JP2001292494A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a conventional speaker that has had much difficulty in manufacturing of a support piece resulting in causing disadvantages in the mass-productivity and the cost in the conventional speaker where slits are formed to a yoke and the support piece is interior-mounted to join a diaphragm and a voice coil to attain low-profile and that has increased the weight of a vibration system due to the weight of the support piece resulting in deteriorating the efficiency. SOLUTION: The speaker of this invention adopts a structure such that the shape of the voice coil is formed to be joined with the diaphragm so as to omit a conventional support piece.

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 slit is provided in a yoke, a supporting piece is inserted into the yoke, and a voice coil and a diaphragm are connected by the supporting piece to keep the overall height low is disclosed in Japanese Patent Application Laid-Open No. 55-55.
-64500.

FIG. 13 is a structural sectional view of a loudspeaker disclosed in Japanese Patent Application Laid-Open No. 55-64500, and FIG. 14 is a top view of a peripheral portion of a magnetic circuit.

[0004] 1 is a magnet, 2 is a center pole, 3
Is a yoke provided with radial slits, and these constitute a magnetic circuit 18. 17 is a yoke upper surface, 4 is a magnetic gap, 5 is a support piece, 6 is a coupling member provided with a support piece, 7 is a diaphragm attached to the outer periphery of the coupling member, and 8 is a voice coil attached to the inner periphery of the coupling member. , 9 are dampers, 10 is a slit provided in the yoke 3 and the support piece 5 is inserted, 11 is a frame, and 12 is a bottom plate.

In the above configuration, when an electric input is applied to the voice coil 8, a vertical driving force is generated in the voice coil 8 by the magnetic gap 4. Since the diaphragm 7 is joined to the voice coil 8 via the support piece 5 by the coupling member 6, the driving force generated in the voice coil 8 is transmitted, and vibrates to generate sound. Further, the diaphragm 7 is located on the upper surface 1 of the yoke.
7, there is no need to design the overall height in consideration of the margin of the amplitude, and the overall height h can be reduced.

[0006]

However, such a loudspeaker requires a connecting member for mounting the supporting piece, which increases the number of parts and costs, increases the number of manufacturing steps, and makes it difficult to manage the parts. It is disadvantageous for mass production.

In addition, the weight of the vibration system is increased by the coupling member, which hinders improvement in the efficiency of the speaker.

[0008] Furthermore, the joining member having the support piece therein is very difficult to press or flow due to its complicated shape, and is inferior in mass productivity.

[0009]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises a magnetic circuit, a diaphragm located on the outer periphery of the magnetic circuit, and an outer periphery of the magnetic circuit and below the diaphragm. And a voice that is inserted into the magnetic circuit and has a shape that is fixed to at least one of the diaphragm or the damper outside the magnetic circuit and at least one location in the horizontal direction with respect to the center axis of the magnetic circuit. And a coil.

Further, the magnetic circuit includes a bottom plate,
A magnet fixed to the top surface of the bottom plate, a center pole fixed to the top surface of the magnet, and a yoke fixed to the top surface and the outer periphery of the bottom plate; And the magnetic circuit further has a gap serving as a slit between the divided yokes, and a gap serving as a magnetic gap between the center pole and the yoke, and the voice coil includes: It is configured to be inserted into the magnetic gap and the slit.

Further, the magnetic circuit includes a bottom plate,
A center pole fixed to an upper surface of the bottom plate, a magnet fixed to an upper surface of the bottom plate along an outer periphery of the center pole, and a yoke fixed to an upper surface of the magnet; The yoke is divided into two or more, the magnet of the magnetic circuit is divided corresponding to the yoke, and the magnetic circuit further includes a gap serving as a slit between the divided yokes, and a center pole. And a gap serving as a magnetic gap between the yoke and the voice coil,
It is configured to be inserted into the magnetic gap and the slit.

[0012] The yoke may be divided according to the shape of the voice coil.

[0013] The voice coil may include at least one of the diaphragm or the damper outside the magnetic circuit and at least one portion in a horizontal direction with respect to a center axis of the magnetic circuit in accordance with the divided yoke. It is configured to be fixed.

Further, the center pole has an extension inserted into the slit between the divided yokes, and the magnetic circuit is provided between the extension of the center pole and the divided yoke. Has a magnetic gap in the gap.

Further, the voice coil is formed in a polygonal shape when viewed from the upper surface of the speaker, and each vertex of the voice coil is fixed to at least one of the diaphragm or the damper.

[0016] Further, a ring is fixed to the outer periphery of the voice coil, and the ring is fixed to at least one of the diaphragm and the damper.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 13 and FIG.
4, the same components as those of the conventional speaker shown in FIG.

(Embodiment 1) FIG. 1 is a top view of a part around a magnetic circuit of a speaker according to Embodiment 1 of the present invention.
Is A- in FIG. 1 of the entire speaker according to the first embodiment.
FIG. 3 shows an OB cross-sectional view.

The magnetic circuit 18 includes a bottom plate 12, a magnet 1 fixed to the upper surface of the bottom plate 12, and a center pole 2 fixed to the upper surface of the magnet 1. And a yoke 3 a fixed to the outer periphery on the upper surface of the bottom plate 12.

Reference numeral 10a denotes a slit serving as a gap between the divided yokes 3a. The magnetic circuit 18 further has a slit 10a and a gap serving as a magnetic gap 4 between the center pole 2 and the yoke 3a.

Reference numeral 8a denotes a voice coil formed so that a part thereof is inserted into the slit 10a and the magnetic gap 4 and the other part is located outside the magnetic circuit 18. 13
Denotes a portion that joins the voice coil 8a and at least one of the diaphragm 7 and the damper 9 (hereinafter, referred to as a "vibration system joining portion"). The vibration system joining portion 13 has a certain width a.

According to the above configuration, the magnet 1, the divided yoke 3a, the center pole 2, the bottom plate 12
As a result, a magnetic flux density is generated in the magnetic gap 4. When an electric input is applied to the voice coil 8a, a driving force is generated in a portion of the voice coil 8a inserted into the magnetic gap 4 and vibrates up and down according to Fleming's left-hand rule.
Since the vibrating plate 7 is fixed to the voice coil 8a at the vibrating system joint portion 13, the vibrating plate 7 also vertically oscillates. At this time, since the diaphragm 7 does not hit the upper surface 17 of the yoke, there is no need to worry about an amplitude margin between the diaphragm 7 and the magnetic circuit 18.

Further, since the supporting piece and the connecting member which are formed as separate parts in the prior art shown in FIG. 13 can be omitted, manufacturability can be improved, cost can be reduced, and the weight of the vibration system can be reduced. Therefore, the efficiency of the speaker is improved.

Further, since the vibration system joining portion 13 has a width a to increase the bonding area with the diaphragm 7 or the damper 9, the vibration plate 7 or the damper 9 can be separated from the voice coil 8a. It can also be suppressed.

Further, since the voice coil 8a is directly coupled to the diaphragm 7, if the diaphragm 7 is made of a material having high thermal conductivity such as aluminum, the heat generated in the voice coil 8a can be directly radiated. Thus, the input resistance of the speaker is improved.

The yoke 3a is divided by the voice coil 8
It may be performed according to the shape of a.

The voice coil 8a may be formed according to the divided yoke 3a.

Although FIG. 2 shows the yoke 3a and the bottom plate 12 as separate components, they may be integrally formed.

FIG. 2 shows an inner-magnet type magnetic circuit in which the magnet 1 is attached to the lower part of the center pole 2. As shown in FIG. 3, the inner magnetic circuit is fixed to the bottom plate 12 and the upper part of the bottom plate 12. An external magnet provided with a center pole 2, a magnet 1 fixed to the upper surface of the bottom plate 12 along the outer periphery of the center pole 2, and a yoke 3a fixed to the upper surface of the magnet 1, and provided with slits like the yoke 3a It may be a type magnetic circuit.

(Embodiment 2) FIG. 4 is a top view showing the periphery of a magnetic circuit according to Embodiment 2 of the present invention. The same components as those in FIGS. 1 to 3 showing the first embodiment of the present invention are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 2a denotes a center pole obtained by radially extending a portion located in the slit 10, and reference numeral 14 denotes an extended portion thereof (hereinafter, referred to as a "center pole extension portion").
15 is through the center pole extension part and the slit 10,
This is a gap (hereinafter simply referred to as a “gap”) provided between the divided yoke 3a.

According to the above configuration, the magnetic flux density is generated in the gap 15 as in the magnetic gap 4, and the sum of the magnetic flux densities penetrating the voice coil 8a is increased, so that the efficiency of the speaker is improved.

Although not shown in the drawing, the yoke 3a
An external magnet type magnetic circuit in which the divided magnets 1 are provided below the center pole 2a, or the lower part of the center pole 2a has the same shape as the center pole 2a or does not overlap the lower part of the center pole extension portion 14. The same effect can be obtained even if an inner magnet type magnetic circuit in which the shaped magnet 1 is installed is configured.

(Embodiment 3) FIG. 5 is a top view showing the periphery of a magnetic circuit according to Embodiment 3 of the present invention.

FIGS. 6 to 8 are top views showing the periphery of the magnetic circuit according to the third embodiment of the present invention.

Reference numeral 8b denotes a voice coil formed in a polygonal shape, and 3b denotes a divided yoke.
Each side is inserted into the magnetic gap 4, the corner of the outer peripheral portion passes between the divided yokes 3b, is guided to the outer peripheral portion of the magnetic circuit, and is joined to at least one of the diaphragm 7 and the damper 9.

With the above-described structure, the support piece and the connecting member, which are formed as separate components in the conventional technique shown in FIG. 13, can be omitted, so that the manufacturability can be improved and the cost can be reduced. Further, since the weight of the vibration system is reduced, the efficiency of the speaker is improved.

Further, when the diaphragm is made of a material having high thermal conductivity such as aluminum, the heat generated in the voice coil can be directly radiated, thereby improving the input resistance.

The above is the same effect as in the first embodiment.

Further, the shape of the voice coil 8b is shown in FIG.
Is a square, but if it is a polygon, the diaphragm can be fixed to the corners of the outer periphery. Therefore, as shown in FIG. 6, the voice coil 8c has a star shape, and the shape is like a divided yoke 3c. 7 or a magnetic circuit having a triangular voice coil 8d as shown in FIG. 7 and having a shape like a divided yoke 3d. Any shape can be adopted in consideration of ease.

As shown in FIG. 8, the center pole 2 which is circular in FIG. 5 is extended to form a star-shaped center pole such as 2c, and a magnetic field is formed between the center pole 2c and the yoke 3c. A gap 4 may be provided.

The yoke may be divided according to the shape of the polygonal voice coil.

The voice coil may be formed in a polygonal shape according to the divided yokes.

Although not shown in the drawing, the magnetic circuit 18 for inserting the voice coil formed in a polygonal shape as described above may be constituted by an internal magnet type magnetic circuit as described in the first embodiment. Alternatively, it may be constituted by an external magnetic circuit.

(Embodiment 4) FIG. 9 is a top view showing the periphery of a magnetic circuit according to Embodiment 4 of the present invention. FIG. 10 shows the entire speaker according to the fourth embodiment,
FIG. 3 shows an OB cross-sectional view.

FIGS. 11 and 12 show a fourth embodiment of the present invention.
FIG. 4 is a top view of the vicinity of the magnetic circuit showing the above.

2b is a polygonal center pole, 8b is a polygonally shaped voice coil, 3b is a yoke divided into two or more parts, and the voice coil 8b has each side inserted into the magnetic gap 4 and has an outer periphery. The corner of the portion passes between the divided yokes 3b and is guided to the outer peripheral portion of the magnetic circuit. Reference numeral 16 denotes a ring for joining the voice coil 8b to at least one of the diaphragm 7 and the damper 9, the inner peripheral portion of which is fixed to the corner of the outer peripheral portion of the voice coil, and the outer peripheral portion of which has the diaphragm 7 or the damper 9. At least one of the inner peripheral portions 9 is fixed.

With the above configuration, the ring 16 enables the voice coil 8b and either the diaphragm 7 or the damper 9 to be fixed, so that the coupling between the voice coil and the vibration system is reinforced.

Further, in the conventional technique shown in FIG. 13, the supporting piece and the connecting member which are formed as separate parts can be omitted, so that the manufacturability is improved and the cost can be reduced.
Further, since the weight of the vibration system is reduced, the efficiency of the speaker is improved.

Further, when the diaphragm is made of a material having high thermal conductivity such as aluminum, the heat generated in the voice coil can be directly radiated, thereby improving the input resistance.

The ring 16 for connecting the voice coil with the diaphragm and the damper may be formed integrally with the diaphragm.

The ring 16 for connecting the voice coil, the diaphragm and the damper can be omitted if the bonding strength of the connection can be obtained. Further, the number of parts can be reduced, and the weight of the vibration system can be reduced. Because of the reduction, the efficiency of the speaker can be improved.

Further, the shape of the voice coil 8b is shown in FIG.
Is a square, but if it is a polygon, the ring 16 can be fixed to the corner of the outer periphery thereof. Therefore, as shown in FIG.
c, a magnetic circuit having a shape like a divided yoke 3c, and a triangular voice coil 8d as shown in FIG.
A magnetic circuit having a shape such as the center pole 2d and the divided yoke 3d may be used, and an arbitrary shape can be adopted in consideration of the magnetic flux density of the magnetic gap and the ease of manufacturing the magnetic circuit and the voice coil.

The yoke 3a may be divided according to the shape of the polygonal voice coil 8b.

The voice coil 8b may be formed in a polygonal shape according to the divided yoke 3a.

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

Although not shown in the figure, FIG. 10 shows an inner magnet type magnetic circuit in which a magnet is arranged below the center pole, whereas a magnet is divided and arranged below the divided yoke. May be configured.

[0058]

As described above, according to the speaker of the present invention, by forming a voice coil having a shape that can be directly joined to a diaphragm or a damper, the connection for mounting the support piece without impairing the overall height is achieved. Since the members can be omitted, the number of parts can be reduced, the cost and the manufacturability can be improved, and the weight of the vibration system can be reduced to improve the efficiency of the speaker. Further, since the voice coil is directly coupled to the diaphragm, the heat radiation effect of the voice coil is increased, and the input resistance of the speaker is improved, which is practically superior.

[Brief description of the drawings]

FIG. 1 is a top view of a peripheral portion of a magnetic circuit 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 structural sectional view of a speaker that is an external-magnet type magnetic circuit according to the first embodiment of the present invention;

FIG. 4 is a top view of a peripheral portion of a magnetic circuit according to a second embodiment of the present invention.

FIG. 5 is a top view of a peripheral portion of a magnetic circuit having another shape according to the third embodiment of the present invention.

FIG. 6 is a top view of a peripheral portion of a magnetic circuit of another shape according to the third embodiment of the present invention.

FIG. 7 is a top view of a peripheral portion of a magnetic circuit of another shape according to the third embodiment of the present invention.

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

FIG. 9 is a top view of a peripheral portion of a magnetic circuit according to a fourth embodiment of the present invention.

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

FIG. 11 is a top view of the periphery of a magnetic circuit of another shape according to the fourth embodiment of the present invention.

FIG. 12 is a top view of a peripheral portion of a magnetic circuit of another shape according to the fourth embodiment of the present invention.

FIG. 13 is a structural sectional view of a speaker according to a conventional technique.

FIG. 14 is a top view of a peripheral portion of a magnetic circuit in a speaker according to the related art.

[Explanation of symbols]

Reference Signs List 1 magnet 2, 2a, 2b, 2c, 2d center pole 3 yoke 3a, 3b, 3c, 3d divided yoke 4 magnetic gap 5 support piece 6 coupling member 7 diaphragm 8, 8a, 8b, 8c, 8d voice coil 9 Damper 10, 10a Slit 11 Frame 12 Bottom plate 13 Vibration system coupling part 14 Center pole extension part 15 Gap 16 Ring for connecting voice coil to diaphragm and damper 17 Yoke upper surface 18 Magnetic circuit

 ──────────────────────────────────────────────────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 BA02 BA03 BB02 BB03 BB04 BB05 CA02 CA07 CA09 FA10

Claims (8)

[Claims] A magnetic circuit, a diaphragm located on the outer periphery of the magnetic circuit, a damper located on the outer periphery of the magnetic circuit and below the diaphragm, and a damper inserted into the magnetic circuit, A speaker comprising: at least one of the diaphragm and the damper on an outer side; and a voice coil having a shape fixed to one or more portions in a horizontal direction with respect to a center axis of the magnetic circuit. 2. The magnetic circuit is fixed to a bottom plate, a magnet fixed to an upper surface of the bottom plate, a center pole fixed to an upper surface of the magnet, and to an upper surface and an outer periphery of the bottom plate. A yoke, wherein the yoke of the magnetic circuit is divided into two or more, and the magnetic circuit further includes a gap serving as a slit between the divided yokes, and a magnetic gap between the center pole and the yoke. The speaker according to claim 1, further comprising a gap serving as a gap, wherein the voice coil is inserted into the magnetic gap and the slit. 3. The magnetic circuit includes: a bottom plate; a center pole fixed to an upper surface of the bottom plate; a magnet fixed to an upper surface of the bottom plate along an outer periphery of the center pole; A yoke fixed to an upper surface, the yoke of the magnetic circuit is divided into two or more, the magnet of the magnetic circuit is divided corresponding to the yoke, and the magnetic circuit is further divided. A gap serving as a slit between the yokes, and a gap serving as a magnetic gap between the center pole and the yoke, wherein the voice coil is inserted into the magnetic gap and the slit. The speaker according to claim 1, wherein 4. The yoke is divided according to the shape of the voice coil.
Speaker. 5. The voice coil according to the divided yoke and at least one of the diaphragm or the damper outside the magnetic circuit and at least one portion in a horizontal direction with respect to a center axis of the magnetic circuit. The speaker according to claim 2, wherein the speaker is formed so as to be fixed. 6. The center pole has an extension inserted into the slit between the divided yokes, and the magnetic circuit is provided between the extension of the center pole and the divided yoke. The speaker according to any one of claims 2 to 5, wherein a magnetic gap is provided in the gap. 7. The voice coil is formed in a polygonal shape when viewed from the top of the speaker, and each vertex of the voice coil is fixed to at least one of the diaphragm or the damper. Item 7. The speaker according to any one of Items 1 to 6. 8. The speaker according to claim 1, further comprising a ring fixed to an outer periphery of the voice coil, wherein the ring is fixed to at least one of the diaphragm and the damper. The speaker according to any one of claims 1 to 4.