JPS5814698

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DESCRIPTION JPS5814698
[0001]
The present invention relates to an electrodynamic speaker, and more particularly to an
improvement of a speaker using a so-called 7-lexiple substrate in which a metal plate and a
plastic are joined and integrated as is often seen on circuit boards as a speaker diaphragm. When
such a composite plate is used as a diaphragm, various patterns can be formed by etching, which
is useful in that, for example, the terminal of a voice coil can be easily processed. That is, the
voice coil is fixed to the approximate center of the diaphragm, but its end is left on the
diaphragm and welded directly to the metal pattern, and the pattern is guided toward the
periphery, for example, it is easy to connect other circuits to the diaphragm The electrical
connection of the voice coil can be very easily made by connecting to the protrusion provided on
the In the electrodynamic speaker, the most expensive voice coil terminal processing is
simplified, and the assembly workability is significantly improved. However, if the lead extraction
pattern is provided from the center toward the periphery, the rigidity of only that portion is
increased, and FIG. 1 showing various secondary vibrations is an example of the diaphragm
before improvement. The drawing shows a plan view of the speaker diaphragm, and the blackpainted part is the part where the metal plate remains by etching. Reference numeral 1 denotes
an edge portion without a metal plate, and 2Fi is a central rigid portion provided by
consideration for rigid body motion at the center of 2Fi. sB is a voice coil fixed to the central rigid
part. The terminal 5 Fi of the voice coil 3 is welded to the central rigid portion 2. A protruding
portion for electrical connection with the four-speaker driving circuit, and a lead pattern 6 is
provided from the central rigid portion 2 toward the protruding portion 4. Therefore, good
speaker characteristics can be expected from forming the edge portion 1 and the rigid portion 2
like a configuration of 0 or more capable of supplying an electrical signal from the projecting
portion 4 to the voice coil 5, but the lead pattern 6 is originally It exists in the edge part where
the combuance should be high and lowers the combuance to impair the edge effect. Furthermore,
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there are two lead patterns 6 at symmetrical positions, and such a harmonic that makes this
pattern 6 a node There is a disadvantage that it is easy to induce wave vibration (a mode in
which the node diameter is 19). The present invention is based on the above point and is
intended to obtain sensible speaker characteristics by utilizing the fact that fa-shaped patterns
can be easily obtained by etching. FIG. 2 is a plan view of a diaphragm according to the present
invention, and FIG. 5 is a cross-sectional view of the diaphragm incorporated in a magnetic
circuit. In FIG. 2, it is a 1Fi cutting edge portion, and the metal plate is removed by etching.
The voice coil 3 is fixed to the central rigid body portion where the 2 # 'i metal plate is left, and
the terminal 5 is connected to the central rigid body portion 2. A protrusion 4 is connected to the
drive circuit at the cough protrusion 4. ６ａ。 6b # 'i is a lead pattern led from the central rigid
portion 2 toward the projecting portion 4 and formed in an arc shape. Reference numerals 7a
and 7b denote discarding patterns which have the same shape as the lead patterns 6a and 6b,
and are provided at different angles with respect to 6a and 6'b. FIG. 3 is a cross-sectional view as
a speaker using the diaphragm shown in FIG. A magnetic circuit is formed on the yoke 1018
stone 9 ° pole piece 8, and the voice coil 3 is inserted in the magnetic gap formed by the
magnetic circuit. ? The Iij frame supports and fixes the periphery of the diaphragm and the yoke.
In the speaker having such a configuration, a current is caused to flow in the voice coil 3 due to a
human-generated signal from the protrusion 4 to cause vibration. The central rigid portion to
which the voice coil is attached has high rigidity due to the metal plate and integrally vibrates,
and the peripheral edge portion 2 mainly performs flexural vibration. Although the patterns of
the edge portions 2I / cFi 6a, 6b, 7a, 7b are formed in an arc shape, the pattern length becomes
longer as compared with FIG. In addition, discard patterns 7a, 7b, etc. are provided
symmetrically, and deflection vibration is performed evenly in the dark direction. FIG. 4 shows
another embodiment, wherein lead patterns 4a, 6b and discard patterns 7a. 7b is formed by a
circular arc and a straight line. As compared with the shape of w42, the edge portion 11ri is
more likely to be deflected, and the co-shooting wave number of the basic mode can be lowered.
As described above, according to the present invention, since it is used as a metal plate and a
plating plate tube diaphragm made of plastic, electrical connection of the voice coil is easy, and
the assembling workability of the speaker is good. By devising the shape of the metal plate, it is
possible to form a central rigid part, an edge part, a lead turn, a dump pattern, obtain a desirable
vibration form as a speaker, and produce a speaker with good characteristics at a low speed
strike .
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a plan view of a conventional speaker diaphragm, and FIG. 2 is a plan view of a speaker
diaphragm according to the present invention.
FIG. 3 is a cross-sectional view of a speaker incorporating a diaphragm in 2 EK. FIG. 4 shows
another embodiment. DESCRIPTION OF SYMBOLS 1 ... Edge part 2 ... Central rigid part 3 ... Voice
coil 4 ... Projected part 5 ... Coil terminal 6a, 6b ... Lead pattern 7a, 7b ... Discarding pattern 8 ...
Pole Piece 9 · · · Magnet 10 · · · Yoke 11 · · · frame or more best agent 3rd 1st mouth 2 2 57b J
Figure
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