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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view, FIG. 2 is a bottom view, FIG. 3
is a sectional view of a magnet, and FIG. 4 is a bottom view of the same. is there. 1 ...... York, 3 ......
coils, 3a- lead, 6 ...... magnets, 6a ...... protrusions, 6b ...... recess , 7 ... ... notched part.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound
producing device used for a watch or the like. Conventionally, a buzzer as a sound producing
device is provided with a screw hole at the center of the yoke, and one end of an iron core is
screwed to this and planted, and the other end is used as a suction surface of a diaphragm. A coil
is wound around the iron core, and a donut shaped sintered magnet is fitted on the outside of the
coil. The upper end surface of the magnet is provided with a step between the peripheral edge
portion and the central portion, and the diaphragm is attached to the peripheral edge portion by
suction and is opposed to the suction surface of the iron core with a predetermined gap. Further,
since the central portion of the lower end face of the magnet is cut away to pass the lead wire of
the coil, the magnet is fixedly supported by the yoke at the peripheral portion of the lower end
face projecting downward. The yoke is provided with a notch at a length reaching the notch on
the lower surface of the magnet from the periphery, and the lead wire of the coil is drawn out
from the notch. In this case, the yoke is formed by punching an iron plate with a press, but it is
impossible from the viewpoint of pressing technology to open a gap smaller than the plate
thickness. On the other hand, since the yoke needs a certain thickness to reduce the magnetic
resistance, the notch is relatively large in proportion to the thickness of the yoke. Therefore, after
pulling out the lead wire, a seal agent such as lacquer is applied to the notch. However, if the seal
agent with a high viscosity is used because the notch is large, (2) ++ seal agent gets inside and
magnet In some cases, the seal may not float, or the seal may not be perfect, which causes the
gap between the diaphragm and the suction surface to deviate from a predetermined value, and
also the degree of sealing of the horn to deteriorate the sound pressure. There's a problem. Thus,
the sealing agent preferably has a low viscosity to prevent the magnet from floating, while a
sealing agent having a relatively high viscosity that seals relatively large notches is preferable.
Also, considering the processability, one having a short curing time is preferable, but one that
solidifies immediately is also inconvenient, so there was no suitable sealing agent that satisfied
all such conditions. Also, the magnet is only fixed to the yoke at the peripheral edge of the lower
end face, and since the play stop is not disposed, the magnet is detached by an impact. On the
other hand, also in the configuration in which the case wall is provided on the case wall above
the upper end of the magnet, there is a disadvantage that the vibration plate is damaged by an
impact because the space between the space plate and the magnet opposes via the diaphragm.
The present invention is intended to eliminate the above-mentioned drawbacks, and the yoke is
provided with a large notch, and a protrusion is provided on the lower end face of the magnet so
as to be fitted with a small gap to the large part of the cut (3). There is no need to consider the
viscosity and curing time of the sealing agent by forming the small four parts for lead wire
extraction of the coil and the play of the magnet, and there is no concern that the magnet may
come off or the diaphragm may be damaged by impact. It is an object not to provide a sound
producing device.
In FIGS. 1 to 4, which will be described below with reference to the drawings, the yoke 1 has a
disk shape and a substantially semicircular cutout 7 is formed along the outer peripheral portion,
The iron core 2 is planted, the coil 6 is fitted to this, and fixed by the bobbin seat 4. Furthermore,
a magnet 6 which is concentrically disposed with a doughnut-shaped magnet 6 on the yoke 1
and outside the coil 6 via a gap 5 is a plastic magnet, and is formed in an annular shape
surrounding the coil 3 by injection molding. On the lower end face of the same, there is formed a
projecting portion 6a which is fitted at a small distance 619 to the notch 7 of the yoke 1 as
shown in FIGS. This protrusion is approximately equal to the plate thickness of the yoke 1 and is
provided at the top of the semicircular cross section, that is, on the inner side surface portion of
the magnet 6, with a small recess 6b for drawing out the lead wire 3a of the coil 3 to the outside.
A protrusion 6C is formed in the direction of the outer surface of the protrusion 6α along the
surface of the case 8 into which the yoke of the case 8 is pressed. The upper end surface of the
magnet 6 has a step with the outer peripheral portion as the upper stage and the inner
peripheral portion as the lower stage. The diaphragm 10 is attracted and held by the outer
peripheral portion of the magnet upper end face, and a predetermined gap 11 is interposed
between the diaphragm 10 and the suction surface 2α of the iron core 2. 12 is fixed on the
diaphragm 10 by mass. The above components are accommodated in the lower part of the case
8, and the outer peripheral part of the yoke 1 and the outer part of the projecting part 6α of the
magnet are pressed into the case. In order to improve the acoustic effect, a sealing agent is
applied to the space between @ 9 and 4 parts 6 h to seal the opening. An upper portion of the
case 8 is a vacant space 13, which functions as a horn, and a sound producing portion 14 is
opened on the upper surface of the vacant space. (5) Because of the above configuration, iron
core 2. Vibrating plate 10 ° magnet 6. If a magnetic circuit of '= 1−1 is constructed and a
blocking oscillation circuit is connected to the lead wire 6α of the coil 3, for example, the
magnetic flux induced by this pulsating current passes through the magnetic circuit. -It is
attracted | sucked by the adsorption | suction surface 2a of the iron core 2, it vibrates in
response to a deflection | pulsation pulsating current, and a buzzer sound is emitted from the
sound production part 14. FIG. The shape of the projection 6α of the magnet 6 and the
corresponding cutout 7 of the yoke 1 is not limited to the upper peeling, and may be rectangular
in cross section or trapezoidal in cross section. As described above, according to the present
invention, the magnet is provided with the projecting portion having the four parts for drawing
the lead wire, and the notch corresponding to the projecting portion is provided on the yoke
outer peripheral portion and fitted thereto. Fit and seal. Since the recess for drawing out the lead
wire can be formed small and the notch of the yoke is used for fitting to the protrusion of the
magnet, the gap with the protrusion is not affected by the thickness of the yoke, Since it can be
formed arbitrarily narrow, it is not necessary to consider (6) the viscosity and curing time of the
sealing agent, and a sealing agent with good workability can be selected.
Further, since the four parts are small, the sealing agent does not enter inside, and the gap
between the diaphragm and the suction surface does not change, so that the sound pressure is
not reduced. Further, since the projection in the direction of the outer surface acts to stop the
play of the magnet, the magnet does not come off due to an impact, and the diaphragm is not
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