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JPS5194815

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DESCRIPTION JPS5194815
Patent application (38) February 18, 1959 3 Patent applicant address Osaka Prefecture Kadoma
City Ogata Kadoma address 1002 Name (582) Matsushita Electric Industrial Co., Ltd.
Representative consideration ° Matsushita Shoji 4 agent 〒 571 Osaka Prefecture Kadoma city
List of attached documents in Daiji Kamon 1006 address 5 (1) Specification 1 (2) Drawing 1 (1)
Description [Japanese] Japanese Patent Office ■ Japanese Patent Application Laid-Open No. 519481.50 Published Japanese Patent Application No. 51. (1976) 8.1964-65552 · · Very thin metal
t is used to make the speaker dome diaphragm 3, detailed description of the invention The
present invention is a horn speaker conflict dome speaker etc. The present invention relates to a
dome-shaped diaphragm for use. First, a conventional dome-shaped diaphragm of 9 mm diameter
will be described with reference to FIG. 1 and FIG. 1 and 2, 2 is a dome-shaped shaking # slope,
and this dome-shaped diaphragm 1 has a dome portion 2, a cylindrical rising portion 3 and an
edge lf5! And 4 are integrally formed. Conventionally, the dome-shaped diaphragm 1 shown in
FIGS. 1 and 2 is used for horn speakers and dome speakers. Although it is manufactured with
noise to make the one elbow face of the speaker smile, the dome shape is used to improve the
radiation efficiency of the speaker, especially while reducing the mass. When the diaphragm 1 is
formed of thick metal foil, the dome-shaped diaphragm vibrates in the vibration mode as shown
by the broken lines in FIG. 1 and FIG. And the back pressure frequency band of the speaker
becomes narrow. In Fig. 1 and Fig. 2, the arrow indicates the direction of vibration and 2v, a
vibration node is generated at one location where the voice coil bobbin is joined, ie, inside
cylindrical rise 3 and o'rv, and this node Is not a concentric nodal circle but an elliptical shape.
The rounded dome portion 2 expands and contracts in the direction of the top thereof, and swells
or squeezes with the vibration of soldering. Conventional, with dome-shaped 4IAj LII board 1 due
to this single anomalous vibration mode? In the beaker, the high λ limit frequency lh is lowered.
The non-invention is intended to suppress one concern of the above-mentioned conventional
example, and it is possible to improve the EndPage high: 13 page area limit reproduction
frequency fhk whether it is a meat I-loss m1lli plate or not The present invention will be
described below by way of example. EXAMPLE 1 As shown in FIGS. 3 and 4, a titanium nitride
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film having a thickness of 20 .mu.m is formed into a dome-shaped diaphragm 6 by molding. The
shape of the fillb board 6 is a dome 6 and a work. The dome portion 6 has an annular curved
portion 7t ′ ′ and a radiation surface 8 ° 9 with a gl number of 14 having one curvature.
What is the size of this diaphragm 6? The diameter of the lowermost end of the dome portion 6
is 13 Q and the total height of the dome is 1311III "" Q. {Circle over (1)} A 10 μm thick boron
full set 1Q is formed. As described above, when the annular curved portion 7 is formed in the
dome portion 6 and the boron metal layer 10i of high elastic modulus is formed in the − curved
portion 7, the abnormal vibration as in the conventional example is suppressed. The n% iJ band
limit reproduction frequency Mfh is improved. Example 2 As shown in FIG. 6, a boron metal layer
11 having a thickness of 10 μm was formed on the boundary between the dome portion 6 and
the edge fn 4 in exactly the same manner as in Example 1. thing. [Example 3] Similar to the sixth
tooth, beryllium metal P3 # having a width of 3 to 4 MAR + a thickness of 10 μ at the boundary
between the dome portion e and the work and the di-portion 4 & annular curvature s7 by
vacuum evaporation. What is formed, the following table shows the prior art example よ and
above 8 Examples 1 to 301% or the limit reproduction frequency fhc1 measurement 11. In each
of the above Examples 1 to 3, only the inflected portion is present. In this example, a metal layer
1ft of 14 elastic modulus is provided at the boundary between the dome portion and the edge
portion, and the boundary portion between the j and d portions. Even if this metal 6 Beno 4 is
provided on the entire surface of the dome shaped diaphragm Although the mass is increased by
about 20%, the 亮 ”λ limit reproduction frequency is improved as compared with the
conventional example. The formation of the metal is not limited to the vacuum deposition
method, but may be, for example, a chemical vapor deposition method, an A nitrogen nitride
method, a key method, an ion plating method or the like. The material of the metal layer is boron.
Not limited to beryllium, metal materials having high elastic modulus such as alloys of nickel,
nickel and nickel, etc. may be used. As is apparent from the above examples, the dome-shaped
diaphragm according to the present invention has an annular curved portion formed entirely in
the dome portion, and at least this annular curved portion has a high modulus metal layer overall
function. C. In accordance with the present invention, according to the present invention, the
irregular vibration mode as in the prior art is suppressed, and the high-frequency limit
reproduction frequency fh can be improved to have an advantage.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view of a conventional dome yrK @
moving plate, and FIG. 2 is a top view% 43. FIG. Fig. 4 is the same view. 6 <-one. FIG. 6 is a foursided view of another embodiment. 4 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · dome shape diaphragm, 6 · · · · · · · dome
portion ... Radiation surface, 10. 11 ..... Name of metal 4 ° Attorney-General Attorney Koo et al. 1
person EndPage: 2 Fig. 1 Fig. 4 Fig. 6 Fig. 6 Inventors and agents other than the above Person (1)
Inventor (2) Agent EndPage: 3
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