JP2000244997A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a loudspeaker with an excellent acoustic characteristic with respect to the thin and long loudspeaker applied to various electroacoustic transducers. SOLUTION: This loudspeaker consists at least of a magnetic circuit, a frame 15 that is coupled with this magnetic circuit and whose upper face has a minor diameter and a major diameter, a thin and long voice coil 16 that is inserted to a magnetic gap of the magnetic circuit, an inner circumferential frame 20 coupled with the voice coil 16, a thin and long outer circumferential frame 21 whose outer circumference is connected to the frame 15, a damper 17 having a movable arm 22 bridging over the inner circuit frame 20 and the outer circumferential frame 21, and a diaphragm 18 whose inner circumference is connected to the voice coil 16 and whose outer circumference is connected to the frame 15. The loudspeaker with excellent sound performance realized by low distortion and a sufficient output sound pressure level can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used for various kinds of audio equipment.

[0002]

2. Description of the Related Art In recent years, with the demand for space-saving, high performance, and high design of various audio devices, a slender speaker having higher performance has been demanded as a speaker.

A conventional elongated speaker will be described with reference to FIGS. 9 and 10. FIG.

FIG. 9 is an exploded perspective view of an elliptical speaker which is an elongated speaker, and FIG. 10 is a plan view of a damper which is a main part of the speaker.

According to FIG. 1, reference numeral 1 denotes a bottom plate having a center pole, 2 denotes a ring-shaped main magnet fixed to the bottom plate 1, and 3 denotes a top plate fixed to the upper surface of the magnet 2. 4 is a bottom plate 1 and a ring-shaped main magnet 2
And a frame coupled to a circular magnetic circuit formed by the top plate 3. Reference numeral 5 denotes a ring-shaped cancel magnet which is magnetized and fixed to the lower surface of the bottom plate 1 in a direction opposite to that of the main magnet 2, and 6 is a shield cover which covers the entire circular magnetic circuit.

Reference numeral 7 denotes a circular voice coil held in a magnetic gap formed by an inner periphery of the top plate 3 and an outer peripheral surface of the center pole of the bottom plate 1. Reference numeral 8 denotes an inner periphery of the circular voice coil 7. 9 is a circular damper in which the frame 11 is fixed and the outer peripheral frame 12 is fixed to the frame 4.
Is an elliptical diaphragm having a major axis and a minor axis asymmetrically similar to the frame 4 with the inner periphery fixed to the tip of the voice coil 7 and the outer periphery fixed to the upper portion of the frame 4. Reference numeral 10 denotes a dust cap attached to the upper surface of the center of the diaphragm 9.

The operation of the conventional speaker configured as described above will be described below.

First, when an electric signal is applied to the voice coil 7, a driving force is generated in the magnetic circuit. This driving force is transmitted from the voice coil 7 while being supported by the damper 8, and vibrates the elliptical diaphragm 9 fixed to the tip of the damper 8, and emits a sound corresponding to the vibration.

In order to further reduce the magnetic influence to the outside, the magnetism is shut off by the cancel magnet 5 and the shield cover 6 to prevent magnetic leakage.

[0010]

However, in the above-mentioned elliptical loudspeaker having the conventional configuration, as the applied input increases, the load on the damper 8 supporting the voice coil 7 for transmitting the driving force increases. The amplitude and load of the elliptical diaphragm 9 whose outer periphery is fixed to the frame 4 also increase, but the voice coil 7 that transmits the driving force at that time has a circular shape, and the circular voice coil 7
Since the damper 8 supporting the diaphragm 9 also has a circular shape, the shape of the outer periphery of the diaphragm 9 that emits sound is different from that of the ellipse, so that the driving force is transmitted to the diaphragm 9 in the minor axis direction and the major axis direction. As a result, the amplitude is distorted, which causes harmonic distortion and disturbances in frequency characteristics. Therefore, it is difficult to improve the input resistance and to reduce the distortion, which greatly imposes restrictions on the intended use.

The present invention has been made to solve the above problems, and
It is an object of the present invention to provide a speaker having excellent acoustic performance capable of reducing distortion and securing a sufficient output sound pressure level in an elongated speaker such as an elliptical type or a track type having a different ratio between a major axis and a minor axis. It is.

[0012]

In order to solve the above-mentioned problems, a speaker according to the present invention comprises at least a magnetic circuit, a frame having an upper surface connected to the magnetic circuit and having a major axis and a minor axis, and a magnetic circuit of the magnetic circuit. An elongated voice coil fitted in the gap, an elongated inner peripheral frame connected to the voice coil, and an elongated outer frame joined to the outer peripheral frame, the inner peripheral frame and the outer peripheral frame are bridged. A damper having a movable arm, and an elliptical diaphragm whose inner periphery is coupled to the voice coil and whose outer periphery is coupled to the frame,
The voice coil and the damper are also elongated, and the damper is formed by an inner peripheral frame, an outer peripheral frame, and a movable arm bridging the both, so that the driving force transmitted by the voice coil depends on the major axis direction and the minor axis direction. An object of the present invention is to provide a speaker having excellent acoustic performance capable of suppressing a difference to reduce distortion and obtaining a sufficient output sound pressure level.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that at least a magnetic circuit, a frame having an upper surface connected to the magnetic circuit and having a major axis and a minor axis, and a magnetic gap of the magnetic circuit. Elongated voice coil,
An elongated inner peripheral frame connected to the voice coil and an elongated outer peripheral frame whose outer periphery is coupled to the frame, a damper having a movable arm bridging the inner peripheral frame and the outer peripheral frame, and an inner peripheral voice A movable arm that is formed of an elliptical diaphragm that is coupled to a coil and whose outer periphery is coupled to a frame, the voice coil and the damper are also elongated, and the damper is an inner peripheral frame and an outer peripheral frame, and a movable arm that bridges the two. The present invention provides a speaker that suppresses a difference between the major axis direction and the minor axis direction of the driving force transmitted by the voice coil to reduce distortion and obtain a sufficient output sound pressure level.

According to a second aspect of the present invention, a notch which is not connected to a voice coil is provided at a corner of an inner peripheral frame of the damper according to the first aspect of the present invention to absorb stress during amplitude. And a speaker having excellent performance that can reduce dimensional variations at the time of assembling the voice coil.

According to a third aspect of the present invention, the substantially central portion on the minor diameter side of the inner peripheral frame of the damper according to the first aspect is narrowed, and the flexibility in the rolling direction is improved. The purpose of the present invention is to prevent the deformation of the voice coil by absorbing the load caused by the rolling of the voice coil.

According to a fourth aspect of the present invention, there is provided an elongated damper according to the first aspect, wherein straight lines are provided on two opposing sides constituting an outer peripheral frame and / or an inner peripheral frame. In the case where a straight portion is provided on two opposing sides of the outer peripheral frame, positioning and positioning when attaching a damper to the frame are facilitated, and straight portions are provided on two opposing sides of the inner peripheral frame. Is provided, it is possible to easily position the voice coil at the time of insertion into the magnetic gap, and to provide an excellent speaker with reduced assembly failure. .

According to a fifth aspect of the present invention, at least two opposing sides constituting the outer peripheral frame and the inner peripheral frame of the damper are provided with linear portions. By making the four sides straight, it is possible to provide an excellent speaker capable of maximizing the amplitude effective area of the damper and capable of large amplitude.

According to a sixth aspect of the present invention, at least the damper according to the first aspect has a movable arm connected to the short diameter side of the outer peripheral frame near the end in the long diameter direction. Yes, the voice coil is supported in the short diameter direction on the long diameter side, which improves flexibility and also suppresses side-to-side movement of the voice coil at the time of amplitude, providing an excellent speaker with improved input resistance and less occurrence of abnormal noise. Is made possible.

According to a seventh aspect of the present invention, the movable arm provided on the damper according to the first or sixth aspect is formed by a plurality of slits provided at least substantially in parallel to the major axis direction. Thus, a plurality of movable arms can be efficiently formed.

According to an eighth aspect of the present invention, the damper of the loudspeaker according to the seventh aspect is formed of a thin metal plate and the slit is provided by shearing, and the gap of the slit is formed by shearing. It has an extremely small dust-proof effect on a magnetic circuit or the like.

In a ninth aspect of the present invention, the damper of the loudspeaker according to any one of the first to seventh aspects is formed of a thin metal plate, and has an inner periphery substantially the same shape as the inner peripheral frame, and is provided inside the voice coil. The reinforcing frame, which is coupled with the peripheral frame, is fixed to the inner peripheral frame. The reinforcing frame can improve the strength of the coupling with the voice coil and the reliability.

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

In the description, the same parts as those of the prior art are given the same part numbers, and the description is omitted.

(Embodiment 1) FIG. 1 is an exploded perspective view of an elliptical speaker according to an embodiment of the elongated speaker of the present invention, and FIG. 2 is a plan view of a damper which is a main part of the speaker.
Only the differences between the present invention and the prior art will be described with reference to FIG. Reference numeral 15 denotes a frame coupled to a magnetic circuit formed by the bottom plate 13, the ring-shaped main magnet 2 and the top plate 14.

Reference numeral 16 denotes a non-circular (rectangular) voice coil held in a magnetic gap formed by the inner periphery of the top plate 14 and the outer peripheral surface of the center pole of the bottom plate 13. Reference numeral 17 denotes this non-circular (rectangular) voice coil. ) Voice coil 1
An outer frame having an inner peripheral frame fixed to the frame 6 and an outer periphery fixed to the frame 15 is also a non-circular (rectangular) damper.
5 is an asymmetric diaphragm having a major axis and a minor axis that are asymmetrical to the frame 15 and that are fixed to the upper part of the diaphragm 5. Reference numeral 19 denotes a dust cap attached to the center upper surface of the diaphragm 18.

2 is a non-circular (rectangular) inner peripheral frame of the damper 17, 21 is a non-circular (rectangular) outer peripheral frame of the damper 17 coupled to the frame 15, and 22 is the non-circular. There are a plurality of movable arms bridged between a (rectangular) inner peripheral frame 20 and a non-circular (rectangular) outer peripheral frame 21.

In the present embodiment, the inner peripheral frame of the damper 17 is an elongated non-circular inner peripheral frame 20, and the outer peripheral frame is also an elongated non-circular outer peripheral frame 21, and a slit 22a is provided therebetween. To form a plurality of movable arms 22 to narrow the substantially central portion of the inner peripheral frame 20 to improve the flexibility in the rolling direction. Distortion due to the difference from the shape of the plate 18 can be suppressed, and the movable arm 22 can be freely formed irrespective of the regulation of the inner peripheral frame 20, so that the degree of freedom in design can be improved, and the long diameter of an elliptical type, a track type, etc. Even in the limited space of the slender type and the diameter of the speaker, the ratio of which is different from the short diameter, the distortion can be reduced and a sufficient output sound pressure level can be obtained, and excellent acoustic performance in a slim and compact shape. Speaker It is what you can do today.

In the above embodiment, the shape of the voice coil 16, the bottom plate 13, the damper 17 and the like is made non-circular (rectangular). However, the shape is not limited as long as it is elongated. The same is true.

(Embodiment 2) Another embodiment of the speaker of the present invention will be described with reference to FIG.

FIG. 3 is a plan view of a damper of a speaker according to another embodiment of the present invention. Only the differences between the first embodiment and the present embodiment will be described with reference to the figure. Reference numeral 23 denotes a straight portion on two sides of a non-circular (substantially rectangular) outer peripheral frame of the damper 17.

In the present embodiment, the positioning and positioning of the damper 17 when attaching the damper 17 to the frame 15 are facilitated, and the straight portion 23 of the non-circular (substantially rectangular) outer peripheral frame 21 serves as a guide, and has a long diameter. It is possible to easily reduce a gap defect due to a displacement at the time of assembling, which is a problem in speakers having different minor axis ratios.

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

FIG. 4 is a plan view of a speaker damper according to another embodiment of the present invention. Only the differences between the second embodiment and the present embodiment will be described with reference to the figure. Reference numeral 24 denotes a linear portion on two sides of a non-circular (substantially rectangular) inner peripheral frame 20 of the damper 17, and reference numeral 25 denotes a damper 17. These are straight portions on two sides of a non-circular (substantially rectangular) outer peripheral frame 21.

In the present embodiment, the linear portion 24 is also provided on the inner peripheral frame 20 to facilitate the positioning of the voice coil 16 when it is inserted into the magnetic gap, and each component has a linear portion. As a result, the processing accuracy can be easily improved, the variation of each part at the time of assembling the speaker can be suppressed, and the linear portion 25 of the outer peripheral frame 21 can be further reduced.
Thus, the positioning and positioning of the damper 17 when attaching the damper 17 to the frame 15 can be facilitated, and the gap failure due to any of the speaker assembly can be easily reduced.

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

FIG. 5 is a plan view of a speaker damper according to another embodiment of the present invention. Only the differences between the third embodiment and the present embodiment will be described with reference to the same drawing. Reference numeral 26 denotes straight portions on four sides of a non-circular (rectangular) outer peripheral frame 21 of the damper 17.

In the present embodiment, the outer frame 21
By making the sides straight, guideability when the damper 17 is combined can be further improved by both the major axis and minor axis directions.

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

FIG. 6 is a plan view of a damper of a speaker according to another embodiment of the present invention. Only the differences between the fourth embodiment and the present embodiment will be described with reference to the figure. Reference numeral 27 denotes a straight portion on four sides of a non-circular (rectangular) inner peripheral frame 20 of the damper 17, and reference numeral 28 denotes a non-circular portion of the damper 17. Circular (rectangular) outer frame 2
1 is a linear portion of four sides.

In the present embodiment, the inner peripheral frame 20 and the outer peripheral frame 21 of the damper 17 each have linear portions 27 and 28 each having four sides.
, The effective amplitude area of the damper 17 can be maximized, and the amplitude area can be improved and the movable arm 2 can be used.
In this case, the degree of freedom of design can be improved, and a large amplitude can be obtained.

(Embodiment 6) Another embodiment of the speaker of the present invention will be described with reference to FIGS. 7 (a) and 7 (b).

FIG. 7A is a plan view of a speaker damper according to another embodiment of the present invention. Only the differences between the first embodiment and the present embodiment will be described with reference to the figure. Reference numeral 29 denotes a movable arm formed by bending a slit 29a extending in the major axis direction into an L-shape in the minor axis direction on the major axis side. The movable arm 29 is connected to the outer peripheral frame 21 on the minor diameter side at a position away from the center of the outer peripheral frame 21 in the major diameter direction to increase the coupling area in the minor diameter direction.

For this reason, the damper 17 can obtain a sufficient amplitude by separating the coupling with the outer peripheral frame 21 from the central portion, thereby improving the input resistance and suppressing the lateral displacement at the time of the amplitude. The occurrence of abnormal sound can be suppressed.

FIG. 7B is an exploded perspective view of a damper in a developed example of the embodiment of FIG. 7A, and FIG.
Is formed of a thin metal plate, and is a damper utilizing the elasticity of the thin metal plate. Reference numeral 20a denotes a reinforcing frame made of a thin metal plate whose inner diameter substantially matches the inner peripheral frame 20, and is bonded and bonded. Since the damper 17 made of a thin metal plate is connected to the voice coil 16 by wire connection, the connection line is used as a connection surface by the reinforcing frame 20a to improve the reliability of the connection.

This reinforcing frame 20a is applicable not only to the sixth embodiment but also to the case where the dampers 17 of the first to fifth and seventh embodiments are formed of a thin metal plate.
This has the same effect as the present embodiment.

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

FIG. 8 is a plan view of a damper of a speaker according to another embodiment of the present invention. Only the differences between the sixth embodiment and the present embodiment will be described with reference to the figure. Reference numeral 30 denotes a circular cutout provided at the four corners of the inner peripheral frame 20 of the damper 17 and not in contact with the voice coil 16. It is.

The notch 30 can absorb the distortion due to the thermal deformation of the voice coil 16 at the time of the amplitude, and can reduce the dimensional variation at the time of assembling the voice coil.

When the damper 17 is formed of a thin metal plate, the circular cutout 30 provided at the corner 30 or the slit end of the inner peripheral frame 20 is previously punched before forming the inner peripheral frame 20 or the slit. By providing them, cracks due to aging or the like occurring at these corners can be prevented.

By forming the material of the damper 17 by resin molding and integrally forming the same, the thickness of the damper 17 can be further reduced, and a slim and thin shape can be formed.

In the case of a thin metal plate, it is possible to maintain the performance with very little deterioration in performance that can withstand aging.

In each of the above embodiments, an elliptical speaker has been described as an example. However, in the case of an elongated speaker such as an elliptical type, a rectangular type, a rectangular type, and the like, the ratio of the major axis to the minor axis is different. It can be applied to any of them, and a similar effect can be obtained.

In each of the above embodiments, the damper 17
When the slits for forming each movable arm are formed by shearing when formed from a thin metal plate, the interval between the slits can be made very small, so that entry of dust from the damper 17 into the magnetic circuit is suppressed. It also has an effect.

[0054]

As described above, the loudspeaker according to the present invention comprises at least a magnetic circuit, a frame having an upper surface connected to the magnetic circuit and having a major axis and a minor axis, and an elongated type fitted into a magnetic gap of the magnetic circuit. A voice coil, a damper having a slender inner peripheral frame coupled to the voice coil and a slender outer peripheral frame whose outer periphery is coupled to the frame, and a movable arm bridging the inner peripheral frame and the outer peripheral frame; The inner periphery is composed of a voice coil and an elliptical diaphragm whose outer periphery is joined to a frame. The voice coil and the damper are also slender, and the damper is movable to bridge the inner and outer frames. By forming the arm, the difference between the major axis direction and the minor axis direction of the driving force transmitted by the voice coil is suppressed to reduce distortion and obtain a sufficient output sound pressure level. And it makes it possible to provide a speaker having an acoustic performance that was.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an elliptical speaker according to an embodiment of the present invention.

FIG. 2 is a plan view of a damper which is a main part of the same.

FIG. 3 is a plan view of a damper as a main part of another embodiment of the speaker of the present invention.

FIG. 4 is a plan view of a damper according to another embodiment, which is a main part of the speaker of the present invention.

FIG. 5 is a plan view of a damper according to another embodiment, which is a main part of the speaker of the present invention.

FIG. 6 is a plan view of a damper according to another embodiment, which is a main part of the speaker of the present invention.

7A is a plan view of a damper according to another embodiment, which is a main part of the speaker of the present invention. FIG. 7B illustrates a reinforcing plate used when the damper of FIG. 7A is formed of a thin metal plate. Exploded perspective view of a damper as a main part for performing

FIG. 8 is a plan view of a damper according to another embodiment, which is a main part of the speaker of the present invention.

FIG. 9 is an exploded perspective view of a conventional elliptical speaker.

FIG. 10 is a plan view of a damper as the main part.

[Explanation of symbols]

 2 Magnet 13 Bottom plate 14 Top plate 15 Frame 16 Voice coil 17 Damper 18 Vibrating plate 20 Inner peripheral frame 20a Reinforcement frame 21 Outer peripheral frame 22 Movable arm 22a Slits 23, 25, 26, 28 Linear parts 24, 27 (of outer peripheral frame) Straight part (of inner peripheral frame) 29 Movable arm 29a Slit 30 Notch

Claims (9)

[Claims] At least a magnetic circuit, a frame having an upper surface connected to the magnetic circuit and having a major axis and a minor axis, an elongated voice coil fitted in a magnetic gap of the magnetic circuit, and a coupling to the voice coil And a damper having a movable outer arm that bridges between the inner peripheral frame and the outer peripheral frame, the outer peripheral frame being connected to the voice coil. And an elliptical diaphragm coupled to the frame. 2. The loudspeaker according to claim 1, wherein a notch that is not connected to the voice coil is provided at a corner of the inner peripheral frame of the damper. 3. The loudspeaker according to claim 1, wherein a substantially central portion on the minor diameter side of the inner peripheral frame of the damper is narrowed. 4. The loudspeaker according to claim 1, wherein linear portions are provided on at least two opposing sides constituting an outer peripheral frame and / or an inner peripheral frame of the damper. 5. The loudspeaker according to claim 1, wherein linear portions are provided at least on each of two opposing sides constituting an outer peripheral frame and an inner peripheral frame of the damper. 6. The loudspeaker according to claim 1, wherein at least the damper has a movable arm connected to a short diameter side of the outer peripheral frame near an end in the long diameter direction. 7. The loudspeaker according to claim 1, wherein the movable arm provided on the damper is formed by a plurality of slits provided at least substantially in parallel to the major axis direction. 8. The speaker according to claim 7, wherein the damper is formed of a thin metal plate, and the slit is provided by shearing. 9. The damper is formed of a thin metal plate,
2. A reinforcing frame having an inner periphery substantially identical in shape to the inner peripheral frame and fixed to the voice coil together with the inner peripheral frame is fixed to the inner peripheral frame.
The speaker according to claim 7.