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JP2001051682

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2001051682
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
buzzer for an alarm widely used in mobile phones and other electronic devices.
[0002]
2. Description of the Related Art Conventionally, as a buzzer mounted on a small electronic
device such as a portable telephone or a pager, for example, one having a thin structure as
shown in FIG. 12 is known. In this buzzer 1, a flat plate-like yoke 3 is fitted in the bottom recess
of the cup-shaped lower case 2a, and the coil 5 is wound around an iron core 4 integrally
projecting at the center of the yoke 3 by drawing. A magnet 6 is magnetically attached to the
yoke 3 at the outer periphery of the coil 5, and the ring 8 is mounted on the outer periphery of
the magnet 6 so as to press the flat portion 7 of the yoke 3. It is what was put. A weight 10 is
attached to the back surface side of the diaphragm 9, and a gap 11 is provided between the
lower surface of the weight 10 and the upper surface of the iron core 4. The upper case 2 b is
placed on the diaphragm 9, and the outer peripheral edge of the diaphragm 9 is held between
the upper case 2 b and the upper surface of the ring 8 to position the diaphragm 9. In such a
buzzer 1, an alternating current flows in the coil 5 to generate an alternating magnetic field in
the iron core 4, and the diaphragm 9 vibrates with the upper surface of the iron core 4 to
resonate and emit a buzzer sound.
[0003]
03-05-2019
1
By the way, in the manufacturing process of the above-mentioned yoke 3, since the iron core 4 is
integrally protruded from the central portion of the flat portion 7 by drawing processing with a
progressive press, As shown in FIG. 13, the annual ring-shaped shock line 12 is formed in the
final stage of the drawing process, and the waved shape remains on the flat portion 7 or the
thickness of the flat portion 7 varies and the height dimension of the iron core 4 Was not stable.
Therefore, when the ring 8 is placed on the flat surface portion 7 of the yoke 3, variations in the
thickness of the shock line 12 and the flat surface portion 7 have an adverse effect, and the
upper surface height of the ring 8 is not stabilized. Since the gap 11 between the diaphragm 9
and the iron core 4 mounted on the upper surface of the core 8 can not always be kept within a
uniform dimension value, the timbre when the buzzer sounds may vary depending on the
product, and the timbre Could not manage. Moreover, since the height dimension of the iron core
4 is not stable, in addition to affecting the height dimension of the coil 5 attached to the iron core
4, the adhesion between the coil 5 and the yoke 3 is not sufficient, and the resonance amount is
stable. There was also a problem of not doing.
[0004]
Therefore, it is an object of the present invention to eliminate the shock line formed on the flat
portion of the yoke and to make the thickness of the flat portion uniform to ensure the
smoothness of the flat portion, thereby placing the vibration on the ring upper surface. The gap
between the board and the iron core is always kept within a predetermined dimensional value to
eliminate tone variation among products.
[0005]
Another object of the present invention is to stabilize the height dimension of the iron core by
making the thickness of the flat portion uniform, and keep the height dimension of the coil
mounted on the iron core constant. The adhesion to the yoke is also improved, and the timbre
can be managed by stabilizing the resonance amount.
[0006]
SUMMARY OF THE INVENTION In order to solve the above problems, the inventor of the present
invention removes shock lines by press-forming minute recesses in the flat portion of the yoke
and makes the thickness of the flat portion uniform. By ensuring the smoothness of the flat
portion, the gap between the iron core and the diaphragm was always kept constant.
03-05-2019
2
Specifically, according to the invention of claim 1, a flat yoke having an iron core projecting
integrally, a coil and a magnet wound around the iron core, and a ring mounted on a flat portion
of the yoke A buzzer mounted on the upper surface of the ring and provided with a diaphragm
which forms a slight gap with the upper surface of the core, wherein at least one of the upper
surface and the lower surface of the flat portion of the yoke The above-described problem is
solved by the buzzer characterized in that the entire surface is press-formed.
[0007]
According to the present invention, by plastically deforming the minute recess in the flat portion
of the yoke by press molding, the thickness of the flat portion is displaced while the thickness of
the flat portion is canceled by the movement of the wall of the recessed portion. Is equalized.
Therefore, smoothness is ensured in the flat portion of the yoke, and the height dimension when
the ring is placed on the flat portion and the height dimension of the coil when the coil is
mounted on the iron core can be kept constant. Become.
[0008]
According to a second aspect of the present invention, in the buzzer according to the first aspect,
when minute recesses are formed on both the upper surface and the lower surface of the flat
portion, the position of the minute recess on the upper surface and the minute on the lower
surface are It is characterized in that the positions of the recesses are mutually offset.
[0009]
According to the present invention, the amount of movement of the meat is increased by
plastically deforming the minute recesses from both sides, and the movement of the meat is
smoothed by being mutually offset, and the smoothness is further improved.
[0010]
According to a third aspect of the present invention, in the buzzer according to the first or second
aspect, the sectional shape of the minute recess is a V-shaped groove.
[0011]
03-05-2019
3
According to the present invention, since the minute depressions having a predetermined crosssectional area can be formed at a small pressing pressure, no adverse effect is caused by the
press.
The V-shaped opening angle is preferably about 90 degrees.
[0012]
According to a fourth aspect of the present invention, in the buzzer according to any one of the
first to third aspects, the micro recesses are formed in a spiral shape, a concentric shape, or a
radial shape from the center to the outer periphery of the yoke. Grooves or streak-like grooves
formed in a lattice shape.
[0013]
According to the present invention, the minute recesses are uniformly press-formed in the entire
flat portion of the yoke.
[0014]
According to the fifth aspect of the present invention, in the buzzer according to the first or
second aspect, the minute recess is a point-like recess formed in a scattered state or in a state of
being aligned on the entire surface of the yoke. I assume.
[0015]
Also in the present invention, the same effect as that of the fourth aspect can be obtained.
[0016]
According to the invention of claim 6, a step of integrally projecting an iron core at the center of
the flat portion of the yoke by drawing and a minute recessed portion on at least one of the
upper surface and the lower surface of the flat portion by pressing And the step of removing the
shock line formed on the flat portion.
[0017]
According to the present invention, the step of forming micro recesses can be added to the final
03-05-2019
4
step of the progressive pressing step of forming the yoke, and a drastic change of the production
line can be avoided.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a buzzer according to the
present invention will be described in detail below with reference to the attached drawings.
The buzzer according to the first embodiment has a structure similar to that of the conventional
example shown in FIG.
As described above, although the annual ring-shaped shock line 12 is attached to the yoke 3 after
drawing processing of the iron core 4, in the present invention, as shown in FIG. 1 and FIG. The
shock line 12 is removed by forming a spiral micro recessed groove 15 from the center of the
yoke 3 toward the outer periphery.
The micro recessed groove 15 is formed of a groove having a V-shaped cross section, and the
opening angle of the V is about 90 degrees, and the groove depth is about 0.05 to 0.1 mm.
[0019]
As shown in FIG. 3, a punch 16 and a die 17 are used as a method of forming the micro recessed
groove 15. As shown in FIG.
On the lower surface 18 of the punch 16, microprotrusions 19 of a shape corresponding to the V
shape of the microgrooves 15 are spirally provided, and in the die 17, a relief hole 20 for
inserting the iron core 4 of the yoke 3 is opened. There is.
The inside diameter of the relief hole 20 is substantially close to the diameter of the iron core 4.
When forming, first, the iron core 4 of the yoke 3 is inserted into the relief hole 20 of the die 17,
03-05-2019
5
and the upper surface 7 b of the yoke 3 is brought into contact with the upper surface 21 of the
die 17.
At this time, the thickness of the plane portion 7 of the yoke 3 is not uniform, and the shock line
12 is attached to the upper surface 7 b, so the upper surface 21 of the die 17 and the upper
surface 7 b of the yoke 3 are not in close contact.
Then, the punch 16 is lowered onto the die 17 and the flat portion 7 of the yoke 3 is pressed
between the punch 16 and the die 17. By this press molding, micro concave grooves 15 having a
V-shaped cross section are formed in a spiral shape on the lower surface 7 a of the yoke 3, and
along with the press molding of the micro concave grooves 15, the movement of the meat in the
flat portion 7 As the shock line 12 is removed and the thickness of the flat portion 7 becomes
uniform, the upper surface 7b of the yoke 3 abuts on the upper surface 21 of the die 17 in close
contact without any gap.
[0020]
FIG. 4 schematically shows the movement of the meat at the flat portion 7 when the punch 16 is
lowered onto the die 17 and the flat portion 7 of the yoke 3 is pressed between the punch 16
and the die 17. It is shown in. As shown in this figure, when the V-shaped minute recessed
groove 15 is plastically deformed on the lower surface 7a of the flat portion 7, the thickness of
the recessed portion tends to move to the other. At this time, since the upper surface 7b of the
flat portion 7 is in pressure contact with the upper surface 21 of the die 17 and the movement
toward the die 17 is restrained, the wall of the recessed portion moves to the recess 22 formed
by the shock line 12 or the like. When the shock line 12 is removed by filling the depressions 22,
the thickness is generally made uniform by the pressing effect from the vertical direction of the
flat portion 7.
[0021]
The micro recessed groove 15 may be formed on the upper surface 7b or both the lower surface
7a and the upper surface 7b of the flat portion 7. FIG. 5 shows the yoke 3 in which the minute
recessed groove 15 is formed on the upper surface of the flat portion. If it demonstrates using
the code | symbol of the punch 16 shown in FIG. 3 and the die | dye 17, the micro protrusion 19
of the shape corresponding to the micro ditch | groove 15 is provided in the upper surface 21 of
03-05-2019
6
the die 17, and the lower surface 18 of the punch 16 is a smooth surface. By press molding, the
same micro recessed groove 15 can be formed on the upper surface 7 b of the yoke 3, and this
micro recessed groove 15 has the same function and effect as described above.
[0022]
As shown in FIG. 6, when the micro recessed grooves 15a and 15b are formed on both the lower
surface 7a and the upper surface 7b of the flat portion 7, micro protrusions 19 are provided on
both the punch 16 and the die 17 respectively. Alternatively, the micro recessed grooves 15a and
15b can be simultaneously formed on the both surfaces 7a and 7b by pressing in the vertical
direction. In this case, it is desirable that the positions of the minute recessed grooves 15a on the
lower surface 7a side and the positions of the minute recessed grooves 15b on the upper surface
7b side are alternately arranged. This is because the displacement of the plastically deformed
micro recessed grooves 15a and 15b is smoothed by pressing the positions shifted from each
other from both sides, and the filling of the recesses 22 shown in FIG. 4 is further ensured. It is
from.
[0023]
The shape of the micro concave portion is not limited to a spiral shape, and for example, as
shown in FIG. 7, a micro concave groove 23 having a V-shaped cross section concentrically going
from the center to the outer periphery, as shown in FIG. It is also possible to apply the minute Vshaped groove 24 having a V-shaped cross section radially extending from the center, the Vshaped groove 25 having a V-shaped cross section formed on the entire surface as shown in FIG.
The cross-sectional shape of these minute recessed grooves 15, 23, 24, 25 does not necessarily
have to be V-shaped, and may be, for example, U-shaped. Further, as shown in FIG. 10, it may be
a minute recess having a shape in which a large number of small circular recesses 26 are
arranged on the entire surface.
[0024]
The principle at the time of forming the above-mentioned minute concaves is the press forming
using the punch 16 and the die 17 as described above, but in practice the progressive drawing
process shown in FIG. It can be formed in a series of pressing steps simply by adding the step of
pressing the micro recesses to the final step (f) of e).
03-05-2019
7
[0025]
As described above, according to the buzzer of the present invention, the shock generated at the
time of the drawing process can be obtained by press-forming the minute depressions on
substantially the entire surface of at least one of the upper surface and the lower surface of the
yoke. Since the lines can be removed and the thickness of the flat portion is also uniform, the
smoothness of the yoke is ensured, and the height dimension of the ring placed thereon is also
stable.
As a result, since the gap between the diaphragm and the iron core placed on the ring can always
be kept within the predetermined dimensional value, there is no variation in timbre between
products.
[0026]
Further, according to the invention, by forming a large number of minute recesses in the yoke,
the area of the flat portion is increased, and the magnetic characteristics are improved
accordingly, and the amount of resonance is increased.
[0027]
Furthermore, according to the present invention, by making the thickness of the flat portion of
the yoke uniform, the height dimension of the iron core can be stabilized, and the height
dimension of the coil mounted on the iron core can be kept constant. .
In addition, since the adhesion between the coil and the yoke is also improved, the timbre can be
stabilized by this as well, and this timbre can be controlled.
[0028]
Brief description of the drawings
[0029]
1 is a plan view showing an embodiment of a minute recess formed in the yoke of the buzzer
according to the present invention.
03-05-2019
8
[0030]
2 is a cross-sectional view taken along the line AA in FIG.
[0031]
3 is an explanatory view showing one means in the case of press-molding the minute recess in
the yoke.
[0032]
4 is a schematic view showing the principle of removing the shock line when the micro concave
portion is press-formed.
[0033]
5 is a cross-sectional view of the yoke when the minute recess is press-formed on the upper
surface of the flat portion.
[0034]
6 is a cross-sectional view of the yoke when the minute recesses are formed on both sides of the
flat portion.
[0035]
7 is a plan view of the yoke when the concentric micro concave portion is formed in the flat
portion of the yoke.
[0036]
8 is a plan view of the yoke when the radial micro concaves are formed in the plane portion of
the yoke.
[0037]
9 is a plan view of the yoke when the grid-like minute concave portions are formed in the plane
portion of the yoke.
03-05-2019
9
[0038]
10 is a plan view of the yoke when a large number of small circular recesses are formed in the
plane portion of the yoke.
[0039]
11 is a schematic view showing a progressive pressing process at the time of forming the yoke.
[0040]
12 is a cross-sectional view showing an internal structure at the time of buzzer assembly.
[0041]
13 is a cross-sectional view of the yoke schematically showing a shock line formed on the flat
portion of the yoke.
[0042]
Explanation of sign
[0043]
DESCRIPTION OF SYMBOLS 1 buzzer 3 yoke 4 iron core 5 coil 6 magnet 7 flat surface 7 a lower
surface 7 b flat surface upper surface 8 ring 9 diaphragm 11 gap 12 shock line 15, 23, 24, 25
micro concave groove (micro concave portion) Concave (small concave)
03-05-2019
10
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