JPH08116589A - Speaker - Google Patents

Abstract

(57) [Abstract] [Purpose] Regarding speakers used in various audio equipment,
An object of the present invention is to provide a speaker having excellent heat resistance that can be continuously operated even in a high temperature atmosphere. [Structure] Vibration plate 9, edge 10, dust cap 12
Uses a silica-based coating on a base material composed mainly of phenolic resin fibers and aromatic polyamide fibers,
Is composed of phenol resin fiber as a main component, the gasket 11 is composed of aromatic polyamide fiber as a main component, and the frame 5 is coated with silicon, and the above-mentioned members are bonded by a silicone adhesive. In the atmosphere 1
It is possible to obtain a speaker having excellent heat resistance that can be continuously operated for 5 minutes.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat resistant speaker which can be used even under high temperature, among speakers used in various audio equipment.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a loudspeaker capable of withstanding use at high temperatures in the fields of emergency broadcasting such as fire and muffling of automobiles. 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, 16 is a center pole, 17 is a lower plate having the center pole 16, and 18 is an upper surface of the lower plate 17. A ring-shaped magnet which is coupled to the magnet and is magnetized in the thickness direction.
8 is connected to the upper surface of the center pole 16
A ring-shaped upper plate formed so as to form a magnetic gap with the outer peripheral surface of the frame, 20 is a frame coupled to the upper surface of the upper plate 19, and 21 is held in the magnetic gap and used for electrical input. A voice coil 22 that oscillates in response to the voice coil 22. A voice coil bobbin 22 that forms the voice coil 21 and transmits the generated driving force to the vibration system.
An inner and outer peripheral portions 23 of the damper 23 are respectively coupled to a middle portion of the voice coil bobbin 22 and a middle portion of the frame 20 to hold the voice coil 21 in the magnetic gap without eccentricity, and to provide a stiffness necessary for the speaker, 24 Is a diaphragm coupled to the upper part of the voice coil bobbin 22, and 25 is a diaphragm 2 having inner and outer peripheral portions coupled to the outer peripheral portion of the diaphragm 24 and the peripheral portion of the frame 20, respectively.
4 which allows the vibration of 4 and blocks the radiated sound on the back surface of the diaphragm 24, 26 is a gasket connected to the upper surface of the outer periphery of the edge 25, 27 is the upper portion of the voice coil bobbin 22, and the diaphragm 24 A dust cap connected to the upper surface of the central portion, 28 is a terminal plate connected to the frame 20, 29 is a terminal connected to the terminal plate 28, 3
0 has one end connected to this terminal 29 and the other end connected to the coil drawn from the voice coil 21 and the diaphragm 2.
4 is connected to the voice coil 21 and the terminal 2
9 is a gold thread wire that is electrically connected.

In the conventional loudspeaker having such a structure, the frame 20 is generally made of an iron plate processed into a desired shape and zinc plated, and the voice coil bobbin 22, the diaphragm 24, the dust cap 27 and the gasket 26 are made of kraft pulp. Formed from a stack of paper and also a damper 23
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 the coil drawn from 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 the diaphragm 24 and the edge 25, between the edge 25 and the frame 20
Space, edge 25 and gasket 26, dust cap 2
For bonding between 7 and the diaphragm 24, an adhesive containing chloroprene, nitrile rubber or the like as a main component, and an acrylic resin adhesive were used.

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

[0006]

However, there is a problem that if the above-mentioned conventional speaker is put under a high temperature of 380 ° C., it becomes inoperable in a short time.

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

Further, the terminals 29 are also carbonized to significantly reduce the mechanical strength, the adhesive is also carbonized to reduce the adhesive strength, the members joined by the adhesive are peeled off, and the zinc plating applied to the frame 20 is also removed. It peels off.

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 is also melted and the solder is scattered by the operation.

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

[0011]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises a vibrating plate, an edge and a dust cap, wherein at least the vibrating plate and the edge are composed mainly of a phenol resin fiber and an aromatic polyamide fiber. The substrate is impregnated with an inorganic coating agent containing silica as the main component and cured, and the damper is formed with the substrate containing phenol resin fiber as the main component, and the gasket is composed of aromatic polyamide fiber as the main component. It is made of a material, and the voice coil bobbin and the damper, the voice coil bobbin and the diaphragm, the edge and the frame, the damper and the frame, and the dust cap and the diaphragm are bonded with a silicone-based adhesive. It is a thing.

[0012]

With this configuration, even if the continuous operation is performed for 15 minutes in the atmosphere at a high temperature of 380 ° C., the voice coil bobbin, the diaphragm, the edge, the dust cap, the damper, the gasket are burned, the adhesive is peeled off, and the frame is removed. No peeling of the coating film of No. occurs, solder does not come off between the voice coil and the gold thread, and between the terminal and the gold thread wire, 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 cross-sectional view showing the structure of the speaker according to the embodiment, in which 1 is a center pole and 2 is a center pole.
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 6 and the terminal 14.

The vibrating plate 9, the edge 10 and the dust cap 12 have, for example, a phenol fiber and an aramid fiber as main components, and kraft pulp is mixed and formed into a desired shape to further form a coating having silica as a main component. Agent,
For example, it is configured such that polymethoxypolysiloxane produced by a thermal polymerization reaction of a hydrolyzate of tetramethoxysilane is impregnated.

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

Further, the voice coil bobbin 7 and the 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, and between the dust cap 12 and the diaphragm 9 or the voice coil bobbin 7.
Each of them is configured to be bonded by an adhesive containing silicon as a main component.

A change after the speaker according to this embodiment having the above-mentioned structure is put in an atmosphere of 380 ° C. for 15 minutes will be described.

Vibration plate 9, edge 10, dust cap 1
No. 2 has phenolic fibers and aromatic polyamide fibers as its main components and is hardened with a silica-based impregnating agent, so it is carbonized but does not burn out, and its deformation and rigidity change are small.
The change in the sound pressure frequency characteristics before and after 80 ° C. is also small.

Further, since the damper 8 is mainly composed of phenol resin fiber, it is carbonized, but is not burned out, and deformation and change in physical properties are small.

Further, since the gasket 11 contains aromatic polyamide fiber as a main component, it is carbonized, but no abnormality such as burning or deformation occurs.

Further, the voice coil bobbin 7 and the damper 8
The space between the voice coil bobbin 7 and the diaphragm 9, the edge 10 and the frame 5, the damper 8 and the frame 5, the dust cap 12 and the diaphragm 9, or the voice coil bobbin 7 is made of an adhesive containing silicon as a main component. Since they are bonded, the adhesive is carbonized, but the above members cannot be separated.

Further, since both ends of the gold wire 15 are directly joined to the voice coil bobbin 7 and the terminal 14 without passing through the diaphragm 9, even when the diaphragm 9 which is in direct contact with the high temperature atmosphere is carbonized even when the speaker system is constructed, The electrical short circuit due to the diaphragm 9 does not occur, and the heat resistance performance can be greatly improved.

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

In this embodiment, the frame 5 is constructed by coating an iron material processed into a desired shape with a coating containing silicon resin as a main component, and other constructions are the same as those of the first embodiment. The same is true and the heat resistance at high temperature is exactly the same as in the first embodiment.

In the present embodiment, since the frame 5 is made of silicon-based coating, the coating film does not peel off even when exposed to an atmosphere of 380 ° C. for 15 minutes. Therefore, like the zinc plating frame that has been frequently used in the past, when the plating is peeled from the frame, the frame and the edge, and the frame and the damper are peeled, which causes the abnormal operation of the speaker and the plating which is peeled from the frame. It is possible to provide a speaker with higher reliability by avoiding an electrical short circuit caused by contact with the like or the like, and an abnormality such that the plated plating enters the magnetic gap and produces an abnormal sound.

(Embodiment 3) A third embodiment of the present invention will be described below.

In this embodiment, the terminal board 13 is formed by impregnating a glass cloth base material with a silicone resin and curing it. The other construction is the same as that of the first embodiment. 1st in heat resistance at high temperature
Is exactly the same as the embodiment of

In this embodiment, since the terminal plate 13 is mainly composed of a glass cloth impregnated with a silicon resin, it is not carbonized even when exposed to an atmosphere of 380 ° C. for 15 minutes.
Little decrease in mechanical strength. Therefore, the mechanical strength is remarkably reduced by carbonization like a terminal board made of a phenol resin composite which has been widely used in the past, and the terminal is not destroyed by the stress of the electric cord or the like connected to the power source side. It is possible to avoid an electrical short-circuit due to a contact between each other or a disconnection of the gold wire 15 and a connecting portion of the voice coil 6 and the voice coil 6 in the voice coil bobbin 7, and to provide a speaker with higher reliability. You can

(Fourth Embodiment) The fourth embodiment of the present invention will be described below.

In this embodiment, the voice coil 6 is formed of a reinforcing paper containing a metal bobbin and an aromatic polyamide as a main component to form a voice coil bobbin 7, and an insulating kraft paper piece is provided on the reinforcing paper. Gold wire 15 connected to the start and end of the coil wound around the bobbin is bonded with a polyamide adhesive, and the bonded portion of gold wire 15 is bonded onto the polyamide adhesive with an adhesive containing silicon as a main component. The structure is reinforced, and other structures are the same as those of the first embodiment, and the heat resistance at high temperature is also the same as that of the first embodiment.

In the present embodiment, the voice coil bobbin 7 is formed of a reinforcing paper containing a metal bobbin and an aromatic polyamide as main components, so that the voice coil bobbin 7 is not burned out even when exposed to an atmosphere of 380 ° C. for 15 minutes. In addition, since the gold yarn wire 15 is joined to the kraft paper piece on the reinforcing paper containing aromatic polyamide as the main component with the polyamide adhesive, the adhesive strength of the gold yarn wire 15 becomes practically sufficient. By reinforcing with an adhesive, the adhesive strength at high temperature can be sufficiently secured, and a speaker with higher reliability can be provided.

(Fifth Embodiment) The fifth embodiment of the present invention will be described below.

In this embodiment, the voice coil 6 and the gold thread 15 are used.
, The liquidus temperature is 30 at the joint between the terminal 14 and the gold wire 15.
The constitution is such that solder of 0 ° C. or higher is used, the other constitution is the same as that of the first embodiment, and the heat resistance at high temperature is also the same as that of the first embodiment.

In this embodiment, the voice coil 6 and the gold wire 15
, The liquidus temperature is 30 at the joint between the terminal 14 and the gold wire 15.
Since the structure uses solder of 0 ° C or higher, the voice coil that is generated by melting and scattering of the solder when the speaker operates at high temperature, like the solder that has been conventionally used and has a liquidus temperature of 200 ° C or lower It is possible to avoid a conduction failure between the wire and the gold wire, and between the terminal and the gold wire, and it is possible to provide a speaker with higher reliability.

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

Further, the dust cap 12 has been described by using a structure in which phenol fiber and aromatic polyamide fiber are main components, and a coating agent containing silica as the main component is impregnated, but the present invention is not limited to this. The material is not limited to, but is 380 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 has been described.
It may be configured to be coupled to.

[0039]

As described above, the speaker according to the present invention is
The diaphragm, the edge, and the dust cap are coated with phenol resin fiber and aromatic polyamide fiber as the main components, and the silica coating is used as the main component, the damper is formed with the phenol resin fiber as the main component, and the gasket is aromatic. It is possible to greatly improve the reliability of heat resistance by forming the group A polyamide fiber as the main component and connecting each member except the magnetic circuit with the adhesive containing silicon as the main component. 380 ° C
It is possible to realize a highly reliable speaker that can be continuously operated for 15 minutes in the atmosphere described above, and has a very small change in sound pressure characteristics before and after being placed in the atmosphere at 380 ° C.

[Brief description of 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]

 1 Center Pole 2 Lower Plate 3 Magnet 4 Upper Plate 5 Frame 6 Voice Coil 7 Voice Coil Bobbin 8 Damper 9 Vibration Plate 10 Edge 11 Gasket 12 Dust Cap 13 Terminal Board 14 Terminal 15 Gold Wire

Claims (5)

[Claims] 1. A magnetic circuit having a magnetic gap, a frame coupled to an upper surface of the magnetic circuit, a frame coupled to a peripheral edge of the frame through an edge coupled to an outer peripheral portion of the frame, and the magnetic gap. A vibration plate having a voice coil fitted in the center thereof, a dust cap connected to an upper surface of a central portion of the vibration plate, a damper connected to support the voice coil at an inner peripheral portion thereof, and the voice coil. In a speaker including a terminal plate connected to the frame for connecting a gold wire drawn from the above, at least the diaphragm and the edge and the dust cap mainly include phenol fiber and aromatic polyamide fiber in the diaphragm and the edge and the dust cap. The above-mentioned damper comprises a base material as a component impregnated with an inorganic coating agent containing silica as a main component. Is a base material containing a phenol resin fiber as a main component, and the gasket is a structure including a base material containing an aromatic polyamide fiber as a main component,
The voice coil bobbin and the damper, the voice coil bobbin and the diaphragm, the edge and the frame, the damper and the frame, and the dust cap are bonded by 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 silicon resin as a main component. 4. A voice coil, wherein a bobbin is formed from a metal bobbin and a reinforcing paper containing aromatic polyamide as a main component, an insulating kraft paper piece is provided on the reinforcing paper, and the bobbin is wound on the kraft paper. The gold thread wire connected to the beginning and end of the coil is joined with a polyamide adhesive, and the polyamide adhesive is applied with an adhesive containing silicon as a main component. 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 between the terminal and the gold wire are made by soldering with a liquidus temperature of 300 ° C. or higher. .