JP2002305791A - Member for electroacoustic transducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for an electroacoustic transducer applicable to an electroacoustic transducer such as a speaker used for electronic devices and acoustic devices that has excellent heat resistance, adhesion strength and corrosion resistance. SOLUTION: A basic metallic layer if (formation film) is formed on the surface of the member for the electroacoustic transducer through the forming processing using a solution containing a basic metal in place of chromate processing on the member for the electroacoustic transducer subjected to zinc plating 1e and a resin layer 1g made of a silicon group or the like is placed on the surface as a water soluble or water dispersion resin layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member for an electroacoustic transducer used in various audio equipment.

[0002]

2. Description of the Related Art The prior art will be described with reference to a cross-sectional view of a speaker shown in FIG. 4, which is a kind of electroacoustic transducer.

According to FIG. 1, reference numeral 1 denotes an upper plate 1a, a magnet 1b, and a lower plate 1c having a center pole.
2 is a frame adhesively bonded to the magnetic circuit 1, 3 is an outer circumference connected to the frame 2 via an edge portion, and an inner circumference is a magnetic gap of the magnetic circuit 1. Reference numeral 1 denotes a diaphragm coupled to the voice coil 4 fitted in 1d. Reference numeral 5 denotes a damper having an outer periphery coupled to the frame 2 and an inner periphery coupled to the voice coil.

The upper plate 1a, the magnet 1b,
The lower plate 1c and the frame 2 adhesively bonded to the magnetic circuit 1 are formed of an iron-based metal material, and are respectively galvanized for rust prevention (corrosion prevention), thereby further improving the rust prevention (corrosion) effect. It has been common practice to perform a chromate treatment on the zinc plating in order to achieve this.

[0005]

The above-mentioned electro-acoustic transducer tends to be small and high power in the field of miniaturization and high performance of equipment.
Parts used in electroacoustic transducers are also required to have improved heat resistance.

[0006] Under the above-mentioned tendency, the prior art in which a conventional zinc plating is subjected to a chromate treatment is required to have improved heat resistance.

For example, in the case of the prior art, when exposed in an atmosphere at 100 ° C. for a long period of time, the galvanized surface cracks and there is a possibility that the corrosion-resistant surface may be affected.

An object of the present invention is to provide a member for an electroacoustic transducer which solves the above-mentioned conventional problems.

[0009]

Means for Solving the Problems In order to solve the above problems, a member for an electroacoustic transducer of the present invention is constituted as follows.

The invention according to claim 1 of the present invention is characterized in that a colloidal silica containing aluminum is coated with a treatment liquid containing an inorganic basic metal compound,
Further, a water-soluble or water-dispersible resin layer containing colloidal silica is further formed thereon, so that a member for an electroacoustic transducer excellent in heat resistance, corrosion resistance and bonding strength can be provided.

According to a second aspect of the present invention, the inorganic basic metal compound according to the first aspect is replaced with a titanium compound.
It is one of a cobalt compound and a silicate compound, and can provide a member for an electroacoustic transducer excellent in heat resistance, corrosion resistance, and bonding strength.

According to a third aspect of the present invention, the water-soluble or water-dispersible resin layer according to the first aspect is formed of an acrylic resin,
It is either melamine-based or silicon-based, and can further improve corrosion resistance.

According to a fourth aspect of the present invention, there is provided the electroacoustic transducer member according to the first aspect, wherein a zinc-plated base material is used. This contributes to improving the bonding strength.

According to a fifth aspect of the present invention, there is provided the electroacoustic transducer member according to the first aspect, wherein the magnet and / or the magnet constitute a magnetic circuit portion for a speaker. A sufficient strength can be obtained not only in the rust effect but also in joining with a magnet having a rough surface state.

According to a sixth aspect of the present invention, the magnet according to the fifth aspect is a neodymium-based magnet, and even if a neodymium-based magnet having a poorer bonding state than a conventional magnet is used, sufficient bonding can be achieved. Strength can be obtained.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. Note that the same parts as those in the related art are denoted by the same reference numerals, and description will be omitted.

FIGS. 1A and 1B are cross-sectional views of a metal member (upper plate) and a neodymium magnet, which are main parts of an embodiment of the present invention. FIG. FIG. 3 illustrates the bonding strength at the same heat resistance in comparison with the conventional technology.

The difference between the present embodiment and the prior art is related to the surface treatment of the neodymium magnet and the magnetic circuit. Therefore, the part related to the surface treatment will be described.

An upper plate 1a is provided with an inorganic basic metal layer 1f by a chemical conversion treatment on a zinc plating 1e formed on a base member (plate) 1h in the same manner as in the prior art, and further a finishing treatment thereon. 1 g of a water-soluble or water-dispersible resin layer.

Reference numeral 1b denotes a neodymium magnet. An inorganic basic metal layer 1f is provided on the surface of the magnet 1i by a chemical conversion treatment, and a water-soluble or water-dispersible resin layer 1g is further provided thereon by a finishing treatment. Provided.

In the present embodiment, a metas ESC (manufactured by Yuken Industries Co., Ltd.) containing a silicate containing a basic metal is used for the chemical conversion treatment, and a water-soluble or water-dispersible finishing agent is used for the finishing treatment. Was used, a silicon-based Metas-99 (manufactured by Yuken Industries Co., Ltd.).

FIGS. 2 and 3 show the results of comparison of the joining strength between the neodymium magnet 1b and the upper plate 1a (joining area is set to about 30 cm ² ) with that of the prior art.

In the prior art, the upper plate is plated with zinc and then subjected to a chromate treatment. On the neodymium magnet, the surface is plated with aluminum and the chromate treatment is performed thereon. It is something.

The heat-resistant strength in FIG. 2 is a bonding strength after leaving in an atmosphere of 100 ° C. for 240 hours and a cold-proof strength is −40.
The bonding strength and humidity resistance after leaving for 240 hours in an atmosphere of 55 ° C. were 55 ° C. The bonding strength and the thermal shock strength after leaving for 500 hours in an atmosphere of 95% were left for 1 hour at −40 ° C., and immediately 8
The bond strength after 1000 cycles of 1 cycle in a state of being left in a 5 ° C. atmosphere for 1 hour. The heat resistance in FIG. 3 is the bond strength after being left in a 150 ° C. atmosphere for 1 hour, and the 200 ° C. atmosphere. Bonding strength after leaving for 1 hour in
It shows the bonding strength after being left in an atmosphere of 50 ° C. for one hour. In addition, a shows the thing of this Embodiment, b shows the joining strength in a prior art.

As is evident from the above results, this embodiment is superior to the conventional one in all other characteristics except that the strength of the present embodiment is comparable to that of the prior art in the moisture resistance strength. It was confirmed that.

In the salt spray test (visualization of the surface state after 3 or 6 cycles, in which 5% NaCl solution is sprayed in an atmosphere at 35 ° C. for 8 hours and drying is performed for 16 hours as one cycle), three cycles of the conventional technique are used. No difference was found between the sample of the present invention and that of the present embodiment, but after 6 cycles, the conventional sample showed corrosion and was judged as NG, but the sample of the present embodiment did not show corrosion. Was.

In a sulfur gas test (visual observation of the surface state after standing for 1000 hours in an atmosphere of 5 PPM H ₂ S gas), no corrosion was observed in the case of the present embodiment, but 500 in the case of the prior art. Corrosion is seen in time, NG
It became.

It should be noted that the neodymagnet has a problem that the plating surface condition is apt to vary and the bonding property is lacking. Adhesion is not good, metal plating,
Although it is considered that the bonding property varies due to the variation in the thickness of the chromate film, it is presumed that the present embodiment solves these problems and improves the bonding strength.

As described above, according to the present embodiment, it is possible to provide a member for an electroacoustic transducer having high reliability and excellent quality with respect to heat resistance and a method of manufacturing the same.

In the present embodiment, a silicate containing a basic metal is used for the chemical conversion treatment, but any one of a titanium compound, a cobalt compound and a silicate compound which is an inorganic basic metal compound is used. Is possible.

In this embodiment, a silicon-based water-soluble or water-dispersible resin is used as the finishing agent. However, in addition to the silicon-based resin, an acrylic or melamine-based water-soluble or water-dispersible resin is used. It is also possible to use.

In the above-described embodiment, a speaker is used as an example, and a metal part plate constituting a neodymium magnet and a magnetic circuit is subjected to rust prevention treatment to have excellent characteristics including reliability and a method of manufacturing the same. However, this rust-proofing method is not limited to rust-proofing of neodymagnets such as speakers and metal plates that constitute a magnetic circuit, but requires bonding strength, heat resistance and environmental resistance. Its application is wide as a component for electronic parts of mechanical parts such as variable resistors used in places where the demands on properties are severe and as a rust preventive treatment for electric (child) equipment.

[0033]

As described above, the present invention can be easily produced, has a film having excellent corrosion resistance, and has improved heat resistance, contributing to the development of a speaker having excellent input resistance and improving the bonding strength. An object of the present invention is to provide a magnet which constitutes a speaker magnetic circuit having excellent quality, a rust preventive treatment for a plate which is a metal part, and a method for producing the same.

[Brief description of the drawings]

1A and 1B are cross-sectional views of an upper plate and a neodymium magnet, which are main parts of a speaker according to an embodiment of an electroacoustic transducer member of the present invention.

FIG. 2 is a comparison diagram comparing the bonding strength between the plate and the neodymium magnet and the conventional product.

Fig. 3 Comparison chart of heat resistance

FIG. 4 is a sectional view showing a configuration of a conventional speaker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic circuit 1a Upper plate 1b Neodymium magnet 1c Lower plate 1d Magnetic gap 1e Zinc plating 1f Basic metal layer 1g Resin layer 1h Base member (plate) 1i Magnet 2 Frame 3 Diaphragm 4 Voice coil 5 Damper

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) C08L 83/00 C08L 83/00 101/12 101/12 C09D 1/00 C09D 1/00 133/00 133/00 161 / 28 161/28 183/00 183/00 201/00 201/00 F term (reference) 4D075 AE03 BB72X CA13 CA18 CA33 DA06 DB05 DC18 EA06 EA10 EB22 EB32 EB42 EC03 4J002 BG001 CC181 CP001 DJ016 GH00 GQ00 HA04 HA07 4J038 AA011 HA216 HA441 HA446 HA456 MA07 MA08 MA10 NA09 PB03 PB09 PC02 5D012 BB01 EA01 EA04 FA09

Claims (6)

[Claims] 1. A water-soluble or water-dispersible resin layer comprising a colloidal silica containing aluminum, which is coated with a treatment liquid containing an inorganic basic metal compound, and further coated thereon. A member for an electro-acoustic transducer formed with: 2. The electroacoustic transducer member according to claim 1, wherein the inorganic basic metal compound is any of a titanium compound, a cobalt compound, and a silicate compound. 3. The member for an electroacoustic transducer according to claim 1, wherein the water-soluble or water-dispersible resin layer is one of an acrylic resin, a melamine resin, and a silicon resin. 4. The member for an electroacoustic transducer according to claim 1, wherein the member for an electroacoustic transducer has a base material plated with zinc. 5. The member for an electroacoustic transducer according to claim 1, wherein the member for an electroacoustic transducer comprises a magnet and / or a magnet circuit comprising the magnet. 6. The electroacoustic transducer member according to claim 5, wherein the magnet is a neodymium magnet.