Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Reexamination Certificate
1998-12-28
2003-01-07
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
C335S210000, C335S213000
Reexamination Certificate
active
06504295
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a display device for displaying a picture, and more particularly, the present invention relates to a deflection yoke and a convergence yoke which are mounted to an electron gun section of a cathode ray tube (CRT) for deflecting electron beams emitted from electron guns and performing a positive convergence adjustment of the electron beams, respectively.
2. Description of the Prior Art
Referring to
FIGS. 1 and 2
, there is illustrated a television receiver which is most widely used as a displayer.
The television receiver includes a cathode ray tube
1
, deflecting means, and clamping means. The cathode ray tube
1
is made of glass. A screen
2
on which a fluorescent layer (not shown) is applied is disposed at a front portion of the cathode ray tube
1
, and a neck
4
in which electron guns
3
are mounted is disposed on a rear portion of the cathode ray tube
1
.
The neck
4
of the cathode ray tube
1
is provided with the deflecting means which precisely focuses electron beams emitted from the electron guns
3
onto the fluorescent layer applied on the screen
2
.
The deflecting means includes a deflection yoke
5
fitted around the neck
4
, and a convergence yoke
6
fitted around the neck
4
at the rear of the deflection yoke
5
.
The deflection yoke
5
functions to horizontally and vertically deflect the electron beams emitted from the electron guns
3
by horizontal and vertical deflecting coils which are wound around circumferential inner and outer surfaces thereof, respectively, and precisely focus the electron beams onto the fluorescent layer applied on the screen
2
to reproduce a picture.
The convergence yoke
6
functions to perform a positive convergence adjustment for precisely focusing the electron beams emitted from the electron guns
3
onto a center of the screen
2
.
In the meanwhile, the deflecting means, that is, the deflection yoke
5
and the convergence yoke
6
must be maintained in a securely clamped state onto the neck
4
of the cathode ray tube
1
.
For this reason, a yoke clamp
7
as shown in
FIGS. 1 and 2
, is provided as a means for clamping the deflection yoke
5
and the convergence yoke
6
onto the neck
4
of the cathode ray tube
1
.
In other words, the deflection yoke
5
and the convergence yoke
6
which constitute the deflecting means are formed with neck parts
5
a
and
6
a
, respectively. The neck parts
5
a
and
6
a
are fitted around the neck
4
of the cathode ray tube
1
. By fastening the yoke clamp
7
around the neck parts
5
a
and
6
a
by the fastening screw S, the deflection yoke
5
and the convergence yoke
6
are clamped to the neck
4
of the cathode ray tube
1
.
However, in the deflection device of the prior art, constructed as mentioned above, in the process of clamping the deflection yoke
5
and the convergence yoke
6
constituting the deflecting means by the clamping means, that is, the yoke clamp
7
, a thread of the fastening screw S may be worn out, whereby a stable clamping cannot be ensured.
Also, in the process of clamping the deflection yoke
5
and the convergence yoke
6
to the neck
4
of the cathode ray tube
1
by the fastening screw S and the yoke clamp
7
, a load may be concentrated onto a portion of the neck
4
of the cathode ray tube
1
, and therefore, the cathode ray tube
1
made of glass is apt to be broken.
Moreover, a separate clamping tool is necessary to fasten the yoke clamp
7
around the deflection yoke
5
and the convergence yoke
6
by the fastening screw S, and specifically, in the course of locking the fastening screw S into the yoke clamp
7
, it is difficult to achieve a uniform locking.
Accordingly, due to the fact that the deflecting means is easily moved by an outside shock, deflections of the electron beams are not precisely performed, and as a result, quality of a picture is deteriorated, whereby reliability of an end product is diminished.
SUMMARY OF THE INVENTION
Accordingly, the present invention has been made in an effort to solve the problems occurring in the prior art, and a primary object of the present invention is to provide a display device in which a deflection yoke is stably clamped to an electron gun section of a cathode ray tube to precisely deflect electron beams toward a fluorescent layer.
Another object of the present invention is to provide a display device in which a convergence yoke is stably clamped to an electron gun section of a cathode ray tube to precisely perform a positive convergence adjustment of electron beams.
Still another object of the present invention is to provide the deflection yoke which is stably clamped to the electron gun section of the cathode ray tube to precisely deflect electron beams toward the fluorescent layer.
Yet still another object of the present invention is to provide a convergence yoke which is stably clamped to the electron gun section of the cathode ray tube to precisely perform the positive convergence adjustment of electron beams.
According to one aspect of the present invention, there is provided a display device comprising: a cathode ray tube having a screen on which a fluorescent layer is applied and an electron gun section in which electron guns are mounted; a deflection yoke including a coil separator having a neck part which is fitted around the electron gun section of the cathode ray tube, and horizontal and vertical deflecting coils which are disposed on circumferential inner and outer surfaces of the coil separator, respectively; first locking means arranged on the neck part of the coil separator; and clamping means fitted around the neck part of the coil separator and having second locking means, the second locking means cooperating with the first locking means for locking the deflection yoke to the electron gun section of the cathode ray tube.
According to another aspect of the present invention, there is provided a display device comprising: a cathode ray tube having a screen on which a fluorescent layer is applied and an electron gun section in which electron guns are mounted; a convergence yoke having a cylindrical body which is fitted around the electron gun section of the cathode ray tube, and a plurality of pole pieces arranged on a circumferential outer surface of the cylindrical body such that two adjoining pole pieces are spaced from each other by a predetermined distance; first locking means arranged on the cylindrical body of the convergence yoke; and clamping means having second locking means, the second locking means cooperating with the first locking means for locking the convergence yoke to the electron gun section of the cathode ray tube.
According to still another aspect of the present invention, there is provided a deflection yoke coupled to an electron gun section of a cathode ray tube having a screen on which a fluorescent layer is applied, for deflecting electron beams emitted from electron guns mounted in the electron gun section toward the fluorescent layer of the screen, the deflection yoke comprising: a coil separator having a neck part which is fitted around the electron gun section of the cathode ray tube and has first locking means arranged on a circumferential outer surface thereof; a horizontal deflecting coil disposed on a circumferential inner surface of the coil separator for forming a horizontally deflecting magnetic field; a vertical deflecting coil disposed together with a ferrite core on a circumferential outer surface of the coil separator for forming a vertically deflecting magnetic field; and clamping means fitted around the neck part of the coil separator and having second locking means, the second locking means cooperating with the first locking means for locking the coil separator to the electron gun section of the cathode ray tube.
According to yet still another aspect of the present invention, there is provided a convergence yoke coupled to an electron gun section of a cathode ray tube having a screen on which a fluorescent layer is applied, for performing a po
Patel Ashok
Samsung Electro-Mechanics Co. Ltd.
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