JP3972505B2 - Speaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a speaker used for various audio equipment.
[0002]
[Prior art]
In recent years, the demand for space-saving, high-performance, and high-design of various audio equipment has been screamed, and there is a demand for a slender speaker with higher performance.
[0003]
A conventional elongated speaker will be described with reference to FIGS.
[0004]
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 the main part.
[0005]
According to the figure, 1 is a bottom plate provided with a center pole, 2 is a ring-shaped main magnet fixed to the bottom plate 1, and 3 is a top plate fixed to the upper surface of the magnet 2. Reference numeral 4 denotes a frame coupled to a circular magnetic circuit formed by the bottom plate 1, the ring-shaped main magnet 2 and the top plate 3. Reference numeral 5 denotes a ring-shaped cancel magnet which is magnetized and fixed on the lower surface of the bottom plate 1 in the opposite direction to the main magnet 2, and 6 is a shield cover which covers the entire circular magnetic circuit.
[0006]
Reference numeral 7 denotes a circular voice coil held in a magnetic gap formed by the inner periphery of the top plate 3 and the outer peripheral surface of the center pole of the bottom plate 1, and 8 indicates an inner peripheral frame 11 attached to the circular voice coil 7. A circular damper in which the outer peripheral frame 12 is fixed to the frame 4 is fixed, and an inner periphery is fixed to the tip of the voice coil 7, and an outer diameter is fixed to the upper part of the frame 4. It is also an asymmetrical elliptical diaphragm. In addition, 10 is a dust cap stuck on the center upper surface of the diaphragm 9.
[0007]
The operation of the conventional speaker configured as described above will be described below.
[0008]
First, when an electrical 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 supported by the damper 8, vibrates the elliptical diaphragm 9 fixed to the tip thereof, and emits sound corresponding to the vibration.
[0009]
Further, in order to reduce the magnetic influence on the outside, the magnetism is blocked by the cancel magnet 5 and the shield cover 6 to prevent magnetic leakage.
[0010]
[Problems to be solved by the invention]
However, in the elliptical speaker having the conventional configuration described above, when the applied input increases, the load on the damper 8 that supports the voice coil 7 that transmits the driving force increases, and the elliptical shape whose outer periphery is fixed to the frame 4 is also increased. The amplitude and the load of the diaphragm 9 having a large shape also increase, but the shape of the voice coil 7 that transmits the driving force at that time is circular, and the damper 8 that supports the circular voice coil 7 is also circular. For this reason, since the shape of the outer periphery of the diaphragm 9 that radiates sound is different from the shape of the ellipse, the way the driving force is transmitted in the minor axis direction and the major axis direction of the diaphragm 9 is different, resulting in distortion in the amplitude. It was a factor that caused the generation of harmonic distortion and disturbance of frequency characteristics. Therefore, it is difficult to improve the input resistance and to reduce the distortion, and the usage is greatly restricted.
[0011]
The present invention solves the above-mentioned problems, and has excellent acoustic performance that can ensure low distortion and a sufficient output sound pressure level in an elongated speaker having a different ratio of major axis to minor axis, such as an elliptical type or a track type. An object of the present invention is to provide a provided speaker.
[0012]
[Means for Solving the Problems]
In order to solve the above-described problems, a speaker according to the present invention includes at least a magnetic circuit, a frame having upper and lower diameter upper surfaces coupled to the magnetic circuit, and an elongated voice fitted into the magnetic gap of the magnetic circuit. A coil, an elongated inner peripheral frame coupled to the voice coil, an elongated outer peripheral frame whose outer periphery is coupled to the frame, a damper having a movable arm that bridges the inner peripheral frame and the outer peripheral frame, It is composed of an elliptical diaphragm whose periphery is connected to the voice coil and whose outer periphery is connected to the frame. The voice coil and the damper are also elongated, and the damper is bridged between the inner peripheral frame and the outer peripheral frame. By forming it with a movable 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 a sufficient output sound pressure level is achieved. It is excellent and makes it possible to provide a speaker having an acoustic performance. Furthermore, the movable arm of the damper is formed by a plurality of slits provided at least approximately parallel to the major axis direction, and the movable arm can be formed efficiently.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, there is provided at least a magnetic circuit, a frame having upper and lower diameters coupled to the magnetic circuit, and an elongated voice coil fitted into a magnetic gap of the magnetic circuit. An elongated inner peripheral frame coupled to the voice coil, an elongated outer peripheral frame whose outer periphery is coupled to the frame, a damper having a movable arm that bridges the inner peripheral frame and the outer peripheral frame, and an inner circumference Is composed of an elliptical diaphragm that is coupled to a voice coil and whose outer periphery is coupled to a frame. The voice coil and the damper are also elongated, and the damper is bridged between the inner and outer frames. By forming the movable arm with a movable 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 to obtain a sufficient output sound pressure level. Together and provides a chromatography mosquitoes, which are formed by a plurality of slits provided substantially parallel to the movable arm provided with the damper in at least the major axis direction, in which the movable arm can be efficiently formed .
[0014]
According to a second aspect of the present invention, a notch that is not coupled to the voice coil is provided at a corner portion of the inner peripheral frame of the damper according to the first aspect, and stress absorption at the time of amplitude and the voice coil are provided. The present invention makes it possible to provide a speaker with excellent performance that can alleviate dimensional variations during assembly.
[0015]
According to a third aspect of the present invention, the substantially central portion on the short diameter side of the inner peripheral frame of the damper according to the first aspect is thinned, and the flexibility in the rolling direction is improved to improve the voice coil. The load due to rolling is absorbed to prevent deformation of the voice coil.
[0020]
The invention according to claim 4 of the present invention is such that the damper of the speaker according to claim 1 is formed of a thin metal plate, and the slit is provided by shearing, and the gap of the slit is extremely small by shearing. As a thing, it has the effect of a dustproof effect to a magnetic circuit etc.
[0022]
An embodiment of a speaker according to the present invention will be described below with reference to FIGS.
[0023]
In the description, the same part number is assigned to the same part as in the prior art, and the description is omitted.
[0024]
(Embodiment 1)
FIG. 1 is an exploded perspective view of an elliptical speaker according to an embodiment of an elongated speaker of the present invention, and FIG. 2 is a plan view of a damper which is the main part. Only the differences between the present invention and the prior art will be described with reference to the same drawing. Reference numeral 13 denotes a non-circular (rectangular) bottom plate (the center pole is a non-circular (rectangular) column), and 14 is a non-circular (rectangular) inner periphery. Reference numeral 15 denotes a frame connected to a magnetic circuit formed by the bottom plate 13, the ring-shaped main magnet 2, and the top plate 14.
[0025]
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 a non-circular (rectangular) voice coil. An outer frame with an inner peripheral frame fixed to the coil 16 and an outer periphery fixed to the frame 15 is also a non-circular (rectangular) damper, and 18 is an inner periphery fixed to the tip of the voice coil 16 and the outer periphery is an upper portion of the frame 15. As in the case of the frame 15, the major axis and the minor axis fixed to each other are asymmetrical elliptical diaphragms. Reference numeral 19 denotes a dust cap attached to the central upper surface of the diaphragm 18.
[0026]
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 (rectangular) frame. A plurality of movable arms bridged between the inner peripheral frame 20 and the non-circular (rectangular) outer peripheral frame 21.
[0027]
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, with a plurality of slits 22a provided therebetween. The movable arm 22 is formed, the central portion of the inner peripheral frame 20 is thinned to improve the flexibility in the rolling direction, and the diaphragm 18 that has been generated when the inner peripheral frame 20 has been formed in a circular shape until now is formed. The distortion due to the difference in shape can be suppressed, and the movable arm 22 can be freely formed regardless of the restriction of the inner peripheral frame 20, so that the degree of freedom in design can be improved, and the major axis and minor axis of an elliptical type or a track type A speaker with excellent acoustic performance in a slim and compact shape with a low distortion and a sufficient output sound pressure level, even in the narrow space of the narrow type with different ratio and the aperture size of the speaker Can also provide It is.
[0028]
In the above embodiment, the shape of the voice coil 16, the bottom plate 13, the damper 17 and the like is non-circular (rectangular). However, any shape may be used as long as it is an elongated shape, and the same applies to the following embodiments. .
[0029]
(Embodiment 2)
Another embodiment of the speaker of the present invention will be described with reference to FIG.
[0030]
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 same drawing. Reference numeral 23 denotes a linear portion of two sides of a non-circular (substantially rectangular) outer peripheral frame of the damper 17.
[0031]
In the present embodiment, positioning and positioning when the damper 17 is attached 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 the major axis and minor axis It is possible to easily reduce gap defects due to sticking misalignment during assembly, which is a problem with speakers having different ratios.
[0032]
(Embodiment 3)
Another embodiment of the speaker of the present invention will be described with reference to FIG.
[0033]
FIG. 4 is a plan view of a damper of a speaker 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 same drawing. Reference numeral 24 denotes a linear portion on two sides of the non-circular (substantially rectangular) inner frame 20 of the damper 17, and 25 denotes the damper 17. It is a straight part of two sides of the non-circular (substantially rectangular) outer peripheral frame 21.
[0034]
In the present embodiment, by providing the linear portion 24 also on the inner peripheral frame 20, positioning at the time of insertion of the voice coil 16 into the magnetic gap is facilitated, and the shape of each component also has a linear portion. Machining accuracy can be easily improved, variation in each part during speaker assembly can be suppressed, and positioning and positioning when the damper 17 is attached to the frame 15 by the linear portion 25 of the outer peripheral frame 21 can be performed. It is easy to easily reduce the gap defect caused by any of the speaker assembling.
[0035]
(Embodiment 4)
Another embodiment of the speaker of the present invention will be described with reference to FIG.
[0036]
FIG. 5 is a plan view of a damper of a speaker 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 a linear portion of four sides of the non-circular (rectangular) outer peripheral frame 21 of the damper 17.
[0037]
In the present embodiment, by making the four sides of the outer peripheral frame 21 straight, the guide property when the damper 17 is combined can be further improved by both guides in the major axis and minor axis directions.
[0038]
(Embodiment 5)
Another embodiment of the speaker of the present invention will be described with reference to FIG.
[0039]
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 same drawing. Reference numeral 27 denotes a linear portion of four sides of the non-circular (rectangular) inner peripheral frame 20 of the damper 17, and reference numeral 28 denotes a non-circular portion of the damper 17. It is a straight portion of four sides of a circular (rectangular) outer peripheral frame 21.
[0040]
In the present embodiment, since the inner peripheral frame 20 and the outer peripheral frame 21 of the damper 17 have four straight portions 27 and 28, respectively, the effective amplitude area of the damper 17 can be utilized to the maximum, It is possible to improve the design freedom of the movable arm 22 and to enable a large amplitude.
[0041]
(Embodiment 6)
Another embodiment of the speaker of the present invention will be described with reference to FIGS.
[0042]
Fig.7 (a) is a top view of the damper of the speaker of other embodiment of this invention. Only the differences between the first embodiment and the present embodiment will be described with reference to the same drawing. 29 is a movable arm formed by bending a slit 29a extending in the major axis direction into an L shape on the major axis side in the minor axis direction, The movable arm 29 is combined with the outer peripheral frame 21 on the short diameter side at a position away from the outer peripheral frame 21 and the center in the long diameter direction to increase the combined area in the short diameter direction.
[0043]
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 shaking at the time of the amplitude, and generating an abnormal sound. Can be suppressed.
[0044]
7 (b) is an exploded perspective view of the damper of the embodiment of FIG. 7 (a), in which the damper of FIG. 7 (a) is formed from a thin metal plate. It is a damper that uses elasticity. 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 adhesively bonded. Since the damper 17 made of a thin metal plate is connected to the voice coil 16 by a line connection, the reinforcing wire 20a is used as a connection surface by the reinforcing frame 20a to improve the connection reliability.
[0045]
This reinforcing frame 20a can be applied not only to the above-described sixth embodiment, but also when the dampers 17 of the first to fifth and seventh embodiments are formed of a thin metal plate, and the same effect as the present embodiment can be obtained. It is what you have.
[0046]
(Embodiment 7)
Another embodiment of the speaker of the present invention will be described with reference to FIG.
[0047]
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 same drawing. Reference numeral 30 denotes a circular notch provided at the corners of the four sides of the inner peripheral frame 20 of the damper 17 so as not to contact the voice coil 16. It is.
[0048]
This notch 30 can absorb the distortion due to thermal deformation of the voice coil 16 at the time of amplitude, and can also reduce the dimensional variation when assembling the voice coil.
[0049]
When the damper 17 is formed of a thin metal plate, a circular notch 30 provided at the corner 30 or slit end of the inner peripheral frame 20 is previously provided by punching or the like before forming the inner peripheral frame 20 or slit. Cracks due to aging etc. occurring at these corners can be prevented.
[0050]
It should be noted that the damper 17 is made of resin and is integrally formed, so that the damper 17 can be further thinned and a slim and thin shape can be formed.
[0051]
Moreover, the thing by a metal thin plate can maintain the performance with the very little performance degradation which can also endure a secular change.
[0052]
In each of the above embodiments, an elliptical speaker has been described as an example. However, any elliptical speaker, rectangular shape, rectangular shape, or other elongated speaker having a different ratio of major axis to minor axis may be used. The same effect can be obtained.
[0053]
When the damper 17 is formed of a thin metal plate in each of the above embodiments, when the slit for forming each movable arm is formed by shearing, the gap between the slits can be made extremely small. It also has the effect of suppressing the entry of dust into the interior.
[0054]
【The invention's effect】
As described above, the speaker of the present invention includes at least a magnetic circuit, a frame having upper and lower diameters coupled to the magnetic circuit, an elongated voice coil fitted into the magnetic gap of the magnetic circuit, An elongated inner peripheral frame coupled to the voice coil, an elongated outer peripheral frame whose outer periphery is coupled to the frame, a damper having a movable arm that bridges the inner peripheral frame and the outer peripheral frame, and a voice on the inner periphery The coil is composed of an elliptical diaphragm whose outer periphery is coupled to a 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 that bridges both of them. Excellent acoustic characteristics that suppress the difference between the major axis direction and minor axis direction of the driving force transmitted by the voice coil to reduce distortion and obtain a sufficient output sound pressure level Together and makes it possible to provide a loudspeaker with is obtained by forming the movable arm by a plurality of slits, in which can efficiently form the movable arm.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of an elliptical speaker according to an embodiment of the speaker of the present invention. FIG. 2 is a plan view of a damper which is the main part of the speaker. 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 another embodiment of the speaker according to 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. FIG. 7A is a damper of another embodiment which is a main part of the speaker of the present invention. FIG. 8B is an exploded perspective view of a damper, which is a main part for explaining a reinforcing plate used when the damper of FIG. 7A is formed of a thin metal plate. FIG. 8 is a main part of the speaker of the present invention. FIG. 9 is a plan view of a damper according to another embodiment of the present invention. Plan view of the damper is a perspective view [10] the main part [Description of symbols]
2 Magnet 13 Bottom plate 14 Top plate 15 Frame 16 Voice coil 17 Damper 18 Diaphragm 20 Inner frame 20a Reinforcement frame 21 Outer frame 22 Movable arm 22a Slits 23, 25, 26, 28 Linear portions 24, 27 (outer frame) Straight part 29 (inner peripheral frame) movable arm 29a slit 30 notch

Claims (4)

At least a magnetic circuit, a frame having upper and lower diameters coupled to the magnetic circuit, an elongated voice coil fitted into the magnetic gap of the magnetic circuit, and an elongated voice coil coupled to the voice coil An elongated outer frame whose outer peripheral frame and outer periphery are coupled to the frame, a damper having a movable arm that bridges the inner peripheral frame and the outer peripheral frame, an inner periphery is coupled to a voice coil, and an outer periphery is coupled to the frame A speaker comprising an elliptical diaphragm, wherein the movable arm provided on the damper is formed by a plurality of slits provided at least substantially parallel to the major axis direction .   The speaker according to claim 1, wherein a notch that is not coupled to the voice coil is provided at a corner of the inner peripheral frame of the damper.   The speaker according to claim 1, wherein a substantially central portion on the short diameter side of the inner peripheral frame of the damper is thinned. The speaker according to claim 1 , wherein the damper is formed of a thin metal plate, and the slit is provided by shearing.

Images