JPH0749906Y2 - Speaker diaphragm structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a diaphragm structure for a dome-type speaker, and more particularly to a diaphragm structure having improved characteristics by providing strength to the outer peripheral portion of the diaphragm. is there.

[Prior Art] Conventionally, a dome-shaped diaphragm is often used for high-pitched and mid-tone speakers, and its structure is as shown in FIGS. 5 and 6 (A) and (B). Is common.

The diaphragm structure shown in FIG. 5 is a dome-shaped diaphragm 11
The voice coil bobbin 12 and the outer peripheral edge 13 of the diaphragm are formed by separate members, and these are adhered to each other at the adhering portion 14. In FIG. 6A and FIG. As proposed, the dome-shaped diaphragm portion 11, the voice coil bobbin portion 12, and the edge portion 13 formed at the lower end edge thereof.
Are integrally molded, and the edge portion 13 is sandwiched by the sandwiching member 15 disposed inside the magnetic circuit. In the figure, 16 is a voice coil, 17 is a yoke, 18 is a magnet, 19 is a top plate, and 20 is a frame.

[Problems to be solved by the invention] However, in the case of FIG. 5, the voice coil bobbin 12
Since the upper end of the speaker and the back surface of the diaphragm 11 are line-bonded, there is a drawback that the bonding area is small, which easily causes instability, and a large resonance peak is generated in the high-frequency part characteristics of the speaker.

6 (A) and 6 (B) have the advantages that they are stable because they do not have an adhesive portion and that the wiring process can be simplified, etc. There were some points to be improved, such as the possibility of sharp occurrence.

An object of the present invention is to solve the above-mentioned drawbacks of the conventional diaphragm structure and to provide a diaphragm structure capable of controlling and flattening the peak of high-frequency resonance in the high-pitched part of the speaker.

[Means for Solving the Problems] In order to achieve the above object, in the present invention, a dome-shaped diaphragm portion, a coil bobbin portion, and an edge portion formed at a lower end edge thereof are integrally molded to form an integral type vibration. A plate member is formed, and a central part of the vibration plate portion of the vibration plate member is cut off to form a perforated vibration plate member, and a vibration plate center member having a larger diameter than the separately formed hole is defined as an outer peripheral portion thereof. The perforated vibrating member is arranged and adhered so as to be overlapped with the rim of the perforation of the perforated vibrating member, whereby the outer peripheral portion of the diaphragm is formed into a superposed structure, and the outer peripheral portion of the diaphragm has a thickness.

In this case, the hole of the perforated diaphragm member and the diaphragm center member may have a perfect circular shape, but the effect is further improved by forming the shape into an elliptical shape, a triangular shape, a polygonal shape, or any other shape other than a perfect circular shape. Can be increased.

Further, by forming the perforated diaphragm member and the diaphragm central member joined to the perforated diaphragm member from different materials, the natural resonance can be reduced, or the perforated diaphragm member and the vibration can be reduced. By forming an elastic layer at the joint with the plate center member, it is possible to further reduce high frequency resonance due to internal loss of the elastic material.

[Operation] A dome-shaped diaphragm obtained by joining a perforated diaphragm member and a diaphragm central member has a voice coil formed in the coil bobbin portion, and is shown in FIG. 6 (A) previously proposed by us. Means, that is, the edge portion is incorporated in the magnetic circuit in a form of being sandwiched by the sandwiching member.

The diaphragm having the above structure is stable because the outer peripheral portion of the dome diaphragm portion has a superposed structure and the joint portion is surface-bonded. Further, since the thickness is formed on the outer peripheral portion of the diaphragm, the peak in the high frequency range is flattened, as is clear from the frequency characteristic diagram described later.

When joining the diaphragm center member, if an elastic layer is formed at the joint by adhering with an adhesive mixed with an elastic material, the peak of resonance in the high frequency range will be further reduced due to internal loss of the elastic material, and will be further flattened. .

When the perforated diaphragm member and the diaphragm center member are formed of different materials, the natural resonance is reduced.

[Embodiment] An embodiment of the diaphragm structure of the speaker of the present invention will be described with reference to FIGS. 1 to 4.

In the diaphragm structure of the present invention, the dome-shaped diaphragm portion 6, the coil bobbin portion 2 and the edge portion 3 formed at the lower end edge thereof are integrally molded to form the diaphragm member X and the diaphragm portion 6 is formed. By cutting the center portion with the cutting line 7, a perforated diaphragm member 10 is formed, and by joining the separately formed diaphragm central member 1 having a larger diameter than the above-mentioned hole at the joint portion 4, the outer peripheral portion of the diaphragm is superposed. It is formed into a structure and has a thickness.

A voice coil 5 is formed on the coil bobbin portion 2 of the dome-shaped diaphragm configured as described above, and as shown in FIG. 6 (A), the edge portion 3 is sandwiched by the sandwiching member 15 to form a magnetic circuit. Incorporated.

Next, a specific example of forming the diaphragm will be described.

Example 1 As shown in FIG. 1 (A), a dome-shaped vibrating plate portion 6, a coil bobbin portion 2 and an edge portion 3 formed on the lower end edge thereof are integrally molded to form a titanium plate having a thickness of 25 microns. A body type diaphragm member X is obtained, and a perforated diaphragm member 10 whose central portion is cut off is formed by cutting the vibrating plate portion 6 near the outer peripheral portion in a circular shape along a cutting line 7, and FIG. As shown in B), the diaphragm center member 1 made of an inorganic material having a spherical radius of 19 mm and a thickness of 40 μm was separately molded.

The diaphragm central member 1 was arranged so that the outer peripheral portion thereof and the rim of the hole of the perforated vibrating member 10 were overlapped with each other and bonded at the joint portion 4 with an acrylic adhesive.

Example 2 A rubber-based adhesive containing neoprene rubber as a main component, which is softer and more elastic than an acrylic-based adhesive, was used as the adhesive in the joint portion 4, and the others were the same as in Example 1.

Example 3 As the diaphragm central member 1, a dome type diaphragm made of a soft material called a soft dome, which is made by applying a braking material to a nylon cloth, was used, and the others were the same as in Example 1.

As another configuration example, the holes of the perforated diaphragm member 10 and the diaphragm center member 1 are, for example, shown in FIGS. 3 (A), (B),
The effect can be further enhanced by forming an elliptical shape, a triangular shape, a polygonal shape, or any other shape other than a perfect circle as in (C).

FIG. 4 (A) is a comparative frequency characteristic diagram comparing the frequency characteristic A of the dome-type speaker incorporating the diaphragm according to the first embodiment with the frequency characteristic D of the conventional one of FIG. 6 (A), The input was 2.45V, 1W, and the microphone distance was 100cm. As is clear from this characteristic diagram, in the case of the present invention, the outer peripheral portion of the diaphragm has a thickness, the peak of resonance in the high frequency range disappears and the surface is flattened, and it is proved that it is remarkably improved.

FIG. 4 (B) is a frequency characteristic B of the speaker using the diaphragm according to the second embodiment and a frequency characteristic C of the speaker according to the third embodiment.
In Example 2, the elastic layer is formed of an elastic adhesive, and the internal loss of the elastic material reduces the peak of resonance in the high frequency range to flatten the surface. In No. 3, since the natural resonance disappears, the peak also disappears.

[Effects of the Invention] The speaker diaphragm structure of the present invention has the following effects.

The peak of the high range of the speaker can be controlled and flattened.

By forming the elastic layer at the joint between the diaphragm central member and the perforated vibration member, the resonance peak in the high frequency range can be reduced by the internal loss of the elastic material.

By using different materials for the perforated diaphragm member and the diaphragm center member, the natural resonance can be reduced, and the peak of the high frequency resonance can be flattened.

It is possible to eliminate high frequency distortion caused by the peak in the high range.

[Brief description of drawings]

1 to 4 show an embodiment of a diaphragm structure of a speaker according to the present invention, and FIGS. 1 (A) and 1 (B) are sectional views of a perforated diaphragm member and a diaphragm center member, and FIG. FIG. 2A is a cross-sectional view showing the diaphragm structure, FIG. 2B is a plan view of the same as above, FIG. 3 is a plan view showing another configuration example, and FIGS. 4A and 4B are frequency characteristic diagrams. Is. 5 and 6 (A) and (B) are sectional views showing an example of a diaphragm structure of a conventional speaker. 1: Diaphragm center member, 10: Perforated diaphragm member, 2: Coil bobbin part 3: Edge part, 4: Join part, 5: Voice coil

Claims (4)

[Scope of utility model registration request] 1. A dome-shaped diaphragm portion, a coil bobbin portion, and an edge portion formed at a lower end edge thereof are integrally molded to form an integral diaphragm member, and a central portion of the diaphragm portion is cut off. As a result, a perforated diaphragm member is formed, and a diaphragm central member having a larger diameter than the separately formed hole is joined to form an outer peripheral portion of the diaphragm in a superposed structure to have a thickness. Speaker diaphragm structure. 2. The speaker diaphragm structure according to claim 1, wherein the holes of the perforated diaphragm member and the diaphragm center member have an elliptical shape, a triangular shape, a polygonal shape or any other shape other than a perfect circle. . 3. The diaphragm structure for a speaker according to claim 1, wherein the perforated diaphragm member and the diaphragm central member joined to the perforated diaphragm member are made of different materials. 4. The diaphragm structure for a speaker according to claim 1, wherein an elastic layer is formed at a joint between the perforated diaphragm member and the diaphragm center member.