Communications: electrical – Audible indication – Diaphragm
Reexamination Certificate
1999-11-17
2001-03-27
Tong, Nina (Department: 2632)
Communications: electrical
Audible indication
Diaphragm
C340S407100, C340S384100, C340S311200, C340S870030, C381S396000, C310S071000, C455S349000
Reexamination Certificate
active
06208238
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic sound generating body incorporated in mobile communications devices, such as cellular phones and pagers, that generates an incoming call indicator tone when the device receives an incoming call.
2. Description of the Related Art
A known example of the conventional electromagnetic sound generating body of this kind is a buzzer
1
which is thin and has a vibratory sound generating unit (not shown) incorporated in a rectangular parallelepiped resin casing
2
shown in
FIGS. 1 and 2
. The buzzer
1
is surface-mounted on a printed circuit board
4
and incorporated in a exterior case
3
of, for example, a cellular phone. The casing
2
has a sound release hole
5
formed in the front side thereof, which is arranged coaxial with an external sound release hole
6
formed in the exterior case
3
. To prevent the incoming call indicator tone released from the sound release hole
5
of the buzzer
1
from becoming trapped inside the exterior case
3
, a sound leakage prevention packing
7
is provided in a gap between the sound release hole
5
and the external sound release hole
6
of the exterior case
3
.
In the conventional buzzer
1
, however, because external connection terminals
8
are formed at four corners of the casing
2
and directly soldered to the wiring pattern on the printed circuit board
4
, vibrations of the buzzer
1
propagate to other electronic components and circuits mounted on the printed circuit board
4
, producing noise in these electronic circuits and components.
Further, because the buzzer
1
is surface-mounted on the printed circuit board
4
, if the printed circuit board
4
is deviated from the correct mounting position when assembled into the exterior case
3
of a cellular phone, the sound release hole
5
of the casing
2
fails to align coaxially with the external sound release hole
6
of the exterior case
3
, resulting in the incoming call indicator tone being trapped inside the exterior case
3
.
SUMMARY OF THE INVENTION
A primary object of the present invention is to provide an electromagnetic sound generating body which prevents vibrations of the electromagnetic sound generating body from producing noise in electronic components and circuits mounted on a printed circuit board.
A second object of the present invention is to provide an electromagnetic sound generating body which, when the electromagnetic sound generating body is assembled, allows the sound release hole of the casing and the external sound release hole of the exterior case to be aligned in position easily and reliably, thereby preventing an incoming call indicator tone from being trapped inside the exterior case.
To achieve the above objectives, an electromagnetic sound generating body according to the invention comprises: a sound generator; a thin casing having an upper case and a lower case combined together, the casing incorporating the sound generator; a sound release hole formed in the casing; connector terminals insert-molded in said lower case when said lower case is molded; wherein the connector terminals are projecting from the casing and have cylindrical insertion portions formed at their front ends for connection with external terminals, and the cylindrical insertion portions are each formed with a slit along an axis of the cylinder; and base portions of the connector terminals for connection with a coil, which comprises the sound generator, are exposed to an interior of the lower case during the insert molding of the connector terminals.
With this construction, because the electromagnetic sound generating body can be electrically connected to the printed circuit board simply by inserting the connector terminals projecting from the casing into the external terminals, there is no need to surface-mount the electromagnetic sound generating body onto the printed circuit board. Therefore, vibrations of the electromagnetic sound generating body can be prevented from propagating to the printed circuit board and producing noise in the electronic components and circuits mounted on the printed circuit board.
Further, because the connector terminals have the cylindrical insertion portions at their front ends which are each formed with a slit, the insertion portions when inserted into the external terminals are deformed elastically so that they do not come off easily, thus assuring reliable electrical connection.
Further, because the connector terminals are insert-molded into the lower case and the base portions of the connector terminals are exposed to the inside of the lower case, the connector terminals can easily be attached to the casing and the connection between the base portions of the connector terminals and the coil forming the sound generator can be made easily.
Further, with this invention, because the electromagnetic sound generating body is directly attached to the exterior case, the alignment between the external sound release hole of the exterior case and the sound release hole of the electromagnetic sound generating body can be done easily, thus preventing the output sound generated by the electromagnetic sound generating body from being trapped inside the exterior case.
These features and advantages will be described in more detail by referring to the accompanying drawings.
REFERENCES:
patent: 5107155 (1992-04-01), Yamaguchi
patent: 5353017 (1994-10-01), Suzuki et al.
patent: 5619181 (1997-04-01), Murray
patent: 5668423 (1997-09-01), You et al.
patent: 5861686 (1999-01-01), Lee
patent: 5894263 (1999-04-01), Shimakawa et al.
patent: 5971775 (1999-10-01), Tor et al.
patent: 5986367 (1999-11-01), Tsuzaki et al.
Browdy and Neimark
Citizen Electronics Co. Ltd.
Tong Nina
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