JP2002199489A - Loudspeaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a loudspeaker, the assembling of which can be automated easily and the height of the product of which can be managed easily. SOLUTION: A 1st frame assembly 1, consisting of a permanent magnet 13, a yoke 12, a top plate 14 and a 1st frame 11 to which the yoke is imbedded, is combined with a 2nd frame assembly 2 consisting of a diaphragm 23 fixed to a 2nd frame 21 and a voice coil 24 fixed to the diaphragm 23. The diaphragm 23 is joined with a face of the 2nd frame assembly 2, opposed to the 1st frame assembly 1. A coil terminal 24a is led out along the diaphragm 23, in the outer circumferential direction and tangled with a terminal 22a being one end of a lead frame 22 imbedded in the 2nd frame 21 and is fixed through fusing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a speaker used for a mobile communication device or the like.

[0002]

2. Description of the Related Art In recent years, a thin and high-performance electrodynamic speaker has been widely used as an acoustic device of a mobile communication device such as a portable telephone. In addition, since the dimensions of the speaker, particularly the height of the product, are required to be as thin as possible, strict control is required. An example of such a conventional speaker will be described with reference to the drawings. FIG. 5 is a sectional view of a conventional electrodynamic speaker.

[0003] First, the configuration of this speaker will be described. In FIG. 5, reference numeral 51 denotes an annular case having an inner peripheral step 51a and an intermediate step 51b. Reference numeral 52 denotes a dish-shaped yoke made of a magnetic material embedded inside the case 51. Numeral 53 denotes a disk-shaped permanent magnet fixed to the center of the inner surface of the yoke 52 and magnetized in the vertical direction.
3 is a disk-shaped top plate fixed to the upper surface of the plate 3.
A magnetic circuit is formed by the permanent magnet 53 through a gap between the upper end of the yoke 52 and the outer periphery of the top plate 54.

Reference numeral 55 denotes a substantially spherical diaphragm integrally formed of a plastic material having a flat portion 55a near the periphery and a curved portion following the flat portion 55a. It is adhesively fixed to the step 51b. Reference numeral 56 denotes a voice coil, which is a cylindrical air-core coil in which coil windings, which are enamel-coated copper wires, are wound in a rectangular cross section and solidified with paint, and the upper surface is bonded to the lower surface of the flat portion 55a of the diaphragm 55. Fixed. The voice coil 56 is fitted into a gap between the outer peripheral portion of the top plate 54 and the upper end portion of the yoke 52 at a depth of approximately half the coil length.
Reference numeral 57 denotes a protector for protecting the diaphragm 55 whose peripheral portion is fixed to the intermediate step portion 51b of the frame 51. Reference numeral 58 denotes a lead frame provided on the lower surface of the case 51 and serving as an external connection terminal, to which a terminal 56a of the voice coil 56 is connected.

Next, a method of assembling the speaker will be described. First, one surface of the permanent magnet 53 is bonded to the center of the yoke 52, and then the top plate 54 is bonded and fixed to the other surface of the permanent magnet 53 with their mutual center positions aligned.
On the other hand, the voice coil 56 is bonded to the flat portion 55a of the diaphragm 55. Next, the diaphragm 55 to which the voice coil 56 is bonded is bonded to the intermediate step 51b of the frame 51. At this time, the coil terminal 56a is pulled out from the notch of the frame 51 (not shown) to the outer periphery and connected to the lead frame 58 on the lower surface of the frame 51 by soldering or the like. Finally, the protector 57 is adhered from above the diaphragm 55 to complete it. When an audio signal is input to the voice coil 56 of the speaker,
In accordance with Fleming's left-hand rule, the diaphragm 55 vibrates up and down to emit sound.

[0006]

However, in the conventional speaker having such a configuration, since the diaphragm 55 and the protector 57 are laminated and adhered to the frame 51 on a manual assembly line, the lower surface of the yoke is not provided. It is difficult to accurately control the product height of the speaker, which is the distance between the speaker and the upper surface of the protector.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a speaker which has a structure suitable for automatic assembly and whose product height can be easily controlled.

[0008]

In order to achieve the above-mentioned object, according to the present invention, there is provided a permanent magnet, a yoke fixed to one magnetic pole of the permanent magnet, and a permanent magnet. A first frame assembly including a top plate fixed to a magnetic pole side, a first frame in which the yoke is embedded, a diaphragm, a voice coil fixed to the diaphragm, and a second frame fixed to the diaphragm Wherein the diaphragm is fixed to a surface of the second frame facing the first frame.

According to a second aspect of the present invention, in the configuration of the first aspect, a lead frame is embedded in the second frame, and one end of the lead frame is disposed on an outer periphery of the first frame. The other end is arranged to extend to the lower surface of the first frame.

According to a third aspect of the present invention, in the configuration of the second aspect, the coil terminal of the voice coil is joined to the one end of the lead frame disposed on the outer periphery of the first frame. It is characterized by having been done.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a process of assembling the speaker of FIG. 1, FIG. FIG. 4 is a sectional view showing an assembly process of the lead frame of the speaker of FIG.

First, the configuration of an electrodynamic loudspeaker according to an embodiment of the present invention will be described. In FIG. 1, reference numeral 1 denotes a first frame assembly, 2 denotes a second frame assembly, and the speaker comprises a first frame assembly 1 and a second frame assembly 2.
And are united. The configuration of the first frame assembly 1 will be described. Reference numeral 11 denotes a first frame which is an annular resin molded product, and a yoke described later is embedded therein. On the outer periphery of the first frame 11, a ridge 11a is formed, which is an engaging portion with the second frame described later. An abutting surface 11b with a second frame, which will be described later, is formed outside the ridge 11a. Reference numeral 12 denotes a dish-shaped yoke having a flange formed of a magnetic material and embedded in the first frame 11. 1
Numeral 3 is a disk-shaped permanent magnet magnetized in the vertical direction.
Reference numeral 4 denotes a top plate adhered to the upper surface of the permanent magnet 13. A magnetic circuit is formed from the bottom surface of the yoke 12, passes through the center of the permanent magnet 13 and the top plate 14, and passes through a gap with the upper end of the yoke 12.

The structure of the second frame assembly 2 will be described. An upper cover 21 is an annular resin molded product as a second frame. The second frame 21 has an upper portion 21
a and a lower step portion 21b that engages with the ridge portion 11a of the first frame 11 is formed. 22 is the second frame 21
And one end thereof is exposed to the outer periphery and pulled out to form a terminal 22a with a tab. The other end is exposed to the outer periphery in the opposite direction, pulled out, and extends to the lower surface of the first frame 21. 23 is a diaphragm of a resin molded product whose outer peripheral edge is bonded and fixed to the lower step 21b of the second frame 21,
Reference numeral 24 denotes a voice coil adhered and fixed to the lower surface of the diaphragm 23. The voice coil 24 is an annular air-core coil in which coil windings, which are copper wires coated with enamel, are wound in a rectangular cross section and solidified with paint. The coil terminal 24a is pulled out from the upper end of the voice coil 24 toward the outer periphery, and the second frame 2 (not shown)
One notch is connected to each of the pair of terminals 22a. 25 is the upper part 21 of the second frame 21
This is a protector that is a flat plate with a sound emission hole for preventing damage to the diaphragm 23 bonded and fixed to a.

Next, a method of manufacturing the speaker according to the present embodiment will be described with reference to FIGS. First, the first frame assembly 1 and the second frame assembly 2 are assembled. The first frame assembly 1 is completed by laminating the permanent magnet 13 and the protector 14 on the yoke 12 in this order and bonding and fixing them. The second frame assembly 2 first forms the voice coil 24 using a coil winding machine, and adheres a preformed diaphragm 23 before removing the voice coil 24 from the core of the winding machine. Finally, the protector 25 is bonded to the upper portion 21a of the second frame 21 to complete the same. next,
As shown in FIG. 2, the first frame assembly 1 is fitted to the second frame assembly 2 removed from the winding machine, and the abutting surface 11b of the first frame 11 and the lower end surface of the second frame 21 are aligned. Fix by ultrasonic welding. At this time, the periphery of the diaphragm 23 is held between the first and second frames 11 and 21.

Next, as shown in FIGS. 3A and 3B, the coil terminal 24a is entangled with the terminal 22a, the tab is bent and sandwiched, and fixed by fusing. Finally, as shown in FIG.
At right angles to the other lead frame 22
Is also bent and settled on the lower surface of the first frame 11 to complete the assembly.

Next, effects of the present embodiment will be described. Since the loudspeaker frame is divided into two and the assembly is configured in advance for each of the two frames, automation of the assembly is facilitated. In particular, since the diaphragm 23 is fixed to the surface of the second frame 21 facing the first frame 11, the diaphragm 23 is fixed to the first frame 11 and the second frame 21.
And it can be fixed firmly.
Further, the height of the product is easily controlled because the bonding portion is the 231 layer of the vibration plate. In addition, since the coil terminal can be pulled out along the lower surface of the diaphragm 23 in the same direction as the terminal 22a, automatic processing of the coil terminal is facilitated. The lead frame 22 disposed on the lower surface of the first frame 11 is used as a service terminal for the user.

[0017]

As described above, according to the present invention,
A first frame assembly including a permanent magnet, a yoke fixed to one magnetic pole side of the permanent magnet, a top plate fixed to the other magnetic pole side, and a first frame having the yoke embedded therein; A voice coil fixed to the diaphragm and a second frame to which the diaphragm is fixed.
Because the structure is combined with the frame assembly, the speaker assembly can be easily automated. Further, since the diaphragm is fixed to the surface of the second frame facing the first frame, the diaphragm can be firmly fixed.

A lead frame is embedded in the second frame, one end of the lead frame is disposed on the outer periphery of the first frame, and the other end is disposed on the first frame from the outer periphery of the second frame.
Since it is arranged to extend under the frame, automation of the processing of the coil terminal is facilitated.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing an assembling process of the speaker of FIG. 1;

FIG. 3 is a perspective view of a main part showing coil terminal processing of the speaker of FIG. 1;

FIG. 4 is a cross-sectional view showing a process of assembling the connection terminals of the speaker of FIG. 1;

FIG. 5 is a cross-sectional view showing a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st frame assembly 2 2nd frame assembly 11 1st frame 12 yoke 13 permanent magnet 14 top plate 21 2nd frame 22 lead frame 22a terminal 23 diaphragm 24 voice coil 24a coil terminal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshizumi Ota 1-23-1 Kagurechi, Fujiyoshida-shi, Yamanashi F-term in Citizen Electronics Co., Ltd. (Reference) 5D012 BC03 CA04 CA05 CA06 FA10 GA01 5D016 FA01 FA02 FA03 HA07

Claims (3)

[Claims] 1. A first frame assembly comprising a permanent magnet, a yoke fixed to one magnetic pole side of the permanent magnet, a top plate fixed to the other magnetic pole side, and a first frame having the yoke embedded therein. And a second frame assembly comprising a diaphragm, a voice coil fixed to the diaphragm, and a second frame to which the diaphragm is fixed, wherein the diaphragm is the first frame. A speaker fixed to a surface of the second frame facing the speaker. 2. A lead frame is buried in the second frame, one end of the lead frame is provided on an outer periphery of the first frame, and the other end is provided extending to a lower surface of the first frame. The speaker according to claim 1, wherein: 3. The speaker according to claim 2, wherein a coil terminal of the voice coil is joined to the one end of the lead frame disposed on an outer periphery of the first frame.