JP5781951B2 - Thin speaker - Google Patents

Description

  The present invention relates to a thin speaker, and more particularly to a voice coil mounting structure.

  As described in Patent Document 1, as a thin speaker capable of reducing the overall height, a support piece is inserted into a plurality of slits provided in a yoke, and a voice coil and a diaphragm are coupled by these support pieces. A proposed speaker has been proposed.

  FIG. 5 is a schematic sectional view of a conventional thin speaker described in Patent Document 1, and FIG. 6 is a top view of a peripheral portion of the magnetic circuit in FIG. 5 and 6, the yoke 1 is formed in a bottomed cylindrical shape, a plurality of slits 2 are formed radially in the cylindrical portion, and a columnar magnet 3 is formed on the bottom surface of the cylindrical portion. The disk-shaped center pole 4 is fixed to the upper surface of the magnet 3.

  The yoke 1, the magnet 3 and the center pole 4 constitute an inner magnet type magnetic circuit, and this magnetic circuit is attached to the bottom surface of the frame 5 formed in a dish shape. An annular magnetic gap 6 is formed between the inner peripheral surface of the yoke 1 and the outer peripheral surface of the center pole 4.

  An annular voice coil 7 is disposed in the annular magnetic gap 6. One end of a plurality of support pieces 8 inserted in the slit 2 of the yoke 1 is radially attached to the outer peripheral surface of the voice coil 7, and the other end of these support pieces 8 is attached to and supported by the inner peripheral portion of the damper 9. Has been. The outer peripheral portion of the damper 9 is attached to a stepped portion 5 a of the frame 5.

  A vibration plate 10 is provided on the upper surface of the damper 9. The inner peripheral portion of the diaphragm 10 is attached to the outer peripheral portion of the support piece 8, and the outer peripheral edge portion is supported by the upper surface portion of the frame 5. That is, the support piece 8 functions as a coupling member that couples the voice coil 7 and the diaphragm 10.

  FIG. 7 shows a connecting member in which a ring 11 is attached to the outer peripheral surface of the support piece 8 shown in FIG. In this case, the damper 9 and the diaphragm 10 are attached to the outer peripheral surface of the ring 11.

  In these configurations, when an electrical signal is input to the voice coil 7, a vertical driving force is generated in the voice coil 7 in accordance with the direction of the electrical signal based on Fleming's left-hand rule. The vertical driving force generated in the voice coil 7 is transmitted to the diaphragm 10 through the coupling member. As a result, the diaphragm 10 vibrates in the vertical direction, causing the air to vibrate in the vertical direction, and sound is generated.

  Here, paying attention to the vertical vibration of the diaphragm 10, even when a large electric signal is input to the voice coil 7 and vibrates greatly to generate a large volume, the diaphragm 10 hits the upper surface of the yoke 1. There is no.

  Therefore, when designing the overall height of the speaker, it is not necessary to allow for a margin for avoiding the diaphragm 10 from colliding with the upper surface of the yoke 1 due to the vertical vibration of the diaphragm 10 at the time of maximum input. A low-profile speaker can be realized.

JP-A-55-64500

  By the way, in these conventional configurations, an adhesive is used to fix the voice coil 7 and the support piece 8 together.

  However, the adhesive strength between the voice coil 7 and the support piece 8 by the adhesive is relatively weak against vibration, and it is not always a situation where a practically sufficient strength is obtained.

  The present invention solves such a problem, and an object of the present invention is to realize a thin speaker in which a voice coil and a coupling member are fixed with a practically sufficient strength against vibration.

  To achieve the above object, the invention according to claim 1 of the present invention is a yoke having a bottomed cylindrical shape and a plurality of slits radially formed in the cylindrical portion, and the yoke. A cylindrical magnet fixed to the bottom surface of the cylindrical portion and a disc-shaped center pole fixed to the top surface of the magnet constitute an inner magnetic circuit, and the inner peripheral surface of the yoke and the center pole In a thin speaker in which an annular magnetic gap is formed between the outer circumferential surface of the yoke and an annular voice coil is inserted into the magnetic gap, the voice coil is ring-shaped so as to surround the outer circumference of the yoke. And a support body in which a plurality of support pieces to be inserted into the slits of the yoke are radially provided on the inner peripheral surface thereof, and the voice coil is sandwiched from the inner peripheral surface and the tip portion thereof is Characterized in that the movably mounted along the axial direction of the yoke in the attachment piece which is formed in a substantially U-shaped so as to secure the supporting pieces.

  According to a second aspect of the present invention, in the thin speaker according to the first aspect, the support and the support piece are integrally formed of metal.

  According to a third aspect of the present invention, in the thin speaker according to the first aspect, the support and the support piece are integrally formed of a synthetic resin.

  According to a fourth aspect of the present invention, in the thin speaker according to any one of the first to third aspects, the mounting piece is made of metal.

  According to a fifth aspect of the present invention, in the thin speaker according to any one of the first to third aspects, the mounting piece is made of a synthetic resin.

  A sixth aspect of the present invention is the thin speaker according to any one of the first to fifth aspects, wherein the voice coil is wound around a bobbin.

  As a result, the voice coil is mechanically fixed to the coupling member via the attachment member, and a thin speaker having a practically sufficient strength against vibration can be configured.

It is a schematic sectional drawing (BB sectional drawing of FIG.4 (C)) which shows the embodiment of this invention. It is composition explanatory drawing which shows the specific example of the support body 12 used by this invention. It is explanatory drawing of expansion structure which shows the specific example of the attachment piece 13 used by this invention. It is explanatory drawing of the incorporating procedure of the voice coil 7 based on this invention. It is a structural sectional view of a conventional thin speaker. It is a top view of the magnetic circuit peripheral part of FIG. A ring 11 is attached to the outer peripheral surface of the support piece 8 shown in FIG.

  FIG. 1 is a schematic cross-sectional view showing an embodiment of the present invention, and the same reference numerals are given to portions common to FIG. The difference between FIG. 1 and FIG. 5 is the attachment structure of the voice coil 7. In FIG. 1, the yoke 1 is formed in a bottomed cylindrical shape, a plurality of slits 2 are radially formed in the cylindrical portion, and a columnar magnet 3 is fixed to the bottom surface of the cylindrical portion, A disc-shaped center pole 4 is fixed to the upper surface of the magnet 3.

  The yoke 1, the magnet 3 and the center pole 4 constitute an inner magnet type magnetic circuit, and this magnetic circuit is attached to the bottom surface of the frame 5 formed in a dish shape. An annular magnetic gap 6 is formed between the inner peripheral surface of the yoke 1 and the outer peripheral surface of the center pole 4.

  An annular voice coil 7 is attached to the annular magnetic gap 6 via a support 12 and an attachment piece 13 so as to be movable along the axial direction of the yoke 1. The support 12 is formed in a ring shape so as to surround the outer periphery of the yoke 1, and a plurality of support pieces to be inserted into the slits 2 of the yoke 1 are provided radially on the inner peripheral surface thereof. The attachment piece 13 is formed in a substantially U shape so as to sandwich the voice coil 7 from the inner peripheral surface, and its tip end portion is formed so as to be fixed to the support piece.

  FIG. 2 is a structural explanatory view showing a specific example of the support 12 used in the present invention, in which (A) is a top view, (B) is a side partial sectional view, and (C) is a bottom view. In FIG. 2, the support 12 is formed in a ring shape so as to surround the outer periphery of the yoke 1, and three support pieces 12 a inserted into the slits 2 of the yoke 1 are formed at an angle of 120 degrees on the inner peripheral surface thereof. It is provided radially at intervals.

  Mounting holes 12b and 12c for inserting and fixing the tip of the mounting piece 13 are provided on the upper and lower surfaces of the support piece 12a. Two of the three support pieces 12a are provided with guide grooves 12d for guiding lead wires for connecting the voice coil 7 to the outside.

  3A and 3B are enlarged configuration explanatory views showing a specific example of the mounting piece 13 used in the present invention. FIG. 3A is a side view, FIG. 3B is a front view, and FIG. In FIG. 3, the attachment piece 13 is formed in a substantially U shape so as to sandwich the voice coil 7 from the inner peripheral surface and insert and fix the tip portion thereof into the attachment holes 12b and 12c of the support piece 12a.

  The length of the bent upper piece 13a is approximately twice as long as that of the lower bent piece 13b, and the center position Pa of the tip portion 13c of the bent upper piece 13a is relative to the center position Pb of the tip portion 13d of the bent lower piece 13b. Is biased. This facilitates the work of sandwiching the voice coil 7 formed in a ring shape from the inner peripheral surface and inserting the tip portions 13c, 13d into the mounting holes 12b, 12c of the support piece 12a.

  FIG. 4 is an explanatory diagram of a procedure for incorporating the voice coil 7. (A) shows the support 12. (B) is a state in which the voice coil 7 is sandwiched from the inner peripheral surface by the mounting piece 13 formed in a substantially U-shape, and the tip portion is inserted into the mounting holes 12b and 12c of the support piece 12a and fixed with an adhesive. Is shown.

  (C) shows a state in which the voice coil 7 fixed to the support piece 12a of the support body 12 via the attachment piece 13 as shown in FIG. Yes. That is, the support 12 is fitted to the outer periphery of the yoke 1, the three support pieces 12 a are fitted to the slit 2 of the yoke 1, and the voice coil 7 is between the inner peripheral surface of the yoke 1 and the outer peripheral surface of the center pole 4. Is fitted into an annular magnetic gap 6 formed in

  As a result, the voice coil 7 is attached so as to be movable along the axial direction of the yoke 1.

  When a voice coil 7 mounting structure according to the present invention was used to assemble a speaker having a thickness of about 30 mm and a diameter of 200 mm and subjected to a rated input test of 100 hours of continuous driving at a rated input of 60 W, the voice coil 7 from the support 12 Dropout did not occur. Therefore, it can be judged that practically sufficient strength is obtained.

  In the above-described embodiment, the example in which the support 12 and the support piece 12a are formed by cutting an aluminum member into a predetermined shape has been described. However, the present invention is not limited to this example. While forming into a shape, the voice coil 7 may be inserted and fixed.

  Further, the support body 12 and the support piece 12a may be formed by being divided in the vertical direction, and the voice coil 7 may be fixed so as to be sandwiched from above and below.

  The attachment piece 13 may also be a metal plate bent into a predetermined shape, or may be formed into a predetermined shape with a heat-resistant synthetic resin.

  Furthermore, the voice coil 7 may be wound around a bobbin or may be a bobbin-free one.

  As described above in detail, according to the present invention, it is possible to realize a thin speaker in which a voice coil and a coupling member are fixed to vibration with a practically sufficient strength.

DESCRIPTION OF SYMBOLS 1 Yoke 2 Slit 3 Magnet 4 Center pole 5 Frame 6 Magnetic gap 7 Voice coil 9 Damper 10 Diaphragm 12 Support body 13 Attachment piece

Claims (6)

A yoke having a bottomed cylindrical shape with a plurality of slits radially formed in the cylindrical portion, a columnar magnet fixed to the bottom surface of the cylindrical portion of the yoke, and a top surface of the magnet. The disc-shaped center pole forms an inner magnet type magnetic circuit, and an annular magnetic gap is formed between the inner peripheral surface of the yoke and the outer peripheral surface of the center pole. In a thin speaker in which the formed voice coil is inserted and arranged,
The voice coil is
A support body formed in a ring shape so as to surround the outer periphery of the yoke, and a plurality of support pieces inserted radially into the slits of the yoke on its inner peripheral surface, and the voice coil is sandwiched from the inner peripheral surface A thin speaker, characterized in that it is mounted so as to be movable along the axial direction of the yoke with a mounting piece formed in a substantially U shape so that its tip end portion is fixed to the support piece.   2. The thin speaker according to claim 1, wherein the support body and the support piece are integrally formed of metal.   The thin speaker according to claim 1, wherein the support and the support piece are integrally formed of a synthetic resin.   The thin speaker according to any one of claims 1 to 3, wherein the mounting piece is made of metal.   The thin speaker according to any one of claims 1 to 3, wherein the mounting piece is made of a synthetic resin.   The thin voice speaker according to claim 1, wherein the voice coil is wound around a bobbin.

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