Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
1999-03-05
2001-07-10
Le, Huyen (Department: 2743)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S398000, C381S414000, C381S421000, C381S431000
Reexamination Certificate
active
06259800
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a speaker for transducing electrical signals into an acoustic sound, and a speaker apparatus employing this speaker.
2. Description of the Related Art
There has hitherto been proposed a speaker apparatus having a magnetic circuit in which a pair of magnets are arranged with the magnetic poles of repulsive polarities facing each other with a center plate in-between to form a repellant magnetic field. Typical of the speaker apparatus of this sort is shown in Japanese Laying-Open Patent H-6-233383. Referring to
FIG. 1
, a speaker apparatus
101
disclosed in this publication includes a vibrating system
105
including a vibrating plate, a magnetic circuit
106
for driving the vibrating system
105
, and a frame
107
for supporting the vibrating system
105
and the magnetic circuit
106
. Referring to
FIG. 1
, this vibrating system
105
includes a substantially frusto-conical main vibrating plate
110
, having a center through-hole, a substantially frusto-conical sub-vibrating plate
111
, mounted on the main vibrating plate
110
with its center axis coincident with the main vibrating plate
110
, a dome-shaped cap
112
, provided for closing the through-hole of the main vibrating plate
110
, a cylindrically-shaped bobbin
113
, connected to the center of the main vibrating plate
110
, a resilient edge
114
connected to the outer edge of the main vibrating plate
110
, and a flexible vibration-absorbing damper
115
provided on the bobbin
113
.
Still referring to
FIG. 1
, the magnetic circuit
106
includes a voice coil
119
fed with the driving current proportionate to the acoustic signals driving the vibrating system
105
, a center plate
120
constituting a magnetic path and a pair of magnets
121
,
122
providing magnetic flux to the center plate
120
. The voice coil
119
is placed around the outer rim of the bobbin
113
of the vibrating system
105
and is provided on the outer rim of the center plate
120
and the magnets
121
,
122
. The voice coil
119
has its both ends connected via braided wires to a connecting portion, not shown, provided on the outer rim of the frame
107
. The center plate
120
is formed as a disc from a magnetic material. The magnets
121
,
122
are formed as discs and are arranged with the centers thereof coincident with the center of the center plate
120
, with the center plate
120
in-between, so that the magnetic poles of repulsive polarities face each other. Referring to
FIG. 1
, a holder
108
for holding the main vibrating plate
110
is provided at an opening end of the frame
107
. To this holder
108
is secured the outer rim of the edge of the main vibrating plate
110
via a ring-shaped gasket,
114
. At a mid portion on the bottom surface of the frame
107
is formed a supporting lug for supporting the magnetic circuit
106
.
If the driving current is fed to the voice coil
119
of the above-described speaker apparatus
101
, the voice coil
119
is vibrated in accordance with Flemings left hand rule. The main vibrating plate
110
and the sub-vibrating plate
111
are vibrated as a result of the vibrations of the voice coil
119
.
There is also known a speaker apparatus as disclosed in Japanese Laying-Open Patent H-6-233384. This speaker apparatus
102
includes a vibrating system
125
, having, a magnetic circuit
126
for driving the vibrating system
125
, a magnetic circuit
126
for driving the vibrating system
125
and a pair of frames
127
,
128
supporting the vibrating system
125
and the magnetic circuit
126
, as shown in FIG.
2
. The vibrating system
125
includes a substantially flat-plate-shaped vibrating plate
130
, having a center through-hole, a cylindrically-shaped bobbin
131
, placed within the through-hole of the vibrating plate
130
, a dome-shaped cap
132
, closing one opening end of the bobbin
131
, a resilient supporting member
133
, mounted in continuation to the outer rim of the vibrating plate
130
, and a pair of resilient vibration-absorbing dampers
134
,
135
, attached to the bobbin
131
, as shown in FIG.
2
.
The magnetic circuit
126
includes a voice coil
139
, fed with the driving current proportionate to acoustic signals used for the driving system
125
, a center plate
140
constituting the magnetic path, and a pair of magnets
141
,
142
for providing the magnetic flux to the center plate
140
. The voice coil
139
is placed around the outer periphery of the bobbin
131
of the vibrating system
125
, and is arranged on the outer periphery of the bobbin
131
of the vibrating system
125
, as shown in FIG.
2
. The voice coil
139
has its both ends connected via a braided wire to a connecting portion, not shown, provided on the outer periphery of the frame
127
. The center plate
140
is formed in a disc shape from a magnetic material, The magnets
141
,
142
are formed in a disc shape and are arranged with the center axes thereof coincident with the center of the center plate
140
, on both sides of the center plate
140
, so that the magnetic poles of repulsive polarities will face each other, with the center plate
140
in-between.
The frames
127
,
128
are assembled with each other to support the vibrating plate
130
and the magnetic circuit
126
therein, as shown in FIG.
2
. The frames
127
,
128
are each formed with a holder
129
for holding the vibrating plate
130
with the outer rim portion of the vibrating plate
130
being supported by the holder
129
via a resilient supporting member
133
. A supporting lug for supporting the magnetic circuit
126
is formed at a mid portion on the bottom surface of the frame
128
.
The above-described speaker apparatus
102
has its voice coil
139
fed with the driving current proportionate to the acoustic signals, whereby the voice coil
139
is vibrated in accordance with Flemings left hand rule. The vibrating plate
130
is vibrated with vibrations of the voice coil
139
to generate the acoustic sound.
There is another type of the speaker apparatus disclosed in Japanese Laying-Open Patent H-6-284499. This speaker apparatus
103
includes a vibrating system
145
, including, a magnetic circuit
146
for driving the vibrating system
145
and a pair of frames
147
,
148
for supporting the vibrating system
145
and the magnetic circuit
146
, as shown in FIG.
3
.
The vibrating system
145
has a set of substantially planar plate-shaped vibrating plates
150
,
151
, each having a center through-hole, and a resilient supporting member
153
mounted on the outer periphery of the vibrating plates
150
,
151
, as shown in FIG.
3
. The vibrating plates
150
,
151
are bonded to each other with a pre-set gap in-between. The resilient supporting member
153
, carrying at its one end the vibrating plates
150
,
151
, has its other end mounted on the frames
147
,
148
.
Referring to
FIG. 3
, the magnetic circuit
146
includes a voice coil
159
, fed with the driving current proportionate to the acoustic signals driving the vibrating system
125
, a center plate
160
constituting the magnetic path, and a pair of magnets
161
,
162
providing the magnetic flux to this center plate
160
. The voice coil
159
is provided providing the inner periphery of the vibrating plates
150
,
151
of the vibrating system
145
, and is arranged on the outer rim portions of the center plate
160
and the magnets
161
,
162
. These magnets
161
,
162
are formed in a ring shape and are arranged with the center axes thereof coincident with the center of the center plate
160
, on both sides of the center plate
160
, so that the magnetic poles of repulsive polarities will face each other, with the center plate
160
in-between.
The frames
147
,
148
, having the same shape, are assembled with each other to support the vibrating system
145
and the magnetic circuit
146
therein. The frames
147
,
148
are each formed with a holder
149
for holding the vibrating plates
150
,
151
. To this holder
149
are secured outer rims of
Le Huyen
Maioli Jay H.
Sony Corporation
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