JPH09284886A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a speaker with excellent reproduction frequency characteristic and directivity in which deterioration in the characteristic is prevented by forming the shape of a diaphragm to be asymmetrical and the speaker is devised to be produced by a conventional production facility and a conventional production method. SOLUTION: A voice coil 2 is attached to a frame 5 whose outer circumference is formed circular with symmetry with respect to an axial center and to which a magnetic circuit 4 having a torus magnetic void is fitted coaxially on the apex 1a of an eccentric cone type diaphragm 1 whose each generating line length differs from each other. Also, a vibration system in which the voice coil 2 is suspended coaxially in the magnetic void of the magnetic circuit 4 has a tilt angle between its center axis K and a center axis of the frame 5, the diaphragm is adhered to a diaphragm adhesion part of the frame 5 via an edge 3 and a diaphragm mount member 7 and supported.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker used in the field of audio, which improves frequency characteristics by preventing division resonance of a diaphragm at a natural frequency and also eliminates distortion due to vibration. It improves the reproduction sound quality, and a general housing frame is provided in which a speaker in which the central axis of the directional characteristics is inclined with respect to the central axis of the mounting surface of the speaker and the center of the magnetic circuit matches the center of the frame is provided. The present invention relates to the structure of a speaker that is easy to manufacture and use.

[0002]

2. Description of the Related Art In a cone speaker which has been widely used in the past, as is well known, a diaphragm has an axisymmetric shape, and a voice coil is coaxially attached to the tip mounting tip at the center of the center axis. , It has a structure that drives this center. In such a structure where the busbar has a uniform length, the vibration plate bends due to vibration, resulting in a split resonance state at a natural frequency, and at this resonance frequency peaks and dips occur on the frequency characteristics and the transient characteristics deteriorate. Furthermore, there is a drawback that the shape of the diaphragm is distorted due to the bending of the diaphragm base body due to the unreasonable vibration, and the reproduced sound quality is deteriorated. In addition, since the center axis of the directional characteristic, that is, the center axis of the diaphragm coincides with the center axis of the mounting surface of the speaker in the axisymmetric speaker, the center axis of the directional characteristic is inclined with respect to the front center axis of the speaker. Requires an additional structure such as an acoustic lens in front of the speaker. To eliminate this drawback, there are eccentric cone loudspeakers in which the diaphragm is not coaxial with the drive point, ie the voice coil.

As shown in the structure of FIGS. 5 and 6, the above-described eccentric cone speaker has a vibration system in which a voice coil 12 is attached to the tip of an eccentric cone diaphragm 11 having a non-circular outer periphery, as well as a vibration system. Inside the non-circular frame 15 in which the magnetic circuit 14 is attached at a position deviated from the center, the voice coil 12 is inserted into the magnetic gap 14a of the magnetic circuit 14 in a vibrating manner, and the voice coil 12 is inserted through the edge 13. It is a supported structure. In the speaker having such a structure, since the distance from the driving point where the voice coil 12 is attached to each peripheral portion of the diaphragm 11 is not uniform, significant split resonance at the natural frequency does not occur.
It is possible to eliminate the above-mentioned peaks and dips on the frequency characteristic, deterioration of the transient characteristic, and distortion due to bending of the diaphragm substrate. Further, the central axis k of the directional characteristic is inclined in the major axis direction of the speaker. There is an advantage that can be made.

[0004]

The above-mentioned eccentric cone speaker removes a factor that deteriorates the characteristics due to the shape of the diaphragm 11 and keeps the sound quality of the speaker good. Due to the asymmetry of the shape of the diaphragm 11, a non-circular frame 15 having a shape corresponding to the shape is required, and the assembly process is extremely difficult in assembling and manufacturing the speaker, and the cost is high. That is, in the manufacturing process of the speaker, it has been customary to apply the adhesive and assemble the parts with the center of the magnetic circuit 14 as the reference position. Since the parts and their positions are eccentric, a special manufacturing facility is required, and there is a problem to be solved that the structure is extremely difficult to produce.

Therefore, according to the present invention, while the magnetic circuit and the frame are made axially symmetrical with respect to the magnetic circuit as in the conventional case, only the vibrating system is used as the eccentric cone so as to prevent the characteristic from deteriorating and the conventional production. It is an object of the present invention to provide a speaker with excellent characteristics, which has been devised so that it can be produced by the equipment and production method.

Although the eccentric cone speaker has been described above, a speaker equipped with a so-called obli-cone in which a right circular cone is cut by an oblique plane that is not orthogonal to the axis exhibits the same acoustic radiation effect as the eccentric cone speaker of the present invention. However, since the top surface of the magnetic circuit is not parallel to the frame, it has a drawback that it is difficult to assemble the magnetic circuit in the center of the manufacturing process.

[0007]

A loudspeaker according to the present invention for achieving the object will be described with reference to the reference numerals used in the embodiments shown in FIGS. ) With a magnetic circuit (4) coaxially attached thereto, the outer periphery of which is circular, and the frame (5) having a symmetrical shape with respect to the axial center (Y) has an eccentric shape in which the lengths of the respective bus bars are different. The voice coil (2) attached to the voice coil attachment top (1a) of the diaphragm (1) is connected to the magnetic circuit (4).
The vibration system (A) suspended and attached coaxially in the magnetic air gap (X) of the above holds its central axis (k) at an inclination angle with the central axis (Y) of the frame (5), A speaker characterized by being attached and supported by a diaphragm attaching portion (5a) of a frame (5) via an edge portion (3) of the diaphragm (1) and a diaphragm attaching member (7). Is.

That is, according to the present invention, the vibrating system A in which the voice coil 2 is fixed at a position having an inclination angle with the axis K of the vibrating plate 1 and the magnetic circuit 4 is attached to the center of the bottom of the frame 5. The speaker is characterized in that the voice coil 2 is supported inside via an edge 3 in a state that the voice coil 2 is oscillatably fitted in a magnetic gap of the magnetic circuit 4.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The first embodiment shown in the front view of FIG. 1 and the side sectional view of FIG. 2 in the embodiment of the speaker of the present invention.
A description will be given based on examples. Reference numeral 1 denotes a vibrating plate, which has an eccentric cone shape, and a hole 1b for attaching the voice coil 2 is provided in the conical top portion 1a.

On the outer periphery of the diaphragm 1, an edge portion 3 having a corrugation for supporting the diaphragm 1 is attached. Further, a diaphragm mounting member 7 also serving as a gasket is attached to the outer periphery of the edge portion 3, and the outer peripheral edge of the diaphragm mounting member 7 is a concentric circle centered on the mounting portion of the voice coil 2. To form.

The voice coil 2 has a well-known structure in which an insulated wire is wound around a bobbin as in the conventional case. The voice coil 2 is fixed to the top 1a of the diaphragm 1 to form a vibration system A. A damper 6 for supporting the vibration of the vibration system and further stabilizing the vibration is attached near the top 1a of the vibration plate 1 of the vibration system A, and the outer periphery thereof is adhered to the frame 5.

Reference numeral 4 denotes a magnetic circuit, in which a ring-shaped upper plate 4b, a magnet 4c, and a lower plate 4d are concentrically assembled to form an annular magnetic gap 4a. The magnetic circuit 4 is fixed to the center of the bottom of a well-known circular frame 5.

The vibration system A is composed of the voice coil 2
Is inserted into the magnetic gap 4a of the magnetic circuit 4 so as to be able to vibrate, and inside the frame 5 via the edge portion 3,
Will be retained. The outer peripheral portion of the damper 6 is adhered to the bottom portion of the frame 5 to further support the lateral vibration of the vibration system A.

In the above-mentioned speaker of the present invention, the voice coil 2 is attached to the top of the non-circular diaphragm 1, and the distance from the generatrix of the diaphragm 1, that is, the driven point to the outer peripheral edge is the circumferential direction. Since they are all different from each other, the axis K of the diaphragm 1 and the magnetic circuit 4 and the frame 5 that form the magnetic gap 4a.
It has a non-uniform inclination angle with respect to the central axis of.

Therefore, there is no portion on the diaphragm 1 that is axially symmetric with respect to the driving point, and the divisional resonance in which the diaphragm base body vibrates in a transverse wave at a specific frequency does not occur. Further, the central axis of the directional characteristic can be inclined in the major axis direction of the speaker.

Therefore, as in the conventional example, there are peaks and dips on the frequency characteristic, the transient characteristic is deteriorated, and further, the vibrating state is distorted due to excessive bending during vibration of the diaphragm substrate. Does not deteriorate the sound quality.
Further, the central axis of the directional characteristic can be inclined with respect to the front axis of the speaker mounting surface.

The magnetic circuit 4 is fixed to the center of the frame 5, and by applying the adhesive and assembling the parts with the center of the magnetic circuit 4 as a reference position, the conventional production equipment,
Loudspeakers can be manufactured using the same production method. Therefore, it is not necessary to newly provide a dedicated production facility for this embodiment or to develop a special production technique, and it is possible to use the facility cost and the manufacturing man-hours as in the past, so that the production cost is increased. There is no such thing.

[0018]

Embodiments of the speaker of the present invention will be described below. The configuration and operation of the basic elements of the first embodiment are as described in detail in the section of the above-mentioned embodiment based on FIGS. 1 and 2, and are provided on the top portion 1a of the eccentric diaphragm 1. The voice coil 2 into the hole 1b for attaching the voice coil 2
Is fixed, and a damper 6 having an outer periphery bonded to the frame 5 is mounted in the vicinity thereof to support the vibration of the vibration system A, and the voice coil 2 is vibrably fitted into the magnetic gap 4a of the magnetic circuit 4. In the state of being kept, the holding is further stable. Voice coil 2 with insulated wire wound around bobbin
The winding, the lead wire of the input section, the terminal, and the like have the same configuration as the conventional one.

A corrugated edge portion 3 for supporting the diaphragm 1 is formed on the outer periphery of the diaphragm 1. Further, a diaphragm mounting member 7 also serving as a gasket is attached to the outer periphery of the edge portion 3. An outer peripheral edge 7a of the diaphragm mounting member 7 is centered on the mounting portion of the voice coil 2. Form concentric circles.

FIG. 3 and FIG. 4 respectively show the front and side cross sections of the second embodiment of the present invention. In the second embodiment, the vibrating portion of the diaphragm 1 is the same as that described above, and the width of the edge portion 3 is different in the circumferential direction.
Therefore, the mechanical impedance in the radial direction of the vibration system A changes more significantly in the circumferential direction, and has the effect of suppressing the split resonance of the diaphragm substrate. Then, similarly to the above-described embodiment, the outer periphery 3b of the edge portion 3 is a concentric circle centered on the center of the magnetic circuit 4, and the diaphragm mounting member 7 that supports the edge portion 3 has a ring shape with a constant width.

In addition, although not shown, as a modification, in the case where the outer periphery of the diaphragm 1 is a non-circular shape such as an elliptical shape or a shape that is not axially symmetric, and has a shape different from those shown so far. However, as long as the voice coil 2 is mounted at a position deviating from the center of radial symmetry of the diaphragm 1 and the center of the magnetic circuit 4 is mounted at the center of the bottom of the frame 5, the technique of the present invention Included in the range.

The embodiments which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to only the structures of the embodiments, and has the above-mentioned constitutional requirements according to the present invention. The present invention achieves the object of the present invention and can be appropriately modified and implemented within the range having the following effects.

[0023]

As is apparent from the above description, in the speaker according to the present invention, the distance from the driving point around the voice coil to the periphery of the diaphragm, that is, the length of the busbar of the diaphragm 1 and the vibration. Since the axis K of the plate 1 and the central axes of the magnetic circuit 4 and the frame 5 that form the magnetic gap 4a have non-uniform inclination angles, the mechanical impedances on the diaphragm are all different in the circumferential direction. Therefore, there is no portion that is axially symmetric with respect to the driving point, and the split resonance in which the diaphragm base material vibrates in the transverse wave shape at the natural frequency does not occur.

Therefore, as in the conventional example, peaks and dips are generated on the frequency characteristic, the transient characteristic is deteriorated, and distortion is caused due to the excessive bending of the diaphragm base material, thereby deteriorating the sound quality. There is no such thing. Further, the central axis of the directional characteristic can be tilted in the major axis direction of the diaphragm 1 while maintaining the tilt angle with the central axis of the front surface of the speaker.

Further, the magnetic circuit is fixed to the center of the frame, and by applying the adhesive and assembling the parts with the center of the magnetic circuit as a reference position, the speaker can be manufactured by utilizing the conventional production equipment and production method. It is possible. Therefore, new dedicated production equipment is required for this embodiment,
There is no need to develop special manufacturing techniques, and production costs do not increase due to increased equipment costs and man-hours.

Due to the above advantages, a speaker having excellent frequency characteristics and transient characteristics, excellent reproduction sound quality, and having a directional characteristic center axis inclined from the front axis of the speaker can be produced with the same steps as conventional speakers. In addition, the effect that it can be provided at low cost can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment of a speaker of the present invention.

FIG. 2 is a side sectional view of the first embodiment.

FIG. 3 is a front view of the second embodiment.

FIG. 4 is a side sectional view of a second embodiment.

FIG. 5 is a front view of a conventional example.

FIG. 6 is a side sectional view of a conventional example.

[Explanation of symbols]

 1 diaphragm 1a voice coil top 2 voice coil 3 edge 4 magnetic circuit 5 frame 5a diaphragm pasting part 6 damper 7 diaphragm mounting member A vibration system X magnetic air gap K vibration system axis Y frame axis

Claims (1)

[Claims] 1. A magnetic circuit (4) having an annular magnetic gap (X).
The voice coil of the eccentric diaphragm (1) in which the length of each busbar is made different on the frame (5) which is coaxially attached, has a circular outer periphery, and has a symmetrical shape about the axis (Y). The voice coil (2) mounted on the mounting top (1a) is coaxially suspended in the magnetic gap (X) of the magnetic circuit (4), and the vibration system (A) is mounted on the central axis (k). ) Holds the central axis (Y) of the frame (5) and the inclination angle, and holds the edge portion of the diaphragm (1).
A speaker characterized in that it is attached to and supported by a diaphragm attaching portion (5a) of a frame (5) via (3) and a diaphragm attaching member (7).