JPS63146687A - Speaker - Google Patents

Abstract

PURPOSE:To obtain a diaphragm having light and flexible edge with excellent molding property and strength by providing the edge obtained through the impregnation and working of an thermoplastic acrylic rubber to a paper-making sheet using Manila hemp as the major component to the diaphragm. CONSTITUTION:The diaphragm 11 is of free edge type and the edge 13 obtained by impregnating a thermoplastic acrylic resin with excellent flexibility to a fiber sheet using Manila hemp as the major component and applying heat mold working is mounted to the peripheral part of a cone part 12 formed by paper- making pulp fiber and molding it. The edge 13 formed by impregnating the flexible acrylic resin to the sheet made of fiber of the Manila hemp as the major component is fitted to the diaphragm at the same time the edge is molded by pressing and heating. Moreover, Japanese paper such as KOZO or MITSUMATA is used in place of Manila hemp. Similarly, a flexible rubbery resin such a urethane group, SBR or NBR is used in place of the acrylic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to speakers used in various types of audio equipment.

BACKGROUND OF THE INVENTION Conventionally, this type of speaker has been provided with edges of a speaker diaphragm formed by applying an acrylic copolymer emulsion to a sheet of link pulp. Other conventional examples include foamed urethane sheets and those with edges formed by coating fabric edges with rubber.

In general, there are two types of speaker diaphragms: a free edge type, in which the edge portion and the cone portion are made of different materials, as shown in the example above, and a fixed type, in which the cone portion and the edge portion are integrally molded.

Problems to be Solved by the Invention However, as shown in FIG. 2, the fixed type diaphragm has a corrugated ridge 2 formed around a cone portion 1 to form an edge portion. The diaphragm with this configuration is made of paper 1 synthetic resin film, etc., and is light overall and is effective in improving efficiency. Can only be used with small speakers. In addition, the free edge type diaphragm has a cone portion 10 as shown in FIG.
It is constructed by pasting an edge 3 made of cloth, foamed urethane sheet, etc. to the peripheral edge. This configuration has the advantage that a large compliance can be obtained as the edge 3, but has the disadvantage that the mass increases and the efficiency of the speaker decreases.

In view of the above, there has been a desire for an edge that is lightweight, flexible, has good formability, and has excellent strength as a material for making speaker diaphragms. For this reason, a free edge type edge, in which a lintabulp sheet is coated with a rubber material, has been proposed and put into practical use, but it has poor moisture resistance and low strength. Because the strength of the sheet itself is weak, edge forming is difficult, and deep corrugated shapes can cause cracks, leaving many issues unsolved.

Therefore, the present invention is lightweight, flexible, and moldable.

The present invention provides a diaphragm having edges with good strength.

Means to Solve the Problem In order to solve this problem, the present invention impregnates a paper sheet made mainly of manila hemp, which has good bending resistance, with thermoplastic acrylic rubber material, which has good flexibility. The present invention provides a speaker comprising a diaphragm using an edge obtained by the method. In addition, Manila hemp sheets are made of Japanese paper, ie, sheets whose main ingredients are sanipoku, sushi, etc., and acrylic or urethane-based SBR.

Edges obtained by impregnating an NBR-based rubbery resin with excellent flexibility may also be used.

Function As mentioned above, in order to improve flexibility, improve strength, and reduce weight, flexible valve seats are made of Manila hemp, which is one of the strongest natural pulp fibers, or washi paper such as Tate or Sanpoku. The sheet obtained by impregnating a thermoplastic resin with excellent properties, such as acrylic rubber, and thermoforming the sheet is light and flexible, has good moldability, and is water resistant and resistant. Not only can it provide excellent reproduction from low to high frequencies for input, it also improves efficiency and exhibits excellent effects.

In addition, since it is impregnated with thermoplastic resin, heat and pressure are applied when forming the edges, so there is no need for adhesive on the diaphragm, and the impregnated resin itself acts as an adhesive to bond it to the diaphragm. It has great industrial value as an edge, and has good workability.

EXAMPLE Below, the speaker of the present invention will be explained with reference to FIG. 1, which shows an example.

Reference numeral 4 denotes a field part, and here it is an external magnet type field part, and a plate 6 with a center pole 6 erected in the center of the upper surface, a ring-shaped magnet 7 placed on this plate 6, and a ring-shaped magnet 7 placed on this magnet 7. It is constructed by arranging a ring-shaped upper plate 8 and bonding these together with an adhesive.

A frame 9 is connected to the field part 4 by welding or the like, and a diaphragm 1 is attached to the peripheral edge of the frame 9 along with a gasket 1o.
1 are combined.

This diaphragm 11 is of the above-mentioned free edge type, and has a cone portion 1 made of pulp fibers and molded.
The edge 13, which is obtained by impregnating a fiber sheet mainly made of manila hemp with a thermoplastic acrylic resin with good flexibility and then thermoforming it, is attached to the peripheral edge of the fiber sheet 2. .

This edge 13 is made of a sheet obtained mainly from Manila hemp fibers impregnated with a highly flexible acrylic resin, and the edge is attached to the perturbation plate at the same time as the edge is formed by pressure and heating.

Instead of Manila hemp, it is also possible to use Japanese paper such as Sangyoku or Gon. Similarly, instead of the acrylic resin, a flexible rubbery resin such as urethane, SBR, or NBR may be used.

The material according to the present invention, Soji 13, is a lightweight, strong, flexible edge with good water resistance.

At the center of the diaphragm 11 having such an edge 13, there is a coil bobbin 15 with a voice coil 14 wound around the lower outer periphery.
The middle part of the coil bobbin 15 is supported by a damper 16, fits into the magnetic gap of the field part 4 without eccentricity, and a dust cap 17 is attached to the center part of the upper surface of the diaphragm 11. ing.

As described above, the speaker of the present invention is constructed so that the edge of the diaphragm has greater compliance than a fixed type, is lighter than a free edge type, has good moldability, and has low frequency It can reproduce excellent frequency characteristics from low to high frequencies, improves efficiency, provides a speaker with good sound quality, and is easy to work with, so it has great practical value.

Next, a specific example of the process and process of the present invention will be explained.

Specific Example: A sheet of 100 parts Manila hemp is used as a base material. The sheet weighs 3ogβ and 35jq/772'.

An acrylic resin (Daido Kasei Vinizol 101) is added to this by impregnation at 4ofi/yn'.

That is, a Ko-Fuji material sheet with a total weight of 70 g/rrf and 75 g β is made. A process consisting of an edge obtained by molding this, an edge coated with rubber on cloth, and a Rinta half sheet (Rinta Parbushi~) 40 i/W
Rubber resin 30j9/gold to t' and total weight 7og/M
). (1°α speaker) The speaker's input resistance is when the edges are not damaged by continuous loading with white noise for 1000 hours.

The bending resistance is determined by the MIT chuck test (according to JIS standards) of the sheet.

In addition to the above-mentioned embodiment of the edge of the present invention, similar experiments were conducted using an oval and a triode instead of Manila hemp, but the results were almost the same. In addition, the result obtained by impregnating urethane SBR system in addition to acrylic resin is that the lowest common frequency f of the speaker
o was different and was slightly higher by 6 to 1 oMz, but similar results were obtained in physical properties such as the input resistance of the speaker.

Effects of the Invention As described above, the present invention is lightweight, highly flexible, and uses a diaphragm having edges with good strength, which allows excellent reproduction from low to high frequencies, and facilitates mass production with high efficiency. It is rich.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a speaker according to the present invention, and FIGS. 2 and 3 are sectional views of essential parts of a diaphragm of a conventional speaker. 4...Field section, 9...Frame, 11
...Diaphragm, 12...Cone i, 13
...Etsuji, 14...Voice coil. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3

Claims (1)

[Claims] Manila hemp, kozo, mitsumata,
Edges are formed by impregnating a paper sheet made primarily of natural pulp fibers such as bast with highly flexible acrylic resin, urethane resin, rubbery thermoplastic resin such as SBR, and NBR. A speaker comprising: a diaphragm, and a voice coil that fits into the magnetic gap of the field section.