JP2007311966A - Eccentric type diaphragm for speaker device, and speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an eccentric type diaphragm for a speaker device whose sensitivity can mainly be improved without increasing the weight of a body. <P>SOLUTION: The eccentric type diaphragm comprises a stack (body) formed by stacking a plurality of base materials and has a fitting hole for fitting to a voice coil bobbin while the center of the fitting hole is eccentric with respect to the center of the stack; and at least one of the plurality of base materials has an opening on the side where the distance from the center of the fitting hole to an outer edge of the stack is large, and the opening does not penetrate the stack. Consequently, the weight of the part of the stack, corresponding to a weight-excessive part, based upon the center of the fitting hole is reducible to correct imbalance of the diaphragm itself. As a result the diaphragm itself becomes light, and sensitivity can be increased. Further, the diaphragm has the structure wherein the opening does not penetrate the stack, so when the diaphragm vibrates, the speaker device does not decrease in sensitivity in spite of the opening. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of an eccentric type diaphragm for a speaker device.

  Conventionally, an eccentric diaphragm having a shape in which the center of an attachment hole used when attaching to a boil coil bobbin is eccentric with respect to the center of the body is known.

  Such a speaker device having an eccentric diaphragm has a voice coil bobbin through which the eccentric diaphragm is positioned so that the central axis passing through the center of the mounting hole is coaxial with the central axis of the voice coil bobbin. Is attached. With this configuration, it is possible to disperse divided vibrations generated in the eccentric type diaphragm, to obtain frequency characteristics with few peaks and dips, and to suppress deterioration of high-frequency directivity characteristics.

  However, as described above, such an eccentric diaphragm has a shape in which the center of the mounting hole used when being attached to the boil coil bobbin is eccentric with respect to the center of the body. For this reason, in such an eccentric type diaphragm, the weight on the side where the distance from the center of the mounting hole to the outer edge of the fuselage is larger than the center of the mounting hole is from the center of the mounting hole to the outer edge of the fuselage. The distance is larger than the weight on the small side. For this reason, in such an eccentric type diaphragm, the balance between the moment of inertia of the body portion on the larger weight side and the moment of inertia of the body portion on the smaller weight side is lost. As a result, when the eccentric diaphragm vibrates, rolling (rolling) occurs, and the vibration coil member such as the voice coil bobbin or the voice coil wound around the voice coil bobbin and the magnetic circuit are easily mechanically hit. There is a problem that abnormal sound is generated by hitting.

  For example, Patent Literatures 1 and 2 describe an eccentric diaphragm (speaker eccentric cone) that can improve this type of problem.

  In the eccentric cone for a speaker described in Patent Documents 1 and 2, a metal balancer is attached to the outer peripheral portion of the cone surface on the side having a small moment of inertia with respect to the eccentric hole. As a result, the unbalance of the moment of inertia of the entire speaker eccentric cone is corrected, and the above-described problems can be improved.

  An eccentric speaker device has been proposed that can correct the imbalance of the moment of inertia by making the magnetic flux density near the center of the diaphragm non-uniform and the magnetic flux density far away from the diaphragm (for example, , See Patent Document 3).

  Further, although not an eccentric type diaphragm, examples of a speaker device diaphragm, a speaker device, and a speaker device edge that can improve the above-described problems are proposed in Patent Documents 4 to 6, respectively. .

  The diaphragm for a speaker device described in Patent Document 4 is formed by integrally forming a weight balance portion thicker than other portions on the side opposite to the side supporting the voice coil feed line of the diaphragm. Thereby, it is supposed that rolling can be suppressed.

  The speaker device described in Patent Document 5 listens to a portion where the left and right cone surface radii are equal to the center line of the cone-shaped diaphragm, the curvature of the cone curve is asymmetric, and the curvature of the cone curve is large. It is installed as a point side. With this configuration, the effective area of the vibration surface facing the listening point is increased, the direct sound is increased, and the directivity characteristic with respect to the listening point is expanded. As a result, it is said that the sound quality can be improved.

  Further, the edge for the speaker device described in Patent Document 6 is coupled to the outer periphery of an elliptical or non-circular diaphragm, and the width on the minor axis direction side is narrower than the width on the major axis direction side of the diaphragm, The length dimension when deployed at any position over the entire circumference is the same. With such a configuration, it is said that the stiffness can be made equal over the entire circumference of the edge for the speaker device, the balance of the support system is corrected, and an excellent performance with little distortion can be obtained.

JP-A-11-155189 Japanese Patent No. 3405160 JP 2002-374595 A Japanese Patent Laid-Open No. 2005-6140 Japanese Patent No. 2952920 Japanese Patent No. 3132253

  In the eccentric cone for speakers described in Patent Documents 1 and 2 described above, by providing a metal balancer, the imbalance of the moment of inertia is corrected, and abnormal sound due to mechanical contact between the vibration system member and the magnetic circuit is corrected. This has the advantage that generation can be prevented.

  However, since such a speaker eccentric cone is provided with a metal balancer, the weight of the speaker eccentric cone increases accordingly, and the sensitivity of the speaker device (especially in the high frequency range) decreases. In addition, there is a problem that the product cost of the eccentric cone for the speaker becomes high.

  Examples of problems to be solved by the present invention include the above. The present invention aims to improve the sensitivity of a speaker device without increasing the weight of the eccentric speaker device diaphragm and reduce the product cost of the speaker device and the speaker device. It is an issue to provide.

  The invention according to claim 1 is a diaphragm for an eccentric type speaker device, which is constituted by a laminated body in which a plurality of base materials are laminated, has an attachment hole for attaching to a voice coil bobbin, and the laminated layer. The center of the mounting hole is eccentric with respect to the center of the body, and at least one of the plurality of base materials has a large distance from the center of the mounting hole to the outer edge of the laminate. An opening is provided on the side, and the opening does not penetrate the stacked body.

  In one embodiment of the present invention, an eccentric speaker device diaphragm is constituted by a laminated body in which a plurality of base materials are laminated, has an attachment hole for attaching to a voice coil bobbin, and The center of the mounting hole is decentered with respect to the center, and at least one of the plurality of base materials has a larger distance from the center of the mounting hole to the outer edge of the laminate. Is provided with an opening, and the opening does not penetrate the laminate.

  The above-mentioned eccentric type diaphragm for a speaker device is constituted by a laminated body in which a plurality of base materials are laminated, has an attachment hole for attaching to a voice coil bobbin, and the attachment hole with respect to the center of the laminated body The center of each has an eccentric shape. Thus, since the diaphragm for an eccentric type speaker device is constituted by a laminated body formed by laminating a plurality of base materials, compared to an eccentric type diaphragm constituted by one base material, The strength of the eccentric type diaphragm for a speaker device can be improved. In a preferred example, the material for forming each substrate is preferably a paper material such as papermaking, a polymer material such as polypropylene, a fiber material such as a cloth material, or a composite material including these materials.

  In the eccentric type speaker device diaphragm, in at least one of the plurality of substrates constituting the laminate, an opening is provided on the side where the distance from the center of the mounting hole to the outer edge of the laminate is large. Is provided. Thus, when the center of the mounting hole is used as a reference, the weight of the portion of the laminated body corresponding to the side where the weight of the laminated body is excessive, that is, the side where the distance from the center of the mounting hole to the outer edge of the laminated body is large is reduced. can do. Therefore, the moment of inertia of the portion of the laminated body corresponding to the side where the distance from the center of the mounting hole to the outer edge of the laminated body is large, and the laminated body corresponding to the side where the distance from the center of the mounting hole to the outer edge of the laminated body is small Imbalance with the moment of inertia of the part can be improved (corrected). Therefore, in a speaker device using such an eccentric type speaker device diaphragm, rolling (rolling) is less likely to occur during the vibration, and mechanical contact between the vibration system member and the magnetic circuit does not occur. As a result, no abnormal noise is generated due to mechanical contact between the vibration system member and the magnetic circuit.

  Further, in the eccentric type speaker device diaphragm, since the opening is provided in the laminated body, the weight of the eccentric type speaker device diaphragm is reduced accordingly, and accordingly the sensitivity of the speaker device ( In particular, high-frequency sensitivity) can be improved. Further, with this configuration, it is not necessary to provide a balancer like the diaphragms of the above-mentioned Patent Documents 1 and 2, and accordingly, the product cost of the eccentric type speaker device diaphragm can be reduced, and as a result It is also possible to reduce the product cost of the speaker device.

  Further, in order to easily improve the unbalance of the moment of inertia of the diaphragm for the eccentric type speaker device, the laminate has a cone shape, and the opening is provided in an outer peripheral portion of the at least one base material. It is preferred that In a preferred example, it is preferable that a plurality of the openings are provided along the outer peripheral portion of the at least one base material at appropriate intervals.

  Moreover, it is preferable that the size (area) of the opening is set to a size that corrects the imbalance of the moment of inertia of the laminated body caused by the shape of the eccentric laminated body. That is, the size (area) of the opening is the magnitude of the moment of inertia of the portion of the laminate on the side where the distance from the center to the outer edge of the laminate is the largest when the center of the mounting hole is used as a reference, It is preferable that the magnitude of the moment of inertia of the part of the laminated body on the side where the distance from the center to the outer edge of the laminated body is the smallest is set to be substantially the same (including the same).

  Further, each of the plurality of base materials constituting the laminated body is formed of a material having a different specific gravity, and the opening that plays a role in correcting an imbalance of an inertia moment of an eccentric type speaker device diaphragm includes the plurality of base materials It is preferable to be provided on the base material having the largest specific gravity among the base materials. Thereby, the magnitude | size (area) of the said opening formed in a laminated body can be made small.

  In addition, when assuming a comparative example in which an eccentric type diaphragm is formed by a single base instead of a plurality of bases, and an opening having the above function penetrates the diaphragm, in such a comparative example, During the vibration, air leaks from the opening that is the through hole, and the sound waves emitted to the sound emission side and the sound waves emitted to the sound emission side and the opposite side interfere with each other, reducing the sensitivity of the speaker device. Problem may occur.

  In this regard, the eccentric type speaker device diaphragm is constituted by a laminated body formed by laminating a plurality of base materials, and an opening is provided in at least one base material among the plurality of base materials. It has a structure that does not penetrate the body. Therefore, at the time of vibration of the eccentric type speaker device diaphragm, the problem as in the above comparative example does not occur, and the sensitivity of the speaker device does not decrease due to the opening.

  In another embodiment of the present invention, the above-described eccentric speaker device diaphragm and a voice coil bobbin are provided, and the eccentric speaker device diaphragm includes an axis passing through the center of the mounting hole and the voice. The coil bobbin is attached to the voice coil bobbin through the attachment hole so that the central axis of the coil bobbin is located coaxially. As a result, a speaker device having an eccentric speaker device diaphragm can be configured.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of speaker device]
FIG. 1 is a cross-sectional view of a speaker device 100 including an eccentric diaphragm 8 according to an embodiment of the present invention, cut along a plane passing through the central axis L1.

  As shown in FIG. 1, the speaker device 100 includes a magnetic circuit 30 including a yoke 1, a magnet 2, and a plate 3, a frame 4, a voice coil bobbin 5, a voice coil 6, a damper 7, an eccentric diaphragm 8, and an edge 9. And a vibration system member 31 including the cap 11. In the present invention, the structure and driving method of the speaker device are not limited.

  First, the configuration of the magnetic circuit 30 will be described.

  The magnetic circuit 30 is configured as an external magnet type magnetic circuit.

  The yoke 1 has a pole portion 1a having a substantially columnar shape, and a flange portion 1b formed so as to extend outward from the lower end portion of the outer peripheral wall of the pole portion 1a.

  The magnet 2 has a substantially annular shape and is mounted on the flange portion 1b. On the magnet 2, a plate 3 having a substantially annular shape is attached. A magnetic gap 32 is formed in the gap between the inner peripheral wall of the plate 3 and the outer peripheral wall of the pole portion 1a.

  Next, the configuration of the vibration system member 31 will be described.

  The frame 4 has a function of supporting various speaker device components. The frame 4 has a substantially bowl-like shape and a step-like cross-sectional shape, and includes a first step portion 4a, a second step portion 4b provided on the outer side of the first step portion 4a, and the second step portion 4a. And a third step portion 4c provided on the upper side and on the outer side of the step portion 4b. The first step 4 a that is an element of the frame 4 is attached on the plate 3. Thereby, the frame 4 is coupled to the magnetic circuit 30.

  The voice coil bobbin 5 has a substantially cylindrical shape. The vicinity of the lower end portion of the voice coil bobbin 5 covers the vicinity of the upper end portion of the pole portion 1 a of the yoke 1. For this reason, the vicinity of the lower end portion of the inner peripheral wall of the voice coil bobbin 5 faces the vicinity of the upper end portion of the outer peripheral wall of the pole portion 1a, while the vicinity of the lower end portion of the outer peripheral wall of the voice coil bobbin 5 Opposite to a part of the inner peripheral wall of the magnet 2.

  The voice coil 6 is wound around the lower end portion of the outer peripheral wall of the voice coil bobbin 5, and the outer peripheral wall of the voice coil 6 faces the inner peripheral wall of the plate 3. The voice coil 6 is composed of one wiring and has positive and negative lead wires (not shown). The positive lead wire is an input wiring for an L (or R) channel signal, and the negative lead wire is an input wiring for a ground (GND) signal. Each of the positive and negative lead wires is electrically connected to a terminal (not shown) provided at an appropriate position of the frame 4, while the terminal is also electrically connected to an output wiring on the amplifier side (not shown). ing. As a result, a signal or power for one channel is input to the voice coil 6 from the amplifier side via the terminals, plus and minus lead wires.

  The damper 7 has a substantially annular shape, and includes a plurality of concentric corrugated elastic portions that elastically support the voice coil bobbin 5 and the like. The inner peripheral edge of the damper 7 is attached near the upper end of the outer peripheral wall of the voice coil bobbin 5, while the outer peripheral edge of the damper 7 is attached on the second step 4 b of the frame 4.

  The eccentric diaphragm 8 has a function of radiating a sound wave corresponding to an input signal. The eccentric type diaphragm 8 has a cone shape and is provided with an attachment hole 8c used when attaching itself to the voice coil bobbin 5. An inner peripheral edge 8 b of the eccentric diaphragm 8 is attached to the upper end of the outer peripheral wall of the voice coil bobbin 5. As a result, the central axis L1 of the speaker device 100, which is also the central axis of the voice coil bobbin 5, and the axis L2 passing through the center of the mounting hole 8c of the eccentric type diaphragm 8 are positioned coaxially. On the other hand, an edge 9 having a substantially Ω cross-sectional shape is attached to the outer peripheral portion 8 d of the eccentric type diaphragm 8. The outer peripheral edge portion of the edge 9 is attached on the third step portion 4 c of the frame 4. The detailed configuration of the eccentric diaphragm 8 will be described later.

  The cap 11 has a dome-like shape, and the vicinity of the outer peripheral end portion thereof is attached on the sound emitting surface of the inner peripheral portion of the eccentric diaphragm 8 serving as the sound emitting side. For this reason, the cap 11 plays a role of preventing moisture, foreign matter, and the like from entering the magnetic circuit 30 side from the sound emission side.

  In the speaker device 100 having the above configuration, the signal and power output from the amplifier side are supplied to the voice coil 6 via the terminals and the positive and negative lead wires of the voice coil 6. As a result, a driving force is generated in the voice coil 6 within the magnetic gap 32, and the eccentric diaphragm 8 is vibrated in the direction of the central axis L1 of the speaker device 100. Thus, the speaker device 100 radiates sound waves in the direction of the arrow Y1.

[Configuration of eccentric type diaphragm]
Next, the configuration of the eccentric type diaphragm 8 according to the embodiment of the present invention will be described with reference to FIGS.

FIG. 2 is a perspective view of the eccentric diaphragm 8 when observed from the back side opposite to the sound emitting surface of the eccentric diaphragm 8 in the sound emitting direction Y1 of FIG. FIG. 3 is a plan view of the eccentric diaphragm 8 when observed from the back side opposite to the sound emitting surface of the eccentric diaphragm 8 in the sound emitting direction Y1 of FIG. Note that, in FIGS. 1 to 3, the straight line L2, along an axis passing through the center O ₁ of the mounting hole 8c, the line L3 is a center O ₂ of the laminated body constituting the diaphragm 8 of the eccentric mounting hole 8c is a straight line passing through the center O ₁ of the straight line L4 is a central axis parallel the laminate 8a as a straight line L2 laminates center O ₂ of the. FIG. 4A is a cross-sectional view of the main part showing the laminated structure of the eccentric type diaphragm 8 taken along the cutting line AA ′ in FIGS. 2 and 3, and in particular, the eccentric type diaphragm 8 is configured. It is principal part sectional drawing when cut | disconnecting in the position which passes along the opening provided in the at least 1 base material among the several base materials which are the elements of the laminated body to perform.

  The basic configuration of the eccentric type diaphragm 8 is as described above, and the eccentric type diaphragm 8 has a cone shape, as shown in FIG. The first base member 80 disposed on the opposite side of the sound side, the third base member 82 disposed on the sound output side, and the first base member 80 and the third base member 82 are disposed. It is comprised by the laminated body 8a which has a laminated structure (3 layer structure) with the 2nd base material 81. In a suitable example, as a forming material of the 1st base material 80, the 2nd base material 81, and the 3rd base material 82, for example, paper materials, such as papermaking, polymer system materials, such as polypropylene, cloth material, etc. Of these, a fiber material or a composite material containing these materials is preferable.

Also, the diaphragm 8 of the eccentric has when viewed in plan, the shape of the center O ₁ of the mounting hole 8c does not coincide with respect to the center O ₂ of the laminate 8a constituting itself, namely an eccentric shape . That is, in the vibration plate 8 of such eccentric, is set to a distance between the center _{O 1} of the mounting hole 8c and the center _{O 2} of the laminate 8a is d1 (> 0), the center _{O 1} of the attachment hole 8c on the straight line L3 (or, axis L2 passing through the center _{O 1} of the mounting hole 8c) the center _{O 2} of the laminate 8a position shifted from (or central axis L4 passing through the center _{O 2} of the laminate 8a), i.e. set to a position eccentric Has been.

Thus, the diaphragm 8 of such eccentric, on the straight line L3, the outer edge (outer periphery of the laminate 8a of the direction from the center O ₁ of the mounting hole 8c to the center O ₂ of the laminate 8a (dashed arrow Y2) the distance to the parts), together have become d2, an outer edge (outer peripheral edge of the laminate 8a of the center O ₂ to toward the opposite direction of the laminate 8a from the center O ₁ of the mounting hole 8c (solid arrow Y3 direction) ) Is d3 (<d2).

Further, the first base among the plurality of base materials, that is, the first base material 80, the second base material 81, and the third base material 82, constituting the laminated body 8 a of the eccentric diaphragm 8. the wood 80, the distance is larger side from the center O ₁ of the mounting hole 8c to the outer edge of the laminate 8a (dashed arrow Y2 direction), an opening 80a having a circular planar shape is provided with a plurality. In this example, a plurality of openings 80a are provided along the outer peripheral portion of the first base member 80 constituting the stacked body 8a and at appropriate intervals. For this reason, the opening 80 a does not penetrate the laminated body 8 a constituting the eccentric type diaphragm 8.

Diaphragm 8 of the eccentric type having the above configuration, as shown in FIG. 1, so that the axis L2 passing through the center O ₁ of the mounting hole 8c is positioned coaxially with the central axis L1 of the voice coil bobbin 5, the The voice coil bobbin 5 is attached to the vicinity of the upper end portion of the voice coil bobbin 5 through the attachment hole 8c.

  Next, the specific operational effects of the eccentric diaphragm 8 according to the above-described embodiment will be described.

  Generally, an eccentric type diaphragm has a shape in which the center of the mounting hole used when mounting itself to the voice coil bobbin is eccentric with respect to the center of the body constituting the center, so that the outer edge from the center of the mounting hole. The effective area of the body portion on the side where the distance is large is larger than the effective area of the body portion on the side where the distance from the center of the mounting hole to the outer edge is small. Therefore, in such a diaphragm, the weight of the body portion on the side where the distance from the center of the mounting hole to the outer edge is large is larger than the weight of the body portion on the side where the distance from the center of the mounting hole to the outer edge is small. As a result, in such a diaphragm, the inertial moment of the fuselage portion on the side where the distance from the center of the mounting hole to the outer edge is larger than the inertial moment of the fuselage portion on the side where the distance from the center of the mounting hole to the outer edge is small. . As a result, in such an eccentric type diaphragm, due to its shape, the moment of inertia of the body part on the side where the distance from the center of the mounting hole to the outer edge is large and the distance from the center of the mounting hole to the outer edge are small The balance with the moment of inertia of the body part on the side will be lost.

  For this reason, when the eccentric diaphragm vibrates, rolling (rolling) occurs due to the unbalance of the moment of inertia of the eccentric diaphragm itself, and the voice coil bobbin, the voice coil wound around the voice coil bobbin, etc. There is a problem that a mechanical contact between the vibration system member and the magnetic circuit occurs, and an abnormal sound is generated accordingly.

  Therefore, in order to improve such a problem, for example, in Patent Documents 1 and 2 described above, a metal balancer is provided on the diaphragm portion on the side where the distance from the center of the mounting hole of the diaphragm to the outer edge is small. Provide a balance between the moment of inertia of the diaphragm on the side where the distance from the center of the mounting hole to the outer edge is large and the moment of inertia of the part of the diaphragm on the side where the distance from the center of the mounting hole to the outer edge is small. I try to improve. Thereby, the imbalance of the moment of inertia is corrected, the rolling is suppressed, and the above-described abnormal noise is hardly generated.

  However, when a balancer is provided on the eccentric type diaphragm in this way, the weight of the eccentric type diaphragm is increased by that amount, and the sensitivity of the speaker device (especially the sensitivity in the high range) is lowered. There is a problem that the product cost of the eccentric type diaphragm is increased.

  Therefore, in this embodiment, in order to solve such problems and correct the imbalance of the moment of inertia caused by the shape of the eccentric diaphragm, the rolling is suppressed and the occurrence of abnormal noise is prevented. In addition, an opening is provided on the excessive weight side of the laminated body 8a constituting the eccentric diaphragm 8, and the weight of the excessive weight side of the laminated body 8a is reduced. In addition, since the idea about the method for improving the imbalance of the moment of inertia in the present invention is substantially the same as the above-mentioned Patent Documents 1 and 2, refer to those Patent Documents.

Specifically, first, the eccentric diaphragm 8 of the present embodiment is formed by laminating a plurality of base materials (that is, the first base material 80, the second base material 81, and the third base material 82). It is composed of a laminate 8a comprising Te, itself and has a mounting hole 8c for mounting the voice coil bobbin 5, have a shape in which the center O ₁ is eccentric mounting hole 8c with respect to the center O ₂ of the laminate 8a Thus, a so-called eccentric type diaphragm is formed. Thus, since the eccentric type diaphragm 8 of the present embodiment has a laminated structure composed of a plurality of base materials, the eccentric type vibration plate is compared with the eccentric type diaphragm constituted by one base material. The strength of the plate 8 can be improved.

Then, the (in this example, the first substrate 80) at least one substrate among the plurality of substrates at a distance from the center O ₁ of the mounting hole 8c to the outer edge of the laminate 8a (outer peripheral portion) An opening 80a is provided on the larger side. Accordingly, the center O ₁ of the mounting holes 8c when a reference side of the weight plethora of the laminate 8a, that is, to reduce the weight of the portion of the laminate 8a corresponding to dashed arrow Y2 direction. Therefore, it is possible to improve (correct) the imbalance between the moment of inertia of the stacked body 8a corresponding to the direction of the broken line arrow Y2 and the moment of inertia of the stacked body 8a corresponding to the direction of the solid line arrow Y3. Therefore, in the speaker device 100 using such an eccentric type diaphragm 8, rolling (rolling) hardly occurs during the vibration, and mechanical contact between the vibration system member 31 and the magnetic circuit 30 does not occur. Therefore, no abnormal noise is generated due to the mechanical contact between the vibration system member 31 and the magnetic circuit 30.

  Further, since the opening 80a is provided in the laminated body 8a, the weight of the eccentric diaphragm 8 is reduced by that amount, and accordingly, the sensitivity (particularly, high frequency sensitivity) of the speaker device 100 is improved. be able to. Further, if such a configuration is adopted, it is not necessary to provide a balancer as in the case of the above-described eccentric type diaphragm, so that the product cost of the eccentric type diaphragm 8 can be reduced by that much, and consequently the speaker. The product cost of the apparatus 100 can be reduced.

  Further, in this embodiment, in order to easily improve the unbalance of the inertia moment of the eccentric type diaphragm 8, the opening 80a is based on a general arithmetic expression of the inertia moment, and the opening 80a constitutes the first structure constituting the stacked body 8a. It is preferable to be provided on the outer peripheral portion of the base material 80 (for example, in the vicinity of the portion where the edge 9 and the laminated body 8a are attached). In a preferred example, it is preferable that a plurality of openings 80a are provided along the outer peripheral portion of the first base member 80 constituting the stacked body 8a and at appropriate intervals.

In addition, the size (area) of each opening 80a is preferably set to a size that corrects the imbalance of the moment of inertia of the stacked body 8a caused by the shape of the eccentric stacked body 8a. That is, the size of each opening 80a (area), the mounting hole 8c center O ₁ is taken as a reference, the laminate 8a from the center O ₁ outer edge (outer periphery) to the distance of the largest side of the the magnitude of the moment of inertia of the portions of the laminate 8a, size and are substantially the same moment of inertia of the portions of the laminate 8a distance is the smallest side from the center O ₁ to the outer edge of the laminate 8a (outer peripheral portion) ( It is preferably set to a size that includes the same.

  In addition, a plurality of base materials (in this example, the first base material 80, the second base material 81, and the third base material 82) constituting the laminated body 8a are formed of materials having different specific gravities, and are eccentric. The opening that plays the role of correcting the imbalance of the moment of inertia of the diaphragm 8 of the mold is preferably provided in the base material having the largest specific gravity among the plurality of base materials. Thereby, the magnitude | size (area) of the said opening formed in the laminated body 8a can be made small.

  In addition, when assuming a comparative example in which an eccentric type diaphragm is formed by a single base instead of a plurality of bases, and an opening having the above function penetrates the diaphragm, in such a comparative example, During the vibration, air leaks from the opening that is the through hole, and the sound waves emitted to the sound emission side and the sound waves emitted to the sound emission side and the opposite side interfere with each other, reducing the sensitivity of the speaker device. Problem may occur.

  In this regard, the eccentric type diaphragm 8 of the present embodiment is a laminated body 8a formed by laminating a plurality of base materials, that is, a first base material 80, a second base material 81, and a third base material 82. The opening 80a is provided only in the first substrate 80 among the plurality of substrates, and the opening 80a has a structure that does not penetrate the stacked body 8a. Therefore, when the eccentric diaphragm 8 vibrates, the problem as in the comparative example does not occur, and the sensitivity of the speaker device 100 does not decrease due to the opening 80a. Instead of such a configuration, in the present invention, in order to improve such a problem, the eccentric type diaphragm is constituted by a laminated body formed by laminating a plurality of base materials, Of these, an opening may be provided in at least one base material, and the opening may have a structure not penetrating the laminate.

[Modification]
In the above embodiment, in the eccentric type diaphragm 8, a plurality of base materials constituting the laminated body 8a (in this example, the first base material 80, the second base material 81, and the third base material 82). Among them, the opening 80 a is provided in the first base member 80. Not only this but in this invention, as shown in FIG.4 (b), the opening 81a is provided in the 2nd base material 81 among the said several base materials, or as shown in FIG.4 (c), You may make it provide the opening 82a in the 3rd base material 82 among the said some base materials. 4B and 4C are cross-sectional views of the main part of the eccentric type diaphragm 8 corresponding to FIG. 4A. Further, in the present invention, from the viewpoint of preventing the reduction in sensitivity of the speaker device 100 as described above, such an opening does not have to penetrate the laminated body 8a, and thus such an opening constitutes the laminated body 8a. What is necessary is just to be provided in at least 1 base material among the several base materials.

In the above embodiment, the opening having the role of correcting the imbalance of the moment of inertia of the eccentric diaphragm 8 is formed to have a circular planar shape. However, in the present invention, the opening has the shape of the opening. There is no limitation. For example, in the present invention, as shown in FIG. 5, in order to improve the design, among the plurality of base materials constituting the laminated body 8a, the base material that becomes the sound emitting surface, that is, the third base in this example. You may make it provide the opening 82x which has design properties, such as a logo which consists of a character, a figure, a pattern, etc., and those combinations in the material 82. FIG. In this case, an opening 82x having the design property, as shown in FIG. 5, a symmetrical shape with respect to the straight line L3 passing through the center O ₁ of the center O ₂ and the mounting hole 8c of the laminate 8a It is preferable to be formed as described above. Thereby, the imbalance of the moment of inertia generated due to the shape of the eccentric type diaphragm 8x can be improved.

  Further, in the above embodiment, the laminated body 8 a constituting the eccentric type diaphragm 8 has a three-layer structure including the first base material 80, the second base material 81, and the third base material 82. However, the present invention is not limited to this, and in the present invention, the laminated body constituting the eccentric diaphragm 8 may be configured to have at least a two-layer structure.

Sectional drawing of the speaker apparatus which has an eccentric type diaphragm which concerns on the Example of this invention is shown. The perspective view when observing from the opposite side to the sound emission surface of the eccentric type diaphragm which concerns on a present Example is shown. The top view when observing from the opposite side to the sound emission surface of the eccentric type diaphragm which concerns on a present Example is shown. Various principal part sectional drawing cut | disconnected in the position which passes along opening of the eccentric type diaphragm which concerns on a present Example is shown. The top view when it observes from the sound emission surface of the diaphragm which concerns on a modification is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 8 Eccentric type diaphragm 8a Laminated body 8b Inner peripheral edge part 8c Mounting hole 8d Outer peripheral part 80 1st base material 81 2nd base material 82 3rd base material 80a, 81a, 82a Opening 100 Speaker apparatus

Claims (6)

Consists of a laminate formed by laminating a plurality of substrates,
Having a mounting hole for mounting to the voice coil bobbin, and having a shape in which the center of the mounting hole is eccentric with respect to the center of the laminate,
In at least one of the plurality of base materials, an opening is provided on a side where the distance from the center of the mounting hole to the outer edge of the laminated body is large, and the opening does not penetrate the laminated body. An eccentric type diaphragm for a speaker device. The laminate has a cone shape,
2. The eccentric speaker device diaphragm according to claim 1, wherein the opening is provided in an outer peripheral portion of the at least one base material.   3. The eccentric speaker device diaphragm according to claim 2, wherein a plurality of the openings are provided along the outer peripheral portion of the at least one base material and at an appropriate interval.   The size of the opening is the magnitude of the moment of inertia of the portion of the laminate on the side where the distance from the center to the outer edge of the laminate is the largest when the center of the mounting hole is used as a reference, The size of the moment of inertia of the portion of the laminate on the side where the distance from the center to the outer edge of the laminate is the smallest is set to be substantially the same. The eccentric speaker device diaphragm according to any one of the preceding claims. The plurality of base materials are formed of materials having different specific gravities,
2. The eccentric speaker device diaphragm according to claim 1, wherein the opening is provided in a base material having the largest specific gravity among the plurality of base materials. An eccentric type diaphragm for a speaker device according to any one of claims 1 to 5,
A voice coil bobbin,
The eccentric type speaker device diaphragm is attached to the voice coil bobbin through the attachment hole so that an axis passing through the center of the attachment hole and a central axis of the voice coil bobbin are located on the same axis. A featured speaker device.

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