JPS5863294A - Speaker diaphragm - Google Patents

Abstract

PURPOSE:To eliminate the resonance at a high band and to reduce the weight of a diaphragm, by giving a cut to a flat plate on the rear side of a diaphragm, raising the cut to use it as a fin and adhering a surface flat plate to the edge of the fin. CONSTITUTION:A plane diaphragm has a laminated structure in which a core is held between a surface material 1 and a rear side material 2. A cut is given to the material 2 and then raised up to be used as a fin 5. This fin 5 is used as a core material, and the edge of the fin 5 is adhered to the material 1. A hole is produced at the laminated area to avoid the resonance due to the sealing. Furthemore the use of another core material is eliminated to reduce the weight of a diaphragm. In addition, the fins 5 are set radially at the center of the diaphragm to decrease the rolling of the diaphragm.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker diaphragm constructed by inserting a core material between a front surface material and a back surface material.

FIG. 1 shows a conventional speaker diaphragm of this type.

There was something like the one shown in Figure 2. Figure 1 shows surface material +1
A plan view with part of 1 removed, Figure 2 is the ■-■ of Figure 1.
In the enlarged cross-sectional view, (2) is the back material, (31 is the core material formed in a honeycomb shape, and adhesive (4) is applied to both sides of the core material (31) or to one side of the surface material (11 and back material (2)). ) Wotsuke 1 It was constructed by adhering the surface material (1), the back material (2), and the core material (3).

The conventional diaphragm as described above has the following two drawbacks. The first drawback is that when the frequency of driving the diaphragm becomes high, the front and back materials 111 surrounded by each regular hexagonal cell forming the core material (3). +21
As shown in Figure 4, when the minute portion of . Here, FIG. 3 is a plan view of one regular hexagonal cell.

Figure 4 is the rV-IV sectional view of the front and back materials fil,
Is +21 a vibration with the imaging width distribution shown in the solid line? I come to do it. When such vibration occurs, the high-frequency reproduction frequency band of the speaker is limited, and it also causes distortion, which ultimately leads to deterioration of sound quality.

The second drawback is that there is a limit to the weight reduction because it is composed of 9 front and back materials fil, (2+), core material (3), and adhesive (4).

This invention was made to eliminate the drawbacks of the conventional products as described above, and by making a cut T in the back material and cutting and raising this cut portion to form a core phase, it is possible to create a cell with a regular hexagonal shape like the conventional one. Sealed space 1ij with front and back materials
l is gone.

In addition to reducing high-frequency resonance of the front and back materials.

We have developed a speaker diaphragm that can reduce the weight of the imaging plate itself, and can also reduce rolling of the imaging plate by having multiple cut-and-raised parts extending radially from the center of the diaphragm. This is the book we offer.

The present invention will be described in detail below with reference to illustrated embodiments. Fifth
The figure and FIG. 6 are a plan view and a bottom view of the diaphragm, and FIG. 7 is an enlarged sectional view taken along the line ■-■ of FIG. 5.

Figure @8 is a perspective view of the stage before bonding the front material +11 and the back material (2). In these figures, (51 is a back material (2) with a plurality of cuts radially extending from its center;
Five phases (31) are formed by fins formed by vertically bending the cut portions.

The height of the fins (51) is constant in the length direction, and when the 9 surface material (1) and the back surface material (2) are bonded together via rough-in +51 to form a diaphragm, the surface material (11 and the back surface material Material (2) becomes parallel.

The fins (51) are arranged radially from the center of the diaphragm, so the radial strength of the diaphragm can be maintained.
If the fins (51) are arranged closely, the front and back sides will be uneven, which was the first drawback of conventional diaphragms.

(The resonance of 21 can be moved to a higher frequency band.

In addition, 3 materials (: back side 4 /
I'i It is composed of cut and raised fins (51), and this fin (51 only needs to be glued to the surface material (11), so it only needs to be on one side, which improves the second drawback of the conventional one and reduces weight. Figure 1.

Other embodiments of the present invention are shown in FIGS. 9 to 12. 9th
The figure and Figure 1O show a top view and a bottom view of the same diaphragm. In other words, two types of long fins are provided alternately.Furthermore, shorter fins may be provided between each of these fins (51).

Figures 11 and 12 show another embodiment, showing a top view and a bottom view of the same diaphragm.

The fins (51) provided in the surface material Q21K are provided so as to be divided into eight equal parts in the radial direction, and a large number of fins are provided in parallel to one of the divided fins in the divided parts.

Also taken 4 + + + front and back materials of the board! 11. The structure Fi of the outer peripheral end of +21 may be any of the structures shown in FIGS. 13 to 15. In other words, Figure 'lA13 shows the surface material (11
and back material (2) with the same diameter and terminated, Figure 14 shows front and back material III, and +21 with outer peripheral ends bent inward (however, either one may be used). Figure 15 shows how the outer peripheral end of the backing material (2) is connected to the fin (5).
) and bent inward and glued to the outer periphery of the surface @ (11) (this is also a surface material (11 may be extended and bent).

Although the above embodiment has been described with reference to a circular photographic plate, it goes without saying that the plate is not limited to a circular shape, and the material of the backing material (2) on which the fins (5) are provided is made entirely of metal foil. This is simple, but molded products such as plastics may also be used.

Further, by partially or entirely filling a foam material or a sound absorbing material between the front and back surface materials fil and +21, resonance in the high range of the photographing plate itself can be damped.

Further, as a method of driving the photographing plate according to the present invention, the reproduction band as a speaker can be expanded by driving the nodes of the divided vibration mode in the same manner as the conventional photographing plate.

As described above, according to the present invention, cut-and-raised fins are provided on the back surface material and are bonded to the first surface material, thereby reducing the effects of resonance in the high range of the front and back materials, and further reducing weight. There are effects that can be achieved.

[Brief explanation of drawings]

Figure 1 is a front view showing a conventional photographic board, Figure 2, 4, and 1.
Figure 3 is a front view showing all six materials of a conventional imaging plate, and Figure 4 is an IV-IV cross-sectional view of Figure 3 when the diaphragm vibrates in the high range. , $5 and FIG. 6 are front and back views of the same diaphragm showing one embodiment of the present invention, FIG. 7 is an enlarged view showing the cross section of FIG. FIG. 6, a perspective view showing a stage before bonding the front surface material and back surface material of the diaphragm of the present invention shown in FIG. 6, FIG. 9, FIG. 1θ, FIG. 11, and FIG. FIGS. 13 to 15 show a front view and a back view of a vibration plate showing an embodiment of the present invention, and sectional structural views of the outer peripheral end of the diaphragm of the present invention. Mountain...Surface material, (21...Back material, (31...5)
Drama, (4)...Adhesive, (5)...Fin agent Shin Kuzuno - ・, (. WF, 1 Figure 2! Leather 5rl! J City 6 Figure j゛Figure 8rl! J @ Figure 10 Figure 12 -4゜

Claims (1)

[Scope of Claims] (11) A core material consisting of a plurality of thin plates placed at intervals between each other is inserted between the surface material and the back material, and the surface material, the stone material, and the back material are bonded to each other. In the speaker diaphragm, a notch is provided in the surface material, and the notch is cut and raised to form a fin, and the fin has a plurality of fins extending radially from the center of the imaging plate. A diaphragm for a speaker, characterized in that it is bonded to a surface material to serve as a core material. Plate. (3) A light leakage material or a sound-absorbing material is inserted between the surface material and the back surface material, and together with the fins, the fins are formed into a 6-piece shape. A diaphragm for a speaker according to claim 3. (4) A diaphragm for a speaker according to claim 3, characterized in that cut and raised fins are provided on the front material, and the back side is a flat plate.