JPS6154798A - Diaphragm for speaker - Google Patents

Abstract

PURPOSE:To improve rigidity and oscillation propagation speed by forming a hard layer composed of a mixed material of a nitriding inorganic material and a carbonizing inorganic material by a ion plating method at the surface with a titanium metallic plate as a substrate. CONSTITUTION:In an ion plating processing to a titanium metallic diaphragm substrate 2, a 25mu thick titanium metallic diaphragm substrate 2 is cleaned, and after pressure is decreased to 10<-6>Torr, ion irradiation of nitriding titanium and carbonizing titanium is executed at direct current of several hundred V-1kV in the argon gas atomosphere (10<-2>Torr). In this case, in a vacuum degree 10<-4>Torr [N2 + hydrocarbon (CH4): mixed gas], a titanium evaporating speed becomes 0.g/MiN and a deposition speed of a mixed material of nitriding titanium (TiN) and carbonizing titanium (TiC) becomes 0.04mum/MiN. Thus, the above-mentioned hard layer 3 is formed on the titanium metallic plate 2, and after cooling, molding is suitably molded as a dome-type, cone-type, a plane-type diaphragm or a chamber.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a diaphragm for a speaker that is designed to improve high-frequency characteristics by increasing the surface hardness of the diaphragm.

[Prior art] In general, various methods are known for increasing the rigidity of a diaphragm for speakers in order to improve its high-frequency characteristics and sound quality. By forming a hard layer of aluminum, silicon carbide, silicon oxide, zero carbide, etc., it improves the rigidity of the diaphragm.

However, in the nine conventional ones mentioned above.

Single inorganic material TLC work 9 reinforcements rounded into 6 pieces,
There is a limit to its strength, and in particular, as a diaphragm for ultra-high-pitched speakers, it is not possible to completely suppress split vibrations and odd vibrations, and even more (rigid) diaphragms are manufactured. .

(Problems to be Solved by the Invention) The present invention has been made in view of the above points.9. The purpose is to provide a speaker diaphragm that can increase the propagation speed [k] and greatly increase the rigidity.

(Means for Solving the Problems) In the speaker diaphragm according to the present invention, at least one side of the titanium metal diaphragm base material is coated with carbon by ion blating method.
A hardened layer made of a mixed material of an inorganic dinitride material and an inorganic carbide material is formed, which has better surface hardness, rigidity, etc., and can provide good reproduced sound metal.

(Example) A seventh embodiment of a speaker diaphragm according to the present invention will be described based on the drawings.

Is k1 in the diagram the entire speaker vibration plate? 2 shows a titanium metal diaphragm base material as its base material & 3 shows a mixture of an inorganic nitride material and an inorganic carbide material formed on the surface of the titanium-gold maple diaphragm base material 2 by an ion-blating method. In the embodiment, a mixed material of titanium carbide and titanium nitride is used, and the hardened PA3 is formed on both sides of the J: lithium metal diaphragm base material 2 using an ion-blating method. The hardened JOj3 does not necessarily need to be formed on both sides, and may be formed only on either the front or back side.

To explain the specific manufacturing process of the diaphragm, the ion blating process on the titanium metal diaphragm base material 2 requires a
25μ thick titanium metal diaphragm base 2, cleaned, 10-''
” After reducing the pressure to TOrr, create an argon gas atmosphere (10
Ion irradiation is performed on titanium nitride and titanium carbide at a DC voltage of several hundred V to IKV in a low Torr.
K 10-' Torr (Nt + hydrocarbon (OH
4) : Mixed gas), titanium evaporation rate 0.5f
/MiN, titanium nitride (TIN) and titanium carbide (Ti
The deposition rate of the mixed material with e) is 0.04μIll/MIN
becomes.

In this manner, the hard layer 3 is formed on the titanium metal plate 2, and after cooling, it is appropriately formed into a dome-shaped, hunched-shaped, planar-type diaphragm, etc., or a chamber.

Comparing the vibration propagation speeds of the speaker diaphragm 1 with the grooved bottom as described above and the conventional speaker diaphragm using a single inorganic layer, it is found that the 20μ titanium metal diaphragm base material 2 is used as a substrate and is coated on both sides. Titanium chloride coating (single substance) R is only 5000 to 6000 i/sec for the one with shadow formation,
Vibration propagation speeds of l'j of 7,000 to 9,000 m/sec were obtained when the hard layer 3' was formed with a thickness of 1 μm on both sides of the same substrate. This has a particularly significant effect on the frequency response characteristics of high-frequency speakers, and can be accommodated over a wide range. Moreover, when manufacturing the diaphragm, there is no need to make any major changes compared to when using conventional single-piece ammonia materials, and the conventional manufacturing equipment can be used as is, resulting in good productivity. .

(Effects of the Invention) According to the speaker diaphragm according to the present invention, the diaphragm is made of a titanium metal plate having excellent characteristics as a diaphragm for a high-frequency speaker.
Since it is formed from a hard layer made of a mixed material of an inorganic nitride material and an inorganic carbide material, it is possible to achieve the same level of rigidity and propagation speed of the wave, and it is possible to obtain reproduced sound with little distortion up to ultra-high frequencies.

Moreover, bAL/ does not require any special equipment for manufacturing and has good mass productivity, so it has excellent features such as no increase in cost.

[Brief explanation of the drawing]

The drawings show an example of a speaker diaphragm according to the present invention,
Figure 1 is a sectional view showing a diaphragm assembly for a dome-shaped tweeter, and Figure 2 is a cross-sectional view showing a diaphragm assembly for a dome-shaped tweeter.
Figure T6. 1: the entire diaphragm, 2: a titanium metal diaphragm base material, 3: a hard layer made of a mixed material of an inorganic nitride material and an inorganic carbide material.

Claims (1)

[Claims] 1. A speaker characterized in that a hard layer made of a mixed material of an inorganic nitride material and an inorganic carbide material is formed on at least one side of a titanium metal diaphragm base material by an ion plating method. diaphragm for use. 2. Claim 1, characterized in that the nitriding inorganic material is titanium nitride, and the carbide inorganic material is titanium carbide.
The speaker diaphragm described in section 1.