JPS5680598

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DESCRIPTION JPS5680598
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a conventional
mounting structure of a piezoelectric buzzer, FIG. 2 is a sectional view showing one embodiment
of a mounting structure of a piezoelectric buzzer according to the present invention, and FIG. b is
a perspective view and a sectional view showing a holding member and a piezoelectric buzzer,
respectively. DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... circuit board, 3 ... lid, 4 ... resonance box,
5 ... piezoelectric buzzer, 6, 7 ... sound emission hole, 11 ... case, 13 ... Lid, 14 ... Circuit board, 15
... Holding member, 15a, 15b ... Opening end, 16 ... Piezoelectric buzzer, 17 ... Piezoelectric
element, 18 ... Diaphragm, 20 ... sound absorption
Detailed Description of the Invention The present invention relates to the improvement of the
structure for attaching a piezoelectric buzzer in a small size 'fa device. Recently, a computer
equipped with a piezoelectric buzzer in a small electronic device such as an electronic ttmm
electronic watch or an electronic watch. There are products used for sounding such as key
operation a of soundproofing and alarm sound of storm clock. 2、。 −と? >-To provide a
piezoelectric buzzer on a small insulator device. In order to increase the sound pressure of the
sound emission, a piezoelectric buzzer is housed and fixed in a resonance box, and a mounting
structure of a title buzzer is adopted in which the resonance box is arranged and fixed inside a
case of an apparatus. An example of this mounting structure is shown in FIG. 1. In the figure, 1 is
a case of the device, 2 is a circuit board provided in the case 1, 3 is a lid to cover the case 1, 4 is
a circuit board 2 And the like. A resonance box fixed by means of the invention, 5 is a
piezoelectric buzzer housed and fixed in the resonance box 4, and a sound emission hole 6 is
formed on the outside of the resonance box 4 at the outside of the au-tear buzzer 5. A sound
output hole 7 is formed in 3 corresponding to the sound output hole 6. Then, when an electron is
applied to the buzzer 5 and vibrated to generate sound, this sound is emitted from the sound
emission hole 6 of the resonance box 4 through the sound emission hole 7 of = S to the outside,
In the mounting structure of such a pressure buzzer 5, the resonance box 4 has a single box
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formed by collecting the lf 収 buzzer 5, and in the case 1, it is separated from ★ 3 in another 1 It
is provided in (2). For this reason, there is a space between the lid 3 and the resonance cavity 4,
and the space communicates with the outside of the case 1 through the sound emission hole 7 of
the good 3 (also communicates with the internal space of the nicase 1) . Therefore, dust and
moisture outside the case 1 vent the air gap between the lid 3 and the resonance box 4 from the
sound release hole 7 and enter the case 1 internal space, and further the circuit portion of the
circuit board 2 Etc. to create a cause of @ pneumatic failure such as short circuit or malfunction
二 two wax The present invention was made in view of the above-mentioned circumstances, and
by means of the pressure buzzer attachment, the case internal space between the lid and the lid A
seal is provided between the sound output hole to prevent the occurrence of a temporary failure
and to provide a pressure buzzer attachment structure which does not impair the sound emission
of the earth's buzzer. The present invention will be described below with reference to the
drawings. FIGS. 2 and 3 show an embodiment of the present invention, in which 11 is a case of a
small rafter, for example, a small magneton computer, and this case 1) is made of synthetic resin
and decorated on the outer surface For the metal 4 temporary 12 is polymerization fixed. A lid
13 made of a synthetic resin is put on the open part of the case 1, for example, the lower part in
the figure, and the lid 13 is attached to the case 11, for example, in an elastic old manner.
The circuit board 14 is disposed in a layered structure inside the case no, and a circuit pad (not
shown) is printed on the lower surface of the circuit base 14 and the appropriate ladder element
(not shown) is formed. Not shown) or mounting. In the figure, 15 is a holding member for
holding the pressure-operated buzzer 168-this holding member 15 is made of an elastic material
which shoulders the P3 edge, for example, made of rubber, opening both ends and opening end
portions 15a, 15b For example, a cylindrical shape. The holding member 15 has an inner
diameter capable of holding the buzzer 16 and has a pair (preferably, a clearance) between the
circuit board * 14 and the: # J3 (height of the internal space A of the case 11). Large)-M is. If the
holding member 15 is placed in the case 11 (c), the holding member 15 placed in the case 11 (c)
can be pressed and held by the lid 13 and the pressure buzzer 16 can be arranged separately
from the circuit board 14 and the lid 13 It is. The holding member 15 is disposed inside the case
11 (on the lower surface of the circuit board 14 in the second case, one open end J5a is located
on the outer side of the case 11 (lid 13 side) and the other open end 1sb is a circuit board It is
fixed to the lower surface of the crest 14 by means such as screwing or screwing with an
adhesive. In the figure, 16 is a pressure buzzer which is held inside the holding portion 15-this
one king electric buzzer 16 is a central part of a vibrating element 18 having a disc element 118a disc-like shape . If chamber buzzer 16 is disposed on the cross section at the inner intermediate
position of holding member 15, the peripheral edge portion of diaphragm 18 is fixedly engaged
to one strip m 15c formed in the same direction as the inner circumference of holding member
15 It is done. For this reason, the piezoelectric buzzer 16 is securely held in the holding portion
fifteenth interior (two-position-fixed state. In this case, the pressure element 17 is inside (circuit
base 8! The diaphragms 18 are respectively located on the outer side (the lid 13 side) on the Lld
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side). The title element 17 of the pressure buzzer 16 and the diaphragm 18 are connected to the
circuit pattern on the lower surface of the circuit board 14 by the 1'-1 wire 19). Further, the lid
13 is formed at a portion substantially facing the opening end isa facing the outer side of the
holding member 15 at the approximate center of the opening end 15a so that the number of
sound emission holes 20 of the number of plates is formed. The hole 20 is opened through the
41 of the lid 13. When the lid 113 is attached to the open portion of the case 1. Contact the open
end 15a of the holding member 15 facing the outside and press it. For this reason, the holding
member 15 is folded by one on the circuit board 14 on one side, the lid 13C is pressed and held
on the other, and is secured (two fixed) by both.
In this case, the sound release hole 20 of the lid 13 faces the opening end 15a of the holding
portion I; t15. As a method of holding the FE buzzer 16 inside the holding member 15, when
forming the holding member 15 made of rubber, the pressure buzzer 16 is disposed in the moldlike firefly type, and There are those that are integrated or those that use the elasticity of rubber
to push and spread the open end of the stopper portion 15 and push the earthen buzzer 16
inside to fix integrally. Thus, in the mounting structure of the king ring buzzer 16, when '4' is
applied to the piezoelectric element 17 of the piezoelectric buzzer 16 by the lead wire 19, 1) the
moving plate 18 is moved by the movement of the piezoelectric element 17). With this
movement, electricity vibrates and sounds are generated. This sound is discharged to the outside
of the case 1 through the Tli sound hole 20 of the lid 13 and piled. In this case, the medical
holding part 15 has a tubular shape and an internal space exists, and the king 4 buzzer 16 is held
in this internal space, so the t1 holding member plays the same role as a conventionally used
resonance box The opening end 15m of 15 corresponds to the sound emission hole formed in
the resonance box. For this reason, the sound produced by the positive electric buzzer 16 is
emitted with a large sound pressure by the role of the resonance sound of the holding and
holding material 15. In such a mounting structure of the piezoelectric buzzer 16, the open end
15b of the cylindrical holding member 15 is in contact with the circuit board 14 to be fixed. The
open end 15m of the holding part 15 is in contact with and held by the lid 13 in the case internal
space A by being linearized with respect to the case internal space A where two cases 11 and -djt
13 exist. It is closed against. (In addition, the inside of the holding member 15 is divided by the
piezoelectric buzzer 16) in the middle. )また。 The holding portion fifteenth opening end 15a of
the lid 13 in which the sound release hole 20 is formed is opposed to "the part is covered by the
lid 13 and the opening end 15a afterward", the inside of the case of the lid 13 The sky 17 〒 A
and the other parts are divided. Therefore, the inside of the holding member 15 communicating
with the sound release hole 20 of the magnet 13 is not in communication with the case internal
space A in a partitioned manner. Therefore, even if external dust and water flow through the
sound release hole 20 and enter into the holding member 15, they do not move to the case
internal space A, and the circuit pattern on the lower surface of the circuit board 14 bleeds into
the case internal middle A Since it does not base on ladder parts, it is possible to prevent a
teacher with a temporary operation failure such as a short circuit or an incorrect work. (Note that
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moisture that has entered the holding member 15 is not added to the circuit pattern of the lower
portion of the circuit board 14 that is continuously mounted on the output buzzer 16 and the
internal part 15 of the retaining part 15 is broken.
In other words, when the lid 13 comes in contact with the holding member 15, the holding
member 15 is used both as a retention and as a seal. In addition, since the holding member 15 is
formed of an elastic material such as rubber, it is possible to use the product and the cover 13 to
ensure that the work is carried out. (Especially when the height of the holding member 15 is
larger than the height between the grass inside the case A), and even if the height of the case
internal space A changes due to mounting conditions 1) The f movement can be absorbed by
elastic deformation . Note that the holding member is in the form of a cylinder holding a
piezoelectric buzzer inside, l = f: the end that is exposed to the vibrating plate of the suzzer is
open, and the open end is outside and inside the case It is based on the fixed arrangement. For
example, the holding member may be formed not by 14 materials but by a synthetic resin. The
inner end of the pressure device facing the piezoelectric element of the pressure buzzer may be
blocked or scooped. The outer end may not open entirely but may form an 11-point or swinghole of urine. Alternatively, it may be attached to a portion k of the pond which can be directly
accommodated in the case without being attached to the circuit board, or one example may be
attached to the case itself. This attachment-construction is also not limited. また。 The present
invention can be widely applied to small electronic devices equipped with a piezoelectric buzzer.
The mounting structure of the crusher buzzer according to the present invention seals the space
between the sound release hole of the ★ and the inside of the case by the holding member for
holding the pE dragon buzzer as described below: Etc. to prevent them from invading into the
inside of the case and writing them out on a circuit board, so that the occurrence of waxy ster It
can be done well.
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