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    13.
    发明专利
    未知

    公开(公告)号：IT7925940D0

    公开(公告)日：1979-09-21

    申请号：IT2594079

    申请日：1979-09-21

    Applicant: RCA CORP

    Inventor： CHEN HSING-YAO ,  HUGHES RICHARD HENRY

    IPC: H01J29/50 ,  H01J29/48 ,  H01J29/51 ,  H01J29/56

    Abstract: The gun, for use in a television picture tube, comprises a cathode, an apertured control grid, and an apertured screen grid aligned in the order named. The screen grid aperture comprises a rectangular slot portion facing the control grid and a circular portion facing away from the control grid. The slot portion of the aperture, which has a width 2-5 times its depth, creates an astigmatic field that produces underconvergence of the electron beam in the vertical plane only, whereby to avoid and/or compensate for vertical flare distortion of the beam spot at off-center positions on the image screen.

    COLOUR PICTURE TUBES
    15.
    发明专利
    COLOUR PICTURE TUBES 未知

    公开(公告)号：IN165340B

    公开(公告)日：1989-09-23

    申请号：IN870CA1985

    申请日：1985-12-04

    Applicant: RCA CORP

    Inventor： CHEN HSING-YAO

    IPC: H01J29/50 ,  H01J29/56

    Abstract: An improved color picture tube has an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The main focus lens is formed by two spaced electrode members, each having three separate inline apertures therein, a center aperture and two side apertures. The improvement comprises each of the apertures in each of the focus lens electrodes having a shape that distorts a portion of the focus lens thereat, to at least partially compensate for an astigmatic effect within the tube that acts on an associated electron beam. The side apertures in both of the electrodes are nonsymmetrical about axes that pass through the respective side apertures and are perpendicular to the initial coplanar paths of the electron beams.

    16.
    发明专利
    未知

    公开(公告)号：FR2581245B1

    公开(公告)日：1989-07-07

    申请号：FR8606117

    申请日：1986-04-28

    Applicant: RCA CORP

    Inventor： CHEN HSING-YAO

    IPC: H01J29/50 ,  H01J29/51 ,  H01J29/58 ,  H01J29/80

    Abstract: The asymmetric beam focusing slot provides a two-part crossover of the electron beams. The slot has a length greater than the spacing between the outer apertures and a width greater than the diameter of the apertures. The screen grid also has an improved refraction lens which comprises a transversely disposed recessed portion including a substantially rectangularly-shaped central portion and substantially triangularly-shaped end parts. The refraction lens provides a compensating field between the screen grid and the main electron lens to offset any changes in the main electron lens caused by variations in the focus voltage in the main electron lens. The recessed portion has a length, extending in the plane of the electron beams, at least coextensive with the length of the slot, and a width, extending substantially orthogonal to the plane of the electron beams, substantially greater than the width of the slot. The recessed portion is surrounded by a peripheral rim which conforms to the shape of the recessed portion. The central part of the peripheral rim is remote from the center aperture, and the triangularly-shaped end parts of the rim are in proximity to the outer apertures, thereby affecting the electrostatic field in the vicinity of the outer apertures by tilting the field lines within the recessed portion.

    17.
    发明专利
    未知

    公开(公告)号：FR2540288B1

    公开(公告)日：1988-07-01

    申请号：FR8401284

    申请日：1984-01-27

    Applicant: RCA CORP

    Inventor： CHEN HSING-YAO

    IPC: H01J29/50 ,  H01J31/20 ,  H01J29/02

    Abstract: An inline electron gun in a color picture tube is improved by the addition of two slots that are spaced sufficiently close to and inward from the two apertures in a portion of the screen grid electrode facing an accelerating and focusing electrode. The slots cause a distortion of the electrostatic field formed between the two electrodes at the two apertures. The field distortion compensates for an opposite distortion within the main lens of the electron gun.

    19.
    发明专利
    未知

    公开(公告)号：FR2581245A1

    公开(公告)日：1986-10-31

    申请号：FR8606117

    申请日：1986-04-28

    Applicant: RCA CORP

    Inventor： CHEN HSING-YAO

    IPC: H01J29/50 ,  H01J29/51 ,  H01J29/58 ,  H01J29/80

    Abstract: The asymmetric beam focusing slot provides a two-part crossover of the electron beams. The slot has a length greater than the spacing between the outer apertures and a width greater than the diameter of the apertures. The screen grid also has an improved refraction lens which comprises a transversely disposed recessed portion including a substantially rectangularly-shaped central portion and substantially triangularly-shaped end parts. The refraction lens provides a compensating field between the screen grid and the main electron lens to offset any changes in the main electron lens caused by variations in the focus voltage in the main electron lens. The recessed portion has a length, extending in the plane of the electron beams, at least coextensive with the length of the slot, and a width, extending substantially orthogonal to the plane of the electron beams, substantially greater than the width of the slot. The recessed portion is surrounded by a peripheral rim which conforms to the shape of the recessed portion. The central part of the peripheral rim is remote from the center aperture, and the triangularly-shaped end parts of the rim are in proximity to the outer apertures, thereby affecting the electrostatic field in the vicinity of the outer apertures by tilting the field lines within the recessed portion.

    20.
    发明专利
    未知

    公开(公告)号：DE3614429A1

    公开(公告)日：1986-10-30

    申请号：DE3614429

    申请日：1986-04-29

    Applicant: RCA CORP

    Inventor： CHEN HSING-YAO

    IPC: H01J29/50 ,  H01J29/51 ,  H01J29/56 ,  H01J29/76

    Abstract: The asymmetric beam focusing slot provides a two-part crossover of the electron beams. The slot has a length greater than the spacing between the outer apertures and a width greater than the diameter of the apertures. The screen grid also has an improved refraction lens which comprises a transversely disposed recessed portion including a substantially rectangularly-shaped central portion and substantially triangularly-shaped end parts. The refraction lens provides a compensating field between the screen grid and the main electron lens to offset any changes in the main electron lens caused by variations in the focus voltage in the main electron lens. The recessed portion has a length, extending in the plane of the electron beams, at least coextensive with the length of the slot, and a width, extending substantially orthogonal to the plane of the electron beams, substantially greater than the width of the slot. The recessed portion is surrounded by a peripheral rim which conforms to the shape of the recessed portion. The central part of the peripheral rim is remote from the center aperture, and the triangularly-shaped end parts of the rim are in proximity to the outer apertures, thereby affecting the electrostatic field in the vicinity of the outer apertures by tilting the field lines within the recessed portion.

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