CN107071659B

CN107071659B - Acoustic diaphragm and loudspeaker device comprising same

Info

Publication number: CN107071659B
Application number: CN201710385674.1A
Authority: CN
Inventors: 李志伟; 张任君; 廖翊傑
Original assignee: Ming Chi University of Technology
Current assignee: Ming Chi University of Technology
Priority date: 2017-05-26
Filing date: 2017-05-26
Publication date: 2020-03-27
Anticipated expiration: 2037-05-26
Also published as: CN107071659A

Abstract

The invention provides an acoustic diaphragm, which comprises: a cone; and a suspended edge surrounding the cone; wherein, a film containing Ti-Zr amorphous alloy is formed on the surface of the cone substrate, the suspended edge substrate or both. In addition, the invention also provides a loudspeaker device containing the acoustic diaphragm.

Description

Acoustic diaphragm and loudspeaker device comprising same

Technical Field

The invention relates to an acoustic diaphragm and a loudspeaker device comprising the same, in particular to an acoustic diaphragm comprising a titanium-zirconium amorphous alloy film and a loudspeaker device comprising the same.

Background

The speaker, also called "loudspeaker", its vocal principle is: the current generates an electromagnetic field to the electric coil to form a magnetic pole; the electrical coil and the magnet then attract or repel each other with their magnetic poles, and the attraction or repulsion causes the acoustic diaphragm to contract inwardly or expand outwardly to generate an air flow to generate sound.

The material of the acoustic diaphragm is the key to determine the sound quality. At present, a common acoustic diaphragm is plated with a coating on a substrate, and the substrate can be made of metal, plastic, cloth, or paper; the material of the plating layer can be nickel, gold, silver, copper, chromium, titanium, aluminum, iron, indium, zirconium, germanium, tantalum, tungsten, beryllium or other metal, nickel-iron alloy, titanium-magnesium alloy, silver-tin alloy, beryllium alloy, titanium alloy, boron alloy or other alloy, alumina, titanium oxide, magnesium oxide, tantalum oxide, indium tin oxide, silicon dioxide, aluminum oxide or other oxide, diamond, carbon, boron, diamond-like, carbide, boride, or nitride (please see taiwan new patent publication nos. M358503, M498432, taiwan patent publication No. I836, mainland utility model publication nos. CN201758445U, CN204291352U, CN87215838U, mainland patent publication nos. CN1925696B, CN100397953C, CN1303848C, mainland invention patent publication No. CN104562140A, US patent publication nos. US4135601, US 7570479, US5241140, US 75324).

As can be seen from the above, the materials of the diaphragm are very various, but as users have more and more selected the quality of the sound emitted from the speaker, it is necessary to develop an acoustic diaphragm made of other materials to meet the needs of the ears of the users.

Disclosure of Invention

One objective of the present invention is to provide a novel acoustic diaphragm, which can prevent the sound distortion generated by the loudspeaker device when the diaphragm is installed in the loudspeaker device.

Thus, the present invention proposes an acoustic diaphragm comprising: a cone (cone); and a dangling edge (surround) surrounding the cone; wherein, a film containing Ti-Zr amorphous alloy is formed on the surface of the cone substrate, the suspended edge substrate or both.

According to the present invention, high rigidity, low specific gravity, or high internal damping can be imparted to the film by adjusting the type and ratio of the composition of the alloy film. Once the film is installed on the loudspeaker, the distortion of sound generated by the loudspeaker can be avoided.

According to the above feature, the present invention also provides a speaker device including: a magnet; an electric coil surrounding the magnet; and the acoustic diaphragm is arranged at one end of the magnet and one end of the electric coil.

Drawings

Fig. 1 is a schematic view of a speaker device according to an embodiment of the present invention.

Fig. 2 is a schematic view of an acoustic diaphragm of the above-described speaker device.

(1) The device comprises a magnet, (2) an electric coil, (3) an acoustic diaphragm, (31) a cone, (32) a suspension edge, (4) a frame and (5) a dustproof film.

Detailed Description

In order to make the aforementioned and/or other objects, functions and features of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below:

the present invention has been accomplished on the basis of an unexpected finding that a thin film containing a titanium-zirconium amorphous alloy can have high rigidity, low specific gravity, or high internal damping by its composition type and ratio. Thus, when the membrane is part of an acoustic diaphragm of a loudspeaker device, distortion of the sound emitted by the device is avoided. In particular, the high rigidity characteristic can effectively avoid distortion of sound emitted from the device by reducing sound segmentation motion (sound segmentation) caused by high frequencies; the low specific gravity characteristic can effectively avoid the sound distortion of the device by endowing the diaphragm with high sensitivity; the high internal damping characteristics can effectively avoid distortion of the sound emitted by the device by enhancing the absorption of vibration caused by the airflow.

Referring to fig. 1, a speaker device according to an embodiment of the present invention is shown. The "speaker device" herein is not limited to a speaker, and may be an earphone including: a magnet (1), an electric coil (2), an acoustic diaphragm (3), a frame (4), and a dust-proof film (5). The electric coil (2) surrounds the magnet (1); the acoustic diaphragm (3) is arranged at one end of the magnet (1) and one end of the electric coil (2); the frame (4) is connected with the acoustic diaphragm (3) to fix the acoustic diaphragm; the dustproof film (5) partially or completely covers the acoustic diaphragm (3) so as to prevent particles such as dust from attaching to the acoustic diaphragm (3) and destroying sound authenticity.

As shown in fig. 2, the acoustic diaphragm (3) of the present embodiment includes: a cone (31), and a suspended edge (32), wherein the suspended edge (32) surrounds the cone (31), and a thin film containing Ti-Zr amorphous alloy is formed on the surface of the base material of the cone (31), the base material of the suspended edge (32), or both. Examples of the titanium-zirconium-containing amorphous alloy-containing film may be, but are not limited to, a zirconium-titanium-iron metallic glass film, a titanium-zirconium-boron-nitrogen metallic glass film, a titanium-tungsten-zirconium metallic glass film, a zirconium-titanium-iron-type diamond film, or a titanium-tungsten-zirconium-type diamond film. It must be noted that the term "metallic glass" is synonymous with "amorphous metal" and means that the metal in the material is structurally disordered on an atomic scale; the term "diamond-like" means carbon in sp-form in a material²And sp³Mixed orbital bonding, but still remains diamond-like (all sp carbon)³Hybrid orbital bonding).

In a preferred embodiment, the film containing the titanium-zirconium amorphous alloy is a zirconium-titanium-iron metallic glass film. Under the condition, the film containing the titanium-zirconium amorphous alloy contains 40 to 45 at.% of zirconium element, 18 to 25 at.% of titanium element and 35 to 40 at.% of iron element, and the elastic coefficient of the film is between 100 and 120GPa, and the specific gravity is between 6.6 and 7.0.

In another preferred embodiment, the film containing the titanium-zirconium amorphous alloy is a titanium-zirconium-boron metallic glass film. Under the condition, the film containing the titanium-zirconium amorphous alloy contains 30 to 36 at.% of zirconium element, 44 to 49 at.% of titanium element and 15 to 22 at.% of boron element, and the film has an elastic coefficient of 140 to 180GPa and a specific gravity of 4.5 to 5.7.

In another preferred embodiment, the film containing the titanium-zirconium amorphous alloy is a titanium-zirconium-boron-nitrogen metallic glass film. Under the condition, the film containing the titanium-zirconium amorphous alloy contains 29 to 35 at.% of zirconium element, 43 to 48 at.% of titanium element, 16 to 22 at.% of boron element and 4 to 10 at.% of nitrogen element, and the film has an elastic coefficient of 170 to 210GPa and a specific gravity of 4.0 to 4.7.

In another preferred embodiment, the film containing the titanium-zirconium amorphous alloy is a zirconium-titanium-iron metallic glass film. Under the condition, the film containing the titanium-zirconium amorphous alloy contains 54 to 60 at.% of zirconium element, 27 to 33 at.% of titanium element, and 12 to 18 at.% of iron element, and the film has an elastic coefficient of 80 to 90GPa and a specific gravity of 6.0 to 6.2.

In another preferred embodiment, the film containing the titanium-zirconium amorphous alloy is a titanium-tungsten-zirconium metallic glass film. Under the condition, the film containing the titanium-zirconium amorphous alloy contains 30 to 35 at.% of zirconium element, 35 to 40 at.% of titanium element and 30 to 35 at.% of tungsten element, and the film has an elastic coefficient of 110 to 120GPa and a specific gravity of 10.0 to 10.5.

In another preferred embodiment, the film containing titanium-zirconium amorphous alloy is a zirconium-titanium-iron diamond film. Under the condition, the film containing the titanium-zirconium amorphous alloy contains 1 to 3 at.% of zirconium element, 1 to 3 at.% of titanium element, and 1 to 5 at.% of iron element, the remainder being carbon element; the elastic coefficient of the film is between 150 and 180Gpa, and the specific gravity is between 2.8 and 3.2.

In another preferred embodiment, the film containing the titanium-zirconium amorphous alloy is a titanium-tungsten-zirconium diamond film. Under such conditions, the titanium-zirconium amorphous alloy-containing film contains 1 to 3 at.% of zirconium element, 1 to 3 at.% of titanium element, and 1 to 5 at.% of tungsten element, the remainder being carbon element; the elastic coefficient of the film is between 150 and 180Gpa, and the specific gravity is between 2.8 and 3.2.

Table 1 lists the film compositions and properties of various examples of the present invention.

TABLE 1 composition and Properties of the films

As can be concluded from table 1, (1) the Zr — Ti — Fe metallic glass thin film belongs to a thin film with medium elastic coefficient and medium density, and has high damping property, and thus is suitable for being disposed on the surface of the cone or the suspended edge substrate of the acoustic diaphragm; (2) the Ti-Zr-B metallic glass film, the Ti-Zr-B-N metallic glass film, the Zr-Ti-Fe type diamond film and the Ti-W-Zr type diamond film belong to films with high elastic coefficient and low density, so the film is suitable for being arranged on the surface of a cone base material of the acoustic vibrating diaphragm; (3) the Zr-Ti-Fe metallic glass film and the Ti-W-Zr metallic glass film belong to films with low elastic coefficient and high density and have high damping property, so the Zr-Ti-Fe metallic glass film and the Ti-W-Zr metallic glass film are suitable for being arranged on the surface of a cone base material of an acoustic vibrating diaphragm.

Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. An acoustic diaphragm, comprising:

a cone; and

the suspension edge surrounds the cone;

wherein a film containing Ti-Zr amorphous alloy is formed on the surface of the cone substrate, the suspension edge substrate, or both, wherein when the film containing Ti-Zr amorphous alloy is a Zr-Ti-Fe-based diamond film, it contains 1 to 3 at.% Zr element, 1 to 3 at.% Ti element, and 1 to 5 at.% Fe element.

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

3. The acoustic diaphragm of claim 2, wherein when the titanium-zirconium-containing amorphous alloy-containing film is a zirconium-titanium-iron metallic glass film, it contains 40 to 45 at.% of zirconium element, 18 to 25 at.% of titanium element, and 35 to 40 at.% of iron element.

4. The acoustic diaphragm of claim 2, wherein when the titanium-zirconium-containing amorphous alloy-containing film is a titanium-zirconium-boron metallic glass film, it contains 30 to 36 at.% of zirconium element, 44 to 49 at.% of titanium element, and 15 to 22 at.% of boron element.

5. The acoustic diaphragm of claim 2, wherein when the titanium-zirconium-containing amorphous alloy-containing film is a titanium-zirconium-boron-nitrogen metallic glass film, it contains 29 to 35 at.% of zirconium element, 43 to 48 at.% of titanium element, 16 to 22 at.% of boron element, and 4 to 10 at.% of nitrogen element.

6. The acoustic diaphragm of claim 2, wherein when the titanium-zirconium-containing amorphous alloy-containing film is a zirconium-titanium-iron metallic glass film, it contains 54 to 60 at.% of zirconium element, 27 to 33 at.% of titanium element, and 12 to 18 at.% of iron element.

7. The acoustic diaphragm of claim 2, wherein when the titanium-zirconium-containing amorphous alloy-containing film is a titanium-tungsten-zirconium metallic glass film, it contains 30 to 35 at.% of zirconium element, 35 to 40 at.% of titanium element, and 30 to 35 at.% of tungsten element.

8. The acoustic diaphragm of claim 2, wherein when the titanium-zirconium-containing amorphous alloy-containing film is a titanium-tungsten-zirconium-based diamond film, it contains 1 to 3 at.% of zirconium element, 1 to 3 at.% of titanium element, and 1 to 5 at.% of tungsten element.

9. A speaker apparatus, comprising;

a magnet;

an electric coil surrounding the magnet; and

an acoustic diaphragm according to any one of claims 1 to 8, disposed at one end of the magnet and the electric coil.