JP2003259483A - Resin speaker diaphragm and speaker using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speaker used for various audio devices and a resin speaker diaphragm which can be emphasized visually and is excellent in preventing deterioration of sound quality and an increase in cost. <P>SOLUTION: This resin speaker diaphragm has fine grooves 2b with the same pitch of 0.7 to 2 μm on its surface. Light is separated by diffraction, and iridescent reflected light is obtained. This makes is possible to visually emphasize the diaphragm without pasting a hologram sheet on it, prevent an increase in weight caused by pasting the hologram sheet or deterioration of sound quality, and provide the speaker and diaphragm at a low cost. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin diaphragm for a speaker used in various audio equipment and a speaker using the same.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 5 is a half cross-sectional view of a conventional speaker, and FIG. 6 is a full cross-sectional view of an injection molding die used for injection molding which is a general method of forming a speaker resin diaphragm, which is the main part. .

As shown in FIG. 1, a magnetic circuit 13 is composed of a lower plate 14 having a center pole, a ring-shaped magnet 15 and a ring-shaped upper plate 16, and a frame 6 is provided on the upper surface of the magnetic circuit 13. Are combined.

Reference numeral 7 is a voice coil, the lower part of which is joined to the middle part of the voice coil 7 so that the lower part is fitted into the magnetic gap 17 of the magnetic circuit 13 without being eccentric, and the outer periphery is connected to the frame 6. It is supported by a combined suspension 18.

Reference numeral 2 is a speaker resin diaphragm, the outer peripheral portion of which is joined to an edge 4, the outer peripheral portion of the edge 4 is joined to a frame 6 together with a gasket 5, and the speaker resin diaphragm is further attached. The inner peripheral portion of 2 is coupled to the upper portion of the voice coil 7.

Reference numeral 19 is a dust cap connected to the speaker resin diaphragm 2, 20 is a lead wire at both ends of the voice coil 7, and 21 is a surface of the speaker resin diaphragm 2. A pair of crimped eyelets,
One end of each tinsel wire 22 and each lead wire are soldered with this eyelet 21, and the tinsel wire 2
The other end of 2 is soldered to a terminal 24 of a connector 23 fixed to the frame 6.

At least a part of the lead wire 20 is coated with an adhesive and fixed to the diaphragm 2.

In addition, the lead wire 2 is used for the various connections described above.
The most general method is to use an adhesive that is suitable for each joining position, as in the case of the zero fixing to the diaphragm 2.

In the speaker constructed as described above, when an input signal is applied from the connector 23 to the voice coil 7 through the terminal 24 and the tinsel wire 22, the voice coil 7 is operated according to Fleming's left-hand rule. It is driven, and the resin vibration plate 2 for the speaker oscillates by this driving force to radiate sound into the air.

More specifically, the speaker resin diaphragm 2 configured as above will be described in more detail. The speaker resin diaphragm has excellent environmental resistance, and the user can see the speaker (especially for speakers). When used in a state in which the surface of the resin diaphragm 2 and the dust cap 19 can be seen), since it can be made more colorful than a pulp diaphragm, it is generally used as a speaker for vehicle audio equipment.

The manufacturing process of the above speaker resin diaphragm 2 will be described with reference to the cross-sectional view of the injection molding die shown in FIG.

In the figure, 9 is a sprue bush, 3
Reference numeral a is a fixed side insert, 1a is a movable side insert, 10 is a protruding pin, and 11 is a space for forming the speaker resin diaphragm 2 formed between the fixed side insert 3a and the movable side insert 1a.

The resin injected from the injection molding machine passes through the sprue bush 9 and is filled in the space 11 formed between the fixed-side insert 3a and the movable-side insert 1a. After cooling and solidification, the mold is opened and the ejection pin 10 is inserted. And the resin diaphragm 2 for the speaker is formed.

When it is desired to give a special gloss such as gloss to the design, a hologram sheet (not shown) is attached to the surface of the speaker resin diaphragm 2.

[0015]

As described above, in the conventional method of manufacturing the speaker resin diaphragm 2 for the speaker, the fixed-side insert 3a and the movable-side insert 1 which constitute the product portion of the injection molding die are described.
The surface of a is generally a smooth surface with a surface roughness of about 0.4 S or a matte surface by graining, and the reflection of light from the surface of the speaker resin diaphragm 2 produced by these molds. The state is glossy if the mold surface is smooth, and matte if the mold surface is textured, and the surface of the speaker resin diaphragm 2 has rainbow-colored gloss. In the case of adding a design feature, it is necessary to attach a hologram sheet to the surface of the speaker resin diaphragm 2 as described above, which increases the weight of the speaker resin diaphragm and increases the sound pressure of the speaker. The problem is that the sound quality characteristics change due to the problem of lowering the level, the hologram sheet and the adhesive used to attach it, and the cost of the speaker resin diaphragm that increases due to an increase in the number of manufacturing processes for attachment and an increase in cost. There was also a problem.

The present invention solves the above-mentioned problems. The surface of the diaphragm for a speaker has an iridescent luster without increasing the weight of the diaphragm, and the sound quality characteristics are not significantly changed, and the cost is low. Another object of the present invention is to provide a resin diaphragm for a speaker and a speaker using the same.

[0017]

In order to solve the above problems, the present invention has the following constitution. The invention according to claim 1 has 0.7 to 2 μm on at least one of the front surface side and the back surface side.
A diaphragm made of resin for speakers, which is provided with fine grooves or fine holes having the same pitch with a size of m, and the light illuminated on the diaphragm is fine grooves or fine holes formed on the surface of the resin product. The small holes cause a diffraction phenomenon in which the angle of the diffracted light changes according to the wavelength of the light color.At this time, grooves or minute small holes are formed with a uniform pitch, so the angle of the diffracted light is constant for each color wavelength. As a result, the colors are dispersed and rainbow-colored gloss is generated, and the colorful color effect can be obtained without attaching a hologram sheet, and there is no increase in weight, no sound pressure deterioration, and other sound quality characteristics. It is possible to provide a resin diaphragm for a speaker, which is less costly and different from the above-described resin diaphragm for a speaker.

According to the invention of claim 2 of the speaker resin diaphragm of the present invention, in the invention of claim 1, the front surface and the back surface both have the same pitch with a dimension of 0.7 to 2 μm. The resin for a speaker, which has a fine groove or a minute small hole, can generate a rainbow-colored gloss due to a light diffraction phenomenon on both front and back sides, and which is further excellent in designability than that of claim 1. The diaphragm can be provided.

According to the invention of claim 3 of the speaker resin diaphragm of the present invention, in the invention of claim 1 or 2, the depth of the groove or minute small hole is 0.1 μm or more. Accordingly, it is possible to provide a resin diaphragm for a speaker that causes a light diffraction phenomenon more reliably and stably.

According to a fourth aspect of the present invention, there is provided a resin diaphragm for a speaker according to the first to third aspects, wherein metal vapor deposition or sputtering is performed on a surface having grooves or fine small holes. The metal thin film layer is formed by the metal thin film layer, the reflectance of the surface is improved by the metal thin film layer, a stronger light diffraction phenomenon occurs, and it is possible to provide a resin diaphragm for a speaker that can enhance the visual impression. To do.

The invention according to claim 5 of the speaker of the present invention comprises a speaker using the resin diaphragm for a speaker according to any one of claims 1 to 4, and has a rainbow-colored gloss. (EN) It is possible to provide a visually emphasized speaker using a resin diaphragm for a speaker as an inexpensive speaker with little change in sound quality characteristics.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS. 1 (a) to 4 (c).

The same parts as those of the prior art are designated by the same reference numerals, and the description thereof will be omitted to explain only the difference.

(Embodiment 1) FIG. 1 (a) is a half sectional view of a speaker of the present invention, and FIG. 1 (b) is for explaining the surface state of a speaker resin diaphragm which is the main part. 2 (a) is a schematic enlarged cross-sectional view of the movable side insert, which is a main part of an injection molding die for manufacturing the resin diaphragm for the speaker, and FIG. 2 (b) is for the speaker. FIG. 4 is a schematic enlarged cross-sectional view of a surface portion of a resin diaphragm, FIG. 3 is a schematic diagram for explaining a light diffraction phenomenon, and the present embodiment mainly describes claims 1, 3, 4, and Claim 5 will be described.

According to the figure, the difference from the prior art lies in the speaker resin diaphragm, and in the speaker resin diaphragm 2a of this embodiment, the entire surface of the speaker resin diaphragm 2a is covered. The grooves 2b having a fine pitch of 0.2 μm in depth and 0.8 μm in pitch are formed.

As a result, when the speaker resin diaphragm 2a is incorporated in a speaker, when illuminated by light, it becomes iridescent reflected light, and a gloss that is extremely visually emphasized is obtained.

This will be described with reference to the schematic diagram of the light diffraction phenomenon of FIG. 3. The light diffraction phenomenon occurs due to the corner 2c of the groove 2b on the surface of the speaker resin diaphragm 2a, and the wavelength of the light causes the diffraction phenomenon. The angle of the diffracted light changes, but at this time, the groove 2b
Are formed at a uniform pitch, the angle of the diffracted light is constant for each color wavelength, and light interference does not occur. And iridescent luster is obtained.

The angle of the diffracted light when the light illuminates the surface of the speaker resin diaphragm 2a is θ = ArcSin (λ /
The angle of the diffracted light is determined by the wavelength λ of the light and the pitch P of the grooves.

The wavelength of visible light is 400 nm to 700 nm
Assuming that the pitch P of the groove is 0.7 μm or more at the minimum, the pitch of the groove needs to be about 2 μm or less at the maximum in order to obtain the spectral difference of the diffracted light at the level at which humans feel the difference in color. .

Further, in order to realize the light diffraction phenomenon accurately, it is preferable that the depth of the groove is 0.1 μm or more.

The speaker resin diaphragm 2a having the groove 2b has a ridge-shaped projection 1c with a fine pitch of 0.2 μm in height and a pitch of 0.8 μm, which is a nest 1 on the movable side of the injection molding die.
It is formed at the time of injection molding by being provided in the portion where the speaker resin diaphragm 2a of b is formed.

By forming a ridge-shaped protrusion 3c similar to the ridge-shaped protrusion 1c on the fixed side insert 3a, the same effect can be obtained on the rear surface side of the speaker resin diaphragm 2a, and the transparent Alternatively, a speaker diaphragm 2 made of a semitransparent resin is used.
When a is formed, the same effect can be brought about on the surface side.

With the above-mentioned structure, the resin diaphragm 2 for a speaker, which is inexpensive and does not increase in weight or change in sound quality characteristics, is inexpensive.
It is possible to obtain a and a speaker using the same.

In the above-mentioned embodiment, the speaker resin diaphragm is used, but the present invention can be similarly applied to other speaker parts such as a frame made of a resin molded product.

In the above embodiment, the description has been made assuming that the grooves 2b are formed in the speaker resin diaphragm 2a. However, even if minute holes having a fine pitch with equal intervals are formed, the diffraction phenomenon of light will occur. As long as the spectrum is generated by the above and rainbow-colored reflected light is obtained, it is sufficient.

In order to improve the reflection efficiency at least on the surface of the speaker resin diaphragm 2a on which the groove 2b is formed, a reflective layer is formed by vapor deposition or sputtering of metal of gold, silver, nickel, titanium, aluminum or copper. By providing the metal thin film, the effect of the present embodiment can be improved.

Any metal may be used for the metal vapor deposition as long as the above effects can be obtained.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG. 4 which is a schematic view of a movable-side insert 1b and a fixed-side insert 3b of an injection molding die of a speaker resin diaphragm. explain. The present embodiment mainly describes claim 2, and according to the figure, a height of 0.2 μm,
A fine pitch ridge-shaped projection 1c having a pitch of 0.8 μm is provided in a movable insert 1b of an injection molding die and a fixed insert 3b.
The same protrusions 3c are provided in the respective portions where the speaker resin diaphragm 2b is formed, and the speaker resin diaphragm 2b (not shown) is provided by injection molding.

Due to the ridge-shaped projections of the nests 1b and 3b, the depth of 0.
By forming grooves with a fine pitch of 2 μm and a pitch of 0.8 μm, in addition to the effect of the first embodiment, it is possible to generate iridescent luster on the back surface of the speaker resin diaphragm 2b. It is possible to obtain a speaker resin diaphragm 2b having iridescent luster on both sides and a speaker using the same.

It can be applied to other resin molded parts as in the first embodiment, and similar effects can be obtained by forming similar grooves on the side of a molded product having a large thickness.

[0041]

As described above, the speaker-made resin diaphragm of the present invention is superior to the conventional speaker-made resin diaphragm in comparison with the conventional speaker-made diaphragm.
Since it is not necessary to attach a hologram sheet, it is possible to obtain an inexpensive resin diaphragm for a speaker, which is less likely to increase in weight and change in sound quality characteristics, and a speaker using the diaphragm.

[Brief description of drawings]

FIG. 1A is a half cross-sectional view of a speaker according to an embodiment of the present invention, and FIG. 1B is a schematic enlarged cross-sectional view for explaining a surface state of a speaker resin diaphragm that is a main part of the speaker.

FIG. 2 (a) is a schematic side view of a movable side insert of an injection molding die for manufacturing the speaker resin diaphragm, and FIG. 2 (b) is a schematic enlargement of a surface portion of the speaker resin diaphragm forming portion. Cross section

FIG. 3 is a schematic diagram illustrating a light diffraction phenomenon.

FIG. 4 (a) is a schematic side view of a movable-side and fixed-side insert, which is a main part of an injection molding die for forming another speaker resin diaphragm of the present invention. (C) Enlarged view of the surface of the fixed side insert

FIG. 5 is a half sectional view of a conventional speaker

FIG. 6 is a full sectional view of a conventional injection-molding die for a resin diaphragm for a speaker.

[Explanation of symbols]

2a Resin diaphragm for speaker 2b groove 4 edges 6 frames 7 voice coil 13 Magnetic circuit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Teruo Doi             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masashi Tokumori             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Takehiro Enomoto             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5D016 AA09 BA01 BA05 BA06 CA01                       EC01

Claims (5)

[Claims] 1. A value of 0.
A resin diaphragm for a speaker, in which a plurality of grooves having a uniform pitch width of 7 to 2 μm or minute small holes are formed. 2. Both the front surface and the back surface have a surface roughness of 0.
The resin diaphragm for a speaker according to claim 1, wherein a plurality of grooves or fine small holes having a uniform pitch width of 7 to 2 μm are formed. 3. The depth of the groove or minute small hole is 0.1 μm.
The resin diaphragm for a speaker according to claim 1 or 2, which is the above. 4. The diaphragm made of a resin for a speaker according to claim 1, wherein a metal thin film is formed on the surface on which the groove or the minute small hole is formed by metal vapor deposition or sputtering. 5. A frame which is coupled to a magnetic circuit having at least a magnetic gap, and a diaphragm which is coupled around a voice coil fitted in the magnetic gap and whose outer peripheral portion is coupled to an inner periphery of an edge. A speaker using the resin diaphragm for a speaker according to any one of claims 1 to 4, wherein an outer peripheral portion of the diaphragm is connected to a peripheral edge of the frame.