Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
1999-03-19
2001-07-31
Kuntz, Curtis (Department: 2643)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S420000, C381S401000
Reexamination Certificate
active
06269168
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a speaker apparatus for transducing electrical signals into acoustic sound in which the apparatus can be reduced in thickness.
2. Description of the Related Art
There has hitherto been used a speaker apparatus in which the sound in the high frequency range and the sound in the mid to low frequency range are reproduced with respective different vibrating plates. As this speaker apparatus, there is proposed a coaxial two-way speaker apparatus in which a vibrating plate reproducing the sound of a high frequency range and another vibrating plate reproducing the sound of the mid to low frequency range are arranged superimposed with the centers in the vibrating direction coincident with each other.
As this type of speaker apparatus, one arranged as shown in
FIG. 1
is proposed. A speaker apparatus
101
, shown in
FIG. 1
, includes a vibrating system for the high sound range
105
for generating the acoustic sound of a high sound range, a magnetic circuit for high sound range
106
for driving the vibrating system for the high sound range
105
, a vibrating system for the mid to low sound range
107
for generating the acoustic sound of a mid to low sound range, and a magnetic circuit for mid to low sound range
108
for driving the vibrating system for the vibrating system for the mid to low sound range
107
.
The vibrating system for the high sound range
105
is supported by a frame
109
and includes a dome-shaped vibrating plate
110
, a cylindrically-shaped bobbin
111
, carrying one end of the vibrating plate
110
, and a resilient edge
112
connected to the outer rim of the vibrating plate
110
.
The magnetic circuit for high sound range
106
includes a voice coil
114
, for vibrating the vibrating system for the high sound range
105
, a yoke
115
for forming a magnetic path, a magnet
106
for according the magnetic flux to the yoke
115
, and a top plate
117
provided adjacent to the magnet
116
for defining a magnetic gap. The voice coil
114
is provided on the outer periphery of the bobbin
111
of the vibrating system for the high sound range
105
within the magnetic gap. Both ends of the voice coil
114
are connected via a braided wire, not shown, to a connection terminal
110
provided on the outer rim of the frame
109
. The yoke
115
is formed of a magnetic material in a disc shape and has an upstanding columnar center pole
118
. This center pole
118
is inserted into the inside of the bobbin
111
of the vibrating system for the high sound range
105
. The magnet
116
, mounted on the yoke
115
, has a ring shape into which is inserted the center pole
118
. This magnet
116
has the yoke side and the top plate side magnetized to an S-pole and to an N-pole, respectively. The yoke
115
has its position adjacent to the S-pole side of the magnet
116
magnetized to an S-pole. The magnet
116
, mounted on the yoke
115
, has a ring shape, with a center opening into which is inserted the center pole
118
. The top plate
117
, magnetized to an N-pole, has a magnetic gap defined between its inner rim and the outer rim of the center pole
118
.
The magnetic circuit
106
is covered by a shield cover
119
for prohibiting the magnetic flux from leaking from the magnetic circuit
106
to outside, as shown in FIG.
1
.
Referring to
FIG. 1
, the vibrating system for the mid to low sound range
107
includes a substantially conically-shaped vibrating plate
120
, having a center through-hole, a cylindrically-shaped bobbin
121
, having its one end mounted in a through-hole in the vibrating plate
120
, a resilient edge
122
, connected to the outer rim of the vibrating plate
120
, and a resilient vibration-absorbing damper
123
mounted on the bobbin
121
.
Referring to
FIG. 1
, the magnetic circuit for mid to low sound range
108
includes a voice coil
124
for vibrating the vibrating system for the mid to low sound range
107
, a yoke
125
forming a magnetic path, a driving magnet
126
for according the magnetic flux to this yoke
125
, a top plate
127
provided adjacent to the driving magnet
126
for defining the magnetic gap and a cancelling magnet
128
for prohibiting the magnetic flux of the driving magnet
126
from leaking to outside of the magnetic circuit for mid to low sound range
108
.
The voice coil
124
is provided on the outer rim of the bobbin
121
of the vibrating system for the mid to low sound range
107
within the magnetic gap. Both ends of the voice coil
124
are connected to the connection terminal
110
provided on the outer rim of the frame
109
via a braided wire
130
. The yoke
125
is formed of a magnetic material in a disc shape and has an upstanding columnar center pole
131
. This center pole
131
is inserted into the inside of the bobbin
121
of the vibrating system for the mid to low sound range
107
. The driving magnet
126
, provided on the yoke
125
, has a ring shape with a center opening into which is inserted the center pole
131
. This driving magnet
126
has the yoke side and the top plate side magnetized to an S-pole and to an N-pole, respectively. The yoke
125
has its position adjacent to the S-pole side of the driving magnet
126
magnetized to an S-pole. The top plate
127
, mounted on the driving magnet
126
, has a ring shape into which is inserted the center pole
131
. The top plate
127
, magnetized to an N-pole, has a magnetic gap defined between its inner rim and the outer rim of the center pole
118
. The cancelling magnet
128
has a ring shape and is provided on the rear end of the yoke
125
. The cancelling magnet
128
has the yoke side and the rear end magnetized to the S-pole and to the N-pole, respectively.
This speaker apparatus
101
has a frame
109
supporting the vibrating system for the mid to low sound range
107
, as shown in FIG.
1
. This frame
109
is formed of a metallic material and substantially conically shaped and flared from the rear end towards the front end. The frame
109
has, on its front end side, a holder
132
for holding the vibrating system for the mid to low sound range
107
. To this holder
132
is secured the outer rim of the edge
122
of the vibrating system for the mid to low sound range
107
via a gasket, not shown.
In the above-described speaker apparatus
101
, if the current is fed to the voice coils
114
,
124
, the voice coils
114
,
124
are set into vibrations and, in keeping with the vibrations of the voice coils
114
,
124
, the vibrating plates
110
,
120
of the vibrating system for the high sound range
105
and the vibrating system for the mid to low sound range
107
are set into vibrations to produce the acoustic sound.
Referring to
FIG. 2
, a modified speaker apparatus
102
, having a vibrating system for the high sound range
135
and a magnetic circuit for high sound range
136
different from those of the above-described speaker apparatus
101
, is explained. Since the vibrating system for the mid to low sound range and the magnetic circuit for mid to low sound range of the speaker apparatus
102
are similar to the vibrating system for the mid to low sound range
107
and to the magnetic circuit for mid to low sound range
108
of the above-described speaker apparatus
101
, shown in
FIG. 2
, corresponding parts are depicted by the same reference numerals and are not explained specifically.
Referring to
FIG. 2
, the vibrating system for the high sound range
135
is supported by the magnetic circuit for mid to low sound range
108
, and includes a dome-shaped vibrating plate
140
, a cylindrically-shaped bobbin
141
, carrying one end of the vibrating plate
140
, and a resilient edge
142
connected to the outer rim of the vibrating plate
140
.
The magnetic circuit for high sound range
136
includes a voice coil
144
, for vibrating the vibrating system for the high sound range
135
, a bottomed tubular yoke
145
for forming a magnetic path, a magnet
146
for according the magnetic flux to the yoke
145
, and a top plate
147
provided
Dabney P
Kuntz Curtis
Maioli Jay H.
Sony Corporation
LandOfFree
Speaker apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Speaker apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speaker apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2561628