JPH10191494A - Speaker - Google Patents

Abstract

(57) [Summary] The present invention relates to a loudspeaker having an elongated structure used for various kinds of audio equipment, and to provide a loudspeaker capable of reproducing a low sound range. A loudspeaker according to the present invention has an elongated diaphragm 1, a magnetic circuit 6 disposed corresponding to the diaphragm, and a driving force transmitting member 3 inserted into a magnetic gap of the magnetic circuit 6.
And a substantially S-shaped damper 10 suspended on the frame 11
And a voice coil 4 supported at the center of the damper 10 and coupled to the driving force transmitting member 3. The S-shaped damper 10 suppresses a vertical displacement difference. , The nonlinear distortion at the time of large amplitude is reduced, and the reproduction in the low frequency range is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker having an elongated structure used for various audio equipments, particularly for audiovisual equipment.

[0002]

2. Description of the Related Art Speakers used in audiovisual equipment are mounted on both sides of a cathode ray tube, and thus speakers having an elongated structure such as a square or an ellipse have been used for audiovisual equipment. With the widening of the cathode ray tube, the width of the speaker is required to be further narrowed, and the sound quality of the sound corresponding to the high image quality of the screen is required.

Here, a conventional elongated speaker will be described with reference to FIGS. 13 (a) to 13 (c).

FIG. 13 (a) is a plan view of a conventional speaker having an elongated structure, FIG. 13 (b) is a side sectional view in the same major diameter direction, and FIG.
3 (c) is a side sectional view in the same minor diameter direction.

According to FIG. 1, reference numeral 23 denotes an elongated diaphragm for generating air vibration, and the outer peripheral portion of the diaphragm 23 is held by a frame 24 via an edge 32.

A voice coil bobbin 25 is fixed to an intermediate portion of the diaphragm 23, and the coil bobbin 25 is supported by a frame 24 via a damper 26 so as to be able to vibrate freely.

On the other hand, a magnetic circuit 30 including a yoke 27, a magnet 28, and a top plate 29 is provided in a central concave portion of the frame 24, and a voice coil 31 wound around a voice coil bobbin 25 is provided in a gap of the magnetic circuit 30. Is held, the voice coil bobbin 25 makes a piston movement by the drive current flowing through the voice coil 31, the diaphragm 23 vibrates, and a sound wave is radiated.

[0008]

However, the above-mentioned loudspeaker has the following disadvantages. (1) Since the central portion of the elongated diaphragm 23 is driven in a concentrated manner, the half apex angle in the major diameter direction is too large and the surface rigidity is weakened. In addition, the driving force is less likely to propagate in the major axis direction, split resonance in the major axis direction is likely to occur, and a peak dip occurs in the sound pressure frequency characteristic in the middle and high frequency ranges, resulting in deterioration of the sound pressure frequency characteristic.

(2) Since the damper 26 is configured to fit inside the frame 24, it is necessary to reduce both the radius of curvature and the clamp width. As a result, the stiffness of the vibration system increases, and the lowest resonance frequency f0 Rises,
There is a problem that it becomes difficult to reproduce a low-pitched sound range.

The present invention solves the above-mentioned conventional problems. In spite of the slender structure, split resonance hardly occurs and a flat frequency characteristic is obtained. An object of the present invention is to provide a speaker having an excellent sound quality.

[0011]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises a magnetic circuit having at least a magnetic gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly attached to the frame. A plate-shaped drive having two sides that are coupled and have two sides facing each other in a planar shape as viewed from the vibration direction, and a voice coil unit that is coupled on a substantially symmetric axis of the diaphragm and fitted into the magnetic gap. Composed with a force transmitting member, the distance from the driving force transmitting member to the outermost peripheral portion of the diaphragm can be shortened. Therefore, in the case of a cone paper diaphragm, the half apex angle can be optimized. The driving force can be sufficiently transmitted to the diaphragm, and a straight and flat sound pressure frequency characteristic can be realized.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that a magnetic circuit having at least a magnetic gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly connected to the frame. A plate-shaped driving force transmission having a vibrating plate having two sides whose planar shapes viewed from the vibration direction are opposed to each other, and a voice coil portion coupled to the substantially symmetric axis of the vibrating plate and fitted into the magnetic gap Since it is composed of members, the distance from the driving force transmitting member to the outermost peripheral portion of the diaphragm can be shortened, and a straight and flat sound pressure frequency characteristic can be realized.

According to a second aspect of the present invention, there is provided a magnetic circuit having at least a magnetic gap, a frame mounted on the magnetic circuit, an outer periphery directly or indirectly coupled to the frame, and a vibration direction. A diaphragm having a major axis and a minor axis in plan view, and a plate-like driving force transmitting member having a voice coil portion fitted on the substantially major axis of the diaphragm and fitted into the magnetic gap. It is possible to shorten the distance from the driving force transmitting member to the outermost peripheral part of the diaphragm not only on the short diameter side but also on the long diameter side,
The driving force can be sufficiently transmitted to the diaphragm, and a straight and flat sound pressure frequency characteristic can be realized.

According to a third aspect of the present invention, there is provided a magnetic circuit having at least an annular magnetic air gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly coupled to the frame. A vibrating plate having two sides facing each other in a planar shape viewed from the vibrating direction, a plate-like driving force transmitting member joined on a substantially symmetric axis of the vibrating plate, and directly and / or An inexpensive magnetic circuit comprising a cylindrical voice coil bobbin that is indirectly driven via a plate-shaped driving force transmitting member, and a voice coil wire wound around the lower end of the cylindrical voice coil bobbin. With this configuration, the diaphragm can be driven by both the cylindrical voice coil bobbin and the plate-like driving force transmission member, and the distance from the driving force transmission member to the outermost periphery of the diaphragm is shortened not only on the short diameter side but also on the long diameter side of the diaphragm. Can, in which gentle flat sound pressure frequency characteristic can be transmitted sufficiently diaphragm driving force can be realized.

According to a fourth aspect of the present invention, there is provided a magnetic circuit having at least an annular magnetic gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly connected to the frame. A diaphragm having a major axis and a minor axis in a planar shape as viewed from the vibration direction, a plate-like driving force transmitting member joined on a substantially major axis of the diaphragm, and / or A cylindrical voice coil bobbin, comprising a cylindrical voice coil bobbin indirectly driven via a plate-shaped driving force transmitting member, and a voice coil wire wound around a lower end of the cylindrical voice coil bobbin. The diaphragm can be driven by both the plate-shaped driving force transmission member and the diaphragm, and the distance from the driving force transmission member to the outermost peripheral portion of the diaphragm can be shortened not only on the short diameter side of the vibration plate but also on the long diameter side,
Further, in the middle and high range reproduction, the diaphragm can be directly driven by the voice coil bobbin, and excellent middle and high range reproduction can be realized.

According to a fifth aspect of the present invention, there is provided the diaphragm according to the second aspect, wherein the short-diameter cross section is substantially V
A driving force transmitting member is inserted and coupled to a slit provided in a bottom bent portion that is a substantially long axis, and the driving force transmitting member is not only on the short diameter side of the diaphragm but also on the long diameter side. From the diaphragm to the outermost periphery of the diaphragm,
Therefore, since the half apex angle can be optimized, the rigidity can be improved by the shape effect of the diaphragm made of cone paper, and the driving force can be sufficiently transmitted to the diaphragm to realize a straight and flat sound pressure frequency characteristic. .

According to a sixth aspect of the present invention, there is provided a diaphragm according to the second aspect, wherein the short-diameter cross section is substantially inverted V-shaped up to the vicinity of the long-diameter axis end, and the top bent portion serving as the substantially long-axis The driving force transmitting member is inserted and coupled to the slit provided on the diaphragm, so that the distance from the driving force transmitting member to the outermost peripheral portion of the diaphragm can be shortened not only on the short diameter side of the diaphragm but also on the long diameter side. The half apex angle can be optimized to improve the rigidity due to the shape effect of the cone paper diaphragm, and the driving force can be sufficiently transmitted to the diaphragm, and the directional characteristic is improved because the diaphragm has a substantially inverted V-shape. Good and straightforward sound pressure frequency characteristics can be realized.

According to a seventh aspect of the present invention, in the loudspeaker according to the third or fourth aspect, the diaphragm has at least one circular through hole for bonding a voice coil bobbin, and has a short diameter. Is substantially V-shaped up to near the end of the major axis,
With the configuration having a linear slit in the substantially V-shaped bent portion, it is possible to provide a diaphragm shape that can be used in combination with a plate-shaped driving force transmission member and a cylindrical voice coil bobbin drive,
Since the driving force is transmitted directly from the voice coil bobbin to the diaphragm, excellent characteristics can be realized in high-frequency range reproduction.

According to an eighth aspect of the present invention, in the loudspeaker according to any one of the fifth to seventh aspects, the diaphragm has a V-shape in cross section of a minor axis up to near the end of the major axis. By having a linear slit in the cross-sectional shape of the diaphragm, by increasing the curvature of the cross-sectional curve from the center of the major axis to the end of the major axis to gradually increase the half apex angle,
The formation of a flat part on the paper surface of the cone forming the diaphragm can be avoided, and the rigidity of the flat part of the diaphragm is improved,
It is possible to prevent the occurrence of abnormal noise due to local resonance occurring in the plane portion.

According to a ninth aspect of the present invention, in the loudspeaker according to any one of the fifth to seventh aspects, the diaphragm has a substantially V-shaped cross section having a minor axis up to the vicinity of the end of the major axis. By having a straight slit, and making the bent portion shallow so as to reach the end of the major axis, the half apex angle can be gradually increased, and the cone paper surface forming the diaphragm is twisted and flat. The formation of the portion can be avoided, the rigidity of the flat portion of the diaphragm is improved, and the occurrence of abnormal noise due to local resonance generated in the flat portion can be prevented.

According to a tenth aspect of the present invention, the driving force transmitting member according to the first or fourth aspect uses a high heat resistant resin sheet such as a glass fiber composite polyamideimide resin sheet. In addition, the input resistance of the speaker can be increased.

According to an eleventh aspect of the present invention, the driving force transmitting member according to the first or fourth aspect is characterized in that a resin sheet using a glass fiber composite polyamideimide resin or a metal plate made of aluminum or the like is used. This is a composite substrate made of a material or a core material, which can achieve higher heat resistance and further improve bending rigidity to achieve higher input resistance.

According to a twelfth aspect of the present invention, the voice coil portion of the driving force transmitting member according to the first or second aspect is formed by winding on one surface of a plate-like shape. A part is fitted into the magnetic gap of the magnetic circuit, and a linear driving force can be efficiently applied to the diaphragm, and the efficiency of the speaker can be improved by reducing the weight of the vibration system components. .

According to a thirteenth aspect of the present invention, the voice coil portion of the driving force transmitting member according to the first or second aspect is formed by winding the respective voice coils on both sides of the plate shape so as to be substantially at the same position. Are formed so as to be in the same current direction, at least a part of each of the voice coils is fitted into the magnetic gap of the magnetic circuit. The driving force transmitting member can be prevented from bending in the magnetic gap due to the difference in expansion coefficient, and high input resistance can be achieved.

According to a fourteenth aspect of the present invention, the voice coil of the voice coil part according to the twelfth or thirteenth aspect is formed by printing or vapor deposition. The voice coil section can be formed very easily and stably on the above.

According to a fifteenth aspect of the present invention, the magnetic circuit according to any one of the first to fourth aspects has an annular magnetic gap, and a driving force transmitting member is formed in a cylindrical shape to be fitted into the magnetic gap. And a plate-shaped driving force transmitting member main body coupled to the voice coil unit, so that the magnetic circuit can use a magnetic circuit of a general speaker and can provide an inexpensive speaker.

According to a sixteenth aspect of the present invention, the driving force transmitting member according to the fifteenth aspect includes a cylindrical voice coil portion and a driving force transmitting member main body joining means provided on an upper portion of the voice coil portion. It is composed of a plate-shaped driving force transmitting member main body connected to the voice coil portion by the driving force transmitting member main body joining means. In order to separately manufacture the voice coil portion and the driving force transmitting member main body, Is simple and inexpensive, the rigidity of the cylindrical voice coil bobbin is increased, and the driving force can be effectively transmitted to the plate-shaped driving force transmitting member without deformation of the voice coil bobbin.

According to a seventeenth aspect of the present invention, a loudspeaker according to the first or second aspect has a slit into which a plate-shaped driving force transmitting member is inserted and fixed. A corrugation having a waveform substantially perpendicular to the slit, and a portion deviating from the slit is formed as a semi-concentric corrugation, and a damper for supporting a plate-shaped driving force transmitting member by connecting an outer periphery to a frame is provided. That is, the clamp diameter of the damper of the loudspeaker using the plate-shaped driving force transmitting member is ensured widely, and the lowest resonance frequency f0 is suppressed low, thereby enabling reproduction in a low sound range.

According to an eighteenth aspect of the present invention, in the loudspeaker according to the third or fourth aspect, there is provided a damper joined to the plate-like driving force transmitting member and the cylindrical voice coil bobbin, One or more annular joints with the cylindrical voice coil bobbin, a cutout provided outside of the cylindrical voice coil bobbin except for the major axis direction, and a slit into which a plate-shaped driving force transmitting member is inserted and fixed; By providing a damper formed from a waveform formed by repeating at least one convex or concave parallel to the slit and an outer peripheral joint portion coupled to the frame, the center retention of the cylindrical voice coil bobbin is improved. Prevents abnormal sound from being generated by contact with magnetic circuit components, or achieves high input resistance, and has only a parallel waveform separated from the annular joint. Kept low minimum resonance frequency f0 can be ensured sufficient flexibility in damper for possible Ku formation,
This makes it possible to improve the reproduction of a large-amplitude vibration, that is, a bass range.

According to a nineteenth aspect of the present invention, in the loudspeaker according to the eighteenth aspect, the damper has an annular joint portion with the cylindrical voice coil bobbin, and a plate-like driving force transmitting member inserted and fixed in the major axis direction. A straight joint with slits provided, and a waveform that is parallel to the straight joint and a semi-concentric waveform connected to the straight joint in the waveform forming section further enhances the center retention of the cylindrical voice coil bobbin. It can be improved.

According to a twentieth aspect of the present invention, in the loudspeaker according to the eighteenth aspect, the damper has an annular joint portion with a cylindrical voice coil bobbin at a center portion, and a plate-like driving force transmitting member in a major axis direction. Has a linear joining portion provided with a slit that is partially inserted and fixed, and the annular joining portion is not cut in the circumferential direction by providing the slit at an interval from the annular joining portion, Even when the voice coil bobbin is inserted into the annular joint, the damper does not open in the short diameter direction, so that the workability can be improved and the center retention can be further improved.

An embodiment of the speaker according to the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a structural diagram of a speaker according to an embodiment of the present invention.
(A) is a top view, and (b) of FIG.
1 (c) is a sectional perspective view, and FIG. 2 is a perspective view of a driving force transmitting member as a main part.

According to FIG. 1, reference numeral 1 denotes an elongated track-shaped diaphragm having a major axis and a minor axis in plan view when viewed from the vibration direction. Reference numeral 2 denotes an inner periphery fixed to the outer periphery of the diaphragm 1. The outer periphery of the edge 2 is adhered and fixed to the frame 11. The diaphragm 1 has a short-diameter cross-section that is substantially V-shaped up to the vicinity of the long-diameter axis end, and has a shape that is continuous with a substantially reverse-mounting semi-conical curved surface, has a linear slit in a bottom bent portion, and has a linear slit. Is joined to one plate-shaped driving force transmitting member 3 at the slit. The driving force transmitting member 3 is formed of a single metal plate such as a glass fiber composite polyamide resin sheet or aluminum, or a composite substrate such as a sandwich structure in which the single plate is used as a skin and a core material. have.

The driving force transmitting member 3 is driven by a voice coil 4 wound and formed in a thin and rectangular ring shape on one surface of the lower end of the plate-shaped driving force transmitting member 3 and joined thereto.
And one of the two voice coil portions orthogonal to the vibration axis of the rectangular ring-shaped voice coil 4 and a magnetic circuit 6 having a linear magnetic gap 5 into which the voice coil is inserted. Done.

The magnetic circuit 6 comprises a top plate 7 and a yoke 9
And a rectangular parallelepiped magnet 8 sandwiched by these members.

A damper 10 has a slit at the center in the major axis direction, a driving force transmitting member 3 is fixed, and the voice coil 4 is suspended so as to vibrate without sliding on the magnetic gap 5, and a magnetic circuit is provided. 6 is disposed on the diaphragm side and is adhered and fixed to the frame 11.

The short diameter direction has a corrugation parallel to the slit into which the driving force transmitting member 3 is inserted to the long diameter side end, and has a semi-concentric corrugation from the end to the long diameter side. Holding. 12
Is adhered and fixed to the diaphragm 1 by a dust cap.

The operation of the loudspeaker configured as described above will be described. When a driving current is applied to the voice coil 4, a force is received from the magnetic gap 5, and the plate-shaped driving force transmitting member 3 is received.
The piston moves to transmit and vibrate the driving force over the entire length in the major axis direction of the diaphragm 1 to emit sound waves.

Therefore, the distance from the driving force transmitting member 3 to the outermost periphery of the diaphragm can be shortened not only on the minor diameter side but also on the major diameter side of the diaphragm 1, and in the case of the cone-shaped diaphragm 1, the half vertex angle is optimized. Therefore, the rigidity is achieved by the shape effect of the diaphragm 1, the driving force can be sufficiently transmitted to the diaphragm 1, a straight and flat sound pressure frequency characteristic can be realized, and the clamp diameter of the damper 10 can be widely secured. The low resonance frequency f0 is suppressed to be low to enable reproduction in a low sound range.

Further, a low-frequency signal is applied to two portions of the voice coil 4 orthogonal to the vibration axis of the rectangular ring-shaped voice coil 4 because the driving force currents flow in opposite directions. Becomes larger, the diaphragm 1 can be braked by the driving force in the opposite direction, and the reliability against the input resistance such as the breaking of the diaphragm 1 due to the bottom contact of the voice coil 4 or the striking of the edge at the time of excessive input is improved. Can be improved.

(Embodiment 2) Embodiment 2 of the present invention will be described with reference to FIG. In the following description of the embodiment, the same portions as those of the first embodiment are denoted by the same reference numerals, and the description will be omitted.

According to the figure, the difference from the first embodiment lies in the shape of the diaphragm, and the diaphragm 1 is non-axisymmetric and
The cross section of the minor axis has a substantially inverted V-shape up to the vicinity of the end of the major axis. The directivity characteristics are good, and a straight and flat sound pressure frequency characteristic can be realized, and the distance from the speaker mounting surface of the frame 11 to the magnetic circuit 6 can be shortened to realize a thin speaker.

(Embodiment 3) Embodiment 3 of the present invention will be described with reference to FIG.

According to the figure, the difference from the first embodiment is that the voice coil 4 formed in a rectangular ring shape has the same current on both sides of the lower end of the plate-shaped driving force transmitting member 3 and at the same position. Since the two voice coils 4 are joined so as to flow in the directions, the effective wire length of the voice coil 4 can be increased, and the efficiency of the speaker can be improved.

The driving force transmitting member 3 and the voice coil 4
When the different materials have different coefficients of linear thermal expansion, heat is generated by the drive current and stress is generated in the direction in which the driving force transmitting member 3 bends like a bimetal. Vibration does not occur, so that high input resistance can be achieved.

(Embodiment 4) Embodiment 4 of the present invention will be described with reference to FIG.

According to the figure, the difference from the first embodiment is the configuration of the driving force source, that is, the configuration of the magnetic circuit 15 and the position of the voice coil 4.

The driving force source is a voice coil 4 wound and formed in a thin rectangular ring shape on one surface of an intermediate portion of a plate-shaped driving force transmitting member 3 and bonded to the rectangular ring shape. And a magnetic circuit 15 having two linear magnetic air gaps 14 into which two voice coil portions orthogonal to the vibration axis of the selected voice coil 4 are inserted. Since the directions of the magnetic fluxes are opposite to each other, the driving forces received from the magnetic circuit 15 of the voice coil 4 work in the same direction to obtain a large driving force, so that the efficiency of the speaker can be improved. Further, a second damper 16 fixed to the driving force transmitting member 3 and suspended so as to be vibrable is adhered and fixed to a second frame 17 fixed to the bottom of the magnetic circuit 15 on the rear side of the driving force source. . Thereby, the reliability of the deformation of the driving force transmitting member 3 at a large amplitude and the rubbing of the voice coil 4 with the magnetic gap 14 can be improved.

(Embodiment 5) Embodiment 5 of the present invention will be described with reference to FIG.

According to the figure, the difference from the fourth embodiment is that the voice coil 4 formed in a rectangular ring shape has the same current on both sides of the lower end of the plate-like driving force transmitting member 3 and at the same position. Two voice coil wires are joined so as to flow in two directions, and four voice coil portions formed in the rectangular ring shape and orthogonal to the vibration axis of the joined voice coil 4 are respectively inserted into two portions. Since the driving force is received from the linear magnetic gap 14, the efficiency of the speaker can be further improved.

Embodiment 6 Embodiment 6 of the present invention will be described with reference to FIG. 7A and 7B show a structure of a speaker according to a sixth embodiment of the present invention. FIG. 7A is a top view, and FIG. FIG. 7C is a front perspective view, and FIG.

According to the figure, regarding the driving force source, the frame 1
1, a voice coil 20 wound around the lower end of a cylindrical voice coil bobbin 19 provided with at least one annular magnetic gap 18 and two slits 21 and suspended in the magnetic gap 18; Plate-shaped driving force transmitting member 3 joined to the upper end of cylindrical voice coil bobbin 19
In the configuration of the magnetic circuit having the annular magnetic air gap 18, the planar shape viewed from the vibration direction is an elongated non-axisymmetric diaphragm having a major axis and a minor axis. Since the driving force can be transmitted via the plate-shaped driving force transmitting member, the driving force can be sufficiently transmitted to the diaphragm, and a straight and flat sound pressure frequency characteristic can be realized.

(Embodiment 7) Embodiment 7 of the present invention will be described with reference to FIG.

FIG. 8 is an exploded perspective view showing the relationship between the voice coil bobbin, which is the main part, and the driving force transmitting member.

According to the figure, the difference from the sixth embodiment is through the second driving force transmitting member 22 fitted and joined to the upper end of the cylindrical voice coil bobbin 19 having the voice coil 20 wound around the lower end. A slit 21 is provided at the upper end of the second driving force transmitting member 22 in the major axis direction, and is fitted and joined to the plate-shaped driving force transmitting member 3a to drive the diaphragm 1. By increasing the joint area with the driving force transmitting member 3a, the driving force is transmitted efficiently without loss of the driving force. There is no buckling of the voice coil bobbin 19 and the reliability can be further improved.

Embodiment 8 Embodiment 8 of the present invention will be described with reference to FIG. FIG. 9 shows a structural diagram of a speaker according to an eighth embodiment of the present invention. FIG. 9 (a) is a plan view with a part of the diaphragm removed, and FIG. 9 (b) is a side sectional view along a major axis. 9 (c) is a sectional view taken along the line AA 'in the minor axis, FIG. 9 (d) is a sectional view taken along the line BB' in FIG.
9 (e) is a sectional view taken along the line CC ′, and FIG. 9 (f) is FIG. 9 (a).
FIG. 4 is a partial plan view of the damper in a view in which a plate-like driving force transmitting member is further removed from a portion from which the diaphragm is removed.

Referring to FIG. 10, reference numeral 101 denotes a non-axially symmetric diaphragm having a major axis and a minor axis, such as a rectangle, an ellipse, and a rectangle. The outer periphery is an edge whose inner periphery is fixed, and the outer periphery of the edge 102 is fixed to and held by the frame 103.

The diaphragm 101 has a V-shaped cross section with a minor axis extending in the vicinity of the end of the major axis, and the curvature of the diaphragm cross section increases from the BB 'section to the CC' section to increase the half apex angle. Is gradually increased (α <β), has a shape connected to a substantially inverted mounting type semi-conical curved surface, has a linear slit 105 in the bottom bent portion 104, and has the linear slit 10
5 is joined to one plate-shaped driving force transmission member 106.

The cylindrical voice coil bobbin 107 is annularly joined to the vibration plate 101 to directly transmit the driving force, and the plate-shaped driving force transmitting member 106 is inserted and fixed in the cutout portion 108. Diaphragm 101
The driving force is transmitted to the motor. A voice coil wire loop 1 is provided at the lower end of the cylindrical voice coil bobbin 107.
09 is wound.

The damper 130 has slits in an elongated outer peripheral joint 131 joined to the frame 103, an annular joint 132 with the cylindrical voice coil bobbin 107 inside, and a linear joint 133 with the plate-like driving force transmitting member 106. 1
33a, in a waveform forming portion therebetween, a waveform 134 formed by repeating at least one convex or concave parallel to the linear joining portion 133 and a waveform including a semi-concentric convex or concave connected thereto. 135 and an annular joint 13 with the cylindrical voice coil bobbin 107
2 is provided with a cutout portion 136 except for the major axis direction.

The magnetic circuit 140 is joined to the frame 103 by forming an annular magnetic gap 141 suspended so that the cylindrical voice coil wire 109 can vibrate without contact. The magnetic circuit 140 has a magnetically shielded magnetic circuit configuration, and includes a top plate 142, a yoke 143, a ring-shaped main magnet 144 sandwiched by these members, and a sub-magnetized reverse magnetized joined to the back surface of the yoke 143. The yoke 143 is connected to the back surface of the sub-magnet 145 and the yoke 143 to provide a magnetic shield.
Reference numeral 150 denotes a dust cap joined to the upper end surface of the voice coil bobbin.

The operation of the loudspeaker configured as described above will be described. When a drive current is applied to the voice coil wire loop 109, the voice coil bobbin 107
The voice coil bobbin 107 receives the driving force from 1 and drives the diaphragm 101 directly through the plate-shaped driving force transmitting member 106 and drives the diaphragm 101 to near the end of the major axis of the diaphragm 101 to drive the diaphragm 101 via the plate-shaped driving force transmitting member 106. The force is transmitted and vibrated, and sound waves are emitted. Therefore, the distance from the driving force transmitting member 106 to the outermost periphery of the diaphragm can be shortened not only on the short diameter side but also on the long diameter side of the diaphragm 101, and the driving force can be sufficiently increased.
1 and the half apex angle α <β
1 is twisted, the surface rigidity of the diaphragm surface is improved, the occurrence of abnormal sound due to partial resonance of the diaphragm 101 can be prevented, and a straight and flat sound pressure frequency characteristic can be realized. Since the clamp diameter of 130 can be widely secured, the lowest resonance frequency f0 is suppressed to be low to enable reproduction in a low sound range.

(Embodiment 9) Embodiment 9 of the present invention will be described with reference to FIG. In the following description of the embodiment, the same portions as those of the eighth embodiment will be denoted by the same reference numerals, and description will be omitted.

10 (a) is a plan view with a part of the diaphragm removed, FIG. 10 (b) is a side sectional view on the major axis, and FIG. 10 (c) is AA 'on the minor axis. 10 (d) is a sectional view taken along the line BB 'of FIG.
10 (e) is a sectional view taken along the line CC ′, and FIG.
FIG. 3A is a partial plan view of the damper in a view in which a plate-like driving force transmitting member is further removed from a portion where the diaphragm is removed in FIG.

According to the figure, the difference from the eighth embodiment lies in the shape of the diaphragm, the shape of the joint between the plate-like driving force transmitting member and the damper, and the joining method. 101 is a diaphragm, 10
Reference numeral 6 denotes a plate-shaped driving force transmitting member, 106a denotes a projection of the plate-shaped driving force transmitting member, and a two-dot chain line L1 denotes a joining line between the diaphragm 101 and the plate-shaped driving force transmitting member 106.
From the -B 'section to the CC' section, the total height of the diaphragm is formed shallower and the half apex angle gradually increases (α <β), the surface forming the diaphragm 101 is twisted, and The surface stiffness is improved, and abnormal noise due to partial resonance of the diaphragm 101 can be prevented.

The difference between the damper 130 and the eighth embodiment is that the shape of the slit 133b and the joining method of the annular joint 132 with the cylindrical voice coil bobbin 107 and the linear joint 133 with the plate-shaped driving force transmitting member 106 are different. At the lower end of the plate-like driving force transmitting member 106.
6a is formed to eliminate the joint in the vicinity of the annular joint 132, so that the annular joint 132 can form a continuous annular shape. Further, the annular joint 132 can be formed linearly with the convex portion 106a of the plate-shaped driving force transmitting member. With the configuration of joining the slit 133b of the joining portion 133 by inserting the convex portion 106a,
The annular joint is not cut in the circumferential direction, and even if the voice coil bobbin 107 is inserted into the annular joint, the damper 130 does not open in the short diameter direction, so that workability can be improved and the center of the voice coil bobbin 107 can be improved. It is possible to further improve the holding performance, realize a straight and flat sound pressure frequency characteristic, and keep the minimum resonance frequency f0 low because the clamp diameter of the damper 130 can be widely secured while driving the cylindrical voice coil. To enable reproduction of low-pitched sound.

(Embodiment 10) Embodiment 1 of the present invention
0 will be described with reference to FIG. The same parts as those in the sixth or ninth embodiment are denoted by the same reference numerals, and description thereof will be omitted.

11 (a) is a plan view with a part of the diaphragm removed, FIG. 11 (b) is a side sectional view on the major axis, and FIG. 11 (c) is AA 'on the minor axis. 11 (d) is a sectional view taken along the line BB 'in FIG.

According to the figure, the difference from the sixth embodiment is that the damper supports both the cylindrical voice coil bobbin and the plate-like driving force transmitting member, and the surface rigidity of the diaphragm is improved. 101 is a diaphragm, 102 is an edge, 102 is a frame, and 103 is a frame.
The height of the diaphragm is formed shallower toward the section B-B ', the half apex angle gradually increases, and the shape is continuous with a substantially inverted mounting half conical curved surface on the long axis side. The linear slit 1
At 05, it is joined to one plate-shaped driving force transmitting member 106.

Reference numeral 107 denotes a cylindrical voice coil bobbin, in which the plate-shaped driving force transmitting member 106 is inserted and fixed in the notch 108, and the dust plate 150a is joined to the diaphragm 101. The surface to be formed is twisted, the surface rigidity of the diaphragm surface is improved, and abnormal sound due to partial resonance of the diaphragm can be prevented. Further, the damper is a cylindrical voice coil bobbin 107 continuously formed at the center. In order to suspend and support both the annular joint portion with the main body and the plate-shaped driving force transmitting member 106 in the major axis direction, it is possible to further improve the center retention.
A simple and flat sound pressure frequency characteristic can be realized, and the minimum resonance frequency f0 can be suppressed low to enable reproduction in a low sound range because a wide clamp diameter of the damper 130 can be secured. Although the dust cap is joined in the present embodiment, the technical content does not change even without the dust cap.

(Embodiment 11) Embodiment 1 of the present invention
1 will be described with reference to FIG. The same parts as those in the ninth embodiment are denoted by the same reference numerals, and description thereof will be omitted. 12 (a) is a plan view with a part of the diaphragm removed, FIG. 12 (b) is a side sectional view along the major axis, and FIG.
FIG. 12C is a sectional view taken along the line AA ′ on the minor axis, and FIG.
(D) is a sectional view taken along the line BB ′.

According to the figure, the difference from the ninth embodiment is that a magnetic circuit having an annular magnetic gap as a driving force source and two annular voice coil bobbins are provided at intervals in the long axis radial direction. It is. 101a is a diaphragm having two circular through holes, 30a and 30b are magnetic circuits having an annular magnetic gap, 107a and 107b are cylindrical voice coil bobbins, and the cylindrical voice coil bobbins 107a and 1
The plate-shaped driving force transmitting member 106 is inserted and fixed in the cutouts 108a and 108b of the 07b, and the diaphragm 101a is driven via the cylindrical voice coil bobbins 107a and 107b and the driving force transmitting member 106. This can further improve the reproduction of the mid-high range.

In each of the above embodiments, the loudspeaker has a slender track shape. However, if the loudspeaker has a rectangular shape, an oval or elliptical loudspeaker has the same effect. Of course, it is a technical category of the present invention.

Further, according to the present invention, the driving force transmitting member can be handled as a plate-shaped member, so that the conventional one using the voice coil bobbin has a large variation in the distance from the periphery of the diaphragm to the variation. It is possible to obtain a speaker having a simple and flat frequency characteristic other than the conventional cone-shaped speaker that can be suppressed, and it is possible to provide speakers of various shapes.

[0076]

As described above, the loudspeaker according to the present invention uses a plate-shaped driving force transmitting member having a voice coil portion which is coupled to the diaphragm and fitted into the magnetic gap of the magnetic circuit. This makes it possible to obtain a loudspeaker having a straight and flat sound pressure frequency characteristic by suppressing variations in the distance from the surroundings, and to provide loudspeakers of various shapes.

[Brief description of the drawings]

FIG. 1A is a top view of an embodiment of the speaker of the present invention. FIG. 1B is a side sectional view in the minor axis direction. FIG.

FIG. 2 is a perspective view of a driving force transmission member as a main part of the same.

FIG. 3 is a side sectional view of the second embodiment.

FIG. 4 is a side sectional view of the third embodiment.

FIG. 5 is a side sectional view of the fourth embodiment.

FIG. 6 is a side sectional view of the fifth embodiment.

7A is a top view of the sixth embodiment, FIG. 7B is a side sectional view in the minor axis direction, and FIG.

FIG. 8 is an exploded perspective view of the voice coil bobbin and the driving force transmitting member according to the seventh embodiment.

FIG. 9A is a top view of the eighth embodiment with a part of the diaphragm removed, FIG. 9B is a side sectional view in the same major axis direction, and FIG. ) BB 'cross-sectional view (e) C-C' cross-sectional view (f) Top view with plate-like driving force transmitting member removed

10A is a top view of the ninth embodiment with a part of the diaphragm removed, FIG. 10B is a side sectional view in the same major axis direction, and FIG. ) BB 'cross-sectional view (e) C-C' cross-sectional view (f) Top view with plate-like driving force transmitting member removed

11A is a top view of the tenth embodiment with a part of the diaphragm removed, FIG. 11B is a side sectional view in the same major axis direction, and FIG. ) B-B 'cross-sectional arrow view

12A is a top view of the eleventh embodiment with a part of the diaphragm removed, FIG. 12B is a side sectional view in the same major axis direction, and FIG. ) B-B 'cross-sectional arrow view

13A is a top view of a conventional speaker, FIG. 13B is a cross-sectional view in the same major axis direction, and FIG.

[Explanation of symbols]

1, 101, 101a Diaphragm 2, 102 Edge 3, 3a Driving force transmitting member 4 Voice coil 5 Linear magnetic gap 6 Magnetic circuit 7 Top plate 8 Magnet 9 Yoke 10 Damper 11, 103 Frame 12 Dust cap 14 Linear Magnetic gap 15 Magnetic circuit 16 Second damper 17 Second frame 18, 141 Annular magnetic gap 19, 107, 107a, 107b Cylindrical voice coil bobbin 20 Voice coil 21, 133a, 133b Slit 22 Second driving force transmitting member

Claims (20)

[Claims] 1. A magnetic circuit having at least a magnetic gap, a frame mounted on the magnetic circuit, and two sides whose outer periphery is directly or indirectly coupled to the frame and whose planar shapes viewed from the vibration direction face each other. A diaphragm having
A loudspeaker comprising a plate-shaped driving force transmitting member having a voice coil portion fitted on the substantially symmetric axis of the diaphragm and fitted into the magnetic gap. 2. A magnetic circuit having at least a magnetic gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly coupled to the frame and having a major axis and a minor axis when viewed from the vibration direction. And a plate-shaped driving force transmitting member having a voice coil portion fitted on the substantially long axis of the diaphragm and fitted in the magnetic gap. 3. A magnetic circuit having at least an annular magnetic air gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly coupled to the frame and a planar shape viewed from the vibration direction facing the frame. A diaphragm having two sides, a plate-like driving force transmitting member joined on a substantially symmetric axis of the diaphragm, and indirectly connecting the diaphragm directly and / or via the plate-like driving force transmitting member And a voice coil wound around a lower end of the cylindrical voice coil bobbin. 4. A magnetic circuit having at least an annular magnetic air gap, a frame mounted on the magnetic circuit, and an outer periphery directly or indirectly coupled to the frame, and a planar shape viewed from the vibration direction having a major axis. A diaphragm having a short diameter, a plate-like driving force transmitting member joined on a substantially major axis of the diaphragm, and indirectly connecting the diaphragm directly and / or via the plate-like driving force transmitting member And a voice coil wound around a lower end of the cylindrical voice coil bobbin. 5. A diaphragm in which a short diameter cross section is substantially V-shaped up to the vicinity of an end of a long diameter axis, and a driving force transmission member is inserted and coupled to a slit provided in a bottom bent portion serving as the substantially long diameter axis. Item 3. The speaker according to Item 2. 6. A diaphragm having an inverted V-shape in a short diameter section near a terminal end of a major axis, and a driving force transmitting member inserted and coupled to a slit provided in a top bent portion serving as the substantially major axis. The speaker according to claim 2. 7. The diaphragm has at least one circular through-hole for bonding a voice coil bobbin, and a short-diameter cross section is substantially V-shaped up to near the end of a long-diameter shaft. The speaker according to claim 3 or 4, wherein the speaker has a linear slit. 8. The diaphragm has a minor diameter section substantially V-shaped up to the vicinity of the major axis end, has a linear slit in a bent portion, and has a sectional curve from the central part of the major axis to the major axis end. 6. The half-vertical angle is gradually increased by increasing the curvature of the lens.
The speaker according to any one of claims 1 to 7. 9. The diaphragm has a V-shaped cross section having a minor axis substantially in the vicinity of the end of the major axis, has a linear slit in the bent part, and makes the bent part shallow as far as the end of the major axis. Claim 5
The speaker according to any one of claims 1 to 7. 10. The speaker according to claim 1, wherein the driving force transmitting member is a high heat resistant resin sheet such as a glass fiber composite polyamideimide resin sheet. 11. The driving force transmitting member according to claim 1, wherein the driving force transmitting member is a composite substrate using a resin sheet using a glass fiber composite polyamideimide resin or the like or a metal plate such as aluminum as a surface material or a core material. Speaker. 12. The voice coil portion of the plate-like driving force transmitting member is formed by winding a voice coil around one side of a plate-like shape, and at least a part of the voice coil is fitted into a magnetic gap of a magnetic circuit. Or the speaker according to claim 2. 13. A voice coil portion of a plate-shaped driving force transmitting member is formed by winding respective voice coils on both sides of a plate and joining them so as to be in substantially the same position and in the same current direction. 3. The speaker according to claim 1, wherein a part of the voice coil is fitted into a magnetic gap of the magnetic circuit. 14. The speaker according to claim 12, wherein the voice coil is formed on the voice coil portion by vapor deposition or printing. 15. The magnetic circuit has an annular magnetic gap, and the driving force transmitting member has a cylindrical voice coil section fitted into the magnetic gap and a plate-shaped driving force transmitting section coupled to the voice coil section. The speaker according to any one of claims 1 to 4, comprising a member main body. 16. The driving force transmitting member is connected to the voice coil portion by a cylindrical voice coil portion, a driving force transmitting member main body joining means provided on the voice coil portion, and the driving force transmitting member main body joining means. The speaker according to claim 15, comprising a plate-shaped driving force transmission member main body. 17. A corrugation having a slit into which a plate-shaped driving force transmitting member is inserted and fixed, and both sides of the slit having a waveform substantially perpendicular to the slit, and a portion deviating from the slit having a semi-concentric waveform. 3. A damper for supporting a plate-shaped driving force transmitting member, wherein the damper is formed by connecting the outer periphery to a frame.
Speaker. 18. A damper joined to a plate-shaped driving force transmitting member and a cylindrical voice coil bobbin, wherein at least one or more annular joints with the cylindrical voice coil bobbin and a major axis direction on the outside thereof. Notch provided except for, a slit into which a plate-shaped driving force transmitting member is inserted and fixed, a waveform formed by repeating at least one convex or concave parallel to the slit on both sides, and a frame. 5. The loudspeaker according to claim 3, further comprising a damper formed from an outer peripheral joint portion coupled to the loudspeaker. 19. The damper has an annular joint with a cylindrical voice coil bobbin, and a linear joint with a slit into which a plate-shaped driving force transmitting member is inserted and fixed in the major axis direction.
A waveform parallel to the linear joint in the waveform forming portion;
19. The loudspeaker according to claim 18, wherein a semi-concentric waveform connected thereto is formed. 20. The damper has an annular joint with a cylindrical voice coil bobbin, and a linear joint with a slit in which a plate-shaped driving force transmitting member is partially inserted and fixed in the major axis direction. The speaker according to claim 18, wherein the speaker is provided at a distance from the annular joint.