JP2001268691A - Damper for speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper for a speaker which does not require a process of impregnating phenol resin, etc., and then prevents adverse influence on the human body and environmental contamination when manufactured, and is easily manufactured and suitably made thin. SOLUTION: Filaments 1 in core sheath structure formed of polyethylene terephthalate as a core material 1a and polypropylene as a sheath material 1b and a couple of conductive yarns 2 formed by winding a conductor 2b around a yarn material 2a are woven in a net shape to form fabric, which is hot-cold processed to bind intersections of filaments 1 by the thermal fusion of the sheath material 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker damper for supporting a speaker diaphragm so as to vibrate.

[0002]

2. Description of the Related Art Conventionally, speaker dampers are generally manufactured by impregnating a woven or non-woven fabric made of various fiber materials with a phenol resin, a melamine resin, or the like, followed by heat molding.

Further, the damper supports a voice coil of a speaker so as to vibrate, and a lead wire of the voice coil is connected to an input terminal provided on a frame which is a speaker constituting member via a tinsel wire.

Since the tinsel wire is usually arranged in the space between the diaphragm and the damper, there is a problem in that it vibrates during operation and hits the diaphragm or the damper to generate an abnormal sound. This tendency has become more remarkable as the thickness has been reduced.

[0005] In order to solve this problem, there has recently been provided a damper in which a tinsel wire is attached to a damper by means such as bonding or sewing.

For example, Japanese Patent Laid-Open Publication No.
No. 34100 exists. This speaker damper is
The conductive member corresponding to the tinsel wire is sewn to a damper material.

[0007]

In a method of manufacturing a damper by impregnating a woven or non-woven fabric with a phenol resin or the like, since the phenol resin contains formaldehyde, some people may experience dizziness, nausea, and asthma. However, there is a problem that it has an adverse effect on the human body and also causes environmental pollution.

In Japanese Patent Application Laid-Open No. 2-134100, which discloses a technique for integrating a conductive member with a damper, a conductive member is formed from an inner peripheral portion to an outer peripheral portion by using a sewing machine and a thread according to the shape of corrugation. Since sewing is performed, there is a problem that work is complicated, productivity is poor, and followability during operation is poor.

The present invention has been proposed in view of the above. An object of the present invention is to eliminate the need for a step of impregnating a phenolic resin or the like in the production of a damper, and thus to reduce adverse effects on the human body and environmental pollution. Prevention and easy to manufacture,
Another object of the present invention is to provide a speaker damper suitable for thinning.

[0010]

According to the present invention, there is provided a filament 1 having a core-sheath structure comprising polyethylene terephthalate as a core material 1a and polypropylene as a sheath material 1b;
A pair of conductive yarns 2 formed by winding a conductor 2b around the outer periphery of a is knitted in a net shape to form a woven fabric, and the woven fabric is subjected to hot-cold molding so that the intersection of the filaments 1 is sheathed. The above object is achieved by adopting a configuration in which the material 1b is bonded by heat fusion.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The damper of the present invention is made of a woven fabric of fibers having a core-sheath structure made of two resin materials having different melting points, and a pair of conductive yarns serving as a tinsel wire is inserted into the fibers. Weave in.

[0012]

FIG. 1 is a schematic perspective view of a damper according to an embodiment of the present invention. The damper A is thin and has a ring shape, a circular space a is formed in the center, a voice coil (not shown) is provided in this part as is well known, and the outer periphery b is Coupled to a frame (also not shown). The damper A is made of a woven fabric composed of a plurality of filaments 1 having a core-sheath structure, and a pair of conductive yarns 2 extending from the inner peripheral portion a 'to the outer peripheral portion b' are woven into the woven fabric. And a corrugation is formed. Concentric circles in the figure indicate corrugations.

FIG. 2 is an enlarged view of a portion B in FIG. The damper A is formed by knitting the filaments 1 alternately vertically and horizontally in a net shape. This filament 1 is described in detail in FIG.
As shown in (a), a core-sheath structure is used, and polyethylene terephthalate (PE) having a melting point of 260 ° C. is used as the core material 1a.
T), and the outer sheath 1b is made of polypropylene (PP) having a melting point of 140 ° C., which is lower in melting point than polyester.

When forming a woven fabric by knitting in a net shape, as shown in FIGS. 1 and 2, a pair of conductive yarns 2 in which a part of the yarns are made conductive in advance are arranged in a horizontal or vertical direction. It is woven in parallel in the direction with an interval. As shown in detail in FIG. 3B, the conductive yarn 2 is formed by winding a conductor 2b such as a flat electric wire around a yarn material 2a such as a brocade. Consisting of a structure,
A plurality of the conductive yarns 2 are bundled in order to have strength. Since the conductive yarn is not subjected to conductive metal plating on the outer periphery of the yarn 2, plating equipment, a plating step, and the like are not required, and the manufacture is easy. In addition, there is no need for a step of impregnating or coating with a phenol resin or other thermosetting resin, which has advantages such as excellent environmental resistance and easy production.

[0015] Such a filament 1, a conductive yarn 2
Is formed into a net shape by hot-cold molding using an air-cooled molding machine, whereby a damper A having a desired shape can be obtained.

As a basic molding step (about 4 minutes per cycle) of the hot-cold molding, a heater (not shown) is applied to a mold and the temperature is raised to a predetermined temperature (145 ° C.).
As a result, the intersections of the filaments are bonded by thermal fusion of the sheath 1b.

Next, when the temperature of the mold reaches a predetermined temperature, the heater is retracted, and a net-shaped woven fabric made of filaments having a core-sheath structure is inserted into the mold, and pressed (press pressure: 3 kg).
/ Cm ² ). The pressing time is about 30 seconds for a thin material, but the temperature and time are adjusted according to the material thickness.

Thereafter, the die is cooled while being air-flowed to a predetermined temperature (approximately 75 ° C.) while being pressed.

Next, the damper A formed into a predetermined shape having corrugation may be taken out of the mold and used as a vibrating element material.

In the above-mentioned production, in the present invention, the sheath material 1b
Since the difference between the melting points of the core material 1a and the core material 1a is large, heat control during heat molding is easy, and the shape stability is further improved.

FIG. 4 shows an example of a speaker provided with the damper A. The inner peripheral portion of the damper A is bonded to a voice coil 4 connected to the neck of the diaphragm 3, and the outer peripheral portion is bonded to a predetermined position of a frame 5 preferably made of a resin such as ABS. Since it is preferable from an environmental point of view to use no adhesive, it is easy to use on the work surface without using an adhesive by using ultrasonic welding etc. in consideration of the lightweight resin frame as this bonding means. To be manufactured. In this case, it is needless to say that a conventional metal frame may be used.

Reference numeral 6 denotes a dust cap, 7 denotes an edge, 8 denotes a magnetic circuit including an inverted T-shaped yoke 9, a magnet 10, and a plate 11, and the voice coil 4 is arranged in the magnetic gap. This voice coil 4
Is the conductive yarn 2 woven into the damper A.
The outer end of the thread 2 is connected to an input terminal (not shown) provided on the frame 5 (see FIGS. 1, 2, and 3 (b)).

[0023]

As described above, according to the damper A of the present invention, the core 1a is made of polyethylene terephthalate, and the sheath 1b.
By hot-cold forming a woven fabric composed of filaments 1 having a core-sheath structure made of polypropylene,
The manufacture of the damper without the impregnation step can be easily achieved. Further, since the sheath material 1b is made of polypropylene having a low melting point, the mold temperature can be set to a low temperature of about 145 ° C., so that it is possible to easily obtain a damper with less shrinkage and deformation with a simple device, Since the conductive yarn 2 woven into the damper A is formed by winding a conductor 2b around the outer periphery of a yarn material 2a, the yarn can be made excellent in chemical resistance. It is easy to manufacture itself, and the conductive yarn 2 is woven together with the filament 1 and is integrated with the damper A. From this point, the manufacturing of the damper A is also easy, and a separate Since there is no tinsel wire, the speaker can be made thinner.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a damper body used in one embodiment of the present invention.

FIG. 2 is an explanatory partial plan view of a net-shaped damper.

3A is a cross-sectional view of a filament used in the present invention, and FIG. 3B is a cross-sectional view of a conductive yarn used in the present invention.

FIG. 4 is a cross-sectional view of an example of a speaker in which a damper according to an embodiment of the present invention is incorporated.

[Explanation of symbols]

 A Damper 1 Filament 1a Core 1b Sheath 2 Conductive thread 2a Thread 2b Conductor 3 Diaphragm 4 Voice coil 5 Frame 6 Cap 7 Edge 8 Magnetic circuit 9 Yoke 10 Magnet 11 Plate

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Claims (1)

[Claims] 1. A core material (1) comprising polyethylene terephthalate.
a) and a filament (1) having a core-sheath structure using polypropylene as a sheath material (1b), and a pair of conductive yarns (2) formed by winding a conductor (2b) around the outer periphery of a thread material (2a). )
Are knitted into a net to form a woven fabric, and the woven fabric is subjected to hot-cold molding to obtain a filament (1).
Characterized in that the intersections of the above are bonded by thermal fusion of the sheath material (1b).