JPS59178897A - Honey-comb diaphragm of speaker - Google Patents

Abstract

PURPOSE:To suppress the resonance with a peak and to improve acoustic characteristic by using the skin manufactured to sheets and provided with ruggedness having thin and dense material quality concentrically to the skin adhered to both faces of a core member. CONSTITUTION:The skin 12 on the surface adhered on one face of the core member by means of an adhesives is formed by manufacturing to sheets a pulp fiber with press forming. Lots of projections 1 are formed on circumferences on the surface of the skin 12 are formed and the projected parts and recessed parts 14 between the projections form alternately annuraly. The press pressure of the projections 13 is large in the hardness of the skin 12 because the projected parts 13 and the recessed parts 14 are formed by applying a press pressure to the paper manufactured to sheets, the composition is made thin and soft, and the recessed parts 14 has a large press pressure and the composition is made dense and formed hard. In incorporating a voice coil to the inner circumference of the honey-comb diaphragm thus formed and vibrating the assembly, the mechanical internal loss is larger at the thin part formed with lots of the projected parts 13 of the skin 12, the resonance with a peak at a high frequency is suppressed so as to obtain a flat sound pressure versus frequency characteristic.

Description

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

As shown in Figure 1, the honeycomb diaphragm of a conventional speaker consists of a core material 1 formed into a honeycomb shape made of a light and rigid material such as aluminum or synthetic resin, and carbon on both sides. a
The honeycomb diaphragm is formed by punching out a sheet-like woven fabric made of fibers, glass fibers, etc. into the shape of a diaphragm, and bonding the skin material 2 impregnated with resin with an adhesive. The disadvantage of the formed paper cone is that it has a large internal loss, but compared to a paper cone that has small bending rigidity and does not have a large specific elastic modulus, the density ρ of the diaphragm is small because there is an air chamber inside the diaphragm. In addition, due to the honeycomb structure, the bending rigidity is large and the specific elastic modulus E/ρ
It has the characteristic that it is sufficiently larger than a paper cone. However, in the honeycomb diaphragm of such conventional speakers, the skin material attached to both sides of the core material is sheet-like, so the surface is smooth and has a uniform density, so the internal loss of the skin is due to the material. It is difficult to increase the internal loss, and peak resonance tends to occur.

This invention was made in order to eliminate the drawbacks of the conventional products as described in 2.The skin of a fly cam diaphragm is made of paper, and the surface of the skin is made of convex and concave parts, and the convex parts are sparse. The purpose of this invention is to provide a honeycomb diaphragm with flat sound pressure frequency characteristics by forming the recesses densely and increasing the internal loss of the skin material to suppress peak resonance.

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

In Fig. 2, 1N is a core material which is made of a thin plate of aluminum, synthetic resin, or paper formed into a honeycomb shape, as in the conventional case. Reference numeral 12 denotes a surface skin attached to one side of the core material with an adhesive, and is formed by press-molding pulp fibers into paper. A large number of convex portions 13 are formed on the surface of the skin 2 on the circumference, and the concave portions 14 between the convex portions alternate in an annular shape. The hardness of the skin 12 is determined by the fact that the convex portions 13 and concave portions 14 are formed by applying press pressure to paper that has been skimmed to the same thickness through paper making, so the press pressure for the convex portions 13 is small and the structure thereof is sparse. The soft concave portion 14 is formed under a large pressing pressure, and its structure becomes dense and hard. Reference numeral 15 indicates the back side skin, which is a conventional cloth made of carbon fiber, glass fiber, etc., impregnated with resin.

When a boiling coil (not shown) is installed in the inner circumference of the honeycomb diaphragm formed in this way and vibrated, the skin 1
A flat sound pressure circumference LB1.2 suppresses the peak resonance in the high frequency region that conventionally occurs due to large mechanical internal loss in the sparse portions where many convex portions 13 are formed. You can obtain numerical properties. In addition, by selecting the number and size of the convex portions 13 or by changing the pressing pressure, and by changing the back side skin by pasting a skin material with convexes and concave areas, it is possible to obtain different characteristics. Various types of honeycomb diaphragms can be obtained.

As described above, according to the invention of Party B, by using a paper skin that is attached to both sides of a core material and having concentric convexities and concavities with sparse and dense material, peak resonance can be suppressed. The honeycomb diaphragm of the speaker has the advantage of being able to suppress noise and having good acoustic characteristics.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional honeycomb diaphragm, and FIG. 2 is a sectional view of a honeycomb diaphragm according to an embodiment of the present invention. In the figure, 11 is a core material, 12 and 15 are skin materials, 1
3 is a convex part, and 4 is a fourth part. Agent: Kuzuno - Figure 1

Claims (2)

[Claims] (1) In the flycam diaphragm of a speaker constructed by pasting skin materials on both sides of a honeycomb-shaped core material, the skin material is formed by papermaking, and convexes and concave portions are formed on the surface of the skin material, and the skin material is attached to the convex portions. The honeycomb diaphragm of the speaker is characterized by its structure in which the concave portions are densely packed. (2) A honeycomb diaphragm for a speaker according to claim 1, wherein a skin material having convex and concave portions is adhered to one side of a core material.