JP2002209296A - Loud speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that a speaker to be thinned by providing radial slits in a yoke and internally arranging a connection member which comprises a support piece for connecting a voice coil and a diaphragm to the slits is disadvantageous in mass production since the connection member is fixed to the outer periphery of the voice coil and the shape of the connection member is required to correspond to the change of an outer diameter when the diameter of a voice coil wire is changed to cause the change of the outside diameter of the voice coil. SOLUTION: The support piece is molded in a step shape from an inner periphery toward the outer periphery and the upper end part of the support piece is connected with a thin plate. With the structure, the connection member comprising the support piece is fixed to a voice coil bobbin and necessity for change is eliminated in the shape of the connection member associated with the change of the outside diameter of the voice coil in accordance with the change of the voice coil wire diameter. Besides, strength is improved in the connection member and a dust-proof effect is enhanced in a magnetic circuit.

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 Application No. 53-138617.

FIG. 26 is a sectional view of the structure of a speaker disclosed in Japanese Patent Application Laid-Open No. 55-64500, and FIG. 27 is a plan view of the periphery of a magnetic circuit viewed from the upper surface of the diaphragm of the speaker.

[0004] 1 is a magnet, 2 is a center pole, 3
Is a yoke, 23 is a bottom plate, and these constitute a magnetic circuit. Reference numeral 4 denotes a magnetic gap, and a magnetic flux is generated in the magnetic gap by a configuration of a magnetic circuit. 5 is a supporting piece, 6 is a ring to which the supporting piece is fixed, 7 is a connecting member composed of the supporting piece and the ring, 8 is a diaphragm attached to an outer peripheral portion of the connecting member, and 9 is an inner peripheral portion of the connecting member. Reference numeral 10 denotes a voice coil, 10 denotes a damper, 11 denotes a slit provided on the yoke 3 and the support piece 5 is inserted, and 12 denotes a frame.

In the above configuration, when an electric input is applied to the voice coil 9, a magnetic flux generated in the magnetic gap 4 generates a vertical driving force on the voice coil 9 in accordance with Fleming's left-hand rule. 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 concern that the diaphragm 8 hits the upper surface 3a of the yoke, there is no need to design the overall height in consideration of the margin of the amplitude, and the overall height h of the speaker can be reduced.

[0006]

However, FIG.
6. In the speaker disclosed in Japanese Patent Application Laid-Open No. 55-64500 in FIG. 27, a coupling member must be attached to the outer periphery of the voice coil. Each time the outer diameter of the coil changes, the inner diameter of the connecting member, which is the connecting portion with the voice coil, must be changed. Therefore, it is necessary to design a kind of dedicated coupling member for one voice coil, which increases the cost of parts and production equipment at the time of mass production, and takes time to manage the parts.

[0007]

According to the present invention, there is provided a loudspeaker comprising: a magnet fixed to an upper surface of a bottom plate; and a magnet fixed to the magnet or the upper surface of the bottom plate. A magnetic circuit comprising a center pole and a yoke provided with radial slits, forming a gap serving as a magnetic gap between the center pole and the yoke, and a voice coil bobbin inserted into the magnetic gap A voice coil, a diaphragm located outside the magnetic circuit, and a damper; and a plurality of voice coils fixed to the outer periphery of the voice coil bobbin, inserted into the slit, and formed toward the outer periphery of the magnetic circuit. And the shape of the lower end of the support piece is at least one or more steps toward the outer periphery of the magnetic circuit. And has a structure in which at least one of the diaphragm and the damper is fixed to the outer periphery of the support piece, or two annular rings having different diameters, and inserted into the slit, and toward the outer periphery of the magnetic circuit. Formed, comprising a plurality of support pieces sandwiched between the two rings, the shape of the lower end portion of the support piece is formed in at least one step or more steps toward the outer peripheral direction of the magnetic circuit, Of the two annular rings, the upper surface of the voice coil or the outer periphery of the voice coil bobbin is fixed to the inner periphery of the smaller diameter, and at least one of the diaphragm and the damper is fixed to the outer periphery of the larger diameter. It has a structure in which the upper end of the support piece is joined with a thin plate, or the outer circumference of the voice coil or voice coil bobbin is located on the inner circumference with the smaller diameter of the two annular rings. Fixation, and the larger outer periphery of the diameter, or has a plurality of thin plates, the structure for fixing the at least one vibrating plate or damper,
Of the two annular rings, the outer periphery of the voice coil or the voice coil bobbin is fixed to the inner periphery of the smaller diameter, and at least one of the diaphragm or the damper is fixed to the outer periphery of the larger diameter. The periphery has a structure for fixing a plurality of thin plates located on at least one of both sides of the support piece.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIGS. The same components as those of the conventional speaker shown in FIGS. 26 and 27 are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) FIG. 1 is a plan view showing a periphery of a magnetic circuit of a speaker according to a first embodiment of the present invention as viewed from the upper surface side of a diaphragm.

FIG. 2 is a cross-sectional view taken along the line AOB of FIG. 1 of the entire speaker according to the first embodiment.

Reference numeral 13 denotes a voice coil bobbin attached to the inner periphery of the voice coil 9; 9a, a bottom surface of the voice coil;
Is a support piece that is inserted into a slit 11 provided in the yoke and is formed in a two-step shape, and 20 is a bottom surface of the support piece. The outer periphery of the voice coil bobbin 13 is fixed to the inner periphery of the support piece 16, and the diaphragm 8 or the inner periphery of the damper 10 is fixed to the outer periphery. The bottom surface of the voice coil 9a is located below the bottom surface 20 of the support piece. Here, as shown in FIG. 2, the bottom surface 20 of the support piece is located below the lower end of the diaphragm.

The operation of the above configuration will be described.

A magnetic flux density is generated in the magnetic gap 4 by the magnet 1, the yoke 3, which has radial slits, the center pole 2, and the bottom plate 14. When an electric input is applied to the voice coil, the voice coil 9 generates a driving force that vibrates up and down according to Fleming's left hand rule. The driving force generated in the voice coil 9 is transmitted to the voice coil 9, the voice coil bobbin 13, the support piece 16, and the diaphragm 8, and oscillates the diaphragm 8 up and down in proportion to an electric input to emit sound. .

The effect of the above configuration will be described.

If the diameter of the voice coil is changed to adjust the speaker characteristics, the outer diameter of the voice coil changes.
In the above configuration, since the voice coil is wound around the voice coil bobbin and the circumference without the support piece is attached to the outer circumference of the voice coil bobbin, the inner diameter of the support piece or the radial width of the support piece is changed even when the outer diameter of the voice coil changes. Since there is no need, a kind of support piece can be used for voice coils of all wire diameters. Therefore, the speaker characteristics can be easily adjusted, and the cost can be reduced and the management of parts can be simplified in mass production of various types.

In the conventional speaker shown in FIG. 26, the coupling member is fixed to the outside of the voice coil. Therefore, when the outer diameter of the voice coil is changed, it is necessary to change the inner diameter of the ring each time. However, only a voice coil having one wire diameter can be supported.

[0017] By making the support piece step-like, the connecting position of the diaphragm and the support piece can be located near the horizontal plane where the voice coil is located, so that the overall height of the speaker can be kept low.

As shown in FIG. 2, since the bottom surface of the voice coil is located below the bottom surface of the support piece, the amplitude margin Y between the bottom surface of the support piece and the frame in the vertical vibration direction.
Is equal to or larger than the amplitude margin X between the bottom surface of the voice coil and the yoke. Therefore, when setting the amplitude margin of the speaker, it is only necessary to consider the amplitude margin X between the bottom surface of the voice coil and the yoke, and the design becomes easy, and the damage due to the contact between the bottom surface of the support piece and the frame can be reduced. .

Further, as shown in FIG. 2, when the bottom surface of the support piece is located above the bottom surface of the voice coil, the overall height of the support piece is lower than when the bottom surface of the support piece is located below the bottom surface of the voice coil. As a result, the weight of the support piece is reduced, and the efficiency of the speaker can be improved.

FIG. 2 shows an inner magnet type magnetic circuit for fixing the magnet 1 below the center pole 2.
As shown in FIG. 3, a center pole 2 fixed to the upper portion of the bottom plate 23, a magnet 1 fixed to the upper surface of the bottom plate 23 along the outer periphery of the center pole 2, and a yoke fixed to the upper surface of the magnet 1. 3 may be provided, and an outer magnet type magnetic circuit in which a slit is provided in the magnet similarly to the yoke.

(Embodiment 2) FIG. 4 is a plan view showing the periphery of a magnetic circuit of a speaker according to a second embodiment of the present invention as viewed from the upper surface side of the diaphragm.

FIG. 5 is a sectional view taken along the line AOB of FIG. 3 of the entire speaker according to the second embodiment.

Reference numeral 13 denotes a voice coil bobbin attached to the inner periphery of the voice coil 9; 9a, a bottom surface of the voice coil;
Is an inner ring (hereinafter referred to as “inner ring”) for fixing the outer periphery of the voice coil bobbin 13, 15 is an outer ring (hereinafter referred to as “outer ring”) for fixing at least one inner peripheral portion of the diaphragm 8 or the damper 10, and 21 is Bottom of outer ring, 1
6a is inserted into a slit 11 provided in the yoke,
It is a support piece formed in a step-like shape. Reference numeral 17 denotes a connecting member formed by holding a support piece between the inner ring and the outer ring. The bottom surface of the voice coil 9a is located below the bottom surface 21 of the outer ring.

The operation of the above configuration will be described.

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, the voice coil 9 generates a driving force that vibrates up and down according to Fleming's left hand rule. The driving force generated in the voice coil 9 is transmitted to the voice coil 9, the voice coil bobbin 13, the coupling member 17, and the diaphragm 8, and oscillates the diaphragm 8 up and down in proportion to an electric input to radiate sound. I do.

The effect of the above configuration will be described.

When the wire diameter of the voice coil is changed to adjust the speaker characteristics, the outer diameter of the voice coil changes.
In the above configuration, since the voice coil is wound around the voice coil bobbin and the inner ring is attached to the outer periphery of the voice coil bobbin, it is not necessary to change the inner diameter of the inner ring even when the voice coil wire diameter changes. It can correspond to voice coil of diameter.
Therefore, it is easy to adjust the speaker characteristics, and at the time of mass production of a wide variety of products, it is possible to reduce the cost and facilitate the management of parts.

By making the supporting pieces stepwise, the connecting position between the diaphragm and the supporting pieces can be located near the horizontal plane where the voice coil is located, so that the overall height of the speaker can be kept low.

Further, as shown in FIG. 5, since the bottom surface of the voice coil is located below the bottom surface of the outer ring, the amplitude margin Z between the bottom surface of the outer ring and the frame in the direction of vertical vibration is reduced. Amplitude margin X between bottom and yoke
Equal or greater. Therefore, when setting the amplitude margin of the speaker, it is only necessary to consider the amplitude margin X between the bottom surface of the voice coil and the yoke. This facilitates the design, and at the time of mass production, the damage caused by the contact between the bottom surface of the outer ring and the frame. Can be reduced.

Further, as shown in FIG. 5, when the bottom surface of the outer ring is located above the bottom surface of the voice coil, the overall height of the outer ring is lower than when the bottom surface of the outer ring is located below the bottom surface of the voice coil. As a result, the weight of the support piece is reduced, and the efficiency of the speaker can be improved. here,
As shown in FIG. 5, the bottom surface of the outer ring is located below the lower end of the diaphragm.

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

In addition, by shaping the support piece in a stepped manner, the lower portion of the outer ring can be reinforced in the radial direction, so that unnecessary resonance of the outer ring is suppressed, and the driving force generated in the voice coil is reduced. Can be transmitted to the diaphragm without loss, so that the sound pressure characteristics and sound quality of the speaker are not impaired, and the coupling member can be prevented from being mechanically damaged.

Further, the connecting member composed of the inner ring, the outer ring and the support piece may be integrally formed of a resin material.

Further, the outer ring may be formed as a vibration plate, or the coupling member and the vibration plate may be formed integrally.

By integrally molding, the number of parts can be reduced, the production becomes easy, and the product cost can be reduced.

FIG. 5 shows an inner magnet type magnetic circuit for fixing the magnet 1 below the center pole 2.
As shown in FIG. 6, a center pole 2 fixed to the upper portion of the bottom plate 23, a magnet 1 fixed to the upper surface of the bottom plate 23 along the outer periphery of the center pole 2, and a yoke fixed to the upper surface of the magnet 1 3 may be provided, and an outer magnet type magnetic circuit in which a slit is provided in the magnet similarly to the yoke.

(Embodiment 3) FIG. 7 is a plan view of a coupling member of a speaker according to a third embodiment of the present invention as viewed from the bottom side of a magnetic circuit.

FIG. 8 is a sectional view taken along the line AOB of FIG. 7 of the entire loudspeaker according to the third embodiment.

13 is a voice coil bobbin attached to the inner periphery of the voice coil 9, 9a is the bottom surface of the voice coil, 14
a is an inner ring for fixing the outer periphery of the voice coil bobbin 13 (hereinafter, "inner ring"); 15a is an outer ring for fixing at least one inner peripheral portion of the diaphragm 8 or the damper 10; Is a bottom surface of the outer ring, and 16b is a support piece which is inserted into the slit 11 provided in the yoke and is formed in a two-step shape. Reference numeral 17a denotes a connecting member formed by holding a connector between an inner ring and an outer ring. Reference numeral 18 denotes a thin plate connecting the upper ends of the support pieces. The bottom surface 9a of the voice coil is located below the bottom surface 21a of the outer ring.

The operation of the above configuration will be described.

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, the voice coil 9 generates a driving force that vibrates up and down according to Fleming's left hand rule. The driving force generated in the voice coil 9 is determined by the voice coil 9, the voice coil bobbin 13, and the coupling member 17a.
The vibration is transmitted to the thin plate 18 and the diaphragm 8, and the diaphragm 8 vibrates up and down in proportion to the electric input to emit sound.

The effect of the above configuration will be described.

When the wire diameter of the voice coil is changed to adjust the speaker characteristics, the outer diameter of the voice coil changes.
In the above configuration, since the voice coil is wound around the voice coil bobbin and the inner ring is attached to the outer periphery of the voice coil bobbin, it is not necessary to change the inner diameter of the inner ring even when the voice coil wire diameter changes. It can correspond to voice coil of diameter.
Therefore, it is easy to adjust the speaker characteristics, and at the time of mass production of a wide variety of products, it is possible to reduce the cost and facilitate the management of parts.

As shown in FIG. 8, since the bottom surface of the voice coil is located below the bottom surface of the outer ring, the amplitude margin Z between the bottom surface of the outer ring and the frame in the direction of up-and-down vibration is reduced. Amplitude margin X between bottom and yoke
Equal or greater. Therefore, when setting the amplitude margin of the speaker, it is only necessary to consider the amplitude margin X between the bottom surface of the voice coil and the yoke, so that the design becomes easy, and at the time of mass production, damage due to the contact between the bottom surface of the outer ring and the frame. Can be reduced. Further, since the height of the outer peripheral ring is reduced, the weight of the coupling member is reduced, and the efficiency of the speaker can be improved. Here, as shown in FIG. 8, the bottom surface of the outer ring is located below the lower end of the diaphragm.

By making the support pieces stepwise, the connecting position between the diaphragm and the support pieces can be located near the horizontal plane where the voice coil is located, so that the overall height of the speaker can be kept low and Since the lower part of the ring can be reinforced in the radial direction, unnecessary resonance of the outer ring can be suppressed, the driving force generated in the voice coil can be transmitted to the diaphragm without loss, and the sound pressure characteristics and sound quality of the speaker Can be prevented, and the coupling member can be prevented from being mechanically damaged. The above is Embodiment 2
It is the same effect as.

Further, since the upper surface of the slit 11 and the upper surface 3a of the yoke are covered with the thin plate 18, dust can be prevented from being applied to the slit and the magnetic gap. Also, the thin plate 18
Is designed to resonate or vibrate in a high frequency region, for example, around 10 kHz, so that the high-frequency characteristics of the speaker can be compensated. The thin plate 18 also has the effect of further reinforcing the connecting member 17a.

FIGS. 9 and 10 show another shape around the coupling member according to the third embodiment.

As shown in FIG. 9, the voice coil bobbin may be fixed to the connector by omitting the inner ring. In this case, the weight of the inner ring is reduced, so that the efficiency of the speaker is improved.

Alternatively, even if the outer ring is omitted as shown in FIG. 10, the same effect can be obtained.

FIG. 11 is a plan view of the coupling member according to the third embodiment viewed from the upper surface side of the diaphragm having another shape. As shown in FIG. 11, the thin plate 18c is
The upper surface of e may be partially joined, and the weight of the joining member can be adjusted.

FIGS. 12 and 13 are cross-sectional views of a coupling member and a thin plate having different shapes according to the third embodiment.

As shown in FIG. 12, the structure may be such that the entire coupling member is covered, so that the dustproof effect on the entire magnetic circuit and the high-frequency characteristics of the speaker can be adjusted.

FIG. 13 shows that the thin plate may have an arc-shaped cross section, so that the high frequency characteristics of the speaker can be changed.

As shown in FIG. 14, the outer ring may have an L-shaped cross section. In this case, the strength of the outer ring increases. Further, since the diaphragm or the damper can be adhered to the L-shaped bottom portion, manufacturing becomes easy, and the bonding strength of the diaphragm or the damper to the connecting member is increased, so that the speaker can be made more difficult to be damaged.

The connecting member and the thin plate may be integrally formed, or different materials may be combined. Further, the connecting member composed of the inner ring, the outer ring, the support piece, and the thin plate may be integrally formed of a resin material. Furthermore, the outer ring can be formed integrally with the diaphragm. The diaphragm and the coupling member may be integrally formed. It can be arbitrarily selected at the time of manufacture in consideration of the ease of manufacture, weight, reinforcement effect, and effect of adjusting the high-frequency characteristics of the speaker.

FIG. 8 shows an inner magnet type magnetic circuit for fixing the magnet 1 below the center pole 2.
As shown in FIG. 15, a center pole 2 fixed to the upper portion of the bottom plate 23, a magnet 1 fixed to the upper surface of the bottom plate 23 along the outer periphery of the center pole 2,
An external magnetic circuit may be provided in which a yoke 3 fixed to the upper surface of the magnet 1 is provided and a slit is provided in the magnet similarly to the yoke.

(Embodiment 4) FIG. 16 is a plan view of a coupling member of a speaker according to a fourth embodiment of the present invention as viewed from the upper surface side of the diaphragm.

FIG. 17 is a cross-sectional view taken along the line AOB of FIG. 16 of the entire speaker according to the fourth embodiment.

16h is the inner ring 14f and the outer ring 1
The supporting piece 19 sandwiched by 5f is an outer thin plate formed on the outer periphery of the outer ring 15 (hereinafter, “outer thin plate”).
A coupling member 17g is constituted by the inner ring 14f, the outer ring 15f, and the support piece 16h. The thin plate 18f is configured to connect the upper ends of the support pieces. 9a is the bottom surface of the voice coil, 21b is the bottom surface of the outer ring, and the bottom surface 9a of the voice coil is located below the outer ring 21b.

The operation of the above configuration will be described.

A magnetic flux density is generated in the magnetic gap 4 by the magnet 1, the yoke 3, which has radial slits, the center pole 2, and the bottom plate 14. When an electric input is applied to the voice coil, the voice coil 9 generates a driving force that vibrates up and down according to Fleming's left hand rule. The driving force generated in the voice coil 9 is determined by the voice coil 9, the voice coil bobbin 13, and the coupling member 17.
g, which is transmitted to the diaphragm 8 and vibrates the diaphragm 8 up and down in proportion to the electric input to emit sound.

The effect of the above configuration will be described.

When the wire diameter of the voice coil is changed to adjust the speaker characteristics, the outer diameter of the voice coil changes.
In the above configuration, the voice coil is wound around the voice coil bobbin, and the inner ring is attached to the outer periphery of the voice coil bobbin. It can correspond to voice coil of diameter.
Therefore, it is easy to adjust the speaker characteristics, and at the time of mass production of a wide variety of products, it is possible to reduce the cost and facilitate the management of parts.

Further, as shown in FIG. 17, since the bottom surface of the voice coil is located below the bottom surface of the outer ring, the amplitude margin Z between the bottom surface of the outer ring and the frame in the direction of vertical vibration can be reduced. It is equal to or larger than the amplitude margin X between the bottom surface and the yoke. Therefore, when setting the amplitude margin of the speaker, it is only necessary to consider the amplitude margin X between the bottom surface of the voice coil and the yoke. This facilitates the design, and at the time of mass production, the damage caused by the contact between the bottom surface of the outer ring and the frame. Can be reduced.

Further, as shown in FIG. 17, the bottom surface of the outer ring is located lower than the bottom surface of the voice coil.
When the bottom surface of the outer ring is located above the bottom surface of the voice coil, the overall height of the outer ring can be reduced, so that the weight of the support piece is reduced and the efficiency of the speaker can be improved. Here, as shown in FIG. 17, the bottom surface of the outer ring is located below the lower end of the diaphragm.

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

Since the upper surface of the slit 11 and the upper surface 3a of the yoke are covered with the thin plate 18f, dust can be prevented on the slit and the magnetic gap. Also, the thin plate 18f is
For example, when the speaker is designed to resonate or vibrate in a high frequency region around 10 kHz, the high frequency characteristics of the speaker can be compensated. The thin plate 18f has an effect of further reinforcing the coupling member 17g.

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

The support piece 16h can be easily formed if it has a rectangular cross section as shown in FIG. Furthermore, by fixing the outer thin plate 19 to the outer periphery of the outer ring 15f, the reinforcing effect of the outer ring can be improved.

In FIG. 17, the height of the outer thin plate in the vibration direction is located on the same horizontal plane as the bottom surface of the support piece, but may be longer as shown in FIG. 18 to increase the reinforcing effect of the connecting member. .

Further, as shown in FIG. 19, the support piece and the outer thin plate need not be coaxial in radiation.

In FIG. 17, the cross-sectional shape of the support piece 16h is square, but it may be step-like as shown in FIG. In this case, the effect of reinforcing the coupling member is improved as compared with the case where the cross-sectional shape of the support piece in FIG. 17 is square.

Although not particularly shown in the drawings, the number of thin plates and the number of support pieces need not be the same. The above-mentioned changes can be arbitrarily selected at the time of manufacturing in consideration of the reinforcing effect, the weight of the coupling member, and the ease of manufacturing.

FIG. 17 shows an internal magnetic circuit in which the magnet 1 is fixed below the center pole 2. As shown in FIG. 21, the center pole 2 is fixed above the bottom plate 23, and Magnet 1 fixed to the upper surface of bottom plate 23 along the outer periphery of center pole 2
And a yoke 3 fixed to the upper surface of the magnet 1,
An outer-magnet-type magnetic circuit in which a slit is provided in the magnet similarly to the yoke may be used.

(Embodiment 5) FIG. 22 is a plan view of a coupling member of a speaker according to a fifth embodiment of the present invention as viewed from the bottom side of a magnetic circuit.

FIG. 23 is a diagram showing the coupling member and the magnetic circuit of the loudspeaker according to the fifth embodiment, which are taken along the line A--O-- in FIG.
It is a figure which shows B sectional drawing.

16l is the inner ring 14j and the outer ring 1
The supporting piece 22 held by 5j is a reinforcing piece (hereinafter referred to as a "reinforcing piece") attached to the inner periphery of the outer ring. A coupling member 17k is formed by the inner ring 14j, the outer ring 15j, and the support piece 16l. The thin plate 18j is configured to connect the upper ends of the support pieces. 9a is the bottom surface of the voice coil, 21c is the bottom surface of the outer ring.
a is located below the outer ring 21c.

The operation of the above configuration will be described.

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, the voice coil 9 generates a driving force that vibrates up and down according to Fleming's left hand rule. The driving force generated in the voice coil 9 is determined by the voice coil 9, the voice coil bobbin 13, and the coupling member 17.
k, the vibration is transmitted to the diaphragm 8, and the diaphragm 8 vibrates up and down in proportion to the electric input to emit sound.

The effect of the above configuration will be described.

When the wire diameter of the voice coil is changed to adjust the speaker characteristics, the outer diameter of the voice coil changes.
In the above configuration, the voice coil is wound around the voice coil bobbin, and the inner ring is attached to the outer periphery of the voice coil bobbin. It can correspond to voice coil of diameter.
Therefore, the speaker characteristics can be easily adjusted, and the cost can be reduced and the management of parts can be simplified in mass production of various types.

Further, as shown in FIG. 23, since the bottom surface of the voice coil is located below the bottom surface of the support piece, the amplitude margin between the outer ring and the frame in the direction of vertical vibration can be reduced. Equal to or larger than the amplitude margin of Therefore, when setting the amplitude margin of the speaker, it is only necessary to consider the amplitude margin between the bottom surface of the voice coil and the yoke.
During mass production, damage due to contact between the bottom surface of the outer peripheral ring and the frame can be reduced. Here, as shown in FIG. 23, the bottom surface of the support piece is located below the lower end of the diaphragm.

Further, as compared with the case where the bottom surface of the outer ring is located below the bottom surface of the voice coil, as shown in FIG.
When the bottom surface of the outer ring is located above the bottom surface of the voice coil, the overall height of the outer ring can be reduced, so that the weight of the support piece is reduced and the efficiency of the speaker can be improved.

Since the upper surface of the slit 11 and the upper surface 3a of the yoke are covered by the thin plate 18j, dust can be prevented on the slit and the magnetic gap. Also, the thin plate 18j is
For example, when the speaker is designed to resonate or vibrate in a high frequency region around 10 kHz, the high frequency characteristics of the speaker can be compensated. The thin plate 18j has an effect of further reinforcing the coupling member 17k.

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

If the support piece 16l is formed in a rectangular cross section as shown in FIG. 23, the molding becomes easy. Further, as shown in FIG. 23, the reinforcing member 22 is fixed to the inner periphery of the outer ring 15j adjacent to the supporting member 16l, so that the connecting member 17 is fixed.
k, in particular, the reinforcing effect between the support pieces can be improved. This is effective when reinforcement using only the support pieces is insufficient.

Further, as shown in FIG. 17 shown in the fourth embodiment, when the thin plate 19 is provided on the outer circumference of the outer ring, a structure for mounting the diaphragm or the damper on the outer circumference ring while avoiding the thin plate is required. However, in FIG. 23, since a thin plate is not required on the outer periphery of the outer peripheral ring, the diaphragm or the damper can be easily attached to the outer peripheral ring without impairing the reinforcing effect, and the productivity is improved.

The reinforcing pieces can be provided only on one side of the support pieces as shown in FIG. 24, or can be randomly arranged as shown in FIG. The effect of dispersing the resonance frequency of the coupling member so that a single resonance frequency does not adversely affect the speaker characteristics can be expected.

[0089]

As described above, the loudspeaker of the present invention has a magnet fixed to the upper surface of the bottom plate, the magnet, or the center pole and the radial slit fixed to the upper surface of the bottom plate. A magnetic circuit comprising a gap provided 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; and A diaphragm and a damper positioned outside the voice coil bobbin, and a plurality of support pieces that are inserted into the slits and formed toward the outer circumference of the magnetic circuit. The shape of the lower end of the piece is formed in at least one step toward the outer peripheral direction of the magnetic circuit, and is formed outside the support piece. Or at least one of the diaphragm and the damper, or two annular rings having different diameters, and inserted into the slit and formed toward the outer periphery of the magnetic circuit, and the two rings A plurality of support pieces sandwiched between, the shape of the lower end portion of the support piece is formed in at least one step or more steps toward the outer peripheral direction of the magnetic circuit, the diameter of the two annular rings The upper surface of the voice coil or the outer periphery of the voice coil bobbin is fixed to the inner periphery of the smaller one, and at least one of the diaphragm and the damper is fixed to the outer periphery of the larger diameter. The outer periphery of the voice coil or the voice coil bobbin is fixed to the inner circumference of the smaller diameter ring of the two annular rings, and the outer circumference of the larger diameter ring is fixed. Has a structure in which a plurality of thin plates and at least one of a diaphragm and a damper are fixed, or a voice coil or a voice coil bobbin is fixed to an outer periphery of a smaller diameter of two annular rings. The outer periphery having the larger diameter has at least one of a diaphragm and a damper fixed thereto, and the inner periphery has a structure in which a plurality of thin plates positioned on at least one of both sides of the support piece are fixed. Even if the outer diameter of the voice coil changes due to the voice coil of any wire diameter, it can be handled with a kind of connecting member, which is advantageous in terms of parts management and manufacturing cost, and also increases the reinforcing effect of the connecting member. This is practically advantageous in that the characteristics of the loudspeaker are not degraded and the coupling member can be prevented from being damaged.

[Brief description of the drawings]

FIG. 1 is a plan view of a periphery of a magnetic circuit according to a first embodiment of the present invention, as viewed from an upper surface side of a diaphragm.

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 of an external magnetic circuit according to Embodiment 1 of the present invention;

FIG. 4 is a plan view of a periphery of a magnetic circuit according to a second embodiment of the present invention, viewed from the upper surface side of a diaphragm.

FIG. 5 is a structural sectional view of a speaker according to a second embodiment of the present invention.

FIG. 6 is a structural sectional view of a speaker of an external magnetic circuit according to Embodiment 2 of the present invention;

FIG. 7 is a plan view of the coupling member according to the third embodiment of the present invention as viewed from the magnetic circuit side.

FIG. 8 is a structural sectional view of a speaker according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view of the periphery of a coupling member having another shape according to the third embodiment of the present invention.

FIG. 10 is a cross-sectional view around a coupling member having another shape according to the third embodiment of the present invention.

FIG. 11 is a plan view of a coupling member of another shape according to Embodiment 3 of the present invention, as viewed from the upper surface side of the diaphragm.

FIG. 12 is a cross-sectional view around a coupling member having another shape according to the third embodiment of the present invention;

FIG. 13 is a cross-sectional view around a coupling member having another shape according to the third embodiment of the present invention.

FIG. 14 is a cross-sectional view around a coupling member of another shape according to Embodiment 3 of the present invention.

FIG. 15 is a structural sectional view of a speaker of an external magnetic circuit according to a third embodiment of the present invention.

FIG. 16 is a plan view of the coupling member according to the fourth embodiment of the present invention as viewed from the bottom side of the magnetic circuit.

FIG. 17 is a structural sectional view of a speaker according to a fourth embodiment of the present invention.

FIG. 18 is a cross-sectional view around a coupling member having another shape according to the fourth embodiment of the present invention.

FIG. 19 is a plan view of the coupling member of another shape according to the fourth embodiment of the present invention, as viewed from the bottom side of the magnetic circuit.

FIG. 20 is a cross-sectional view around a coupling member of another shape according to the fourth embodiment of the present invention.

FIG. 21 is a structural sectional view of a speaker of an external magnetic circuit according to a fourth embodiment of the present invention.

FIG. 22 is a plan view of the coupling member according to the fifth embodiment of the present invention as viewed from the bottom side of the magnetic circuit.

FIG. 23 is a structural sectional view around a magnetic circuit of a speaker according to a fifth embodiment of the present invention.

FIG. 24 is a plan view of the coupling member of another shape according to the fifth embodiment of the present invention, as viewed from the bottom side of the magnetic circuit.

FIG. 25 is a plan view of the coupling member of another shape according to the fifth embodiment of the present invention, as viewed from the bottom side of the magnetic circuit.

FIG. 26 is a structural sectional view of a conventional speaker.

FIG. 27 is a plan view of the periphery of a magnetic circuit of a conventional speaker viewed from the upper surface side of a diaphragm.

[Explanation of symbols]

Reference Signs List 1 magnet 2 center pole 3 yoke 3a yoke upper surface 4 magnetic gap 5 support piece 6 ring 7 coupling member 8 diaphragm 9 voice coil 9a voice coil bottom surface 10 damper 11 slit 12 frame 13 voice coil bobbin 14, 14a, 14b, 14c, 14d, 14e, 14
f, 14g, 14h, 14i, 14j, 14k, 14
1,14m inner ring 15,15a, 15b, 15c, 15d, 15e, 15
f, 15g, 15h, 15i, 15j, 15k, 15
1, 15 m Outer ring 16, 16a, 16b, 16c, 16d, 16e, 16
f, 16g, 16h, 16i, 16j, 16k, 16
1, 16m, 16n, 16o Support pieces 17, 17a, 17b, 17c, 17d, 17e, 17
f, 17g, 17h, 17i, 17j, 17k, 17
1, 17m, 17n Coupling members 18, 18a, 18b, 18c, 18d, 18e, 18
f, 18g, 18h, 18i, 18j, 18k, 18
1, 18m thin plate 19, 19a, 19b, 19c, 19d outer thin plate 20 bottom surface of supporting piece 21, 21a, 21b bottom surface of outer ring 22, 22a, 22b thin plate attached to inner periphery of outer ring 23 bottom plate

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shuji Saeki 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5D012 BA06 BB04 CA01 CA07

Claims (15)

[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 located outside the magnetic circuit, and a damper, The voice coil bobbin includes a plurality of support pieces that are fixed to an outer circumference of the voice coil bobbin, are inserted into the slits, and are formed toward an outer circumference of the magnetic circuit. At least one of a diaphragm and a damper is formed on the outer periphery of the support piece at least one step in the outer peripheral direction. A speaker having a structure to fix. 2. 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 located outside the magnetic circuit, and a damper, Two annular rings having different diameters, and are inserted into the slit, and are formed toward the outer periphery of the magnetic circuit, and include a plurality of support pieces sandwiched between the two rings. The shape of the lower end is formed in at least one step toward the outer peripheral direction of the magnetic circuit, and the two annular rings are formed. A speaker having a structure in which an upper surface of a voice coil or an outer peripheral portion of a voice coil bobbin is fixed to an inner periphery having a smaller diameter, and at least one of a diaphragm and a damper is fixed to an outer periphery having a larger diameter. 3. The loudspeaker according to claim 1, wherein the loudspeaker has a structure in which the upper ends of the support pieces are joined by a thin plate. 4. The shape of the lower end portion of the support piece is one step shape toward the outer peripheral direction of the magnetic circuit, and the length of the support piece along the vibration direction of the diaphragm is the outer peripheral side of the magnetic circuit. 4. The loudspeaker according to claim 1, wherein the loudspeaker is formed larger than the inner peripheral side. 5. 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 located outside the magnetic circuit, and a damper, Two annular rings having different diameters are inserted into the slit, and have a constant length along the vibration direction of the diaphragm toward the outer periphery of the magnetic circuit, and are sandwiched between the two rings. A plurality of supporting pieces, and a voice coil or a voice coil A speaker having a structure in which an outer peripheral portion of a bobbin is fixed, and a plurality of thin plates formed integrally with the outer peripheral ring are provided on an outer periphery having a larger diameter, and at least one of a diaphragm and a damper is fixed. 6. The loudspeaker according to claim 5, wherein the loudspeaker has a structure in which the upper ends of the support pieces are joined by a thin plate. 7. A shape of a lower end portion of a plurality of support pieces sandwiched between two rings is formed in at least one or more steps toward an outer peripheral direction of the magnetic circuit. Item 7. The speaker according to item 5 or 6. 8. The shape of the lower end portion of the support piece is one stepped toward the outer peripheral direction of the magnetic circuit, and the length of the support piece along the vibration direction of the diaphragm is equal to the outer peripheral side of the magnetic circuit. 6. The upper part is formed larger than the inner peripheral side.
Or the speaker according to 6. 9. The thin plate attached to the outer periphery of the annular ring having a larger diameter has the same number as that of the support pieces and is located on the radial extension of the support piece.
The speaker according to any one of the above. 10. A center pole comprising: 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. A magnetic circuit forming a gap serving as a magnetic gap, a voice coil wound around a voice coil bobbin inserted into the magnetic gap, a diaphragm located outside the magnetic circuit, and a damper And two annular rings having different diameters, which are inserted into the slits and have a constant length along the vibration direction of the diaphragm toward the outer periphery of the magnetic circuit, and the two rings A plurality of support pieces sandwiched between the two annular rings, and a voice coil or voice The outer periphery of the coil bobbin is fixed, and at least one of the diaphragm and the damper is fixed to the outer periphery with the larger diameter, and the inner periphery is integrally formed so as to be located on at least one of both sides of the support piece. A speaker comprising a plurality of thin plates formed. 11. The loudspeaker according to claim 10, wherein the loudspeaker has a structure in which the upper ends of the support pieces are joined by a thin plate. 12. A cylindrical yoke formed integrally with the outer periphery of the bottom plate and provided with radial slits, a columnar magnet disposed inside the yoke and on the upper surface of the bottom plate, and The internal magnetic type magnetic circuit comprising a columnar center pole disposed on the upper surface and having an air gap serving as a magnetic gap between the center pole and the yoke. Speaker. 13. A columnar center pole integral with the bottom plate, a cylindrical magnet arranged radially on the outer periphery and upper surface of the bottom plate,
An outer-magnet type magnetic circuit having a radial slit, a cylindrical yoke provided on the upper surface of the magnet so that the slit overlaps, and having a gap serving as a magnetic gap between the yoke and a center pole. The speaker according to any one of claims 1, 2, 5, and 10, wherein 14. The voice coil according to claim 1, wherein the bottom surface of the voice coil is located below the bottom surface of the support piece.
The speaker according to any one of the above. 15. The voice coil according to claim 1, wherein a bottom surface of the voice coil is located below a lower end of the diaphragm.
The speaker according to any one of the above.