JPH0851696A - Voice coil for speaker - Google Patents

Abstract

PURPOSE:To make the speaker thin and increase the sound quality by fixing the end part of a copper foil thread wire to a bobbin so that the copper foil thread wire has a specific lead-out angle at its hardened part. CONSTITUTION:The part L of the copper foil thread wire 3 which has necessary length from its bobbin-fixation side end part is hardened by being impregnated or coated with resin, and the end part of the copper foil thread wire 35 is fixed to the bobbin 13 while having the specific lead-out angle alpha at its hardened part 35. An adhesive which is flowable enough to enter the copper foil thread wire 35 and sets in a short time after entering the copper foil thread wire 35 is preferably used as the resin hardening the copper foil thread wire 35 nearby the bobbin-fixation side end part. The length L of the hardened part of the copper foil thread wire 35 is set according to the diameter, shape, etc., of the speaker. Further, the lead-out angle alpha of the hardened part 35a of the copper foil thread wire 35 is set according to the direction of the gap between the cone paper and damper so that it comes into contact with neither of the cone paper and damper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voice coil for a speaker.

[0002]

2. Description of the Related Art Voice coils are classified into indirect lead type and direct lead type. FIG. 2 shows a speaker using an indirect lead type voice coil, and FIG. 3 shows a speaker using a direct lead type voice coil. In the figure, 11 is a voice coil in which a coil 15 is wound around a cylindrical bobbin 13, 17 is a lead wire of the coil 15, 19 is cone paper, 21 is a frame, 23 is a center cap, 25 is a damper, 27 is a plate, 29 Is a magnet, 31 is a center pole yoke,
33 is an input terminal, 35 is an input terminal 33 and a lead wire 17 for the coil 15.
It is a copper foil thread wire with excellent flexibility for connecting with.

A speaker using an indirect lead type voice coil shown in FIG.
It is necessary to connect the copper foil thread 35 to the surface of the speaker, but the speaker using the direct lead type voice coil in FIG. 3 does not require it, and is easy to assemble.
There is an advantage that assembly can be easily automated.

4 and 5 each show a direct lead type voice coil. This type of voice coil 11
The coil 15 is wound around one end of the bobbin 13, and the lead wire 17 of the coil is connected to the end of the copper foil thread 35.
The end of 35 is fixed to the other end of the bobbin 13. The lead wire 17 and the copper foil yarn wire 35 are connected to each other by tying the lead wire 17 around the end of the copper foil yarn wire 35 and soldering it with the solder 37 as shown in FIG. The adhesive 39 fixes the end of the copper foil thread 35 to the bobbin 13.

[0005]

The speaker using the direct lead type voice coil shown in FIG. 3 has the above-mentioned advantages, but has the following drawbacks. That is, the copper foil thread 35 is inserted from the recessed portion between the cone paper 19 and the damper 25.
The space around the copper foil thread line 35 is narrow because the wire is pulled out. Besides, since the length of the copper foil thread line 35 becomes long,
The amplitude of the copper foil thread line 35 increases. As a result, copper foil wire 35
When the vibrates greatly and becomes like a jump rope, the trouble that the copper foil thread 35 comes into contact with the cone paper 19 and the damper 25 is likely to occur.

In order to eliminate this trouble, in the speaker using the direct lead type voice coil shown in FIG. 3, the gap between the cone paper 19 and the damper 25 is widened. However, widening the gap between the cone paper 19 and the damper 25 increases the thickness of the speaker, making it difficult to reduce the thickness and reducing the sound quality.

In view of the above-mentioned problems, an object of the present invention is to directly lead a copper foil thread wire without contact with the cone paper or the damper even if the gap between the cone paper and the damper is narrowed. To provide a type of voice coil.

[0008]

In order to achieve this object, the present invention is to wind a coil around the outer circumference of one end of a cylindrical bobbin, and connect the lead wire of the coil to the end of the copper foil thread wire.
In a voice coil for a speaker in which the end of the copper foil thread is fixed to the outer periphery of the other end of the bobbin, a portion of the copper foil thread extending from the end on the bobbin fixing side to a required length is impregnated with resin or It is characterized in that the end portion of the copper foil yarn wire is fixed to the bobbin in a state where the copper foil yarn wire is cured by application and the cured portion of the copper foil yarn wire has a predetermined drawing angle.

[0009]

By doing so, the hardened part of the copper foil thread will vibrate together with the bobbin while maintaining its posture, so that the amplitude of the copper foil thread will be changed in the recess between the cone paper and the damper. Can be made smaller. Therefore, even if the gap between the cone paper and the damper is narrower than in the conventional case, there is no possibility that the copper foil thread will contact the cone paper or the damper.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. In this voice coil 11, a coil 15 is wound around the outer circumference on one end side of a bobbin 13, and a lead wire 17 of the coil is connected to an end portion of a copper foil thread line 35 by soldering, and the end portion of the copper foil thread line 35 is connected. It is the same as the conventional one in that it is fixed to the outer peripheral surface on the other end side of the bobbin 13 with the adhesive 39.

The feature of this voice coil 11 is that the copper foil thread 35
From the bobbin fixed side end of, the portion L over the required length,
The point is that the end of the copper foil thread 35 is fixed to the bobbin 13 in a state in which the copper foil thread is cured by impregnation or application and the cured portion 35a of the copper foil thread has a predetermined drawing angle α.

The resin that hardens the vicinity of the end of the copper foil thread 35 on the bobbin fixing side has such a fluidity that it can enter the inside of the copper foil thread 35. It is preferable to use an adhesive (for example, an epoxy adhesive) that cures with time. Length of hardened part of copper foil thread L
Is set according to the diameter and shape of the speaker.
Further, the pull-out angle α of the cured portion 35a of the copper foil thread line is set to an angle that does not contact the cone paper and the damper, according to the direction of the gap between the cone paper and the damper.

The means for fixing the end of the copper foil thread wire to the bobbin is not the method using the adhesive as described above, but for example, the copper foil is adhered to the bobbin and the end of the copper foil thread wire is attached to the copper foil. It is also possible to adopt a method of soldering the parts.

[0014]

As described above, according to the present invention, in the direct lead type voice coil, the vicinity of the bobbin fixing side end of the copper foil thread wire is hardened, and the lead-out angle of the hardened portion is contacted with the surroundings. Because it is fixed so that it is difficult,
The amplitude of the copper foil thread line can be reduced in a deep space between the cone paper and the damper, and the copper foil thread line is less likely to come into contact with the cone paper or the damper. Therefore, the gap between the cone paper and the damper can be narrowed, the speaker can be made thin, and the sound quality can be improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a voice coil of the present invention,
(A) is a plan view and (B) is a front view.

FIG. 2 is a sectional view of a speaker using an indirect lead type voice coil.

FIG. 3 is a sectional view of a speaker using a direct lead type voice coil.

4A and 4B show an example of a conventional direct lead type voice coil; FIG. 4A is a plan view and FIG. 4B is a front view.

5A and 5B show another example of a conventional direct lead type voice coil. FIG. 5A is a plan view and FIG. 5B is a front view.

FIG. 6 is an explanatory view showing a connecting portion between a coil lead wire and a copper foil thread wire in a direct lead type voice coil.

[Explanation of symbols]

 11: Voice coil 13: Bobbin 15: Coil 17: Lead wire 35: Copper foil thread wire 35a: Cured part 39: Adhesive α: Lead angle

Claims (1)

[Claims] 1. A coil is wound around the outer periphery of one end of a cylindrical bobbin, and the lead wire of the coil is connected to the end of the copper foil thread wire.
In a voice coil for a speaker in which the end of the copper foil thread is fixed to the outer periphery of the other end of the bobbin, a portion of the copper foil thread extending from the end on the bobbin fixing side to a required length is impregnated with resin or A voice coil for a speaker, characterized in that the end portion of the copper foil thread wire is fixed to a bobbin while being cured by application, and the cured portion of the copper foil thread wire has a predetermined drawing angle.