JPS59178098A - Honey-comb diaphragm of speaker - Google Patents

Abstract

PURPOSE:To decrease the split resonance generated at high frequencies by providing a dense and thin part to a skin member in a honey-comb diaphragm where the skin member is adhered to both faces of a honey-comb shaped core member. CONSTITUTION:The skin member 2 is adhered to both faces of the core member 1 with honey-comb aluminum or synthetic resin thin plate by using an adhesives. The skin member 2 is formed with the dense part 4 and a thin part 3. The dense and thin parts are obtained by changing press pressure in the process of skin member forming. Since the internal loss is increased partially by providing the dense and thin parts in this way, the split resonance generated at high frequencies is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a honeycomb diaphragm used as a diaphragm of a speaker.

As shown in Figure 1, a honeycomb-structured diaphragm has a honeycomb-shaped core material (1) made of a lightweight and rigid material such as aluminum or synthetic wood, and carbon fiber or chemical fiber on both sides. The skin material (2) impregnated with resin is bonded to the formed woven fabric using adhesive.9 It is lightweight and highly rigid compared to a normal diaphragm (2) and is widely used as a diaphragm for speakers. It became so.

However, the skin material attached to both sides of the core of a honeycomb diaphragm is formed by cutting a sheet into a circle and attaching it to both sides of the core material. It becomes uniform throughout, and the internal loss does not change.
When this honeycomb diaphragm is incorporated into a speaker and vibrated, it has the drawback of producing large peaks due to split resonance in the high frequency characteristics.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional products when molding skin materials.

This paper attempts to provide a honeycomb diaphragm for a speaker that uses paper with partially changed press pressure and partially increases internal loss to reduce split resonance that occurs at high frequencies. .

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, reference numeral 9(1) denotes a core material, which is made of a thin plate of aluminum or synthetic resin and formed into a honeycomb shape, as in the conventional case. (2) is a skin material attached to both sides of this core material with an adhesive, and this skin material is formed by paper-making pulp material. (3) is the sparse part of this skin material, and (4) is the dense part of the skin material. During the skin material forming process,
Obtained by changing the press pressure. That is,
The sparse areas (3) are formed by applying a weak press pressure, and the dense areas (4) are formed by applying a strong press pressure.

As shown in FIG. 2, the sparse portion (3) and the dense portion (4) are, for example, sparse at the inner periphery and dense at the outer periphery. When a boiler coil is incorporated into the inner periphery of the honeycomb diaphragm that has been formed in this manner and is vibrated, the sparse portion (3) of the skin material (2) will experience increased internal loss and mechanical loss, which would otherwise occur. It was possible to suppress the split resonance in the high frequency band, which was previously used, and absorb the peak. We also change the press pressure during paper making.

Alternatively, the internal loss of the skin material can be controlled by changing the ratio of sparse to dense.

In the above embodiment, the inner circumferential part is sparse and the outer circumferential part is dense, but contrary to this, it is also possible to provide sparse and dense patterns randomly or to provide sparse and dense patterns radially. be.

As described above, according to the present invention, the speaker is able to suppress the occurrence of split resonance in the high frequency characteristics by the simple means of partially changing the pressing pressure and providing dense and dense parts on the skin of the honeycomb diaphragm. This made it possible to obtain a honeycomb diaphragm.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a conventional diaphragm, and FIG. 2 is a vertical cross-sectional view of an embodiment of the present invention. In the figure, (1) is the core material, (2) is the skin material, and (3) is the core material.
) is a sparse area, and (4) is a dense area. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts. Procedures Amendment document (method) 1. Indication of the case Japanese Patent Application No. 58-52876 2. Name of the invention Honeycomb diaphragm for speaker 3. To the person making the amendment Representative Hitoshi Katayama Department 4 Agent 5 Order for amendment Date: June 28, 1982 (shipment date) 6. Full text of the specification to be amended 7. Reprint of the specification of the contents of the amendment (no change in content) 8. List of attached documents 1 or more copies Date 2, Name of the invention: Haninonom diaphragm 3 for speakers, Relationship to the amended case Patent applicant address 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Corporation Representative Katayama All the drawings will be corrected as shown in the attached sheet of the 8th division 4, the agent 5, the drawings subject to amendment 6, and the contents of the amendment. 7. Attached document correction drawing 1 copy or more

Claims (3)

[Claims] (1) In the honeycomb diaphragm of a speaker constructed by pasting skin materials on both sides of a honeycomb-shaped core material, when molding the skin material, press pressure is partially varied to make the skin material partially loose or dense. The honeycomb diaphragm of the speaker is characterized by the following features: (2) The honeycomb diaphragm for a speaker according to claim 1, wherein the skin material is formed by papermaking, and the pressing pressure is changed during papermaking to provide sparse and dense skins. (3) The diaphragm described in Patent No. 1, which uses a skin material with a small press pressure on the inner circumference and a large press pressure on the outer circumference.