JP2013021469A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high efficiency speaker which helps to reduce manufacturing time and labor and exhibits a high reproduction sound pressure level.SOLUTION: A speaker comprises: a magnetic circuit 10, accommodated inside a frame 5, which includes magnetic gaps 17a, 17b in mutually parallel linear form, with both ends open; a slender shaped diaphragm 2, supported by the frame 5, which has a longer direction and a short direction; a slender shaped coil bobbin 6, fastened to the diaphragm 2, whose plane intersecting the vibration direction of the diaphragm at right angles has a longer direction and a short direction and whose planes opposed to the short end are parallel to each other; and a voice coil 7 wound round the coil bobbin 6. In the speaker, the coil bobbin 6 is disposed in such a way that its linear shaped intermediate section is located within the magnetic gaps of the magnetic circuit, while its opposite ends 19 are located outside the magnetic gaps, and comes with sheet shaped support members 8 to support the coil bobbin 6, which are connected to the lower parts at the opposite ends 19 of the coil bobbin and to the frame 5.

Description

  The present invention relates to an elongated speaker having a track shape and the like, and more particularly to a speaker having excellent sound reproduction capability and suitable for electronic devices such as thin televisions and displays.

  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 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).

  A magnetic circuit in which at least two bar-shaped magnets are sandwiched in parallel by sandwiching a bar-shaped center pole provided on the lower plate between the upper plate and the lower plate; a frame coupled to the magnetic circuit; There is a speaker comprising a diaphragm coupled to an outer peripheral portion of a frame and a voice coil coupled to the diaphragm and a part of which is disposed in a 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, as shown in Patent Document 3 and Patent Document 4, as shown in FIG. 10, each voice coil 102 is made smaller and lighter, while a plurality of diaphragms 101 are provided. A speaker with an increased reproduction sound 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 an 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, the technical problem to be solved by the present invention is to provide an elongated speaker that can reduce the manufacturing effort 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 housed in a frame and having a magnetic gap that is straight and parallel to each other and open at both ends;
An elongated diaphragm supported by the frame and having longitudinal and transversal directions;
An elongated coil bobbin that is fixed to the diaphragm and that has a plane perpendicular to the vibration direction of the diaphragm having a longitudinal direction and a lateral direction, and faces facing the lateral direction are parallel to each other;
In a speaker having a voice coil wound around the coil bobbin,
The coil bobbin is disposed such that a linear intermediate portion is disposed within the magnetic gap of the magnetic circuit, and both ends are disposed outside the magnetic gap,
Provided is a speaker comprising a support member connected to both lower ends of the coil bobbin and the frame and supporting the coil bobbin.

According to the second aspect of the present invention, the coil bobbin has bottom walls at both ends,
The supporting member is connected to the bottom wall and an inner bottom surface of the frame. The speaker according to the first aspect is provided.

  According to a third aspect of the present invention, there is provided the speaker according to the first or second aspect, wherein the coil bobbin has a track shape.

  According to a fourth aspect of the present invention, there is provided the speaker according to any one of the first to third aspects, wherein the coil bobbin is provided with a deformation preventing rib over the entire circumference of the side wall.

  According to a fifth aspect of the present invention, any one of the first to fourth aspects is characterized in that the coil bobbin includes a diaphragm mounting portion for supporting a diaphragm arranged to be fitted on an inner surface. One speaker is provided.

  According to the sixth aspect of the present invention, the support member has an outer part configured in a thin plate shape, and an inner part provided concentrically with the outer part, and the inner part is a main surface of the outer part. A speaker according to any one of the first to fourth aspects is provided, wherein the speaker is configured to be displaced in a direction.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, the support member has a pleat that connects a disc-shaped outer portion and an inner portion provided concentrically. One speaker is provided.

According to an eighth aspect of the present invention, a plurality of the magnetic circuits are provided intermittently,
The coil bobbin provides any one of the first to seventh speakers, characterized in that the coil bobbin includes a reinforcing member that connects surfaces facing each other in a short direction at a portion where the gaps of the plurality of magnetic circuits are provided. To do.

  According to the present invention, since the magnetic gap of the magnetic circuit is a straight line parallel to each other with both ends open, the gap can be easily adjusted with the voice coil. The process can be facilitated. Furthermore, by making the coil bobbin an elongated shape with parallel surfaces facing in the short direction, the driving force can be transmitted widely and uniformly to the diaphragm, and the vibration linearity of the diaphragm can be increased. Generation of the split resonance mode can be suppressed.

  In addition, in a speaker having an elongated diaphragm, the length of the voice coil intersecting with the magnetic flux can be increased by making the coil bobbin elongated, so that the driving force generated by the voice coil can be increased. Furthermore, by supporting the lower ends of both ends of the coil bobbin with the support member, the distance between the diaphragm supporting the coil bobbin and the support member can be increased. For this reason, the stability of the vertical vibration of the diaphragm can be improved. Therefore, the height dimension of the speaker can be reduced. Therefore, according to the present invention, it is possible to provide a speaker that is easy to manufacture and has input resistance while having a high sound level.

  According to the second aspect of the present invention, since the coil bobbin and the support member can be easily fixed and the coil bobbin can be reinforced, the coil bobbin is thinned and reduced in weight, thereby reducing the size of the speaker. can do.

  According to the sixth aspect of the present invention, by using the support member configured in a thin plate shape, it is possible to reduce the mounting space for the support member provided on the lower side of the coil bobbin and to reduce the height dimension of the speaker. .

  According to the fourth and fifth aspects of the present invention, the deformation bobbin can be prevented from being deformed by the deformation preventing rib and the diaphragm fitted inside, and the assembly accuracy of the speaker can be improved. .

  According to the seventh aspect of the present invention, the force from any direction along the main surface can be supported and orthogonal to the main surface by using the disc-shaped support member having concentric circular pleats. As for the direction of the vibration, the movement of the diaphragm is not hindered. Therefore, the coil bobbin can be efficiently supported.

  According to the eighth aspect of the present invention, since the deformation of the linear portion of the coil bobbin can be reduced, the positioning accuracy of the magnetic gap can be increased, and the coil bobbin has a long longitudinal direction with respect to the short direction. In addition, a speaker with high input resistance can be obtained.

It is a perspective view which shows the external appearance structure of the speaker concerning embodiment of this invention. It is an assembly exploded perspective view 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 sectional drawing in the DD line of the speaker of FIG. It is sectional drawing in the EE line of the speaker of FIG. It is a speaker partial enlarged view of FIG. FIG. 3 is a partially enlarged partial sectional view of FIG. 2. 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 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 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 or a notebook computer, for which a small installation space is desired.

  The speaker 1 according to the present embodiment has an elongated shape with a longitudinal length L1 of about 100 mm and a lateral length L2 of about 15 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 configured in parallel with each other and both ends in the longitudinal direction are configured in a semicircular shape.

  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 formed in an elongated shape corresponding to the track-shaped diaphragm 2.

  In this embodiment, the edge 3 is formed of a flexible material, and for example, foam rubber or the like is preferably used. The entire circumference of the diaphragm 2 including the long side of the track shape that linearly extends in the longitudinal direction of the diaphragm 2 and the short side of the track shape that becomes an arc shape in the short side direction is supported. The diaphragm 2 is supported flexibly by the edge 3, and is supported so as to be capable of vertical vibration as a whole.

  The diaphragm 2 and the elongated frame 5 corresponding to the shape of the diaphragm are connected via an edge 3. A magnetic circuit 10 and the like are accommodated in the frame 5.

  Further, a track-shaped coil bobbin 6 is provided on the back surface of the diaphragm 2 as shown in FIG. A voice coil 7 is wound around the side wall 6a of the track-shaped coil bobbin 6 to which the audio current is supplied. The coil bobbin 6 is configured in a shape that substantially conforms to the outer diameter shape of the diaphragm.

  The frame 5 has an elongated box shape with an upper opening corresponding to the shape of the diaphragm 2, and engages with the upper frame 4 at the opening. The frame 5 is manufactured by insert-molding the yoke of the magnetic circuit 10, and includes a diaphragm fixing portion 11 that engages the diaphragm 2, a yoke fixing portion 12 that fixes the yoke of the magnetic circuit 10, and a support member 8. A support member placement portion 13 to be placed is provided.

  The diaphragm fixing portion 11 is a step provided on the inner surface of the side wall 51 of the frame 5, and disposes the diaphragm at a specific position by locking the upper frame 4. Therefore, the reference position in the frame 5 of the coil bobbin 6 provided on the diaphragm 2 is determined uniformly in the normal state.

  The yoke fixing portion 12 that fixes the magnetic circuit 10 at a specific position is a wall-like member provided in parallel with the side wall 51 of the frame 5 and is guided between the side wall of the frame and the yoke fixing portion as will be described later. A groove 53 is formed.

  FIG. 3 is a cross-sectional view taken along line AA of the speaker of FIG. 4 is a cross-sectional view of the speaker of FIG. 1 taken along line BB. FIG. 5 is a cross-sectional view taken along line CC of the speaker shown in FIG. FIG. 6 is a cross-sectional view of the speaker of FIG. FIG. 7 is a cross-sectional view taken along line EE of the speaker of FIG.

  As shown in FIGS. 3 and 5, the magnetic circuit 10 fixed to the yoke fixing portion 12 includes an elongated yoke 14 fixed to a specific portion of the frame 5, and a magnet 15 arranged at the bottom of the yoke 14. And a pole 16 provided on the magnet.

  The yoke 14 is made of a magnetic metal having a U-shaped cross section, and a magnet 15 is disposed on the bottom surface. The elongated magnet 15 is an elongated shape whose outer shape is long in the longitudinal direction of the frame 5, and the pole 16 has a substantially elongated shape corresponding to the shape of 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 located.

  Between the long side of the yoke 14 and the long side of the pole 16, two parallel linear magnetic gaps 17a and 17b having a uniform width 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, which has a large maximum energy product (BH) max.

  The coil bobbin 6 provided on the diaphragm 2 is an annular cylindrical body that substantially conforms to the outer frame shape of the diaphragm, 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. As shown in FIG. 6, the coil bobbin 6 is configured in 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 10, while the both end portions 19 are disposed outside the magnetic gaps 17 a and 17 b of the magnetic circuit 10. By arranging only the straight portion 18 in the opposing magnetic gap of the magnetic circuit 10, the positional relationship between the magnetic gaps can be facilitated by the widths of the yoke 14 and the magnet 15. 5 can determine the mounting position of the magnetic circuit 10 in the short direction uniformly, so that the position of the voice coil 7 in the short direction in the magnetic gaps 17a and 17b can be performed with high accuracy. it can.

  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, the relative positional relationship in the longitudinal direction between the magnetic circuit 10 and the voice coil 7 is allowed to be slightly shifted.

  As shown in FIGS. 6 and 7, the coil bobbin 6 is provided with a reinforcing member 20 a at the center. The reinforcing member 20a connects the lower ends of two opposed intermediate portions 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.

  Further, as shown in FIG. 8, the coil bobbin 6 is provided with a voice coil locking portion 31 and a reinforcing rib 33 over the entire circumference of the outer wall 30. The voice coil 7 formed by winding in an idle manner can be formed into a track shape, inserted into the voice coil locking portion 31, and abutted against the step 32 at the upper end to adjust the position of application.

  A diaphragm mounting portion 34 is provided on the inner wall upper part of the coil bobbin 6 over the entire circumference of the side wall, and the diaphragm 2 inserted from the upper end side of the coil bobbin 6 is abutted and positioned. As described above, the opening of the coil bobbin 6 and the diaphragm 2 have the same shape, and by inserting the diaphragm 2 into the diaphragm attachment portion 34, deformation of the upper end side of the side wall of the coil bobbin 6 can be prevented.

  The deformation of the linear portion 18 of the coil bobbin 6 can be prevented by the reinforcing rib 33 provided on the outer side wall 30, the diaphragm mounting portion 34 provided at the upper end, and the reinforcing member 20 a provided at the lower center of the coil bobbin 6. it can.

  When the diaphragm 2 is attached to the coil bobbin 6, as shown in FIG. 8, both upper surfaces 2a, 6a are configured to have substantially the same height, and the edge 3 is formed on the upper surface 2a, 6a of the diaphragm 2 and the coil bobbin 6. By bonding, strength can be obtained.

  FIG. 9 is a partially enlarged partial sectional view of the vicinity of both ends of the coil bobbin. Thin plate-like support members 8 are provided at the lower ends of both ends of the coil bobbin 6 and are fixed to the frame 5 as will be described later, and support the coil bobbin 6 from below. In the present embodiment, a disk-shaped support member 8 having a size substantially the same as the semicircular shape at both ends of the coil bobbin is used.

  As shown in FIG. 9, a bottom plate 20 is provided at both ends of the coil bobbin 6, and is connected to the end of the surface facing the short side direction and a semicircular curved surface. A projecting portion 21 is provided on the lower surface of the bottom plate 20. The protrusion 21 extends downward and is inserted into the fixing hole 22 of the support member 8 to fix the support member 8.

  The support member has a configuration in which an outer peripheral portion and an inner peripheral portion having substantially the same outer peripheral portion are arranged at concentric positions, and the outer peripheral portion and the inner peripheral portion are connected to each other so that the outer peripheral portion and the inner peripheral portion can move in the thickness direction.

  In the present embodiment, the support member 8 is formed of a disk-shaped cloth molded product, and a flange 24 located at the outermost peripheral portion by a pleat 23 having an inner portion having a fixing hole 22 provided in the center and having a concentric shape. Connected with. The fixing hole 22 is inserted into the protruding portion 21 and connected to the coil bobbin, and the flange 24 is fixed to the support member arranging portion 13 of the frame 5.

  In order to prevent interference between the projecting portion 21 of the coil bobbin 6 and the frame 5 and to open the lower portion of the support member to ensure smooth movement of the coil bobbin 6, the support member arrangement portion 13 of the frame 5 has a central portion. A through-hole 54 is provided in the front.

  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 22. In addition, the support member 8 does not need to be comprised with the cloth molded product, For example, a metal etc. can be used.

  The positional relationship between the support member 8 and the coil bobbin 6 is arranged so that the support member 8 supports the coil bobbin 6 from the lower side in a steady state. 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. Thus, even if the speaker 1 is laid down, the coil bobbin 6 can be supported.

  When the speaker 1 is used, the support member 8 is deformed with the vibration of the coil bobbin 6. As described above, the coil bobbin 6 is fixed to the diaphragm 2 at the upper end and supported by the support member 8 at the lower end, so that the interval between the support portions is wide and stable vertical vibration can be ensured. Moreover, since the height of the coil bobbin 6 can be reduced while ensuring stable vertical vibration, the thickness dimension of the speaker can be reduced.

  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.

  As will be described later, the lead wire 7a of the voice coil 7 starts from the vicinity of both end portions 19 and passes through the guide groove 53 of the lead wire 7a provided along the side wall 51 of the frame 5, and from the insertion hole 52 to the outside of the frame 5. Pulled out.

  The lead wire 7 a routed outside the frame 5 from the insertion hole 52 provided in the side wall 51 of the frame 5 reaches the terminal plate 9 provided outside the side wall 51. For this reason, most of the lead wire 7a is concealed so that it cannot be visually recognized from the outside, and does not come into contact with other members.

  As described above, according to the speaker according to the embodiment of the present invention, the coil bobbin 6 is supported so as to be sandwiched between the support member 8 and the diaphragm 2. Since less reinforcement is required, the level of reproduced sound pressure can be increased. Moreover, since the coil bobbin 6 can be enlarged, the vibration linearity of the diaphragm 2 can be improved.

  Further, in a speaker having a track-shaped diaphragm, since the length of the voice coil crossing the magnetic flux can be increased by making the coil bobbin elongated, the driving force generated by the voice coil can be increased.

  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.

  Moreover, if the support member provided in the both ends lower part of the coil bobbin 6 is a thin plate shape, the shape and material will not be specifically limited, For example, you may be comprised by the rectangle.

  The speaker of the present invention can be used for a relatively small electronic device and can prevent breakage of the lead wire, thereby providing an electronic device with excellent durability.

DESCRIPTION OF SYMBOLS 1 Speaker 2 Diaphragm 3 Edge 4 Upper frame 5 Frame 6 Coil bobbin 7 Voice coil 8 Support member 10 Magnetic circuit 11 Diaphragm fixing part 12 Yoke fixing part 13 Supporting member arrangement part 14 Yoke 15 Magnet 16 Pole 17a, 17b Magnetic gap 18 Straight line Part 19 End 20 Bottom plate 20a Reinforcing member 21 Projecting part 22 Fixing hole 23 Pleated 24 Flange

According to the first aspect of the present invention, a magnetic circuit housed in a frame and having a magnetic gap that is straight and parallel to each other and open at both ends;
An elongated diaphragm supported by the frame and having longitudinal and transversal directions;
The fixed to the diaphragm, a plane orthogonal to the vibration direction of the diaphragm has a longitudinal and lateral direction, and the coil bobbin in the short direction surface facing the parallel to one another elongated shape,
In a speaker having a voice coil wound around the coil bobbin,
The coil bobbin has a bottom wall provided with projecting portions extending downward at both ends, and a linear intermediate portion is disposed in the magnetic gap of the magnetic circuit, while the both ends are located outside the magnetic gap. Arranged as
A speaker having a fixing hole into which the protruding portion of the coil bobbin is inserted, and a support member connected to the coil bobbin and a frame to support the coil bobbin is provided.

According to a second aspect of the present invention, prior to Symbol support member provides a first embodiment of a speaker, characterized in that connected to the inner bottom surface of the previous SL frame.

According to the 6th aspect of this invention, it has the outer part comprised by the thin-plate shape, the inner part which is provided concentrically with the said outer part, and has the said fixing hole , The said inner part is the thickness direction of an outer part. The speaker according to any one of the first to fourth aspects is provided.

According to a seventh aspect of the present invention, the support member, the outer portion and the inner portion is disposed concentrically in a circular plate shape, and having a pleat that connects the outer portion and the inner portion, the A speaker according to any one of the first to sixth aspects is provided.

Claims (8)

A magnetic circuit housed in a frame and having a magnetic gap that is parallel to each other and open at both ends;
An elongated diaphragm supported by the frame and having longitudinal and transversal directions;
An elongated coil bobbin that is fixed to the diaphragm and that has a plane perpendicular to the vibration direction of the diaphragm having a longitudinal direction and a lateral direction, and faces facing the lateral direction are parallel to each other;
In a speaker having a voice coil wound around the coil bobbin,
The coil bobbin is disposed such that a linear intermediate portion is disposed within the magnetic gap of the magnetic circuit, and both ends are disposed outside the magnetic gap.
A speaker comprising: a support member connected to the lower ends of both ends of the coil bobbin and the frame to support the coil bobbin. The coil bobbin has bottom walls at both ends,
The speaker according to claim 1, wherein the support member is connected to the bottom wall and an inner bottom surface of the frame.   The speaker according to claim 1, wherein the coil bobbin has a track shape.   The speaker according to any one of claims 1 to 3, wherein the coil bobbin is provided with a deformation preventing rib over the entire circumference of the side wall.   The speaker according to any one of claims 1 to 4, wherein the coil bobbin includes a diaphragm mounting portion that supports a diaphragm arranged to be fitted on an inner surface thereof.   The support member has an outer part configured in a thin plate shape and an inner part provided concentrically with the outer part, and the inner part is configured to be displaced in the main surface direction of the outer part. The speaker according to any one of claims 1 to 5, wherein   The speaker according to claim 6, wherein the support member has a pleat that connects a disc-shaped outer side portion and an inner side portion provided concentrically. A plurality of the magnetic circuits are provided intermittently,
The said coil bobbin is provided with the reinforcement member which connects the surface which opposes a transversal direction to the part in which the clearance gap between these several magnetic circuits is provided, The Claim 1 characterized by the above-mentioned. Speaker.

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