Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Reexamination Certificate
1998-05-21
2001-01-23
Day, Michael H. (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
C313S442000, C335S212000, C335S213000
Reexamination Certificate
active
06177760
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deflection yoke device provided with a compensation coil which comprises a cylindrical bobbin, coils wound around the bobbin and a magnetic core installed in the bobbin, wherein a misconvergence is compensated by displacing the core to an optimum position in the bobbin.
2. Description of the Related Art
FIG. 1
is a perspective and partially cutaway view a deflection yoke device in the prior art;
FIG. 2
is a perspective view showing a compensation coil shown in
FIG. 1
;
FIG. 3
is a sectional view showing the compensation coil shown in FIG.
2
.
In
FIG. 1
, a pair of horizontal deflection yoke coils
3
a
,
3
b
and a pair of vertical deflection yoke coils
2
, each wound in a saddle shape, are respectively provided on inner and outer surfaces of a separator
1
having a cone shape for supporting these vertical and horizontal deflection yoke coils
3
a
,
3
b
and
2
and for electrically insulating the vertical and horizontal deflection yoke coils
3
a
,
3
b
and
2
from each other. Further, an outside of the vertical deflection coils
2
is covered by a core
4
having a cone shape and made of a magnetic material such as ferrite.
In the deflection yoke device, it is needed a circuit for compensating a deflection characteristic. A printed circuit board
5
for mounting such a circuit and electric parts is provided on a side portion of the separator
1
, for instance, being extended from a first flange section
1
a
having a large diameter to a second flange section
1
b
having a smaller diameter.
On the printed circuit board
5
, there are defined a plurality of approximately rectangular holes
5
a
. The printed circuit board
5
is fixed on a side section of the separator
1
by causing an end thereof to engage with an engage section
1
a
1
integrally formed on the first flange section
1
a
and causing the rectangular holes
5
a
to engage with nails
1
b
1
integrally formed on the second flange section
1
b.
On the printed circuit board
5
, there is also mounted a compensation coil
7
for compensating a misconvergence as explained hereinafter. Specifically, the compensation coil
7
is fixed on the printed circuit board
5
by causing nails
7
a
formed at distal ends thereof in a longitudinal direction to be engaged with the rectangular holes
5
a
,
5
a
of the printed circuit board
5
.
Further, on the second flange section
1
b
, there is provided a compensation coil
6
having four poles for compensating a coma error, so-called VCR. Here, a reference character
9
denotes a connector for connecting the deflection yoke device to a power source (not shown).
Furthermore, on the printed circuit board
5
, there are erected plural terminals
8
for connecting leads
2
′ of the vertical deflection coil
2
, leads
3
a
′,
3
b
′ of the horizontal deflection coils
3
a
,
3
b
, and lead
6
′ of the compensation coil
6
, and lead
9
′ of the connector
9
by soldering (not shown).
Here, a description is given of a construction and an operation of the compensation coil
7
.
As shown in
FIG. 2
, the compensation coil
7
comprises a bobbin
10
, coils
11
,
12
and a core
13
. On the bobbin
10
made of an insulative material, there are wound a first coil
11
between the flanges
10
b
,
10
c
to be electrically connected to the horizontal deflection coil
3
a
and a second coil
12
between the flanges
10
d
,
10
e
to be electrically connected to the horizontal deflection coil
3
b.
In the bobbin
10
, there is defined a cave
10
a
having an approximately cylindrical shape in a longitudinal direction of the bobbin
10
. In the cave
10
a
, there is fitted a core (referred to as a screwed core hereinafter)
13
having an external thread on an outer surface thereof.
As shown in
FIG. 3
, plural projection ribs
15
are integrally formed on the inner surface of the cave
10
a
of the bobbin
10
being extended in the longitudinal direction of the bobbin, and the screwed core
13
is forcibly engaged with the ribs
15
of the cave
10
a
in the bobbin
10
.
Further, the screwed core
13
is defined with a hexagonal hole
13
a
penetrating in the longitudinal direction of the bobbin
10
.
FIG. 4
is a sectional view of the compensation coil for explaining an installment operation of a screw core to a bobbin of the compensation coil manually;
FIG. 5
is a sectional view of compensation coil for explaining the installment operation of the screw core to the bobbin of the compensation coil automatically;
FIG. 6
is a sectional view of the compensation coil for explaining the installment operation of the screw core to the bobbin of the compensation coil;
FIG. 7
is a circuit for connecting the horizontal deflection coils
3
a
,
3
b
and the compensation coils
7
,
70
,
71
,
72
and
FIG. 8
is a misconvergence pattern which is compensated by the compensation coils.
In
FIG. 4
, a reference character
14
designates a jig for rotating the screwed core
13
. The distal end of the jig
14
is made to be hexagonal to allow the distal end to be inserted into the hexagonal hole
13
a
of the screwed core
13
. When the screwed core
13
is manually screwed into the cave
10
a
from, for instance, the left side of the bobbin
10
with the jig
14
, the screwed core
13
is installed in the bobbin
10
, cutting a thread on the projection rib
15
. For simplicity, the thread is not depicted in FIG.
4
.
In
FIG. 4
, the screw core
13
is manually installed in the bobbin
10
. However, in the mass production the screwed core
13
is automatically inserted into the bobbin
10
by an automatic machine.
In
FIGS. 5 and 6
, a reference character
16
denotes an automatic machine for inserting the screwed core
13
into the cave
10
a
by rotating the screw core
13
. The distal end
16
a
of the automatic machine
16
has a hexagonal shape to allow the distal end to be inserted into the hexagonal hole
13
a
of the screw core
13
.
As shown in
FIG. 5
, first, the screwed core
13
is screwed into the cave
10
a
from one end of the bobbin
10
. Then, the screwed core
13
is transferred being screwed in until another end of the bobbin
10
. Thereby, an internal thread is cut on the projection rib
15
in a longitudinal direction of the bobbin
10
.
Next, the screwed core
13
is rotated in a reverse direction so that the screwed core
13
is approximately positioned at a center of the bobbin
10
in the longitudinal direction as shown in
FIGS. 2 and 4
.
The compensation coil
7
constructed as mentioned above is installed on the deflection yoke device as explained referring to
FIG. 1
, and is electrically connected to the horizontal deflection coils
3
a
,
3
b
as shown in FIG.
7
.
Specifically, the horizontal deflection coils
3
a
,
3
b
are connected in parallel to each other and between a plus terminal (+) and a minus terminal (−), and coils
11
,
12
of the compensation coil
7
are connected in series to each other and between the horizontal deflection coils
3
a
,
3
b
as shown in FIG.
7
. Upon operation, the currents I
a
, I
b
flow through the horizontal deflection coils
3
a
,
3
b
, respectively.
Upon a delivery inspection, the abovementioned deflection yoke device is mounted on an inspection CRT to allow the adjustment of the deflection characteristics as mentioned hereinafter. Further, the inspection CRT refers to a CRT designated by a maker, so-called ITC (Integrated Tube Component) maker which sells such a deflection yoke device combined with a CRT characteristically matched to the deflection yoke.
Before delivering the deflection yoke device to the ITC maker, the deflection yoke device is mounted on the inspection CRT as shown in
FIG. 1
, and a worker differentially changes the inductances L
11
and L
12
of the coils
11
and
12
by rotating and transferring the screw core
13
in a B-B′ direction as shown in
FIG. 4 and 17
.
Thereby, the currents I
a
and I
b
flowing through the horizontal deflection coils
3
a
,
Fukui Kinji
Hatakeyama Naoki
Ikeda Kenichi
Koga Takasuke
Morimoto Keiji
Anderson Kill & Olick P.C.
Day Michael H.
Guharay Karabi
Victor Company of Japan Ltd.
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