JPH0432866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a speaker, and particularly to a structure of a speaker suitably used as a thin speaker.

[Prior Art] As shown in FIG. 4 or FIG. 5, conventional cone-shaped speakers each have a voice coil 1 joined to a small diameter portion of a conical paper cone 2, and a cone-shaped speaker. It has a structure in which the large diameter part of the paper 2 is joined to the speaker edge 3. In addition, the fourth
The speaker shown in the figure is equipped with a center cap 4, and the speaker shown in FIG. 5 is equipped with a subcone 5 that also serves as the center cap. and works to improve acoustic characteristics.

[Problem to be solved by the invention] As mentioned above, simply one conical paper cone 2
In a conventional cone-shaped speaker, when trying to make it thin, the conical shape of the cone paper 2 inevitably becomes flattened, and the half apex angle θ of the top of the cone paper 2
That is, the angle between the direction of the axis of the voice coil 1 (indicated by C in the figure) and the paper cone 2 becomes larger. Such shape effects cause various drawbacks as described below. That is, () the dip in the frequency characteristic that occurs in the midrange range where the paper cone 2 and the edge 3 vibrate in opposite phases, that is, the valley in the midrange becomes larger.

() Since the half apex angle θ of the paper cone 2 becomes large, the high frequency range is no longer produced.

() Due to its shape, the diaphragm tends to generate abnormal noise.

In addition, in order to eliminate such drawbacks, as shown in FIG. 6, a lightweight and highly rigid honeycomb plate 6 is provided at the joint between the cone paper 2 and the speaker edge 3 to cause both to vibrate integrally. However, since this uses an expensive honeycomb plate 6, the manufacturing cost is high.

This idea was proposed in view of the above circumstances.
The object is to provide a low-cost thin speaker with good frequency characteristics.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, the paper cone provided between the voice coil and the speaker edge is attached to the inner side of the small diameter portion where the small diameter portion is joined to the voice coil. It is composed of a cone and a large-diameter outer cone whose large diameter portion is joined to the speaker edge, and a peripheral edge of a disk-shaped plane diaphragm is joined to the intermediate part between the inner cone and the outer cone. .

[Function] The planar diaphragm is driven by the inner cone to vibrate, and sound pressure is generated by the vibration of the planar diaphragm and the vibration of the outer cone.

Since the diameter of the inner cone is small, even if the diaphragm is made thin as a whole, the half apex angle of the cone can be made small, and high frequency range can be produced well. The treble range is mainly produced by the flat diaphragm.

In addition, due to its shape, there is little generation of abnormal noise from the flat diaphragm or paper cone.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In addition, the same reference numerals are attached to the parts common to each of the conventional examples shown in FIGS. 4 to 6 in the drawings to simplify the explanation.

FIG. 1 shows a first embodiment of the present invention.

This diaphragm is constructed by cone paper 2 in two stages, an inner cone 10 and an outer cone 1.
1 and an annular flat part 12 that serves as a connection between them.
It is composed of. The inner cone 10 is
The outer cone 11 has a taper that gradually becomes larger in diameter while protruding forward (upward in the figure) from the small diameter side formed to have approximately the same diameter as the voice coil 1. 1
It has a taper that gradually becomes larger by folding back (downward in the figure) from the small diameter side that is set to the same diameter as the largest diameter part of 0, and the large diameter part (outer peripheral part ) is connected to speaker edge 3.

A flat diaphragm 13 is bonded to the flat portion 12 . The bonded portion is a vibration node of the flat diaphragm 13. This planar diaphragm 13 is made of a highly rigid and lightweight material such as a honeycomb plate or mica foam, and is mounted in a direction perpendicular to the axis of the voice coil 1 and driven through the inner cone 10. It is becoming more and more common. Since the large diameter portion of the inner cone 10 has a sufficiently smaller diameter than the speaker edge 3, the half apex angle θ can be made sufficiently smaller than that of a conventional cone-type speaker.

In the cone-shaped speaker configured as described above, the inner cone 10 is driven by the voice coil 1 to vibrate, and the plane diaphragm 13 is driven by the inner cone 10 to vibrate. Sound pressure is generated by the vibration of the plane diaphragm and the vibration of the outer cone. This plane diaphragm 13 is mainly involved in the high-pitched range, but since the diameter of the inner cone 10 is small, the half-vertex angle θ can be made sufficiently small even if it is made thin, and therefore the high-pitched range can be produced well. .

Moreover, the rigidity of the diaphragm as a whole is high in terms of shape, and the occurrence of abnormal noise from the inner cone 10, outer cone 11, and plane diaphragm 13 is small.

Further, in the case of a cone-shaped diaphragm, the flat diaphragm 13 does not have the concave effect caused by its shape, that is, the disturbance of the sound pressure characteristics due to the above-mentioned effect, so that the frequency characteristics are flat even in the high frequency range.

FIG. 2 shows a second embodiment of the present invention, in which an outer cone 11A is provided on the outside of the inner cone 10 with the same inclination direction as the inner cone 10 without being folded back in the opposite direction. Even with this structure, the half apex angle θ can be made sufficiently small as in the case of the first embodiment, and the plane diaphragm 13 can be driven by the inner cone 10 to obtain good frequency characteristics. .

Furthermore, FIG. 3 shows a third embodiment of the present invention, in which the bobbin 1a of the voice coil 1 in the first embodiment is extended forward, and both the bobbin 1a and the flat portion 12 are subjected to planar vibration. It is designed to be adhered to the plate 13. This bobbin 1a is also bonded to the vibration nodes of the flat diaphragm 13. When such a structure is adopted, the plane diaphragm 13 is more firmly bonded to the voice coil 1, and the plane diaphragm 13 is
It is directly driven by the voice coil 1 and integrally driven in the direction of the axis C, further improving frequency characteristics.

It should be noted that the material of the plane diaphragm is not limited to those used in each of the above-described embodiments, and it is of course possible to use other materials that are lightweight and have high rigidity. By selecting the material used for the flat diaphragm, the sound quality of the speaker can be changed to create a sound that suits the purpose.

[Effects of the invention] As is clear from the above description, the present invention provides a cone paper provided between a voice coil and a speaker edge, a small diameter inner cone whose small diameter portion is joined to the voice coil, and a small diameter inner cone whose small diameter portion is joined to the voice coil. It consists of a large-diameter outer cone whose large-diameter part is joined to the speaker edge, and the peripheral edge of a disk-shaped plane diaphragm is joined to the intermediate part between these inner cones and outer cones, so even if the cone is made thin. It has become possible to reduce the half-vertex angle of the paper, and it has become possible to obtain a full-range speaker at low cost that has no dip in the midrange and has good characteristics in the treble range.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the first embodiment of the present invention with the right half omitted, Figure 2 is a cross-sectional view of the second embodiment of the present invention with the right half omitted, and Figure 3 is the third embodiment of the present invention. 4 is a sectional view of the first conventional example with the right half omitted, FIG. 5 is a sectional view of the second conventional example with the right half omitted, and FIG. 6 is a sectional view of the third conventional example with the right half omitted. FIG. 3 is a cross-sectional view of a conventional example with the right half omitted. 1...Voice coil, 2...Cone paper, 10...
...Inner cone, 11, 11A...Outer cone, 1
2... Flat part, 13... Plane diaphragm.

Claims (1)

[Scope of utility model registration request] A cone paper provided between the voice coil and the speaker edge is composed of a small diameter inner cone having a small diameter portion joined to the voice coil, and a large diameter outer cone having a large diameter portion joined to the speaker edge. A speaker characterized in that a peripheral edge of a disk-shaped plane diaphragm is joined to an intermediate portion between the inner cone and the outer cone.