JP2007288258A - Structural component for speaker apparatus and speaker apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide structural components for a speaker apparatus or the like with a material structure capable of improving the rust proof and the Young's modulus (elastic modulus). <P>SOLUTION: The structural components for the speaker apparatus are various members for configuring the speaker apparatus and includes, e.g. a frame, a voice coil bobbin, a damper, a diaphragm, an edge, a cap, and a housing or the like. The structural components for the speaker apparatus includes magnesium base materials containing magnesium or a magnesium alloy, and an electrodeposition film formed on the surface of the magnesium base materials. Thus, the surface of the magnesium base materials with an easy rusting property is protected by the electrodeposition film so as to improve the rust proof performance of the structural components for the speaker apparatus. In particular, in the structural components for the speaker apparatus, fillers with a high Young's modulus (elastic modulus) replenish the electrodeposition film. Consequently, Young's modulus of the structural components for the speaker apparatus can be enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a material of a constituent member for a speaker device.

  2. Description of the Related Art Conventionally, a speaker device that includes various speaker device components such as a diaphragm, an edge, a frame, a damper, a voice coil bobbin, a cap, and a housing is known. A magnesium diaphragm made of magnesium is known as a diaphragm that is an example of the constituent member for the speaker device. Since such a magnesium diaphragm is lightweight, has high internal loss, and has high vibration damping performance, it is suitably used for a speaker device for high frequency reproduction such as a tweeter.

  Here, since magnesium has a property of being easily oxidized as compared with aluminum and titanium, the surface of the magnesium diaphragm is usually subjected to rust prevention treatment such as anodizing treatment or electrodeposition coating treatment. Patent Documents 1 and 2 describe an example of a magnesium diaphragm having an anodic oxide film or an electrodeposition coating film (for example, an acrylic resin film) formed by such a rust prevention treatment and having a rust prevention effect.

  The speaker diaphragm described in Patent Document 1 includes a magnesium sheet or a magnesium alloy, a primer layer formed on the surface thereof and made of an epoxy resin, and an overcoat layer formed on the surface and made of an acrylic resin or the like. Become. It is said that a high rust prevention effect can be obtained by this material structure.

  The magnesium diaphragm described in Patent Document 2 is a magnesium thin plate mainly composed of magnesium, an anodized film provided on the surface thereof and dyed with a dye, and an acrylic resin provided on the surface. And an electrodeposition coating film containing as a main component. With this material configuration, it is said that the design can be improved and good rust resistance can be obtained.

  Magnesium material having an anodized film that does not change the gloss of the metal substrate on the outer surface of the magnesium or magnesium alloy product, and an electrodeposition coating film made of a colorless or colored transparent acrylic resin on the anodized film Products are known (see, for example, Patent Document 3). Due to this material structure, this magnesium material product is said to exhibit a metallic substrate gloss with little change in the gloss and color tone of the magnesium material substrate, or to have extremely excellent rust resistance.

JP 2002-369284 A JP 2005-72641 A Japanese Patent Laid-Open No. 11-236698

  However, as described above, the electrodeposition coating film using an acrylic resin has a low Young's modulus (elastic modulus), and accordingly, there is a problem in that the Young's modulus of the speaker device constituent member is lowered. For example, when such a material structure is applied to a diaphragm as an example of a structural member for a speaker device, the natural frequency of the diaphragm is lowered, and a desired mid-high range characteristic cannot be obtained in the speaker device. There is a fear.

  Examples of problems to be solved by the present invention include the above. An object of the present invention is to provide a speaker device component having a material structure capable of improving rust resistance and Young's modulus (elastic modulus), a speaker device using the same, and the like.

  The invention according to claim 1 is a component for a speaker device, comprising: a magnesium-based material made of magnesium or a magnesium alloy; and an electrodeposition coating film formed on a surface of the magnesium-based material. The coating film is filled with a filler.

  The invention according to claim 2 is a structural member for a speaker device, comprising a magnesium-based material made of magnesium or a magnesium alloy, an anodized film or a chemical conversion film formed on the surface of the magnesium-based material, and the anode An electrodeposition coating film formed on the surface of the oxide film or the chemical conversion coating, and the electrodeposition coating film is filled with a filler.

  In one embodiment of the present invention, a component for a speaker device includes a magnesium-based material made of magnesium or a magnesium alloy, and an electrodeposition coating film formed on a surface of the magnesium-based material, and the electrodeposition coating. The film is filled with a filler.

  The constituent member for a speaker device includes a magnesium-based material made of magnesium or a magnesium alloy, and an electrodeposition coating film formed on the surface of the magnesium-based material. Here, examples of the constituent member for the speaker device include a frame, a voice coil bobbin, a damper, a diaphragm, an edge, a cap, and a housing. Thus, in this component for a speaker device, since the electrodeposition coating film that functions as a rust-proofing film is formed on the surface of the magnesium-based material, the surface of the magnesium-based material having the property of being easily rusted is electrodeposition-coated. It is protected by the film, and the rust resistance of the speaker device component can be improved.

  In particular, in this structural member for a speaker device, since the electrodeposition coating film is filled with a filler (reinforcing material), the Young's modulus (elastic modulus) of the structural member for the speaker device can be improved. In addition, in the above-mentioned component for a speaker device, an optimum balance between rust prevention and Young's modulus (elastic modulus) should be achieved by appropriately changing the amount of filler filled in the electrodeposition coating as necessary. Can do.

  In addition, when the above-described material structure is applied to a diaphragm as an example of a component for a speaker device, the natural frequency of the diaphragm can be increased and the middle and high frequency range characteristics of the speaker device can be improved. And the desired mid-high range characteristics can be obtained.

  In a preferred example, the electrodeposition coating film is preferably formed of an acrylic resin, an epoxy resin, or the like, and the filler is a material having a high Young's modulus (elastic modulus), for example, a metal oxide such as alumina. It is preferable to be formed of a material containing any one of a metal, a heavy metal such as tungsten, a nitride such as aluminum nitride and boron nitride, and a silicate such as talc. Alternatively, the electrodeposition coating film is formed by a cationic electrodeposition coating having an epoxy resin skeleton having a sulfonium group as a cation group and a propargyl group as a reactive group. The filler is preferably made of a material having a high Young's modulus (elastic modulus), for example, a metal oxide such as alumina, a heavy metal such as tungsten, a nitride such as aluminum nitride or boron nitride, and a silica such as talc. It is preferable that it is formed of a material containing any of the acid salts. In addition, the filler filling amount can be set to an amount by which a desired Young's modulus (elastic modulus) can be obtained according to the target performance of the speaker device component, for example, 0.1 wt% to 50 wt%. Preferably it is set. If the amount is less than 0.1 wt%, a significant improvement in Young's modulus of the speaker device component cannot be expected, and if it exceeds 50 wt%, the weight of the speaker device component increases and the rust resistance decreases greatly. This is because it is not practical.

  In another embodiment of the present invention, the speaker device component includes a magnesium-based material made of magnesium or a magnesium alloy, an anodized film or chemical conversion film formed on the surface of the magnesium-based material, and the anodized film. Or the electrodeposition coating film formed in the surface of the said chemical conversion treatment film, and the said electrodeposition coating film is filled with the filler.

  The speaker device component includes a magnesium-based material made of magnesium or a magnesium alloy, an anodized film or a chemical conversion film formed on the surface of the magnesium-based material, and a surface of the anodized film or the chemical conversion film. And an electrodeposition coating film formed on the substrate. Here, examples of the constituent member for the speaker device include a frame, a voice coil bobbin, a damper, a diaphragm, an edge, a cap, and a housing. Thus, in this component for a speaker device, an anodized film or a chemical conversion film that functions as a rust-proofing film is formed on the surface of the magnesium-based material, and further, on the surface of the anodized film or the chemical conversion film Since the electrodeposition coating film that functions as a rust preventive film is formed, the surface of the magnesium-based material having the property of being easily rusted is protected in an overlapping manner by the anodized film or the chemical conversion film and the electrodeposition coating film, Furthermore, the rust resistance of the speaker device component can be improved.

  In particular, in this structural member for a speaker device, since the electrodeposition coating film is filled with a filler (reinforcing material), the Young's modulus (elastic modulus) of the structural member for the speaker device can be improved. In addition, in the above-mentioned component for a speaker device, an optimum balance between rust prevention and Young's modulus (elastic modulus) should be achieved by appropriately changing the amount of filler filled in the electrodeposition coating as necessary. Can do.

  In addition, when the above-described material structure is applied to a diaphragm as an example of a component for a speaker device, the natural frequency of the diaphragm can be increased and the middle and high frequency range characteristics of the speaker device can be improved. And the desired mid-high range characteristics can be obtained.

  In a preferred example, the electrodeposition coating film is preferably formed of an acrylic resin, an epoxy resin, or the like, and the filler is a material having a high Young's modulus (elastic modulus), for example, a metal oxide such as alumina. It is preferable that it is made of a material containing any one of a metal, a heavy metal such as tungsten, a nitride such as aluminum nitride and boron nitride, and a silicate such as talc. Alternatively, the electrodeposition coating film is preferably formed of a cationic electrodeposition coating having an epoxy resin having a sulfonium group as a cationic group and a propargyl group as a reactive group, and the filler is made of a high Young A material having a modulus (elastic modulus), for example, a metal oxide such as alumina, a heavy metal such as tungsten, a nitride such as aluminum nitride or boron nitride, or a silicate such as talc. It is preferable. In addition, the filler filling amount can be set to an amount by which a desired Young's modulus (elastic modulus) can be obtained according to the target performance of the speaker device component, for example, 0.1 wt% to 50 wt%. Preferably it is set. If the amount is less than 0.1 wt%, a significant improvement in Young's modulus of the speaker device component cannot be expected, and if it exceeds 50 wt%, the weight of the speaker device component increases and the rust resistance decreases greatly. This is because it is not practical.

  In still another embodiment of the present invention, a speaker device including the above-described speaker device constituent member can be configured. In particular, in the case of a vehicle-mounted speaker device used in a harsh environment, high rust resistance is required, but by applying a speaker device component having the above material structure to a vehicle-mounted speaker device, Such a requirement can be met.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of components for speaker device]
FIG. 1 is a cross-sectional view of a speaker device 100 including a speaker device component according to the present invention, cut along a plane passing through its central axis.

  As shown in FIG. 1, the speaker device 100 includes a speaker unit 50 and a housing 51 that houses the speaker unit 50. In the present invention, the configuration and driving method of the speaker device and the shape, position, size, and the like of the speaker device component are not limited to the configurations described below.

  The speaker unit 50 further includes a magnetic circuit system and a vibration system. The magnetic circuit system has a yoke 1 including a cylindrical pole portion 1a and a flange portion 1b extending outward from the lower end of the outer peripheral wall of the pole portion 1a, and an annular shape attached on the flange portion 1b. A magnet 2 and an annular plate 3 attached on the magnet 2; The vibration system includes a voice coil bobbin 4, a voice coil 5 wound around the lower end portion of the outer peripheral wall of the voice coil bobbin 4, a damper 6, a diaphragm 7, a frame 8, an edge 9, and a cap 10. is doing.

  In the speaker device 100 having such a configuration, in the present invention, in particular, the material of the constituent members for the speaker device such as the frame 8, the voice coil bobbin 4, the damper 6, the diaphragm 7, the edge 9, the cap 10, and the housing 51 is used. It has characteristics in structure.

  First, with reference to FIG. 1, the structure of the structural member for speaker apparatuses used as the application object of this invention is demonstrated, and the structure of the raw material is demonstrated with reference to FIG.

  The frame 8 is a member having a substantially cup shape and a function of supporting various components constituting the speaker unit 50. The lower end of the frame 8 is attached on the plate 3.

  The voice coil bobbin 4 is a member having a function of fixing the voice coil 5 at a predetermined position, vibrating with the voice coil 5 in accordance with a voice input signal, and transmitting the vibration to the diaphragm 7. The voice coil bobbin 4 has a cylindrical shape, and is provided at a position covering the vicinity of the upper end portion of the outer peripheral wall of the pole portion 1 a that is an element of the yoke 1.

  The damper 6 is a member that elastically supports the voice coil bobbin 4. The damper 6 has an annular shape and is formed with a plurality of concentric waveform shapes (corrugations). The inner peripheral edge of the damper 6 is attached to the outer peripheral wall of the voice coil bobbin 4, while the outer peripheral edge of the damper 6 is attached to an appropriate position of the frame 8.

  The diaphragm 7 is a member having a function of radiating a sound wave corresponding to a voice input signal. The diaphragm 7 has a cone shape. The inner peripheral edge of the diaphragm 7 is attached to the upper end of the outer peripheral wall of the voice coil bobbin 4, while the outer peripheral edge of the diaphragm 7 is attached to an appropriate position of the edge 9.

  The edge 9 is a member that has an annular shape and has a function of absorbing unnecessary vibration generated in the diaphragm 7. The inner peripheral edge of the edge 9 is attached to the outer peripheral edge of the diaphragm 7, while the outer peripheral edge of the edge 9 is attached to an appropriate position of the frame 8.

  The cap 10 is a member having a dome shape and a function of preventing dust and the like from entering the speaker unit 50. The cap 10 is disposed at a position covering the upper surface side of the voice coil bobbin 4.

  The housing 51 is a member having a function of housing and fixing the speaker unit 50.

  Next, with reference to FIG. 2, the structure of the material of the structural member for the speaker device that characterizes the present invention will be described.

  FIG. 2A is an enlarged cross-sectional view of a main part of a structural member for a speaker device having a first material structure to which the present invention is applied. On the other hand, FIG.2 (b) is a principal part expanded sectional view of the structural member for speaker apparatuses which has the 2nd material structure used as the application object of this invention.

  As described above, since magnesium is easily oxidized due to its nature, an anodic oxide film that functions as a rust-proofing film is usually formed on its surface as a countermeasure for preventing the occurrence of such oxidation. Furthermore, an electrodeposition coating film made of an acrylic resin and functioning as a rust-proofing film may be formed on the surface of the anodized film. Thereby, the improvement of rust prevention property can be aimed at. However, as described above, since the electrodeposition coating film using an acrylic resin has a low Young's modulus (elastic modulus), there is a problem in that the Young's modulus of the structural member for the speaker device is reduced accordingly. . For example, when such a material structure is applied to a diaphragm as an example of a structural member for a speaker device, the natural frequency of the diaphragm is lowered, and a desired mid-high range characteristic cannot be obtained in the speaker device. There is a fear.

  Therefore, in the structural member for a speaker device to which the present invention is applied, in order to improve such a problem, the electrodeposition coating film is filled with a filler (reinforcing material) having a high Young's modulus (elastic modulus).

  Specifically, as shown in FIG. 2 (a), a speaker device component having a first material structure to which the present invention is applied includes a magnesium-based material 70 made of magnesium or a magnesium alloy, and a magnesium-based material. An electrodeposition coating film 73 formed on the surface of the material 70 and functioning as a rust-proofing film, and the electrodeposition coating film 73 is filled with a filler 75. On the other hand, the speaker device component having the second material structure to which the present invention is applied includes a magnesium-based material 70 made of magnesium or a magnesium alloy, and a magnesium-based material 70 as shown in FIG. An anodized film 71 or chemical conversion film 72 that is formed on the surface and functions as a rust preventive film, and an electrodeposition coating film 73 that is formed on the surface of the anodized film 71 or chemical conversion film 72 and functions as a rust preventive film. The electrodeposition coating film 73 is filled with a filler 75.

  For example, as a specific example, a diaphragm 7 as a component for a speaker device is formed on a magnesium alloy foil (magnesium-based material 70) having a thickness of 0.05 mm and the surface of the magnesium alloy foil. A 0.001 mm anodic oxide film 71 and an electrodeposition coating film 73 formed on the surface of the anodic oxide film 71 and having a thickness of 0.006 mm. The electrodeposition coating film 73 has a filler 75 of about 10 wt. It can be set as the structure filled about%.

  In a preferred example, the electrodeposition coating 73 is preferably formed of an acrylic resin, an epoxy resin, or the like. The electrodeposition coating film 73 is preferably formed of a cationic electrodeposition paint having an epoxy resin as a skeleton, each having a sulfonium group as a cationic group and a propargyl group as a reactive group. The filler 75 is made of a material having a high Young's modulus (elastic modulus), for example, a metal oxide such as alumina, a heavy metal such as tungsten, a nitride such as aluminum nitride or boron nitride, or a silicate such as talc. It is preferable that it is formed of a material containing any of these. Alternatively, the filling amount of the filler 75 can be set to an amount at which a desired Young's modulus (elastic modulus) can be obtained in the speaker device component according to the target performance, for example, about 0.1 wt% to about It is preferably set to 50 wt%. If the amount is less than 0.1 wt%, a significant improvement in Young's modulus of the speaker device component cannot be expected, and if it exceeds 50 wt%, the weight of the speaker device component increases and the rust resistance decreases greatly. This is because it is not practical. In the present invention, each thickness of the magnesium-based material 70, the anodized film 71, the chemical conversion film 72, and the electrodeposition coating film 73 is not limited, and the shape and size of the filler 75 are not limited. .

  In the component member for a speaker device having the above first and second material structures, the electrodeposition coating film 73 is filled with the filler 75 (reinforcing material) having a high Young's modulus (elastic modulus), so that it is for the speaker device. The Young's modulus (elastic modulus) of the constituent member can be improved. Further, in this embodiment, an optimal balance between rust prevention and Young's modulus (elastic modulus) can be achieved by appropriately changing the amount of the filler 75 filled in the electrodeposition coating film 73 as necessary.

  In addition, when the above-described material structure is applied to the diaphragm 7 as a component for the speaker device, the natural frequency of the diaphragm 7 can be increased, and the middle and high frequency range characteristics of the speaker device 100 can be improved. And the desired mid-high range characteristics can be obtained.

  With respect to this point, the characteristics of a diaphragm as an example of a speaker device component to which the material structure of the present invention is applied will be described with reference to FIG.

FIG. 3 shows the density ρ [g / cm ³ ], Young's modulus (elastic modulus) E [× 10 ¹⁰ N / m ² ], internal loss, in each of the diaphragms of Comparative Example 1, Comparative Example 2, and this example. specific modulus E / [rho is a chart comparing the physical properties of ^{[× 10 7 m 2 / s} 2].

  Here, Comparative Example 1 includes a magnesium-based material, an anodized film formed on the surface thereof, and an electrodeposition coating film formed on the surface of the anodized film and made of an acrylic resin. The coating film has a structure in which no filler is filled. Comparative Example 2 includes a magnesium-based material, an anodized film formed on the surface thereof, and an electrodeposition-coated film formed on the surface of the anodized film and made of an epoxy-based resin. Has a structure in which no filler is filled. The present example comprises a magnesium-based material, an anodized film formed on the surface thereof, and an electrodeposition coating film formed on the surface of the anodized film and made of an epoxy resin, and the electrodeposition coating film Has a structure filled with about 10 wt% of filler.

  Generally, the diaphragm is required to have a large Young's modulus E and specific elastic modulus E / ρ in order to expand the piston motion region, and to have a large internal loss in order to smooth the frequency characteristics. . In this regard, as is apparent from FIG. 3, the diaphragm according to the present example has larger physical property values of Young's modulus E and specific elastic modulus E / ρ than the diaphragms according to Comparative Examples 1 and 2. I understand that. The magnitude of the internal loss is approximately the same in the diaphragm according to this example and Comparative Examples 1 and 2. That is, it can be seen from this experimental result that a diaphragm having a high Young's modulus E and a specific elastic modulus E / ρ can be obtained by filling the electrodeposition coating film with a filler having a high Young's modulus (elastic modulus). In particular, the remarkable effect of the present invention can be expected by applying such a material structure to a thin and light diaphragm for reproducing a high sound range. As a result, as described at the beginning, the natural frequency of the diaphragm can be increased, the mid-high range characteristics of the speaker device can be improved, and the desired mid-high range characteristics can be obtained.

  Moreover, in the structural member for a speaker device having the first material structure, since the electrodeposition coating film 73 functioning as a rust-proofing film is formed on the surface of the magnesium-based material 70, the magnesium-based material having the property of being easily rusted. The surface of 70 is protected by the electrodeposition coating 73, and the rust resistance of the speaker device component can be improved. In addition, in the component member for a speaker device having the second material structure, in addition to the first material structure, an electrodeposition coating film 73 that further functions as a rust-proofing film is provided on the surface of the anodized film 71 or the chemical conversion film 72. Since it is formed, the surface of the magnesium-based material 70 having the property of being easily rusted is protected in a superimposed manner by the anodized film 71 or the chemical conversion film 72 and the electrodeposition coating film 73, and compared with the first material structure. Thus, the rust resistance of the speaker device constituent member can be further improved.

  As described above, by applying the material structure of the present invention to the structural member for the speaker device, the rust resistance of the structural member for the speaker device can be improved. In particular, the diaphragm as an example of the structural member for the speaker device Then, improvement in rust resistance and Young's modulus (elastic modulus) can be achieved. In particular, in the case of a vehicle-mounted speaker device used in a harsh environment, high rust resistance is required, but by applying the speaker device component having the material structure of the present invention to the vehicle-mounted speaker device. Can meet such requirements.

[Manufacturing method of speaker device component]
Next, with reference to FIG. 4 and FIG. 5 etc., the manufacturing method of the above-mentioned structural member for the speaker device to which the present invention is applied will be described. FIG. 4 is a flowchart showing a method for manufacturing a speaker device component to which the present invention is applied. FIG. 5 shows a rolling process diagram corresponding to the rolling process P1 in FIG.

  First, a magnesium-based material 70x made of magnesium or a magnesium alloy is rolled to a desired thickness by a rolling process 200 to obtain a sheet-like magnesium-based sheet 24 having a predetermined thickness (rolling process P1).

  Specifically, first, as shown in FIG. 5, a magnesium-based material 70 x having a predetermined thickness is rolled to a desired thickness by a rolling process 200. For example, the magnesium-based material 70x is formed as a sheet material having a predetermined thickness and a thickness of about 150 μm in advance. In the rolling process 200, the magnesium-based material 70x is rolled a plurality of times by the rolling mill 23, whereby the magnesium-based sheet 24 having a predetermined thickness is manufactured (arrow s6).

  The rolling mill 23 rolls the magnesium-based material 70x to a predetermined thickness while applying a certain tension while rotating in a certain direction, and the magnesium-based material 70x at a predetermined temperature ( For example, the thermostat 22 is heated to about 300 ° C.

  The rolling rollers 21a, 21b, 21c, and 21d can be adjusted to a constant tension through a tension adjusting mechanism (not shown). The tension adjustment mechanism is adjusted to a constant tension by an operator or the like operating the operation panel. In this example, the rolling rollers 21a, 21b, 21c, and 21d can thin the magnesium-based material 70 within a range of about 1 to 20 μm by each rolling.

  The thermostat 22 is a device for heating the magnesium-based material 70x to a predetermined temperature, and the inside is controlled to a constant temperature by a temperature controller (not shown). Since magnesium is a close-packed hexagonal crystal, it is difficult to process at room temperature. For this reason, it rolls, heating to about 200-400 degreeC with the thermostat 22 normally, Preferably it is about 300 degreeC. As a result, the magnesium-based material 70x that is difficult to be plastically deformed is easily rolled.

  Explaining the process flow of the rolling process 200, first, the magnesium-based material 70x having a certain thickness is sent to the rolling mill 23 by an unillustrated delivery device (arrow s1). Next, while the pair of rolling rollers 21a and 21b rotate in a certain direction (arrows s2 and s3), the magnesium-based material 70x is rolled to a predetermined thickness, and the magnesium-based material 70x is moved into the thermostatic chamber 22. Send it out. The magnesium-based material 70x is heated to a predetermined temperature while passing through the thermostatic chamber 22, and is easily plastically deformed. Next, when the magnesium-based material 70x is sent from the thermostatic chamber 22 to the pair of rolling rollers 21c and 21d, the pair of rolling rollers 21c and 21d rotate in a certain direction (arrows s4 and s5), while the magnesium-based material Roll 70x again. Through the above rolling process 200, the magnesium-based material 70x finally becomes the magnesium-based sheet 24 having a thickness of 50 μm (arrow s6).

  In this example, as described above, when the magnesium-based material 70x is rolled, the rolling amount for each time is set in a range of about 1 to 20 μm, for the following reason. That is, the magnesium-based material 70x is a material that hardly undergoes plastic deformation because the amount of slip deformation is very small compared to other metals. For this reason, if the rolling amount to be rolled at one time is increased too much, defects such as cracks, warpage, or pinholes occur in the magnesium-based material 70x due to the influence of residual strain latent in the magnesium-based material 70x, and the yield increases. Leading to a decline. Therefore, in this example, the rolling amount per one time is reduced to about 1 to 20 μm, and the magnesium-based material 70x is rolled a plurality of times, so that the above problems are solved and the yield is improved.

  Next, an example of a rolling method when rolling the magnesium-based material 70x by the rolling process 200 will be described with reference to a table shown in FIG. FIG. 6 is a chart showing an example of a rolling method when rolling the magnesium-based material 70x to a thickness of 150 μm → 50 μm.

  In the example of the rolling method shown in FIG. 6, the magnesium-based material 70x having a thickness of 150 μm in the initial state is finally obtained through a two-step process of 150 μm → 80 μm and 80 μm → 50 μm. Say it.

  In the first step of changing from 150 μm to 80 μm, the rolling amount of the magnesium-based material 70 x for each time is set to 5 μm, and the magnesium-based material 70 x is repeatedly rolled 14 times by the rolling mill 23. Thereby, the magnesium-based material 70x has a thickness of 80 μm.

  In the next step of 80 μm → 50 μm, the rolling amount of the magnesium-based material 70x for each time is set to 3 μm, and the magnesium-based material 70x is repeatedly rolled 10 times by the rolling mill 23. Thereby, the magnesium-based material 70x has a thickness of 50 μm.

  As described above, in the example of the rolling method shown in FIG. 6, the magnesium-based sheet 24 having a thickness of 50 μm is finally obtained by rolling the magnesium-based material 70 x a total of 24 times with different rolling amounts.

  In addition, the example of the rolling method shown in FIG. 6 shows an example to the last, and the rolling method, the rolling amount for each time, the thickness of the magnesium-based sheet 24, and the like are not limited thereto.

  Next, returning to FIG. 4, the obtained magnesium-based sheet 24 is formed by a known forming method in the forming step P2, and for example, the frame 8, the voice coil bobbin 4, the damper 6, the diaphragm 7, the edge shown in FIG. 9. Obtain speaker device components such as the cap 10 and the casing 51.

  Next, as shown in FIGS. 4 and 2A, the surface of the obtained component for speaker device is subjected to, for example, a cationic electrodeposition coating treatment, and the surface of the magnesium-based sheet 24 is highly elastic. The electrodeposition coating film 73 including the filler 75 having a rate is formed to a predetermined thickness (for example, a thickness of about 6 μm) (electrodeposition coating process P3). Here, as a material for forming the electrodeposition coating 73, an acrylic resin, an epoxy resin, or the like is preferable. The material for forming the electrodeposition coating 73 is preferably a cationic electrodeposition paint having an epoxy resin skeleton having a sulfonium group as a cationic group and a propargyl group as a reactive group. The filler 75 is made of a material having a high Young's modulus (elastic modulus), for example, a metal oxide such as alumina, a heavy metal such as tungsten, a nitride such as aluminum nitride or boron nitride, or a silicate such as talc. It is preferable that it is formed of a material containing any of these. Alternatively, the filling amount of the filler 75 can be set to an amount at which a desired Young's modulus (elastic modulus) can be obtained in the speaker device component according to the target performance, for example, about 0.1 wt% to about It is preferably set to 50 wt%. If the amount is less than 0.1 wt%, a significant improvement in Young's modulus of the speaker device component cannot be expected, and if it exceeds 50 wt%, the weight of the speaker device component increases and the rust resistance decreases greatly. This is because it is not practical. Further, in this step, in the above-described component for a speaker device, the amount of the filler 75 filled in the electrodeposition coating 73 is appropriately changed as necessary, so that the rust prevention property and Young's modulus (elastic modulus) are obtained. An optimal balance can be achieved. In this way, the speaker device constituent member having the first material structure shown in FIG.

  Further, in the present invention, the chemical conversion treatment step P4 or the anodizing treatment step P4 is provided between the molding step P2 and the electrodeposition coating step P3, and the chemical conversion treatment step P4 or the anodizing treatment step P4 is performed. The component member for a speaker device having the second material structure can be manufactured.

  Specifically, as shown in FIG. 4 and FIG. 2 (b), the surface of the speaker device constituent member obtained in the molding step P 2 is subjected to chemical conversion treatment or anodizing treatment to form the surface of the magnesium-based sheet 24. Then, the chemical conversion film 72 or the anodic oxide film 71 is formed to a predetermined thickness (for example, a thickness of about 1 μm) (chemical conversion process P4 or anodization process P4). In the present invention, various known methods can be applied as the method of chemical conversion treatment or anodizing treatment.

  Next, the above-described electrodeposition coating process P3 is performed. Thereby, the electrodeposition coating film 73 containing the filler 75 having a high elastic modulus is formed on the surface of the chemical conversion treatment film 72 or the anodized film 71 formed on the surface of the magnesium-based sheet 24 with a predetermined thickness (for example, about 6 μm). Thickness) (electrodeposition coating step P3). In this way, the speaker device constituent member having the second material structure shown in FIG.

  The speaker device constituent member having the first and second material structures manufactured by the manufacturing method described above can obtain the above-described effects of the present invention.

It is sectional drawing which shows the structure of the speaker apparatus containing the structural member for speaker apparatuses of this invention. It is a principal part expanded sectional view which expands and shows the cross-section of the structural member for speaker apparatuses which has the 1st or 2nd raw material structure of this invention. It is a graph which shows an example of the physical-property value of the said diaphragm when this invention is applied to a diaphragm. It is a flowchart which shows the manufacturing method of the structural member for speaker apparatuses of this invention. It is a rolling process figure which shows an example of the rolling process in FIG. It is a chart which shows an example of the rolling method of a magnesium-type raw material.

Explanation of symbols

4 Voice coil bobbin 6 Damper 7 Diaphragm 8 Frame 9 Edge 10 Cap 50 Speaker unit 51 Housing 70, 70x Magnesium-based material 71 Anodized film 72 Chemical conversion film 73 Electrodeposition coating film 100 Speaker device

Claims (6)

A magnesium-based material made of magnesium or a magnesium alloy;
An electrodeposition coating film formed on the surface of the magnesium-based material,
A component for a speaker device, wherein the electrodeposition coating film is filled with a filler. A magnesium-based material made of magnesium or a magnesium alloy;
Anodized film or chemical conversion film formed on the surface of the magnesium-based material;
An electrodeposition coating film formed on the surface of the anodized film or the chemical conversion film,
A component for a speaker device, wherein the electrodeposition coating film is filled with a filler. The electrodeposition coating film is formed of an acrylic resin or an epoxy resin,
3. The speaker device component according to claim 1, wherein the filler is made of a material containing any one of metal oxide, heavy metal, nitride, and silicate. The electrodeposition coating film is formed of a cationic electrodeposition paint having an epoxy resin skeleton having a sulfonium group as a cationic group and a propargyl group as a reactive group,
3. The speaker device component according to claim 1, wherein the filler is made of a material containing any one of metal oxide, heavy metal, nitride, and silicate.   The constituent amount for a speaker device according to claim 1 or 2, wherein a filling amount of the filler is set to 0.1 wt% to 50 wt%.   A speaker device comprising the speaker device constituent member according to claim 1.

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