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JPS55118300

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DESCRIPTION JPS55118300
Description 1, title of the invention
Speaker device
3. Detailed Description of the Invention The present invention relates to a speaker apparatus
having a large input resistance that rapidly emits the heat generated when an input current flows
through a voice coil to the outside. In the conventional speaker device, the heat radiation path
from the voice coil to the outside of the voice coil is transmitted from the voice coil to the yoke or
the plate through the air layer existing between the gaps first, and the outer periphery of the
speaker Thus, the heat is dissipated to the outside. However, since air, which is a heat insulating
material, has only a thermal conductivity 3 to 4 orders lower than that of metal, the heat
generated by the voice coil portion is not easily transmitted to the yoke or the metal portion of
the center ball, and dissipates heat to the outside. It was difficult. Therefore, at the time of large
input, the voice coil is easily damaged due to temperature rise, which has been a large obstacle to
increasing the input of the speaker device. In general, for example, in a small high-pitched
speaker device with a voice coil, this effect is significant, and continuous input is suppressed to
about 10 W in a general commercial product. It can be seen that the value is very small,
considering that 1 o OW amplifiers are now widely used in ordinary homes. As a means to
release the generated Joule heat of this voice coil to the outside, a large input type speaker with
EndPage: 1 filled with magnetic fluid is put into practical use in the gap of the magnetic circuit
where the voice coil is placed). ing. The liquid has a thermal conductivity that is about one digit
better than that of air, which is a gas. Therefore, as a matter of course, the thermal resistance due
to the thermal conduction between the voice coil and the yoke or the center ball is lowered, the
heat radiation to the outside is increased, and the input resistance is improved. However, the
magnetorheological method is generally not widely spread with the problems, such as
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temperature characteristics due to evaporation, scattering, and viscosity of the magnetic fluid,
and since the magnetic fluid is fixed by the magnetic field, convection is caused. The heat
dissipation effect due to According to the present invention, as a means for lowering the thermal
resistance between the voice coil plates described above, the speaker is airtightly sealed, and the
sealed container configured to include the voice coil has a better thermal conductivity than air,
eg helium And hydrogen are sealed to reduce the thermal resistance of the voice coil and the
plate. Based on the following drawings
Speaker device
The present invention will be described in detail. FIG. 1 is a cross-sectional view of the first
embodiment, which is axially symmetrical. 1 is a bobbin on which a voice coil 2 is wound and a
dome shaped cone made of an airtight material such as metal, "N", "l-13" and an edge portion 4
are formed on the front '-8, blade portion. The reference numeral 6 denotes a magnet having a
plate 7 on the front and back in which a magnetic material such as iron is present as well as a
yoke 6 made of a magnetic material. Reference numeral 8 denotes a sealed container completely
shut off from the outside air by the dome cone 3 and the edge portion 4, and a filling pipe 9
penetrating the yoke 6 is opened. Reference numeral 10 is a wire for supplying current to the
voice coil. Next, the operation will be described. The edge 4 and the plate 7 are joined by welding
or the like, and the space between the magnet 5 and the plate 7 and the yoke 6 is completely
sealed with a small molecular bond. The airtightness of 8 is extremely high. After filling a gas
having a large thermal conductivity such as helium into the inside of the closed container 8 using
the 封入 filling tube 9, the mouth of the filling tube 9 is closed. The inside of the closed container
8 including the voice coil 2 of the manufactured speaker device of the present invention is
completely filled with helium according to the above procedure. In this state, when an input
current is applied to the speaker, the Zeehl heat is generated in the voice coil 2 and transmitted
to the rate 7. The thermal resistance of the plate 7 made of metal is much lower than that of gas,
and the generated heat is quickly released to the outside. When using helium as the fill gas of the
present invention, the edge? Thermal conductivity [email protected] J/[email protected] is five times
that of air [email protected] Therefore, the thermal resistance between the voice coil and the
plate is simply% when considering only thermal conduction. 0. When using oil as the solvent for
the magnetic fluid, the thermal conductivity of the magnetic fluid is the thermal conductivity of
the oil. For example, the thermal conductivity of transformer oil is 1.36 × 10, which is smaller
than that of helium. The thermal conductivity of other oils is also not much different from that of
helium. Therefore, it has a thermal resistance, ie, a heat radiation effect comparable to that of the
current magnetorheological speaker. Also, since a gas is used, viscosity is much smaller than that
of liquid, so there is no temperature characteristic due to viscosity. In addition to heat
conduction, heat transfer by convection is also added in addition to heat conduction, and the heat
radiation effect is further enhanced. Next, a second embodiment of the present invention will be
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described based on FIG. FIG. 2 is a cross-sectional view of the second embodiment. In FIG. 2, 1 to
1 are the same components as those of the first embodiment, and 11 is a two-part structure,
which is an enclosed back cover made of metal or the like welded to the plate 7 and enclosed. A
tube 32 is attached.
The reference numeral 13 denotes a lead wire for supplying current to the voice coil, which is
pulled out to the outside through the air hole 14 provided in the yoke 6 and the back cover 11.
15 shows the inside of the sealed container increased by the back cover 11. An outer wall of the
closed container 15 includes four points of the outer wall + d dome shape cone 3, the edge 4, the
plate 7 and the back cover 11, and there are three joints. Among them, when the dome-shaped
cone 3 and the edge 4 are formed as one piece, the joint portion is at two places, and joining by
welding or the like is also possible, and high airtightness is maintained. Therefore, when helium
is sealed, each member of Helium Bivalve Jiu-Ji, 1-, 1-, 1-to-1 pays through n-no + Yu- I-work
1141-year-old female excerpt EndPage: 2 through the adhesive part It is not necessary to
consider the risk of leaking to the outside. Therefore, this second embodiment provides an inputresistant speaker device with better aging characteristics, and has the effect of facilitating
manufacture. As described above in detail, the speaker device according to the present invention
can not only obtain the heat radiation effect of the conventional method, but also can remove the
temperature change and the aged deterioration, which are the conventional defects, It turns out
that it has an excellent effect that the manufacturing method does not change and the cost is not
high. Although the dome-shaped speaker is used as an example, the present invention can be
easily applied to a conical cone-shaped speaker, and the effect may be changed by using a low
thermal resistance gas 2 other than helium, for example, hydrogen as the gas. It is also powerful
to say that there is nothing.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional side view of a speaker apparatus
according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a
speaker apparatus according to an embodiment of the present invention. \ \ 1 · · · · · · · · · · · · · · · ·
voice coil, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ...) Plate, 8 ... sealed container, 9,
12 ... enclosed tube, 11 ... back cover, 15 ... sealed container. Name of agent Attorney Nakao
Toshio and others 1. One, two-Fig. 1 Fig. 2 EndPage: 3
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