JP2013102360A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-performance thin type speaker with high reproduction sound pressure level, which can be manufactured with less complication in those steps.SOLUTION: A speaker comprises: a diaphragm 2 supported by a frame 5 through an edge 3 provided around the diaphragm 2; a slender shaped coil bobbin 6 fixed onto a part of the diaphragm 2 and wound by a voice coil 7 around outer thereof; and yoke members 14, 15, 16 including magnetic gaps 17a, 17b which are linear, parallel to each other, and open at both ends. The speaker further comprises: a plurality of magnetic circuit units 10 placed in the frame 5, in which an intermediate part 18 of the coil bobbin 6 is arranged in the magnetic gaps 17a, 17b of the yoke members, while both ends 19 of the coil bobbin 6 are placed outside of the magnetic gaps; and a support member 8 connected to a lower part of each end of the coil bobbin 6 and to the frame 5, so as to support each coil bobbin 6.

Description

  The present invention relates to a speaker particularly suitable for low-pitched sound reproduction in an audio device such as a thin television or display.

  A thin television, a thin display, and the like often include a speaker for high sound, medium sound, and low sound as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2011-87146). This is because a thin television has a small speaker space and a small and thin speaker is preferably used. On the other hand, since this speaker cannot reproduce low sound clearly, a separate speaker for low sound is also used.

  In general, a low-frequency speaker has a large diaphragm, and the height dimension (dimension in the normal direction of the diaphragm) is often large according to the size of the cone-shaped diaphragm. For this reason, how to mount these large speakers in a limited space has been widely studied.

  For this reason, there is a need for a technique for making a low-frequency speaker whose thickness dimension tends to be large as thin as possible. For example, as disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2010-288088) and the like, a panel-type flat speaker is used.

  The flat speaker disclosed in Patent Document 2 provides a thin speaker without using a cone-shaped diaphragm. The planar speaker has a configuration in which linear excitation devices are attached in parallel to each other or a plurality of annular excitation devices are mounted on a substrate, and the low frequency of the sound generated by the vibration plate of the excitation device is low. Things are propagated to the substrate, and the substrate vibrates to reproduce low-pitched sound.

JP 2011-87146 A JP 2010-288088 A

  However, this flat speaker has a complicated structure because each vibration device has a magnet, a voice coil, a diaphragm and the like. In addition, since each vibration device is independently provided on the substrate, the power feeding structure to each vibration device becomes complicated, and there is a possibility that a deviation occurs in the supply of electric signals to the individual voice coils. Furthermore, since the configuration is such that the vibration apparatus having a complicated structure is supported only by the base, the substrate is required to have a considerable strength. As a result, there has been a problem that the sound at the time of low-frequency sound is unclear.

  In addition, since the vibration device itself is provided with a vibration plate and the vibration of the vibration device is propagated to the substrate, there is a problem that the vertical vibration of the substrate becomes unstable.

  Therefore, the technical problem to be solved by the present invention is to provide a thin speaker capable of reducing the labor of manufacture with a simple configuration and realizing high efficiency with a high reproduction sound pressure level.

  In order to solve the above technical problem, the present invention provides a speaker having the following configuration.

According to the first aspect of the present invention, the diaphragm supported by the frame via the edge provided around,
An intermediate portion of the coil bobbin having an elongated coil bobbin fixed to a part of the diaphragm and having a voice coil wound around an outer surface thereof, and a yoke member having a linear gap parallel to each other and having a magnetic gap open at both ends. Is disposed in the magnetic gap of the yoke member, while a plurality of magnetic circuit units disposed in the frame such that both ends are located outside the magnetic gap;
Provided is a speaker comprising: a support member that is connected to both lower ends of each of the coil bobbins and the frame and supports the coil bobbins.

  According to a second aspect of the present invention, there is provided the speaker according to the first aspect, wherein the diaphragm is substantially rectangular, and the coil bobbins are provided in parallel to each other.

  According to a third aspect of the present invention, the coil bobbin has a track shape in which longitudinal planes are parallel to each other and both end sides are formed as arcuate surfaces. I will provide a.

According to a fourth aspect of the present invention, the coil bobbin has a bottom wall provided with a protruding portion extending downward at both ends.
The frame includes a through hole at a position where the protrusion is provided,
The supporting member is provided on the outer bottom surface of the frame and is connected to the protruding portion through the through hole. The speaker according to any one of the first to third aspects is provided.

  According to the fifth aspect of the present invention, the support member has an outer part configured in a thin plate shape and connected to the frame, and an inner part provided with a fixing hole into which the protruding part is inserted, A speaker according to any one of the first to fourth aspects is provided, wherein the inner portion is configured to be displaced in the thickness direction of the outer portion.

  According to a sixth aspect of the present invention, there is provided the speaker according to the fifth aspect, wherein the support member has a connection portion that connects the outer portion and the inner portion.

According to the seventh aspect of the present invention, a plurality of yoke members provided in the magnetic circuit unit are provided intermittently,
The coil bobbin provides the speaker according to any one of the first to sixth aspects, wherein the coil bobbin includes a reinforcing member that connects a surface opposed in the short direction to a gap between the plurality of yoke members.

  According to the present invention, since the magnetic gap of the yoke member is a straight line parallel to each other with both ends open, it is possible to make the structure simple, and the adjustment of the gap with the voice coil is easy. The process can be facilitated. In addition, the coil bobbin has a long and narrow shape that faces parallel to the short direction, so that the driving force can be widely transmitted to the diaphragm, and the vibration linearity of the diaphragm increases. Can be suppressed.

  Furthermore, by supporting the lower portions at both ends of the coil bobbin with the support member, the distance between the diaphragm supporting the coil bobbin and the support member is increased, and the stability of the vertical vibration of the diaphragm can be improved. Therefore, the height dimension of the speaker can be reduced. Therefore, it is possible to provide a thin speaker having high input level and high input resistance. Also, by providing a plurality of magnetic circuit units, a large diaphragm can be driven efficiently, a speaker suitable for bass reproduction can be configured thinly with a simple configuration, and the reproduction sound pressure level can be reduced. High efficiency can be realized.

  According to the second aspect of the present invention, by providing the coil bobbin provided in parallel to the rectangular diaphragm, it is possible to efficiently give vibration to the entire diaphragm. Therefore, it is possible to reduce the thickness of a speaker suitable for low sound reproduction that can achieve high efficiency with a high reproduction sound pressure level.

  According to the fourth and fifth aspects of the present invention, the coil bobbin and the support member can be easily fixed, and the coil bobbin can be reinforced, so that the coil bobbin can be thinned and lightened. . Further, since the support member can be easily attached from the lower side, the assembling efficiency can be increased and the speaker can be miniaturized.

  According to the sixth aspect of the present invention, the support member can be configured in a thin plate shape, the mounting space for the support member provided on the lower side of the coil bobbin can be reduced, and the height dimension of the speaker can be reduced. .

It is a perspective view which shows the external appearance structure of the speaker concerning embodiment of this invention. It is a top view which shows the internal structure of the speaker of FIG. It is an assembly exploded view of the speaker of FIG. It is an assembly exploded view of the magnetic circuit unit of the speaker of FIG. It is sectional drawing in the AA of the speaker of FIG. It is sectional drawing in the BB line of the speaker of FIG. It is sectional drawing in the CC line of the speaker of FIG. It is an expanded sectional view of FIG. It is a partial expanded partial sectional view of the both ends vicinity of a coil bobbin. It is a figure which shows the other structure of a supporting member. It is a figure which shows the attachment structure of a supporting member and a flame | frame. It is a figure which shows the structure of the speaker concerning 2nd Embodiment of this invention, and is a top view which shows the example which attached four magnetic circuit units inside the flame | frame.

  Hereinafter, a speaker according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing an external configuration of a speaker according to an embodiment of the present invention. FIG. 2 is a plan view showing the internal structure of the speaker of FIG. 1, and shows a state in which the diaphragm is removed. The speaker 1 of the present invention is a speaker suitable for low-frequency reproduction used in electronic devices such as thin televisions that require a reduction in mounting space.

  The speaker 1 of this embodiment accommodates various members such as the magnetic circuit unit 10 in a substantially square frame 5 having a side of about 100 mm. A diaphragm 2 is provided on the upper surface of the frame 5.

  An edge 3 is bonded to the outer peripheral end of the diaphragm 2, and an upper frame 4 is provided on the outer peripheral side of the edge 3. The upper frame 4 is configured in a substantially square shape corresponding to the substantially square frame 5. In the present embodiment, the diaphragm 2, the edge 3, and the upper frame 4 are configured as separate members, but may be configured as a single member using a thin resin film or the like.

  The edge 3 is formed of a material having flexibility, and for example, foam rubber or the like is preferably used. The edge 3 supports the entire periphery of the diaphragm 2 so that the entire diaphragm 2 can integrally vibrate vertically.

  The upper frame 4 is a member that is provided around the edge 3 and connects the frame 5 and the diaphragm 2. The diaphragm 2 and the edge 3 are fixed to the upper surface of the frame 5 via the upper frame 4.

  The magnetic circuit unit 10 is composed of a yoke member and a coil member. The yoke member is fixed to the frame 5, the coil member is fixed to the diaphragm, and is supported from below by a support member 8 as will be described later. Yes.

  A pair of track-shaped coil bobbins 6, which are parts constituting the coil member of the magnetic circuit unit 10, are provided on the back surface of the diaphragm 2. In the present embodiment, the coil bobbin 6 is provided in parallel with each other along two opposing sides of the diaphragm 2.

  A voice coil 7 is wound around the side wall 6a of the track-shaped coil bobbin 6 over the entire circumference. The longitudinal length of the coil bobbin 6 is approximately 70 mm.

  The upper frame 4 of the diaphragm 2 is engaged with an opening provided above the frame 5. An opening portion of the frame 5 is provided with a diaphragm fixing portion 11 formed of a step having a shape corresponding to the diaphragm 2, and an attachment position between the diaphragm 2 and the frame 5 is specified.

  FIG. 3 is an exploded view of the speaker of FIG. FIG. 4 is an exploded view of the magnetic circuit unit of the speaker of FIG. 5 is a cross-sectional view taken along line AA of the speaker of FIG. 6 is a cross-sectional view taken along line BB of the speaker shown in FIG. 7 is a cross-sectional view taken along the line CC of the speaker shown in FIG.

  As shown in FIG. 3, the frame 5 of the speaker 1 according to the present embodiment is provided with a yoke fixing portion 30 for fixing the yoke member at a specific position and a terminal plate fixing portion 31 for fixing the terminal plate 9. ing. The yoke fixing portion 30 is composed of two standing walls for sandwiching the outside of the yoke 14 in the yoke member, and a protrusion 32 for engaging with the yoke 14 is provided on the inner surface. The yoke 14 is provided with an engagement hole 14 b that engages with the protrusion 32.

  The terminal plate fixing portion 31 includes a protrusion for locking the outer edge of the terminal plate 9 and fixes the terminal plate 9 to an intermediate portion between the two yoke members. The terminal board 9 is connected to the power line 33 and the coil lead wire 7 a from each magnetic circuit unit 10. The audio signal supplied from the power line 33 is sent to the coil lead wire 7a through the terminal board 9. A guide portion 34 for guiding and fixing the power line 33 to the bottom surface side of the frame is provided in the vicinity of the terminal plate fixing portion 31 of the frame 5.

  Support member arrangement holes 54 are provided on both ends of the yoke fixing portion 30. As will be described later, the support member arrangement hole 54 has a function of escaping so that the protruding portions 21 provided at both ends of the coil bobbin 6 do not interfere with the bottom wall of the frame. The support member 8 provided from the outside is positioned.

  As shown in FIG. 4, the yoke member includes an elongated yoke 14 fixed to a specific portion of the frame 5, a magnet 15 disposed at the bottom of the yoke 14, and a pole 16 provided on the magnet. It consists of and.

  The yoke 14 is made of a U-shaped magnetic metal, and a magnet 15 is disposed on the bottom surface 14a. The elongated magnet 15 is formed in an elongated shape, and the pole 16 has an elongated shape that is substantially the same shape as the magnet 15. Two magnets 15 and poles 16 are arranged in the yoke 14 with a gap 15a therebetween. In the gap 15a, a reinforcing member 20a of the coil bobbin 6 described later is disposed.

  Between the long side of the side surface of the yoke 14 and the long side of the side surface of the pole 16, linear magnetic gaps 17a and 17b having two sides that are parallel to each other are formed. Both ends of the magnetic gaps 17a and 17b are open, and the width dimension is configured to be about several millimeters although there are some differences depending on the size of the speaker.

  The magnet 15 of the present embodiment uses an Nd—Fe—B rare earth magnet having a large residual magnetization and a coercive force and a strong coercive force even in a small volume, but is not particularly limited, and is a ferrite magnet. Also good. The rare earth magnet is an Nd—Fe—B type neodymium magnet or an Sm—Co type samarium cobalt magnet, and is characterized in that the maximum energy product (BH) max of the magnet is a large value. .

  The coil bobbin 6 provided on the diaphragm 2 is a track-shaped cylindrical body, and can be manufactured by press-molding a light metal such as duralumin or aluminum, a heat-resistant resin film, or the like. In this embodiment, an aluminum press-processed product having a large heat dissipation effect is used. The coil bobbin 6 has a track shape in which an intermediate portion is a straight portion 18 and both end portions 19 have a semicircular shape. Two surfaces facing the short direction of the coil bobbin 6 constituting the straight portion 18 are parallel to each other.

  As shown in FIG. 6, a part of the linear portion 18 is disposed in the magnetic gaps 17 a and 17 b of the magnetic circuit unit 10, while the both end portions 19 are disposed outside the magnetic gaps 17 a and 17 b of the magnetic circuit unit 10. The By arranging only the straight portion 18 in the opposing magnetic gap of the magnetic circuit unit 10, the position adjustment between the magnetic gaps can be facilitated by the widths of the yoke 14 and the magnet 15.

  Further, since the linear portion 18 and the magnetic gaps 17a and 17b of the coil bobbin 6 are configured in parallel with each other, there is a slight deviation in the adjustment of the relative positional relationship between the magnetic circuit unit 10 and the voice coil 7 in the longitudinal direction. May be.

  The coil bobbin 6 is provided with a reinforcing member 20a at the center. The reinforcing member 20a connects the lower ends of the two linear portions 18 facing each other in order to prevent deformation of the track-shaped coil bobbin 6. As described above, since the magnet 15 and the pole 16 are divided into two parts, the reinforcing member 20 a is disposed in the gap 15 a between the two magnets 15 and the pole 16.

  FIG. 8 is an enlarged cross-sectional view of FIG. As shown in FIG. 7, the coil bobbin 6 is provided with a voice coil locking portion 41 and a reinforcing rib 43 over the entire circumference of the outer wall 40. The voice coil locking part 41 has a stepped structure provided on the outer wall 40, and the voice coil 7 formed by winding in an empty manner is formed into a track shape and inserted into the voice coil locking part 41, and the upper end The voice coil 7 is positioned by abutting against the step 42.

  The reinforcing rib 43 formed on the upper side wall of the coil bobbin 6 is used for adhesion to the bottom surface of the diaphragm 2.

  Even if an external force is applied to the linear portion 18 of the coil bobbin 6 by the reinforcing rib 43 provided at the upper end of the outer side wall 40 and the reinforcing member 20a provided at the center lower part of the coil bobbin 6, the deformation can be prevented. .

  FIG. 9 is a partially enlarged partial sectional view of the vicinity of both ends of the coil bobbin. The lower ends of both ends of the coil bobbin 6 are connected to a thin plate-like support member 8 and are fixed to the frame 5 via the support member 8 as described later. The support member 8 supports the coil bobbin 6 from below.

  As shown in FIG. 8, bottom plates 20 are provided at both ends 19 of the coil bobbin 6. A projecting portion 21 is provided on the lower surface of the bottom plate 20. The protruding portion 21 extends downward and is inserted into the fixing hole 25 of the supporting member 8 to fix the supporting member 8.

  The support member 8 is a plate-like member, and an outer peripheral portion 24 and an inner peripheral portion 22 configured in a substantially similar shape are arranged in a concentric position, and a pleat 23 as an example of a connecting portion is provided therebetween. Yes. The pleats 23 allow the outer peripheral portion 24 and the inner peripheral portion 22 to move in the thickness direction.

  In the present embodiment, the support member 8 is formed of a substantially disk-shaped cloth molded product, and an inner peripheral portion 22 having a fixing hole 25 provided in the central portion is an outer periphery located at the outermost peripheral portion by the pleats 23. A portion (flange) 24 is connected. The protruding portion 21 of the coil bobbin 6 is inserted into the fixing hole 25 and connected to the coil bobbin 6, and the outer peripheral portion 24 is connected to the support member arrangement hole 54 of the frame 5.

  When a force in a direction intersecting the surface of the support member 8 is applied, the pleat 23 is deformed to absorb the displacement in the height direction between the flange 24 and the fixing hole 25.

  The structure of the support member 8 is not particularly limited as long as it has the above function. Moreover, a metal plate, a resin plate, etc. are used suitably as a material. FIG. 10 shows a modification of the support member 8. The support member 8 in FIG. 10 is formed of a synthetic resin thin plate, and the outer peripheral portion 24 and the inner peripheral portion 22 are connected by a thin connecting portion 23.

  As shown in FIG. 11, the support member 8 is attached to the support member arrangement hole 54 from the outside of the bottom surface of the frame 5. The support member arrangement hole 54 on the bottom surface of the frame 5 is a through hole for arranging the support member 8. As described above, since the protruding portion 21 of the coil bobbin 6 is provided so as to protrude downward, a part thereof is located in the support member arrangement hole 54. In this state, the outer peripheral portion 24 of the support member 8 is attached to the periphery of the support member arrangement hole 54 from the outside of the bottom surface of the frame, and the protruding portion 21 is inserted into the fixing hole 25 of the inner peripheral portion 22 of the support member 8. With this attachment method, the frame 5 and the coil bobbin 6 can be connected via the support member 8 in an easy process.

  Further, by arranging the protruding portion 21 of the coil bobbin 6 in the support member arrangement hole 54, the thickness dimension of the frame 5 can be reduced, and the speaker can be thinned.

  The support member 8 and the coil bobbin 6 arranged in this manner support the coil bobbin 6 from below when the support member 8 is stationary. In addition, since the pleats 23 are provided concentrically in the supporting member 8, the supporting member 8 can exert a supporting force with respect to stress from any direction along the surface. For example, the diaphragm 2 faces the front. Even if the speaker 1 is arranged in such a direction, the coil bobbin 6 can be supported.

  When the speaker 1 is used, the support member 8 is deformed along with the vertical vibration of the coil bobbin 6. As described above, since the upper end of the coil bobbin 6 is fixed to the diaphragm 2 and the lower end is supported by the support member 8, the interval between the support portions is wide and stable vertical vibration can be ensured. Further, since the height of the frame 5 can be reduced while ensuring stable vertical vibration, a thin speaker can be realized.

  With the above configuration, the coil bobbin 6 is supported from above and below by the diaphragm 2 and the support member 8, and the stress applied to the diaphragm 2 is reduced. Therefore, even if the coil bobbin 6 is configured to be large in order to increase the sound pressure level, the stress applied to the diaphragm 2 is reduced, so that the diaphragm can be made thinner and lighter. Therefore, in addition to the improvement of the sound pressure level due to the large coil bobbin 6, the improvement of the sound pressure level accompanying the weight reduction of the diaphragm can be realized.

  FIG. 12 is a diagram illustrating another example of the mounting structure of the speaker diaphragm and the coil bobbin. In this example, two pairs of coil bobbins are used for the diaphragm of the speaker, and the coil bobbins are attached in parallel along each side of the diaphragm. According to this example, it is possible to increase the structure for applying vertical vibration to the diaphragm, and to obtain a higher output speaker.

  As described above, according to the speaker of the embodiment of the present invention, the coil bobbin 6 is supported so as to be held between the support member 8 and the diaphragm 2. For this reason, even if the coil bobbin 6 is increased in size, the diaphragm 2 need not be reinforced, and the level of the reproduced sound pressure can be increased. Moreover, since the distance of the location which supports the coil bobbin 6 can be enlarged, the vibration linearity of the diaphragm 2 can be improved and the thickness of the speaker can be reduced.

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect. For example, the connection structure between the coil bobbin 6 and the support member 8 can be widely applied as long as a thin plate-like support member is attached to the lower portions of both ends of the coil bobbin.

DESCRIPTION OF SYMBOLS 1 Speaker 2 Diaphragm 3 Edge 4 Upper frame 5 Frame 6 Coil bobbin 7 Voice coil 8 Support member 9 Terminal board 10 Magnetic circuit unit 11 Diaphragm fixing | fixed part 14 Yoke 15 Magnet 16 Pole 17a, 17b Magnetic gap 18 Linear part 19 End part 20 Bottom plate 20a Reinforcing member 21 Protruding portion 22 Inner peripheral portion 23 Pleated (connecting portion)
24 outer peripheral part 25 fixing hole

Claims (7)

A diaphragm supported by a frame via an edge provided around the periphery;
An intermediate portion of the coil bobbin having an elongated coil bobbin fixed to a part of the diaphragm and having a voice coil wound around an outer surface thereof, and a yoke member having a linear gap parallel to each other and having a magnetic gap open at both ends. Is disposed in the magnetic gap of the yoke member, while a plurality of magnetic circuit units disposed in the frame such that both ends are located outside the magnetic gap;
A speaker comprising: a support member connected to the lower ends of each of the coil bobbins and the frame, and supporting the coil bobbins.   The speaker according to claim 1, wherein the diaphragm is substantially rectangular, and the coil bobbins are provided in parallel to each other.   The speaker according to claim 1 or 2, wherein the coil bobbin has a track shape in which longitudinal surfaces are parallel to each other and both end sides are formed as arcuate surfaces. The coil bobbin has a bottom wall provided with projecting portions extending downward at both ends,
The frame includes a through hole at a position where the protrusion is provided,
The speaker according to claim 1, wherein the support member is disposed on an outer bottom surface of the frame and is connected to the protruding portion through the through hole.   The support member has an outer portion configured in a thin plate shape and connected to a frame, and an inner portion provided with a fixing hole into which the protruding portion is inserted, and the inner portion is in a thickness direction of the outer portion. The speaker according to claim 1, wherein the speaker is configured to be displaced.   The speaker according to claim 5, wherein the support member includes a connection portion that connects the outer portion and the inner portion. A plurality of yoke members provided in the magnetic circuit unit are provided intermittently,
The speaker according to any one of claims 1 to 6, wherein the coil bobbin includes a reinforcing member that connects surfaces facing each other in a short direction in gaps between the plurality of yoke members.