JP3353491B2 - Speaker - 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 used for various kinds of audio equipment, and more particularly to a heat-resistant speaker which can be used even at a high temperature.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a speaker capable of sufficiently withstanding use under high temperatures in the field of emergency broadcasting such as a fire or muffler of an automobile muffler. However, a conventional speaker of this type will be described.

FIG. 2 is a sectional view showing the structure of the above-mentioned conventional speaker. In FIG. 2, reference numeral 16 denotes a center pole, 17 denotes a lower plate having the center pole 16, and 18 denotes an upper surface of the lower plate 17. And a ring-shaped magnet 19 magnetized in the thickness direction.
8 and the inner peripheral surface is the center pole 16
A ring-shaped upper plate formed to form a magnetic gap with the outer peripheral surface of the upper plate, 20 is a frame coupled to the upper surface of the upper plate 19, 21 is held in the magnetic gap, and is used for electric input. A voice coil bobbin which forms the voice coil 21 and transmits generated driving force to a vibration system;
23 is a damper whose inner and outer peripheral portions are respectively coupled to the middle part of the voice coil bobbin 22 and the middle part of the frame 20, hold the voice coil 21 in the magnetic gap without being eccentric, and provide a stiffness required for the speaker. Is a diaphragm connected to the upper part of the voice coil bobbin 22, and 25 is a diaphragm 2 whose inner and outer peripheral portions are respectively coupled to the outer peripheral portion of the diaphragm 24 and the peripheral edge of the frame 20.
4, an edge for allowing the vibration of 4 and blocking the radiation sound on the back of the diaphragm 24, a gasket 26 coupled to the outer peripheral upper surface of the edge 25, a cover 27 for the upper part of the voice coil bobbin 22, A dust cap coupled to the upper surface of the central portion; 28, a terminal plate coupled to the frame 20; 29, terminals coupled to the terminal plate 28;
0 has one end connected to the terminal 29 and the other end connected to the coil drawn out of the voice coil 21 and the diaphragm 2.
4, the voice coil 21 and the terminal 2
9 is a gold thread wire that is electrically conducted.

In the conventional loudspeaker constructed as described above, generally, the frame 20 is formed by galvanizing an iron plate processed into a desired shape, and the voice coil bobbin 22, the diaphragm 24, the dust cap 27, and the gasket 26 are made of kraft pulp. Formed of a laminate of paper, and
Is formed of a cotton cloth impregnated with a phenol resin, a melamine resin, or the like, the terminal plate 28 is formed of a phenol resin composite, and one end of the gold wire 30 is connected to a coil pulled out of the voice coil 21 on the diaphragm 24, Between the voice coil bobbin 22 and the damper 23, between the damper 23 and the frame 20, between the voice coil bobbin 22 and the diaphragm 24,
Between diaphragm 24 and edge 25, edge 25 and frame 20
Space, between edge 25 and gasket 26, dust cap 2
An adhesive mainly composed of chloroprene, nitrile rubber or the like and an acrylic resin-based adhesive have been used for the connection between the diaphragm 7 and the diaphragm 24.

Further, the connection between the terminal 29 and the gold wire 30 and the connection between the voice coil 21 and the gold wire 30 usually have a configuration using a solder having a liquidus temperature of 200 ° C. or less.

[0006]

However, if the above-mentioned conventional loudspeaker is thrown in at a high temperature of 380.degree.

That is, the voice coil bobbin 22, the diaphragm 24, the dust cap 27, and the gasket 26 mainly composed of kraft pulp paper are carbonized and burned, and the damper 23 mainly composed of cotton cloth is also carbonized and burned.

Also, the terminals 29 are carbonized to significantly lower the mechanical strength, the adhesive is carbonized to lower the adhesive strength, the members joined by the adhesive are peeled off, and the zinc plating applied to the frame 20 is also reduced. Peel off.

Further, between the voice coil 21 and the gold wire 30,
There is a problem that the solder between the terminal 29 and the gold wire 30 also melts and the solder is scattered by the operation.

The present invention solves the above-mentioned conventional problems and solves the above problem.
At a high temperature of 15 ° C. for 15 minutes, and 380
An object of the present invention is to provide a speaker capable of exhibiting excellent heat resistance characteristics with a small change in sound pressure frequency characteristics at room temperature before and after continuous operation at 15 ° C. for 15 minutes.

[0011]

According to the present invention, there is provided a speaker according to the present invention, wherein at least a diaphragm and an edge of a diaphragm, an edge and a dust cap are mainly composed of a phenol resin fiber and an aromatic polyamide fiber. The cured base material is impregnated with an inorganic coating agent containing silica as a main component and cured, and the damper is formed of a base material containing phenol resin fibers as a main component, and the gasket is made of a base material containing aromatic polyamide fibers as a main component. In addition to being formed of a material, the voice coil bobbin and the damper, the voice coil bobbin and the diaphragm, the edge and the frame, the damper and the frame, the dust cap and the diaphragm were bonded with an adhesive containing silicon as a main component. Things.

[0012]

With this configuration, even if the continuous operation is performed for 15 minutes in an atmosphere under a high temperature of 380 ° C., the voice coil bobbin, the diaphragm, the edge, the dust cap, the damper, the gasket are burned out, the adhesive is peeled off, and the frame is removed. The peeling of the coating film does not occur, the solder does not come off between the voice coil and the gold thread, and the solder between the terminal and the gold wire does not occur, and excellent heat resistance can be exhibited.

[0013]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a half section showing the configuration of a speaker according to the embodiment. In FIG.
Is a lower plate, 3 is a magnet, 4 is an upper plate, 5 is a frame, 6 is a voice coil, 7 is a voice coil bobbin,
8 is a damper, 9 is a diaphragm, 10 is an edge, 11 is a gasket, 12 is a dust cap, 13 is a terminal plate, 14 is a terminal, and 15 is a voice coil by connecting both ends to the voice coil bobbin 7 and the terminal 14, respectively. 6 is a gold thread wire that electrically connects the terminal 6 and the terminal 14.

The diaphragm 9, the edge 10, and the dust cap 12 are mainly composed of, for example, phenol fiber and aramid fiber, mixed with kraft pulp to form a desired shape, and further coated with silica as a main component. Agent,
For example, it is configured to be impregnated with polymethoxypolysiloxane generated by a heat polymerization reaction of a hydrolyzate of tetramethoxysilane.

Further, the damper 8 is formed by impregnating a woven fabric of phenol resin fibers with a phenol resin and curing the woven fabric.
The gasket 11 is formed mainly of an aromatic polyamide fiber.

Also, a voice coil bobbin 7 and a damper 8
Between the voice coil bobbin 7 and the diaphragm 9, between the edge 10 and the frame 5, between the damper 8 and the frame 5, between the dust cap 12 and the diaphragm 9 or the voice coil bobbin 7,
The components are connected by an adhesive containing silicon as a main component.

A description will be given of a change after the thus constructed speaker according to the present embodiment is put into an atmosphere at 380 ° C. for 15 minutes.

Diaphragm 9, edge 10, dust cap 1
No. 2 is mainly composed of phenol fibers and aromatic polyamide fibers and is hardened by a silica impregnating agent.
The change in the sound pressure frequency characteristics before and after the application of 80 ° C. is also small.

Further, since the damper 8 is mainly made of phenol resin fibers, it is carbonized but does not burn out, and its deformation and change in physical properties are small.

Further, since the gasket 11 is mainly made of aromatic polyamide fiber and is carbonized, no abnormality such as burning or deformation occurs.

Also, a voice coil bobbin 7 and a damper 8
Between the voice coil bobbin 7 and the diaphragm 9, between the edge 10 and the frame 5, between the damper 8 and the frame 5, between the dust cap 12 and the diaphragm 9, or between the voice coil bobbin 7 with an adhesive mainly containing silicon. Since the bonding is performed, the adhesive is carbonized, but the above-mentioned member is not separated.

Further, since both ends of the gold wire 15 are directly connected to the voice coil bobbin 7 and the terminal 14 and do not pass through the diaphragm 9, even when the diaphragm 9 which comes into direct contact with the high temperature atmosphere is carbonized even when the speaker system is constructed, No electrical short circuit occurs due to the diaphragm 9, and the heat resistance can be greatly improved.

(Embodiment 2) A second embodiment of the present invention will be described.

In this embodiment, the structure of the frame 5 is obtained by applying a coating mainly composed of a silicon resin to an iron material processed into a desired shape, and other structures are the same as those of the first embodiment. The same is true, and the heat resistance at a high temperature is exactly the same as in the first embodiment.

In this embodiment, since the frame 5 has a structure in which a silicon-based coating is applied, the coating film does not peel off even when exposed to an atmosphere of 380 ° C. for 15 minutes. Therefore, as in the case of a zinc-plated frame that has been widely used in the past, when the plating is peeled off from the frame, the frame and the edge, and the frame and the damper are peeled off. It is possible to provide a more reliable loudspeaker by avoiding an abnormality such as an electrical short-circuit caused by contact with the contact member or the like, and an abnormal sound generated by the peeled plating entering the magnetic gap.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described.

In this embodiment, the structure of the terminal plate 13 is formed by impregnating and curing a silicon-based resin in a glass cloth base material, and other structures are the same as those of the first embodiment. First in heat resistance at high temperatures
This is exactly the same as the embodiment.

In this embodiment, since the terminal plate 13 is mainly composed of a glass cloth impregnated with a silicon resin, it does not carbonize even when exposed to an atmosphere of 380 ° C. for 15 minutes.
Little decrease in mechanical strength. Therefore, as in the case of a terminal plate made of a phenolic resin composite which has been widely used in the past, the mechanical strength is significantly reduced by carbonization, and the terminal is not broken by the stress of the electric cord or the like connected to the power supply side. It is possible to avoid an electrical short circuit due to a contact between the members or the like, or to prevent disconnection of the gold wire 15 and a connection portion of the voice coil bobbin 7 between the gold wire 15 and the voice coil 6 to provide a more reliable speaker. Can be.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described.

In this embodiment, the voice coil 6 is made of a metal bobbin and a voice coil bobbin 7 made of a reinforcing paper mainly composed of an aromatic polyamide, and an insulating kraft paper piece is further provided on the reinforcing paper. The gold wire 15 connected to the beginning and end of the coil wound on the bobbin is bonded with a polyamide adhesive, and the bonded portion of the gold wire 15 is bonded on the polyamide adhesive with an adhesive containing silicon as a main component. The structure is reinforced, and the other structure is the same as that of the first embodiment. The heat resistance at a high temperature is exactly the same as that of the first embodiment.

In this embodiment, since the voice coil bobbin 7 is formed of a reinforcing paper mainly composed of a metal bobbin and an aromatic polyamide, the voice coil bobbin 7 does not burn out even when exposed to an atmosphere of 380 ° C. for 15 minutes. In addition, since the gold wire 15 is bonded to a piece of kraft paper on a reinforcing paper containing aromatic polyamide as a main component with a polyamide adhesive, the bonding strength of the gold wire 15 becomes practically sufficient. By reinforcing with an adhesive, the adhesive strength at high temperatures can be sufficiently secured, and a more reliable speaker can be provided.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described.

In this embodiment, the voice coil 6 and the gold wire 15
Between the terminal 14 and the gold wire 15
The configuration is such that a solder of 0 ° C. or higher is used. The other configuration is the same as that of the first embodiment, and the heat resistance at a high temperature is exactly the same as that of the first embodiment.

In this embodiment, the voice coil 6 and the gold wire 15
Between the terminal 14 and the gold wire 15
Since the configuration using the solder of 0 ° C. or higher is used, the voice coil which is generated by melting and scattering of the solder at the time of the operation of the speaker at a high temperature, such as the conventional solder having a liquidus temperature of 200 ° C. or lower, is used. And between the gold wire and the terminal and the gold wire can be avoided, and a more reliable speaker can be provided.

In the above description of the embodiment of the present invention, an external magnetic circuit composed of a center pole 1, a lower plate 2, a magnet 3, and an upper plate 4, as shown in FIG. However, the present invention is not limited to this, and a similar effect can be obtained even if, for example, an internal magnet type magnetic circuit is used.

Further, the dust cap 12 has been described as having a configuration in which a phenol fiber and an aromatic polyamide fiber are the main components and a coating agent mainly containing the silica is impregnated therein. It is not limited, and for example, even if it is made of metal such as aluminum,
The same effect can be obtained as long as it can be used at a high temperature of ° C.

Although the dust cap 12 has been described as being connected to the diaphragm 9, the voice coil bobbin 7
It may be of a configuration that is coupled to.

[0039]

As described above, the speaker according to the present invention has the following features.
Diaphragm, edge and dust cap are made of phenolic resin fiber and aromatic polyamide fiber as the main components. Coating with silica as the main component is applied. It is possible to greatly improve the reliability with respect to heat resistance by forming a structure in which the main component is made of Group III polyamide fiber and the connection between each member except the magnetic circuit is bonded with an adhesive containing silicon as the main component. 380 ℃
It is possible to realize a highly reliable speaker with extremely small change in sound pressure characteristics before and after being placed in a 380 ° C. atmosphere.

[Brief description of the drawings]

FIG. 1 is a front half sectional view showing a configuration of a speaker according to an embodiment of the present invention.

FIG. 2 is a front half sectional view showing the configuration of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center pole 2 Lower plate 3 Magnet 4 Upper plate 5 Frame 6 Voice coil 7 Voice coil bobbin 8 Damper 9 Diaphragm 10 Edge 11 Gasket 12 Dust cap 13 Terminal plate 14 Terminal 15 Gold wire

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI H04R 9/04 104 H04R 9/04 104B (56) References JP-A-4-115700 (JP, A) JP-A-53-48520 (JP, A) JP-A-4-115697 (JP, A) JP-A-4-86199 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04R 9/02 101 H04R 9 / 02 103 H04R 7/20 H04R 9/00 H04R 9/04 102 H04R 9/04 104

Claims (5)

(57) [Claims] 1. A magnetic circuit having a magnetic gap formed therein, a frame coupled to an upper surface of the magnetic circuit, and a gasket coupled to a peripheral edge of the frame along with a gasket through an edge coupled to an outer peripheral portion. A diaphragm coupled to a voice coil that fits into the center, a dust cap coupled to an upper surface of a central portion of the diaphragm, a damper coupled to support the voice coil at an inner peripheral portion, and the voice coil A speaker comprising a terminal plate coupled to the frame for connecting the gold wire drawn out of the diaphragm, at least the diaphragm and the edge among the diaphragm, the edge, and the dust cap mainly include a phenol fiber and an aromatic polyamide fiber. And a base material impregnated with an inorganic coating agent containing silica as a main component. Is a base material mainly composed of phenolic resin fibers, and the gasket has a configuration composed of a base material mainly composed of aromatic polyamide fibers,
The bobbin of the voice coil and the damper, the bobbin of the voice coil and the diaphragm, the edge and the frame, the damper and the frame, and the coupling of the dust cap are each bonded with an adhesive containing silicon as a main component. Speaker. 2. The frame is made of an iron material whose surface is coated with a silicone resin as a main component.
The described speaker. 3. The speaker according to claim 1, wherein the terminal plate is made of a glass cloth base material impregnated with a resin containing a silicon-based resin as a main component. 4. A bobbin is formed from a metal bobbin and a reinforcing paper mainly composed of an aromatic polyamide, a voice coil is provided with an insulating piece of kraft paper on the reinforcing paper, and the bobbin is wound on the kraft paper. The gold wire connected to the start and end of the coil is formed by bonding a polyamide-based adhesive and applying an adhesive containing silicon as a main component on the polyamide-based adhesive. 3. The speaker according to any one of 3. 5. The speaker according to claim 1, wherein the connection between the voice coil and the gold wire and the connection between the terminal and the gold wire are connected by a solder having a liquidus temperature of 300 ° C. or higher. .