JP3057271B2 - Speaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction type loudspeaker, and more particularly to an improvement in mounting a diaphragm.

[0002]

2. Description of the Related Art FIG. 4 shows a configuration of a speaker according to a conventional technique disclosed in Japanese Patent Application Laid-Open No. 2-31598. FIG.
The speaker shown in FIG. 1 has a flange-shaped yoke 1 having an inverted T-shaped cross section and having a center pole 6 planted at the center, and a ring-shaped magnet 2, a ring-shaped plate 3, and a funnel-shaped Are sequentially fixed.

On the top of the center pole 6 of the yoke 1, a cylindrical damper 7 is arranged, and on this damper 7, a dome-shaped diaphragm 8 is arranged.

[0004] The diaphragm 8 is disposed within the inner diameter of the cylindrical bobbin 13. The dome-shaped diaphragm 8 has a bobbin 13
Has an extension 8a extending into the magnetic gap. Bobbin 1
A voice coil functioning as a primary coil 14 is wound around 3. The bobbin 13 is held by a damper 15 whose outermost peripheral edge is fixed to the frame 4.

[0005] A cone-shaped diaphragm 17 is attached to the bobbin 13, and the diaphragm 17 is held at a maximum diameter portion of the frame 4 via an edge 18.

In the speaker configured as described above, 1
A relatively low-frequency sound output is generated from the diaphragm 17 which is directly driven through the bobbin 13 by the voice coil 14 serving as a secondary coil, while the extension of the metallic dome-shaped diaphragm 8 functioning as a secondary coil is generated. The setting portion 8a generates a relatively high frequency sound output by the induced magnetic flux from the primary coil.

[0007]

By the way, in the speaker as shown in FIG.
It is desired that the clearance d1 between the inner diameter of the center pole 6 and the outer diameter of the extension 8a of the diaphragm 8 and the inner diameter of the bobbin 13 be on the order of 1 mm or less in terms of performance. , Their clearance d1,
It is desirable that d2 be constant over the entire circumference of the diaphragm 8 so that the outer diameter of the center pole 6 and the inner diameter 13 of the bobbin do not touch when the diaphragm 8 vibrates.

However, the speaker of FIG. 4 has a problem that the centering of the damper 7 is not easy, and the centering of the diaphragm 8 is not easy. That is,
There is a problem that it is difficult to secure the accuracy of the clearances d1 and d2, and the yield is deteriorated.

The present invention has been made in view of such a problem, and has as its object to provide a speaker capable of easily and accurately positioning a damper of a diaphragm.

[0010]

As shown in FIG. 1, for example, the speaker according to the present invention has an inner periphery of a bobbin 42 on which a primary coil 43 constituting a vibration system for driving a first diaphragm 41 is wound. A speaker in which a dome-shaped second diaphragm 34 in which an extension 43a guided by a primary coil 43 is made of metal is arranged coaxially with the first diaphragm 41 between the first diaphragm 41 and the outer periphery of the center pole 23. A shaft 35 fitted into a hole 39 formed in the center of the dome-shaped second diaphragm 34 and a flange portion 33a that covers the upper part of the dome-shaped second diaphragm 34 The disk portion 30 having the notch 31 into which the inner diameter of the ring-shaped damper 27 holding the second diaphragm 34 is held, and the outer diameter of the damper 27 is the second diaphragm 34 Is held at the inner diameter of the extension portion 34a of the And a support member 28 comprising a shaft portion 29 extending downward from the center position. The shaft portion 29 of the support member 28 is inserted into the through hole 22 formed in the center of the center pole 23. The damper 27 is inserted and the damper 27 is mounted on the center pole 23, and the tip of the shaft 35 of the holding member 33 is inserted into a hole 36 formed on the disk portion 30 of the support member 28 so that the center of the second diaphragm 34 is moved. It is determined.

[0011]

According to the loudspeaker of the present invention, the supporting member 28 is the second
A notch 31 at the lower portion of the disk portion 30 corresponding to the shape of the vicinity of the inner periphery of the ring-shaped damper 27 supporting the diaphragm 34, and a bottom portion of the disk portion 30 facing the top of the center pole 23 and a center of the center pole 23. A shaft portion 29 is inserted into the through hole 22. The damper 27 is sandwiched and held between the notch 31 of the disk portion 30 and the top of the center pole 23, and is inserted into the through hole 22 formed in the center pole 23. By doing so, the center position of the damper 27 can be accurately aligned with the axis 23A of the through hole 22 formed in the center pole 23, and the second
The centering of the damper 27 of the diaphragm 34 becomes easy.

Further, the shaft 35 of the holding member 33 for holding the second diaphragm 34 is inserted into a hole 36 formed in the center of the upper part of the disk portion 30 of the supporting member 28, and the bobbin of the second diaphragm 34 is inserted. Since the center position is accurately held in the center 42 and the centering is performed, the clearance d ₃ between the inner diameter of the extending portion 34 a of the second diaphragm 34 and the outer diameter of the center pole 23 and the inner diameter of the bobbin 42 are adjusted. it is possible to define a clearance d ₄ to the outer diameter of the extension portion 34a accurately.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the speaker according to the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a speaker according to this embodiment. The speaker shown in FIG. 1 has a disk-shaped flange 24, a center pole 23 is planted at the center of the flange 24, and a through hole 22 is formed at the center of the center pole 23.
To form an inverted T-shaped yoke 21.

The ring-shaped magnet 2 is joined on the flange 24, and the ring-shaped plate 3 and the funnel-shaped frame 25 are sequentially fixed on the upper side of the magnet 2.

On the top 26 (see FIG. 2) of the center pole 23 of the yoke 21, a ring-shaped damper 27 having a relatively small thickness is arranged. The damper 27 is formed of an elastic material such as rubber.

The damper 27 includes a disk 30 and a shaft 2.
The shaft 29 of the supporting member 28 made of
3 is positioned and fixed. That is, the damper 27 is centered with respect to the axis 23A of the center pole 23. To elaborate,
The diameter of the shaft portion 29 of the support member 28 is formed to be a diameter that can be inserted into the diameter of the through hole 22, and the lower surface of the disk portion 30 of the support member 28 is formed in a planar shape at the portion that contacts the top 26 of the center pole 23. A ring-shaped notch 31 (see FIG. 2) corresponding to the vicinity of the inside of the ring-shaped damper 27 is formed on the outer peripheral portion of the portion of the disk portion 30 of the support member 28 which contacts the top portion 26 of the center pole 23. ing. Therefore, the damper 27 is pressed and held by the support member 28.

The support member 28 can be manufactured by integral molding using an ABS resin or the like. An adhesive is applied to the through hole 22 and the top portion 26 of the center pole 23 and joined at the end of assembly.

The through hole 22 of the center pole 23 has a hole 22a or the like formed in a top portion 26 as shown in FIG. 2, and a shaft portion 29 of a support member 28 is formed in a shape corresponding to the shape of the hole 22a. If the shaft part 29 of the supporting member 28 is
, The damper 27 can be centered.

In order to center the ring-shaped damper 27, the support member 28 is formed with a notch 31 corresponding to the shape near the inner circumference of the damper 27 and the hole 22 or 22 a of the top 26 of the center pole 23. What is necessary is just to form so that it may have the part which the shaft part 29 which contacts and the top part 26 of the center pole 23 and the bottom part of the disk part 30 contact.

Further, a leading end of a shaft 35 of a holding member 33 having a shaft portion 35 and a substantially flange-shaped flange portion 33a which is guided by a primary coil 43 and holds a substantially dome-shaped diaphragm 34 functioning as a secondary coil. By inserting it into a hole 36 formed in the center of the disk portion 30 of the support member 28, the centering of the diaphragm 34 with respect to the axis 23A is performed.

The shape of the base of the shaft 35 is
Is formed in a diameter corresponding to the hole 39 formed on the top of the diaphragm 34, and the bottom of the flange portion 33a of the holding member 33 is formed in a shape corresponding to the top around the hole 39 of the diaphragm 34. A portion where the vibration plate 34 and the holding member 33 are in contact with each other is joined with an adhesive or the like.

The second diaphragm 34 and the holding member 3 as described above
3 is inserted into a hole 36 formed in the upper part of the disk 30 of the support member 28, and the damper 27 is inserted into the extension 34a.
Of the center pole 23, and the inner circumference of the center pole 23 is inserted into the notch 31 of the disc 30.
Then, an adhesive is applied to the inside of the through hole 22, and the sub-assembled second vibration system including the holding member 33, the second vibration plate 34, the support member 28, and the damper 27 constitutes a first vibration system. The bobbin 42 is inserted into the bobbin 42, and the centering is performed with respect to the axis 23 </ b> A which is the center of the through hole 22 of the center pole 23.

By such centering, the center pole 2
3 the outer diameter of the outer span of the clearance d ₄ of the inner diameter and the extending portion 34a of the bobbin 42 of the clearance d ₃ and the first diaphragm 41 between the inner diameter of the extending portion 34a of the second diaphragm 34 is constant Retained by value.

The first diaphragm 41 is constructed in the same manner as in FIG. 4, and has an inner periphery fixed to the outer periphery of the bobbin 42, an outer periphery fixed to the frame 25 via the edge 40, and a damper 40 such as cloth.
Has an outer periphery at the bottom of the frame 25 and an inner periphery at the bobbin 42.
The second diaphragm 34 and the like are inserted through the upper opening of the cylindrical bobbin 42. Bobbin 42
, A primary coil 43 is wound. In addition, bobbin 4
Centering with respect to the second axis 23A is performed in advance.

In the speaker configured as described above, 1
A relatively low-frequency sound output is generated from a diaphragm 41 (generally, a woofer diaphragm) driven directly through the bobbin 42 by the secondary coil 43, while the spread of the metal plate induced by the primary coil is generated. The installation portion 34a functions as a secondary coil, and a relatively high frequency sound output is generated from the diaphragm 34 (generally, a tweeter diaphragm).

As described above, according to the above-described embodiment, the support member 28 has the notch 31 formed in a shape corresponding to the shape of the inner circumference of the damper 27, the top 26 of the center pole 23, and the through hole 22. Disk part 3 formed in a shape corresponding to
0 and a shaft portion 29. Therefore, the support member 2
8, a part of the disc portion 30 and the shaft 29 can be fitted into the top portion 26 and the through hole 22 of the center pole 23, and the damper 27 is supported by the notch 31. Therefore, the positioning of the damper 27, that is, the centering is facilitated.

In other words, of the support member 28, the top portion 26 of the center pole 23 and a part of the disk portion 30 formed in a shape corresponding to the through hole 22 and the shaft portion 29 are formed with the top portion 26 of the center pole 23. The centering of the support member 28 is automatically performed by being fitted into the through hole 22, and the notch formed in a shape corresponding to the shape of the inner circumference of the damper 27 formed in the support member 28. 31, the position of the damper 27 is regulated, and eventually,
The position of the damper 27 is pressed and held by the support member 28, and the centering of the damper 27 with respect to the axis 23A of the center pole 23 is automatically completed.

Further, the centering corresponding to the axis 23A of the second diaphragm 34 is performed by inserting the tip of the shaft 35 of the holding member 33 into a hole 36 formed in the upper part of the disk portion 30 of the supporting member 28. The centering of the second diaphragm is performed.

As described above, the centering of the second diaphragm 34 and the damper 2 with respect to the through hole 22 formed in the center pole 23 are performed.
Since the centering of the speaker 7 can be easily performed, the yield and productivity of the speaker of FIG. 1 are improved. In addition, since the positioning can be performed accurately, the clearances d3 and d4 can be set to minimum values. As a result, the sensitivity of the magnetic circuit formed by the primary coil 43, the plate 3, the magnet 2, the yoke 21, the extended portion 34a of the diaphragm 34 as the secondary coil, and the like can be increased, and the manufacturing is also performed from this point. This has the effect of reducing costs.

The damper 27 is not a simple ring as shown in FIG. 1 but a damper 45 having a cylindrical edge 44 attached to the ring damper 27 as shown in FIG. By forming the same, a similar centering effect on the diaphragm 34 can be obtained.

Further, the present invention is not limited to the above-described embodiment, but can adopt various configurations without departing from the gist of the present invention.

[0033]

As described above, according to the loudspeaker of the present invention, the support member has the notch corresponding to the shape near the inner circumference of the ring-shaped damper and the bottom surface of the disk portion corresponding to the top of the yoke. A shaft that is inserted into a through hole formed in the center pole, the shaft portion can be fitted into the through hole formed in the center pole of the yoke among the support members, and the damper has a cut-off portion. Since the support is provided by the notch, the positioning of the damper, that is, the so-called centering becomes easy, and the centering of the second diaphragm 34 is also performed by inserting the tip of the shaft of the holding member into the hole formed in the disk portion of the supporting member. By doing so, the centering can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of an embodiment of a speaker according to the present invention.

FIG. 2 is a side sectional view of another configuration in which a partial configuration of the example of FIG. 1 is enlarged.

FIG. 3 is an enlarged side sectional view showing a partial configuration of a speaker including another configuration example of a damper.

FIG. 4 is a side sectional view showing a configuration of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Yoke 22 Through-hole 23 Center pole 26 Top part 27 Damper 28 Support member 29 Shaft part 30 Disk part 31 Notch

Claims (1)

(57) [Claims] An extended portion guided by the primary coil between the inner circumference of a bobbin around which a primary coil is wound and the outer circumference of a center pole, which constitutes a vibration system for driving a first diaphragm, is made of metal. A loudspeaker in which a configured second dome-shaped diaphragm is disposed coaxially with the first diaphragm, the speaker being fitted into a hole formed at a center position of the second dome-shaped diaphragm. And a holding member comprising a flange portion that covers an upper portion of the dome-shaped second diaphragm, and an inner diameter of a ring-shaped damper that holds the second diaphragm is fitted to a lower surface of the holding member. A disk member having a notch and an outer diameter of the damper held by the inner diameter of the extending portion of the second diaphragm, and a support member comprising a shaft portion extending downward from a center position of the disk portion; The shaft of the support member is inserted into a through hole formed in the center of the center pole, and the Is mounted on a center pole, and the tip of the shaft of the holding member is inserted into the hole drilled on the disk portion of the support member to define the center of the second diaphragm. Speaker.