JP2010124096A - Electroacoustic transducer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow an electroacoustic transducer of a dynamic electric type with a terminal member composed of a cantilever-like blade spring to be compact and have good workability during manufacturing, and further to reliably carry out electric connection with external apparatuses. <P>SOLUTION: The electric connection with the external apparatuses is reliably carried out by making a tip end unit 22e of a terminal member 22, whose base unit 22a is fixed to a frame 16, engage with a latch member 24A in a state to be bent by a predetermined amount. At the time, the latch member 24A is configured as a metal member integrally with a frame 16 by insert molding. Accordingly, required strength can be secured even if the thickness is made thin, and the latch material 24A can be made compact compared to when the latch material is formed as a portion of the frame 16 made of synthetic resin as the conventional method. Moreover, precision of a position and a supporting strength of the latch material 24A can be sufficiently secured. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a so-called electrodynamic electroacoustic transducer.

  In general, an electrodynamic electroacoustic transducer such as an electrodynamic speaker includes a synthetic resin frame, a diaphragm supported by the frame, and the diaphragm as described in, for example, “Patent Document 1”. And a terminal member for electrically connecting the voice coil to an external device.

  At that time, in the electroacoustic transducer described in “Patent Document 1”, the terminal member is constituted by a cantilever-shaped leaf spring whose base end is fixed to the frame. And in this electroacoustic transducer, it has the structure which the front-end | tip part is latched in the state which bent the terminal member predetermined amount by the latching | locking part formed as a part of the flame | frame itself.

JP 2008-219065 A

  By adopting a so-called pre-tension structure that locks the tip of a terminal member made of a cantilever-shaped leaf spring as described in the above-mentioned “Patent Document 1” while being bent by a predetermined amount. When the electroacoustic transducer is mounted on an external device, the required elastic repulsive force can be ensured even if the amount of bending deformation of the terminal member in contact with the terminal portion of the external device is small. As a result, electrical connection with an external device can be reliably performed.

  However, the electroacoustic transducer described in “Patent Document 1” has the following problems.

  That is, since the locking portion for locking the tip of the terminal member is formed as a part of the synthetic resin frame itself, the tip of the terminal member is bent in a predetermined amount. In order to do so, it is necessary to secure the required strength by increasing the thickness of the locking portion to some extent.

  Therefore, in this electroacoustic transducer, there exists a problem that a latching | locking part will enlarge and a flame | frame will also be enlarged correspondingly. Moreover, since the space on the frame in which such a locking part can be formed is limited, the degree of freedom in selecting the contact position when performing electrical connection with an external device is reduced. There is a problem.

  It is also conceivable to form a locking portion for locking the tip of the terminal member as part of the terminal member itself. However, in this case, it becomes difficult to lock the tip of the terminal member to the locking portion, and the terminal member is positioned and fixed at a predetermined position with respect to the frame. There is a problem that it becomes difficult to do.

  The present invention has been made in view of such circumstances, and is an electrodynamic electroacoustic transducer having a terminal member composed of a cantilever-like plate spring. An object of the present invention is to provide an electroacoustic transducer having a good configuration and capable of reliably connecting an external device.

  The present invention is intended to achieve the above object by adopting a configuration in which the tip of the terminal member is locked using a metal locking member formed integrally with the frame by insert molding.

That is, the electroacoustic transducer according to the present invention is
An electroacoustic comprising a synthetic resin frame, a diaphragm supported by the frame, a voice coil fixed to the diaphragm, and a terminal member for electrically connecting the voice coil to an external device. In the converter,
The terminal member is composed of a cantilever-shaped leaf spring having a base end fixed to the frame,
A metal locking member for locking the distal end portion of the terminal member in a state where the terminal member is bent by a predetermined amount on the frame is integrally formed with the frame by insert molding. It is a feature.

  The type of the “electroacoustic transducer” is not particularly limited, and for example, a speaker or a receiver can be employed.

  As long as the “terminal member” is composed of a cantilever-shaped plate spring whose base end is fixed to the frame, the specific configuration such as the shape and thickness thereof is not particularly limited, The arrangement on the frame is not particularly limited.

  If the above-mentioned "locking member" is a metal member that can lock the tip of the terminal member in a state where the terminal member is bent by a predetermined amount, its specific shape and the tip of the terminal member The mode of locking and the like are not particularly limited.

  As shown in the above configuration, the electroacoustic transducer according to the present invention is configured as an electrodynamic electroacoustic transducer, but a terminal member for electrically connecting the voice coil to an external device is provided. It is composed of a cantilever-shaped leaf spring whose base end is fixed to the frame, and a metal locking member for locking the distal end of the terminal member in a state where it is bent by a predetermined amount, Since it is formed integrally with the frame by insert molding, the following effects can be obtained.

  In other words, the locking member that locks the tip of the terminal member is not a part of the synthetic resin frame itself, but is made of a metal member. Can be secured. In addition, since the locking member is formed integrally with the frame by insert molding, the positional accuracy can be sufficiently secured, and the supporting strength can be sufficiently secured.

  As a result, since the locking member can be made compact, it is possible to prevent the electroacoustic transducer from becoming large, and to make an electrical connection with an external device. The degree of freedom of selection of the contact position can be increased.

  In that case, since the locking member is configured as a member different from the terminal member, the distal end portion of the terminal member is used as the locking member as compared with the case where these are configured as a single member. The operation of locking can be performed very easily, and the operation of positioning and fixing the terminal member at a predetermined position with respect to the frame can be easily performed.

  As described above, according to the present invention, in an electrodynamic electroacoustic transducer having a terminal member composed of a cantilever-like leaf spring, this is compact and has a good workability at the time of manufacture. It can be set as the structure which can perform electrical connection with an external apparatus reliably.

  In the above configuration, the metal terminal member that is electrically connected to the coil terminal of the voice coil is formed integrally with the frame by insert molding in a state where a part of the terminal is exposed on the surface of the frame as a land portion. If it is set as the structure and it is set as the structure by which the terminal member was fixedly supported by the land part of this terminal member in the base end part, conduction | electrical_connection with a voice coil and a terminal member can be aimed at easily.

  In this case, if the locking member and the terminal member are configured as a single member, the above-described effects can be obtained with a minimum number of parts.

  In the above configuration, if the notch portion that allows the terminal member to bend and deform toward the diaphragm side is formed in the vicinity of the locking member in the frame, the following operational effects can be obtained.

  That is, when the terminal member is electrically connected to an external device, the terminal member is bent and deformed toward the diaphragm side. Therefore, it is necessary to secure a movable space for the terminal member. At this time, if a notch portion that allows the terminal member to bend and deform toward the diaphragm side is formed in the frame in the vicinity of the locking member, the locking member is projected greatly from the surface of the frame. Thus, it is possible to secure a movable space for the terminal member without disposing it. Thus, the locking member can be made more compact and the support strength can be further increased.

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

  FIG. 1 is a plan view showing an electroacoustic transducer 10 according to an embodiment of the present invention in a state where the electroacoustic transducer 10 is arranged upward. 2 is a detailed view taken in the direction of arrow II in FIG. 1, and FIG. 3 is a detailed view taken in the direction of arrow III in FIG. Further, FIG. 4 is a bottom view showing the electroacoustic transducer 10.

  As shown in these drawings, the electroacoustic transducer 10 is a small electrodynamic speaker having a substantially rectangular outer shape in plan view, and is used in a state of being mounted on an external device such as a mobile phone. It has become so.

  The electroacoustic transducer 10 accommodates a diaphragm 12, a voice coil 14 that is bonded and fixed to the lower surface of the diaphragm 12, a frame 16 that fixes and supports the outer peripheral edge 12 a of the diaphragm 12, and a lower end portion of the voice coil 14. The magnetic circuit unit 18 in which a magnetic gap is formed, a cover member 20 that covers the diaphragm 12 from above, and a pair of terminal members 22 fixed to the frame 16 are provided.

  The diaphragm 12 has a substantially rectangular outer shape that is slightly smaller than the outer shape of the electroacoustic transducer 10. And this diaphragm 12 is comprised as the dome-shaped upper bulging part 12b which the part located in the inner peripheral side of the outer peripheral edge part 12a bulges upwards.

  The winding shape of the voice coil 14 is set to a substantially rectangular shape. The pair of coil terminals 14 a of the voice coil 14 extends from the corner portion of the voice coil 14 to the outer peripheral side, and extends substantially parallel to the short side portion of the voice coil 14.

  The frame 16 is made of a synthetic resin member having a substantially rectangular outer shape in plan view, and the outer peripheral edge 12a of the diaphragm 12 is fixedly supported on the upper surface of the outer peripheral wall 16a. The frame 16 is formed with a substantially rectangular central opening 16b that is slightly larger than the winding shape of the voice coil 14. The magnetic circuit unit 18 is bonded and fixed to the frame 16 with the magnetic circuit unit 18 inserted from below into the central opening 16b.

  Rib-like protrusions 16h that protrude downward along the central opening 16b are formed on the short side portions and the long side portions on the lower surface 16g of the frame 16, respectively. At this time, the heights of these four rib-like protrusions 16 h are set so that the lower end surfaces thereof are positioned slightly below the lower surface of the magnetic circuit unit 18.

  A pair of metal terminal members 24 that are electrically connected to a pair of coil terminals 14 a extending from the voice coil 14 are integrally formed with the frame 16 by insert molding.

  The pair of terminal members 24 are constituted by plate-like members formed stepwise along each of the pair of short side portions of the frame 16 as indicated by broken lines in FIG. At this time, the middle step portion of each terminal member 2 is completely embedded in the frame 16, but the upper step portion is a first corner portion 16 c where each short side portion and one long side portion of the frame 16 are connected. The lower land portion 24a is exposed on the lower surface 16g of the second corner portion 16d where each short side portion of the frame 16 is connected to the other long side portion. The land portion 24b is formed.

  Each coil terminal 14a of the voice coil 14 is conductively fixed to the upper land portion 24a of each terminal member 24 by thermocompression bonding.

  The magnetic circuit unit 18 is configured as an internal magnet type magnetic circuit unit.

  That is, the magnetic circuit unit 18 includes a substantially box-shaped base 32 surrounding the voice coil 14, a magnet 34 bonded and fixed to the upper surface of the bottom wall of the base 32, and a yoke bonded and fixed to the upper surface of the magnet 34. 36, and the magnetic gap is formed between the base 32 and the yoke 36.

  At that time, each corner portion of the base 32 is notched, and each corner portion is formed with a protruding piece 32a extending from the bottom wall of the base 32 to the outer peripheral side as it is.

  The magnetic circuit unit 18 has a protrusion 32a formed at four locations on the base 32 that comes into contact with the portion slightly stepped downward from the lower surface 16g of the frame 16 from below. 16 is positioned in the vertical direction.

  The cover member 20 is composed of a metal plate extending in a rectangular ring shape substantially along the outer peripheral edge portion 12a and the upper bulging portion 12b of the diaphragm 12, and is bonded and fixed to the outer peripheral edge portion 12a of the diaphragm 12.

  The pair of terminal members 22 are arranged so as to extend along the pair of short sides of the frame 16.

  Each of these terminal members 22 is constituted by a cantilever-shaped plate spring in which a base end portion 22 a is fixed to the frame 16. At that time, a circular punching hole 22b is formed in the base end portion 22a of each terminal member 22, and an upward bent piece 22c is formed in the end edge portion of the base end portion 22a. ing.

  The terminal member 22 is fixed to the frame 16 by soldering a solder 26 to the punching hole 22b with the base end portion 22a overlapped with the lower land portion 24b of the terminal member 24. This is done by soldering the end 22a to the upper land portion 24b.

  At that time, the bent pieces 22c of the terminal members 22 are inserted into the rectangular holes 16e formed on the lower surface of the second corner portion 16d of the frame 16 to fix the terminal members 22 to the frame 16. Positioning in the horizontal direction is intended.

  A cutout portion 16 f is formed in each of the pair of first corner portions 16 c in the frame 16. Each of these notches 16 f is cut out in a rectangular shape in plan view toward the outer peripheral surface of the long side portion of the frame 16.

  FIG. 5 is a perspective view showing a part V of FIG. 4 in detail.

  As shown in the figure, the terminal member 22 extends in the horizontal direction from the base end portion 22a toward the tip vicinity portion 22d, and then in the middle of the terminal member 22 in a downward direction (upward in FIG. 5). It is slightly curved so as to extend, is curved in a substantially J shape at the tip vicinity portion 22d and extends upward at an angle close to the vertical, and further, the tip portion 22e extends in the horizontal direction. ing.

  At this time, the terminal member 22 is formed such that an intermediate portion 22f from the base end portion 22a to the tip vicinity portion 22d extends linearly with substantially the same width in a plan view. Is widened toward the central opening 16b of the frame 16, and the portion from the upwardly extending portion 22d to the distal end 22e of the portion near the tip 22d is the amount corresponding to the above widening from the intermediate portion 22f to the central opening 16b. In the shifted state, it is formed with a narrow width (that is, a width of half or less of the width of the intermediate portion 22f) substantially the same as the above-mentioned widened portion.

  Further, the upper land portion 24 a of the terminal member 24 extends to the vicinity of the outer peripheral surface of the long side portion of the frame 16 so as to surround the notch portion 16 f formed in the first corner portion 16 c of the frame 16. A locking member 24A for locking the front end portion 22e of the terminal member 22 is formed at the front end edge of the upper land portion 24a. That is, the locking member 24A and the terminal member 24 are configured as a single member.

  The locking member 24A is formed in a substantially U shape in a side view. That is, the locking member 24A extends vertically downward so as to bend downward from the leading edge of the upper land portion 24a on both sides of the cutout portion 16f, and at the lower end portion thereof, the cutout portion 16f extends in the horizontal direction. It extends so as to cross. At this time, the locking member 24 </ b> A is formed so that the lower end edge thereof is substantially flush with the lower surface 16 g of the frame 16.

  The front end 22e of the terminal member 22 is locked by the locking member 24A in a state where the terminal member 22 is bent by a predetermined amount. This bending is caused by inserting the distal end portion 22e of the terminal member 22 into the U-shaped opening of the locking member 24A when the base end portion 22a of the terminal member 22 is soldered to the upper land portion 24b of the terminal member 24. It is obtained by pressing the base end portion 22a of the terminal member 22 against the lower land portion 24b of the terminal member 24 against the elastic repulsion force in a state of being locked to the locking member 24A.

  In the state in which the tip end portion 22e of the terminal member 22 is locked to the locking member 24A, a portion 22d in the vicinity of the tip end protrudes somewhat lower than the lower end surface of the rib-like protrusion 16h in the frame 16. ing. Since the terminal member 22 is locked to the locking member 24A in a state of being bent by a predetermined amount as described above, if the terminal member 22 is not locked, a portion near the tip of the terminal member 22 is locked. 22d is positioned further below the position indicated by the solid line in FIG.

  When the electroacoustic transducer 10 is mounted on the substrate 100 of the external device indicated by a two-dot chain line in FIG. 2, the lower end surface of the rib-like protrusion 16 h in the frame 16 comes into contact with the surface of the substrate 100. At this time, the terminal member 22 receives an upward reaction force due to the contact with the substrate 100 in the vicinity of the tip end portion 22d protruding downward from the lower end surface of the rib-like protrusion 16h. It will bend upward and deform to the position indicated by the dotted line. At that time, the distal end portion 22e of the terminal member 22 is released from the locking state with the locking member 24A, and moves upward in the cutout portion 16f of the frame 16.

  Thus, the electroacoustic transducer 10 mounted on the substrate 100 is in a state in which the vicinity 22d of the terminal member 22 is in contact with the terminal portion 102 provided on the surface side of the substrate 100 with an elastic repulsive force. It becomes. As a result, the electrical connection between the electroacoustic transducer 10 and the external device is reliably performed.

  As described above in detail, the electroacoustic transducer 10 according to the present embodiment is configured as an electrodynamic speaker including the internal magnetic type magnetic circuit unit 18, but the voice coil 14 is electrically connected to an external device. The terminal member 22 is connected to the frame 16 by a cantilever-shaped leaf spring having a base end portion 22a fixed to the frame 16, and the distal end portion of the terminal member 22 is bent in a predetermined amount. Since the metal locking member 24A for locking 22e is formed integrally with the frame 16 by insert molding, the following operational effects can be obtained.

  That is, since the locking member 24A is not a part of the synthetic resin frame 16 itself but is made of a metal member, the required strength can be ensured even if the wall thickness is reduced. Moreover, since the locking member 24A is formed integrally with the frame 16 by insert molding, the positional accuracy can be sufficiently secured, and the supporting strength can be sufficiently secured.

  As a result, the locking member 24A can have a compact configuration, so that the electroacoustic transducer 10 can be prevented from becoming large in size and can be electrically connected to an external device. It is possible to increase the degree of freedom in selecting the contact position when performing.

  At this time, since the locking member 24A is configured as a member different from the terminal member 22, the distal end portion 22e of the terminal member 22 is formed as compared with a case where these are configured as a single member. The operation of locking to the locking member 24A can be performed very easily, and the operation of positioning and fixing the terminal member 22 to the frame 16 at a predetermined position can also be easily performed.

  As described above, according to the present embodiment, in the electrodynamic electroacoustic transducer 10 having the terminal member 22 composed of a cantilever-like plate spring, this is compact and has a good workability during manufacturing. In the above, it can be set as the structure which can perform electrical connection with an external apparatus reliably.

  Moreover, in the present embodiment, the metal terminal member 24 that is electrically connected to the coil terminal 14a of the voice coil 14 is formed integrally with the frame 16 by insert molding, and at this time, a part of the terminal member 24 is formed in the lower land. Since the portion 24b is exposed on the surface of the frame 16, and the base end portion 22a of the terminal member 22 is fixedly supported by the lower land portion 24b, the conduction between the voice coil 14 and the terminal member 22 is easy. Can be aimed at.

  Furthermore, in this embodiment, since the locking member 24A and the terminal member 24 are configured as a single member, the above-described effects can be obtained with a minimum number of parts.

  In the present embodiment, the notch 16f that allows the terminal member 22 to bend and deform toward the diaphragm 12 is formed in the frame 16 in the vicinity of the locking member 24A. Can be obtained.

  That is, when the terminal member 22 is electrically connected to an external device, the terminal member 22 bends and deforms toward the diaphragm 12 side. Therefore, it is necessary to secure a movable space for the terminal member 22. In this regard, in the present embodiment, the notch portion 16f that allows the terminal member 22 to bend and deform toward the diaphragm 12 is formed in the frame 16 in the vicinity of the locking member 24A. Even if it is not arranged so as to protrude greatly from the lower surface 16 g of the frame 16, a movable space for the terminal member 22 can be secured. As a result, the locking member 24A can be made more compact, and the support strength can be further increased. In particular, the locking member 24A of the present embodiment is formed so that the lower end edge thereof is substantially flush with the lower surface 16g of the frame 16, so that the locking member 24A can be made more compact. And the support strength can be raised to the maximum.

  Further, in the present embodiment, since the tip end portion 22e of the terminal member 22 is formed with a narrow width with respect to the intermediate portion 22f, the locking member 24A can be configured more compactly.

  In the above-described embodiment, the intermediate portion 22f of the terminal member 22 has been described as being formed to extend linearly with substantially the same width in plan view. However, the intermediate portion 22f is formed so that its width changes. It is also possible to adopt a configuration formed so as to extend in a configuration or a curved shape.

  Moreover, in the said embodiment, although the locking member 24A and the terminal member 24 were demonstrated as what was comprised as a single member, these were comprised by another member and each with the flame | frame 16 by insert molding, respectively. It is also possible to adopt a structure formed integrally.

  Furthermore, in the said embodiment, although the electroacoustic transducer 10 demonstrated as what has a substantially rectangular external shape, it is set as the structure which has other external shapes (for example, square, oval, circle, etc.). It is also possible.

  Moreover, in the said embodiment, although demonstrated as what the electroacoustic transducer 10 is a small speaker, also when it is an electroacoustic transducer other than speakers, such as a receiver, the structure similar to the said embodiment. By adopting, it is possible to obtain the same operational effects as the above embodiment.

The top view which shows the electroacoustic transducer which concerns on one Embodiment of this invention in the state arrange | positioned upwards Detailed view of arrow II in Fig. 1 Detailed view of direction III in Fig. 1 Bottom view showing the electroacoustic transducer The perspective view which shows the V section of FIG. 4 in detail

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electroacoustic transducer 12 Diaphragm 12a Outer peripheral edge part 12b Upper bulging part 14 Voice coil 14a Coil terminal 16 Frame 16a Outer peripheral wall 16b Central opening part 16c 1st corner part 16d 2nd corner part 16e Rectangular hole 16f Notch part 16g Lower surface 16h Rib-shaped protrusion 18 Magnetic circuit unit 20 Cover member 22 Terminal member 22a Base end portion 22b Punched hole 22c Bending piece 22d Front end portion 22e Tip portion 22f Intermediate portion 24 Terminal member 24A Locking member 24a Upper land portion 24b Lower land Department (land part)
26 Solder 32 Base 32a Projection piece 34 Magnet 36 Yoke 100 Substrate 102 Terminal portion

Claims (4)

An electroacoustic comprising a synthetic resin frame, a diaphragm supported by the frame, a voice coil fixed to the diaphragm, and a terminal member for electrically connecting the voice coil to an external device. In the converter,
The terminal member is composed of a cantilever-shaped leaf spring having a base end fixed to the frame,
A metal locking member for locking the distal end portion of the terminal member in a state where the terminal member is bent by a predetermined amount on the frame is integrally formed with the frame by insert molding. A featured electroacoustic transducer. A metal terminal member electrically connected to the coil terminal of the voice coil is formed integrally with the frame by insert molding in a state where a part of the terminal member is exposed on the surface of the frame as a land portion. Has been
2. The electroacoustic transducer according to claim 1, wherein the terminal member is fixedly supported on a land portion of the terminal member at a base end portion of the terminal member.   The electroacoustic transducer according to claim 2, wherein the locking member and the terminal member are configured as a single member.   The electroacoustic conversion according to any one of claims 1 to 3, wherein a notch portion that allows bending deformation of the terminal member toward the diaphragm side is formed in a portion of the frame near the locking member. vessel.

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