JPH0634397U - Speaker - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] To increase the bonding strength between bobbin 8 and cone 9. [Structure] A reinforcing ring 12 is provided on a tip side 8a of a bobbin 8 of a voice coil 7 of a speaker 1, and an outer circumference 1 of the reinforcing ring 12 is provided.
By forming the inclined surface 2a along the surface shape 9b of the cone 9, it is possible to reinforce the bobbin 8 and prevent it from being deformed at the time of a large input. It also prevents bending due to force. Further, since the bobbin 8 and the cone 9 are bonded to each other, the bonding strength between the bobbin 8 and the cone 9 is increased, and a large input can be performed, so that the input resistance is improved. Therefore, it is possible to reproduce faithful and clear sound quality without sound distortion.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a speaker, and more particularly to a speaker having a reinforcing ring attached to a bobbin tip side of a voice coil.

[0002]

[Prior art]

 FIG. 4 is a cross-sectional view of a speaker 21 using a typical conventional technique, and FIG. 5 is a cross-sectional view showing a joined state of a bobbin 28 and a cone 29 of the speaker 21. The magnetic circuit of the speaker 21 is an outer magnet type in which an annular magnet 25 is sandwiched between a pole piece 23 and a plate 24, and a frame 26 is attached to the plate 24. In the magnetic gap formed between the pole piece 23 and the plate 24, the bobbin 28 around which the voice coil 27 is wound is arranged to be supported by the damper 22 attached to the frame 26. Further, the base end portion 29a of the cone 29 is joined to the tip end portion 28a of the bobbin 28 with an adhesive. The outer peripheral edge portion 29c of the cone 29 is connected to the radially inner side 30a of the edge 30 and the radially outer side 30b of the edge 30 is sandwiched and contacted by the frame 26 and the gasket 31.

The gasket 31 is provided with a plurality of insertion holes, and a mounting hole is provided in the lower portion of the insertion hole, and a screw or the like is used in this portion to fix the gasket 31 to a cabinet or the like. Further, the damper 22 is formed by, for example, impregnating cloth with phenol, resin, or the like, and performing heat molding. Further, a corrugation is formed in the damper 31 concentrically with the bobbin 28, so that the braking effect of the cone 29 is obtained.

In the speaker 21, when a driving current is sent, an axial driving force is induced based on an electromagnetic action between the magnetic gap and the voice coil 27. This force is transmitted to the cone 29, which is a diaphragm, via the bobbin 28. The cone 29 vibrates back and forth under the action of this driving force, and emits a sound wave toward the front space.

In the speaker 21 as described above, when the driving force is transmitted from the bobbin 28 to the cone 29, if a large input is made, the driving force in the front-rear direction becomes large and the bobbin 28 may be deformed. A reinforcement ring 52 made of aluminum or the like is attached to the tip side of the bobbin 48 by adhering it to prevent deformation by reinforcing the bobbin 48. A cross-sectional view of the speaker 41 is shown in FIG.

[0006]

[Problems to be solved by the device]

 In the conventional technique, although the bobbin 48 can be reinforced by using the reinforcing ring 52, the cone 49 is not taken into consideration, and when a large driving force is generated, a large force is applied to the base end portion 49a of the cone 49. Therefore, there is a problem that the cone 49 bends due to the addition of the strain and the strain is generated. Further, if the bobbin 48 and the cone 49 are not well adhered to each other, the joint may be damaged. In addition, sound quality is distorted, and good sound reproduction cannot be performed.

Further, the joint strength between the bobbin 48 and the cone 49 is one of the factors that determine the load resistance. If the joint strength is insufficient, input resistance will not be improved and it will be difficult to achieve high fidelity sound reproduction.

An object of the present invention is to provide a speaker which can prevent the deformation of the bobbin and the deflection of the cone diaphragm and can increase the bonding strength between the bobbin and the cone diaphragm.

[0009]

[Means for Solving the Problems]

 The present invention is a speaker in which a reinforcing ring is mounted on the tip side of a bobbin of a voice coil, wherein the outer periphery of the reinforcing ring is formed as an inclined surface along the surface shape of the cone diaphragm.

[0010]

When the reinforcing ring is attached to the bobbin tip side of the voice coil of the speaker, the outer periphery of the reinforcing ring is formed as an inclined surface that follows the surface shape of the cone diaphragm. By adhering the cone diaphragm to the outer circumference of the reinforcing ring, not only can the bobbin be reinforced to prevent deformation, but the cone diaphragm can also be reinforced to prevent bending. Further, the bonding strength between the bobbin and the cone diaphragm can be increased to prevent the joint surface from being broken, and the load resistance can be improved.

[0011]

【Example】

 1 is a sectional view of a speaker 1 according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of a reinforcing ring 12 portion of the speaker 1, and FIG. 3 is an inside of a bobbin 8 of a reinforcing ring 12 of FIG. It is sectional drawing of the part except. The magnetic circuit of the speaker 1 is an outer magnet type in which an annular permanent magnet 5 is sandwiched between a pole piece 3 and a plate 4, and a metal frame 6 is attached to the plate 4. The magnetic flux generated from the permanent magnet 5 is concentrated in the magnetic gap between the pole piece 3 and the plate 4, and the bobbin 8 around which the voice coil 7 is wound is supported by the damper 2 attached to the frame 6. Will be placed. The bobbin 8 is a material having heat resistance. The base end 9a of the cone 9 is bonded to the outer peripheral side 8b of the tip of the bobbin 8 with an adhesive, and the aluminum reinforcing ring 12 is bonded to the inner peripheral side 8c. The outer circumference 12a of the reinforcing ring 12 is formed along the surface shape 9b of the cone 9 and is bonded to the inclined surface of the cone 9. A portion of the edge 10 on the radially outer side 10b is sandwiched and joined by the frame 6 and a cardboard gasket 11. The edge 10 may be made of a material different from that of the cone 9, for example, urethane foam resin, and may be bonded to the cone 9.

The gasket 11 is provided with a plurality of insertion holes, and an attachment hole is provided in the lower part of the insertion hole, and a screw or the like is used in this portion to fix the gasket 11 to a cabinet or the like. Further, the damper 2 is formed by, for example, impregnating cloth with phenol, resin, or the like, and performing heat molding. Further, a corrugation is formed on the damper 2 concentrically with the bobbin 8, and holds the bobbin 8 so as to be displaceable in the axial direction. The damper 2 and the edge 10 have a moderate internal loss and obtain the braking effect of the cone 9.

In the speaker 1, when driving power is sent, an axial driving force is induced based on an electromagnetic interaction between a magnetic flux generated in the magnetic gap and a current flowing in the voice coil 7. This force is transmitted via the bobbin 8 to the cone 9 which is a diaphragm. The cone 9 vibrates back and forth in the axial direction under the action of this driving force, and emits a sound wave toward the front space. In the present invention, the reinforcing ring 12 for reinforcing the bobbin 8 is joined not only to the bobbin 8 but also to the cone 9, so as to prevent the bobbin 8 from being deformed and suppress the deflection of the cone 9, It also increases the bonding strength between 8 and cone 9. Therefore, it is possible to improve input resistance and realize high fidelity acoustic reproduction.

Although the reinforcing ring 12 is made of aluminum in the present embodiment, it is needless to say that a lightweight and high-strength material such as another metal or alloy, or a synthetic resin may be used.

[0015]

[Effect of device]

 As described above, according to the present invention, since the reinforcing ring is attached so as to be joined to both the bobbin and the cone, the joining strength between the bobbin and the cone is increased. Since this joint strength is one of the factors that improve the withstand input, the increase in the joint strength improves the limit of the allowable input of the speaker.

Therefore, since the driving force at the time of a large input from the bobbin to the cone can be sufficiently transmitted and the cone does not bend, input resistance is improved, and clear sound is reproduced without distortion in sound quality.

[Brief description of drawings]

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

FIG. 2 is an enlarged cross-sectional view in the vicinity of a reinforcing ring 12 of the speaker 1.

FIG. 3 is a cross-sectional view of a portion of the reinforcing ring 12 of the speaker 1 excluding the inner portion of the bobbin 8.

FIG. 4 is a sectional view of a conventional speaker 21.

FIG. 5 is an enlarged cross-sectional view of the reinforcement ring 32 and its vicinity of the speaker 21.

FIG. 6 is a cross-sectional view of another conventional speaker 41.

[Explanation of symbols]

 1 speaker 7 voice coil 8 bobbin 9 cone 12 reinforcement ring

Claims (1)

[Scope of utility model registration request] 1. A speaker in which a reinforcing ring is attached to a bobbin tip side of a voice coil, wherein the outer periphery of the reinforcing ring is formed as an inclined surface along the surface shape of a cone diaphragm.