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Ming Wei 1st, the name of the invention
Dynamic electroacoustic transducer with oscillating coil in air gap filled with magnetic liquid
3. Detailed description of the invention Invention G G: A dynamic electro-acoustic transducer in
which the air gap is filled with the magnetic liquid at the outer side 1 of at least one dynamic coil
and M moving imaging coil movable in the air gap Do. A dynamic loudspeaker in which the space
of the pole body, referred to as the preceding example air gap ?? ?, is filled with magnetic
liquid (in which space the dynamic = S?spin 1 wire coil is movable) is known a (Instruments AControl-System, 1975 EndPage: October, 41-44). The magnetic liquid is b1 fixed in the air gap by
the permanent magnetic field of the large polar body. The motion of the vibrating coil is
attenuated by the liquid. The first "safety" point compared to conventional dynamic devices that
are not filled with empty FA is that the thermal characteristics are squeezed. The magnetic liquid
has a very good thermal conductivity compared to air, so from the imaging coil the magnetism
1j! Resistance to heat transfer to the body is low. This allows the maximum allowable human
power of dynamic table t (2 0 swing head directed based on the same maximum temperature of
the imaging coil, a transducer in which the coil travels a relatively long stroke, It was found that
the th magnetic liquid was not sufficiently attached to the nitrogenous place in the speaker. The
liquid form in the air gap decreases with one hour of production. In addition to this phenomenon,
# 18: Discharging of the liquid through the slit may cause disturbing noise during operation of
the device. The problem of the invention is that the deposition of the magnetic liquid provides a
vessel in the form of a dynamic electronic writing system of the type mentioned at the outset.
This problem is solved according to the invention by the smooth formation of the surface of the
oscillating coil in contact with the magnetic liquid. In the case of known transducers with
magnetic liquids, the purpose of the fluid outside is to serve as a variant of the transducer device.
The valley-winding of the wire rod of the screaming coil and the friction between the magnetic
liquid and the quotient are used to dampen. The vibratory coil acts in a large stroke movement
on a transducer, such as a bass speaker, to cause friction (a starved liquid particle is released
from 1% nitrogen). This process produces low frequency audible noise in history. In the
transducer according to the invention, Table 1 of the vibrating coils 11 is formed smooth. The
disturbing friction in the direction of oscillation of the oscillating coil is thus significantly reduced
without disturbing the damping acting on the acoustical effects of the transducer device. Next,
the present invention will be described in detail with reference to the drawings. Fig. 1 shows the
i-cone diaphragm 5, the central hemisphere 1t 36, the imaging coil support 9 connected to the
cone base plate, and the transducer device for the bass speaker with 8 vibrating coils. It is
indicated by.
The vibration coil is enlarged by a gap VC of a magnetic body, which is composed of a magnetic
core and a magnet base 1, an annular permanent magnet 2 and a magnetic field 3. The air gap is
filled with the magnetic liquid 4 on both sides of the oscillating portion and coil. The outer 1j
111 of the recoil coil 8 is covered with a smooth sheet 7. That is, the ? g liquid is not in bad
condition in the vibrating coil 8 but in contact with a sharp sheet. As the sheet 7, a material
having good thermal conductivity and heat resistance is used as the sheet 7. As a result, heat can
be released from the vibrating coil 8 to the magnetic pole and the weir 3 through the sheet 7 and
the magnetic liquid 4. If the sheet 7 is made of monumental material, a slit can be provided at
one point of the sheet which is guided over the entire coil width of the island coil 8. This slit
prevents the sheet 7 from acting as a short circuit coil on the 4'F <iit + j coil 8. The imaging coil 8
is completely attached to the sheet 7. The second figure shows another way of reenacting the
smooth surface of the vibrating coil. The vibrating coil (shown at 10), which has a rectangular
four-sided face, is wound at a low or at a low level on the coil support 9 by simultaneously using
a contact material having a rectangular cross section. The rate, and hence the force i rate of the
device, is improved. In FIG. 3, the front opening of the vibrating coil 11 is scraped by the rack 12.
Since the grooves between the tube turns of the contact material of the Ikih J coil 11 are filled
with the rack 12, the contact surface with the magnetic liquid forms a smooth surface. In the
case of liquid, a narrow surface i (a force or grade having a slight viscosity or a binding agent) is
used in the form of a liquid.
4. Brief description of the drawings ?1 is a schematic cross-sectional view of a transducer device
for a dynamic bass speaker having a non-inventive 41 coil, the second section 1 and the second
31 and the second 1 are two of the forensic coil according to the present invention It is a figure
which shows another laugh example. EndPage: 21 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и misery liquid, 5 и и cone shape IJ '749. z6 и и central hemisphere, 7 и и и sheet, 8.10 ░ 11 и и
vibration coil, 9 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
support coil support b112 и и rack Shunshiro Kishito Attorney Yano Toshio,-\ 7 EndPage: ?
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description, jps5451519
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