JP4823815B2 - Speaker edge, speaker diaphragm and speaker - Google Patents

Description

  The present invention relates to a speaker edge, a speaker diaphragm in which the edge is fixed to an outer peripheral edge portion, and a speaker including the speaker diaphragm.

The edge for the speaker supports the outer periphery of the diaphragm and holds it in the correct position, and also moves flexibly and freely following the movement of the diaphragm, and acts to brake this against lateral vibration . The simplest structure for this edge is a fixed edge that is molded integrally with the same material as the diaphragm, and the diaphragm is easy to move by devising a shape such as making the edge part thinner than the diaphragm body or providing corrugation. It has a structure. Since this fixed edge is made of the same material as the diaphragm, there is a problem that it cannot fully handle the physical properties different from the diaphragm required for the edge. A free edge bonded to the outer peripheral edge of the plate is widely used.
Similar to the fixed edge, an attempt has been made to deal with various physical properties required for the free edge by a roll type, a corrugation type, and various other shapes, as disclosed in Japanese Patent Application Laid-Open No. 61-121691 (Patent Document 1). ) Has a complex structure that combines a large number of pleats formed in a circular arc shape on two small conical surfaces, and absorbs strain of stress at large amplitudes, enabling high linearity and flat frequency characteristics. An edge is disclosed.

In addition, research and development has been advanced from various viewpoints regarding the material constituting the edge. However, in order to cope with the problem that cannot be solved by using only the same material, Japanese Utility Model Publication No. 55-28080 (Patent Document 2). ) Discloses a two-layer structure in which edge resonance is suppressed by stacking another member outside the center portion of the edge. Japanese Patent Laid-Open No. 5-122791 (Patent Document 3) discloses a method of dividing the circumferential direction. It has been disclosed that by changing the thickness or material of the arc portions alternately, sufficient displacement is possible even at large amplitudes, and an edge with excellent force-displacement characteristics and less distortion can be obtained.
On the other hand, the applicant of the present application previously developed a novel edge manufacturing method using a photo-curing resin that is cured by ultraviolet rays and / or visible rays, and disclosed this in JP-A-2006-67043 (Patent Document 4). Further, Japanese Patent Application No. 2005-108235 proposes an improvement and development of this method, in which a diaphragm molded in advance is inserted and integrated at the same time as molding of an edge or a gasket.
JP 61-121691 Reality 55-28080 JP-A-5-122791 JP 2006-67043 A

The free edge is more advantageous than the fixed edge in terms of controlling the acoustic characteristics, but the one made of only one kind of material is not preferable because many peak dips are generated in the frequency characteristics.
The speaker edge disclosed in Japanese Patent Laid-Open No. 61-121691 has improved linearity, reduced distortion, and flattened frequency characteristics. However, since it has a very complicated shape, an expensive mold is required. It has manufacturing problems that are necessary.
The edge disclosed in Japanese Utility Model Publication No. 55-28080 can suppress edge resonance by making the physical properties of the inner peripheral side and the outer peripheral side different from each other, but is manufactured by bonding two soft sheet materials, There is a problem that the sticking process is complicated and it is difficult to maintain stable quality.
The invention according to claims 5 to 8 of JP-A-5-122791 discloses that materials of different materials are arranged alternately in the circumferential direction, but specific materials are specified and each part is joined. No specific means is disclosed, and such a configuration has not been put into practical use.
The edge manufacturing method disclosed in Japanese Patent Application Laid-Open No. 2006-67043 does not require large energy such as heating press or vacuum forming, and can easily manufacture the edge with a small number of man-hours. Since it is formed of a material, it is not sufficient to cover various desired physical properties.

The present invention has been proposed in view of the above, and the object thereof is to absorb stress strain when the diaphragm vibrates, has excellent linearity in force-displacement, and suppresses edge resonance. It is an object of the present invention to easily provide a speaker edge capable of obtaining a flat frequency characteristic, a speaker diaphragm in which the edge is coupled to the outer peripheral edge, and a speaker including the speaker diaphragm.
In order to achieve this object, research has been continued to effectively utilize the edge manufacturing technology developed by the applicant and disclosed in Japanese Patent Application Laid-Open No. 2006-67043 and Japanese Patent Application No. 2005-108235, and the present invention has been completed. Is.

The speaker edge according to the invention of claim 1 has two or more kinds of different materials having different physical properties arranged in the same plane by multicolor molding or insert molding, and the different materials have different Young's modulus and / or internal loss. At least one of the different materials is an edge made of a resin that is cured by ultraviolet rays and / or visible rays, and has a high Young's modulus and a small internal loss on the inner peripheral side from the substantially central portion of the edge roll. A material is arranged, and a material having a low Young's modulus and a large internal loss is arranged on the outer peripheral side.
In the speaker edge according to the second aspect of the present invention, two or more kinds of different materials having different physical properties are arranged in the same plane by multicolor molding or insert molding, and the different materials have different Young's modulus and / or internal loss. At least one of the different materials is an edge made of a resin that is cured by ultraviolet rays and / or visible rays, and has a low Young's modulus and a large internal loss on the inner peripheral side from the substantially central portion of the edge roll. A material is arranged, and a material having a high Young's modulus and a small internal loss is arranged on the outer peripheral side .
Speaker diaphragm according to the invention of claim 3, claim 1, or is characterized by being joined to the outer periphery of the speaker edge according to any one claim of 2.
According to a fourth aspect of the present invention, a speaker includes the speaker diaphragm according to the third aspect.

According to the present invention, easily and freely combining two or more kinds of different materials having different physical properties, can provide a speaker edge to achieve a flat frequency characteristic to suppress the edge resonance, and heat molding or vacuum forming without requiring large energy, such as equal, it can provide a speaker edge that combine different materials. Speaker edge which suppresses the occurrence of peak dips in the frequency characteristic due to edge resonance to achieve a flat frequency characteristic, the vibration speaker to achieve a flat frequency characteristic to suppress the occurrence of peak dips in the frequency characteristic plate may a speaker that realizes a flat frequency characteristic to suppress the occurrence of peak dips in the frequency characteristic to provide.

  Embodiments of the present invention will be described below with reference to the drawings.

First, the configuration of a speaker to which the present invention is applied will be described with reference to FIG.
The loudspeaker shown in FIG. 1 is an electrodynamic loudspeaker provided with an external magnetic type magnetic circuit, and an inner peripheral edge of a cone-type diaphragm 5 in a magnetic gap of a magnetic circuit comprising a yoke 1, a magnet 2 and a plate 3. The voice coil 7 coupled to the boss coil 7 is inserted and disposed, the damper 8 coupled to the outer periphery of the boss coil 7 is fixed to the frame 4, and the other edge of the edge 6 is joined to the outer peripheral edge of the cone diaphragm 5. Is fixed to the frame to support the vibration system in a freely vibrating manner.

  2A and 2B show the speaker edge according to the first embodiment of the present invention. FIG. 2A is a plan view and FIG. 2B is a cross-sectional view taken along line X-X '.

  The edge of the speaker of the first embodiment has a donut shape as a whole as shown in the plan view of FIG. 2 (a), and a roll portion 6a having a roll shape as shown in FIG. 2 (b). A flat inner peripheral edge portion 6b extending inside the roll portion 6a and connected to the diaphragm and a flat outer peripheral edge portion 6c extending outside the roll portion 6a and connected to the frame of the speaker. The edge 6 is formed by joining two types of resin materials near the top of the roll portion. The resin material A having a Young's modulus of 11.0 MPa and an internal loss of 0.18 is disposed on the inner peripheral side, and the Young's modulus is 5.2 MPa. The resin material B having an internal loss of 0.24 is arranged on the outer peripheral side, and two different types of resin materials are arranged in a concentric manner. The two different types of material portions are indicated by hatching with different orientations for convenience.

The edge portion of the 80 mm free edge diaphragm formed by joining different kinds of materials was prepared in the following procedure.
A resin material A having a high Young's modulus and a small internal loss is prepared with a photo-curing resin, and one of a well-known upper mold and lower mold (not shown) is made of a material that transmits ultraviolet rays or visible light. After filling the clearance formed by the mating die, the primary molded product of the roll edge was formed by irradiating with ultraviolet rays. After this primary molded product is taken out from the mold, it is cut into two annular shapes from the top of the roll with a punching die, the cut inner half is placed on the lower mold again, the upper mold is closed, and the outer half Filled with resin material B with low Young's modulus and large internal loss adjusted with photo-curing resin, and cured by UV irradiation and molded the outer half with resin material B. The finished product of the edge of the present invention was obtained by joining and integrating with the inner half.

  The molding method is not limited to the above-mentioned method, and it is possible to fill and mold two types of resin materials successively into the molding die by devising the structure of the molding die. Molding techniques can be used. In addition, the above-described primary molded product stage is separately performed by an arbitrary molding method, and a pre-molded primary molded product is inserted into the above-described mold, and the so-called insert molding is performed so as to be integrated simultaneously with the secondary molding. You can also. In this embodiment, both of the resin materials A and B use a photo-curing resin, but it is not always necessary to use a photo-curing resin, and at least one resin material is cured by ultraviolet rays and / or visible light. The resin may be used. If a photocurable resin is selected as at least one material and a part of the mold is made of a material that transmits ultraviolet rays and / or visible rays correspondingly, a hot press molding or a vacuum molding is used. The edge of the present invention can be easily manufactured regardless of a molding method that requires large energy. As the photocurable resin, a resin containing urethane acrylate resin as a main component and benzoin ether or benzophenoneamine as a photopolymerization initiator is preferably used. The desired physical properties such as Young's modulus and internal loss can be prepared by selecting the main component resin and appropriately changing the type and blending ratio of the monomer and / or oligomer to be blended therein.

  The inner week edge portion 6b of the edge 6 obtained as described above was joined to the outer peripheral edge portion of the separately manufactured cone diaphragm 5, thereby producing a speaker diaphragm. Further, a voice coil 7 is coupled to the inner peripheral edge of the speaker diaphragm, and this voice coil is inserted into a magnetic gap of a magnetic circuit composed of a yoke 1, a magnet 2 and a plate 3, and a damper coupled to the outer periphery of the boss coil 7. 8 was fixed to the frame 4, and the outer peripheral edge portion 6c of the edge 6 was fixed to the frame to produce an electrodynamic speaker as shown in FIG.

  The result of measuring the sound pressure-frequency characteristics of the speaker thus created is shown by a trace a in FIG. Similarly, the result of measuring the sound pressure-frequency characteristics of a speaker incorporating a diaphragm made by combining edges made of only one type of conventional resin material is shown by a trace d in FIG. Comparing the characteristics of the speaker of the present invention and the speaker of the first embodiment, the speaker of the present invention has a lower mid-high range peak dip than the conventional one, and the mid-high range sound pressure-frequency characteristics are flattened. I can see that The mid-high range peak dip occurs in the sound pressure-frequency characteristics because the edge vibrates in the same or opposite phase with respect to the diaphragm due to the resonance generated in that band, and the sound is amplified by the diaphragm and the edge. Alternatively, it can be considered that they cancel each other out, but by arranging materials with different physical properties on the joint side of the edge diaphragm and the joint side of the frame as in this embodiment, the edge resonance points are dispersed. Therefore, it is considered that the peak dip that occurs in the mid-high range is suppressed. Moreover, the trace e of FIG. 5 shows the second harmonic distortion-frequency characteristic of this embodiment, and is reduced as a whole compared with the trace h showing the second harmonic distortion-frequency characteristic of the conventional example. I understand. This is considered to be due to the fact that the stress-strain when the diaphragm vibrates was absorbed and the linearity of force-displacement was improved by the arrangement configuration of the material of the edge in this embodiment.

  3A and 3B show a speaker edge according to a second embodiment of the present invention. FIG. 3A is a plan view, and FIG. 3B is a Y-Y 'sectional view.

  The speaker edge according to the second embodiment has two types of resin materials having different overall shapes in a plan view of FIG. 3A, a cross-sectional shape of FIG. The resin material A having a Young's modulus of 11.0 MPa and an internal loss of 0.18 is on the outer peripheral side, and the Young's modulus is 5.2 MPa and the internal loss is 0.24. The point from which the resin material B was distribute | arranged to the inner peripheral side differs from 1st Example. Different material parts are indicated by hatching. Also in this example, the edge portion of the 80 mm free edge diaphragm was produced in the same manner as in Example 1. Since the selection of the resin materials A and B, the adjustment of physical properties, the molding method, and the like can be made in accordance with Example 1, the speaker edge of this example can also be easily produced.

Similarly to Example 1, a speaker diaphragm in which the edges were combined was manufactured, and a speaker incorporating the speaker diaphragm was manufactured.
As a result of measuring the frequency characteristics of the loudspeaker of the present embodiment, the arrangement relationship of the edge materials is found in both the sound pressure-frequency characteristics (trace b in FIG. 5) and the second harmonic distortion-frequency characteristics (trace f in FIG. 5). On the contrary, it was confirmed that almost the same improvement effect as in Example 1 was obtained.

  4A and 4B show a speaker edge according to a third embodiment of the present invention. FIG. 4A is a plan view and FIG. 4B is a Z-Z 'sectional view.

  The speaker edge of this example is the same as that of Examples 1 and 2 in both the outer shape in plan view shown in FIG. 4A and the cross-sectional shape in FIG. 4B, and only the arrangement relationship of different resin materials A and B is shown. Is different from Examples 1 and 2. Different resin materials A and B are indicated by hatching. The edge is divided into a plurality of arcs along the circumferential direction, and each arc is divided into a resin material A having a Young's modulus of 11.0 MPa and an internal loss of 0.18, and a Young's modulus of 5.2 MPa and an internal loss of 0.24. The resin material B is arranged alternately. In this example as well, as in Examples 1 and 2, the edge portion of the 80 mm free edge diaphragm was produced by a method according to Examples 1 and 2. The difference from the first and second embodiments is the portion related to the cutting of the primary molded product, in which a plurality of arc portions arranged along the circumferential direction are alternately cut and removed. Since the selection of the resin materials A and B, the adjustment of physical properties, the molding method, and the like can be made in accordance with Example 1, the speaker edge of this example can also be easily produced.

As in Examples 1 and 2, a speaker diaphragm in which the edges were combined was manufactured, and a speaker incorporating the speaker diaphragm was manufactured.
As a result of measuring the frequency characteristics of the loudspeaker of the present example, resin materials having different sound pressure-frequency characteristics (trace c in FIG. 5) and second-order harmonic distortion-frequency characteristics (trace g in FIG. 5) It was confirmed that almost the same improvement effect as in Examples 1 and 2 provided in parallel on the side and the outer peripheral side was obtained. Even when different resin materials A and B are alternately arranged along the circumferential direction, it is considered that the occurrence of peak dip is suppressed because the resonance points of the edges are dispersed as in the first and second embodiments. . It is considered that almost the same actions and effects as in Examples 1 and 2 were obtained with respect to the improvement of force-displacement linearity and the reduction of distortion.

  In addition, although the present Example showed what divided each arc part into the substantially fan shape which spreads radially from an inner peripheral side to an outer peripheral side, it is the same also as a structure which deform | transformed each arc part into the spiral shape. The effect of was obtained. Further, in the present embodiment, each arc portion has an equal size, but may be a combination of different sizes.

A typical example has been described above, but the present invention is not limited to this, and various arrangements are possible.
Although Examples 1-3 showed what was applied to an up-roll type edge, it cannot be overemphasized that it can apply to various shape edges, such as a down-roll type thing, a corrugation type thing, and a V-shaped thing. Absent.

  Although an example of a cone type diaphragm has been shown as the diaphragm, this edge is not limited to the cone type, and this edge may be connected to a diaphragm of a dome type or a flat type, and an external magnet type magnetism is used as a speaker driving system. Although an example of an electrodynamic type provided with a circuit has been shown, an electromagnet type magnetic circuit may be provided, or the present invention can be applied to a speaker of a drive system other than the electrodynamic type.

  In addition, although two different types of resin materials are joined by two-color molding, the resin materials are not limited to two types, and three or more types of materials may be combined, and the molding method may be two-color molding or other various types. Without being limited to color molding, insert a primary molded part of the edge that has been partly molded in advance into a predetermined mold, fill with a resin material in the clearance corresponding to the remaining part of the edge, and cure it. It is also possible to apply an integrated insert molding technique. In this case, it is not limited to the resin material alone, but is already known as an edge material such as a woven fabric, a nonwoven fabric, rubber or other elastomers composed of at least one resin material and other various inorganic and organic fiber materials. Any combination with these materials can be used, and many variations can be constructed.

  In addition, the arrangement example of the different materials is not limited to the shape illustrated in the first to third embodiments, but a main material in which a plurality of openings are partially formed is formed, and another material is filled in this opening and cured. It is also possible to take an integrated form.

  The present invention can be widely used for various speakers in which peak dip is reduced in a wide frequency band from low to high, and sound reproduction with flat frequency characteristics is desired.

It is a half sectional view showing the structure of an electrodynamic speaker to which the present invention is applied. It is the top view and sectional drawing of 1st Example of this invention. It is the top view and sectional drawing of 2nd Example of this invention. It is the top view and sectional drawing of 3rd Example of this invention. It is a figure which shows the frequency characteristic of the speaker of this invention and a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Yoke 2 Magnet 3 Plate 4 Frame 5 Cone diaphragm 6 Edge 6a Roll part 6b Inner peripheral edge part 6c Outer peripheral edge part 7 Voice coil 8 Damper

Claims (4)

Two or more kinds of different materials having different physical properties are arranged in the same plane by multicolor molding or insert molding, and the different materials are materials having different Young's modulus and / or internal loss, and at least one of the different materials The kind of material is an edge made of a resin that is cured by ultraviolet and / or visible light,
An edge for a speaker, characterized in that a material having a high Young's modulus and a small internal loss is disposed on the inner peripheral side from a substantially central portion of the edge roll, and a material having a low Young's modulus and a large internal loss is disposed on the outer peripheral side. Two or more kinds of different materials having different physical properties are arranged in the same plane by multicolor molding or insert molding, and the different materials are materials having different Young's modulus and / or internal loss, and at least one of the different materials The kind of material is an edge made of a resin that is cured by ultraviolet and / or visible light,
An edge for a speaker, characterized in that a material having a low Young's modulus and a large internal loss is arranged on the inner peripheral side from a substantially central portion of the edge roll, and a material having a high Young's modulus and a low internal loss is arranged on the outer peripheral side. A speaker diaphragm comprising: the speaker edge according to claim 1 or 2 joined to an outer peripheral edge portion. A speaker comprising the speaker diaphragm according to claim 3.

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