Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2002-09-20
2004-08-24
Le, Huyen (Department: 2643)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S386000, C381S423000, C181S171000
Reexamination Certificate
active
06782114
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a loudspeaker used as audio equipment, in particular to a loudspeaker having an edge at an outer periphery of a diaphragm, wherein an outer end of the edge is attached on an attaching surface which is formed at the inside of an outer peripheral rim of a speaker frame.
The present application claims priority from Japanese Application No. 2001-304862, the disclosure of which is incorporated herein by reference for all purposes.
2. Description of the Related Art
A conventional loudspeaker for reproducing music or the like has a basic structure as shown in FIG.
4
.
FIG. 4
a
is a top plan view, and
FIG. 4
b
is a sectional view taken along a line x—x of
FIG. 4
a
. In
FIGS. 4
a
and
4
b
, a magnetic circuit
1
comprises a magnet
2
, a lower plate
3
, and an upper plate
4
. In the magnetic circuit
1
, a gap between magnetic poles is formed between the upper plate
4
and a center pole
5
which stands straight from a center position of the lower plate
3
. A coil bobbin
6
which sets a voice coil
7
by winding is located so as to arrange the voice coil
7
within the gap between the magnetic poles. A center cap
8
is mounted upon an upper end of the coil bobbin
6
. At the vicinity of the upper end of the coil bobbin
6
, a center portion of a diaphragm
9
is fixed. An annular edge
12
is connected with an outer periphery of the diaphragm
9
. The diaphragm
9
is attached on an upper portion of a speaker frame
10
, which is provided on the upper plate
4
, through the edge
12
.
On the upper portion of the speaker frame
10
is formed an outer peripheral rim
10
a
, which has an attaching surface
10
b
inside it. At the outer end of the edge
12
is formed an outer end portion
12
a
, which is mounted on the attaching surface
10
b
as a part of the speaker frame
10
. The outer end portion
12
a
is pressed down onto the attaching surface
10
b
by a gasket
13
, which is also attached onto the attaching surface
10
b
, so as to be airtightly attached onto the attaching surface
10
b.
In addition, one end of a damper
11
is connected with the coil bobbin
6
, and the other end thereof is supported by a damper supporting section
11
a
, which is connected with the speaker frame
10
, so that the voice coil
7
can be accurately held within the gap between the magnetic poles of the magnetic circuit
1
.
In such a configured loudspeaker, the coil bobbin
6
is oscillated according to driving signals supplied to the voice coil
7
. The diaphragm
9
, which is supported by the damper
11
and the edge
12
having a function of suspension, is oscillated by the oscillation of the coil bobbin
6
, thereby reproducing sound based on sound signals supplied to the voice coil
7
.
In the conventional loudspeaker as mentioned above, an attaching screw section
14
for attaching the speaker frame
10
onto a baffle plate or the other housing is formed on the attaching surface
10
b
of the speaker frame
10
. The gasket
13
has a notch
13
a
which corresponds to the attaching screw section
14
. An outer peripheral surface of the gasket
13
is abutted to an inside of the outer peripheral rim
10
a
of the speaker frame
10
, thereby positioning the edge
12
which is fixed by the gasket
13
.
According to such a structure of the speaker, a size of the speaker frame
10
can be set by making the best use of a speaker setting area on a baffle plate or the other housing since the attaching screw section
14
is provided inside the outer peripheral rim
10
a
of the speaker frame
10
. However, since the gasket
13
is provided inside the outer peripheral rim
10
a
of the speaker frame
10
to fix the edge
12
, an outer diameter L′ formed by the edge
12
and the diaphragm
9
is restricted by a width of the gasket
13
. As a result, an inside area of the speaker frame
10
can not be effectively utilized as an oscillation area formed by the diaphragm
9
or the like. In other words, since an outputted sound pressure level of the speaker is in the relation of function with the oscillation area, the conventional structure of loudspeaker has any problem that it is difficult to obtain the enough level of the outputted sound pressure which corresponds to the inside area of the speaker frame
10
.
Further, since the gasket
13
is used for positioning and fixing the outer end of the edge
12
in this case, the number of parts are increased to cause a cost-up.
SUMMARY OF THE INVENTION
The present invention has been proposed in order to settle the above-mentioned problems. An object of the present invention is to provide a loudspeaker which can obtain an enough level of outputted sound pressure by means of effectively utilizing the inside area of the speaker frame as the oscillation area, and which can reduce the number of parts by the non-use of gasket.
According to the first aspect of the present invention, there is provided a loudspeaker comprising an edge at an outer periphery of a diaphragm, in which an outer end portion of the edge is attached upon an attaching surface formed at an inside of an outer peripheral rim of a speaker frame, wherein the outer end portion is formed with a direction to the inside from the outer most periphery of the edge, and has an outer periphery surface which is allowed to abut on the outer peripheral rim of the speaker frame.
According to the second aspect of the present invention, there is provided a speaker including the first aspect, further comprising an attaching screw section of the speaker frame provided on the attaching surface, wherein the outer end portion has a thicker wall portion than a thickness of a screw head of the attaching screw section, and a notch for avoiding the attaching screw section.
According to such a construction, the present invention performs the following function.
According to the first aspect of the present invention, the outer end portion, which is provided at an outer end of the edge, is formed with a direction to the inside from the outer most periphery of the edge, and is attached onto the attaching surface of the speaker frame. Thus, the outer periphery of the edge is allowed to approach the outer peripheral rim of the speaker frame as much as possible, thereby enlarging an outer diameter composed of the diaphragm and the edge to the maximum of the speaker frame. Consequently, the inside area of the speaker frame is effectively utilized as the oscillation area, so that enough level of outputted sound pressure can be secured.
In addition, since the outer peripheral surface of the outer end portion of the edge is allowed to abut on the outer peripheral rim of the speaker frame to perform the positioning of the edge, the positioning according to a gasket is unnecessary, and then the number of parts can be reduced.
According to the second aspect, in addition to the above function, a size of the speaker frame can be set largely by making the best use of a speaker setting area on a baffle plate or the other housing since the attaching screw section is provided inside the outer peripheral rim of the speaker frame. Further, the inside area of the speaker frame can be effectively utilized as the oscillation area.
Also, since the outer end portion formed at the outer end of the edge has a wall thickness thicker than the screw head of the attaching screw section, and the notch formed for avoiding the attaching screw section, the attaching screw can be prevented from exerting influence to the oscillation of the edge. In addition, according to the desired wall thickness of the outer end portion of the edge, the outer end portion can be bonded onto the attaching surface of the speaker frame, so that the same airtightness as one of gasket can be secured.
REFERENCES:
patent: 5115474 (1992-05-01), Tsuchiya et al.
patent: 6176345 (2001-01-01), Perkins et al.
patent: 6305491 (2001-10-01), Iwasa et al.
Ando Tomiaki
Suzuki Takashi
Arent & Fox PLLC
Le Huyen
Pioneer Corporation
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