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JPS62116000

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DESCRIPTION JPS62116000
[0001]
FIELD OF THE INVENTION The present invention relates to an alarm clock with an electronic
buzzer. [Prior Art] In a conventional piezoelectric buzzer, a diaphragm 14 to which a piezoelectric
rope 13 is attached is fixed in parallel to a frame 16 in which a sound emission port 15 is formed
as shown in FIG. [Problems to be Solved by the Invention] For example, when trying to configure
a piezoelectric buzzer on a small watch such as a watch, the diaphragm is limited in parallel to
the frame as shown in FIG. If fixed, placement will be difficult. If the diameter of the diaphragm is
reduced so as to be able to be disposed inside the frame, the resonance frequency becomes high,
and a sufficient sound pressure can not be obtained. In addition, if the position of the sound
emission port is also provided on the bottom of the frame, in the case of a watch, the arm may be
clogged and sound may not be heard. In addition, if it is provided at the rising portion of the
frame, the resonance space must be increased, which is disadvantageous in space. In the present
invention, the space factor is good and the sound pressure is sufficient. [Means for Solving the
Problems] In the present invention, a vibration head is fixed obliquely inside the frame from the
bottom surface of the frame to the rising portion of the frame, and noise is emitted from the
bottom to the rising portion. It is designed to form a mouth. [Embodiment] In FIG. 1, 1 is a frame,
in which a watch movement (not shown). Arrange the collet 2). A printed circuit board 3 is fixed
to the collet 2 and a wheel train (not shown) is provided in the internal space 4. Etc.) is placed. 5
is a glass edge fixed to the frame 1 and 6 is a cover. 7 is a dial. The fixing projection 9 of the
diaphragm 8 is formed inside the bottom surface 1 a of the frame 1, and the fixing portion 1 c of
the diaphragm 8 is also formed inside the rising portion 1 b of the frame 1. The piezoelectric
element 12 is attached to the diaphragm 8, and is fixed obliquely to the bottom surface 1a by the
projection 9 and the fixing portion 1c. Therefore, the space factor is good, and electronic parts
such as the crystal oscillator 10 and the IC circuit 11 fixed on the printed circuit board 3 can be
avoided. Moreover, the diameter of the diaphragm 8 can be made relatively large, and a sufficient
04-05-2019
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sound pressure can be obtained. Further, a sound emission port 1d is formed as shown in FIG. 2
along the bottom surface 1a and the rising portion 1b. Therefore, even if the watch device is
attached to the arm, the sound is not blocked by the arm, and the sound can be emitted
efficiently. Moreover, the volume of the resonance space formed by the diaphragm 8 and the
frame 1 can be increased, and the resonance frequency can be lowered, so that sufficient sound
pressure can be obtained.
Although the watch has been described in the above embodiment, the present invention is not
limited to this and can be applied to a small clock as well. According to the present invention,
since the diaphragm is obliquely fixed to the bottom and the rising portion of the frame, the
space factor is good, and other parts can be efficiently stored. Moreover, since a relatively large
diaphragm can be used, sufficient sound pressure can be obtained. Further, by forming a sound
emission port from the bottom to the rising portion, sound can be emitted efficiently, and in
particular, in the case of a watch, even if it is worn on the arm, it is not blocked by the arm.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a
bottom view of FIG. 1, and FIG. 3 is a cross-sectional view showing one example of a conventional
piezoelectric buzzer.
DESCRIPTION OF SYMBOLS 1 ... Frame 1a ... Bottom face 1b ... Rising part 1d ... Sound emission
port 8 ... Diaphragm 12 ... Piezoelectric element or more Fig. 1
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