Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Reexamination Certificate
1999-07-09
2001-05-01
Wong, Don (Department: 2821)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
C315S368250, C313S440000
Reexamination Certificate
active
06225764
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C. §119 from an application for Linearity Correction Coil Device and Video Display Apparatus Using The Same earlier filed in the Korean Industrial Property Office on Jul. 14, 1998 and there duly assigned Serial Nos. 28450/1998 and 28449/1998.
1. Field of the Invention
The present invention relates to alinearity correction coil device of a video display apparatus, and more particularly, to a linearity correction coil device and a video display apparatus using the same, which are capable of increasing resolution of a video displayed on a cathode-ray tube (hereinafter, referred to as CRT) by improving a structure of the linearity correction coil device installed on a printed circuit board for the CRT and an installation method thereof.
2. Description of the Prior Art
In general, a computer system adopts the CRT as a device for displaying a video. The CRT display contains circuitry containing a horizontal/vertical deflector. This horizontal/vertical deflector contains a horizontal deflecting yoke coil and a linearity coil in series with the horizontal deflecting yoke coil. As is generally the case, the linearity coil is either placed on the neck of the CRT or located on a printed circuit board beneath the CRT. U.S. Pat. No. 5,350,980 for a Nonlinear Inductor With Magnetic Field Reduction to Dye et al. discloses the linearity coil placed in a vertical direction on the printed circuit board, allowing magnetic flux lines from the coil to interact with the electron beams inside the CRT causing deflection of the electron beam.
What is needed is an arrangement whereby there is little or no unwanted interaction between the linearity coil and the electron beams within the CRT. To achieve this, the linearity coil can be placed on its side instead of in an up-and-down direction. With this orientation of the linearity coil on the printed circuit board, deflection of electron beams inside the CRT is greatly reduced. In order to place a linearity coil on its side in a printed circuit board, a case for holding the linearity coil is needed to provide electrical connections between the linearity coil and the printed circuit board.
SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide a linearity correction coil device capable of increasing resolution of a video displayed on the CRT by improving a structure of the linearity correction coil device installed on a printed circuit board for the CRT.
It is another object of the present invention to provide a video display apparatus capable of increasing resolution of a video displayed on CRT by improving an installation method of the linearity correction coil device installed on a printed circuit board for the CRT.
It is still another object to orient the linearity coil on a printed circuit board sideways instead of up-and-down to reduce harmful interaction between the magnetic field generated by the linearity coil and the path of the electron beams inside the CRT.
It is yet another object to provide a holder for the linearity coil so that the linearity coil can establish discrete electrical connections with the printed circuit board.
In order to achieve the above objects, the present invention provides a video display apparatus using a linearity correction coil device, which comprises:
a cathode-ray tube for generating an electron beam;
a deflecting yoke for deflecting the electron beam; and
a linearity correction coil device, which is connected with said deflecting yoke in series, for compensating a linearity of the electron beam;
wherein said linearity correction coil device is installed on a printed circuit board for said cathode-ray tube, and wherein a vertical length of said linearity correction coil in an intersecting direction to a progressive direction of the electron beam has a shorter length than a horizontal length of said linearity correction coil device in a parallel direction to the progressive direction of the electron beam.
In order to achieve the above objects, the present invention provides a video display apparatus using a linearity correction coil device, which comprises:
a cathode-ray tube for generating an electron beam;
a deflecting yoke for deflecting the electron beam; and
a linearity correction coil device, which is connected with said deflecting yoke in series, for compensating a linearity of the electron beam;
wherein said linearity correction coil device comprises:
a linearity correction coil including a magnetic core having a first flange at one end portion of said magnetic core, a second flange at another end portion of said magnetic core, and a winding core portion for combining said first flange and said second flange; a winding wound around said winding core portion of said magnetic core; and a permanent magnet combined with either said first flange or said second flange, an axis extending through the center of said first flange, said second flange, said magnetic core, said winding, and said permanent magnet; and
a case for supporting said linearity correction coil placed on an upper surface of said case and having contact pins that one end portions of each of the contact pins are respectively connected with both end portions of said winding and other end portions of each of the contact pins are connected with said printed circuit board, wherein said linearity correction coil device is horizontally installed on a printed circuit board for said cathode-ray tube so that said axis is parallel to a surface on said printed circuit board wherein each point on said axis is equidistant from said surface of said printed circuit board.
In order to achieve the above objects, the present invention provides a video display apparatus using a linearity correction coil device, which comprises:
a cathode-ray tube for generating an electron beam;
a deflecting yoke for deflecting the electron beam; and
a linearity correction coil device, which is connected with said deflecting yoke in series, for compensating a linearity of the electron beam;
wherein said linearity correction coil device comprises:
a linearity correction coil including a magnetic core having a first flange at one end portion of said magnetic core, a second flange at another end portion of said magnetic core, and a winding core portion for combining said first flange and said second flange; a winding wound around said winding core portion of said magnetic core; and a permanent magnet combined with either said first flange or said second flange; and
a case for supporting said linearity correction coil placed on an upper surface of said case and having guide grooves formed in both peripheral portions of a body thereof to guide both end portions of said winding, projections formed in a lower surface of said case and contact pins formed in the lower surface to be connected with the both end portions of said winding guided through the guide grooves,
wherein said linearity correction coil device is horizontally installed on a printed circuit board for said cathode-ray tube for a vertical length which vertically intersects with a progressive direction of the electron beam to have a shorter length than a horizontal length which is parallel with the progressive direction of the electron beam.
In order to achieve the above objects, the present invention provides a linearity correction coil device, which comprises:
a linearity correction coil including a magnetic core having a first flange at one end portion of said magnetic core, a second flange at another end portion of said magnetic core, and a winding core portion for combining said first flange and said second flange; a winding wound around said winding core portion of said magnetic core; and a permanent magnet combined with either said first flange or said second flange; and
a case for supporting said linearity correction coil placed on an upper surface of said case and having guide grooves formed in both peripheral portions of a body thereof to guide both end po
Ha Yong-Su
Shim Jae-Gyou
Bushnell , Esq. Robert E.
Samsung Electronics Co,. Ltd.
Tran Thuy Vinh
Wong Don
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