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JPS5212824

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DESCRIPTION JPS5212824
1, Invention title 2, Inventor Onkyo Co., Ltd. 3, Patent applicant Osa Sakhsh Neyaga Nishiwaki
Shinsho Co., Ltd. Name 2 (No. 1) Nisshincho, Neyagawa City 572 Osaka Prefecture Name (027)
Onkyo Co., Ltd. 4, 31 people Representative control daishiro hiroshio サ カ フ カ フ ワ シ ニ チ
ョ ウ 〒 address 572 Osaka 寝 Nichikawa-cho Nisshincho No. 1 ■ Japan Patent Office Open
Patent Gazette ■ JP 52-128240 Open Japan (1977)、1. '31. Japanese Patent
Application No. 50-g '1554- [phase] Application date 50. (In 197) · '7.2 / 64- 1; 555 specification
1, title of the invention 1, title of the invention
スピーカー
3. Detailed Description of the Invention The present invention relates to a speaker having a metal
diaphragm having a novel composition and structure, in which the Young's modulus is increased
to raise the high frequency reproduction limit frequency. The diaphragm of the speaker can take
various vibration modes in the reproducible frequency band, but the high frequency
reproduction limit frequency fh which determines the characteristics in the high region is given
by the following equation. Here, MC and Mv are the diaphragm and the effective mass of the
voice coil, E is the Young's modulus of the diaphragm, tc is the thickness of the attachment @
(top) of the diaphragm, and θ is the half apex angle. Therefore, by increasing the Young's
modulus E of the diaphragm, the high frequency reproduction limit frequency can be increased,
and the frequency characteristic can be extended flat to the high frequency. Somehow,
conventional, especially metal diaphragms are used as diaphragm materials, hard light metals
such as aluminum and titanium, and this hard light metal thin plate is press-formed into a
predetermined cone shape or dome shape and then heat treated It has a structure, and the
physical properties inherent to the diaphragm material limit the Young's modulus E. Therefore,
the upper limit frequency also has a limit. The present invention takes advantage of the surface
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hardening technique by nitriding metal to remove the above-mentioned drawbacks by utilizing
the metal diaphragm of the speaker. Metal nitriding is a technology for forming a dispersed hard
structure of nitride in the surface layer of metal, and is characterized in that the hardness of the
surface is significantly increased. The metal nitriding method includes an ion method, a gas
method and a salt bath method, and the ion method is adopted as one embodiment of the present
invention. As the metal diaphragm incorporated into the speaker of the present invention, hard
light metal such as aluminum (thickness 30 to 50 microns, titanium (thickness about 20
microns)) is used as in EndPage: 1 conventional. In this embodiment, a titanium thin plate having
a thickness of 20 microns is formed into a predetermined cone shape or dome shape, and then a
titanium diaphragm heated to about 400 to 60 Q.degree. C. in ionized nitrogen gas is used for
several minutes to several tens of minutes. In this manner, nitriding is carried out from the front
and back sides of the titanium diaphragm toward the inside to form a nitride (titanium nitride),
and hard titanium nitride is dispersed. The thickness of the titanium layer is approximately
proportional to the nitriding time. Although the Young's modulus E of the titanium diaphragm is
significantly increased by such a titanium nitride layer, in the above embodiment, an aluminum
diaphragm and a titanium diaphragm all of which are completely nitrided under predetermined
nitriding processing conditions; If the Young's modulus E of is taken as an example (in units of
dyne / 1yd), the Young's modulus E of the aluminum diaphragm and titan vibration after
nitriding is approximately 4 times, therefore the high frequency reproduction limit frequency f
and h become extremely high (in theory, almost twice).
In another embodiment, a titanium diaphragm of 20 microns in thickness is nitrided under
nitriding processing conditions (ion method) with an estimated processing temperature of 450 °
C. and a processing time of 45 minutes. A dispersed titanium nitride layer of about 5 microns of
nitride (titanium nitride) was formed. When the Young's modulus E of this titanium nitride
diaphragm and a titanium diaphragm not subjected to nitriding processing are measured (unit:
dynelcr &), the Young's modulus E almost doubles. Also, nitriding by the salt bath method The
Young's modulus E of the titanium nitride diaphragm in which approximately 5 microns of
titanium nitride layer is formed on both the front and back sides by processing is as described
above, and it is about 1.5 times that of a titanium diaphragm that has not been nitrided
Increased. FIGS. 1 and 2 are diagrams comparing the frequency characteristics of the
conventional high to high pitched speaker incorporating the titanium diaphragm and the high to
high pitched speaker incorporating the titanium nitride diaphragm of the above embodiment. In
FIG. 2 showing the second harmonic distortion characteristics, as indicated by the solid line a in
the drawing, the second high frequency distortion is generally reduced in the low band, and a
reduction of about 4 dB can be confirmed particularly in 2KH2. Furthermore, it was also
confirmed that the second high frequency distortion was generally reduced also in the high
region (3 to 15 KHz). As apparent from the above measurement data, this titanium nitride
diaphragm has a three-layer structure in which a titanium layer having unique physical
properties, which is not nitrided, is interposed between titanium nitride layers formed on both
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front and back sides. The structure is such that the Young's modulus of the entire diaphragm is
significantly increased by the titanium nitride layers on both the front and back sides, and the
middle titanium layer has viscosity relative to the titanium nitride layers on both sides and
retains a proper internal loss. In particular, abnormal vibration mode or local abnormal vibration
is suppressed in the high region, and interference of vibration is suppressed and distortion is
reduced. Furthermore, the thickness of the nitride layer on both the front and back sides can be
easily adjusted according to the individual metal diaphragms in addition to the above example by
appropriately setting not only one ion method but also two nitrided processed tea In addition,
according to the above-mentioned ion method, the covering mask can be formed on the
unnecessary part of the nitriding, and the nitride layer can be partially formed on both the front
and back sides of the metal diaphragm. . As described above, the speaker according to the
present invention is characterized by including a metal diaphragm subjected to a nitriding
process as a metal diaphragm, and the Young's modulus E of the metal diaphragm can be
remarkably increased. It can be set higher, and it is possible to realize a speaker with low
distortion, having flat frequency characteristics up to high frequency.
4. Brief Description of the Drawings FIGS. 1 and 2 are diagrams showing frequency
characteristics of the speaker of the present invention. EndPage: 21, Title of Invention 1, Title of
Invention Speaker 2, Inventor Onkyo Co., Ltd. 3, Patent Assignee Oosa Kafney Yasashi Nitsubaki
Address 〒 572 Osaka Prefecture Yodoyagawa City Nisshincho Name No. 1 No. 1 (027 ) Onkyo
Co., Ltd. 4 · Representative agent 段 代 サ カ フ カ フ シ ン シ ン 〒 〒 address 572 Osaka
Nichijocho Niimachi, Osaka Prefecture ■ Japan Patent Office ■ JP JP 52-128240 release date
Aki 52. (1977) Shoulder 3164-1; 5550 Japan classification ■ Int, CI 2 ° 102 K 3 HO 2 scale 7 /
θ 0 HO 4- F? , 3) 100 specification L name of the invention L name of the invention speaker
スピーカー
3. Detailed Description of the Invention The present invention relates to a speaker having a metal
diaphragm having a novel composition and structure, in which the Young's modulus is increased
to raise the high frequency reproduction limit frequency. The diaphragm of the speaker can take
various vibration modes in the reproducible frequency band, but the high frequency
reproduction limit frequency fh which determines the characteristics in the high region is given
by the following equation. (Cone type) where Me and Mv are the diaphragm, the effective mass of
the voice coil, E is the Young's modulus of the diaphragm, and tc is the diaphragm attachment,
therefore, the Young's modulus of the diaphragm is increased by increasing the Young's modulus
E By raising the reproduction limit frequency, it is possible to flatten the frequency characteristic
to high frequencies. However, conventional metal diaphragms, in particular, hard light metals
such as aluminum and titanium are used as diaphragm materials, and this hard light metal thin
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plate is press-formed into a predetermined cone shape or dome shape and then subjected to heat
treatment. Due to the physical properties inherent to the vibrating plate material, the Young's
modulus E is limited, and therefore the upper limit frequency is also limited. The present
invention takes advantage of the surface hardening technique by nitriding metal to remove the
above-mentioned drawbacks by utilizing the metal diaphragm of the speaker. Metal nitriding is a
technology for forming a dispersed hard structure of nitride in the surface layer of metal, and is
characterized in that the hardness of the surface is significantly increased. The metal nitriding
method is an ion method, a gas method, or a salt bath method, and the ion method is adopted as
one embodiment of the present invention. EndPage: 3
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