JPH0795879B2 - Speaker edge - Google Patents

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 cloth impregnated with a phenol 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 provide the speaker edge with rigidity for supporting the speaker diaphragm at the correct position. However, the rigidity of this shape-imparting material deteriorates 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 the weight are increased, and the quality of the shape-imparting material is unevenly impregnated, which may cause variations in quality. (2) Porosity or thickness is not sufficient, and the viscous resistance of air due to air passing through the holes is small, resulting in a large Q _{0 of} the speaker and a sharp peak at f ₀ on its 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]

[MEANS FOR SOLVING THE PROBLEMS] A speaker edge according to the present invention for achieving the above object is a speaker edge formed by heating and pressing a non-woven fabric using polyethylene terephthalate fiber. The non-woven fabric used is a non-woven fabric using a polyethylene terephthalate fiber bundle in which at least two or more polyethylene terephthalate yarns formed by laying together at least two or more polyethylene terephthalate single fibers are bundled and the outer periphery is covered with a urethane resin. And

[0008]

[Operation] And, in the speaker edge having such a configuration,
Since the polyethylene terephthalate is crystallized and the hardness is increased by heat-pressing, no shape-imparting material is required. This makes the speaker edge lighter,
Alternatively, if the weight is almost the same, the thickness can be easily increased.

Furthermore, the urethane resin greatly improves the internal loss, and in combination with the fact that the nonwoven fabric is used in the structure, the porosity is uniform and the viscous resistance of the air is large.

[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 the 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. Mold, accelerate crystallization, take out the molded product from the mold,
The speaker edge according to the present application is obtained by cutting into a predetermined shape.

Although the loudspeaker edge according to the present invention has been described above in detail with reference to the representative examples, the embodiment of the present invention is not limited to the above-mentioned examples, and the above-mentioned claims are not limited. 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. 2. For comparison, as a conventional example, an outer magnet type dome speaker was completed by using a speaker edge formed by coating an acrylic resin vibration absorbing material on PET woven cloth in the same manner as described above. The frequency-output sound pressure and admittance characteristics are shown in Fig. 2.

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 in the manufacturing stage, and the deterioration of the speaker edge due to the change with time 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. ⁶ Identification code Internal reference number FI technical display location B29L 31:38 (56) References Actual publication Sho 54-179739 (JP, U)

Claims (1)

[Claims] 1. A speaker edge formed by heat-pressurizing a non-woven fabric using polyethylene terephthalate fiber, wherein the non-woven fabric using polyethylene terephthalate fiber is formed by laying together at least two or more polyethylene terephthalate single fibers. A speaker edge, which is a non-woven fabric using a polyethylene terephthalate fiber bundle in which at least two polyethylene terephthalate yarns are bundled and the outer periphery is covered with urethane resin.