WO2014038102A1

WO2014038102A1 - Speaker

Info

Publication number: WO2014038102A1
Application number: PCT/JP2012/084015
Authority: WO
Inventors: 真一路中石
Original assignee: NAKAISHI Shinichirou
Priority date: 2012-09-07
Filing date: 2012-12-28
Publication date: 2014-03-13
Also published as: HK1222279A1; JP2014068342A; CN203596912U; JP2015146632A; JP5731602B2; JP6250582B2

Abstract

The present invention addresses the problem of providing a speaker that exhibits high performance in reproducing original sound. In this speaker (10), the end part of a bobbin (24) on the opposite side from the bobbin end part around which a coil (48) is wound extends outwardly in the radial direction of the bobbin (24), and the flange part (52) formed from this extended part is bonded to a vibrating part (21) with a bonding agent (BND). Thus, sufficient bonding strength can be ensured by thin application of the bonding agent (BND) to just the area between the flange part (52) and the contacting part (21) of the vibrating part (21).

Description

Speaker

This invention relates to a technique for increasing the original sound reproduction ability of a speaker.

FIG. 4A is a diagram illustrating an example of the structure of a conventional sealed speaker 70. In the speaker 70 of FIG. 4A, an annular magnet 73 and an annular plate 74 surrounding the center pole 72 of the plate 71 are disposed on the back plate 71. A neck portion of the frame 75 is fixed to the front surface of the annular plate 74. A portion of the voice coil bobbin 76 around which the coil 77 is wound is accommodated in the magnetic gap GP1 which is a gap between the inner peripheral surface of the annular plate 74 and the outer peripheral surface of the center pole 72. A neck portion of the diaphragm 78 is joined to a portion of the outer peripheral surface of the boil coil bobbin 76 that is slightly away from the tip. Further, the periphery of the cap 79 is joined slightly outside the neck portion on the surface (sound emitting surface) of the diaphragm 78. The diaphragm 78 and the voice coil bobbin 76 are covered with the inner peripheral surface of the frame 75, and a damper 80 is installed between the outer peripheral surface of the bobbin 76 and the inner peripheral surface of the frame 75. The configuration of this type of speaker is disclosed in Patent Document 1, for example.

JP 2003-116197 A

As shown in the enlarged view of FIG. 4B, the joint portion of the diaphragm 78 and the bobbin 76 in this type of speaker has a configuration in which the tip of the neck portion of the diaphragm 78 is in line contact with the outer peripheral surface of the bobbin 76. The joining portion between the cap 79 and the diaphragm 78 has a configuration in which the periphery of the cap 79 is in line contact with the surface of the diaphragm 78. However, in such a configuration, if a sufficient amount of the adhesive BND is not applied to both front and rear sides of each line contact portion, the portion easily peels off. For this reason, the conventional speaker of this type has a problem that the usage fee of the adhesive, which is a substance that causes sound turbidity, increases, and it is difficult to enhance the ability to reproduce the original sound.

The present invention has been made in view of such problems, and an object thereof is to provide a speaker having a high original sound reproduction capability.

In order to solve the above problems, the present invention includes an enclosure having an opening and a cavity communicating with the opening, a vibrating portion supported on the inner periphery of the opening, and a magnetic gap. A magnetic circuit supported on the cavity side so as to face the part, and a coil is wound around the outer peripheral surface of one end, and the end on which the coil is wound is accommodated in the magnetic gap and A bobbin having an end on the opposite side to which the coil is wound and bonded to the vibrating portion, and an end on the opposite side of the bobbin on which the coil is wound is radially outward of the bobbin The speaker is characterized in that the expanded portion is bonded to the vibrating portion.

In the present invention, the end of the bobbin on the side opposite to the side where the coil is wound spreads outward in the radial direction of the bobbin, and the expanded part is bonded to the diaphragm. For this reason, if the adhesive is thinly applied only to a portion sandwiched between a portion of the vibration portion that extends outward in the radial direction of the bobbin, sufficient bonding strength can be ensured. Therefore, according to the present invention, the usage fee of the adhesive can be reduced compared to a speaker having a configuration in which the tip of the neck portion of the diaphragm is in line contact with the outer peripheral surface of the bobbin. Therefore, according to the present invention, it is possible to provide a loudspeaker having a higher ability to reproduce the original sound than a loudspeaker having a configuration in which the tip of the neck portion of the diaphragm is in line contact with the outer peripheral surface of the bobbin.

It is a front view of the speaker which is one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along line A-A ′ in FIG. 1 and a part of the cross-sectional view enlarged. It is the side view and perspective view of the bobbin in the speaker of FIG. It is sectional drawing of the conventional speaker, and the figure which expanded a part of this sectional view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a speaker 10 according to an embodiment of the present invention. FIG. 2A is a cross-sectional view taken along the line A-A ′ of FIG. An enclosure 11 of the speaker 10 has an opening 12 and a cavity 13 communicating with the opening 12. The enclosure 11 has a substantially egg shape. The thickness of the outer shell wall surrounding the cavity 13 in the enclosure 11 is uniform. The inner wall surface 14 of the enclosure 11 is curved so that the cavity 13 is substantially oval. Legs 16 are fixed to the outer wall surface 15 of the enclosure 11. The opening 12 of the enclosure 11 has a perfect circle shape. A speaker unit 20 is fitted in the opening 12.

The speaker unit 20 is a device that radiates a given electric signal as a sound wave that is an air dense wave. The speaker unit 20 includes a vibration unit 21, a frame 22 that covers the vibration unit 21 from the cavity 13 side, a magnetic circuit 23 provided at an end of the frame 22 opposite to the vibration unit 21, and vibration in the frame 22. And a bobbin 24 interposed between the portion 21 and the magnetic circuit 23.

The vibrating section 21 includes a honeycomb core 25 having a hollow honeycomb structure and two

aluminum films

26 and 27 covering the honeycomb core 25 from both sides. The

films

26 and 27 of the vibration part 21 have a perfect circle shape having a slightly smaller diameter than the opening 12. The outer periphery of the film 26 of the vibration part 21 is supported on the inner periphery of the opening 12 via an edge part 49.

The frame 22 has a substantially conical shape. The frame 22 has a perfect circular opening on one side and the other side in the axial direction. The frame 22 is fixed to the inner peripheral portion of the opening 12 of the enclosure 11 with the larger diameter of the two openings facing the vibrating portion 21.

The magnetic circuit 23 is a member in which the yoke 28, the permanent magnet 29, and the plate 30 are integrated. The magnetic circuit 23 is supported on the cavity 13 side of the part 21 so that the magnetic gap GP2 faces the vibration part 21. More specifically, the yoke 28 of the magnetic circuit 23 includes a disk portion 31 and a center pole portion 32 that shares a central axis with the portion 31. A cross section (a cross section shown in FIG. 2A) obtained by cutting a plane passing through the central axis of the disk portion 31 and the center pole portion 32 in the yoke 28 is a convex shape.

The permanent magnet 29 has an annular shape. The permanent magnet 29 has an N pole on one end face (for example, the end face 42) of the end faces 42 and 43 opposed in the thickness direction, and an S pole on the other end face (for example, the end face 43). The inner peripheral diameter of the hole in the permanent magnet 29 is larger than the outer peripheral diameter of the center pole portion 32. The end surface 42 of the permanent magnet 29 is fixed to the end surface 41 on the side where the center pole portion 32 is present in the disk portion 31. The center pole portion 32 protrudes toward the end face 43 of the permanent magnet 29 through the approximate center of the hole in the permanent magnet 29.

The plate 30 has an annular shape that is thinner than the permanent magnet 29. The inner diameter of the hole in the plate 30 is larger than the outer diameter of the center pole portion 32 and smaller than the inner diameter of the hole in the permanent magnet 29. One end face 44 of the plate 30 is fixed to the end face 43 of the permanent magnet 29. The other end face 45 of the plate 30 is fixed to an end face 46 surrounding the smaller diameter opening in the frame 22. The inner peripheral surface of the hole in the plate 30 surrounds the outer peripheral surface of the center pole portion 32 protruding from the permanent magnet 29. A gap between the inner peripheral surface of the plate 30 and the outer peripheral surface of the center pole portion 32 forms a magnetic gap GP2.

The bobbin 24 has a coil 48 wound around the outer peripheral surface of one end of a cylindrical tube portion 51 (FIG. 2B), and an end opposite to the side where the coil 48 is wound is a flange portion 52. As shown in FIG. 2 (B), the bobbin 24 is expanded outward in the radial direction. A damper 47 is installed between the outer peripheral surface of the cylindrical portion 51 of the bobbin 24 and the inner peripheral surface of the frame 22. FIG. 3A is an enlarged view of the bobbin 24 of FIG. FIG. 3B is a perspective view of FIG. As shown in FIGS. 3A and 3B, the flange portion 52 of the bobbin 24 has an annular shape. The dimension of the flange part 52 in the radial direction (the dimension of the width in the direction from the center of the flange part 52 toward the outer peripheral surface of the flange part 52) is smaller than the diameter of the cylinder part 51. Further, the end surfaces 61 and 62 facing the thickness direction of the flange portion 52 are orthogonal to the extending direction of the tube portion 51.

As shown in FIG. 2A, the end of the bobbin 24 around which the coil 48 is wound is housed in the magnetic gap GP2 of the magnetic circuit 23. Further, as shown in the enlarged view of FIG. 2B, the end surface 62 of the flange portion 52, which is the end of the bobbin 24 opposite to the side where the coil 48 is wound, is oscillated by the soft adhesive BND. 21 is adhered to the film 27. The end surface 62 of the flange portion 52 of the bobbin 24 and the film 27 of the vibration portion 21 face each other in parallel. A soft adhesive BND is applied between the end face 62 of the flange portion 52 and the film 27 of the vibration portion 21 with a substantially uniform thickness.

In this magnetic circuit 23, the magnetic lines of force generated by the permanent magnet 29 make a round of the yoke 28 and the plate 30, and the magnetic lines cross the magnetic gap GP2. For this reason, when a current of a sound signal is passed through the coil 48 of the bobbin 24, a driving force in a direction orthogonal to the extending direction of the coil 48 is given to the bobbin 24, and the vibration part in which the end of the bobbin 24 is bonded. 21 vibrates. An air density wave generated by the vibration of the vibrating portion 21 is radiated forward as a sound wave.

The above is the details of the configuration of the present embodiment. According to this embodiment, the following effects can be obtained.
First, in the present embodiment, the end of the bobbin 24 opposite to the side around which the coil 48 is wound is expanded outward in the radial direction of the bobbin 24, and the flange portion 52 which is the expanded portion. Is bonded to the vibration part 21. For this reason, if the adhesive BND is thinly applied only to a portion sandwiched between the vibration portion 21 and the flange portion 52 of the bobbin 24, sufficient bonding strength can be ensured. Therefore, according to this embodiment, the usage fee of the adhesive can be reduced as compared with a speaker having a configuration in which the tip of the neck portion of the vibrating portion is in line contact with the outer peripheral surface of the bobbin. Therefore, according to the present embodiment, it is possible to provide a loudspeaker having a higher ability to reproduce the original sound than a loudspeaker having a configuration in which the tip of the neck portion of the vibrating portion is in line contact with the outer peripheral surface of the bobbin.

Secondly, in the present embodiment, the vibration section 21 includes a honeycomb core 25 having a hollow honeycomb structure and two

aluminum films

26 and 27 sandwiching the honeycomb core 25 from both sides. For this reason, the reproduction capability of a high sound range can be made higher than the speaker which has a vibration part with another structure.

Thirdly, in the present embodiment, the portion of the end of the bobbin 24 that extends outward in the radial direction of the bobbin 24 forms an annular flange 52, and the flange 52 and the film 27 face each other in parallel. is doing. For this reason, it becomes easy to make the thickness of the adhesive BND applied between the flange portion 52 and the film 27 uniform. Therefore, according to the present embodiment, the unevenness of the adhesive BND at the joint portion between the bobbin 24 and the vibration part 21 is reduced, and the bobbin 24 is more difficult to peel off.

Fourthly, in the present embodiment, the inner wall surface 14 of the enclosure 11 is curved so that the cavity 13 forms a substantially egg shape. Therefore, according to this embodiment, the sound wave radiated from the vibrating portion 21 to the cavity 13 does not reciprocate along the inner wall surface 14. Therefore, according to the present embodiment, it is possible to suppress the occurrence of standing waves in the cavity 13.

As mentioned above, although one Embodiment of this invention was described, you may add the following modifications to this embodiment.
(1) In the above embodiment, the enclosure 11 has a substantially egg shape. However, the enclosure 11 may be rectangular.

(2) In the above embodiment, the vibration part 21 is composed of the honeycomb core 25 and the

films

26 and 27. However, you may replace this vibration part 21 with what consists of cone paper and a cap. In this case, the direction of diffusion of the flange 52, which is the end of the bobbin 24 (the end opposite to the side where the coil 48 is wound), should be the same as the angle of the tapered surface forming the outer periphery of the cone paper. .

DESCRIPTION OF

SYMBOLS

10,70 ... Speaker, 11 ... Enclosure, 12 ... Opening, 13 ... Cavity, 14 ... Inner wall surface, 15 ... Outer wall surface, 16 ... Leg, 21 ... Vibrating part, 22 ... Frame, 23 ... Magnetic circuit, 24, 76 ... Bobbin, 25 ... honeycomb core, 26, 27 ... film, 28 ... yoke part, 29 ... permanent magnet, 30 ... plate, 31 ... disk part, 32, 72 ... center pole part, 48 ... coil, 49 ... edge part, 51 ... cylinder part, 52 ... flange part, 71 ... back plate, 78 ... diaphragm, 79 ... cap.

Claims

An enclosure having an opening and a cavity communicating with the opening;
A vibrating portion supported on the inner periphery of the opening;
A magnetic circuit having a magnetic gap and supported on the cavity side so that the magnetic gap faces the vibrating portion;
A coil is wound around the outer peripheral surface of one end, the end on which the coil is wound is stored in the magnetic gap, and the end opposite to the side on which the coil is wound is the vibrating portion. And a bobbin bonded to
The speaker is characterized in that an end of the bobbin opposite to the side where the coil is wound widens outward in the radial direction of the bobbin, and the widened part is bonded to the vibrating part. .
The vibrating part is
The speaker according to claim 1, comprising a honeycomb core having a hollow honeycomb structure and two aluminum films sandwiching the honeycomb core from both sides.
A portion of the end portion of the bobbin that extends outward in the radial direction of the bobbin forms an annular flange portion, and the flange portion and the film on the cavity side of the two films face each other in parallel. The speaker according to claim 2, wherein:
The speaker according to claim 3, wherein the inner wall surface of the enclosure is curved so that the cavity has an approximately egg shape.