Micro speaker

Details Micro speaker Micro speaker

2001-06-21

2003-04-22

Tran, Sinh (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S396000

Reexamination Certificate

active

06553126

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a micro speaker. Particularly, the present invention relates to a micro speaker in which when disassembling a protecting cover and a frame from each other, internal components are prevented from being damaged, an unnecessary squandering of resources is avoided, and an occurrence of a short circuit formation is also prevented during the installation of the speaker unit.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1
, the generally known speaker includes: a magnetic circuit part
1
consisting of a yoke part
1
b,
a magnet
1
a
mounted upon the yoke part
1
b,
and an upper plate
1
d
stacked upon the magnet
1
a
; an oscillating part
2
consisting of a bobbin
2
c
with a voice coil
2
a
wound thereon, an oscillating plate
2
d
and a damper
2
b
coupled to the outside of the bobbin
2
c,
a dust cap
2
e
for preventing a contaminating material from intruding into the bobbin
2
c,
and an edge
2
g
for connecting the oscillating plate
2
d
to a frame
4
a
; and a main body
4
consisting of the frame
4
a
for protecting the magnetic circuit part
1
and the oscillating part
2
, and a gasket
4
b
for fixing the oscillating plate
2
d
to the frame
4
a.
The conventional micro speaker is constituted as shown in FIG.
2
.
That is, a magnet
40
and an upper plate
50
are stacked in such a manner that a gap
30
should be formed within a frame
10
which has a magnetic circuit installing recess
20
, thereby forming a magnetic circuit
80
.
A voice coil
55
is wound on the lower portion of an oscillating plate
60
to be inserted into a gap
30
, and the oscillating plate
60
which has a coupling face
60
a
is coupled to the frame
10
.
A protecting cover
70
is secured to the top of the frame
10
, and a terminal
85
connects the voice coil
55
to the frame
10
.
In the above described micro speaker, the magnetic circuit
80
is secured into the frame, that is, into the recessed magnetic circuit securing part
20
. Further, the oscillating plate
60
with the coupling face
60
a
is secured to the frame
10
in such a manner that the voice coil
55
can be inserted into the gap
30
which is formed between the magnetic circuit
80
and the frame
10
.
The protecting cover
70
is fixed to the top of the frame
10
so as to protect the oscillating plate
60
and the magnetic circuit
80
. The voice coil
55
is grounded through the terminal
85
to the circuit board
90
.
Under this condition, if electrical signals are supplied through the terminal
85
to the voice coil
55
, then the flow of the magnetic fluxes which occurs within the gap
30
causes the electrical signals to be converted to sounds.
However, In this speaker, when the terminal
85
which is connected to the voice coil
55
is connected to the circuit board
90
, a short circuit is liable to be formed in the circuit board.
Further, if the magnetic circuit
80
or the oscillating plate
60
is defective, then the oscillating plate
60
and the frame
10
become unseparable from each other, with the result that the whole product has to be replaced, thereby bringing an otherwise unnecessary squandering resources. Further, when fixing the protecting cover, if the spreading of the bonding fluid is not perfectly uniform, then the bonding fluid may flow down to the oscillating plate
60
, thereby resulting in a split resonance.
Further, the magnetic circuit
80
which is bonded onto the frame
10
, the oscillating plate
60
which is inserted into the gap
30
, and the protecting cover
70
are all secured by spreading a bonding fluid and by drying it in a repeated manner. Accordingly, the time for the bonding procedure is extended.
SUMMARY OF THE INVENTION
The present invention is intended to overcome the above described disadvantages of the conventional techniques.
Therefore it is an object of the present invention to provide a micro speaker in which if the magnetic circuit and oscillating plate are defective, then the protecting cover is separated from the frame to replace only the defective element, the connecting portion of the terminal cord is prevented from being contacted to the circuit board so as to prevent the formation of a short circuit, the defective spreading of the bonding fluid is minimized during the spreading of the bonding fluid, and the time required for assembling the magnetic circuit and the oscillating plate is shortened to the minimum.
In achieving the above object, the micro speaker according to the present invention includes: a frame with a yoke integrally formed therein, and with a magnetic circuit securing recess formed therein; a magnetic circuit consisting of a magnet and an upper plate, leaving a gap between the inside wall of the magnetic circuit securing recess and the magnetic circuit; a protecting cover installed on the top of the frame, and having an oscillating plate installing recess, and having a terminal cord securing piece in a projecting form; and an oscillating plate bonded to the oscillating plate securing recess, and having a voice coil on its bottom, the voice coil being connected to the terminal cord.


REFERENCES:
patent: 5838809 (1998-11-01), Sato et al.
patent: 2000-224693 (2000-08-01), None

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