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JPS60497

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DESCRIPTION JPS60497
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a buzzer in which a diaphragm is vibrated by magnetic interaction
between an electromagnet and a permanent magnet provided to surround the electromagnet.
Prior Art FIG. 1 shows a conventional example of such a buzzer. As shown in the drawing, the
conventional buzzer makes the iron core 2 on which the coil 1 is wound erected on the diskshaped yoke 3 and causes the cylindrical permanent magnet 4 to be magnetically attracted to the
outer peripheral edge of the yoke 3. Further, the ring-shaped spacer 5 and the magnetic metal
diaphragm 6 having the weight 7 attached to the center thereof are sequentially stacked on the
open end 4a of the permanent magnet 4, which has the following disadvantages. (A) The
vibrational motion of the diaphragm 6 depends on the distance of the air gap G1 formed between
the diaphragm 6 and the tip surface of the iron core 2. Therefore, it is necessary to manage the
distance of the air gap G1 so as not to cause variation in each buzzer. However, with the
structure shown in FIG. 1, processing errors of the yoke 3, the permanent magnet 4 and the
spacer 5 and assembly errors on the contact surfaces of the parts are accumulated, so the
position of the diaphragm 6 is not constant. The distance of the air gap Gl floats by the buzzer,
and variations in sound quality, volume and the like occur. For this reason, conventionally, as
shown in FIG. 1, the iron core 2 is screwed onto the yoke 3 or the yoke 3 is screwed onto the
permanent magnet 4 and the screwing amount is adjusted to adjust the distance of the air gap
G1. It is essential to set the to a predetermined value. However, the distance of the air gap G1 is a
minute value of about 100 ± 10 rivers at most, and it was not always easy to set the air gap G1
to a predetermined value even using the above-mentioned adjusting means. Moreover, if the
structure is as described above, the yoke, 3. Since the iron core 2 or the permanent magnet 4
must be screwed, the number of processing steps is increased and the cost is increased. (C) The
iron core 2, the yoke 3 and the permanent magnet 4 must be separately manufactured by
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machining a heavy magnetic metal material, etc., so that the number of processing steps
increases, and the weight and shape of the entire buzzer are large. It leads to the formation. Since
this type of buzzer is used by incorporating it into a small device such as a pager or a watch, it
must be made as lightweight and compact as possible, and conventional buzzers are sufficient to
meet this requirement. Can not respond-can not. (D) The buzzer shown in FIG. 1 is normally used
by being inserted into an outer case made of nonmagnetic material such as synthetic resin, but
the outer surface of hard permanent magnet 4 made of metal material or yoke 3 is used. A gap is
likely to occur between the and the outer case. As a result, so-called "beat sound" occurs during
the sound generation operation, and the vibration sound quality is deteriorated.
OBJECTS OF THE INVENTION It is an object of the present invention to provide a method of
cleaning the above-mentioned conventional drawbacks and manufacturing a lightweight,
compact, inexpensive, high-performance buzzer which can control the gap between the
diaphragm and the core with high accuracy. To aim. In order to achieve the above object of the
present invention, the present invention provides an electromagnet, a yoke of the electromagnet,
a permanent magnet provided on the yoke so as to surround the electromagnet, an iron core of
the electromagnet, and an air gap. A buzzer is manufactured which has a diaphragm opposite to
each other and a support surface for supporting the diaphragm and is formed in a bottomed-like
shape, and has a nonmagnetic storage case in which the electromagnet, the yoke and the
permanent magnet are disposed at the bottom. In this case, the iron core of the electromagnet is
integrally erected on the bottom of the storage case by molding, and a portion of the protrusion
protruding from the rear end of the iron core during molding is the one with respect to the
support surface. In order to keep the position of the end face of the iron core constant, it is
characterized in that it is crushed between the two molds for mold formation. Embodiment FIG. 2
is a cross-sectional view of a buzzer obtained by the manufacturing method according to the
present invention, and FIG. 3 shows an exploded view thereof. In the figure, reference numeral 8
denotes a storage case formed in a bottomed cylindrical shape using a nonmagnetic material
such as a synthetic resin. An annular step 8 a is provided at the upper opening end of the storage
case 8. 9 is an iron core on which the coil 10 is wound. The iron core 9 is erected on the body
substantially on the axis of the bottom 8 b of the storage case 8. The position of the tip end face
9a of the iron core 9 is determined to be lower than the step 8a by the height G2. The storage
case 8 and the iron core 9 are integrally molded, but the details will be described later. 11 is a
printed circuit board. The printed circuit board 11 is formed in a disk shape having a diameter
slightly smaller than the inner diameter of the storage case 8, and the iron core 9 is inserted into
the center hole 11 a thereof and installed on the bottom 8 b of the storage case 8. 12.13 is a lead
terminal mounted on the printed circuit board it. 14 is a washer made of a magnetic material. 7
The washer 14 is formed in a disk shape having substantially the same diameter as the printed
circuit board 11. The iron core 9 is inserted into the center hole 14 & is inserted into the storage
case 8 and superimposed on the printed circuit board 11 is there. Notches 14 b-14 d are
provided in the peripheral portion of the washer 14 so as to form a relief for the lead terminal
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12.13 when stacked on the printed circuit board 11. The coil 10 of the core 9 is wound around
the core 9 after the printed circuit board 11 and the washer 14 are inserted into the storage case
8. The lead wire of the coil 10 is guided in the direction of the printed circuit board 11 through
the notch 14b or 14d of the washer 14, and after the kerfs (11b, 11C), (11d, 11e) are wound
around the printed circuit board 11, It is soldered to terminal 12.13 or batan.
15 is a cylindrical permanent magnet. The permanent magnet 1 is provided on the washer 14
while being fitted in contact with the inner peripheral surface of the storage case 8 so as to
surround the electromagnet consisting of the iron core 9 and the coil 10. The tip end surface 15
a of the permanent magnet 15 is defined to be lower than the step 8 a of the storage case 8 by
the height G 3. The permanent magnet 15 may be a metal permanent magnet, but a magnet
made of an elastic magnetic material such as a rubber magnet or a resin magnet is more
preferable. Because it is flexible and resilient when it is a rubber magnet or resin magnet, it can
be easily pushed into the storage case 8 even if it is manufactured to a diameter slightly larger
than the inner diameter of the storage case 8 and its own elastic force after insertion. As a result,
it is in close contact with the inner peripheral surface of the storage case 8 without forming a
gap, and generation of a rattling noise is prevented. A diaphragm 16 is a thin disk-shaped
magnetic metal plate or the like. The diaphragm 16 supports the annular step 8a of the storage
case 8 as a support surface. As described above, the step 8a is higher than the end surface 9a of
the core 9 by the height G2 and higher than the end surface 15a of the permanent magnet 15 by
the height G3. Therefore, in the state where diaphragm 1'6 is supported by step 8a, between the
lower surface of diaphragm 16 and tip surface 9a of iron core 9 and tip surface 15a of
permanent magnet 15 in accordance with the respective height differences. Thus, the air gaps G2
and G3p are formed. Due to the presence of the gap G3, the gap G2 between the tip surface 9a of
the iron core 9 and the diaphragm 16 depends on the support surface of the diaphragm 16 in
the storage case 8, that is, the position of the tip surface 9a of the core 9 with respect to the step
8a. The processing error and assembly error of the printed circuit board 11, the washer 14 and
the permanent magnet 15 are in a collection relationship. That is, in the buzzer according to the
present invention, the distance of the most important gap G2 in this type of buzzer can be
obtained only by managing the position of the tip surface 9a of the iron core 9 with respect to
the step 8a of the storage case 8 in a predetermined relationship. It can be easily maintained at a
constant value. And, making the gap G2 uniform can be easily achieved by integrally molding the
storage case 8 and the iron core 9 together. FIGS. 4 (A), (B), (C) and (D,) are specific explanatory
views of molding. In the figure, A is male and B is female. The male mold A is provided on the
outer periphery thereof with a step 8'a corresponding to the step 8a of the storage case a, and at
the center thereof is provided with a recessed groove 9 'into which the iron core 9 is inserted.
The axial distance between the bottom surface 9'a of the recessed groove 9 'and the lower
surface of the step 8'a is set to be substantially equal to the gap G2.
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Further, a projection 9b is provided at the rear end portion of the iron core 9 so as to have a
crushing point which is crushed between the male mold A and the female mold B at the end of
the projection 9b. That is, when the position of the bottom surface C of the female die B when the
end faces a and b of the male die A and the female die B are brought into holding contact with
each other in FIG. The projection 9b of the iron core 9 inserted in the recessed groove 9 'so as to
contact the groove bottom 9'a, so that the length sentence projects beyond the position C' in the
direction of the female mold B, This length look is taken to be the above-mentioned squash.
Therefore, in a state in which iron core 9 is inserted into recessed groove 9 ', when male mold A
and female mold B are pushed forward until end faces a and b press against each other, iron, the
protrusion 9b of Q9 is of recessed groove 9'. The pressing force applied between the bottom
surface 9'a and the bottom surface C of the female die B causes the length to be seen and
crushed. (FIG. 4 (B)). In this case, since the tip end face 9a of the iron core 9 is held down by the
bottom face 9'a of the recessed groove 9 ', a predetermined distance from the step 8'a
corresponding to the support face of the diaphragm 16 It will be maintained at G2. Next, after
molding is performed by injecting a synthetic resin from the injection port d (FIG. 4 (C)), the male
A and the female B are separated from each other, and the iron core 9 is integrally molded to the
bottom 8b of the storage case 8. The resulting molded product is obtained (FIG. 4 (D)). According
to the above-described mold molding, the position of the tip end surface 9a of the iron ILJ 9 with
respect to the step 8a of the storage case 8 which is the support surface of the diaphragm 16 can
be set within the error range determined by the mold. Can be managed with high accuracy.
Further, since the projection 9b is provided at the rear end portion of the iron core 9 and a part
of the projection 9b is crushed during molding, the processing error of the iron core 9 can be
absorbed at the portion of this crushing. Therefore, the processing accuracy of the iron core 10
may be relatively rough, which contributes to the reduction of the processing cost. As described
in detail above, according to the present invention, an electromagnet, a yoke of the
electromagnet, a permanent magnet provided on the yoke so as to surround the electromagnet,
and an iron core of the electromagnet are opposed via a gap. In the case of manufacturing a
buzzer including a diaphragm and a nonmagnetic storage case having a bottomed cylindrical
shape having a support surface for supporting the diaphragm and having the electromagnet, the
yoke, and the permanent magnet at the bottom The iron core of the electromagnet is integrally
erected on the bottom of the storage case by molding, and a portion of the protrusion protruding
from the rear end of the iron core during molding is the iron core against the support surface. In
order to keep the position of the tip end face constant, it is characterized by crushing between
the two molds for molding, so the following effects can be obtained.
(A) The accuracy of the air gap between the diaphragm and the iron core is within the error
range of the mold for molding. Therefore, it is possible to provide a high quality buzzer with very
high air gap accuracy. (B) There is very little variation in air gap accuracy in each buzzer.
Therefore, it is possible to inexpensively manufacture a buzzer which is constant in high quality
and excellent in mass productivity. (C) The processing error of the iron core can be absorbed by
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the squash provided on the iron core. Therefore, the processing accuracy of the iron core may be
relatively rough. As a result, the processing cost of the iron core can be significantly reduced, and
the cost as a whole of the buzzer can be significantly reduced. (D) A small, lightweight buzzer can
be provided. (E) It is possible to provide an inexpensive buzzer that is easy to handle, eliminating
the need for an air gap adjustment mechanism.
[0002]
Brief description of the drawings
[0003]
1 is a sectional view of a conventional buzzer, FIG. 2 is a sectional view of a buzzer obtained by
the manufacturing method according to the present invention, FIG. 3 is an exploded view thereof,
and FIGS. 4 (A) to 4 (D) are molds. It is explanatory drawing of shaping ¦ molding.
8 · Fist · Storage case 9 · Fight · Iron core 9b-· · · · · · · · · · · · 14 · · Washer 15 fight · · permanent
magnet 16 · · · diaphragm ji4vA (A) (C) (D)
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