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DESCRIPTION JPS52125466

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DESCRIPTION JPS52125466
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional alarm
electronic watch, FIG. 2 is a sectional view showing an embodiment of the alarm electronic watch
according to the present invention, and FIG. 3 is an alarm electronic watch according to the
present invention. It is sectional drawing which shows another Example. 7 и и и и и и и и и и и и и и и и и и и и и
electronic buzzer, 9 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и sound emission hole, 11 .......
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alarm
electronic watch, and more particularly, to an alarm electronic watch with improved efficiency of
emitting an alarm sound. A conventional alarm electronic watch, for example, as shown in FIG. 9-5, there is no component sound which emits the alarm sound generated from the forceps buzzer
2 to the outside through the sound emission hole 4f provided in the back pig 5 which constitutes
a part of the outer case 1. In order to round off the alarm sound generated from the electronic
buzzer 2 with a large sound pressure to the outside of the watch, the volume of the space 5 of
the diaphragm 6 of the electronic buzzer 2 and the exterior case 1 and the diameter of the sound
release hole 4 The acoustic resonance frequency known as Helmholtz resonance determined by
the length of the sound emission hole 4 may be mistaken for the IIIIIL number of alarm sounds.
This acoustic resonance frequency / I, ?? = ?? (t + t 6 w), where the volume of the space 50
is ?, the length of the sound emitting hole 40 radius' Itrs the sound emitting hole 4 is t, the
speed of sound is p1 If it is assumed that / ?r ? ииииииииии tIIOa = V / CC ? ? иииииииииииииииииии + = '12' vg
6 ca---------1 m. In the conventional alarm electronic watch, due to the restriction of the exterior
space, the sufficient acoustic frequency and the millimeter wave number are considerably higher
than the frequency of the alarm sound, and an increase in sound pressure can not be expected
based on the acoustic resonance. , Exclusively the resonance of the diaphragm 6 1ll II. The drivewave number of the electronic buzzer 2 is selected as the number, and the alarm noise generated
from the electronic buzzer 2 itself is increased. However, in this case, since the resonance same
wave number of the diaphragm 6 changes due to the variation at the time of manufacture of the
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electronic buzzer 2, the driving of the electronic buzzer 2 lli! There is a fee to adjust the wave
number and get enough sound pressure. Too high acoustic frequency # i Lower the frequency,
use the acoustic resonance to increase the sound emission pressure of the alarm Ka, ma in the
above equation (1), Caf increase the aCa1r to increase the space W65 It is sufficient to make the
volume natural, but the increase of the space 5 requires the watch itself to be large, which is
practically difficult. In addition, it is preferable to reduce the diameter of the sound output hole 4
so as to increase * ", but it is not preferable because the sound output hole 4 is decreased and the
sound pressure of the alarm sound emitted to the outside of the watch also decreases. Therefore,
the present invention increases the inertance ? ? without reducing the sound emission hole
and improves the sound emission efficiency of the alarm sound by utilizing the acoustic
resonance 1I 8111 [several sounds (3) and the sound resonance, and sufficient. The present
invention provides a nine-alarm electronic watch so that an alarm sound of sound pressure can
be obtained, which will be described in detail below 1 m based on the illustrated embodiment.
In FIG. 2 showing one real IM example of the alarm electronic watch according to the present
invention, reference numeral 7 is a watch circuit which is an outer case of one watch and has a
time meter #I inside thereof. An alarm setting circuit, an alarm drive 191 path and the like are
provided, and nine circuit boards (not shown) are accommodated, and the electronic buzzer 8 is
accommodated. The back pig 9 which is a partial tube of the exterior case 7 is provided with a
nineteenth O sound release hole 10 for emitting an alarm sound generated from the electronic
buzzer 8 to the outside of the watch. In the present embodiment, an inner thick portion 11 as a
projecting portion is provided corresponding to the sound emission hole 10, and by this thick
portion 11, the sense of length of the sound emission hole 10 is made longer than that of a part
of the prior art. ing. The electronic buzzer 8 is disposed on the plate 15 so as to surround the
grate 15 having the center pole 14 and made of nine ferromagnetic materials, the excitation coil
15 wound around the center pole 14, and the excitation core (4) + noil 15f. An excavated portion
composed of nine cylindrical permanent magnets 16, a support 17 made of a nonmagnetic
material for accommodating the moving image pickup portion, a rim of the support 17 is
supported, and the magnetism of the excited portion A thin plate 1B made of a ferromagnetic
material to be changed has a total 19 structure with the tItxh plate 19 coupled to Table 1I [] v.
Reference numeral 12 is an air gap formed between the diaphragm 19 and the outer case 7 of
the electronic bushing 8 and reference numeral 20 is the force of the watch-glass. Sugar 3 Figure
is another implementation of the present invention VC prompts alarm electronic watch fF! Since
this is a book showing I, KIHI--codes are attached to members which are practically the same as
the embodiment shown in FIG. In this embodiment shown in FIG. 5, the pipe 21 is provided as a
projecting portion in the sound output hole 10, and nine points are different from the
embodiment shown in FIG. It becomes. Since the alarm electronic watch according to the present
invention is provided with the thick portion 11 or the pipe 21 corresponding to the sound output
hole 7 as the protrusion 7, the length-at of the sound output hole 10 (6) is long Become.
Therefore, assuming that the raw material of the inertano JmaFi sound release hole 10
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represented by the equation (1) described above is sl +, it becomes larger than the case where
the inner thick portion 11 or the pipe 21 is absent. The acoustic resonance W8 wave number
determined by the diameter of the fist portion, the space portion 12 and the diameter of the
sound emission hole 10 and the length of the sound emission hole 10 becomes low. In this way,
by providing a protrusion corresponding to the vc and the sound emission hole 10, it is possible
to lower the frequency by two frequencies, and the external of the clock of the ?-lam sound that
is broken from W wzizer 8 using acoustic resonance. You can give up the sound pressure emitted
by
Moreover, since both the sound and the frequency can be lowered without making the diameter
of the sound emission hole 10 small, the sound of the alarm sound emitted by the outside of the
watch 1 ▒ may be small. There is no The details of the alarm ring 1 gauge according to the
present invention will be described in accordance with the embodiment which is smaller than the
one figure 9 above, but the present invention is not limited to the illustrated embodiment 8 @ I.
Further or improvements can be made. In the case of feeding, a thickened portion 11 and a pipe
21 have a projecting rod configuration [(15), but it may be configured (6) so as to be configured
by IXII. As described above, in the alarm electronic watch according to the present invention, in
the sound release hole provided in the outer case? In response to this, a protrusion is provided,
and the length of the sound emission hole is increased. The inertia noise in the sound emission
hole is increased to lower the acoustic resonance 8 wave number. The sound emission efficiency
of the alarm sound can be achieved by using both Ii, and an alarm sound with a sufficient sound
pressure can be obtained, etc., so that the intended purpose can be sufficiently achieved, and it is
comfortable in practice Play an effect.
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