JP2008034909A - Component member for speaker instrument and speaker instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a component member, or the like for a speaker instrument capable of improving corrosion resistance, heat resistance, or the like. <P>SOLUTION: The component member for a speaker instrument is formed by a magnesium-based material, where calcium is added to magnesium or a magnesium alloy. In this case, the component member for a speaker instrument includes a frame, a voice coil bobbin, a damper, a diaphragm, an edge, a cap, a casing, and the like. In a preferable example, preferably, the amount of addition of calcium to the magnesium or the magnesium alloy is 0.1-50 wt.%, thus covering the surface of the magnesium-based material with a dense and smooth calcium oxide film. Therefore, the component member for a speaker instrument interrupts the connection to oxygen in the air and hence does not become rusty and burn easily. As a result, the corrosion resistance and heat resistance can be improved as compared with a material made of a magnesium single body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

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

  In general, a speaker device is configured by various speaker device components such as a diaphragm, an edge, a frame, a damper, a voice coil bobbin, a cap, and a housing. As such a speaker device component, a magnesium diaphragm made of magnesium is known. Since such a magnesium diaphragm has characteristics such as light weight and high internal loss, it is suitably used for a speaker device for high frequency reproduction such as a tweeter.

  In addition, since magnesium has a property of being easily oxidized, the surface of the magnesium diaphragm is usually subjected to moisture-proofing treatment such as anodizing treatment or electrodeposition coating treatment. Thereby, there exists an advantage that the corrosion resistance of a magnesium diaphragm can be aimed at.

  For example, Patent Documents 1 and 2 describe an example of a magnesium diaphragm formed by forming an anodized film or an electrodeposition coating film (for example, an acrylic resin film) on the surface of a magnesium material for such purposes. Yes.

JP 2005-072641 A Japanese Patent Laid-Open No. 11-236698

  However, since the electrodeposition coating film made of the acrylic resin has a low Young's modulus, when such an electrodeposition coating film is formed on the surface of the magnesium diaphragm, the Young's modulus of the diaphragm is reduced. There is a problem of end.

  Examples of problems to be solved by the present invention include the above. It is an object of the present invention to provide a speaker device constituent member and a speaker device capable of improving corrosion resistance, heat resistance, and the like.

  The invention according to claim 1 is a structural member for a speaker device, characterized in that it is formed of a magnesium-based material obtained by adding calcium to magnesium or a magnesium alloy.

  In one embodiment of the present invention, the speaker device component is formed of a magnesium-based material obtained by adding calcium to magnesium or a magnesium alloy.

  The above-described speaker device component is formed of a magnesium-based material obtained by adding calcium to magnesium or a magnesium alloy. Here, the structural member for the speaker device can be a frame, a voice coil bobbin, a damper, a diaphragm, an edge, a cap, a housing, and the like. In a preferred example, the amount of calcium added to magnesium or a magnesium alloy is preferably 0.1 wt% (wt%) to 50 wt% (wt%).

  For this reason, the surface of the magnesium-based material is covered with a dense and smooth calcium oxide film.

  With such a material structure, the structural member for a speaker device made of a magnesium-based material is not easily rusted because the connection with oxygen in the atmosphere is blocked. As a result, the corrosion resistance can be improved as compared with a material made of magnesium alone.

  In this regard, in practice, a magnesium-based material (Comparative Example 1) made of the magnesium alloy AZ31 and the above-mentioned component for a speaker device made of the magnesium-based material are used, and salt water is applied to a certain range of both of them. As a result of the test for spraying, the above-mentioned structural member for a speaker device has fewer corroded portions in a certain range than the comparative example 1, and the progress rate of rusting is about 1/3 or less. I was able to suppress it.

  Further, with this material structure, the structural member for the speaker device made of a magnesium-based material is not easily burned because the connection with oxygen in the atmosphere is blocked. Therefore, heat resistance can be improved as compared with a material made of magnesium alone. As a result, a larger input audio signal can be supplied from the amplifier side to the speaker unit that is a component of the speaker device, and safety related to heat resistance and the like of the speaker unit can be improved. it can.

  In this regard, when the ignition temperature was actually measured using a magnesium-based material (Comparative Example 2) made of a magnesium alloy and the above-mentioned structural member for a speaker device made of the magnesium-based material, the above-mentioned configuration for a speaker device was obtained. The member was able to raise the ignition temperature by about 200 to 300 ° C. relative to Comparative Example 2.

  In addition, since the corrosion resistance can be improved as described above, a thin film such as a resin-based electrodeposition coating film or the like is not required to be formed on the surface of the magnesium-based material. The Young's modulus of the structural member for the speaker device can be improved. Therefore, when the speaker device component is a diaphragm, a thin and light diaphragm for high-frequency range reproduction can be configured. As a result, the natural frequency of the diaphragm can be increased, and the frequency characteristics of the mid-high range in the speaker device can be improved.

  In one aspect of the above-described speaker device constituent member, a film is formed on the surface of the magnesium-based material. Thereby, improvement of corrosion resistance, heat resistance, etc. can be aimed at further. In particular, in this aspect, since the corrosion resistance of the magnesium-based material itself is improved, it is possible to reduce the amount of film formed on the surface of the magnesium-based material in the surface treatment process. Cost can be reduced.

  In another aspect of the structural member for a speaker device described above, the film is a film formed of any one or a combination of a chemical conversion film, an anodized film, an electrodeposition coating film, a spray coating film, a sputtering film, and a plating film. Is preferred. Thereby, the designability etc. of the structural member for speaker apparatuses can also be improved. In particular, in this aspect, since the corrosion resistance of the magnesium-based material itself is improved, it is possible to reduce the amount of the electrodeposition coating film applied to the surface of the film in the electrodeposition coating treatment process. The cost of the structural component can be reduced.

  In another embodiment of the present invention, a speaker device including the above-described speaker device component can be configured.

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

[Configuration of speaker device]
FIG. 1 shows a cross-sectional view of a speaker device 100 including a speaker device constituent member according to an embodiment of the present invention, taken along a plane passing through the central axis L1.

  As shown in FIG. 1, the speaker device 100 includes a speaker unit 50 and a casing 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 includes a magnetic circuit and a vibration system member.

  The magnetic circuit has a yoke 1 including a columnar 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; A magnetic gap 30 where the magnetic flux of the magnet 2 is concentrated is formed between the pole portion 1 a and the plate 3.

  The vibration system members include a voice coil bobbin 4, a voice coil 5, a damper 6, a diaphragm 7, a frame 8, an edge 9, and a cap 10.

  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 an 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 voice coil 5 has a pair of plus and minus lead wires (not shown) and is wound around the lower end of the outer peripheral wall of the voice coil bobbin 4. For this reason, the voice coil 5 is disposed in the magnetic gap 30. Here, the plus lead wire is an input wiring for an L (or R) channel signal, and the minus lead wire is an input wiring for a ground (GND: ground) signal. Each lead wire is electrically connected to a pair of plus and minus tinsel wires (not shown), and each tinsel wire is a speaker device terminal (not shown) provided at an appropriate position of the frame 8. Are electrically connected to each other. Note that the speaker device terminal is also electrically connected to a pair of positive and negative output wirings on the amplifier side. As a result, a signal and power (hereinafter also simply referred to as “voice current”) for one channel are input to the voice coil 5 from the amplifier side.

  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 cone shape and a function of emitting a sound wave according to an input signal. 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.

  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 9.

  The cap 10 has a dome shape and has a function of preventing dust and the like from entering the speaker unit 50. The cap 10 is attached to the sound emitting surface side of the diaphragm 7 in a state where 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.

  In the speaker device 100 having the above configuration, the audio current output from the amplifier side is transmitted through the speaker device terminal, the pair of plus and minus tinsel wires, and the pair of plus and minus lead wires of the voice coil 5. Are input to the voice coil 5. Thereby, based on Fleming's left-hand rule, a driving force is generated in the voice coil 5 within the magnetic gap 30, and the diaphragm 7 is vibrated in the direction of the central axis L <b> 1 of the speaker device 100. Thereby, sound waves are radiated through the diaphragm 7 in the direction of the arrow Y1.

(Material structure of components for speaker devices)
In the speaker device 100 having the above-described configuration, in the present invention, in particular, the material structure of the speaker device constituent members 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. Hereinafter, the material structure of the structural member for the speaker device will be described.

  In general, magnesium is easy to oxidize, has a difficulty in corrosion resistance, and easily ignites.

  In this respect, the structural member for a speaker device according to the embodiment of the present invention is formed of a magnesium-based material 70 obtained by adding calcium to magnesium or a magnesium alloy, as shown in FIG. Make a structure. In a preferred example, the amount of calcium added to the magnesium or magnesium alloy is preferably about 0.1 to about 50 wt% (wt%).

  For this reason, the surface of the magnesium-based material 70 is covered with a dense and smooth calcium oxide film.

  With such a material structure, the magnesium-based material 70 is not easily rusted because the connection with oxygen in the atmosphere is blocked. As a result, the corrosion resistance can be improved as compared with a material made of magnesium alone.

  In this regard, actually, the magnesium-based material (Comparative Example 1) made of the magnesium alloy AZ31 and the magnesium-based material 70 according to the present embodiment are used, and salt water is sprayed on a portion of a certain range of both. As a result of the test, in this example, compared with Comparative Example 1, the number of corrosion portions in the certain range was small, and the progress rate of rusting could be suppressed to about 1/3 or less.

  In addition, due to such a material structure, the magnesium-based material 70 is not easily burned because the connection with oxygen in the atmosphere is blocked. Therefore, heat resistance can be improved as compared with a material made of magnesium alone. As a result, a larger input audio signal can be supplied to the speaker unit 50 from the amplifier side, and safety related to heat resistance and the like of the speaker unit 50 can be improved.

  In this regard, when the ignition temperature was actually measured using a magnesium-based material (Comparative Example 2) made of a magnesium alloy and the magnesium-based material 70 according to the present example, this example was compared with Comparative Example 2. On the other hand, the ignition temperature could be increased by about 200 to 300 ° C.

  In addition, since the corrosion resistance can be improved as described above, a thin film such as an electrodeposition coating film made of a resin is not formed on the surface of the magnesium-based material 70, so that it is not necessary to form the magnesium-based material 70. It is possible to improve the Young's modulus. Therefore, when the speaker device component is the diaphragm 7, the diaphragm 7 for thin and light high-frequency range reproduction can be configured. As a result, the natural frequency of the diaphragm 7 can be increased, and the frequency characteristics of the mid-high range in the speaker device 100 can be improved.

  In the present invention, the material structure of the speaker device component is not limited to the above.

  That is, in another embodiment of the present invention, as shown in FIG. 2B, a film 71 can be formed on the surface of the magnesium-based material 70 to form a multilayer structure. In a preferred example, the film 71 is preferably a film made of any one or a combination of a chemical conversion film, an anodized film, an electrodeposition coating film, a spray coating film, a sputtering film, and a plating film. Thereby, corrosion resistance can be further improved. In particular, in this embodiment, since the corrosion resistance of the magnesium-based material 70 itself is improved, the formation amount (thickness d1) of the film 71 on the surface of the magnesium-based material 70 can be reduced in the surface treatment step. Accordingly, the cost of the speaker device component can be reduced.

  In still another embodiment of the present invention, as shown in FIG. 2C, an electrodeposition coating film 72 may be further formed on the surface of the film 71 to form a multilayer structure. When the coating 71 is an electrodeposition coating or the like, it is not necessary to form the electrodeposition coating 72 on the surface of the coating 71. Thereby, the designability etc. of the structural member for speaker apparatuses can also be improved. In particular, in this embodiment, since the corrosion resistance of the magnesium-based material 70 itself is improved, the application amount (thickness d2) of the electrodeposition coating film 72 to the surface of the film 71 is reduced in the electrodeposition coating process. Therefore, the cost of the structural member for the speaker device can be reduced accordingly.

[Manufacturing method of speaker device component]
Next, with reference to FIG. 3 and FIG. 4 etc., the manufacturing method of the structural member for speaker devices used as the application object of this invention is demonstrated. FIG. 3 is a flowchart showing a method of manufacturing a speaker device component to which the present invention is applied. FIG. 4 shows a rolling process diagram corresponding to the rolling process P1 in FIG.

  First, a magnesium-based material 70 having a predetermined thickness and made by adding calcium to 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. Obtain (rolling step P1).

  In a preferred example, the magnesium-based sheet 24 is preferably formed by rolling a magnesium-based material 70 obtained by adding 2 wt% of calcium to the magnesium alloy AZ61 to a thickness of about 0.044 mm.

  Here, an example of the rolling process 200 will be described.

  The rolling mill 23 rolls the magnesium-based material 70 to a predetermined thickness while applying a certain tension while rotating in a certain direction, and the magnesium-based material 70 at a predetermined temperature. And a thermostat 22 for heating.

  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 70 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 is preferable to perform rolling while heating to about 200 to 400 ° C., preferably about 300 ° C., in the thermostatic chamber 22. As a result, the magnesium-based material 70 that is hardly plastically deformed is easily rolled.

  Next, the flow of the rolling process 200 will be described. First, the magnesium-based material 70 having a certain thickness is fed to the rolling mill 23 by a feeding device (not shown) (arrow s1). Next, the rolling rollers 21a and 21b rotate in a certain direction (arrows s2 and s3), while rolling the magnesium-based material 70 to a predetermined thickness, and sending the magnesium-based material 70 into the thermostatic chamber 22. The magnesium-based material 70 is heated to a predetermined temperature while passing through the thermostatic chamber 22 and is easily plastically deformed. Next, when the magnesium-based material 70 is sent from the thermostat 22 to the rolling rollers 21c and 21d, the rolling rollers 21c and 21d rotate in a certain direction (arrows s4 and s5), and the magnesium-based material 70 is rolled again. To do. Then, by rolling the magnesium-based material 70 a plurality of times with different rolling amounts by the above rolling method, a magnesium-based sheet 24 having a desired thickness is finally obtained (arrow s6).

  In the present example, as described above, when the magnesium-based material 70 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 70 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 excessively large, defects such as cracks, warpage, or pinholes occur in the magnesium-based material 70 due to the influence of residual strain that is latent in the magnesium-based material 70, and the yield increases. Leading to a decline. Therefore, in this example, the rolling amount per time is reduced to about 1 to 20 μm, and the magnesium-based material 70 is rolled a plurality of times, so that the above problems are eliminated and the yield is improved.

  In addition, said rolling method example shows an example to the last, and the rolling method, the amount of rolling for every time, the thickness of the magnesium-type sheet | seat 24, etc. are not restricted to this.

  Next, returning to FIG. 3, the obtained magnesium-based sheet 24 is molded by a known method by a molding process. For example, the frame 8, the voice coil bobbin 4, the damper 6, the diaphragm 7, the edge 9, and the like illustrated in FIG. The speaker device constituent members such as the cap 10 and the casing 51 are obtained (molding step P2).

  Next, by a known surface treatment process, a dense and high elastic film 71 such as a chemical conversion film, an anodized film, an electrodeposition coating film, a spray coating film, or a sputtering film is formed on the surface of the speaker device component. Then, a film made of any one or a combination of plating films is formed to a predetermined thickness, for example, about 0.001 mm (surface treatment process P3). In this surface treatment process P3, a further well-known electrodeposition coating process can be provided, and the electrodeposition coating film 72 can be formed on the surface of the film 71 by the electrodeposition coating process. Here, when the coating 71 is an electrodeposition coating or the like, it is not necessary to form the electrodeposition coating 72 on the surface of the coating 71.

  Through the above steps, the speaker device constituting member of the present invention is manufactured. According to the manufacturing method of the component member for a speaker device manufactured in this way, the above can be performed.

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 partial expanded sectional view which expands and shows the various raw material structures of the structural member for speaker apparatuses of this invention. 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.

Explanation of symbols

4 Voice coil bobbin 6 Damper 7 Diaphragm 8 Frame 9 Edge 10 Cap 50 Speaker unit 51 Housing 70 Magnesium-based material 71 Film 72 Electrodeposition coating 100 Speaker apparatus

Claims (5)

  A component for a speaker device, comprising a magnesium-based material obtained by adding calcium to magnesium or a magnesium alloy.   The constituent member for a speaker device according to claim 1, wherein a film is formed on a surface of the magnesium-based material.   3. The speaker device according to claim 2, wherein the film is a film formed of any one or a combination of a chemical conversion film, an anodized film, an electrodeposition coating film, a spray coating film, a sputtering film, and a plating film. Constituent member.   The component for a speaker device according to any one of claims 1 to 3, wherein the amount of calcium added is 0.1 wt% to 50 wt%.   A speaker apparatus provided with the structural member for speaker apparatuses as described in any one of Claims 1 thru | or 4.

Images