Low-voltage bobbin for preventing sockets from displacing

Details Low-voltage bobbin for preventing sockets from displacing Low-voltage bobbin for preventing sockets from displacing

2000-01-24

2001-12-11

Mai, Anh (Department: 2832)

Inductor devices

With outer casing or housing

C336S192000, C336S065000, C336S198000

Reexamination Certificate

active

06329896

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a low-voltage bobbin, and more particularly, to a low-voltage bobbin of a flyback transformer.
BACKGROUND OF THE INVENTION
A flyback transformer is generally implemented within the circuits of a display device for providing distinctive voltages required by the circuits operation of the display device. Some U.S. Patents, i.e. U.S. Pat. Nos. 5,160,872, 5,287,479 and 4,144,480 may be referred in order to have an in-depth understanding of structures of the flyback transformer and functions of the High Voltage output, Focus output and Screen output of the flyback transformer.
Please refer to
FIGS. 1 and 2
.
FIG. 1
is a schematic diagram of a flyback transformer
10
according to the prior art.
FIG. 2
is an exploded diagram of the flyback transformer
10
shown in FIG.
1
. Flyback transformer
10
of the prior art comprises a low-voltage bobbin
12
, a high-voltage bobbin
14
, an upper core
16
, a lower core
18
and a housing
20
. The assembly procedure of the flyback transformer
10
comprises: first, installing a winding shaft (not shown) of the low-voltage bobbin
12
into a shaft hole (not shown) of the high-voltage bobbin
14
; secondly, installing the low-voltage bobbin
12
and high-voltage bobbin
14
into the housing
20
; finally, mounting the upper and lower cores
16
,
18
on the low-voltage bobbin
12
to form the flyback transformer
10
.
In general, a clip
22
is often used to mount the upper and lower cores
16
,
18
on the low-voltage bobbin
12
within the assembly procedure of the flyback transformer
10
. The clip
22
is made of nonmagnetic metallic material with good flexibility to achieve the purpose of mounting the upper and lower cores
16
,
18
. However, the use of clip
22
increases the cost, and more particularly, a side opening
25
must be provided on the low-voltage bobbin
12
for receiving the lower core
18
. Finally, it always leads to decrease the structural rigidity of the low-voltage bobbin
12
. As a result, a shrinkage problem arises within the injection process of the low-voltage bobbin
12
. A plurality of sockets
24
provided on the low-voltage bobbin
12
would displace and fail to comply with the original design requirement.
Based on the above issues, a re-positioning process of the sockets is usually required during the injection process between the low-voltage bobbin
12
and the high-voltage bobbin
14
in order to enforce a pin
26
corresponding to each socket
24
back to its original position as possible. Nevertheless, the result of the re-positioning process also fails to comply with the original design requirement because of stress recovery.
Please refer to FIG.
3
.
FIG. 3
is a schematic diagram of a reinforced rib
28
of the low-voltage bobbin
12
according to the prior art. With respect to the above-mentioned problem of socket displacement in the low-voltage bobbin
12
, a rectangular reinforced rib
28
is provided on a skirt
29
to increase the structural rigidity of the low-voltage bobbin
12
. However, the existence of the reinforced rib
28
will affect the assembly procedure of the upper and lower cores
16
,
18
. Therefore, the reinforced rib
28
should be punched off to create said side opening
25
for receiving the lower core
18
before the assembly procedure of the upper and lower cores
16
,
18
.
SUMMARY OF THE INVENTION
This invention provides a low-voltage bobbin of a flyback transformer. The flyback transformer comprises a low-voltage bobbin, a lower core and an upper core. The low-voltage bobbin comprises a main body and a reinforced device. The main body comprises a skirt and a winding shaft. The skirt has a lower opening for receiving the lower core. A plurality of sockets are provided on a side portion of the skirt. The winding shaft is provided on the skirt and has an upper opening for receiving the upper core. The reinforced device is provided on the skirt for reinforcing rigidity of the main body and preventing the plurality of sockets from displacing. In addition, the reinforced device comprises three ribs integrally formed on a flange of the skirt. Each rib is vertically connected with each other to form a hole. The lower core engages with the low-voltage bobbin through the hole according to a predetermined assembly procedure. Therefore, the flyback transformer applied with the low-voltage bobbin of the present invention will no longer apply a clip for mounting the upper and lower cores. The product cost will be reduced and the socket displacement of the low-voltage bobbin will be solved by applying the present invention.


REFERENCES:
patent: 4475097 (1984-10-01), Kikuchi
patent: 4499522 (1985-02-01), Nakamura
patent: 6010362 (2000-01-01), Caviness et al.
patent: 7-75339 (1995-03-01), None
patent: 7-249532 (1995-09-01), None

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