JP6090749B2 - Thin speaker - Google Patents

Description

  The present invention relates to a speaker, and more particularly to a thin speaker used in an electronic device such as a thin television.

  In a device such as a thin display to which a speaker for reproducing sound is attached, it is desired to reduce the area other than the display portion, and the space required for attaching the speaker is also required to be reduced in size and thickness. In particular, an elongated (rectangular, oval (including elliptical, track-shaped) speaker) speaker can be suitably used for these devices because of its shape. However, the elongated speaker has a diaphragm area limited in the short direction, and the influence of the divided vibration peculiar to the elongated speaker diaphragm is large, making it difficult to obtain a flat reproduction sound pressure frequency characteristic. For this reason, there is a disadvantage in sound reproduction ability. Therefore, in order to solve these problems, various speakers as described below have been proposed.

  For example, in a track type speaker in which the vertical and horizontal dimensions of the speaker shape are the long side and the short side, the magnet constituting the magnetic circuit has a large shape within the range that fits in the speaker outline, and the magnetic circuit is constituted. There is known a track type speaker in which the shape of the voice coil to be formed is an elongated shape extending along the longitudinal direction (Patent Document 1).

  Further, a magnetic circuit in which at least two bar-shaped magnets arranged in parallel across a bar-shaped center pole portion provided on the lower plate are sandwiched between the upper plate and the lower plate, and a frame coupled to the magnetic circuit And a loudspeaker comprising a diaphragm coupled to the outer periphery of the frame, and a voice coil coupled to the diaphragm and partially disposed within the magnetic gap of the magnetic circuit (Patent Document) 2).

  However, in the case of an elongated speaker whose short direction is shorter than the longitudinal direction, the length of the voice coil intersecting with the magnetic flux is increased by making the magnetic gap of the magnetic circuit and the voice coil into a shape including two sides in the longitudinal direction. By increasing the driving force generated in the voice coil, a highly efficient speaker can be realized. On the other hand, if the length of the voice coil intersecting with the magnetic flux is lengthened, the bobbin around which the elongated coil is wound is enlarged, so that the strength of the speaker, particularly the diaphragm supporting the voice coil and the edge is likely to be insufficient. For this reason, strength is required for the material of the diaphragm that supports the voice coil, and there is a problem that sound distortion is likely to occur during the reproduction operation, and the reproduction sound pressure level is lowered and efficiency is deteriorated. .

  In order to solve this problem, Patent Document 3 and Patent Document 4 disclose that each voice coil 102 is made smaller and lighter as shown in FIG. A speaker with an increased pressure level is also disclosed.

JP 2000-197190 A JP 2004-266337 A JP 2006-31174 A JP 2011-10167 A

  However, in a speaker in which voice coils are installed at a plurality of locations on the diaphragm, there is a problem that the labor for wiring the plurality of voice coils is large and the manufacturing cost increases. Further, since the plurality of voice coils 102 move independently from each other, a large driving force is applied to the portion where the voice coil 102 is provided as shown by the arrow 90 in FIG. There is a problem that the diaphragm is likely to generate a divided resonance mode, such as the occurrence of resonance in the entire diaphragm. For this reason, the length of the diaphragm is substantially limited, and it has been difficult to realize an elongated speaker having a large ratio between the long side and the short side.

  In addition, in order to reduce the problem of occurrence of the split resonance mode, in order to configure the diaphragm to be strong, measures such as providing a reinforcing member on the diaphragm are taken as disclosed in Patent Document 4. However, all of these configurations increase the weight of the diaphragm, which causes a problem that the reproduction sound pressure level is lowered.

  Therefore, a technical problem to be solved by the present invention is to provide a speaker that can reduce the labor of manufacture and realize 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, a magnetic circuit having a magnetic gap formed between a yoke and a magnet, housed in a frame, a diaphragm supported by the frame, and a voice coil fixture A speaker having a voice coil connected to the diaphragm and disposed in the magnetic cap,
The voice coil fixture includes a plate-shaped body provided in a stacked state on the inner surface side of the diaphragm, and co Irubobin track shape the voice coil Ru wound secured to the outer peripheral surface on the plate-like body, said coil bobbin A support pin that is fixed to the plate-like body so as to face the longitudinal direction side of the coil bobbin and extends in the bottom direction of the frame,
The yoke is configured in substantially the same shape as the coil bobbin,
The frame is provided with a support member deformable in the vibration direction of the diaphragm that supports the voice coil fixture in connection with the support pin.

  According to the present invention, the support pin is provided on the plate-like main body arranged in a laminated state on the diaphragm, and the support pin is connected to the support member provided on the frame. It will be supported by the frame. Therefore, even if the number of turns and the distance of the voice coil are increased in order to increase the sound pressure level, the vibration operation of the diaphragm is not hindered. Further, since the diaphragm is provided with a plate-like main body, it is possible to suppress the occurrence of distortion and the like of the diaphragm, and it is possible to suppress the generation of the split resonance mode.

  According to the second aspect of the present invention, in supporting the track-shaped diaphragm, the coil bobbin is disposed in the center portion and the support pins are provided so as to sandwich the coil bobbin, thereby ensuring the assembling configuration and the symmetry of the configuration. Thus, a speaker having excellent reproduction performance can be obtained.

It is a perspective view which shows the external appearance structure of the speaker concerning 1st Embodiment of this invention. It is the perspective view which looked at the speaker of FIG. 1 from another angle. It is an assembly exploded view of the speaker of FIG. It is sectional drawing in the AA of the speaker of FIG. It is a figure which shows the structure of the supporting member used for the speaker of FIG. It is an assembly exploded perspective view showing the composition of the speaker concerning a 2nd embodiment of the present invention. It is a figure which shows typically the structure of the diaphragm used for the conventional speaker. It is a figure which shows typically generation | occurrence | production of the divided vibration of the diaphragm in the conventional speaker.

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

(First embodiment)
FIG. 1 is a perspective view showing an external configuration of a speaker according to a first embodiment of the present invention. FIG. 2 is a perspective view of the speaker of FIG. 1 viewed from another angle. FIG. 3 is an exploded view of the speaker of FIG. The speaker 1 of the present invention is a speaker that is mounted on an electronic device such as a thin television for which a reduction in the mounting space is desired.

  The speaker 1 has an elongated shape with a main body portion having a longitudinal length L1 of about 100 mm and a short side length L2 of about 20 mm, and a diaphragm 2 is provided on the upper surface of a frame 5 that accommodates a magnetic circuit and the like. The diaphragm 2 has a track shape in which the sides in the short direction are parallel to each other and both end portions in the longitudinal direction are formed in a substantially semicircular shape. Various members such as the magnetic circuit 10 are accommodated in the frame 5 as shown in FIG.

  The diaphragm 2 vibrates and speaks when electrical signals are sent from the lead wires 7a and 7b (see FIG. 3) to the magnetic circuit built in the frame 5. The diaphragm 2 is vibrated by an electric signal flowing through the lead wires 7a and 7b (see FIG. 3) through the voice coil 9 disposed in the magnetic circuit 10 attached to the frame 5 and converted into a sound wave.

  The diaphragm 2 is made of a plate member having a relatively high rigidity, and a synthetic resin, a honeycomb metal material, or the like can be used. In the present embodiment, the diaphragm 2 is made of a material obtained by bonding a sheet of aluminum and paper to the surface of a honeycomb metal material.

  An edge 3 is attached to the periphery of the diaphragm 2, and the diaphragm 2 is connected to the frame 5 through the edge 3. As shown in FIG. 5, an edge portion 4 is provided at the outer peripheral end of the edge 3, and the diaphragm 2 and the frame 5 are positioned by adhering to the opening portion of the frame 5.

  The edge 3 is formed of a flexible material, and in this embodiment, for example, foam rubber is preferably used. By supporting the entire circumference of the diaphragm 2 with the flexible edge 3, the diaphragm 2 is supported so as to be capable of vertical vibration with respect to the edge portion 4. As shown in FIG. 3, unevenness 3 a is provided at the corner portion of the edge 3 where the deformation stress of the edge 3 is concentrated when the diaphragm 2 vibrates, and the stress concentration associated with the deformation of the edge 3 is alleviated.

  Further, a voice coil fixture 6 is provided on the back surface of the diaphragm 2 as shown in FIG. The voice coil fixture 6 has a plate-like main body 7 provided in a laminated state on the inner surface side of the diaphragm 2. The plate-like main body 7 has approximately the same size as the diaphragm 2, and duralumin or aluminum having a thickness of about 0.1 to 1 mm is preferably used from the viewpoint of strength and weight.

  A coil bobbin 8 having an elliptical cross section is integrally provided at the central portion of the plate-like main body 7, and the voice coil 9 is wound around the outer peripheral surface of the side wall 8 a of the track-shaped coil bobbin 8. In addition, support pins 16 are suspended from both ends of the plate-like main body 7 with the coil bobbin 8 in between.

  The plate-like main body 7 and the coil bobbin 8 can be manufactured by press-molding a light metal such as duralumin or aluminum, a heat-resistant resin film, or the like. In the present embodiment, a thin-walled integrally molded product obtained by pressing one thin aluminum material having a large heat dissipation effect is used.

  The frame 5 is a bottomed container-shaped member having a bottom wall 5a and a side wall 5b, and is made of a nonmagnetic material. In this embodiment, it is formed by injection molding a synthetic resin. The frame 5 has an elongated box shape with an upper opening corresponding to the shape of the edge portion 4, and engages with the edge portion 4 at the opening portion. A diaphragm fixing portion 11 that engages with the diaphragm 2, a yoke fixing portion 12 that fixes the yoke 10 a of the magnetic circuit 10, and a support member arrangement portion 13 where the support member 15 is arranged are provided.

  At both ends in the longitudinal direction of the frame 5, mounting portions 14 for fixing electronic devices are provided. The attachment portion 14 is configured so that a cushion member 18 having an H-shaped cross section is fitted into a fixed wall 14a configured by cutting out a part thereof, and can be detachably held. The speaker 1 is fixed to the electronic device using a screw or the like (not shown) in the hole 18a. The cushion member is formed of an elastic body such as rubber, and is configured to absorb vibration of the vibrating speaker 1 and not transmit the vibration to the electronic device.

  The diaphragm fixing portion 11 is a step provided on the inner side surface of the side wall of the frame 5, and disposes the diaphragm at a specific position by locking the edge portion 4. Therefore, the reference position of the coil bobbin 8 provided on the diaphragm 2 in the frame 5 is determined uniformly in the normal state.

  The yoke fixing portion 12 that fixes the magnetic circuit 10 at a specific position is a through hole provided in parallel to the bottom wall 5a of the frame 5, and inserts and fixes the yoke 10a.

  The yoke 10a comprises the magnetic circuit 10 with the magnet 10b and the pole piece 10c.

  The magnet 10b used in the magnetic circuit 10 is a permanent magnet having substantially the same shape as the bottom surface of the yoke. In the present embodiment, a magnet having a length of about 50 mm and a thickness of about 3 mm is used. As the type of magnet, an Nd—Fe—B rare earth magnet having large residual magnetization and coercive force and strong coercive force even in a small volume is used, but is not particularly limited, and may be a ferrite magnet. The rare earth magnet is an Nd—Fe—B type neodymium magnet or an Sm—Co type samarium cobalt magnet, which has a large maximum energy product (BH) max. In addition, the kind of magnet 10b is not specifically limited, An alnico magnet, a ferrite magnet, a neodymium magnet, a samarium cobalt magnet, etc. are used.

  As shown in FIG. 3, the pole piece 10c is a metal plate arranged so as to be laminated on the upper surface of the magnet.

  In the magnetic circuit 10 configured as described above, a magnetic gap G is formed between the yoke 10a and the pole piece 10c. In the present embodiment, the magnetic gap G is configured to be approximately 1.5 mm.

  A coil bobbin 8 and a voice coil 9 are disposed in the magnetic gap G. The voice coil 9 is formed in a cylindrical shape by winding a plurality of insulated conductors, and the lead wires 9a and 9b are drawn from the upper and lower end positions to supply a sound current. In the present embodiment, the lead wires 9 a and 9 b are connected to lead wires 7 a and 7 b connected to the plate-like portion 7 of the voice coil fixture 6.

  As shown in FIG. 3, the lead wires 7a and 7b are connected to the terminal plate 17 provided on the outer bottom wall through the through holes 5c provided on the bottom wall of the frame, and are electrically connected to the external power supply line. .

  The support member arrangement portion 13 is a through hole provided at both end portions in the longitudinal direction of the bottom wall of the frame 5 with the yoke fixing portion 12 interposed therebetween, and the plate-like support member 15 is fixed thereto.

  As shown in FIG. 5, the support member 15 is made of a specially shaped metal flat damper that is easy to downsize and has excellent body amplitude. In this embodiment, stainless steel having a diameter of 28 mm and a thickness of 0.1 mm is used. It is used. The support member 15 is connected to the support pin 16 of the voice coil fixture 6 and the frame 5, and supports the diaphragm 2 so as to be able to vibrate vertically.

  The support member 15 includes a ring-shaped outer peripheral frame 20, a ring-shaped inner peripheral frame 21 provided inside the outer peripheral frame 2, and an arm provided between the outer peripheral frame 20 and the inner peripheral frame 21. Part 22.

  Further, three pairs of arm portions 22 are provided in a rotationally symmetrical manner with a constant interval between the outer peripheral frame 20 and the inner peripheral frame 21. The arm part 22 includes an arm part body 22 a that is stretched in an arc shape between the outer peripheral frame 20 and the inner peripheral frame 21 and elastically connects the outer peripheral frame 20 and the inner peripheral frame 21. The central part of the arm part main body 22a is disposed between the outer peripheral frame 20 and the inner peripheral frame 21 at an angle substantially parallel to each other, and both ends 22b and 22c of the arm part main body 22a are compared to the arm part main body 22a. The width dimension is formed to be large. Further, the vicinity of the connecting portion between the outer peripheral frame 20 and the inner peripheral frame 21 that is both ends of the arm portion 22 is formed in a curved surface shape.

  The connecting end 22b of the arm part with the outer peripheral frame 20 is configured such that the inner peripheral edge 22d projects, and the connecting end part 22c of the arm part with the inner peripheral frame 21 is configured so that the outer peripheral edge 22e projects. ing. As a result, the arm portion 22 is formed to become narrower as it extends from the outer peripheral frame 20 toward the inner peripheral frame 21 side, and to become wider as it approaches the connecting end portion 22 c with the inner peripheral frame 21.

  The lower end of the support pin 16 of the voice coil fixture 6 is connected to the connection hole 23 provided in the inner peripheral frame 21. On the other hand, the support member arrangement part 13 of the frame 5 is connected to the outer peripheral frame 20. Thereby, the voice coil fixture 6 and the diaphragm 2 are supported in a state of being supported by the support member 15.

  The support member moves together with the vibration of the connecting portion of the support pin 16 with respect to the inner peripheral frame 21 as the diaphragm 2 vibrates, so that the entire inner peripheral frame 21 moves in the vibration direction (vertical direction in FIG. 3). . On the other hand, the periphery of the outer peripheral frame 20 is fixed to the frame 5. For this reason, at the time of vibration, the arm part 20 bends in the vibration direction to allow vibration. At this time, since a twisting force acts on the arm portion 20 in the thickness direction, the central portion of the arm portion main body 22a is twisted, so that stress is not concentrated on both ends 22b and 22c of the arm portion 20, and the support member Can be prevented from breaking. Further, since the central portion is configured to be narrow, there is an effect that it is difficult to inhibit the vertical vibration of the inner peripheral frame 21.

  That is, the inner peripheral frame 21 connected to the vibration plate 2 is displaced in the thickness direction of the support member 15 by bending the arm portion 20 due to vibration of the vibration plate 2. At this time, since the intermediate position of the arm portion 20 is twisted obliquely with respect to the thickness direction, the intermediate portion is shifted to the yoke side. In the damper according to this embodiment, since both end portions of the arm portion 20 are wide and have a large curvature, the narrow arm portion 20 absorbs twist and is applied to both ends of the arm portion 20. Bending fatigue can be reduced, and breakage of the support member 15 can be prevented.

  As described above, the diaphragm 2 is supported by the frame via the voice coil fixture 6, so that even if the number of turns of the voice coil 9 is increased or the coil bobbin 8 is enlarged, the movement of the diaphragm can be inhibited. Few. In addition, since the coil bobbin 8 is not directly supported by the support member 15, the speaker can be made thin and the size can be easily reduced.

  Further, since the voice coil fixture 6 has a plate-like main body arranged in a state of being laminated on the diaphragm, it is possible to suppress the occurrence of the split resonance mode of the diaphragm of the diaphragm. The degree of freedom in designing the diaphragm can be increased. In addition, by arranging the support member symmetrically around the voice coil, it is farther away from the support position by the diaphragm edge and further in parallel with the bottom of the frame, so that the voice coil has excellent vibration straightness. be able to.

(Second Embodiment)
FIG. 6 is an exploded view of the speaker according to the second embodiment of the present invention. The speaker 31 of the present invention is used in an electronic device such as a thin television for which a reduction in mounting space is desired, and a speaker for reproducing low-frequency sound compared to the speaker 1 according to the first embodiment. It is.

  The speaker 31 has an elongated shape with a main body portion having a longitudinal length of about 150 mm and a short side length of about 60 mm, and a vibration plate 32 is provided on the upper surface of a frame 35 that accommodates a magnetic circuit and the like. The diaphragm 32 has a track shape in which the sides in the short direction are parallel to each other and both end portions in the longitudinal direction are formed in a substantially semicircular shape. As shown in FIG. 6, various members such as the magnetic circuit 40 are accommodated in the frame 35.

  The diaphragm 32 vibrates and speaks when electrical signals are sent from the lead wires 37a and 37b to the magnetic circuit built in the frame 35. The diaphragm 2 is vibrated by an electric signal flowing through a lead wire through a voice coil 39 disposed in a magnetic circuit 40 attached to the frame 35 and converted into a sound wave.

  The diaphragm 32 is made of a plate member having relatively high rigidity. An edge 33 is affixed to the periphery of the diaphragm 32, and the diaphragm 32 is fixed to the frame 35 via the edge 33 and the edge portion 34. The diaphragm 32 and the edge 33 can be made of a material that is preferably used in the first embodiment.

  A voice coil fixture 36 is provided on the back surface of the diaphragm 32. The voice coil fixture 36 has a plate-like main body 37 provided in a laminated state on the inner surface side of the diaphragm 32. The plate-like main body 7 is configured to be smaller than the diaphragm 32, and duralumin or aluminum having a thickness of about 0.1 to 1 mm is preferably used.

  A circular bobbin attaching portion 37 a for attaching the coil bobbin 38 is provided in the central portion of the plate-like main body 37. Further, terminal plate mounting portions 37b are provided on both ends of the bobbin mounting portion 37a, and a terminal plate for electrically connecting lead wires 39a, 39b and lead wires 37a, 37b of a voice coil 39 to be described later. 47 is provided. In addition, support pins 46 are suspended from both ends of the plate-like main body 37.

  A voice coil 39 is wound around the outer peripheral surface of the side wall 38a of the coil bobbin 38 over the entire circumference. The plate-shaped main body 37 and the coil bobbin 38 can be manufactured by press-molding a light metal such as duralumin or aluminum, a heat-resistant resin film, or the like.

  The frame 35 is a bottomed container-shaped member having a bottom wall 35a and a side wall 35b, and engages with the edge portion 34 at an opening portion. The frame 35 is provided with a diaphragm fixing portion 41 that engages the diaphragm 32, a yoke fixing portion 42 that fixes the yoke 40a of the magnetic circuit 40, and a support member arrangement portion 43 in which the support member 45 is arranged. Yes.

  At both ends in the longitudinal direction of the frame 35, mounting portions 44 for fixing electronic devices are provided, and the cushion member 48 is detachably held.

  The diaphragm fixing portion 41, the yoke fixing portion 42, and the support member arranging portion 43 can be configured in the same manner as the speaker according to the first embodiment. However, the yoke fixing portion 42 is not insert-molded in this embodiment, and the yoke 40a is fixed to the frame 35 using an adhesive or the like, as will be described later.

  A coil bobbin 38 and a voice coil 39 are disposed in the magnetic gap G of the magnetic circuit 40 disposed in the yoke fixing portion 42. As described above, the lead wires 39a and 39b of the voice coil 39 are electrically connected to the lead wires 37a and 37b via the terminal plates provided on the plate-shaped main body 37, and pass through both sides of the support pins 46 to the frame 35. It is pulled out of the frame 35 from the provided extraction hole 35c.

  The support member 45 is configured by a metal flat damper, like the speaker of the first embodiment. The support member 45 is connected to the support pin 46 and the frame 35 of the voice coil fixture 36, and supports the diaphragm 32 so as to be capable of vertical vibration.

  The support member 45 is configured in the same manner as the support member 15 in the first embodiment, and includes a ring-shaped outer peripheral frame, a ring-shaped inner peripheral frame provided inside the outer peripheral frame, the outer peripheral frame, and the inner periphery. And an arm portion provided between the frame.

  Also in this embodiment, since the diaphragm 32 is supported by the frame via the voice coil fixture 36, the movement of the diaphragm is inhibited even if the number of turns of the voice coil 39 is increased or the coil bobbin 38 is enlarged. There is little to do. In addition, since the coil bobbin 38 is not directly supported by the support member 45, the speaker can be made thin and the size can be easily reduced.

  In addition, the voice coil fixture 36 can suppress the occurrence of the split resonance mode of the diaphragm of the diaphragm as in the first embodiment, and can have a structure excellent in the straightness of vibration of the voice coil. .

  In addition, this invention is not limited to the said embodiment, It can implement in another various aspect.

DESCRIPTION OF SYMBOLS 1,31 Speaker 2,32 Diaphragm 3,33 Edge 4,34 Edge part 5,35 Frame 6,36 Voice coil fixing tool 7,37 Plate-shaped main body 8,38 Coil bobbin 9,39 Voice coil 10,40 Magnetic circuit 10a , 40a Yoke 10b, 40b Magnet 10c, 40c Pole piece 11, 41 Diaphragm fixing part 12, 42 Yoke fixing part 13, 43 Support member disposing part 14, 44 Mounting part 15, 45 Support member 16, 46 Support pin 17, 47 Terminal plates 18 and 48 Cushion member 20 Outer frame 21 Inner frame 22 Arm

Claims (1)

A magnetic circuit housed in a frame and having a magnetic gap formed between a yoke and a magnet, a diaphragm supported by the frame, and a magnetic coil connected to the diaphragm via a voice coil fixture. In a speaker having a voice coil arranged in a cap,
The voice coil fixture includes a plate-shaped body provided in a stacked state on the inner surface side of the diaphragm, and co Irubobin track shape the voice coil Ru wound secured to the outer peripheral surface on the plate-like body, said coil bobbin A support pin that is fixed to the plate-like body so as to face the longitudinal direction side of the coil bobbin and extends in the bottom direction of the frame,
The yoke is configured in substantially the same shape as the coil bobbin,
The speaker according to claim 1, wherein the frame is provided with a support member that is deformable in a vibration direction of the diaphragm that is connected to the support pin and supports the voice coil fixture.

Images