Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Reexamination Certificate
2001-03-09
2002-06-11
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
C313S410000, C313S412000, C313S442000, C335S210000, C335S212000, C335S213000, C335S214000
Reexamination Certificate
active
06404118
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deflection yoke, and in particular, to a deflection yoke for preventing fluctuation of the deflection yoke by maintaining a firm engaged state while preventing fracture and damage thereof caused by an assembling shock generated when assembling the printed circuit board.
2. Description of the Prior Art
In general, a deflection yoke is employed for a TV set or a cathode ray tube (CRT) of a monitor to accurately deflect three-color beams scanned from an electron gun to a fluorescent screen coated on a screen of the CRT. The deflection yoke, which is the most significant factor of the magnetic devices of the CRT, plays a role of deflecting electron beams scanned from the electron gun so that the electric signals transmitted in time series can be reproduced as an image on the screen of the CRT.
To be specific, electron beams emitted from the electron gun travel straight forward the screen due to a high voltage, and illuminate a fluorescent body only at the center of the screen. Therefore, the deflection yoke plays a role of deflecting the electron beams so as to reach the screen in the order of being scanned from outside. This deflection yoke forms a magnetic field and uses a change of progressive direction by receiving power of the electron beams passing through the magnetic field so as to accurately deflect the electron beams to the coated fluorescent screen.
FIG. 1
is a side-elevational view of an ordinary CRT. As shown in
FIG. 1
, a deflection yoke
4
located at an RGB electron gun section
3
of a CRT
1
deflects electron beams scanned from an electron gun
3
a
to a fluorescent screen coated on a screen surface
2
.
This deflection yoke
4
comprises a pair of coil separators
10
symmetrically coupled in upper and lower directions.
The coil separator
10
provided for insulating a horizontal deflection coil
15
and a vertical deflection coil
16
as well as for assembling the same at proper positions comprises a screen section
11
a
engaged with a screen surface of the CRT
1
, a rear cover
11
b
, and a neck section
12
integrally elongated from the central surface of the rear cover
11
b
to be engaged with the electron gun section
3
.
A horizontal deflection coil
15
and a vertical deflection coil
16
are provided on internal and outer peripheral surfaces of the coil separator
10
for forming a horizontal deflection magnetic field and a vertical deflection magnetic field with a power supply applied from outside.
A pair of ferrite cores
14
composed of a magnetic body are provided to surround the vertical deflection coil
16
for consolidating the vertical deflection magnetic field generated from the vertical deflection coil
16
.
When a sawtooth pulse is applied to the horizontal deflection coil
15
and the vertical deflection coil
16
, the deflection yoke
4
comprised as above determines a scanning position on the screen by deflecting the electron beams of red (R), green (G) and blue (B) emitted from the electron gun
3
a
of the CRT due to a magnetic field generated according to the Fleming's left-hand rule.
Meanwhile, the deflection yoke as shown in
FIG. 1
is roughly classified into a saddle-saddle type deflection yoke as shown in
FIGS. 2 and 3
, and a saddle-toroidal type deflection yoke as shown in
FIGS. 4 and 5
in accordance with a winding structure of the coil.
In the saddle-saddle type deflection yoke shown in
FIGS. 2 and 3
, the horizontal deflection coil
15
of a saddle shape is installed on upper and lower sides of the internal periphery of the screen section of the coil separator
10
of a cone shape.
To reinforce the magnetic field of the vertical deflection coil
16
, the ferrite cores
14
of a cylindrical shape are provided on an external surface of the screen section
11
a
of the coil separator
10
.
A coma-free coil (not shown in the drawings) is installed around an external periphery of the neck section
12
of the coil separator
10
for correcting coma generated by the vertical deflection coil
16
.
FIGS. 4 and 5
are views showing an ordinary deflection yoke of a saddle-toroidal type. A horizontal deflection coil is installed on upper and lower sides of the internal peripheral surface of the screen section
11
a
of the coil separator
10
of a cone shape, and the ferrite cores
14
of a cylindrical shape are provided on an outer peripheral surface of the screen section
11
a
. A vertical deflection coil
16
of a toroidal type is wound along the upper and lower sides of the ferrite cores
14
.
A coma-free coil (not shown in the drawings) is additionally installed around the periphery of the neck section
12
of the coil separator
10
for correcting coma generated by the vertical deflection coil
16
.
In the saddle-saddle type deflection yoke and the saddle-toroidal type deflection yoke, a printed circuit board is additionally installed on one side surface of the coil separator
10
for supplying power to the aforementioned horizontal deflection coil
15
and the vertical deflection coil
16
.
FIGS. 6 and 7
are views illustrating assembled states of the printed circuit board in the conventional deflection yoke. As shown in
FIGS. 6 and 7
, a printed circuit board
100
is engaged with a side surface of the rear cover
11
b
of the coil separator
10
for electrically connect the deflection coils and diverse electric automotive equipments.
A plurality of penetrating holes
110
are formed at predetermined positions of the printed circuit board
100
with regular intervals. A pair of hook flaps
200
are protruded from the rear cover lib corresponding to the penetrating holes
110
for fixing the printed circuit board
100
without fluctuation.
Here, in the pair of hook flaps
200
, protrusions
210
having a triangular flap shape, i.e., slopes extended from a front end to a rear end thereof, are formed at end portions thereof so as to be suspended on one side surface of the printed circuit board
100
upon penetration of the penetrating holes
110
.
The pair of hook flaps
200
are distanced to be slightly farther than the distance between the pair of penetrating holes
110
so that one surface perpendicular to the protrusions
210
, i.e., the suspending threshold can support one side surface of the printed circuit board
100
after being elastically inserted to the penetrating holes
110
.
Supporting ribs
220
are elongated to the hook flaps
200
so that the protrusions
210
penetrating the penetrating holes
110
press one side surface of the printed circuit board
100
when in contact with the other side surface of the printed circuit board
100
.
The supporting ribs
220
having a predetermined area in a board plank shape is provided to extensively support one side surface of the printed circuit board.
In other words, the protrusions
210
integrally formed with the hook flaps
200
and the supporting ribs
220
fix the printed circuit board
100
by being in contact with the respective sides of the printed circuit board
100
.
In the conventional deflection yoke having the above construction, the printed circuit board
100
is fixed onto the coil separator
100
, i.e., on the rear cover
11
b
, by being suspended by the hook flaps
200
integrally protruded from the rear cover
11
b
and by being supported by the supporting ribs
220
elongated to the hook flaps
200
.
However, such a conventional deflection yoke poses the following problems as the assembling structure between the printed circuit board
100
and the rear cover
11
b
is made by the pair of hook flaps
200
and the penetrating holes
110
.
To be specific, as shown in
FIG. 7
, a worker needs to forcibly insert the printed circuit board
100
to the hook flaps
200
in order to fix the printed circuit board
100
onto the rear cover
11
b
. In this process, the assembling force laid on the printed circuit board
100
by the worker causes a fracture of the printed circuit board
100
or a deformation of the hook flaps
200
.
Moreover, the printed circuit board
Darby & Darby
Patel Nimeshkumar D.
Roy Sikha
Samsung Electro-Mechanics Co. Ltd.
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