JP2002165295A - Member for electroacoustic converter, and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a member for electroacoustic converters, having improved heat resistance, junction strength, and corrosion resistance and to provide a manufacturing method of the member, which is used for electroacoustic converters, such as loudspeakers used in electronic equipment and audio equipment. SOLUTION: To solve the problem of a basic metal layer 1f (formation treatment covering) is formed on the covering of zinc plating 1e through formation treatment by a solution containing a basic metal, instead of chromate treatment on the member for electroacoustic converters subjected to conventional zinc plating; at the same time, a silicon-based resin layer 1g of the like is provided as a water-soluble or water-dispersive resin layer, thus forming the covering having improved heat resistance and corrosion resistance and also improved junction properties, and improving the reliability and quality in zinc-plated components that are the members for electroacoustic converters.

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 electro-acoustic transducer used for an electro-acoustic transducer used for various kinds of audio equipment and a method for manufacturing the same.

[0002]

2. Description of the Related Art The prior art will be described with reference to a sectional view of a speaker shown in FIG. 4 which is a kind of an 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 connected to the magnetic circuit 1, 3 is an outer periphery connected to the frame 2 via an edge portion, and 3 is an inner periphery of the 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 whose outer periphery is coupled to the frame 2 and whose inner periphery is coupled to the voice coil 4.

The upper plate 1a, the lower plate 1c and the frame 2 bonded to the magnetic circuit 1 forming the magnetic circuit 1 of the loudspeaker constructed as described above are made of an iron-based metal material, and are rustproof. It has been common practice to perform a galvanizing treatment for (corrosion prevention) and to perform a chromate treatment on the galvanization to further improve the rust prevention (corrosion prevention) effect.

[0005]

In recent years, as electroacoustic transducers have become smaller and have higher performance, there has been a tendency to increase the output of speakers and the like. Among the requirements, in the prior art in which zinc plating is subjected to chromate treatment, there is a possibility that the surface condition varies, and there is a possibility that a problem such as lack of bonding may occur, which is also caused by the chromate film itself treated on the surface. It is considered that the bondability is not good, and the bondability also varies due to the variation in the thickness of the chromate film. Also,
The chromate film itself also has a problem that it lacks heat resistance. For example, if it is exposed for a long time in an atmosphere of 100 ° C., there is a possibility that the galvanized surface cracks and the corrosion resistance surface is hindered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a member for an electroacoustic transducer which has excellent heat resistance and good adhesive strength, and a method for manufacturing the same.

[0007]

Means for Solving the Problems To solve the above problems, the invention according to claim 1 of the present invention provides an inorganic basic metal on a metal component having a zinc or zinc alloy plating layer on the surface. A layer is provided, and a water-soluble or water-dispersible resin layer is further formed thereon. With the above-described configuration, it is possible to provide a metal electroacoustic transducer member having excellent heat resistance, corrosion resistance, and excellent bonding strength. Is what you do.

According to a second aspect of the present invention, an acrylic, melamine-based, or silicon-based resin layer is used as the water-soluble or water-dispersible resin layer of the first aspect of the present invention. It is intended to improve.

According to a third aspect of the present invention, a water-soluble or water-dispersible acrylic or melamine-based material is subjected to an acid activating treatment after galvanizing, followed by a step of providing a basic metal layer by a chemical conversion treatment. Coating the basic metal layer using any one of silicon-based resins,
An object of the present invention is to provide a method of manufacturing a member for an electroacoustic transducer excellent in corrosion resistance, heat resistance, and bonding strength.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a cross-sectional view of a main part of an upper plate which is a main part of an embodiment of the present invention. FIG. 2 shows the same bonding strength in comparison with the prior art for each environmental characteristic. FIG. 3 illustrates the bonding strength at the same heat resistance as compared with the prior art.

The difference between the present embodiment and the prior art relates to the surface treatment of a metal part. Therefore, only the part relating to the surface treatment will be described.

Reference numeral 1a denotes an upper plate in which a surface of a base member 1h made of iron is plated with zinc 1e as in the prior art, and an inorganic basic metal layer 1f is further provided on the surface of the upper plate. 1 g of a water-soluble or water-dispersible resin layer.

As is apparent from Table 1, up to the water washing step after No. 10 zinc plating is the same as that of the prior art, but instead of the conventional chromate treatment, the basic metal layer 1f is deposited (chemical formation). Treatment), water washing, formation of a resin layer 1g with a water-soluble or water-dispersible resin (finishing treatment), and drying, followed by surface treatment on the zinc plating 1e.

In the present embodiment, 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.).

[0016]

[Table 1]

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

In FIG. 2, (1) the heat resistance is the bonding strength after being left in an atmosphere at 100 ° C. for 240 hours. (2) The cold resistance is the bonding strength after being left in an atmosphere at −40 ° C. for 240 hours. Moisture resistance: bonding strength after leaving for 500 hours in an atmosphere of 55 ° C. and 95% (4) Thermal shock test: leave for 1 hour at −40 ° C.
The bond strength after 1000 cycles of one cycle in which the substrate is left in an atmosphere at 5 ° C. for 1 hour is shown in FIG. 3. (5) Heat resistance is shown in FIG. It shows the bonding strength after being left for 1 hour in an atmosphere at 250 ° C. for 1 hour. In addition, a shows each thing of this Embodiment, and b has shown the joint strength in the prior art, respectively.

As is clear from the above results, the present 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 of 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 addition, a sulfur gas test (5 PPM H ₂ S
After standing in a gas atmosphere for 1000 hours, the surface state is visually recognized)
No corrosion was observed in the case of the present embodiment, but corrosion was observed in 500 hours in the case of the prior art.
It became.

As described above, according to the present embodiment, it is possible to provide a member for an electro-acoustic transducer and a method for manufacturing the same, which have high reliability and excellent heat resistance.

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 has been described as an example, which has excellent characteristics as a member for an electroacoustic transducer and a method of manufacturing the same.
Zinc plating or zinc alloy plating is not limited to electro-acoustic transducers such as speakers, but is a mechanism such as a variable resistor used in places where bonding strength is required or where heat resistance and environmental resistance are strict. It has a wide range of uses as a component for electronic parts of components and a plating base material for electric (child) equipment.

[0025]

As described above, the present invention has a coating excellent in corrosion resistance and improves heat resistance, contributing to the development of an electroacoustic transducer excellent in input resistance, and also improving the bonding strength. An object of the present invention is to provide a member for an electroacoustic transducer having excellent quality and a method for manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an upper plate which is a main part of a speaker according to an embodiment of an electroacoustic transducer of the present invention.

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

Fig. 3 Comparison chart of heat resistance

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

[Description of Signs] 1 Magnetic circuit 1a Upper plate 1b Magnet 1c Lower plate 1d Magnetic gap 1e Zinc plating 1f Basic metal layer 1g Resin layer 1h Base member 2 Frame 3 Vibration plate 4 Voice coil 5 Damper

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Claims (3)

[Claims] 1. An electroacoustic device comprising: an inorganic basic metal layer provided on a metal component having a zinc or zinc alloy plating layer provided on a surface thereof; and a water-soluble or water-dispersible resin layer formed thereon. Transducer member. 2. The member for an electroacoustic transducer according to claim 1, wherein the water-soluble or water-dispersible resin layer is made of any one of acrylic, melamine, and silicon. 3. A method of performing an acid activation treatment after galvanizing, and thereafter providing a basic metal layer by a chemical conversion treatment, using any of a water-soluble or water-dispersible acrylic, melamine, or silicon-based resin. A method for producing a member for an electroacoustic transducer, wherein the member is coated on the basic metal layer.