JP2001169389A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of a conventional speaker where many man-hours have been required to adhere a voice coil to a diaphragm and there has been fluctuation at an adhered position resulting in causing instability in the characteristics. SOLUTION: A yoke 2 is fixed to a frame 1, one magnetic pole of a permanent magnet 3 is fixed to the yoke 2, a top plate 4 is fixed to the other magnetic pole of the permanent magnet 3, and a circumferential part 5b of the diaphragm 5 is fixed to the frame 1. An air-core voice coil 16 is inserted to a gap between the yoke 2 and the top plate 4 and an upper end face is adhered and fixed with the diaphragm 5 and a flat part 5a. A projection 5c for coil positioning is provided adjacent to the flat part 5a of the diaphragm 5 through integral molding of a plastic material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an electrodynamic speaker,
More specifically, the present invention relates to a bonding structure between a voice coil and a diaphragm.

[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. 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. FIG. 5 shows a longitudinal section at the center of the speaker, and the symmetrical right half is omitted. Reference numeral 1 denotes an annular frame having an inner peripheral step 1a and an intermediate step 1b. 2
Is a dish-shaped yoke made of a magnetic material fixed to the inner peripheral step 1a. Reference numeral 3 denotes a disk-shaped permanent magnet fixed to the center of the bottom surface of the yoke 2 and having magnetic poles above and below. Reference numeral 4 denotes a disk-shaped top plate fixed to the other magnetic pole side surface of the permanent magnet 3. A magnetic circuit is formed by the permanent magnet 3 through a gap between the upper end of the yoke 2 and the peripheral edge of the top plate 4.

Reference numeral 15 denotes a substantially spherical diaphragm integrally formed of a plastic material having a flat portion 15a near the periphery and a curved portion following the flat portion 15a. It is adhesively fixed to the step 1b. 1
Reference numeral 6 denotes a voice coil which is an annular air-core coil in which coil windings, which are enamel-coated copper wires, are arranged in a rectangular cross section and solidified with paint, and the upper surface thereof has a flat portion 1 of the diaphragm 15.
5a is adhesively fixed to the lower surface. The voice coil 16 is fitted into a gap between the peripheral edge of the top plate 4 and the upper end of the yoke 2 to a depth of approximately half the coil length.

Next, a method of assembling the speaker will be described. First, the surface on one magnetic pole side of the permanent magnet 3 is bonded to the center of the yoke 2, and then the top plate 4 is bonded and fixed with its center positioned on the surface on the other magnetic pole side of the permanent magnet 3. On the other hand, the voice coil 1 is placed on the flat portion 15a of the diaphragm 15.
6 is centered and adhered. Next, the yoke 2 is attached to the inner peripheral step 1a of the frame 1, and finally the diaphragm 15 to which the voice coil 16 is adhered is attached to the intermediate step 1b to complete the process. When an audio signal is input to the voice coil 16 of the speaker, the diaphragm 15 is driven according to Fleming's left hand rule.
Vibrates up and down and emits sound.

[0006]

However, in the above-described speaker, in the step of bonding the voice coil 16 to the diaphragm 15, it is necessary to first apply an appropriate amount of adhesive to the flat portion 15a of the diaphragm 15. At this time, the nozzle of the dispenser containing the adhesive is operated so as to draw an arc trajectory on a plane. In this operation, it is difficult to maintain a coating position so as not to deviate from an accurate trajectory. Therefore, it is difficult to keep the amount of the adhesive applied along the track constant. Further, when aligning the center positions of the diaphragm 15 and the voice coil 16, planes having no positioning guide are abutted against each other, so that accurate positioning is difficult.
From the above, there has been a problem that a large number of steps are required for the bonding operation and that the voice coil bonding position has a large variation in accuracy, resulting in a lack of stability due to variation in the characteristic surface, leading to an increase in the cost of the speaker. Further, since the air-core voice coil 16 is used, the aligned coil winding may be broken during handling.

The above-mentioned invention has been made to solve such a conventional problem, and an object of the invention is to improve the accuracy of the coil bonding position, facilitate the management of the adhesive application position, and provide An object of the present invention is to provide a speaker that does not require cost by reducing man-hours for bonding to a voice coil, preventing winding collapse of the voice coil, and stabilizing quality by improving the accuracy of voice coil bonding position. .

[0008]

In order to solve the above-mentioned problems, the present invention provides a permanent magnet, a yoke fixed to one magnetic pole side of the permanent magnet, and a top plate fixed to the other magnetic pole side. In a dynamic conductive speaker including a frame to which the yoke is fixed, a diaphragm fixed to the frame, and a voice coil fixed to the diaphragm, a protrusion for coil positioning is provided on the diaphragm. And

According to a second aspect of the present invention, in the first aspect, the protrusion is formed integrally with the diaphragm.

According to a third aspect of the present invention, in the first aspect, the voice coil is formed by winding a coil winding around a bobbin, and the bobbin is bonded and fixed to the diaphragm. Features.

According to a fourth aspect of the present invention, in the third aspect, the bobbin has an inverted L-shaped cross section.

According to a fifth aspect of the present invention, in the third aspect of the present invention, the protrusion is engaged with an inner peripheral side of the bobbin.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of a speaker according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a method of applying an adhesive in the first embodiment, FIG. 3 is a sectional view of a main part of the speaker according to the second embodiment, and FIG. 4 is a speaker according to the third embodiment. It is principal part sectional drawing of.

First, the configuration of an electrodynamic loudspeaker according to a first embodiment of the present invention will be described. In FIG. 1, reference numeral 5 denotes a vibrating plate formed by integral molding of a plastic material. The vibrating plate 5 has a projection 5c for coil positioning formed on the inner peripheral side of a flat portion 5a. different. Other configurations are the same as those of the related art, and thus the same reference numerals and names are assigned to the respective constituent elements, and the description is omitted. Projection 5c
May be an annular projection continuous on the circumference or a discontinuous projection.

Next, assembling of the speaker according to the present embodiment will be described with reference to FIG. In FIG. 2, reference numeral 11 denotes an adhesive, and 12 denotes a dispenser nozzle for applying the adhesive 11. The diaphragm 5 has its lower surface facing upward. In the bonding step between the voice coil 16 and the diaphragm 5, first, the adhesive 11 is applied to the flat portion 5a of the diaphragm 5. At that time,
As shown in FIG. 2, the dispenser nozzle 12 is
It can be operated along the corner where a and the projection 5c are in contact. When the voice coil 16 is bonded, the outer periphery of the protrusion 5c guides the upper end of the inner periphery of the voice coil 16 so that the center position is naturally determined. Other steps are the same as those of the conventional speaker.

Next, effects of the present embodiment will be described. Protrusion 5c for positioning voice coil 16 on diaphragm 5
Is provided, the dispenser nozzle can be operated easily and smoothly, and the application position and the application amount can be easily managed. Further, mutual positioning of the diaphragm 5 and the voice coil 16 is facilitated. This leads to a reduction in the number of bonding steps. Also, the position accuracy of the voice coil is improved,
Stabilizes in characteristics.

Next, the configuration of a speaker according to a second embodiment of the present invention will be described. In FIG. 3, reference numeral 6 denotes a voice coil, 7 denotes a coil winding constituting the voice coil 6, and 8 denotes a cylindrical bobbin having an I-shaped cross section. A coil winding is wound around the bobbin 8. The bobbin 8 is positioned such that the upper end of the inner circumference abuts on the outer base of the protrusion 5c of the diaphragm 5, and the upper surface is adhesively fixed to the flat portion 5a. Other configurations are the same as those of the first embodiment, and the same reference numerals and names are assigned to the respective components, and the description will be omitted. In this embodiment, in addition to the same effects as those of the first embodiment, since the bobbin 8 is used for the voice coil 6, there is an effect that the coil winding 7 that is aligned and wound is less likely to collapse.

Next, the configuration of a speaker according to a third embodiment of the present invention will be described. In FIG. 4, reference numeral 9 denotes a voice coil, and reference numeral 10 denotes a bobbin whose voice coil 9 has an inverted L-shaped cross section. The other configuration is the same as that of the second embodiment, and the same reference numerals and names are assigned to the respective components, and the description is omitted. Since the bobbin 10 has an inverted L-shaped cross section,
A relatively large bonding area with the diaphragm 5 can be obtained, which contributes to an increase in fixing force.

[0019]

As described above, according to the present invention,
Since the projection for positioning the voice coil is formed on the diaphragm, the application of the adhesive is facilitated, the application position and the application amount are easily managed, and the man-hour for bonding the voice coil can be reduced.

Further, since the coil winding is wound around the bobbin, the winding collapse of the voice coil can be prevented. Also, by improving the accuracy of the voice coil bonding position,
Stabilizes quality and characteristics.

[Brief description of the drawings]

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

FIG. 2 is a perspective view showing a method of applying an adhesive.

FIG. 3 is a sectional view of a main part of a speaker according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a speaker according to a third embodiment of the present invention.

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

[Explanation of symbols]

 Reference Signs List 1 frame 2 yoke 3 permanent magnet 4 top plate 5 diaphragm 5c protrusion 6, 9, 16 voice coil 7 coil winding 8, 10 bobbin 11 adhesive

Claims (5)

[Claims] 1. 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, a frame fixed to the yoke, and a diaphragm fixed to the frame. And a voice coil fixed to the diaphragm, wherein the diaphragm is provided with a projection for coil positioning. 2. The speaker according to claim 1, wherein the projection is formed integrally with the diaphragm. 3. The speaker according to claim 1, wherein the voice coil is formed by winding a coil winding around a bobbin, and the bobbin is adhered and fixed to the diaphragm. 4. The speaker according to claim 3, wherein the bobbin has an inverted L-shaped cross section. 5. The loudspeaker according to claim 3, wherein the projection is engaged with an inner peripheral side of the bobbin.