ACOUSTIC DIAPHRAGM AND SPEAKER CONTAINING THE SAME

Abstract

The present invention provides an acoustic diaphragm including: a cone and a surround mounted around the cone; wherein an amorphous titanium-zirconium film is formed on a cone substrate, a surround substrate, or both of the substrates. The present invention also provides a speaker containing the acoustic diaphragm.

Claims

1. An acoustic diaphragm, comprising: a cone; and a surround mounted around the cone; wherein an amorphous titanium-zirconium film is formed on a cone substrate, a surround substrate, or both of the substrates.

2. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is selected from the group consisting of a zirconium-titanium-iron metallic glass, a titanium-zirconium-boron metallic glass, a titanium-zirconium-boron-nitrogen metallic glass, a titanium-tungsten-zirconium metallic glass, a zirconium-titanium-iron diamond-like film, and a titanium-tungsten-zirconium diamond-like film.

3. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a zirconium-titanium-iron metallic glass and contains 40 at %-45 at % of zirconium, 18 at %-25 at % of titanium, and 35 at %-40 at % of iron.

4. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a titanium-zirconium-boron metallic glass and contains 30 at %-36 at % of zirconium, 44 at %-49 at % of titanium, and 15 at %-22 at % of boron.

5. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a titanium-zirconium-boron-nitrogen metallic glass and contains 29 at %-35 at % of zirconium, 43 at %-48 at % of titanium, 16 at %-22 at % of boron, and 4 at %-10 at % of nitrogen.

6. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a zirconium-titanium-iron metallic glass and contains 54 at %-60 at % of zirconium, 27 at %-33 at % of titanium, and 12 at %-18 at % of iron.

7. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a titanium-tungsten-zirconium metallic glass and contains 30 at %-35 at % of zirconium, 35 at %-40 at % of titanium, and 30 at %-35 at % of tungsten.

8. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a zirconium-titanium-iron diamond-like film and contains 1 at %-3 at % of zirconium, 1 at %-3 at % of titanium, 1 at %-5 at % of iron.

9. The acoustic diaphragm as claimed in claim 1, wherein the amorphous titanium-zirconium film is a titanium-tungsten-zirconium diamond-like film and contains 1 at %-3 at % of zirconium, 1 at %-3 at % of titanium, 1 at %-5 at % of tungsten.

10. A speaker, comprising: a magnet; a wire coil mounted around the magnet; and an acoustic diaphragm as claimed in claim 1 and positioned at an end of the wire coil.

11. A speaker, comprising: a magnet; a wire coil mounted around the magnet; and an acoustic diaphragm as claimed in claim 2 and positioned at an end of the wire coil.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG. 1 is a schematic diagram showing a speaker in an embodiment of the present invention; and

[0010] FIG. 2 is a schematic diagram showing an acoustic diaphragm of the foregoing speaker.

DETAILED DESCRIPTION OF THE INVENTION

[0011] The detailed description and preferred embodiments of the invention will be set forth in the following content, and provided for people skilled in the art so as to understand the characteristics of the invention.

[0012] The inventor unexpectedly finds that an amorphous titanium-zirconium film can be provided with a high stiffness, a low specific density, or a high internal damping by adjusting the film composition and its ratio. As such, when the amorphous film is used as a part of an acoustic diaphragm of a speaker, the sound distortion of the speaker can't appear. Specifically, the high stiffness property can reduce partition vibration resulted from high frequency to efficiently prevent the sound distortion; the low specific density property can offer the acoustic diaphragm a high sensitivity to efficiently prevent the sound distortion; the high internal damping can enhance the absorption of vibration resulted from gas flow to efficiently prevent the sound distortion.

[0013] A speaker in an embodiment of the present invention is depicted in FIG. 1. The speaker herein may be a loudspeaker or a headset, and comprises: a magnet (1), a wire coil (2), an acoustic diaphragm (3), a frame (4), and a dust-proof membrane (5). The wire coil (2) is mounted around the magnet (1). The acoustic diaphragm (3) is positioned at an end of the wire coil (2). The frame (4) is connected to the acoustic diaphragm (3) for securing the acoustic diaphragm (3). The dust-proof membrane (5) partially or fully covers the acoustic diaphragm (3) so that dust particles can't adhere to the acoustic diaphragm (3) to preserve the sound reality.

[0014] As shown in FIG. 2, the acoustic diaphragm (3) according to the embodiment comprises: a cone (31) and a surround (32). The surround (32) is mounted around the cone (31), and an amorphous titanium-zirconium film is formed on a cone (31) substrate, a surround (32) substrate, or both of the substrates. An example of the amorphous titanium-zirconium film is but not limited to a zirconium-titanium-iron metallic glass, a titanium-zirconium-boron metallic glass, a titanium-zirconium-boron-nitrogen metallic glass, a titanium-tungsten-zirconium metallic glass, a zirconium-titanium-iron diamond-like film, or a titanium-tungsten-zirconium diamond-like film. It is noted the term metallic glass and the term amorphous film are used synonymously and refer to a film having metal atoms therein in disorder; the term diamond-like film refers to a film having carbon atoms linked with sp.sup.2 and sp.sup.3 hybrid orbitals, and therefore having properties similar to those of a diamond film, whose carbon atoms are all linked with sp.sup.3 hybrid orbitals.

[0015] In some examples, the amorphous titanium-zirconium film is a zirconium-titanium-iron metallic glass. Under such condition, the amorphous titanium-zirconium film contains 40 at %-45 at % of zirconium, 18 at %-25 at % of titanium, and 35 at %-40 at % of iron, and has a plastic modulus of 100-120 GPa and a specific density of 6.6-7.0.

[0016] In other examples, the amorphous titanium-zirconium film is a titanium-zirconium-boron metallic glass. Under such condition, the amorphous titanium-zirconium film contains 30 at %-36 at % of zirconium, 44 at %-49 at % of titanium, and 15 at %-22 at % of boron, and has a plastic modulus of 140-180 GPa and a specific density of 4.5-5.7.

[0017] In further examples, the amorphous titanium-zirconium film is a titanium-zirconium-boron-nitrogen metallic glass. Under such condition, the amorphous titanium-zirconium film contains 29 at %-35 at % of zirconium, 43 at %-48 at % of titanium, 16 at %-22 at % of boron, and 4 at %-10 at % of nitrogen, and has a plastic modulus of 170-210 GPa and a specific density of 4.0-4.7.

[0018] In still other examples, the amorphous titanium-zirconium film is a zirconium-titanium-iron metallic glass. Under such condition, the amorphous titanium-zirconium film contains 54 at %-60 at % of zirconium, 27 at %-33 at % of titanium, and 12 at %-18 at % of iron, and has a plastic modulus of 80-90 GPa and a specific density of 6.0-6.2.

[0019] In yet other examples, the amorphous titanium-zirconium film is a titanium-tungsten-zirconium metallic glass. Under such condition, the amorphous titanium-zirconium film contains 30 at %-35 at % of zirconium, 35 at %-40 at % of titanium, and 30 at %-35 at % of tungsten, and has a plastic modulus of 110-120 GPa and a specific density of 10.0-10.5.

[0020] In additional examples, the amorphous titanium-zirconium film is a zirconium-titanium-iron diamond-like film. Under such condition, the amorphous titanium-zirconium film contains 1 at %-3 at % of zirconium, 1 at %-3 at % of titanium, 1 at %-5 at % of iron, and the remainder carbon, and a plastic modulus of 150-180 GPa and a specific density of 2.8-3.2.

[0021] In certain examples, the amorphous titanium-zirconium film is a titanium-tungsten-zirconium diamond-like film. Under such condition, the amorphous titanium-zirconium film contains 1 at %-3 at % of zirconium, 1 at %-3 at % of titanium, 1 at %-5 at % of tungsten, and the remainder carbon, and has a plastic modulus of 150-180 GPa and a specific density of 2.8-3.2.

[0022] The compositions and physical properties of films in various examples of the present invention are listed in Table 1.

TABLE-US-00001 TABLE 1 plastic composition (at. %) modulus specific film Zr Ti Fe W B N C O (GPa) density Zr-Ti-Fe metallic glass 40-45 18-25 35-40 <5 100-120 6.6-7.0 Ti-Zr-B metallic glass 30-35 44-48 16-22 <5 140-180 4.5-5.7 Ti-Zr-B-N metallic glass 30-35 44-48 16-22 5-10 <5 170-210 4.0-4.7 Zr-Ti-Fe metallic glass 54-60 27-33 12-18 <5 80-90 6.0-6.2 Ti-W-Zr metallic glass 30-35 35-40 30-35 <5 110-120 10.0-10.5 Zr-Ti-Fe diamond-like film 1-3 1-3 1-5 89-97 <5 150-180 2.8-3.2 Ti-W-Zr diamond-like film 1-3 1-3 1-5 89-97 <5 150-180 2.8-3.2

[0023] It is concluded from Table 1 that: (1) a ZrTiFe metallic glass is a film having a medium plastic modulus, a medium density, and a high damping, and therefore it is suitable to be deposited on a cone substrate or a surround substrate of an acoustic diaphragm; (2) a TiZrB metallic glass, a TiZrBN metallic glass, a ZrTiFe diamond-like film, and a TiWZr diamond-like film are films each having a high plastic modulus and a low density, and therefore they are suitable to be deposited on a cone substrate of an acoustic diaphragm; (3) a ZrTiFe metallic glass and a TiWZr metallic glass are films each having a low plastic modulus, a high density, and a high damping, and therefore they are suitable to be deposited on a cone substrate of an acoustic diaphragm.

[0024] While the invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretation so as to encompass all such modifications and equivalent arrangements.