JP2001268690A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem caused by the fact that a speaker which is made thin by providing a yoke with slits radially and incorporating a coupling member including a support piece coupling a voice coil and a diaphragm with the slits is disadvantageous when mass-produced since the coupling member is fixed and then needs to have a shape conforming with the external diameter varying with the wire diameter of the voice coil. SOLUTION: The support piece is formed obliquely from the inner periphery to the outer periphery and then the coupling member including the support piece is fixed to a voice coil bobbin to eliminate the need to vary the shape of the coupling member in spite of variation in the shape of the voice coil with the change of the wire diameter of the voice coil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin speaker capable of reducing the overall height.

[0002]

2. Description of the Related Art A speaker having a structure in which a yoke is provided with a slit, a support piece is inserted into the yoke, and the voice coil and the diaphragm are connected by the support piece is disclosed in Japanese Patent Laid-Open No. 55-64500.

FIG. 14 is a structural sectional view of a speaker disclosed in Japanese Patent Application Laid-Open No. 55-64500, and FIG. 15 is a top view of a magnetic circuit peripheral portion.

[0004] 1 is a magnet, 2 is a center pole, 3
Is a yoke, and these constitute a magnetic circuit. 4 is a magnetic gap, 5 is a support piece, 6 is a ring to which the support piece is fixed, 7 is a coupling member composed of the support piece and the ring, 8 is a diaphragm attached to the outer peripheral portion of the coupling member, and 9 is a coupling member. A voice coil attached to the peripheral portion, 10 is a damper, 11 is a slit provided on the yoke 3 into which the support piece 5 is inserted, 1
2 is a frame.

In the above configuration, when an electric input is applied to the voice coil 9, a vertical driving force is generated in the voice coil 9 by the magnetic gap 4. Since the diaphragm 8 is joined to the voice coil 9 via the support piece 5 by the coupling member 7, the driving force generated in the voice coil 9 is transmitted and vibrates to generate sound. At this time, since there is no fear that the diaphragm 8 hits the yoke upper surface 3a, there is no need to design the overall height in consideration of the amplitude margin, and the overall height h can be reduced.

FIG. 16 shows a single long metal foil shown in Japanese Patent Laid-Open No. 55-64500, which is bent at regular intervals.
FIG. 11 is a top view of a state in which a support piece is formed by overlapping the bent portions and a metal foil is formed in a cylindrical shape to simultaneously form a voice coil bobbin.

[0007]

However, in such a loudspeaker, a coupling member must be attached to the outside of the voice coil. Therefore, when changing the wire diameter of the voice coil in order to change the driving force, the outside of the voice coil must be fixed. Whenever the diameter is changed, it is necessary to change the inner diameter of the coupling member. Alternatively, if the inner diameter of the coupling member is fixed, it is necessary to change the inner diameter of the voice coil. Therefore, one coupling member is required for one voice coil, so that the cost of parts increases in mass production and the management of parts takes time.

Further, in consideration of mass productivity, when the thin metal foil is bent as shown in FIG. 16 to form the supporting piece and the connecting member also as the voice coil bobbin, the bonding between the supporting piece and the diaphragm and the damper is performed. The area becomes extremely small, the adhesive strength is reduced, and there is a possibility that peeling occurs when the amplitude is large, the driving force generated in the voice coil is not transmitted to the diaphragm, and the sound pressure characteristic of the speaker is adversely affected.

[0009]

In order to solve the above-mentioned problems, a speaker according to the present invention has a magnet fixed to an upper surface of a bottom plate and a center pole fixed to the magnet or the upper surface of the bottom plate. And a yoke provided with radial slits, a magnetic circuit forming an air gap serving as a magnetic gap between the center pole and the yoke, and a voice wound around a voice coil bobbin inserted into the magnetic gap. A coil, a diaphragm and a damper located on the outer periphery of the magnetic circuit, and a plurality of coils fixed to the outer periphery of the voice coil bobbin, inserted into the slit, and formed obliquely toward the outer periphery of the magnetic circuit. A support piece is provided, and at least one of the diaphragm and the damper is fixed to the outer periphery of the support piece.

Alternatively, a magnet fixed to the upper surface of the bottom plate, a center pole fixed to the upper surface of the magnet or the bottom plate, and a yoke provided with radial slits are provided. Between the yoke, a magnetic circuit forming an air gap serving as a magnetic gap, a voice coil wound around a voice coil bobbin inserted into the magnetic gap, a diaphragm and a damper located on the outer periphery of the magnetic circuit, The voice coil bobbin includes a plate-shaped coupling member fixed to the outer periphery of the voice coil bobbin, a part of which is formed in a convex shape toward the outer periphery, and the projection of the coupling member is inserted into the slit or the slit is formed. And a structure in which the inner periphery of at least one of the diaphragm and the damper is fixed to the outer periphery of the projection.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. The same components as those of the conventional speaker shown in FIGS. 14 to 16 are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) FIG. 1 is a top view showing the vicinity of a magnetic circuit of a speaker according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view of the entire speaker according to the first embodiment taken along the line AOB of FIG.

FIG. 3, FIG. 4, and FIG. 5 are perspective views showing another shape of the connecting member having the support piece therein according to the first embodiment.

FIG. 6 is a sectional view showing another method of fixing the voice coil and the coupling member in the first embodiment.

Reference numeral 5a denotes a support piece that is lowered obliquely downward from the inner circumference toward the outer circumference, 6a denotes a ring, 7a denotes a support piece fixed to the ring, and a connecting member (hereinafter, referred to as a connecting member) that connects the diaphragm and the voice coil. Reference numeral 13 denotes a voice coil bobbin fixed to the inner periphery of the coupling member. The voice coil 9 is wound below the voice coil bobbin 13. Voice coil 9 is inserted in magnetic gap 4.

With the above configuration, a magnetic flux density is generated in the magnetic gap 4 by the magnet 1, the yoke 3 having radial slits, the center pole 2, and the bottom plate 14. When an electric input is applied to the voice coil 9, a driving force is generated in the voice coil 9 according to Fleming's left-hand rule, and the voice coil 9 vibrates up and down. Since the voice coil 9 is coupled to the diaphragm 8 via the voice coil bobbin 13 and the coupling member 7a, the diaphragm also vibrates vertically. At this time, since the diaphragm 8 does not hit the yoke upper surface 3a, there is no need to consider an amplitude margin between the diaphragm and the yoke upper surface, and the overall height of the speaker can be designed low.

Further, even if the outer diameter of the voice coil is changed by changing the wire diameter of the voice coil 9, the outer diameter of the voice coil bobbin is not affected. There is no need to change the inner diameter. Therefore, various kinds of voice coils whose wire diameters are changed in order to change the driving force can be handled by one kind of coupling member, so that the cost can be reduced at the time of mass production and the parts can be easily managed.

Although FIG. 2 shows the yoke and the plate as separate components, they may be integrally formed.

FIG. 2 shows an inner magnet type magnetic circuit in which the magnet is inside the yoke. As shown in FIG. 7, the magnet is provided on the outer periphery of the center pole, and slits are provided on both the magnet and the yoke. An external magnet type magnetic circuit may be configured.

Further, as shown in FIG. 3, the support member 5b may be fixed to the outer periphery of one ring 6c to form the coupling member 7b.

Further, as shown in FIG. 4, one ring 6d
The supporting member 5c may be fixed to the inner periphery of the member to form the coupling member 7c.

As shown in FIG. 5, the ring may be omitted and the connecting member 7d may be formed only by the supporting piece 5d.

In the above case, the weight of the vibration system is reduced and the efficiency of the speaker is improved as compared with the structure having the double ring shown in FIG. Further, in the structure having the double ring shown in FIG. 1, if a mold is used at the time of manufacturing the metal or resin, it may be difficult for the metal or resin to flow or may not be pressed. 4 and 5 are relatively easy to mold, which is advantageous during mass production.

In FIG. 2, the voice coil is fixed to the inner periphery of the ring 6a via a voice coil bobbin. However, as shown in FIG. 6, the voice coil bobbin is omitted and an annular member is fixed to the upper surface of the voice coil. May be. In this case, the vibration system is reduced and the magnetic gap can be narrowed, so that the efficiency of the speaker is improved.

Further, as shown in FIG. 8, the magnetic circuit is formed into a polygonal shape, and rings 6g and 6f
Even if f and the coupling member 7f are formed, the same effect can be obtained, and an arbitrary shape that can be easily manufactured can be selected.

(Embodiment 2) FIG. 9 is a top view of a part around a magnetic circuit of a loudspeaker according to Embodiment 2 of the present invention. FIG. It is AOB sectional drawing. FIG. 11 is a perspective view of a single formed thin plate serving as a base of the connecting member.

Reference numeral 7g denotes a connecting member for connecting the diaphragm and the voice coil, which is formed by bending a thin plate-like member into a convex and annular shape, a part of which is inserted into a slit 11 formed in the yoke 3. .

The connecting member is formed by winding a single thin plate formed as shown in FIG. 11 around the outer periphery of the voice coil bobbin 13 or the voice coil 9. A diaphragm 8 and a damper 10 are fixed to the outer peripheral portion.

According to the above configuration, since the connecting member can be formed by bending a single thin plate-like metal or resin, processing is easy and mass productivity is improved. Further, since the bonding area between the diaphragm and the damper is large, the bonding strength is increased, so that the driving force from the voice coil is not transmitted and the voice coil does not peel off when the amplitude is large.

Further, since the width of the slit can be reduced in accordance with the thickness of the coupling member, the volume of the yoke increases, and as a result, the magnetic flux density generated in the magnetic gap increases, and the driving force increases.

In FIG. 9, the number of the outer peripheral portions, which are the connecting portions of the connecting member to the diaphragm and the damper, is four, but is set to an arbitrary number in consideration of the ease of manufacture and the bonding area. It is possible.

FIG. 10 shows the yoke and the plate as separate components, but they may be formed integrally.

Although not shown in the drawing, FIG. 10 shows an internal magnet type magnetic circuit in which the magnet is inside the yoke, whereas the magnet is provided on the outer periphery of the center pole and slits are provided on both the magnet and the yoke. Thus, an external magnet type magnetic circuit may be configured.

Further, as shown in FIG. 13, even if the magnetic circuit is formed into a polygonal shape and is shaped like the coupling member 7i, the same effect can be obtained, and an arbitrary shape which can be easily manufactured can be selected. .

FIG. 12 is a structural sectional view of a speaker in the case where one thin plate formed as shown in FIG. 9 is wound around the outer periphery of the voice coil 8 to form the coupling member 7h. In this case, the voice coil bobbin can be omitted,
The efficiency of the speaker can be improved by reducing the weight of the vibration system, and since the thin plate is directly attached to the voice coil, the cooling effect of the voice coil can be increased and the input resistance of the speaker can be improved.

[0037]

As described above, the loudspeaker of the present invention is provided with a magnet fixed to the upper surface of the bottom plate, a center pole fixed to the magnet or the upper surface of the bottom plate, and a radial slit. A magnetic circuit forming an air gap serving as a magnetic gap between the center pole and the yoke; a voice coil wound around a voice coil bobbin inserted into the magnetic gap; A diaphragm and a damper located on the outer periphery, and a plurality of support pieces fixed to the outer periphery of the voice coil bobbin, inserted into the slits, and formed obliquely toward the outer periphery of the magnetic circuit; By having a structure in which at least one of the diaphragm and the damper is fixed to the outer periphery of the piece, the wire diameter of the voice coil is changed. Since there is no need to change the dimensions of the support piece and the annular member, and one annular member can cope with various types of voice coils, it is practically advantageous to improve mass productivity and ease of parts management. .

Alternatively, a magnet fixed to the upper surface of the bottom plate, a center pole fixed to the magnet or the upper surface of the bottom plate, and a yoke provided with radial slits are provided. Between the yoke, a magnetic circuit forming an air gap serving as a magnetic gap, a voice coil wound around a voice coil bobbin inserted into the magnetic gap, a diaphragm and a damper located on the outer periphery of the magnetic circuit, The voice coil bobbin includes a plate-shaped coupling member fixed to the outer periphery of the voice coil bobbin, a part of which is formed in a convex shape toward the outer periphery, and the projection of the coupling member is inserted into the slit or the slit is formed. On the outer periphery of the convex portion, and has a structure for fixing at least one inner periphery of the diaphragm and the damper, so that the annular member and With molding is easy of the support piece, a large adhesion area between the vibrating plate or damper and the annular member, less prone to breaking due to separation, but practically advantageous.

[Brief description of the drawings]

FIG. 1 is a top view around a magnetic circuit of a speaker according to a first embodiment of the present invention.

FIG. 2 is a structural sectional view of the speaker according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing another shape of the support piece and the coupling member according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing another shape of the support piece and the coupling member according to the first embodiment of the present invention.

FIG. 5 is a perspective view showing a state in which the ring is omitted and the voice coil is connected only by the support pieces in the first embodiment of the present invention.

FIG. 6 is a structural sectional view showing another method of fixing the voice coil and the coupling member in the first embodiment of the present invention.

FIG. 7 is a structural sectional view of a speaker in which a magnetic circuit is an external magnet type according to the first embodiment of the present invention;

FIG. 8 is a top view of a magnetic circuit of another shape according to the first embodiment of the present invention.

FIG. 9 is a top view of a portion around a magnetic circuit of the speaker according to the second embodiment of the present invention.

FIG. 10 is a structural sectional view of a speaker according to a second embodiment of the present invention.

FIG. 11 is a perspective view of a base shape of a coupling member according to the second embodiment of the present invention.

FIG. 12 is a structural sectional view of a speaker having another shape according to the second embodiment of the present invention.

FIG. 13 is a top view of a magnetic circuit of another shape according to the second embodiment of the present invention;

FIG. 14 is a structural sectional view of a speaker in Japanese Patent Application Laid-Open No. 55-64500.

FIG. 15 is a top view around a magnetic circuit of a speaker in Japanese Patent Application Laid-Open No. 55-64500.

FIG. 16 is a top view of a support piece formed by bending a thin metal plate in JP-A-55-64500.

[Explanation of symbols]

Reference Signs List 1 magnet 2 center pole 3 yoke 3a yoke upper surface 4 magnetic gap 5,5a, 5b, 5c, 5d, 5e, 5f, 5g, 5
h, 5i Supporting pieces 6, 6a, 6b, 6c, 6d, 6e, 6f, 6g Ring 7, 7a, 7b, 7c, 7d, 7e, 7f, 7g, 7
h, 7i coupling member 8 diaphragm 9 voice coil 10 damper 11 slit 12 frame 13 voice coil bobbin 14 bottom plate

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Hiroyuki Takewa 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. F term (reference) 5D012 BA06 BB04 BD00 CA03 CA05 CA07 FA00 FA10

Claims (9)

[Claims] 1. A magnet fixed to an upper surface of a bottom plate, a center pole fixed to the magnet or the upper surface of the bottom plate, and a yoke provided with radial slits. Between the yoke, a magnetic circuit forming an air gap serving as a magnetic gap, a voice coil wound around a voice coil bobbin inserted into the magnetic gap, a diaphragm and a damper located on the outer periphery of the magnetic circuit, The voice coil bobbin includes a plurality of support pieces that are fixed to the outer circumference of the voice coil bobbin, are inserted into the slits, and are formed obliquely toward the outer circumference of the magnetic circuit. A speaker having a structure for fixing one side. 2. A magnet fixed to an upper surface of a bottom plate, a center pole fixed to the magnet or an upper surface of the bottom plate, and a yoke provided with radial slits. Between the yoke, a magnetic circuit forming an air gap serving as a magnetic gap, a voice coil inserted into the magnetic gap, a diaphragm and a damper located on the outer periphery of the magnetic circuit, and an outer periphery of the voice coil or An annular ring fixed to the upper surface, fixed to the outer periphery of the annular ring,
A structure in which at least one of the diaphragm and the damper is coupled to the outer periphery thereof, and a plurality of support pieces inserted into the slit, wherein the support piece is formed obliquely from the inside to the outside of the slit. A speaker having: 3. The speaker according to claim 1, wherein an annular ring is provided on an inner periphery of the support piece, and a voice coil bobbin or a voice coil is fixed to the inner periphery or the lower surface of the annular ring. 4. The loudspeaker according to claim 1, wherein an annular ring is provided on an outer periphery of the support piece, and at least one of a diaphragm and a damper is fixed to an outer periphery of the annular ring. 5. An annular ring having two different diameters, wherein a support piece is fixedly sandwiched between the two annular rings, and a voice coil bobbin or a voice coil is provided on one inner periphery or a lower surface of the annular ring. The speaker according to claim 1, further comprising a structure for fixing at least one of a diaphragm and a damper on the other outer periphery of the annular ring. 6. A magnet fixed to an upper surface of a bottom plate, a center pole fixed to the magnet or the upper surface of the bottom plate, and a yoke provided with radial slits. Between the yoke, a magnetic circuit forming an air gap serving as a magnetic gap, a voice coil wound around a voice coil bobbin inserted into the magnetic gap, a diaphragm and a damper located on the outer periphery of the magnetic circuit, The voice coil bobbin includes a plate-shaped coupling member fixed to the outer periphery of the voice coil bobbin, a part of which is formed in a convex shape toward the outer periphery, and the projection of the coupling member is inserted into the slit or the slit is formed. And a structure in which at least one of the inner periphery of the diaphragm and the damper is fixed to the outer periphery of the projection. 7. A magnet fixed to an upper surface of a bottom plate, a center pole fixed to the upper surface of the magnet or the upper surface of the bottom plate, and a yoke provided with radial slits. Between the yoke, a magnetic circuit forming an air gap serving as a magnetic gap, a voice coil inserted into the magnetic gap, a diaphragm and a damper located on the outer periphery of the magnetic circuit, and an outer periphery of the voice coil. Attached, provided with a plate-shaped coupling member formed by forming a part thereof in a convex shape toward the outer peripheral portion, the convex portion of the coupling member is inserted into the slit, or located on the slit, A speaker having a structure in which the inner periphery of at least one of the diaphragm and the damper is fixed to the outer periphery of the projection. 8. A cylindrical yoke formed integrally with the outer periphery of the bottom plate and provided with radial slits,
An inner magnet type including a columnar magnet disposed inside the yoke and on the bottom plate upper surface, and a columnar center pole disposed on the upper surface of the magnet, and having a gap serving as a magnetic gap between the center pole and the yoke. The speaker according to any one of claims 1, 2, 6, and 7, which forms a magnetic circuit. 9. A column-shaped center pole integral with the bottom plate, a cylindrical magnet provided radially with slits on the outer periphery and the upper surface of the bottom plate, and a radial slit. On the top surface, a cylindrical yoke is installed so that the slits overlap,
2. An external magnetic circuit having an air gap serving as a magnetic gap between the yoke and the center pole.
The speaker according to any one of 2, 6, and 7.