Compound speaker for a portable communication device

Details Compound speaker for a portable communication device Compound speaker for a portable communication device

2002-09-18

2004-03-23

Le, Huyen (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Mounting or support feature of housed loudspeaker

C381S338000, C381S345000, C381S182000

Reexamination Certificate

active

06711274

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a compound speaker for a portable communication device such as a portable telephone.
The portable telephone has a speaker for converting a call signal into a sound and a receiver for connecting a sound signal into a sound. If the speaker and the receiver are disposed at different positions in the telephone, it is difficult to compose the telephone in a miniature. In order to miniaturize the portable telephone, the compound speaker is provided.
FIG. 13
is a plan view of a conventional compound speaker,
FIG. 14
is a sectional view taken along a line XIV—XIV of
FIG. 13
,
FIG. 15
is an underside view, and
FIG. 16
is a sectional view taken along a line XVI—XVI of FIG.
15
.
In a case
1
made of synthetic resin, there is provided a yoke
2
made of a magnetic material.
The yoke
2
comprises a flange
2
a
formed on an upper periphery of a cylindrical portion
2
b
having a bottom
2
c
. An annular first magnet
3
is secured to the underside of the flange
2
a
, and a second magnet
8
having disc shape is secured to the bottom
2
c
of the yoke
2
. An annular first top plate
4
made of a magnetic material is secured to the underside of the first magnet
3
, and a second top plate
9
having a disc shape is secured to the upper surface of the second magnet
8
.
A first diaphragm
6
is secured to the underside of the case
1
, and a second diaphragm
11
is secured to the upper surface of the case
1
. A first voice coil
5
and a second voice coil
10
are secured to inside surfaces of the first and second diaphragms
6
and
11
, respectively. The first diaphragm
6
and the first voice coil
5
compose a first sound production device as a speaker, and the second diaphragm
11
and the second voice coil
10
compose a second sound production device as a receiver. Protectors
7
and
12
are secured to the underside and upper surface of the case
1
for protecting the diaphragms
6
and
11
.
There are formed two magnetic gaps. One of the magnetic gaps is a magnetic gap between the periphery of the cylindrical portion
2
b
of the yoke
2
and the inside wall of the top plate
4
. A magnetic field is formed in the magnetic gap based on the magnetic force of the first magnet
3
.
The other is a magnetic gap between the inside wall of the cylindrical portion
2
b
and the periphery of the top plate
9
. A magnetic field is formed in the gap by the magnetic force of the second magnet
8
.
When a signal current is applied to the voice coil
5
or
10
, the diaphragm
6
or
11
is vibrated to generate sounds.
There is formed sound discharge holes
7
a
formed in the protector
7
, sound discharge holes
12
a
in the protector
12
. Furthermore, there are formed vents
1
a
behind the diaphragm
6
and vents
1
b
beside the diaphragm
11
.
FIG. 17
is a sectional side view showing the conventional compound speaker mounted in a case of a portable telephone,
FIG. 18
is a sectional plan view of the portable telephone. A circuit substrate
23
is securely mounted in a case
22
by supporting pillars
22
c
. The circuit substrate
23
has a large recess
23
a
. The compound speaker
21
is disposed in the recess
23
a
and securely mounted in the case
22
by posts
22
b
. The protectors
7
and
12
are held by resilient members
24
and
25
such as rubber. Terminal electrodes
13
of the compound speaker
21
are connected to a circuit on the circuit substrate
23
by flexible print plates
26
. There is provided a liquid crystal display
29
in the case
22
.
FIG. 19
is a sectional side view showing another method for mounting the speaker in the case, and
FIG. 20
is a sectional plan view.
As shown in
FIG. 19
, a lead wire
14
is drawn from each terminal electrode
13
. Further, the lead wire
14
is connected to the circuit substrate
23
.
In the conventional compound speaker, sound discharge holes
7
a
and
12
a
are provided on the upper side and the lower side of the speaker as shown in FIG.
14
. Therefore, the speaker can not be directly mounted on the circuit substrate
23
. Consequently, as shown in
FIGS. 18 and 20
, the large recess
23
a
is formed in the substrate
23
, the substrate must be supported at an intermediate height, and the speaker
21
must be disposed in the recess. Furthermore, sound discharge holes
28
must be formed in both sides of the case
22
. Therefore, a complicated supporting structure is necessary, and the appearance of the portable telephone decreases because of the sound discharge holes.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a compound speaker which may directly be mounted on a circuit substrate.
According to the present invention, there is provided a compound speaker comprising a case having a peripheral side wall, a first sound production device provided in the case, a second sound production device provided in the case, a first sound discharge hole formed in the case for discharging sounds produced by the first sound production device, a second sound discharge hole formed in the case for discharging sounds produced by the second sound production device, at least one of the first and second sound discharge holes being formed in the peripheral side wall so as to discharge sounds in a lateral direction.
The discharge hole provided in the peripheral side wall is provided in a sound discharge pipe projected from the side wall.
The first and second sound discharge holes are formed in protectors provided for protecting the first and second sound production devices.


REFERENCES:
patent: 6212284 (2001-04-01), Puls

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