JPH07298392A - Speaker - Google Patents

Abstract

PURPOSE:To enable continuous driving with large electric power by increasing the heat conductivity of a voice coil part and conducting the heat, generated by the coil, away. CONSTITUTION:A core material 23c having metallic thin wires of high heat conductivity arranged in parallel is sandwiched between surface materials 23a and 23b made of glass-fiber reinforced plastic sheets. This composite member sheet 23 is formed cylindrically to obtain the voice coil 22. The outer peripheral surface of the bobbin at its lower end is wound with a coil 9, which is held as an annular magnetic circuit so that vibration is made free. Consequently, the coil 9 generates heat with a driving current, the heat radiation effect is improved, and the continuous driving with large electric power is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in a large input sound reproducing apparatus.

[0002]

2. Description of the Related Art In recent years, in a concert hall or an outdoor sound reproducing system, a sound reproducing device for reproducing a large volume by an electric auxiliary means has been used. The structure of the speaker, including the one used in the sound reproducing device for such an application, is often as shown in FIG. Here, a general conventional speaker 1 will be described with reference to FIG.

FIG. 16 is a half sectional view showing the structure of the speaker 1. In the figure, at the lower end of the annular frame 2,
An annular magnetic circuit 6 including a center pole 3, a magnet 4 and a top plate 5 is formed. In the annular gap 7 between the upper outer periphery of the center pole 3 and the inner periphery of the top plate 5,
A high-density magnetic flux is formed, and the voice coil bobbin 8 is held so as to be vertically movable.

The voice coil bobbin 8 is generally a member formed by molding thin paper into a cylindrical shape, and a coil 9 is provided on the outer periphery of the lower end thereof.
Has been wound. The coil 9 generates an electromagnetic force to cause the voice coil bobbin 8 to perform a piston movement when an acoustic drive current is applied, and is made of, for example, a wire material made of aluminum or copper. Reinforcing paper 10 is wrapped around the outer peripheral portion of the voice coil bobbin 8 except for the lower end portion thereof to ensure the rigidity of the voice coil bobbin. Such a voice coil bobbin 8
The diaphragm 11 and the suspension 12 are fixed to each other. The diaphragm 11 is attached to the frame 2 via the edge 13,
The suspension 12 is directly attached to the frame 2 and is oscillatably held.

In the speaker 1 thus constructed, when an acoustic drive current is input to the coil 9, an electromagnetic force is generated by the drive current and the magnetic flux in the air gap 7, and the suspension 12 and the edge 13 hold the electromagnetic force. The diaphragm 11 vibrates and outputs sound.

[0006]

However, in the conventional speaker 1 shown in FIG. 16, the driving current of the coil 9 when outputting high-output sound is large, and the Joule heat generated by this current is also large. Therefore, there is a problem that the voice coil bobbin 8 including the coil 9 generates heat. These rising temperatures are proportional to the driving power, but due to such a temperature rise, the insulating layer of the coil 9 is destroyed by heat to cause insulation failure, or the adhesive force between the coil windings is reduced, so that the coil 9 is damaged. There was also the problem of doing. Further, when driven with high power for a long time, the heat of the coil 9 may be transferred to the suspension 12 and the diaphragm 11, and the suspension 12 and the diaphragm 11 may ignite.

The present invention has been made in view of such conventional problems, and an object thereof is to prevent the performance of the speaker from being deteriorated due to the temperature rise of the voice coil of the speaker. In particular, the inventions of claims 1 to 7 aim to realize a speaker capable of continuously outputting a high-output sound with a larger driving power by cooling the voice coil of the speaker.

It is an object of the present invention to realize a speaker capable of preventing damage to the voice coil and easily reproducing and restoring when the driving power is large. A tenth aspect of the present invention has an object to realize a speaker that prevents ignition of a suspension holding a voice coil bobbin and prevents a fire.

[0009]

According to a first aspect of the present invention, there is provided a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an outer circumference of the voice coil bobbin. A speaker having a ring-shaped top plate located at the center, and a center pole inserted into the voice coil bobbin, wherein the voice coil bobbin is a sheet-like core material in which fine metal wires coated with an insulating material are arranged in parallel. And a surface material composed of a glass fiber reinforced plastic sheet bonded to both sides of the core material, and a composite member sheet in which the core material and the surface material are integrated is formed into a cylindrical shape. Is characterized in that a conductor is wound and fixed in a single layer or multiple layers on the outer peripheral surface of a voice coil bobbin.

According to the invention of claim 2 of the present application, a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an annular member located on the outer periphery of the voice coil bobbin. A speaker having a top plate and a center pole inserted inside the voice coil bobbin, wherein the voice coil bobbin comprises:
It has a sheet-like core material in which fine metal wires coated with an insulating material are arranged in parallel, and a surface material that is bonded to both surfaces of the core material and is composed of a glass fiber reinforced plastic sheet. The coil is formed by cylindrically forming a composite member sheet in which a surface material is integrally adhered to a portion, and a coil is formed by winding a conductor in a single layer or multiple layers on the exposed portion of the core material on the outer peripheral surface of the voice coil bobbin. It is characterized in that the lines are fixed.

The invention according to claim 3 of the present application is a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a dust cap for covering an end face of the voice coil bobbin, a coil wound around the voice coil bobbin, and a voice. An annular top plate located on the outer periphery of the coil bobbin,
A speaker having a center pole inserted inside a voice coil bobbin, wherein the voice coil bobbin is a sheet-shaped core material in which fine metal wires covered with an insulating material are arranged in parallel, and the voice coil bobbin is adhered to both surfaces of the core material. , A composite material sheet having a surface material composed of a glass fiber reinforced plastic sheet, and integrally bonding the surface material to a part of a core material in a cylindrical shape. The coil is a voice coil bobbin. The conductor is wound in a single layer or in multiple layers on the exposed portion of the core material on the outer peripheral surface of the lower end of the, and the dust cap is used to bond the exposed portion of the core material on the upper peripheral surface of the voice coil bobbin. It is characterized by being a substantially spherical shell shape attached as.

According to the invention of claim 4 of the present application, the dust cap is characterized in that a fold for heat dissipation is provided on a substantially spherical shell-shaped surface.

According to a fifth aspect of the present invention, a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an annular member located on the outer peripheral portion of the voice coil bobbin. A speaker having a top plate and a center pole inserted inside a voice coil bobbin, wherein a plurality of cooling fins that are integrally formed with a concave portion that contacts the outer periphery of the coil and the concave portion and that dissipates heat conducted from the coil are formed. Has a protrusion,
The top plate has a cooling member that is in close contact with the outer peripheral surface of the coil and the outer peripheral surface of the voice coil bobbin, and the top plate is provided with a notch portion that provides a space for allowing the cooling member to freely vibrate. It is a feature.

According to a sixth aspect of the present invention, a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an annular member located on the outer periphery of the voice coil bobbin. A speaker having a top plate and a center pole inserted inside the voice coil bobbin, wherein the voice coil bobbin comprises:
The linear protrusion is formed in a spiral shape on a part of the outer periphery of the voice coil bobbin.The coil has a single-layer or multi-layer winding of conductor on the outer peripheral surface of the voice coil bobbin on which the linear protrusion is not formed. It is characterized in that the lines are fixed.

According to a seventh aspect of the present invention, a diaphragm that gives air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an annular member located on the outer periphery of the voice coil bobbin. A speaker having a center plate inserted into a top plate and a voice coil bobbin, wherein the top plate has a plurality of thin through-holes radially extending from an outer peripheral surface to an inner peripheral surface inside an annular magnetic band. It is formed, and is characterized in that an annular hollow member having an annular slit communicating with the through hole and a ventilation hole for supplying air to the slit is provided on the outer peripheral portion of the top plate.

According to the invention of claim 8 of the present application, a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an annular member located on the outer periphery of the voice coil bobbin. A speaker having a top plate and a center pole inserted inside the voice coil bobbin, wherein an overcurrent protection element having a resistance value larger than that of the conductor portion of the coil is provided in series with the coil on the outer peripheral portion of the voice coil bobbin through a terminal. It is characterized by that.

According to a ninth aspect of the present invention, a diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a coil wound around the voice coil bobbin, and an annular member located on the outer peripheral portion of the voice coil bobbin. A speaker having a top plate and a center pole inserted inside the voice coil bobbin, wherein a temperature fuse that is blown by a temperature rise through a terminal is provided in series with the coil on the outer periphery of the voice coil bobbin. Is.

According to a tenth aspect of the present invention, a diaphragm that gives air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a suspension that vibratably holds the voice coil bobbin, a coil wound around the voice coil bobbin,
A speaker having an annular top plate located on an outer peripheral portion of a voice coil bobbin and a center pole inserted inside the voice coil bobbin, wherein the voice coil bobbin, the diaphragm, and the suspension use an adhesive layer having self-extinguishing property. It is characterized by being adhered.

[0019]

According to the invention of claim 1 of the present application having such a feature, when a driving current is applied to the coil wound around the voice coil bobbin, the coil receives an electromagnetic force and the diaphragm is integrated with the voice coil bobbin. Vibrate to. At that time, the heat generated in the coil is conducted to the core material. Since the core material is made of a sheet-like material in which fine metal wires are arranged in parallel, heat is radiated to the entire voice coil bobbin through the core material.

According to the invention of claim 2 of the present application, in addition to the function of claim 1, since the surface material is removed from the portion where the coil is fixedly wound, the heat of the coil is directly applied to the core material. Conduct.

According to the invention of claims 3 and 4 of the present application,
In addition to the effect of the second aspect, the heat generated in the coil is also conducted to the dust cap, so that the heat is dissipated into the air.

According to the invention of claim 5 of the present application, the Joule heat of the coil is dissipated into the air from the cooling member.

Further, according to the invention of claim 6 of the present application, an air flow is generated along with the vertical vibration of the voice coil bobbin, and the heat of the voice coil bobbin is diffused.

According to the invention of claim 7, the cooling air is forcibly sent to the coil through the hollow member and the through hole.

According to the invention of claim 8 of the present application, when an overcurrent flows through the coil, the overcurrent protection element is melted and the voice coil bobbin is prevented from overheating.

Further, according to the invention of claim 9 of the present application, the thermal fuse is blown before the coil heats up, thereby preventing the voice coil bobbin from overheating.

Further, according to the invention of claim 10 of the present application,
Even when the vibrating plate and the vicinity of the suspension reach the ignition point due to the temperature rise of the coil, the self-extinguishing agent contained in the adhesive layer prevents the ignition.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker of each embodiment of the present invention will be described below with reference to the drawings, focusing on the structure of a voice coil section. In each figure of the present embodiment, the same parts as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 shows a speaker 20 according to the first embodiment of the present invention.
3 is a partially cutaway perspective view showing the structure of a voice coil unit 21 used in FIG. As shown in the figure, the voice coil portion 21 is formed by winding the coil 9 around the lower end of a cylindrical voice coil bobbin 22. The voice coil bobbin 22 is shown in FIG.
As shown in (a), a composite member sheet 23 is used as a hobbin material, which is formed into a cylindrical shape. As shown in FIG. 2B, the composite member sheet 23 has, for example, glass fiber reinforced polyimide as the surface materials 23a and 23b, and the core material 23c is bonded from both sides with the surface materials 23a and 23b.

As shown in FIG. 2C, the core member 23c is a sheet-like member in which a fine wire material 24 having a high thermal conductivity such as aluminum or copper is covered with an insulating varnish, and a large number of the fine wire materials 24 are arranged in parallel by adhesion. Is. Such a member has a sandwich structure to form a composite member sheet 23. The composite member sheet 23 is formed into a cylindrical shape as shown in FIG. 1 to form the voice coil bobbin 22. Next, the coil 9 made of copper or aluminum wire is fixedly wound on the outer periphery of the lower portion of the voice coil bobbin 22 in a single layer or multiple layers.

The operation of the speaker 20 having the voice coil section 21 having such a structure will be described. When a drive current flows through the coil 9, Joule heat is generated due to the resistance of the wire material of the coil 9, and the temperature of the coil 9 itself rises. The heat generated in the coil 9 is transmitted to the core material 23c through the surface materials 23a and 23b. Since the core material 23c is formed by arranging a large number of metal fine wire rods 24 having high thermal conductivity in parallel, the generated heat is easily transmitted to the entire voice coil bobbin 22.

Therefore, as compared with the voice coil bobbin 8 shown in FIG. 16, in which heat is diffused into the surrounding air by radiation or convection from the coil 9 alone, the heat diffusion amount of the present embodiment is large. Increase to. Therefore, the temperature rise of the coil 9 is suppressed little. Moreover, voice coil bobbin 2
Since 2 is a sandwich structure, it is lightweight and has high rigidity, and it is also effective in strengthening mechanical buckling that tends to occur due to piston vibration. Further, since the core material 23c is a metal coated with an insulating varnish, as compared with the case where a continuous metal foil is used as the core material 23c,
No eddy current conductor path is formed. Therefore, no eddy current is generated in the core material 23c and no secondary heat generation occurs.

Next, a speaker of the second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a half sectional view showing the structure of the speaker 30 of the second embodiment, and FIG. 4 shows the structure of the composite member sheet 33 used in this speaker 30. In FIG. 4, the composite member sheet 33 is composed of the surface materials 23a and 23b and the core material 23c as in the case shown in FIG. 2 (b). However, the composite member sheet 33 is different from that shown in FIG.
The structure a is removed with a constant width.

Such a composite member sheet 33 is formed into a cylindrical shape to form a voice coil bobbin 32. The coil 9 is fixedly wound in a single layer or multiple layers at the portion where the surface material 23a is removed. By doing so, as shown in FIG. 3, the core member 23c and the coil 9 come into contact with each other. The voice coil unit 31 configured as described above is used in the suspension 12
Is fixed to the diaphragm 11, and the diaphragm 1 is fixed by the edge 13.
1 is vibratably held by the frame 2. Also coil 9
Are held in a gap 7 of an annular magnetic circuit 6 composed of a magnet 4, a top rate 5 and a center pole 3.

In the speaker 30 thus constructed, when a drive current is applied to the coil 9, an electromagnetic force is generated by the magnetic flux in the air gap 7 and the drive current in the coil 9, and the diaphragm 1
1 makes a piston movement. Since the Joule heat generated in the coil 9 is directly conducted to the metallic core material 23c, the cooling effect of the voice coil bobbin 32 is further enhanced.

Next, the speaker of the third embodiment of the present invention will be described with reference to FIG. FIG. 5A is a half sectional view showing the structure of the speaker 40 of the third embodiment. In this figure, the voice coil bobbin 42 of the voice coil portion 41 is constituted by the same composite member sheet 33 of the second embodiment, and the surface material 23a is removed at a constant width from the lower end outer peripheral portion thereof. However, unlike the one shown in FIG. 4, the surface material 23a is also removed in a strip shape on the upper end outer peripheral portion of the composite member sheet 33. Such a composite member sheet 33 is formed into a cylindrical shape to form a voice coil bobbin 42. The coil 9 is fixedly wound in a single layer or multiple layers on the lower end portion where the surface material 23a is removed.

A hemispherical shell-shaped dust cap 43 is attached to the upper end of the voice coil bobbin 42. FIG. 5B is a cross-sectional view of the dust cap 43,
A fold 43a is formed on the surface of the spherical shell. The material of the dust cap 43 is a metal having a high thermal conductivity such as aluminum or silver. In this case, the core material 23c having a high thermal conductivity in the voice coil bobbin 42 and the dust cap 43 are directly joined. The suspension 12 and the vibrating plate 11 are attached to the voice coil unit 41 configured as described above, and the vibrating plate 11 is vibratably held by the frame 2.

In such a speaker 40, when a drive current flows through the coil 9, Joule heat is generated due to the resistance of the coil 9, and the temperature of the coil 9 rises. Coil 9
The heat generated in 1 is transmitted to the core material 23c in the lower layer. Core material 2
Since 3c is a metal having a high thermal conductivity, its heat is easily transmitted to the entire voice coil bobbin 42. Further, heat is conducted to the dust cap 43 connected to the voice coil bobbin 42, and is dissipated into the air through the folds 43a. In this way, the heat radiation effect is further enhanced as compared with the voice coil bobbins of the first and second embodiments. In addition, the dust cap 43 has a fold 43.
Even if a is not provided, the heat dissipation effect of the voice coil bobbin 42 is not significantly reduced.

Next, a speaker according to a fourth embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6A is a partial external view of the voice coil unit 51 used in the speaker of the fourth embodiment, and FIG. 6B is its sectional view. In FIGS. 6A and 6B, the voice coil bobbin 52 is a cylindrical member formed of a single-layer or double-layer sheet as in the conventional example. A driving coil 9 is wound around the outer periphery of the lower end of the voice coil bobbin 52. And coil 9
Including a cooling member 53 on the outer periphery of the voice coil bobbin 52.
Are attached.

The cooling member 53 is a strip-shaped member as shown in FIG. 6A, and is made of a metal such as aluminum or titanium which is lightweight and has a high thermal conductivity. The cooling member 53 is integrally formed with a concave portion 53a having an arc-shaped cross section so as to be in close contact with the outer peripheral portion of the coil 9, and a protruding portion 53b having a tree-shaped heat radiation fin formed above the concave portion 53a. is there. Such cooling members 53 are fixed to the outer periphery of the voice coil bobbin 52, for example, at four equal intervals.

On the other hand, as shown in FIG. 7, the top plate 5
Notches 54 are formed in, for example, four locations on the inner peripheral portion of the. The notch 54 provides a vibration space for the cooling member 53, and is provided at the same position as the mounting position of the cooling member 53. The groove width of the cutout portion 54 is set small enough not to come into contact with the cooling member, and constitutes the gap 7 of the annular magnetic circuit 6 together with the other inner peripheral portion of the top plate 5. The voice coil unit 51 thus configured is held by the frame by the edge and the suspension (not shown) as in the other embodiments.

In such a speaker, when a drive current is applied to the voice coil 9, Joule heat is generated due to the resistance of the coil 9, and the temperature of the coil 9 rises. Then, the heat generated in the coil 9 is transmitted to the cooling member 53. Since the cooling member is made of metal having a high thermal conductivity and has a large surface area, the conducted heat is dissipated into the air faster with the vibration of the voice coil unit 51. In this way, the heat dissipation effect is further enhanced. Since the cutout volume of the cutout portion 54 is smaller than the space of the gap 7, the magnetic flux density in the annular magnetic circuit 6 is hardly reduced. Therefore, it is possible to reproduce a large input sound without reducing the efficiency.

Next, a speaker according to a fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9. FIG. 8 is a perspective view of a voice coil unit 61 used in the speaker of the fifth embodiment, and FIG. 9 is a sectional view thereof. As shown in FIGS. 8 and 9, the voice coil bobbin 62 has a sheet-shaped member formed in a cylindrical shape, and at the same time, a spiral linear projection 63 is integrally formed along the outer peripheral portion of the cylinder. As shown in FIG. 9, the linear protrusion 63 is embossed so that its cross section has an outward arc shape. Such a linear protrusion 63 is formed only on the upper portion of the voice coil bobbin 62, and the coil 9 is wound around the lower end outer peripheral portion thereof as in the conventional example.

The voice coil unit 61 thus constructed
When a drive current is applied to the coil 9 in the speaker having, the air is taken in from the upper end portion of the voice coil bobbin 62 due to the diaphragm and the piston movement of the voice coil portion 61. This air flows along the linear protrusions 63. The linear protrusion 63 is continuously and spirally formed to the upper end of the voice coil bobbin 62, and the air flow advances downward along the voice coil bobbin 62 while drawing a vortex. The coil 9 is cooled by this air flow. Further, the linear protrusion 62 is formed by the voice coil bobbin 62.
Since it is formed in a spiral shape along the cylinder of and in a direction perpendicular to the vibration direction, it acts so as to resist the vibration of the voice coil bobbin 62. Therefore, the coil 9
The air in the vicinity is disturbed and is easily replaced with the air around the speaker, and the cooling effect is enhanced.

Next, a speaker according to a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a half sectional view showing the structure of the speaker 70 of the sixth embodiment.
FIG. 11 is a perspective view showing the internal structure of the top plate. As shown in FIG. 10, the voice coil portion 71 is formed by winding the coil 9 around a cylindrical voice coil bobbin 72 as in the conventional example, and the coil 9 is placed in the space 7 of the annular magnetic circuit 6.
It is held so that it can vibrate freely.

The top plate 73, which faces the center pole 3 through the gap 7, has a plurality of through holes 73a therein.
Is formed, and the hollow member 74 is attached to the outer peripheral portion. As shown in FIG. 11, the through holes 73a are formed radially from the side wall of the annular top plate toward the center thereof. FIG. 12 is an explanatory view of a mounting state of the hollow member 74, the pipe 75 connected to the hollow member 74, and the blower 76. As shown in the figure, the hollow member 74 is formed by annularly processing a member having a ventilation hole 74a having a rectangular cross section, and a slit 74b is formed on the inner peripheral surface thereof. As shown in FIG. 10, the slits 74b and the through holes 73a communicate with each other, and air is supplied to all the through holes 73a. As shown in FIG. 12, a communication hole 74 c is formed in a part of the outer circumference of the hollow member 74, and is connected to a blower 76 via a pipe 75.

In the speaker 70 thus constructed, the blower 76 supplies cooling air when the voice coil portion 71 is driven by the drive current of the coil 9.
That is, the air sent from the blower 76 is supplied to the hollow member 74 through the pipe 75 and the communication hole 74c. Ventilation hole 74
The air flowing into the a passes through the slits 74b and the through holes 7
3a. Then, this air is radiated from the end of the through hole 73a and cools the heat of the coil 9 driven at this position. The cooling air is radially supplied to the coil 9 from a plurality of angles, and prevents the temperature of the voice coil portion 71 from rising without hindering the vibration of the voice coil portion 71. Therefore, even if a high-power drive current is applied to the coil 9, the temperature rise can be positively prevented.

Next, the speaker of the seventh embodiment of the present invention will be described with reference to FIG. FIG. 13A shows the seventh
It is a side view which shows the structure of the voice coil part 81 of the speaker 80 of an Example. Unlike the previous embodiments, an overcurrent protection element is provided instead of the cooling member. A voice coil bobbin 82 having a coil 9 wound as shown in the figure.
Two terminals 83 are provided on the upper end portion 82a of the above, and an overcurrent protection element 84 is connected to the terminals 83. The overcurrent protection element 84 is a wire rod that is thinner and shorter than the wire rod of the coil 9.
The electric resistance per unit length is larger than that of the coil 9. Therefore, when an excessive current flows through the coil 9, the overcurrent protection element 84 melts due to Joule heat to cut off the drive current of the voice coil unit 81.

FIG. 13B is an enlarged view of the mounting portion of the overcurrent protection element 84. The voice coil portion 81 thus configured is joined to the diaphragm 11 at the upper end portion 82a and vibrates by the drive current of the coil 9. When the drive current of the coil 9 becomes excessive, Joule heat is generated by the resistance of the overcurrent protection element 84. If there is no such high resistance portion, the temperature of the coil 9 rises sharply and the melting point of the coil 9 exceeds the melting point of copper or aluminum, and the coil 9 itself melts. In that case, the coil 9 cannot be replaced unless the diaphragm 11 and the suspension (not shown) are removed from the frame, and repair is virtually impossible. However,
In this embodiment, since the overcurrent protection element 84 is provided on the upper end portion 82a of the voice coil bobbin 82, the overcurrent protection element 84 can be replaced and repaired. In this way, mechanical destruction of the coil 9 itself and the coil 9 due to fusing of the coil adhesive layer due to overheating can be prevented.

Next, the speaker of the eighth embodiment of the present invention will be described with reference to FIG. FIG. 14A shows the eighth
It is a side view which shows the structure of the voice coil part 91 of the speaker 90 of an Example. The upper end 92 of the voice coil bobbin 92
Two terminals 93 are provided in a similarly to the seventh embodiment, and a thermal fuse 94 is connected to these terminals 93. Figure 1
FIG. 4B is an enlarged view of the mounting portion of the thermal fuse 94. The structure of the speaker 90 is the same as that of the seventh embodiment except the temperature fuse 94, and the description thereof will be omitted.

In the speaker 90 having such a structure,
When a drive current is applied to the coil 9, Joule heat is generated due to the resistance of the coil wire material, and the temperature of the coil 9 rises. Therefore, when a large amount of power is momentarily applied, and when there is no high resistance portion, the temperature of the coil 9 rapidly rises,
The melting point of copper or aluminum, which is a coil material, is exceeded, and the coil 9 is fused. However, in this embodiment, the coil 9
The temperature fuse 94 rises to a higher temperature first. Further, the melting temperature of the thermal fuse 94 can be freely set as compared with that of the seventh embodiment. Therefore, if the melting temperature of the thermal fuse 94 is set sufficiently lower than the melting point of the coil 9,
The thermal fuse 94 blows before the coil 9. Therefore, it is possible to prevent the fusing of the coil 9 and the mechanical breakage of the coil 9 due to the breaking of the coil adhesive layer.

When the speaker 90 is driven by a large amount of electric power for a long time, the temperature of the entire voice coil section 91 rises, the adhesive layer of the coil 9 is broken, and the voice coil section 91 is destroyed.
The thermal fuse 94 operates prior to mechanical failure of the. Therefore, replacement and repair can be performed without removing the diaphragm 11 and the suspension from the frame.

Next, a speaker of the ninth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a half cross-sectional view showing the structure of the loudspeaker 100 of the ninth embodiment. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.
The voice coil unit 101 is a cylindrical voice coil bobbin 102 in which the coil 9 is wound around the lower end outer peripheral portion as in the conventional example. The coil 9 is held in the space 7 of the annular magnetic circuit 6 which is composed of the magnet 4, the top plate 5, and the center pole 3. Now, voice coil bobbin 10
2 is joined to the diaphragm 11 and the suspension 12 by adhesive layers 103a and 103b, respectively. Adhesive layer 103
Is an adhesive having a self-extinguishing property by containing a phosphorus compound, for example.

In the speaker 100 thus constructed, when the coil 9 is driven with a large amount of electric power for a long time, the temperature of the entire voice coil unit 101 rises. Then, the vicinity of the bonding point between the diaphragm 11 and the voice coil bobbin 102 and the vicinity of the suspension 12 also become high in temperature. The diaphragm 11 is usually made of paper and the suspension 12 is made of cotton cloth, but none of them has a high ignition point. However, in this embodiment, the voice coil bobbin 1
No. 02, the diaphragm 11 and the suspension 12 are fixed to each other via the adhesive layer 103 having self-extinguishing property. Therefore, even when the vicinity of the diaphragm 11 or the suspension 12 reaches the ignition point, The contained self-extinguishing agent acts to block oxygen and can prevent ignition.

[0055]

As described above in detail, according to the invention of claim 1 of the present application, the cooling surface area is effectively increased, and the temperature rise of the coil is suppressed. Further, since the voice coil bobbin has a sandwich structure, it is lightweight and has high rigidity, and is resistant to mechanical buckling against vibration. Further, since the core materials are insulated from each other, eddy current due to the drive current of the coil does not occur.

According to the invention of claim 2 of the present application, in addition to the effect of the invention of claim 1, the efficiency of heat conduction of the core material is further improved, so that the coil cooling effect is further enhanced.

According to the inventions of claims 3 and 4 of the present application,
In addition to the effect of the invention of claim 1, heat is also dissipated from the dust cap, so that the coil cooling effect is further enhanced.

According to the invention of claim 5 of the present application, the heat of the voice coil bobbin can be cooled by the cooling member without using the composite member sheet. Further, although a plurality of notches are provided in the top plate, since the intervals are small, they act as voids that form a magnetic circuit, and the efficiency of electromagnetic force does not decrease.

According to the invention of claim 6 of the present application, the air around the voice coil bobbin is easily replaced, and the coil is cooled by the air.

Further, according to the invention of claim 7 of the present application, by controlling the amount of air supplied to the hollow member, forced air cooling according to the electric power applied to the coil becomes possible.

According to the invention of claim 8 of the present application, replacement of the overcurrent protection element facilitates repair of damage to the speaker due to excessive power.

Further, according to the invention of claim 9 of the present application, by providing the temperature fuse, the temperature rise of the voice coil bobbin can be managed, and the damage of the speaker due to long-time driving and excessive power can be easily repaired.

Further, according to the invention of claim 10 of the present application,
If the voice coil bobbin ignites, it is possible to prevent the suspension and the diaphragm from burning and prevent the speaker from burning.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a voice coil unit of a speaker in a first embodiment of the invention.

FIG. 2 is an explanatory diagram of materials forming a voice coil unit of the speaker of the first embodiment.

FIG. 3 is a half sectional view showing a structure of a speaker in a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of materials forming a voice coil unit of a speaker of a second embodiment.

FIG. 5A is a half sectional view showing a structure of a speaker in a third embodiment of the present invention, and FIG. 5B is a sectional view showing a structure of a dust cap thereof.

FIG. 6A is a perspective view showing a configuration of a voice coil portion of a speaker of a fourth embodiment of the present invention, and FIG. 6B is a half sectional view thereof.

FIG. 7 is a perspective view showing the configuration of an annular magnetic circuit unit in the speaker of the fourth embodiment.

FIG. 8 is a perspective view showing a configuration of a voice coil unit of a speaker according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view showing a configuration of a voice coil unit of a speaker of a fifth embodiment.

FIG. 10 is a half cross-sectional view showing the structure of a speaker according to a sixth embodiment of the present invention.

FIG. 11 is a perspective view showing a structure of a top plate in the speaker of the sixth embodiment.

FIG. 12 is a perspective view showing the structure of a hollow member in the speaker of the sixth embodiment.

FIG. 13 is a perspective view showing a configuration of a voice coil unit in the speaker of the seventh embodiment of the present invention.

FIG. 14 is a perspective view showing a configuration of a voice coil section in a speaker of an eighth embodiment of the present invention.

FIG. 15 is a half cross-sectional view showing the structure of a speaker according to a ninth embodiment of the present invention.

FIG. 16 is a half cross-sectional view showing a structural example of a conventional speaker.

[Explanation of symbols]

2 frame 3 center pole 4 magnet 5,73 top plate 6 annular magnetic circuit 7 air gap 9 coil 11 diaphragm 12 suspension 13 edge 20, 30, 40, 50, 60, 70, 80, 90, 1
00 speaker 21, 31, 41, 51, 61, 71, 81, 91, 1
01 Voice coil unit 22, 32, 42, 52, 62, 72, 82, 92, 1
02 voice coil bon 23,33 composite member sheet 23a, 23b surface material 23c core material 24 fine wire material 43 dust cap 43a pleats 53 cooling member 53a recessed portion 53b projection portion 54 cutout portion 63 linear projection portion 73a through hole 74 hollow member 74a ventilation hole 74b Slit 74c Communication hole 75 Pipe 82a, 92a Upper end part 83, 93 Terminal 84 Overcurrent protection element 94 Thermal fuse 103a, 103b Adhesive layer

Claims (10)

[Claims] 1. A vibrating plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, and In a speaker having a center pole inserted inside a voice coil bobbin, the voice coil bobbin is a sheet-like core material in which fine metal wires covered with an insulating material are arranged in parallel, and the voice coil bobbin is adhered to both surfaces of the core material. A composite member sheet having a surface material composed of a glass fiber reinforced plastic sheet, and integrally forming the core material and the surface material, wherein the coil is a coil of the voice coil bobbin. A speaker characterized in that a conductor is fixedly wound around the outer peripheral surface in a single layer or in multiple layers. 2. A vibrating plate for giving air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, and In a speaker having a center pole inserted inside a voice coil bobbin, the voice coil bobbin is a sheet-like core material in which fine metal wires covered with an insulating material are arranged in parallel, and the voice coil bobbin is adhered to both surfaces of the core material. A composite member sheet having a surface material composed of a glass fiber reinforced plastic sheet, and integrally bonding the surface material to a part of the core material, wherein the coil is formed. It is characterized in that a conductor is wound and fixed in a single layer or multiple layers on the exposed portion of the core member on the outer peripheral surface of the voice coil bobbin. Speaker to be. 3. A diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a dust cap covering an end surface of the voice coil bobbin, a coil wound around the voice coil bobbin, and an outer periphery of the voice coil bobbin. In a speaker having an annular top plate located in a central portion and a center pole inserted into the voice coil bobbin, the voice coil bobbin is a sheet-shaped core material in which fine metal wires coated with an insulating material are arranged in parallel. And a surface material composed of a glass fiber reinforced plastic sheet adhered to both sides of the core material, and a cylindrical composite member sheet in which the surface material is integrally bonded to a part of the core material. The coil is formed on a portion of the outer peripheral surface of the lower end of the voice coil bobbin where the core material is exposed. A single conductor or multiple layers of wire-bonded conductors, and the dust cap has a substantially spherical shell shape attached with the exposed portion of the core member of the upper end outer peripheral surface of the voice coil bobbin as a joint surface. A speaker characterized by being a thing. 4. The speaker according to claim 3, wherein the dust cap has a fold for heat dissipation provided on a substantially spherical shell surface. 5. A vibrating plate for giving air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, and In a speaker having a center pole inserted into a voice coil bobbin, a protrusion having a plurality of cooling fins formed integrally with the recess and the recess for contacting the outer circumference of the coil and for releasing heat conducted from the coil. And a cooling member that is in close contact with the winding outer peripheral surface of the coil and the outer peripheral surface of the voice coil bobbin, wherein the top plate has a cutout portion that provides a space for vibrating the cooling member. A speaker characterized by being provided in an inner peripheral portion. 6. A vibrating plate for giving air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, In a speaker having a center pole inserted into a voice coil bobbin, the voice coil bobbin has a linear protrusion formed in a spiral shape on a part of an outer peripheral portion of the voice coil bobbin, and the coil is A speaker characterized in that a conductor is fixedly wound in a single layer or a plurality of layers on an outer peripheral surface of the voice coil bobbin in which the linear protrusion is not formed. 7. A vibrating plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, and A speaker having a center pole inserted into a voice coil bobbin, wherein the top plate has a plurality of thin-tube through-holes radially extending from an outer peripheral surface to an inner peripheral surface formed inside an annular magnetic band. The speaker is characterized in that an annular hollow member having an annular slit communicating with the through hole and a ventilation hole for supplying air to the slit is provided on an outer peripheral portion of the top plate. 8. A vibrating plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, and In a speaker having a center pole inserted inside a voice coil bobbin, an overcurrent protection element having a resistance value larger than that of a conductor portion of the coil is provided in series with the coil on an outer peripheral portion of the voice coil bobbin through a terminal. Speaker. 9. A vibrating plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, a coil wound around the voice coil bobbin, an annular top plate located on an outer peripheral portion of the voice coil bobbin, A speaker having a center pole inserted inside a voice coil bobbin, wherein a temperature fuse, which is blown by a temperature rise through a terminal, is provided in a peripheral portion of the voice coil bobbin in series with the coil. 10. A diaphragm for giving air vibration, a cylindrical voice coil bobbin joined to the diaphragm, a suspension for vibratingly holding the voice coil bobbin, a coil wound around the voice coil bobbin, and a voice coil bobbin. In a speaker having an annular top plate located on an outer peripheral portion and a center pole inserted inside the voice coil bobbin, the voice coil bobbin, the diaphragm, and the suspension are bonded by using an adhesive layer having a self-extinguishing property. A speaker characterized by being provided.