close

Вход

Забыли?

вход по аккаунту

JPH11313394

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
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 JPH11313394
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic sounding member that is produced by vibrating a diaphragm with an
electromagnet, and in particular, an electrode terminal structure that can be mounted in a small
size, thin shape and good workability when mounted on a printed circuit board or the like. The
present invention relates to an electromagnetic speaker having the above.
[0002]
2. Description of the Related Art With the recent surface mounting of small electronic
components, the surface mounting type in which an electromagnetic sounding body, which is a
small buzzer, is directly mounted on a printed circuit board has become mainstream, and many
are used for calling pagers such as mobile phones and pagers. It is used.
[0003]
As a conventional electromagnetic sound generator, the technology is disclosed in Japanese
Patent Application Laid-Open No. 8-321670.
FIG. 5 is a perspective view of an electromagnetic speaker according to the prior art. In FIG. 5,
the electromagnetic sounding body 20 is constituted by a cylindrical case 21 in which sounding
members such as a yoke and a diaphragm are built in, and a pair of electrode terminals 22
03-05-2019
1
extending obliquely downward from the upper surface of the case 21 There is. The electrode
terminal 22 is formed of spring steel, stainless steel or the like, and the whole has a spring
property. Further, the tip of the downwardly extending electrode terminal 22 is bent upward in a
U-shape, and the outer surface of the bent portion 23 is elastically pressed against the wiring
pattern formed on the printed circuit board. Further, the bent portion 23 of the electrode
terminal 22 is provided with a protrusion 24 in a portion pressed against the wiring pattern
formed on the printed circuit board.
[0004]
Next, FIG. 6 is a perspective view of an electromagnetic speaker according to another prior art. In
FIG. 6, the electromagnetic sounding body 30 has a cylindrical case 31 in which sounding
members such as a yoke and a diaphragm are built in, and a pair of elongating members
extending in the thickness direction from the upper surface of the case 31. And an electrode
terminal 32 having a spring property. The electrode terminal 32 is curved upward of the case 31
and extends in a substantially U shape. Then, a protrusion 33 is provided in a portion in pressure
contact with the wiring pattern formed on the printed circuit board in the U-shaped portion.
[0005]
However, the above-mentioned two electromagnetic sounding members have the following
common problems. That is, there is a very troublesome operation of soldering one and one
electrode terminal to the substrate of the sound producing body. In addition, because of the one
and one soldering, the positions and heights of the end portions of the electrode terminals are
likely to be uneven. In addition, the cost of parts and processing is high because the substrate
and the spring are separately processed. In addition, since the electrode terminals project from
the outer peripheral portion of the case, the mounting in a small space is not appropriate (FIG. 5).
In addition, it is not suitable for thinning with a structure in which the thickness direction is thick
(FIG. 6). In addition, the soldering operation for soldering the terminal of the coil and the
electrode terminal is required twice. There were various problems such as
[0006]
The present invention has been made in view of the above-described conventional problems, and
its object is to reduce costs by electrode terminal processing, adhesion, coil end processing, etc.,
improve the position accuracy of the electrode terminals, and improve the contactability. To
provide an electromagnetic type sounding body which can be mounted in a small size and thin
03-05-2019
2
structure with a small space.
[0007]
[Means for Solving the Problems] In order to achieve the above object, the electromagnetic
sounding body of the present invention is housed in a case body having a sound emitting hole in
which a lower case and a lower case are fixed, and the case body. A magnetic circuit is formed by
the yoke, an iron core provided at the central portion of the yoke, a magnet arranged around the
base, and the inside of the case body, the magnet, the iron core and the yoke To connect the
external terminal, connect the end of the excitation coil and the excitation coil that is arranged on
the receiving surface of the lower case, facing the magnet and located on the receiving surface of
the lower case. In the electromagnetic sounding body having an external connection terminal for
securing the external connection terminal, the external connection terminal includes a pair of
electrode spring terminals and is fixed to the lower case, and the electrode spring Case And a
terminal of an exciting coil derived from a yoke notch formed on the outer periphery of the yoke
is connected to a coil terminal connection portion of the electrode spring terminal by a fixing
means such as solder. It is characterized by
[0008]
In addition, in order to protect the coil, a silicon coating is applied to a fixing portion such as
solder of the coil terminal connection portion of the electrode spring terminal and the terminal of
the exciting coil.
[0009]
Further, the electrode terminal of the electrode spring terminal is characterized in that a
projection is formed at a position to be in pressure contact with the wiring pattern of the printed
board.
[0010]
Further, the electrode spring terminal is fitted in a positioning dowel formed in the lower case,
and the head of the dowel is heat caulked to attach the electrode spring terminal to the lower
case.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION An electromagnetic speaker according to the
03-05-2019
3
present invention will be described below with reference to the drawings.
1 to 4 relate to an electromagnetic speaker according to an embodiment of the present invention,
and FIG. 1 is a plan view of the electromagnetic speaker.
FIG. 2 is a cross-sectional view taken along line AA of FIG.
FIG. 3 is a right side view of FIG.
FIG. 4 is a side view of the electromagnetic speaker in FIG. 3 attached to a printed circuit board.
[0012]
In FIG. 1 and FIG. 2, 15 is an electromagnetic type sound generator.
The electromagnetic sounding body 15 is composed of a sounding member such as a yoke or a
diaphragm incorporated in the case main body 1 and an electrode terminal 10 extending from
the case main body 1 to the outside. The case body 1 forms the sound release hole 1 a by fixing
the lower case 2 and the upper case 3. The yoke 4 made of a magnetic material is fixed to the
lower case 2 by an epoxy adhesive 5. The sound-producing members housed in the case main
body 1 include an iron core 6 provided at the center of the yoke 4, a magnet 7 disposed around
the yoke 4, and the inside of the case main body 1. The diaphragm 8 is disposed on the receiving
surface of the lower case so as to face the magnet 7 so that a magnetic circuit is formed by the
magnet 7, the iron core 6 and the yoke 4. An exciting coil 9 is disposed around the iron core 6. A
lead frame-shaped electrode terminal 10, which is an external connection terminal for connecting
the terminals 9a and 9b of the exciting coil 9 and connecting them to the outside, comprises a
pair of electrode spring terminals 10a and 10b. The lead frame-shaped electrode terminal 10 is a
lead frame-shaped electrode terminal in a pressed state in an assembled state in place of the
conventional single or single electrode terminal, and a pair of single electrode springs are cut by
cutting described later It becomes terminals 10a and 10b. Protrusions (bumps) 10f and 10g are
simultaneously formed on the electrode terminals of the electrode spring terminals 10a and 10b
at the time of pressing, respectively, at the positions pressed against the wiring pattern of the
printed circuit board.
03-05-2019
4
[0013]
Dowels 2a (four locations) protruding from the upper surface of the lower case 2, an electrode
spring terminal storage recess 2b to be described later and an air escape 2c are formed on the
outer periphery of the upper surface. The positioning holes 10c formed in the lead frame-like
electrode terminals 10 are inserted into the dowels 2a, and the head of the dowels 2a is heat
caulked to fix the lead frame-like electrode terminals 10 to the lower case 2.
[0014]
Next, the ends 9a and 9b of the exciting coil 9 derived from two places of yoke notches 4a (three
places in FIG. 1) formed on the outer periphery of the yoke 4 are coil end connection parts of the
electrode spring terminals 10a and 10b. It is electrically connected to an end 10 d or 10 e by a
fixing means such as solder 11 or the like.
[0015]
After the soldering, a silicon coating 12 is applied to protect the coil as a measure against
disconnection of the soldering portion.
[0016]
Finally, the lead frame-shaped electrode terminals 10 in the assembled state are cut in the
vicinity of the protrusion 10f (parts B and C in FIG. 1) formed at the position pressed against the
wiring pattern of the printed circuit board described later The terminals 10a and 10b are used.
Thereafter, the protrusions 10 f and 10 g formed on the electrode spring terminals 10 a and 10
b are urged so as to protrude from the lower case 2.
[0017]
As shown in FIG. 3, in the free state before attaching the pair of electrode spring terminals 10a
and 10b to the printed circuit board, the height from the upper surface of the lower case 2 to the
protrusions 10f and 10g of the electrode spring terminals 10a and 10b is high. In FIG. 4, the
electrode spring terminals 10a and 10b enter the recess 2b formed in the lower case 2 in FIG.
The height is h2 from the upper surface of the lower case 2 and is extremely low, and the
03-05-2019
5
thickness direction can be minimized as much as possible. At the same time, the electrode spring
terminals 10a and 10b strongly press against the pattern of the printed circuit board 13 to
ensure conduction. It can be taken.
[0018]
The lead frame-like electrode terminals in the assembled state described above are heat caulked
on the lower case, the coil end is soldered to the terminals, and silicon coating is used to take
measures against disconnection etc., thereby providing a mounting space (area, height) Thus, a
low-cost surface-mounted electromagnetic speaker can be obtained with high positional accuracy
of the electrode terminals without requiring much.
[0019]
As apparent from the above description, according to the present invention, the circuit board is
not used, and the cost is reduced because the lead frame-like electrode terminals and the like in a
collective state are not used.
Soldering of two electrode terminals to the substrate and terminal solder of the coil to the
substrate of the electrode terminals can be performed by heat caulking and direct coil soldering
of the coil to the electrode terminals, thereby reducing processing costs.
The positional accuracy of the electrode terminal is improved and the contact reliability is
improved.
It is possible to provide an electromagnetic type sounding body which is excellent in reliability,
which can be mounted in a small space and has a small size and a thin structure, and which is
economically effective.
03-05-2019
6
1/--страниц
Пожаловаться на содержимое документа