JPS5942793Y2 - speaker - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a speaker having a rectangular plane diaphragm to which a bobbin around which a voice coil is wound is joined.

In such a speaker, if the area of the diaphragm is the same,
They have many advantages, such as better directivity than round ones, and because the cabinets are generally square, the space factor is better.

By the way, when a plane diaphragm is vibrated, vibration modes are generated at various frequencies depending on the shape, size, and boundary conditions of the diaphragm.

At the frequency of the resonant mode, there are parts of the diaphragm that are displaced significantly and nodes that do not move at all.

In order to expand the piston motion of the speaker, it is sufficient to drive this node tL.

For example, in the case of a square, it is known that when the diaphragm is simply supported, it is sufficient to drive four points that are symmetrical about the center of the diaphragm and that are equally divided on each side.

For this reason, conventionally, a rectangular bobbin has been used so that the joint portion with the rectangular diaphragm is rectangular.

However, when the bobbin is rectangular as described above, it is difficult to manufacture a voice coil to be wound around the bobbin, resulting in poor workability and high cost.

This idea was made in view of the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a speaker that can improve workability without impairing the ideal drive of the rectangular plane diaphragm, and that can be made at low cost. It's about doing.

Below, the embodiments of this invention will be explained with reference to the drawings.
13 is a square planar diaphragm supported on the frame 12 by an edge 11; 13 is a bobbin joined to the back surface of the diaphragm 10; and a square joint 14 is joined to the diaphragm 10.
It consists of a round voice coil winding part 16 around which the voice coil 15 is wound, and a connecting part 17 that connects the two with a smooth curved surface.

In this connecting member 17, a portion 17a corresponding to the corner of the square joint portion 14 is rounded, so that the portion 17a is rounded.
Stress will no longer be concentrated on 7a.

18 is a damper, 19.2 (1) and 21 are a permanent magnet, a yoke, and a plate, respectively, which constitute a magnetic circuit for applying magnetic flux to the voice coil 15.

As mentioned above, this idea has a rectangular joint between the bobbin and the plane diaphragm, so it is possible to drive the ideal driving point of the rectangular plane diaphragm, and it is possible to drive a wide frequency band with piston motion at a high frequency of 1. Along with getting a speaker,
Since the voice coil winding part is round, the voice coil becomes round, which improves workability and reduces costs.Moreover, the voice coil becomes smaller, which reduces the size of the magnetic circuit, reducing costs. Many practical effects such as these can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and the first figure is a plan view and the second figure is a plan view.
The figure is a sectional view, and FIG. 3 is a perspective view. 10...Diaphragm, 13...Bobbin 1
4...Joint part, 15...Voice coil 16...Voice coil winding part.

Claims (1)

[Scope of utility model registration request] In a speaker having a rectangular planar diaphragm to which a bobbin on which a voice coil is wound is joined, the joining portion of the bobbin to the planar diaphragm is square, and the voice coil winding portion is round. A speaker characterized by: