JPH0453114Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a speaker using a plane diaphragm.

Background technology and its problems The first speaker using a conventional flat oscillating plate
Something like the one shown in the figure has been proposed.

In FIG. 1, 1 indicates a planar diaphragm composed of, for example, a honeycomb sandwich structure;
This plane diaphragm 1 is connected to the frame 3 via the edge 2.
is supported by A voice coil bobbin 4 is attached to the side opposite to the acoustic radiation surface of the flat diaphragm 1, and a voice coil 5 to which a voice current is supplied is provided around the free end of the voice coil bobbin 4.

Conventionally, this voice coil bobbin 4 was used as a flat diaphragm 1.
In order to obtain sufficient joint strength for attaching to
As shown in the figure, a voice coil ring 6 is used, and one side of the voice coil ring 6 is joined to the flat diaphragm 1, and the other side of the voice coil ring 6 is joined to the voice coil bobbin 4. In FIG. 1, 7 is a magnetic circuit provided in the frame 3 corresponding to the free end of the voice coil bobbin 4, and this magnetic circuit 7 consists of a yoke 7a having a center pole, a magnet 7b, a plate 7c, and a center pole. It consists of a pole and a magnetic gap formed between the plate 7c. 8 is voice coil bobbin 4 near voice coil 5 and frame 3
9 is an edge holder that clamps the outer periphery of the edge 2 together with the frame 3 and fixes the edge 2.

In a speaker using such a conventional flat diaphragm 1, a voice coil bobbin 4 is used as shown in FIG.
Since the voice coil ring 6 is used to join the diaphragm to the flat diaphragm 1, and the voice coil ring 6 is joined to the flat diaphragm 1 and the voice coil bobbin 4, the number of manufacturing steps increases accordingly. The weight of the voice coil ring 6 increases, which impairs the efficiency of the speaker and further deteriorates the sound quality.

Purpose of the invention In view of the above, an object of the present invention is to successfully join the plane diaphragm 1 and the voice coil bobbin 4 without using the voice coil ring 6.

Summary of the invention The present invention consists of a voice coil bobbin 4 having a voice coil 5 wound around one end thereof, an opening on one surface having approximately the same size as the diameter of the voice coil 4; The opening on the side of the surface is formed to have a larger diameter than the opening on one side,
A flat diaphragm 1 having a through hole 1a formed by connecting the peripheral edge of the opening on one surface and the peripheral edge of the opening on the other surface with a straight line, and the other end of the voice coil bobbin 4 in the through hole 1a. The outer surface of the voice coil bobbin 4 and the inner periphery of the through hole 1a are bonded together with an adhesive. According to the present invention, a voice coil ring can be used without using a voice coil ring. A flat diaphragm and a voice coil can be joined.

Embodiment An embodiment of the speaker of the present invention will be described below with reference to FIG. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this example, in order to join the plane diaphragm 1 made of, for example, a honeycomb sandwich structure and the voice coil bobbin 4, a through hole with approximately the same diameter as the voice coil bobbin 4 is provided in the center of the plane diaphragm 1. 1a, and in this example, the through hole 1a is shaped like a bowl, and the voice coil bobbin 4 is made to face up to a predetermined position of the through hole 1a of the flat diaphragm 1, and the outer peripheral part of the voice coil bobbin 4 and this An adhesive 10 is used to adhere the tapered portion of the inner peripheral portion of the through hole 1a.

In this example, a dustproof cap 11 having the same structure as the planar diaphragm 1, for example, a honeycomb sandwich structure, is then attached to the planar diaphragm 1 so as to close the through hole 1a of the planar diaphragm 1 from the sound radiation surface side.
It is provided in the through hole 1a of. The rest of the structure is the same as in FIG.

According to this example, in order to join the voice coil bobbin 4 and the flat diaphragm 1, all that is required is to bond the outer periphery of the voice coil bobbin 4 and the inner periphery of the through hole 1a of the flat diaphragm 1 with the adhesive 10. The number of bonding steps is reduced compared to the conventional method, which makes the structure easier. At this time, since the plane diaphragm 1 is provided with a through hole 1a, it is possible to observe the internal state through the through hole 1a. Since the work can be done through 1a, manufacturing becomes easier.
Furthermore, in this example, since the adhesive 10 is interposed between the outer circumferential portion of the voice coil bobbin 4 and the tapered portion of the inner circumferential portion of the through hole 1a, a sufficient bonding area can be secured and a sufficient amount of the adhesive 10 can be placed. It is possible to obtain sufficient adhesive strength. Also, in this example, since a voice coil ring or the like is not used to join the voice coil bobbin 4 and the flat diaphragm 1, the weight of the vibration system is reduced accordingly, and the efficiency of the speaker can be improved. The sound quality can be improved accordingly.

FIG. 3 shows another embodiment of the present invention. In FIG. 3, a downward taper is provided at the inner peripheral part of the through hole 1a in the example in FIG. 2, and this through hole 1a
An adhesive 10 is placed between the tapered inner circumferential portion of the voice coil bobbin 4 and the outer circumferential portion of the voice coil bobbin 4.
0 is hidden from view from the acoustic radiation surface side of the flat diaphragm 1. Further, 11a is a dustproof cap provided on the flat diaphragm 1 so as to close the through hole 1a of the flat diaphragm 1 from the sound radiation surface side. The rest of the structure is the same as that shown in FIG.

It is easy to understand that the same effect as in FIG. 2 can be obtained in the example shown in FIG. 3 as well.

In the above embodiment, a honeycomb sandwich structure was used as the planar diaphragm 1, but similar effects can be obtained even if other materials such as styrene foam are used as the planar diaphragm 1. Of course. Furthermore, it goes without saying that the present invention is not limited to the above-described embodiments, and that various other configurations can be adopted without departing from the gist of the present invention.

Effects of the invention According to the invention, the flat diaphragm and the voice coil can be bonded well without using a voice coil ring, the number of parts can be reduced, and the manufacturing process is reduced accordingly, making manufacturing easier. Become. Furthermore, since the present invention does not use a voice coil ring, the weight of the vibration system is reduced accordingly, which improves the efficiency of the speaker and improves the acoustics accordingly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional speaker, and FIG. 2 is a sectional view showing an embodiment of the speaker of the present invention.
FIG. 3 is a sectional view showing another embodiment of the present invention. 1 is a flat diaphragm, 1a is a through hole, 2 is an edge,
3 is a frame, 4 is a voice coil bobbin, 5 is a voice coil, and 7 is a magnetic circuit.

Claims (1)

[Claims for Utility Model Registration] A voice coil bobbin with a voice coil wound around one end, an opening on one surface having approximately the same size as the diameter of the voice coil, and A through-hole formed by forming the opening on one side to have a larger diameter than the other opening, and connecting the periphery of the opening on one side with the periphery of the opening on the other side with a straight line. the other end of the voice coil bobbin is inserted into the through hole, and the outer surface of the voice coil bobbin and the inner periphery of the through hole are joined by an adhesive portion. Featured speakers.