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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a diaphragm portion of
a conventional speaker, and FIG. 2 is an explanatory view of a diaphragm portion according to
the present invention. Xylem, 8c ······ Esshi part. Fig. 1 Fig. 2 ° C-91-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a diaphragm for an acoustic transducer such as a speaker. Recently, a diaphragm made by
combining # 11 fine fiber with a paper pulp material etc. is used for many speakers to lighten
and strengthen the diaphragm to make the piston movement of the diaphragm large and to
improve the characteristics. It is used. However, the diaphragm of this carbon fiber mixture has
conductivity, and according to the experiment, when the pitch of the eyelet on the diaphragm for
connecting the lead wire of the voice coil is 42-sum, the carbon fiber compounding ratio In the
case of 30-, the electrical resistance is 5Ω, and at 10 悌 at 1300.3 嘔, infinite results are
obtained. Therefore, if you attach an eyelet directly to the diaphragm, it will be in the sheet state
between the eyelets, and the impedance will be! In a serious case, the diaphragm itself becomes K
as it fires. In order to prevent such a drawback, the eyelet # now! As shown in Fig. 1 or vibration
as shown in Fig. 1, press the leader (2a) of the voice coil (鵞) wound on the coil bobbin + 11 with
a wrapping paper (3). Extending upward, and separately winding wrapping paper +61 having
conductive foil +41 on the top of the wrapping paper 181, and covering it with insulation coating
to penetrate the diaphragm (7), and this copper wire ring) And the lead wire (2a) are connected
by soldering or the like at the portion of the conductive foil (4). However, in the former case or
the latter case, the number of parts is increased and the work process is increased, and the work
requires skill, and in the latter case, the solder flows in @ and the insulation with the diaphragm
is poor May be The present invention is intended to improve the points as described above, and
by varying the material of the central part, that is, the coiling bin side, the conductivity of that
part is eliminated and the connection work of the voice coil can be simplified. It is an object of
the present invention to provide a diaphragm for an acoustic transducer. One embodiment will
be described below with reference to FIG. The same reference numerals as in FIG. 1 * 1 denote
the same components. In the diaphragm (8), the central portion (8, the body portion (81+), and
the edge portion (80) are integrally formed of different materials. That is, the center portion (8a)
is made of pulp prepared by selectively mixing cratt, sulfide, pulp, etc. with acetate, nylon, glass
contact or the like, and part (gb) Fi carbon welding is mixed twice. The edge part (80) is
manufactured twice as much as a soft, high breaking pulp of vibration loss required as an edge.
For this reason, there is no conductivity because it is 11 in the center (8a) Fi leg element 11 so
that even if two eyelets (9) are attached to this center portion (8a), the eyelets ( 9) Seat-like
conditions do not occur at the mutual intervals.
Therefore, this eyelet (in the portion 91, the lead wire (2a) of the voice coil (2) and the bare
decoration thread wire axis) are connected by soldering a. Accordingly, it is not necessary to
provide a winding paper (6) having a conductive foil (4) as shown in FIG. 1 which is a
conventional example, and also no insulation coating on the tinsel wire (6). The process can be
simplified], the cost can be reduced, and the insulation of the connection between the copper
thread m (6) and the voice coil (lead wire (2a) of 31) is also complete. In addition, the distance
from the coil bobbin side of the diaphragm (3) to the central part (8a) and the boundary of the
trunk part (8b) is set to a size slightly larger than the wavelength of the high limit critical
wavenumber, The Young's modulus of the entire diaphragm + 81 can be adjusted by
appropriately selecting the combination of the selection of the material and the degree of beating
to reduce the Young's modulus, and this makes it possible to adjust the overall Young's modulus.
It is possible to obtain frequency characteristics suitable for 11D, 2 豐 ′ ′ 7 Js Sway so that it
is possible to limit the u-fold high-frequency resonance and to obtain a gentle attenuation highfrequency characteristic. In particular, the peak and valley of the high-frequency characteristic
are further reduced if the boundary is non-concentric with the center of the diaphragm. By the
way, carbon fiber itself generally has a thickness of about 10 to 12μ and a length of about 6Na
8 degrees, but its bond with pulp is poor, the curve is weak and the internal loss of vibration is
small, so the edge and body It was not possible to obtain a so-called fix-edge type diaphragm
integrally formed with. For this reason, only the edge must be pre-formed with another material,
for example, urethane, rubber or cloth, and this edge must be a so-called free-edge type
diaphragm bonded to the side of the diaphragm. It is complicated. However, according to the
ninth embodiment, the edge portion (80) is integrally formed with the body portion (8b) with
another soft h material suitable for the edge, so that a fix-edge type diaphragm and Become able
to do K. In addition, since what is necessary is just the material which can disregard the center
part Fi conductivity of a diaphragm (8), even if it mix ¦ blended a small amount of carbon edge
lines, it may be sufficient.
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