforced damper for a speaker according to the present invention, and FIG. 2 is a partially enlarged plan view showing a triaxially woven cloth constituting the base material thereof. 3(A) and 3(B) are similar partially enlarged plan views showing other embodiments of FIG. 2, FIG. 4 is a plan view of a conventional damper, and FIG. 5 is a cross section of a conventional general dome-shaped speaker. 6A and 6B are partially enlarged sectional views of a conventional composite damper. In the figure, (a) is the warp thread, and (b) is the weft thread.

Claims (1)

[Claims] Three woven fabrics, such as cotton, silk, nylon, carbon fiber, aramid fiber, etc., in which two X-shaped warp threads intersect one weft thread at angles ranging from 40 degrees to 80 degrees. A fiber-reinforced damper for speakers characterized by using a matrix material such as rubber, epoxy resin, or phenol resin on a triaxially woven cloth made of thread, and bonding these together by hot press molding.