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JPS57144000

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DESCRIPTION JPS57144000
Description 1, title of the invention
f General-purpose JIII device 2, ffff claim (in the acoustic transducer that vibrates the diaphragm
facing the IIO and 11L magnets through the air gap by the magnetic interaction between the 11
electromagnets and the permanent magnet , About the iron core of the distribution
electromagnet, to be provided to surround the pre-distribution permanent magnet 'Ik: featuring
sound * change mourning device.
3. Detailed description of the invention In the non-invention, the imaging IET III facing the
electromagnet and the air gap by magnetic interaction between the electromagnet and the
permanent magnet! The present invention relates to an electromagnetic sound I1 converter that
is adapted to vibrate. Since various types of acoustic transducers can be made smaller and
cheaper than other sound transducers such as the piezoelectric type, and their back color
adjustment is easy, various kinds of watches, microwave ovens or recently A 6M1 figure that has
become widely used as a sound recording confectionery for calculators and the like shows a
conventional example of a sound 411 converter of a kind, and the bottom of the cylindrical outer
cylinder 1 made of nonmagnetic metal material etc. In addition, heat the heat of the iron core 3t
with the coil 2 / with the fork rj 4 by adhesion or the like, and inside the outer cylinder 1 on the
holding number 4 (: electromagnet consisting of coil 2 and iron core A cylindrical permanent
magnet 5 is disposed so as to surround it, and a gap G1 relative to the end face 6a of the iron
core 3 is provided in EndPage 1 in the step 1a provided on the end face of the upper opening of
the outer cylinder 1 It has a structure with a frequency of 2Y mounted on the opposite side of
the disk through 2 Which is the core 5 facing ? Ru position two losses with the Palast today 6.
When an alternating current or pulse current of excessive frequency is supplied to the coil 2 in
the tone change S unit of the above structure, the magnetic mutual relation between the
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alternating magnetic field generated at this time and the DC bias magnetic field of the permanent
magnet 5 is generated. Due to the action and frequency 69 spring property, one diaphragm plate
6 vibrates in the air gap 01 circle depending on the frequency of the coil current, and a good
vibration sound per ear is obtained 5 n ? ? ? However, this conventional all 11 converter C2
had the following drawbacks. (1) First, since the permanent magnet 5 is disposed around the
electromagnet 2.3 and the permanent magnet 5 is supported by the inner peripheral surface of
the outer cylinder 1, the outer cylinder 1t-nonmagnetic material is 1111 ri. If the outer cylinder
1 whose magnetic body must be 0 is a magnetic body, the DC magnetic field of the permanent
magnet 5 is short-circuited by the outer cylinder 1 and the DC bias magnetic field for the
vibration & 6 is almost eliminated. It is because it loses its function. Therefore, the magnetic path
(i) for the magnetic flux generated in the electromagnet 2.3 is divided by the outer cylinder 1
made of nonmagnetic material, the magnetic efficiency of the magnetic path (i) is low, and the
sound pressure is large. There was a drawback that it could not be taken. Q) Since the DC bias
magnetic field for frequency 6 changes depending on the outer diameter, inner diameter and
axial length of permanent magnet 5, these dimensions should be set with high precision to obtain
constant sound pressure and timbre vibration noise. However, the permanent magnet 5 needs to
be formed in a cylindrical shape in order to position the electromagnet 2.3 in the inner diameter
portion of the permanent magnet 5, and it is composed of a sintered body of a ferrite magnet or
a rare earth cobalt magnet. It is very difficult to obtain permanent magnet 5 with high
dimensional accuracy, which causes deformation, distortion and reduction of roundness in the
forming and firing steps. Conventionally, the outer periphery of the permanent magnet 5,
thickness, f!
Although t ? ? was polished up to the inner circumference, there is a problem that the
permanent magnet 5 is made of a sintered body and is very brittle, so chipping or cracking may
occur during the polishing process. , Polishing process was difficult. In particular, the inner
circumference was very difficult to grind and the inner diameter accuracy was hard to achieve. In
addition, the polishing cost greatly exceeded the material cost, and as a result, the product
became quite expensive. (4) Recently, the use of an IC or the like as a drive circuit has become
mainstream, and a large number of pulses are used as a drive current. Therefore, usually, the
direct current resistance of the acoustic transducer is designed to be large. However,
conventionally, the electromagnet 2.3 is positioned within the inner diameter portion of the
permanent magnet 5, and the diameter of the iron core 5 and the winding diameter of the coil 2
can not be reduced, so the DC resistance component of the coil 2 is increased. It was impossible
to do so, and it was necessary to take measures such as connecting an external resistance to the
coil 2 to raise the direct current and resistance. The present invention eliminates the abovementioned conventional defects, increases the magnetic efficiency of the magnetic path for the
magnetic flux generated in the electromagnet, raises the sound pressure level, improves the size
of the permanent magnet, improves processing ease and costs. In order to achieve the purpose, it
is intended to provide an acoustic transducer in which the DC resistance component of the coil is
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increased and the external resistance is not required. In the sound w converter which vibrates the
frequency opposite to the electromagnet through the air gap by the magnetic interaction 'with
the magnet, the iron core of the front' distribution electromagnet is provided so as to surround
the permanent magnet. It is characterized by The contents of the non-invention will be
specifically described with reference to the accompanying drawings as the embodiments. Fig. 2
(9) is a front sectional view of the acoustic transducer according to the non-invention.-In the
figure, the same reference numerals as in Fig. 1 indicate functionally identical components-as
illustrated In the present invention, the positional relationship between the electromagnet and
the permanent magnet 5 is reverse to the conventional positional relationship, that is, the iron
core 3 constituting the electromagnet is provided to surround the permanent magnet 5 in this
embodiment. The iron core 3 is formed in a cylindrical shape, and the coil 2 is wound around the
outer periphery thereof to constitute an electromagnet, and a columnar permanent magnet 5
fitted in the circular shape is inserted into the inner diameter portion 5a of the iron core 3.
EndPage: 2 Iron core 3 is basically formed in a cylindrical shape such as a cylindrical shape as
shown in this embodiment, but a plurality of divided pieces are arranged on the same
circumference on the support plate 4 You may Also, the iron core 3 may be integrally formed
with the support fi 24 or one formed separately from the support plate 4 may be connected on
the support plate 4 by means such as adhesion, welding or screwing. As described above, in the
non-invention, since the permanent magnet 5 is separated from the outer cylinder 1, the outer
cylinder 1 can be made of a magnetic material.
For this reason, a magnetic path for the magnetic flux generated in the electromagnet, a path (as
shown in the sub-section, an outer cylinder 1-frequency 6-iron core 3 which is a support & a
magnetic body is a magnetic body) The sound pressure level can be raised, and the path 1 / ? is
the magnetic path of the permanent magnet 5. In addition, since the permanent magnet 5 does
not have to be formed in a cylindrical shape such as a daily shape, it can be formed in a simple
columnar shape, so that the forming and firing error is small, and the permanent magnet 5 with
high dimensional accuracy can be obtained. It becomes. In addition, even when the metal for
polishing is processed to improve the dimensional accuracy of the permanent magnet 5, it is not
necessary to carry out the hard inner circumference grinding, so that the grinding accuracy can
be increased and the processing cost can be reduced. Furthermore, since the outer diameter of
the iron core 3 and the winding diameter of the fill 2 are not limited by the inner diameter of the
permanent magnet 5 but are enlarged, the DC resistance component of the coil 2 is increased
with a small number of turns, It is possible to omit the external resistance, reduce the number of
parts, and simplify the circuit configuration. As described above (2, in the non-invention, in the
acoustic transducer in which the frequency of opposing the electromagnet and the permanent
magnet via the air gap is oscillated by the magnetic interaction between the electromagnet and
the permanent magnet, the iron core of the electromagnet is Since the permanent magnet is
provided so as to surround the permanent magnet as II #, the magnetic efficiency of the
magnetic path for the magnetic flux generated in the electromagnet is islanded, the sound
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pressure level is increased, and the dimensional accuracy of the permanent magnet is improved
and processing is facilitated. Further, it is possible to provide an acoustic transducer in which the
DC resistance of the coil is increased to facilitate the design amount of the drive circuit.
4. Brief Description of the Drawings FIG. 1 is a front sectional view of a conventional
electromagnetic acoustic transducer, and FIG. 2 is a front sectional view of a non-inventive
telecommunication transducer. 1 иии Outer cylinder 2 и и и Coil 3 и и и Iron core 5 и и и Permanent
magnet 6 и и и Frequency Figure 1 Voice 2 Figure EndPage: ?
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