JPH0576096A - Speaker edge - Google Patents

Abstract

PURPOSE:To provide the speaker edge not requiring a forming member, small in change with lapse of time, large in air viscous resistance, and capable of reducing the Q0 of the speaker. CONSTITUTION:Seven or eight PET threads 2 made of a PET single fiber 1 are bound. This external periphery is coated by urethane resin 3a, producing a PET fabric flux 3. The fabric of 0.5mm in width that permits cloth to breath made of this PET fiber flux 3 is heated for twelve seconds in a mold whose space of the upper and lower molds is 0.45mm with the roll edge shape heated up to 180 deg.C, promoting the crystallization. The molded object is taken out from the mold, cut into the prescribed shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker edge in an electroacoustic transducer.

[0002]

2. Description of the Related Art As is well known, a speaker edge is provided between an outer peripheral edge of a speaker diaphragm and a speaker frame and has a function of supporting a voice coil and a speaker diaphragm in a correct position together with a damper. ..

The performance required for the speaker edge is as follows: (1) It has a sufficiently high compliance in the vibration direction of the speaker diaphragm so as not to disturb the vibration of the speaker diaphragm. (2) In order to support the speaker diaphragm in the correct position, it must have sufficient rigidity for lateral movement of the speaker diaphragm. (3) The linearity of the driving force-displacement characteristic is good even in a large amplitude region in order to suppress the occurrence of harmonic distortion particularly in the low range. (4) Do not cause edge resonance or inversion vibration that causes abnormal radiation. (5) Lightweight as a vibration system component. Etc.

In order to satisfy these conditions, conventionally, a woven fabric impregnated with a phenolic resin as a shape-imparting material is coated with an acrylic resin or the like as a vibration-absorbing material, or a non-woven fabric is made of a thermosetting resin and a shape-imparting material and a vibration-absorbing material. A molded product obtained by applying or impregnating and is used.

[0005]

The conventional speaker edge having such a structure uses (1) a shape-imparting material in order to give the speaker edge rigidity to support the speaker diaphragm at the correct position. However, this shape-imparting material deteriorates in rigidity as the speaker is used, and the f _{0 of} the speaker decreases, so that the initial performance cannot be maintained for a long period of time. In addition, the cost and weight increase, and the quality of the shape-imparting material is likely to be unevenly impregnated. (2) Porosity or thickness is not sufficient, and the viscous resistance of air due to air passing through the holes is small, so Q _{0 of} the speaker becomes large and a sharp peak appears at f ₀ on the frequency characteristic. .. There was a problem to be solved.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, provides a speaker edge that does not require a shape-imparting material, has little change over time, and has a sufficiently large viscous resistance of air and a small Q ₀ of the speaker. The purpose is to do.

[0007]

A speaker edge according to the present invention for achieving the above object is characterized in that a nonwoven fabric using polyethylene terephthalate fiber is formed by heating and pressing, and the polyethylene terephthalate fiber is used. The non-woven fabric used may be a non-woven fabric using a polyethylene terephthalate fiber bundle in which at least two or more polyethylene terephthalate yarns formed by tying at least two or more polyethylene terephthalate single fibers are bundled and the outer periphery is covered with a urethane resin. ..

[0008]

[Operation] And, in the speaker edge having such a configuration,
By heat-press molding, crystallization of polyethylene terephthalate proceeds and hardness increases, so that a shape-imparting material is not required. This reduces the weight of the speaker edge,
Alternatively, if the weight is almost the same, the thickness can be easily increased.

Further, in the case where the polyethylene terephthalate fiber bundle covered with urethane resin is used, the internal loss is greatly improved by the urethane resin, and the porosity is uniform in combination with the fact that it is a non-woven fabric. This greatly increases the viscous resistance of the air.

[0010]

Embodiment An embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a structural explanatory view of the embodiment. In FIG. 1, 1 is polyethylene terephthalate (PET) single fiber, 2 is P
ET yarn, 3 is a PET fiber bundle, and 3a is a urethane resin.

PET yarn 2 in which PET monofilaments 1 are twisted together
7 to 8 are bundled and the outer periphery thereof is coated with urethane resin 3a to prepare a PET fiber bundle 3. This non-woven fabric with a thickness of 0.5 mm in which PET fiber bundles 3 are entangled with each other is heated and pressed for 12 seconds by a mold heated to 180 ° C. in a roll edge shape with a gap of 0.45 mm between the upper and lower molds. Perform molding, promote crystallization, take out the molded product from the mold,
The speaker edge according to the present application can be obtained by cutting into a predetermined shape.

Although the speaker edge according to the present invention has been described above in detail based on the representative examples, the embodiment of the present invention is not limited to the above-mentioned examples, and the above-mentioned claims The present invention can be appropriately modified and carried out as long as it has the constituent requirements described in the range, exhibits the action of the present invention, and has the effects described below.

[0013]

[Effect] An outer magnet type dome speaker was completed by using the speaker edge having an inner diameter of 40 mm, an outer diameter of 68 mm, and a roll height of 3.3 mm obtained in the example. The frequency-output sound pressure and admittance characteristics are shown in FIG. As a conventional example for comparison, an outer magnet type dome speaker was completed by using a PET woven cloth coated with an acrylic resin vibration-absorbing material and molding the speaker edge in the same manner as described above. The frequency-output sound pressure and admittance characteristics are shown in FIG.

As is clear from FIG. 2, the speaker edge according to the present invention has a large viscous resistance of air,
Since Q _{0 of the} speaker is reduced, the peak at f ₀ is suppressed, and the frequency characteristic is flattened, a speaker having excellent acoustic characteristics can be obtained. Further, since it is not necessary to use the shape-imparting material, it is easy to obtain uniform quality at the manufacturing stage, and the deterioration of the speaker edge due to the aging of the shape-imparting material does not occur.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of an embodiment.

FIG. 2 is a frequency-output sound pressure and admittance characteristic diagram of an example and a conventional example.

[Explanation of symbols]

 1 PET monofilament 2 PET yarn 3 PET fiber bundle 3a Urethane resin

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location B29L 31:38 4F (72) Inventor Masami Furubayashi 2-1, Nisshin-cho, Neyagawa-shi, Osaka Onkyo stock In the company

Claims (2)

[Claims] 1. A speaker edge comprising a non-woven fabric made of polyethylene terephthalate fiber, which is formed by heating and pressing. 2. A polyethylene terephthalate fiber in which the non-woven fabric using the polyethylene terephthalate fiber has at least two polyethylene terephthalate yarns formed by laying together at least two or more polyethylene terephthalate single fibers and bundling at least two of them and covering the outer periphery with a urethane resin. The speaker edge according to claim 1, wherein the speaker edge is a non-woven fabric using a bundle.