JPH02158676A - Adhesive for speaker assembly - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a speaker assembly adhesive for bonding a voice coil and/or damper of a speaker to a diaphragm and for fixing lead wires to the diaphragm.

[, Conventional technology]

Determine the high-frequency characteristics of electrodynamic speakers, especially cone-type speakers.What is the high-frequency resonant frequency fh?

MO=　ma+md+mv+mx here.

ma: Additional mass of air md: Mass of cone mv: Mass of voice coil mX: Mass of adhesive, etc. at the bonding part between the voice coil and/or damper and the diaphragm, the lead wire bonding part.

It is known that the stiffness of sh::I-y is given by the stiffness of ffl.

Also, the output sound pressure level P is.

here.

ρ: Fresh air density S: Effective mass of perturbation plate F: Driving force d: Distance from the sound pressure source to the measurement point It is also well known that it is given by

From the above equation, in order to increase the high-frequency resonance frequency fh (and increase the output sound pressure level P, the mass of the cone md and the quality of the voice coil Jimv must be decreased.
It is known that the quality ftmx of the adhesive, etc. at the bonding portion between the voice coil and/or damper and the diaphragm and the lead wire bonding portion must be reduced.

In order to make it easier to understand the content of the present invention, the drawings show the bonded part of the adhesive of the present invention used for general speakers. Figure 1 shows the bonded part of the voice coil and/or damper and the diaphragm. This will be explained with reference to the sectional view shown in the drawing.

Place the voice coil l into the voice coil holder (not shown) K
After holding the voice coil 1, the damper 2 is inserted into the voice coil 1, and the adhesive 4 according to the present invention is applied to the inner periphery of the damper 2 using an automatic coating machine. After that, insert the diaphragm 3, and then insert the voice coil 1. The damper 2 and the diaphragm 3 are bonded together.

FIG. 2 is a sectional view showing the bonded portion of the lead wire. To explain this also with a drawing, lead a of voice coil 1
5 upward along the bobbin, and remove the voice coil 1.5 as shown in FIG. After bonding the damper 2 and the diaphragm 3, the lead wire 5 of the voice coil 1 is placed along the diaphragm 3, and adhesive 4 is applied to that part to connect the lead wire 5 of the voice coil 1 and the fitting plate 3. Glue and fix.

In an actual cone type speaker, for example, Mffkmv of the voice coil of a speaker with a diameter of 6 cm,
The average value of corn's '75 quantity md is.

mv = 0.03~0.06 (,!i')md =
0.03 to 0.06 (,9), and an adhesive of approximately o.osf1 is applied to the adhesive portion between the voice coil and/or the damper and the cone. The mass of this adhesive is about 0.08J? is cone quality ffimdl
It occupies a large weight with respect to fl fit mv of the voice coil.

In this way, especially in small-diameter speakers with a diameter of 1 oz or less, the mass of the vibration system, the adhesive part between the voice coil and/or damper and the cone, and the mass of the adhesive at the lead wire adhesive part have a large influence. and deteriorates the characteristics of the high frequency range.

Furthermore, a two-component acrylic resin composition is used for this adhesive part.

On the other hand, in order to increase the adhesive strength between the voice coil and/or damper and the cone, it is desirable to apply a larger amount of adhesive.

[Problem to be solved by the invention]

In this way, at the adhesive part between the voice coil and/or damper and the cone, and the adhesive part of the lead wire,
While there is a need to reduce the weight of the vibration system, especially the adhesive, there is also a need to maintain or increase the adhesive strength of this adhesive part.
These two demands are in a contradictory relationship.

Therefore, especially in small diameter threaded cars of 9 caliber 10(7) or less.

■ In the above example, approximately 0.08.9 g of adhesive is applied to the adhesive part between the voice coil and/or damper and the cone, but the dimensional accuracy of the adhesive part of the voice coil, damper and cone is (The roundness of each part.

Due to dimensional errors between parts (dimensional errors between parts) and deformation of these parts, gaps occur in the bonded parts, so the gap is approximately 0.10,! i'
It is necessary to apply adhesive. This is to maintain the adhesive strength of the bonded portion between the voice coil and/or damper and the cone.

In this case, the weight of the adhesive increases from approximately o, o s II to approximately 0, IO, 9, resulting in deterioration of the high frequency characteristics.

The sound pressure also decreases by about 0.3 dB. This goes against the request for lightweight adhesives.

(2) On the other hand, in response to the demand for lighter weight adhesives at the bonding portions between voice coils and/or dampers and cones, the amount of adhesive applied may be reduced, for example.

When it is about 0.05.9, the bonding area between the voice coil and/or damper and the cone decreases, the bonding strength decreases, and the bonding becomes incomplete.

■ Also, two-component acrylic adhesives have lower viscosity and structural viscosity than solvent-based rubber adhesives, so the adhesive will flow from the gap between the voice coil and/or damper and cone bond. the voice coil and/or
Or the adhesive area between the damper and the cone is reduced,
Adhesive strength decreases and adhesion becomes incomplete.

[Means to solve the problem]

Balloons have been increasingly used in recent years to improve the performance of materials and save energy.

■Reducing the weight of plastics (automobile parts 2: artificial celestial stones, etc.) ■Paints (exterior wall paint, thick paint, three-dimensional ink, etc.) ■Marine buoyancy bodies (floating nets, life preservers, etc.) ■Insulating materials ■Concrete , lightweight aggregate for mortar■Used in a variety of product components, including structural core materials for FRP ships, minesweepers, surfing boards, etc., and various balloons are used depending on the purpose.

Balloons are called micro balloons, micro squares, hollow bubbles, etc. 2 Usually 5 to 3 OO? : A name given to a microscopic hollow sphere the size of a chron.There are inorganic and organic types. Typical examples include glass balloons, silica balloons, glass balloons, carbon balloons, phenol balloons, vinylidene chloride balloons, alumina balloons, and zirconia balloons.

Among these many balloons, two balloons can be used in the adhesive described in claim 1.

0 Particle size is sufficiently fine < (10-100 micron salt) 2 Particle size must be uniform.

■ Those with a true specific gravity of 0.02 to 0.7 0 Those that have strong strength and will not be destroyed in the dispensing machine ■ Those that are compatible with adhesives and do not cause abnormalities such as separation or gelation during storage. You need something to do. Therefore, vinylidene chloride balloons and glass balloons were used.

Generally, in order to reduce the true specific gravity of an organic balloon, the thickness of the shell is reduced. 0 Increase the particle size.

The following methods have been adopted. but.

The film thickness is about 1 micron, and the true specific gravity of the balloon is 0.
In order to make it 7 or less, the particle size must be larger than 10 microns. On the other hand, if the diameter of each particle is larger than 100 microns, there is a risk that the particles may become clogged or destroyed in an automatic dispensing machine used during speaker production, which is not preferable. Therefore, it is preferred that the particle size is 10-100 microns.

[Effect]

In the present invention, at least one of an organic balloon or an inorganic balloon (hereinafter referred to as balloon) is added to a two-component acrylic adhesive containing at least an acrylic functional monomer, so that the voice coil and/or damper and the diaphragm It has the following effects at the bonded part.

■The volume increases compared to the same weight of adhesive without balloons added.I-2 ■If the bonding area between the voice coil and/or damper and the diaphragm is the same, then the same weight of adhesive without balloons increases. However, its weight becomes smaller.

That is, when the adhesive strength between the voice coil and/or damper and the diaphragm is maintained, the weight of the adhesive is reduced.

■ Therefore, without reducing the adhesive strength between the voice coil and/or damper and the diaphragm, it is possible to reduce the weight of the adhesive at the bond between the voice coil and/or damper and the cone, thereby increasing the weight of the vibration system. The ring can be made lighter, and for this purpose the speaker's high resonance frequency fh can be increased.

Moreover, the sound pressure can also be increased to improve the characteristics of the high frequency range.

Also.

■ The viscosity is higher than that of a two-component acrylic adhesive that does not contain balloons, and is comparable to that of a solvent-based rubber adhesive. Adhesive does not flow from the gap between the adhesive part of the line and the cone.

Further, the lead wire bonding portion has the following effects.

■ For the same weight of adhesive without the addition of balloons,
Its volume increases, and the weight of the adhesive that fixes the lead wire to the diaphragm becomes smaller.

Also.

■ Balloons reflect light diffusely, so they have more hiding power than adhesives of the same weight without balloons, making it possible to fix and hide lead wires with a smaller amount.

■ Therefore, it is possible to reduce the weight of the perturbation system by using a lighter adhesive at the lead wire bonding part, thereby increasing the speaker's high resonance frequency fh and increasing the sound pressure. It is possible to improve the characteristics of the treble range.

Next, examples of two-component acrylic adhesives containing acrylic functional monomers will be shown.

〔Example〕

*1: *2: Organic substance balloon A...vinyritine chloride balloon particles 1
210-50 true specific gravity approximately 0.04 Organic balloon B...vinylidene chloride balloon particles
40 to 504 true specific gravity approximately 0.2 *4: Adhesive strength: Cotton canvas T peel strength after 24 hours These examples also have specific gravity, viscosity, 8 structural viscosity coefficient, etc. Meets the effect.

Furthermore, when the specific gravity of the adhesive is less than 0.7, the amount of balloon added increases, resulting in a decrease in adhesive strength.

In addition, the reliability of adhesion decreases due to increased variation.

On the other hand, when the specific gravity is set to 0.9 or more, the intended effect of improving speaker characteristics due to weight reduction is small.

Therefore, it is preferable that the specific gravity is in the range of 0.7 to 0.9.

An example of the materials mentioned in the examples is shown below.

■Two-component acrylic adhesive “Dialock” manufactured by Diabond Industries, etc. ■Organic balloon “Matsumoto Micro Square” manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd. 0 “Expancel” manufactured by Nippon Philite Co., Ltd. 0 = Tank uniform balloon Fuji "Micro Balloon" manufactured by Deguison etc. Compatibilizer Various coupling agents (silane type).

Two-component acrylic adhesives such as titanium-based adhesives generally contain acrylic functional monomers such as methacrylic acid alkyl esters as the main component, and non-functional monomark polymers are blended as modifiers. A peroxide and a curing accelerator are mixed as an initiator and are divided into a part A and a part B, respectively.
There is.

-Give me an example.

Methyl methacrylate 2- and droxyethyl methacrylate acrylonitrile-butadiene rubber cumene hydrobarogide iron-polyamine chelate [Effects of the invention] The present invention provides at least aque A agent, B agent 20 parts by weight, 20 parts by weight lylic functional 7 Balloons (organic or inorganic) are added to the two-component acrylic adhesive containing Nomar, which reduces the weight of the adhesive and reduces vibration while maintaining the adhesive strength between the voice coil and/or damper and the diaphragm. The weight of the system can be reduced, and for this reason, the high-frequency resonant frequency fh of the speaker can be increased, and the sound pressure can also be increased, improving the high-frequency characteristics. The viscosity and structural viscosity are higher than that of a two-component acrylic adhesive without additives, and are equivalent to those of a solvent-based rubber adhesive.
This has the effect that the adhesive does not flow from the gap between the voice coil and/or the damper and the cone.

[Brief explanation of the drawing]

The drawings show the bonded portion when the adhesive of the present invention is used in a speaker, and FIG. 1 is a sectional view showing the bonded portion between the voice coil F6 and/or the damper and the diaphragm. FIG. 2 is a sectional view showing the bonded portion of the lead wire. In the figures (Figures 1 and 2), l is the voice coil. 2 is the damped wire. 3 is the diaphragm. 4 is adhesive. 5 lotus

Claims (3)

[Claims] (1) A speaker assembly adhesive comprising at least one of an organic balloon or an inorganic balloon added to a two-component acrylic adhesive containing at least an acrylic functional monomer. (2) The adhesive for speaker assembly according to claim (1), wherein the adhesive has a specific gravity of 0.7 to 0.9. (3) The speaker assembly adhesive according to claim 1, wherein the organic balloon is made of vinylidene chloride or a copolymer thereof and has a particle size of 10 to 100 microns.