JP2013172183A - Speaker device, voice coil vibrator for speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deflection occurring in a voice coil due to a vibration reaction force of a diaphragm and a force due to eigenmode vibration of the voice coil while thinning a speaker device in the acoustic radiation direction, in the speaker device that includes a vibration direction conversion section.SOLUTION: The speaker device includes a planar voice coil 30 vibrating freely in one axial direction, a magnetic circuit 20 including a magnetic gap 20G in which the voice coil 30 is disposed, a diaphragm 10 vibrating in a direction different from that of the voice coil 30, and a rigid vibration direction conversion part 50 for transmitting the vibration of the voice coil 30 to the diaphragm 10 vibrating in a direction different from the one axial direction. The voice coil 30 or a voice coil support 40 supporting the voice coil 30 has both sides extending in the one axial direction and arranged on the outside of the magnetic gap 20G, and reinforcements 300 for suppressing deflection due to vibration reaction of the diaphragm 10 are provided on both sides.

Description

  The present invention relates to a speaker device and a voice coil vibrating body for a speaker device.

  The speaker device generally includes a magnetic circuit, a voice coil, a diaphragm, a frame, and the like, and transmits the vibration of the voice coil to the diaphragm and emits sound from the diaphragm. The voice coil is generally wound around a voice coil bobbin, and the voice coil bobbin may be reinforced in order to efficiently transmit the vibration of the voice coil to the diaphragm. As a prior art, there are known those in which a reinforcing member is provided on the entire outer peripheral surface of a voice coil bobbin and those in which a belt-like reinforcing member is provided on the outer peripheral surface of a voice coil (see Patent Documents 1 and 2 below).

Japanese Patent Application Laid-Open No. 7-95691 JP 2009-194467 A

  In the conventional speaker, the vibration direction of the voice coil and the vibration direction of the diaphragm coincide with each other. When the speaker is thinned along the vibration direction of the diaphragm, the vibration width of the voice coil is reduced by the thinning of the speaker. It will be regulated. For this reason, it is difficult to achieve both the large amplitude of the diaphragm and the thinning of the speaker, which are necessary when performing low-frequency range reproduction with high sound pressure.

  For this, the vibration direction of the voice coil and the vibration direction of the diaphragm are made different, and the vibration of the voice coil is changed to the diaphragm via the vibration direction conversion unit that converts the input of one vibration direction into the vibration of the different direction. By transmitting, it is possible to increase both the vibration of the diaphragm and make the speaker thinner. According to this, even when the speaker is made thin along the vibration direction of the diaphragm, the vibration of the voice coil can be increased within a predetermined range.

  A speaker device provided with such a vibration direction converter uses a flat voice coil, and the reaction force generated by the vibration of the diaphragm acts on the flat voice coil in a direction crossing its own vibration direction. Therefore, it is required that the voice coil does not bend against this reaction force.

  At this time, it is conceivable to make the member that supports the voice coil thick so that it is difficult to bend. However, if the thickness of the member that supports the voice coil is increased, the gap between the magnetic gaps in which the voice coil is disposed increases. Since this affects the thickness in the direction, it is contrary to the requirement of this type of speaker device aiming at thinning of the speaker device.

This invention makes it an example of a subject to cope with such a problem. That is, in the speaker device including the vibration direction conversion unit, it is possible to suppress the bending generated in the voice coil due to the vibration reaction force of the diaphragm while reducing the thickness of the sound emission direction of the speaker device. It is.

In order to achieve such an object, the speaker device according to the present invention has at least the following configuration.
A flat voice coil that can freely vibrate in a uniaxial direction, a magnetic circuit having a magnetic gap in which the voice coil is disposed, a diaphragm that vibrates in a direction different from the voice coil, and vibration of the voice coil in the uniaxial direction A rigid vibration direction converting portion that transmits to the diaphragm that vibrates in a direction different from the direction, and the voice coil or the voice coil support portion that supports the voice coil has both sides along the one-axis direction as the magnetic field. A speaker device, wherein the speaker device is provided outside the gap, and a reinforcing portion for reinforcing the voice coil or the voice coil support portion is provided on both side portions.

It is explanatory drawing which showed the basic composition of the speaker apparatus in embodiment of this invention (the figure (a) is sectional drawing along the X-axis direction, the figure (b) is explanatory drawing which showed operation | movement of the drive part). . It is explanatory drawing which showed the example of various forms of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the other example of a vibration direction conversion part. It is explanatory drawing which shows the other example of a vibration direction conversion part. It is explanatory drawing explaining the drive part of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the drive part of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing explaining the drive part of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of the form of the reinforcement part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of the form of the reinforcement part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of the form of the reinforcement part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of the form of the reinforcement part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of the form of the reinforcement part in the speaker apparatus which concerns on embodiment of this invention (FIG. 12 (a) is the figure which planarly viewed the voice carp vibration body, FIG.12 (b) is a voice coil vibration body. This is a side view.) It is explanatory drawing which showed the specific example of the reinforcement part in the speaker apparatus which concerns on embodiment of this invention (FIG. 13 (a) is a top view, FIG.13 (b) is a fragmentary sectional view of a reinforcement part). It is explanatory drawing which showed the example of application of the speaker apparatus which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto. In the following description of each drawing, parts that are common to the parts that have already been described are assigned the same reference numerals, and duplicate descriptions are partially omitted.

  1A and 1B are explanatory views showing a basic configuration of a speaker device according to an embodiment of the present invention (FIG. 1A is a cross-sectional view along the X-axis direction, and FIG. 1B shows an operation of a drive unit. Illustration). The speaker device 1 includes a stationary unit 100 and a vibrating unit 200 that vibrates with respect to the stationary unit.

  The stationary part 100 is a general term for parts that support the vibration of the diaphragm 10 and the voice coil 30, and in the illustrated example, the frame 12, the magnetic circuit 20 that also functions as the frame 12, and the like correspond to the stationary part 100. The stationary part 100 is not intended to be completely stationary per se, and the entire stationary part 100 vibrates under the influence of vibrations of the diaphragm 10 and the voice coil 30 or other forces. It may be a thing. The magnetic circuit 20 includes a magnetic gap 20G in which the voice coil 30 is disposed.

  The vibration part 200 is a part that vibrates relative to the stationary part 100 due to the vibration of the voice coil 30, such as the diaphragm 10, the voice coil 30, the voice coil support part 40, the vibration direction conversion part 50, and the connection part 60. . The voice coil 30 has a flat plate shape, and receives an electric signal (audio signal) and vibrates in a direction different from that of the diaphragm 10. The vibration direction converter 50 is a rigid part that transmits the vibration of the voice coil 30 to the diaphragm 10 that vibrates in a direction different from the vibration. In the drawing, the voice coil 30 is supported by the voice coil support unit 40, but the voice coil 30 itself may be connected to the vibration direction conversion unit 50. Here, the vibration direction of the voice coil 30 is defined as the X-axis direction, and the two directions orthogonal thereto are defined as the Y-axis direction and the Z-axis direction, respectively. The outer peripheral portion of the diaphragm 10 is supported by a frame 12 that is a stationary portion 100 via an edge 11. The voice coil 30 and the magnetic circuit 20 constitute the drive unit 14 of the speaker device 1.

  The diaphragm 10 may have a substantially rectangular shape in plan view, or may have a circular shape, an elliptical shape, or other shapes. Moreover, the cross-sectional shape of the diaphragm 10 can be formed in a predetermined shape such as a flat plate shape, a dome shape, or a cone shape, for example. In the illustrated example, the cross-sectional shape of the diaphragm 10 is a plane, but may be a curved shape. Moreover, if necessary, the overall height of the diaphragm 10 may be made relatively small, and the speaker device 1 may be thinned.

  In the drive unit 14, the voice coil 30 vibrates in a uniaxial direction along the magnetic gap 20 </ b> G of the magnetic circuit 20, and the vibration direction conversion unit 50 changes the direction and transmits the vibration to the diaphragm 10. In the illustrated example, the voice coil 30 vibrates along the X-axis direction, and the diaphragm 10 is arranged so as to vibrate in the Z-axis direction perpendicular to the X-axis direction. The diaphragm 10 is vibrated in the Z-axis direction by converting the vibration in the direction into a changing oblique angle.

  The magnetic circuit 20 includes a magnet 21 (21A, 21B) and a magnetic pole member (yoke part) 22 (22A, 22B) so that a plurality of magnetic gaps 20G are arranged along the vibration direction (for example, the X-axis direction) of the voice coil 30. It has. Here, the magnetic pole directions of the magnets 21 (21A, 21B) are set so that the magnetic field directions of the pair of magnetic gaps 20G are opposite to each other (± Z-axis direction), and the magnetic gaps having magnetic fields in the opposite directions. By arranging the voice coil 30 around which the conductive member is wound so that currents in opposite directions (± Y-axis direction) flow with respect to 20G, a direction along the magnetic gap 20G (± X-axis) is arranged in the voice coil 30. Direction) driving force (Lorentz force, electromagnetic force). The arrangement relationship between the magnet 21 and the magnetic pole member (yoke part) 22 is not limited to the illustrated example. By forming the voice coil support portion 40 with, for example, a flat insulating member, rigidity (including bending rigidity and torsional rigidity) can be added to the entire voice coil 30.

  The vibration direction conversion unit 50 converts vibrations in one axial direction into vibrations in a direction different from the vibration direction, and one end thereof is connected to the voice coil 30 directly or via another member so that the angle can be changed. In addition, the other end is connected to the diaphragm 10 directly or via another member so that the angle can be freely changed, and is disposed obliquely with respect to the vibration direction of the diaphragm 10 and the vibration direction of the voice coil 30. . That is, the vibration direction conversion part 50 is formed at the both ends of the link part 51, the rigid link part 51 that is obliquely provided so that the angle can be freely changed between the voice coil 30 or the voice coil support part 40 and the diaphragm 10. And a joint portion 52 serving as a fulcrum for the angle change of the vibration direction converter 50.

In the illustrated example, the connecting portion 53 (53A) at one end of the vibration direction changing portion 50 is connected to the voice coil 30 or the voice coil support portion 40 via the connecting portion 60, but directly without using the connecting portion 60. You may connect. The connecting portion 60 is formed between the end portion on the voice coil side of the vibration direction converting portion 50 and the end portion on the vibration direction changing portion side of the voice coil 30 or the voice coil support portion 40, and both ends thereof in the vibration direction. They are connected at intervals along the line. The connecting part 60 absorbs the thickness of the magnetic circuit 20 to reduce the thickness of the speaker device.

  A contact avoiding portion 70 that avoids contact with the joint portion 52 is formed at a portion close to the joint portion 52 of the vibration direction converting portion 50. The contact avoiding unit 70 also functions as a joining member accommodating portion (constraining portion) that accommodates and restrains the joining member that joins the vibration direction converting portion 50. The contact avoiding portion 70 is formed in a concave shape along the joint portion 52, for example, a concave portion, a notch portion, a groove portion, or the like, and the joint portion 52 and the surface of the attachment site disposed in the vicinity of the joint portion 52 A predetermined space is formed between the joint portion 52 and the adhesive member interposed between the vibration direction changing portion 50 and the attachment site. In the illustrated example, a notch 71 is formed as a contact avoiding portion 70 in the connecting portion 60 so as to be close to the joint portion 52 (52A), and a concave portion 72 is formed as a contact avoiding portion 70 in the diaphragm 10 in the joint portion 52 (52B). It is formed so as to be close to. Thereby, when the connection part 53 of the vibration direction conversion part 50 and the end surface of the connection part 60 or the diaphragm 10 are bonded together with a bonding member such as an adhesive or a double-sided tape, the adhesive protrudes toward the joint part 52. In addition, the end portion of the double-sided tape enters the cutout portion 71 or the concave portion 72 so that the joint portion 52 does not come into contact with the end portion.

  As shown in FIG. 6A, such a speaker device 1 inputs a voice signal SS as an electrical signal to the voice coil 30 of the drive unit 14, thereby providing a magnetic signal as shown in FIG. The voice coil 30 or the voice coil support portion 40 vibrates in the X-axis direction shown in the figure along the magnetic gap 20G of the circuit 20, for example. As a result, the vibration is changed in direction by the vibration direction converter 50 and transmitted to the diaphragm 10, and the diaphragm 10 is vibrated in, for example, the Z-axis direction shown in FIG. A corresponding sound is emitted.

  According to such a speaker device 1, since the vibration direction of the voice coil 30 and the vibration direction of the diaphragm 10 are made different by the vibration direction conversion unit 50, the voice coil 30 is moved along the vibration direction of the diaphragm 10. Compared to the case of vibrating, the back side of the diaphragm 10 can be made thinner. As a result, a thin speaker device capable of reproducing the low sound range with high sound pressure can be obtained.

  Furthermore, since the vibration of the voice coil 30 is redirected by the vibration direction converter 50 and transmitted to the diaphragm 10, the speaker device 1 can be increased even if the amplitude of the diaphragm 10 is increased by increasing the amplitude of the voice coil 30. The thickness in the acoustic radiation direction (the overall height of the speaker device) does not increase. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.

  FIG. 2 is an explanatory diagram showing various examples of the speaker device according to the embodiment of the present invention. In all the examples shown in FIG. 2, the vibration direction converter 50 forms a parallel link including a pair of link portions 51. In the example shown in FIG. 2A, the drive unit 14 drives one diaphragm 10 by a set of voice coil 30 and magnetic circuit 20. In the example shown in FIG. 2B, the drive unit 14 causes the pair of diaphragms 10 and 10 opposed to each other to vibrate in opposite directions by the pair of voice coils 30 and the magnetic circuit 20. In the example shown in FIG. 2C, the driving unit 14 vibrates one diaphragm 10 by the two voice coils 30 and 30 and the magnetic circuits 20 and 20 that are arranged to face each other. In the example shown in FIG. 2D, the drive unit 14 includes a pair of diaphragms 10 (10 </ b> A), which are opposed to each other by two voice coils 30, 30 and magnetic circuits 20, 20 which are opposed to each other. 10 (10B) are vibrated in opposite directions. In the example shown in FIGS. 2A and 2C, the diaphragm 10 is driven on one side, and a unidirectional sound can be emitted. In the example shown in FIG. 2B and FIG. 2D, the diaphragm 10 is driven on both sides, and omnidirectional sound can be emitted.

FIG. 3 is an explanatory diagram illustrating another example of the vibration direction conversion unit 50. The vibration direction conversion unit 50 (link mechanism 50L) shown in FIG. 3 is used in the embodiment of FIG. 2 (c) in which a pair of drive units are provided and the vibration direction conversion units 50 are arranged so as to face each other substantially symmetrically. is there.

  The vibration direction converter 50 has one end as a joint portion 52A (R), 52A (L) with the first connection portion 53A (R), 53A (L) and the other end as a joint with the second connection portion 53B. A pair of first link portions 51A (R) and 51A (L) are provided as portions 52B (R) and 52B (L). Also, one end is a joint part 52C (R), 52C (L) with the intermediate part of the first link parts 51A (R), 51A (L), and the other end is a joint part 52D ( R) and 52D (L) have a pair of second link portions 51B (R) and 51B (L). As described above, the first connecting portion 53A is connected to the voice coil 30 or the voice coil support portion 40 directly or via the connecting portion 60 as another member, and the second connecting portion 53B is connected to the diaphragm 10. The stationary connection portion 53 </ b> C is connected to the bottom portion of the frame 12 that becomes the stationary portion 100, the yoke portion 22 that forms the magnetic circuit 20, and the like.

  Further, joint portions 52E (R) and 52E () with a pair of connection portions 53D (R) and 53D (L) whose one ends extend integrally from the first connection portions 53A (R) and 53A (L). L) and the other end of the third link portion 51C (R), (L) is the joint portion 52F (R), 52F (L) with the second connecting portion 53B and the connecting portion 53E integrated. Have.

  The first link portion 51A (R), the third link portion 51C (R), the first link portion 51A (L), the third link portion 51C (L), and the second link portion 51B (R ) And the third link portion 51C (L), and the second link portion 51B (L) and the third link portion 51C (R) form a parallel link.

  In the illustrated example, the second connecting portion 53B disposed in the vicinity of the joint portions 52F (R) and 52F (L) and the pair disposed in the vicinity of the joint portions 52A (R) and 52A (L). In the connecting portions 53D (R) and 53D (L), a recess 76 is formed as the contact avoiding portion 70 so that a space is formed between each joint portion and the connecting portion.

  In the vibration direction conversion unit 50, the stationary connection portion 53 </ b> C supported by the frame 12 functions as the stationary unit 100. According to such a vibration direction conversion unit 50, when the joint portions 52A (R) and (L) move so as to be close to each other in the X-axis direction due to the vibration of the voice coil support unit 40, the parallel link mechanism causes the second The connecting portion 53B and the connecting portion 53E integrated therewith rise while maintaining a parallel state, and the first link portions 51A (R), (L) and the third link portion 51C (R) forming a parallel link. , (L) is changed so that the angle rises. At this time, since the joint portions 52D (L) and (R) are supported at both ends of the stationary connection portion 53C that becomes the stationary portion, the first link portion 51A (R) receives the reaction force from the stationary portion. , (L) and the third link portions 51C (R), (L) are reliably changed, and the displacement of the joint portions 52A (R), (L) is reliably converted into the displacement of the diaphragm 10. .

  Similarly, when the joint portions 52A (R) and (L) move away from each other in the X-axis direction, the second link portion 53B and the link portion 53E integrated therewith are lowered by the parallel link mechanism while maintaining the parallel state. The angle is changed so that the first link portions 51A (R), (L) and the third link portions 51C (R), (L) forming the parallel links are tilted. At this time, since the joint portions 52D (R) and (L) are supported by the stationary portion, the first link portions 51A (R) and (L) and the third link receive the reaction force from the stationary portion. The angle of the portions 51C (R) and (L) is reliably changed, and the displacement of the joint portions 52A (R) and (L) is reliably converted into the displacement of the diaphragm 10.

  According to such a vibration direction conversion unit 50, the joint portions 52B (R), (L), 52F (R) in which vibration in the X-axis direction of one voice coil support unit 40 vibrates with substantially the same phase and substantially the same amplitude. , (L) and the second connecting portion 53B are converted into vibrations in the Z-axis direction. As a result, the diaphragm 10 is supported in a wide range and is provided with vibrations having substantially the same phase and substantially the same amplitude. Therefore, the vibration of the voice coil support unit 40 with respect to the planar diaphragm 10 having a large area is provided. Can be transmitted in substantially the same phase.

  In the vibration direction conversion unit 50, the connecting portions 53B, 53D (R), (L), and the third link portions 51C (R), (L) are arranged in parallel in a pair in the width direction, and the first link The portions 51A (R) and (L) are formed in a bifurcated portion, and joint portions 52C (R) and (L) with the second link portions 51B (R) and (L) are formed in the middle portion thereof. The link portions 51B (R), (L) and the connection portion 53C of the link portions 53B, 53D (R), (L), the third link portions 51C (R), ( L). By forming the link portion with a single sheet-like (plate-like) component in this way, the diaphragm 10 can be supported and vibrated on the surface, so that the entire diaphragm 10 can be vibrated substantially in phase. It is possible to suppress divided vibration.

  Moreover, the vibration direction conversion part 50 of this form refracts the whole one plate-shaped member which forms a link part to convex base shape, and 1st link part 51A (R), (L) and 2nd connection part. 53B is formed, and this plate-like member is partially cut out and refracted into a concave shape to form the second link portions 51B (R) and (L) and the stationary connection portion 53C.

  The vibration direction conversion unit 50 can form a link mechanism of the vibration direction conversion unit 50 by using one integral part for the two opposing voice coil support units 40. Even when the provided speaker device is formed, the assembling work can be easily performed. Further, by providing the immovable connecting portion 53C, the joint portion 52D (particularly with respect to the opposing vibration of the voice coil support portion 40 (the plurality of voice coil support portions 40 vibrate in opposite directions to each other). Even if the frames R) and (L) are not supported by the frame 12, the positions of the joint portions 52D (R) and (L) are held constant. Can be simplified.

  As a link mechanism, the right first link portion 51A (R) and the third link portion 51C (R), and the left first link portion 51A (L) and the third link portion 51C (L). Since the parallel link is formed, the second connecting portion 53B fixed to the diaphragm 10 can be stably translated along the Z-axis direction with respect to the opposing vibration of the voice coil support portion 40. As a result, it is possible to apply stable vibration to the planar diaphragm 10.

  In the example shown in FIG. 3A, the convex portion 510 is provided on the link portion where bending is likely to occur due to the opposing vibration of the voice coil support portion 40 to increase the rigidity. In the illustrated example, the first link portions 51A (R), (L), the second link portions 51B (R), (L), the connecting portions 53D (R), (L), and the connecting portions 53C are convex. A portion 510 is provided. Further, in the example shown in FIG. 3B, an opening 520 is provided in a link portion that does not particularly require strength, thereby reducing the weight of the vibration direction changing portion. In the illustrated example, an opening 520 is provided in the connecting portion 53B. The weight reduction of the vibration direction converter is particularly effective in widening the reproduction frequency band and increasing the amplitude and sound pressure level of the sound wave for a predetermined audio current.

  FIG. 4 is an explanatory diagram illustrating another example of the vibration direction converter 50. The vibration direction conversion unit 50 shown in FIG. 4 is provided with a pair of drive units, the vibration direction conversion units 50 are arranged opposite to each other substantially symmetrically, and the pair of vibration plates vibrate in different directions. There are those used in the embodiment.

  In FIG. 2D, the vibration direction conversion unit 50 is configured such that the pair of voice coils 30 and 30 approaches or separates along the X-axis direction, and the first diaphragm 10A and the second diaphragm 10B are Z. It transforms into vibration that approaches or separates along the axial direction. The vibration direction converter 50 shown in FIG. 4 is a combination of the first vibration direction converter 50A that vibrates the first diaphragm 10A and the second vibration direction converter 50B that vibrates the second diaphragm 10B. ing.

The first vibration direction converter 50A is connected to the first diaphragm 10A and extends along the X-axis direction, and a pair of voice coils 30 disposed along the X-axis direction. , 30 and voice coil side connecting portions 50b, 50b connected to each of them, and a plurality of link portions 50c (a pair of links in the illustrated example) provided between the diaphragm side connecting portion 50a and each voice coil side connecting portion 50b. Link portions 50c, 50c) and a joint portion 50d for connecting the end portion of the link portion 50c and the end portion of the diaphragm side connecting portion 50a or the voice coil side connecting portion 50b. The diaphragm side connecting portion 50a and the voice coil side connecting portion 50b are arranged substantially in parallel. The pair of link portions 50c are substantially symmetrical with respect to the Z-axis (axis along the vibration direction of the diaphragm 20). The first vibration direction conversion unit 50A and the second vibration direction conversion unit 50B are disposed substantially symmetrically with respect to the X axis. The second vibration direction converter 50B includes a diaphragm side connecting portion 50a connected to the second diaphragm 10A and a plurality of voice coil side connecting portions 50b (in the example shown, a pair of voice coil side connecting portions 50b and 50b). ), A plurality of link portions 50c (a pair of link portions 50c and 50c in the illustrated example), and a plurality of joint portions 50d. The diaphragm-side coupling portion 50 a is provided with a fitting convex portion 55 that is fitted into the fitting hole of the diaphragm 10.

  In the first vibration direction conversion unit 50A and the second vibration direction conversion unit 50B, the plurality of link portions 50c are in the Y-axis direction (directions that intersect the vibration direction of the voice coil 31 and the vibration direction of the diaphragm 20 respectively). Are arranged in parallel with a predetermined interval. And the some link part 50c of the 2nd vibration direction conversion part 50B is arrange | positioned between the some link parts 50c of 50 A of 1st vibration direction conversion parts. The voice coil side connecting portion 50b of the first vibration direction conversion section 50A is disposed on the second diaphragm 10B side with respect to the voice coil 30 or the voice coil support section 40, and the voice coil of the second vibration direction conversion section 50B. The side connection portion 50b is disposed on the first diaphragm 10A side with respect to the voice coil 30 or the voice coil support portion 40.

  According to this, the link portion 50c of the first vibration direction conversion section 50A and the link portion 50c of the second vibration direction conversion section 50B that are arranged in parallel in the Y-axis direction are in an intersecting state, and the first vibration direction The voice coil side connection portion 50b of the conversion unit 50A is disposed between the second diaphragm 10B and the voice coil side connection portion 50b of the second vibration direction conversion unit 50B, and the second vibration direction conversion unit 50B. The voice coil side connecting portion 50b is disposed between the first diaphragm 10A and the voice coil side connecting portion 50b of the first vibration direction changing portion 50A.

  The vibration direction conversion unit 50 includes a columnar portion side connecting portion 50f that is directly connected to a columnar portion (not shown) of the stationary portion or connected (directly connected) via another member. In the link portion 50c of the vibration direction converting portion 50, the inclination angle of the link portion 50c (eg, the angle formed by the link portion 50c and the X-axis direction) is changed by the vibration of the voice coil 30 and the reaction force received from the columnar portion. The columnar part of the stationary part is arranged between the columnar part side connecting part 50f of the first vibration direction converting part 50A and the columnar part side connecting part 50f of the second vibration direction converting part 50B. Further, the columnar part 10B of the stationary part 10 is disposed between the voice coil side connection part 50b of the first vibration direction conversion part 50A and the voice coil side connection part 50b of the second vibration direction conversion part 50B. .

  The voice coil side connecting portion 50 b and the link portion 50 c extend along the vibration direction (X-axis direction) of the voice coil 31 and protrude toward the first diaphragm 21 or the second diaphragm 22. 54. The protrusion 54 is formed continuously from one end of the link portion 50c to the other end.

  By providing such a protruding portion 54, the voice coil side connecting portion 50 b and the link portion 50 c have rigidity with respect to the vibration direction of the voice coil 31. The diaphragm-side connecting portion 50a is provided with necessary rigidity by attaching the diaphragm-side connecting portion 50a itself to the diaphragm 20. Moreover, since the protrusion part 54 raises the rigidity of the link part 50c etc., since it protrudes partially, the mass increase of the link part 50c etc. can be suppressed.

  The height of the voice coil side connection portion 50b of the first vibration direction conversion portion 50A and the height of the voice coil side connection portion 50b of the second vibration direction conversion portion 50B in the vibration direction (Z-axis direction) of the diaphragm 20 This difference can be set to a desired size by using a connecting member (not shown). Specifically, by making this difference relatively large, the amplitude of the diaphragm 20 can be made relatively large while making the speaker device 1 thinner. Further, by providing this difference, a part of the thickness of the magnetic circuit 40 in the vibration direction of the diaphragm 20 can be overlapped in the difference, so that the speaker device 1 is thinned and used for the magnetic circuit 40. The thickness of the magnet 41 can be made relatively large, and the electromagnetic force acting on the voice coil 31 can be made relatively large.

  The connecting member includes the voice coil 30 or the voice coil support portion 40, the voice coil side connecting portion 50b of the first vibration direction changing portion 50A, and the voice coil side connecting portion 50b of the second vibration direction changing portion 50B. It is the member which has connected. The connecting member is a spacer that fills the gap between the voice coil side connecting portion 50b of the first vibration direction changing portion 50A and the voice coil side connecting portion 50b of the second vibration direction changing portion 50B arranged at different positions. The voice coil side connecting portion 50b of the first vibration direction converting portion 50A and the voice coil side connecting portion 50b of the second vibration direction converting portion 50B are disposed.

  5-7 is explanatory drawing explaining the drive part of the speaker apparatus based on embodiment of this invention. Here, the voice coil 30 and the voice coil support portion 40 constitute a flat voice coil vibrating body 41. The voice coil vibrating body 41 can be configured by only the voice coil 30, and can also be configured by supporting the voice coil 30 on the voice coil support portion 40 as shown in the figure.

  The magnetic circuit 20 for vibrating the voice coil vibrating body 41 is formed by a magnet 21 and a yoke portion 22, and has a pair of magnetic gaps 20G (20G1, 20G2) having magnetic field directions opposite to each other in the Z-axis direction. They are arranged side by side at a predetermined interval in the X-axis direction. Then, by winding the voice coil 30 so that the currents flowing in the magnetic gap 20G (20G1, 20G2) are opposite to each other in the Y-axis direction, the Lorentz force along the X-axis direction acts on the voice coil 30. I have to. In the illustrated example, the voice coil 30 has a pair of linear portions 30A and 30C, and the voice coil 30 has a pair of magnetic portions so that reverse current flows through the linear portions 30A and 30C through the pair of magnetic gaps 20G1 and 20G2. It arrange | positions so that the gaps 20G1 and 20G2 may be circulated.

  By changing the arrangement of the magnet 21 and the yoke portion 22, various forms of the magnetic circuit 20 can be formed with the same function. In the example illustrated in FIG. 6, the magnetic circuit 20 includes a plurality of magnets 21 (21A to 21D). In the magnetic circuit 20, the magnets 21 are provided on both sides along the direction of the magnetic field of the magnetic gap 20G.

  In the illustrated example, the yoke portion 22 includes a lower yoke portion 22A, an upper yoke portion 22B, and a column portion 22C. The yoke portions 22A and 22B are disposed substantially parallel to each other with a specified interval, and the column portion 22C is formed at the center portion so as to extend in a direction substantially orthogonal to the yoke portions 22A and 22B. .

  Magnets 21A to 21D are disposed in the yoke portions 22A and 22B, and one magnetic gap 20G2 is formed by the magnet 21A and the magnet 21C, and another magnetic gap 20G1 is formed by the magnet 21B and the magnet 21D. The pair of magnetic gaps 20G1 and 20G2 are formed side by side in a plane, and magnetic fields in opposite directions are formed.

  The voice coil 30 is formed in a substantially rectangular planar shape, and is composed of straight portions 30A and 30C formed along the Y-axis direction and straight portions 30B and 30D formed along the X-axis direction. ing. The straight portions 30A and 30C of the voice coil 30 are arranged in the magnetic gap 20G of the magnetic circuit 20, and are defined so that the direction of the magnetic field is along the Z-axis direction. It is preferable not to apply a magnetic field to the straight portions 30B and 30D of the voice coil 30. Further, even when a magnetic field is applied to the straight portions 30B and 30D, the Lorentz forces generated in the straight portions 30B and 30D are configured to cancel each other. The voice coil 30 can have a relatively large portion in the magnetic gap 20G by relatively increasing the number of turns, and can obtain a relatively large driving force when the speaker is driven.

  In the example shown in FIG. 6, the magnetic circuit 20 includes a plurality of magnets 21 </ b> A to 21 </ b> D such that the direction of the magnetic field related to the straight part 30 </ b> A of the voice coil 30 is opposite to the direction of the magnetic field related to the straight part 30 </ b> C. On the other hand, the magnet 21A and the magnet 21C are magnetized in the same direction, and the magnet 21B and the magnet 21D are magnetized in the opposite direction. On the other hand, in the example shown in FIG. 7, the magnetic gap 20G2 is formed by magnets 21A and 21C magnetized in the same direction, and the magnetic gap 20G1 is formed on the yoke protrusions 22a and 22B formed on the yoke portions 22A and 22B, respectively. It is formed between 22b. According to this, the magnetizing process performed after assembling the magnet 21 and the yoke part 22 can be completed once, and the process can be simplified. Although not shown, the magnetic circuit 20 has a magnetic gap 20G1 and 20G2 both formed of a magnet and a yoke protrusion, or one of the magnetic gaps 20G1 and 20G2 is formed of a magnet and a yoke, and the other May be composed of two magnets or two yoke portions.

  In the voice coil vibrating body 41 (voice coil 30 or voice coil support portion 40), both side portions along the vibration direction (X-axis direction) of the voice coil 30 are disposed outside the magnetic gap 20G. The reinforcing portions 300 that reinforce the voice coil vibrating body 41 are provided on both sides of the voice coil vibrating body 41. The reinforcing portion 300 suppresses the bending due to the vibration reaction force of the diaphragm 10 in the voice coil vibrating body 41 and the bending due to the natural mode vibration of the voice coil 30. In the example shown in FIG. 5, the reinforcing portion 300 is configured by mounting the reinforcing member 301 on both sides of the voice coil vibrating body 41. The reinforcing member 301 is mounted outside the magnetic gap 20G so as to cover both sides of the voice coil vibrating body 41 and extend in one axial direction (X-axis direction).

  8-12 is explanatory drawing which showed the form example of the reinforcement part in the speaker apparatus based on embodiment of this invention. Parts common to the form examples in the respective drawings are denoted by the same reference numerals, and redundant description is omitted.

In the embodiment shown in FIG. 8, the reinforcing portions 300 are provided on both side portions along the X-axis direction of the voice coil vibrating body 41 (voice coil 30 or voice coil support portion 40) disposed outside the magnetic gap 20G. One end of the holding portion 15 that holds the voice coil vibrating body 41 (the voice coil 30 or the voice coil supporting portion 40) on the stationary portion 100 so as to freely vibrate is connected to the voice coil vibrating body 41 via the reinforcing portion 300. ing. The reinforcing part 300 may be provided only in the vibration direction (X-axis direction) of the voice coil 30, but in addition to this, the Y-axis direction of the voice coil vibrating body 41 (direction intersecting with the vibration direction of the voice coil 30). You may provide in the side part. The side part in the Y-axis direction where the reinforcing part 300 is provided is also arranged outside the magnetic gap 20G. In the illustrated example, a conductive wiring 43 that is drawn from both ends of the voice coil 30 is provided on the surface of the voice coil vibrating body 41.

  In the embodiment shown in FIG. 9 (FIG. 9A is a plan view and FIGS. 9B1 and 9B2 are XX cross-sectional views), the reinforcing portion 300 is at least one of both side portions of the voice coil vibrating body 41. The reinforcing member is mounted so as to cover the one surface and extend in the uniaxial direction (X-axis direction). A part of the reinforcing portion (reinforcing member) 300 is provided on the conductive wiring 43 that passes through both side portions of the voice coil vibrating body 41 and is drawn from the voice coil 30. The reinforcing portion (reinforcing member) 300 may be attached to one side of the voice coil vibrating body 41 as shown in FIG. 9 (b1), or both sides of the voice coil vibrating body 41 as shown in FIG. 9 (b2). It may be attached to. The reinforcing portion (reinforcing member) 300 can be formed of an insulating member such as resin, rubber, or paper. Further, when the conductive wiring 43 is insulated and coated by itself, it can be formed of a non-magnetized metal or alloy.

Reinforcing section 300, the direction of the thickness t1, t2 which intersects the X-axis direction in the both side portions of the voice coil vibration member 41 comprising a reinforcing portion 300 is set to be larger than the interval t _G of the magnetic gap 20G be able to. In this way, the reinforcing effect can be increased by increasing the thicknesses t1 and t2. Since the even by increasing the thickness t1, t2 does not affect the interval t _G of the magnetic gap 20G, it is possible to reinforce the voice coil vibrator 41 independently of the thickness of the speaker apparatus.

  In the embodiment shown in FIG. 10, the voice coil vibrating body 41 (voice coil 30 or voice coil support portion 40) is connected to the vibration direction changing portion 50 via the connecting portion 60, and the reinforcing portion 300 is in the X-axis direction. It connects with the connection part 60 in the edge part. In the illustrated example, the reinforcing portion 300 is configured integrally with the connecting portion, and the connecting portion 60 functions as the reinforcing portion 300 along the Y-axis direction of the voice coil vibrating body 41.

  In the embodiment shown in FIG. 11, the voice coil vibrating body 41 (voice coil 30 or voice coil support portion 40) and the vibration direction converting portion 50 are integrally formed, and the reinforcing portion 300 is an end portion in the X-axis direction. The vibration direction converter 50 is connected. In the illustrated example, the reinforcing portion 300 formed integrally with the vibration direction converting portion 50 functions as the reinforcing portion 300 along the Y-axis direction of the voice coil vibrating body 41.

  In the embodiment shown in FIG. 12, the reinforcing portion 300 is configured by a folded portion 302 that is folded on both sides of the voice coil vibrating body 41 along a broken line along the X-axis direction (FIG. 12A is a voice coil). FIG. 12 is a plan view of the vibrating body 41, and FIG. 12B is a side view of the voice coil vibrating body 41. The folded portion 302 may be formed by processing both side ends of the voice coil support portion 40 into an L shape, or by attaching L-shaped reinforcing members to both sides of the voice coil support portion 40. Also good. Further, the folded portion 302 may be provided together with the side portion of the voice coil support portion 40 along the Y-axis direction.

  FIG. 13 is an explanatory view showing a specific example of the reinforcing portion in the speaker device according to the embodiment of the present invention (FIG. 13A is a plan view, and FIG. 13B is a partial cross-sectional view of the reinforcing portion). In the illustrated example, the reinforcing portion 300 is configured by a reinforcing member 302 that is mounted so as to cover both sides of the voice coil vibrating body 41 (voice coil 30 or voice coil support portion 40) and extend in the X-axis direction. The reinforcing member 302 has a thinned truss shape. According to this, the truss shape can reduce the weight of the reinforcing member 302 and can effectively suppress the bending of the voice coil vibrating body 41 due to the vibration reaction force of the diaphragm.

  In the speaker device 1 according to the embodiment of the present invention, the reinforcing part 300 is provided in the voice coil vibrating body 41 (the voice coil 30 or the voice coil support part 40), so that the vibration reaction force of the diaphragm 10 and the voice coil 30 can be reduced. Even when the force due to the natural mode vibration acts in a direction different from the vibration direction of the voice coil vibrating body 41, the bending rigidity of the voice coil vibrating body 41 can be secured, and the vibration of the voice coil 30 can be efficiently performed in the vibration direction. This can be communicated to the conversion unit 50.

  The voice coil vibrating body 41 has both side portions along the vibration direction arranged outside the magnetic gap 20G, and the reinforcing portions 300 are provided on both side portions outside the magnetic gap 20G. Does not interfere with the magnetic gap 20G, and the magnetic gap 20G can be made as narrow as possible to reduce the thickness of the speaker device 1.

  The reinforcing part 300 can be constituted by reinforcing members 301 and 303 attached to both side portions of the voice coil vibrating body 41, whereby the material of the member used for the voice coil vibrating body 41 can be arbitrarily selected. become. By forming the truss shape with the reinforcing member 303 being thinned, the weight of the reinforcing member 303 can be reduced, and the favorable vibration characteristics of the voice coil vibrating body 41 can be maintained even when the reinforcing member 303 is attached. it can.

  Further, the reinforcing part 300 can be constituted by folded portions 302 provided on both sides of the voice coil vibrating body 41. In this example, it is possible to effectively impart bending rigidity to the voice coil vibrating body 41 without adding another member to the voice coil vibrating body 41.

  As described above, the speaker device according to the embodiment of the present invention can be reduced in thickness and can be increased in volume. Such a speaker device can be effectively used for various electronic devices and in-vehicle use. FIG. 14 is an explanatory diagram showing an application example of the speaker device according to the embodiment of the present invention. Since the electronic device 2 such as the flat panel display shown in FIG. 5A can reduce the thickness space necessary for installing the speaker device 1, the entire electronic device can be thinned. In addition, sufficient audio output can be obtained even in a thin electronic device. The speaker device may be attached to the back side of the flat panel display. FIG. 2B shows an automobile 3 provided with the speaker device according to the embodiment of the present invention. In the automobile 3 shown in the figure, the space in the vehicle can be expanded by making the speaker device 1 thinner. In particular, in the case where the speaker device 1 according to the embodiment of the present invention is installed in the door panel, the protrusion of the door panel is eliminated and the operation space for the driver can be expanded. In addition, since sufficient sound output can be obtained, music and radio broadcasting can be enjoyed comfortably in the car even during high-speed driving with a lot of noise.

  In addition, as a building equipped with the speaker device 1, a hotel, inn or training that can accommodate a large number of people, such as a house (building) intended for the residence of people, a meeting, a lecture, a party, etc. When the speaker device 1 is installed in a facility or the like (building), the thickness space necessary for the installation of the speaker device 1 can be reduced, so that unnecessary space can be deleted and the space can be used effectively. In recent years, with the widespread use of projectors and large-screen TVs, etc., there have been examples of providing living rooms with audio / video equipment, while living rooms without audio / video equipment have been provided. In some cases, etc. are used as theater rooms. Even in such a case, by using the speaker device 1, it is possible to easily convert a living room or the like into a theater room and to effectively use the space in the living room. Note that the speaker device 1 may be arranged at, for example, a ceiling or a wall in a living room.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. The embodiments described in the above drawings can be combined with each other as long as there is no particular contradiction or problem in the purpose, configuration, or the like. Moreover, the description content of each figure can become independent embodiment, respectively, and embodiment of this invention is not limited to one embodiment which combined each figure.

1: speaker device, 2: electronic equipment, 3: automobile,
10 :, diaphragm, 20: magnetic circuit, 20G: magnetic gap,
30: Voice coil, 40: Voice coil support part, 41: Voice coil vibrating body,
50: Vibration direction conversion unit,
300: Reinforcement part, 301, 303: Reinforcement member, 302: Folding part

Claims (16)

A flat voice coil that can vibrate in one axial direction;
A magnetic circuit comprising a magnetic gap in which the voice coil is disposed;
A diaphragm that vibrates in a different direction from the voice coil;
A rigid vibration direction converter that transmits the vibration of the voice coil to the diaphragm that vibrates in a direction different from the uniaxial direction,
The voice coil or the voice coil support portion that supports the voice coil is arranged on both sides along the uniaxial direction outside the magnetic gap,
A speaker device comprising a reinforcing portion for reinforcing the voice coil or the voice coil support portion on the both side portions.   The speaker device according to claim 1, wherein the reinforcing portion is configured by a reinforcing member that is attached so as to cover at least one surface of the both side portions and extend in the uniaxial direction.   The speaker device according to claim 2, wherein the reinforcing portion is configured by a reinforcing member that is mounted so as to cover the both side portions and extend in the uniaxial direction.   4. The speaker device according to claim 2, wherein the reinforcing member has a thinned truss shape.   The voice coil or the voice coil support part is connected to the vibration direction conversion part via a connection part, and the reinforcing part is connected to the connection part at an end in the uniaxial direction. The speaker apparatus in any one of Claims 1-4. The voice coil or the voice coil support part and the vibration direction conversion part are integrally formed,
The speaker device according to claim 1, wherein the reinforcing portion is connected to the vibration direction changing portion at an end portion in the uniaxial direction. The speaker device according to claim 1, wherein the reinforcing portion is configured by a folded portion in which the both side portions are folded along a fold line along the uniaxial direction. A holding part for holding the voice coil or the voice coil support part in a stationary part so as to vibrate freely;
The speaker device according to claim 1, wherein one end of the holding portion is connected to the voice coil or the voice coil support portion through the reinforcing portion.   The speaker device according to claim 1, wherein the reinforcing portion is provided on a side portion of the voice coil or the voice coil supporting portion that intersects the uniaxial direction.   The speaker device according to claim 1, wherein the reinforcing portion is made of an insulating member.   The speaker device according to claim 1, wherein a part of the reinforcing portion is provided on a conductive wiring of the voice coil that passes through the both side portions.   12. The speaker device according to claim 1, wherein a thickness in a direction intersecting the uniaxial direction at the both side portions including the reinforcing portion is larger than an interval of the magnetic gap.   An electronic apparatus comprising the speaker device according to claim 1.   An automobile comprising the speaker device according to claim 1.   A building comprising the speaker device according to claim 1. A vibration direction converter that converts vibration in one axial direction into vibration in a direction different from the one axial direction is provided, and vibration in one axial direction of the voice coil is vibrated in a direction different from the one axial direction through the vibration direction converter. A voice coil vibrating body for a speaker device, which is used in a speaker device for transmitting to a diaphragm that includes the voice coil and a voice coil support portion for supporting the voice coil;
The voice coil vibrating body for a speaker, wherein the voice coil supporting portion includes a reinforcing portion extending at least in a vibration direction of the voice coil or in a direction intersecting with the vibration direction.

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