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JPS5192617

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DESCRIPTION JPS5192617
3 Patent applicant address Osaka Prefecture Kadoma city Ogata Kamon 100 name (582)
Representative of Matsushita Electric Industrial Co., Ltd. Shoji Matsushita 4 Agent ? 517 Osaka
Prefecture Kadoma city Osamu Kadoma address 1006 -926 170 published Japanese Journal 51.
(1976) 8.13 Agency Serial Number,, A, '1', the title of the invention
Electromagnetic type converter
3. Detailed Description of the Invention The present invention is an electromagnetic transducer
in which a portion of LIE flow flux generation by permanent ai 'E and a portion of signal flux
generation by coil are separated into upper and lower portions with a diaphragm interposed. The
magnetic circuit of the present invention is directed to increasing the sensitivity as a converter.
An embodiment of the present invention will be described below with reference to the attached
drawings. FIG. 41 is an example of a general structural view of an electromagnetic transducer
according to the present invention. In FIG. 1, reference numeral 1 denotes a permanent magnet,
which is fixed to the inner central portion of the lower magnetic yoke 2 for passing a DC flux to
the outer peripheral portion. A pole piece 3 is fixed on the upper part of the permanent magnet 1
and a pole plate 4 is fixed and placed on the upper surface of the pole piece 3. In the outer
peripheral portion of the magnetic 1B, a shelf-like step 6 is provided, and on this step 6, a spacer
/ bar-like spacer 6 made of a nonmagnetic material is fitted. An armature 14 made of a disk-like
magnetic material is supported under tension by an fR'Nb plate ring 7 made of a non-g & a main
vibrating plate 16. An upper magnetic type 9 waits for a convex magnetic pole 1 ░ at its central
portion, and a coil 11 is inserted in the periphery of the magnetic pole 10 and fixed by adhesion
or the like. The lead d113 from the coil 11 is connected and fixed to the terminal plate 12
through the terminal hole 13 /. A sound hole pipe 8 for EndPage: 1, which leads the old, is
inserted, crimped, or bonded to a part of the circumference q of the upper magnetic yoke e.
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Hereinafter, the operation of the electromagnetic transducer according to the present invention
will be described with reference to the case of an electric-static machine. In FIG. 1, when a signal
current is externally supplied to the cardiac terminal 12, a signal magnetic flux ? is generated
inside the magnetic pole 10 in proportion to the magnitude of the signal current. The signal
magnetic flux ? M passes horizontally through the air gap from magnetism 1 o to the armature
14, 9 and the inside of the armature 14 as shown by the point 4 at the first IN, and the step 6 of
the lower air cell 2 After passing through the peripheral portion of the lower magnetic yoke 2, it
passes through the upper magnetic section Y to the upper market section Y of the upper
magnetic yoke 9 again. On the other hand, a part of the direct current magnetic flux ?X
generated from the permanent magnet 1 passes the armature 14 vertically, and the upper
magnetic pole 10. After passing through the periphery of the lower magnetic yoke 2 and the
periphery of the lower magnetic yoke 2 in this order, it reaches the other side of the permanent
magnet 1 again. The other part of the DC magnetic flux ?Dc passes from the permanent magnet
1 to the armature tool 14 and passes horizontally through the inside of the armature 14, and
then passes through the step portion St-and the peripheral portion of the lower magnetic pole 2
Pass through to reach the other pole of the permanent magnet 1.
The other part of the DC magnetic flux ?DC leaves the permanent magnet 1 and passes
horizontally through the pole plate 4 and passes through the peripheral portion of the lower
magnetic yoke 2 and reaches the other pole of the permanent magnet ?1 again. . In the portion
where the signal magnetic flux ?AC and the DC magnetic flux ?X overlap each other, The
vibration driving force proportional to the signal current will work. Therefore, in FIG. 1, in
proportion to the signal in the gap between the upper 'Jdi pole 10 and the armature 14 and in
the gap coarseness between the armature 14 and the lower magnetic yoke 20 step 6, Driving
force is generated. FIG. 8 is an enlarged view of a portion where signal magnetic flux ?AO-DC
magnetic flux ? addition overlaps each other. In FIG. 3, the driving force generated between the
armature tool 14 and the upper magnetic pole 1o and the driving force generated at the opening
of the armature 14 and the step 6 are exactly the same. Ili1 phase], because both drive force
work on both of 6-armature 14, these of these! @ Driving force The driving force acts on the
driving plate 16 in mutually reinforcing directions. This means that the vibration / provision 16
is operated in a push-pull manner between the magnetic poles, and has the advantage that a
large driving force can be obtained and high-order distortion can be reduced. In this manner, the
diaphragm 16 including the armature 14 acts on the driving force proportional to the signal
current supplied to the terminal 12 in a direction in which the driving force in proportion to the
signal current is reinforced mutually from both the upper surface central portion and the lower
surface peripheral portion. It will be Due to the vertical movement of the vibration wJ plate 16,
the atmospheric pressure fluctuates inside the air chamber at the upper part of the diaphragm
16, and the ninth sound hole pipe 8 leading to the outside as the sound pressure is the upper
magnetic yoke 9. It is provided in a part of the surroundings. In the structure of the embodiment
shown in FIGS. 11 and M3, since the stepped portion 6 is formed, the internal focusing volume of
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the lower magnetic field 2 is narrowed at the peripheral portion, so that the air chamber is
formed. The acoustic stiffness shown by is large, and it interferes with the vibration plate 16 at
the top and bottom. FIG. 2 shows another embodiment for realizing the concept according to the
present invention. In FIG. 2, as a device corresponding to the step gA and the like provided in FIG.
1, a shelf plate 6 'made of a ring-shaped magnetic body is provided. 1 is completely the same as
the step 6 of FIG. 1 and therefore the description thereof is omitted, but in this structure, the air
chamber 8 inside the lower magnetic yoke can be widely obtained, so that the acoustic stiffness
exhibited by the air chamber is obtained. Therefore, the movement of the diaphragm 16 is less
likely to be impeded, and the feeling as a body movement converter can be made high.
The punishment, here, will be described as an ij air-f-resonance converter: One-order can also
operate as a '# 11-air-warmer. As described above, the first feature of the present invention is
that the moving plate is driven in opposite phase from both the upper and lower magnetic yokes
and the central portion around the lower magnetic yoke, so the sensitivity as a converter is high.
It is to be obtained. It is balanced with respect to direct current magnetic flux, and operates as
both 1R1 motions with respect to the g driving force. 1, and EndPage: 2 sensitivity is high, and
even-order vibration can be reduced. . Furthermore, in Q'4 as shown in FIG. 2, the inner volume
of the lower magnetic yoke can be increased, and the back volume stiffness to suppress the
movement of the stirring plate can be reduced. The second feature is that only one coil, two
permanent magnets, and two coils are required as the main components of the ? ? fi fi
converter. This kernel can reduce the material cost and the assembly time, and helps to reduce
the price as a product. Thus, in the electromagnetic converter according to the present invention,
the main part operates as a balanced type with only one piece, and has a feature of the balanced
type as well as practical price and ease of assembly as a product. It is of great value.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view for explaining the structure of
an electromagnetic transducer according to an embodiment of the present invention, and FIG. 2
is an electromagnetic transducer according to another embodiment of the present invention. In
order to show the structure, FIG. 3 and FIG. 4 are enlarged views for enlarging a part of the
structure in FIG. 1 and for explaining how the magnetic flux passes. DESCRIPTION OF SYMBOLS
1 иии Permanent magnet, 2 и и и и и и и Lower magnetic yoke 3e и и и 1 pole piece, 4 и и и и magnetic [&, 6
и и и ░ step portion sf 5 '@ aes ++ shelf Plate, 9: Upper magnetic yoke, 10: Magnetic pole, 11:
Tocoil, 14: Armature, 16: Diaphragm. Name of agent Attorney Nakao et al. 1 person Fig.1 Fig.2
Fig.3 Fig.1 EndPage: 36 Attorneys other than the above Address address in Osaka Prefecture
Kadoma city Oda Kadoma 1006 EndPage: ?
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