Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2000-10-20
2002-07-02
Le, Huyen (Department: 2643)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S417000, C381S420000
Reexamination Certificate
active
06415037
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a speaker, and more particularly to an improved speaker and the manufacturing method thereof, wherein winding is disposed and fixed onto the central position of the frame of speaker and is excited by electric current to generate varying magnetic lines for having a continuous attraction-repulsion effect there between with the magnetic member disposed at the corresponding position of the diaphragm of speaker, and thereby vertically sliding the magnetic member to cause the diaphragm to generate sound.
BACKGROUND OF THE INVENTION
Conventionally, speakers have been used widely in our daily life for about one hundred years. For example, a speaker is installed in a broadcasting system in a public place (such as railroad station, auditorium or the like), a warning device of motor vehicle, radio, TV, and Hi-Fi system etc. In view of the above, speakers really play an important role in the modern society.
The progress of electronic industry and material science is significant in recent years. A variety of electronic products have been commercially available due to the development of novel electronic components and manufacturing process. Such electronic products have the advantages of low manufacturing cost, high performance, and high quality. In addition, the progress of semi conductor manufacturing process has resulted in the micronization of semi conductor device which in turn has replaced the traditional electronic devices. Moreover, the market trend and demand of slim, light weight, and mini-sized electronic products has become dominant. Such significant progress has improved the convenience in use and portability of the electronic products. For example, “Walkman” and mini Hi-Fi are some of the typical consumer electronic products having the features of cheap and high quality being affordable by ordinary people. It is understood that electronic equipment, used for controlling the sound effect in the above consumer electronic products such as typical audio-video equipment and multi-media equipment, has been continuously reduced in size (i.e., miniaturized). However, the speaker mounted therein for outputting sound is still conventional bulky one, thus inhibiting the reduction of size and causing a bottle neck on the progress of audio quality and volume of such typical consuming electronic products which is difficult to be overcome by prior art techniques.
A conventional cone-shaped speaker
10
construction is shown in
FIG. 1
, which comprises a metal frame
11
in the periphery, a recessed resonant space
12
in the center enclosed by the metal frame
11
, a diaphragm
13
enclosed by the metal frame
11
being recessed on top of the resonant space
12
, a slidable sleeve
14
having one end connected to the center of diaphragm
13
, a winding
15
wound around the other end of sleeve
14
, a circular corrugated damping film
16
around the sleeve
14
between the diaphragm
13
and winding
15
, the damping film
16
being extended radially such that the outer circumference thereof is engaged with the metal frame
11
in a predetermined position within the resonant space
12
, an opening
17
on the central bottom portion of metal frame
11
, a seat
18
connected to the periphery of opening
17
, a first through hole
19
corresponding to adjacent opening
17
on the top side of seat
18
such that the portion of sleeve
14
having winding
15
wound thereon may insert into seat
18
through the bores of opening
17
and first through hole
19
, a second through hole
20
on the bottom side of seat
18
, a metal core
21
with a T-shaped cross-section having the vertical portion (i.e., post)
211
passed through the second through hole
20
and the bore of the portion of sleeve
14
having winding
15
wound thereon, and a permanent magnet
22
wound around the seat
18
.
The cross-sectional view of the above mentioned conventional speaker
10
is further shown in FIG.
2
. The winding
15
is excited to generate an electromagnetic effect when an electric current is flowed through. Then first magnetic lines are generated in the winding
15
. Also, second magnetic lines are generated in the permanent magnet
22
. Such first and second magnetic lines co-act each other to create a continuous attraction-repulsion effect. As such, the sleeve
14
having winding
15
wound thereon may slide vertically as magnitude and direction of current applied thereon being changed. In turn, the diaphragm
13
is vibrated to generate sound for outputting through speaker
10
.
But the previous design suffered from a number of disadvantages. For example, it is difficult to reduce size. Also, the bottle neck on the progress of quality and volume of the output sound effect remains hard to be overcome. The reasons for causing the above disadvantages are summarized as follow:
1. The seat
18
, core
21
, and permanent magnet
22
of the conventional speaker
10
are bulky and mounted on the side of metal frame
11
opposite the diaphragm
13
, thus inhibiting the further reduction of speaker size especially the thickness thereof.
2. The portion of sleeve
14
having winding
15
wound thereon is inserted into the seat
18
sandwiched between the limited gap between the post
211
of core
21
and the permanent magnet
22
. This increases the difficulty in assembly. Also, a not precisely maintained gap may adversely affect the quality of speaker
10
.
3. The position of core
21
around the seat
18
restricts the travel of sleeve
14
. As such, the portion of sleeve
14
having winding
15
wound thereon may collide core
21
when speaker
10
outputs high-power low-frequency sound waves. Such collision may deform sleeve
14
after a predetermined time of use, thereby degrading the output sound quality of speaker
10
.
4. There is an opening between sleeve
14
and diaphragm
13
. As such, a dust cover
23
is provided on the opening for preventing dust and/or foreign objects from entering into sleeve
14
to accumulate on the gap between the sleeve
14
and post
211
of core
21
. Otherwise, it may restrict the travel of sleeve
14
as illustrated in
FIGS. 1 and 2
.
SUMMARY OF THE INVENTION
In order to overcome the above drawbacks of prior art, the present invention provides an improved speaker and the manufacturing method thereof wherein a diaphragm is enclosed by the peripheral frame, a resonant space is in the center enclosed by frame and diaphragm, and a winding is around a center seat. The winding is excited by electric current flowed through to generate varying magnetic lines for creating a continuous attraction-repulsion effect there between with a magnetic member disposed at the corresponding position of the diaphragm, thereby vertically sliding the magnetic member to cause the diaphragm to generate sound.
In one aspect of the present invention a magnetic member is directly or indirectly fixed on the center of diaphragm such that the space occupied by the conventional seat, metal core, and permanent magnet is reduced, thereby significantly reducing the thickness of speaker.
In another aspect of the present invention winding is fixed on frame corresponding to the center of diaphragm such that a continuous attraction-repulsion effect is occurred on the magnetic member when the winding is excited which in turn vibrates the diaphragm to generate sound. This has the advantages of simplifying assembly, reducing manufacturing cost, increasing the travel of diaphragm, preventing distortion, and significantly enhancing the low-frequency characteristics and increasing power.
In still another aspect of the present invention a magnetic member is directly fixed on the center of diaphragm or indirectly fixed on the center of diaphragm through a slidable sleeve such that dust and/or foreign objects are prevented from entering into the gap between the winding and magnetic member through the center of diaphragm or the bore of slidable sleeve, thereby eliminating the provision of dust cover and un-restraining the possible travel of slidable sleeve.
The abo
Elecinic Corp.
Le Huyen
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