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US 6,326,745 B1Granted
Cathode-ray tube apparatus
AssigneeKabushiki Kaisha Toshiba
InventorMasahiro Yokota
Life of this patent
Estimating the term…
Abstract
In a cathode-ray tube including a modulator, the modulator has different settings in the intermediate portion and in the peripheral portions of the picture so that the change of inductance along the horizontal axis on the phosphor screen or the change of inductance along the vertical axis on the phosphor screen compensates the difference of distortion between the intermediate portion and the peripheral portions of the picture.
Claims20
A cathode-ray tube apparatus comprising:
- a vacuum envelope including a substantially rectangular panel having a phosphor screen on an inner surface thereof and having a horizontal and a vertical axis, a funnel fixed to the panel, and a neck connected to a reduced-diameter portion of the funnel;
- an electron gun arranged in the neck, for emitting electron beams towards the phosphor screen;
- a deflecting yoke mounted on the reduced-diameter portion of the funnel and on the circumference of the neck, for deflecting the electron beams so that the phosphor screen is scanned in the horizontal and vertical directions, the deflecting yoke having horizontal deflecting coils for deflecting the electron beams in the horizontal direction, and vertical deflecting coils for deflecting the electron beams in the vertical direction;
- and
- a modulator having saturated coils connected to the horizontal deflecting coils, a saturating control coils connected to the vertical deflecting coils, saturable cores around which the saturated coils or the saturating control coils are wound, and magnets biasing the saturable cores magnetically,
- wherein the modulator has different settings in an intermediate portion and in peripheral portions of a picture formed on the phosphor screen so that the change of inductance of the saturating control coils in the horizontal axis direction compensates the difference of North-South distortion between the intermediate portion and the peripheral portions of the picture with respect to the vertical axis direction.
3 more elements
A cathode-ray tube apparatus comprising:
- a vacuum envelope including a substantially rectangular panel having a phosphor screen on an inner surface thereof and having a horizontal and a vertical axis, a funnel fixed to the panel, and a neck connected to a reduced-diameter portion of the funnel;
- an electron gun arranged in the neck, for emitting electron beams towards the phosphor screen;
- a deflecting yoke mounted on the reduced-diameter portion of the funnel and on the circumference of the neck, for deflecting the electron beams so that the phosphor screen is scanned in the horizontal and vertical directions, the deflecting yoke having horizontal deflecting coils for deflecting the electron beams in the horizontal direction, and vertical deflecting coils for deflecting the electron beams in the vertical direction;
- and
- a modulator having saturated coils connected to the horizontal deflecting coils, a saturating control coils connected to the vertical deflecting coils, saturable cores around which the saturated coils or the saturating control coils are wound, and magnets biasing the saturable cores magnetically,
- wherein the modulator has different settings in an intermediate portion and in peripheral portions of a picture formed on the phosphor screen so that the change of inductance of the saturated coils in the vertical axis direction compensates the difference of EW distortion between the intermediate portion and the peripheral portions of the picture with respect to the horizontal axis direction.
3 more elements
A cathode-ray tube apparatus comprising:
- a vacuum envelope including a substantially rectangular panel having a phosphor screen on the inner surface thereof and also having a horizontal and a vertical axis, a funnel fixed to the panel and a neck connected to a reduced-diameter portion of the funnel;
- an electron gun arranged in the neck, for emitting electron beams towards the phosphor screen;
- a deflecting yoke mounted on the reduced-diameter portion of the funnel and on the circumference of the neck, for deflecting the electron beams so that the phosphor screen is scanned in the horizontal and vertical directions, the deflecting yoke having horizontal deflecting coils for deflecting the electron beams in the horizontal direction, and vertical deflecting coils for deflecting the electron beams in the vertical direction;
- and
- a distortion compensating element having horizontal auxiliary coils connected to the horizontal deflecting coils, vertical auxiliary coils connected to the vertical deflecting coils, saturable cores around which the horizontal or vertical auxiliary coils are wound, and magnets biasing the saturable cores magnetically,
- wherein the distortion compensating element has different settings in an intermediate portion and in peripheral portions of a picture formed on the phosphor screen so that the change of inductance of the horizontal auxiliary coils in the horizontal axis direction compensates the difference of NS distortion between the intermediate portion and the peripheral portions of the picture with respect to the vertical axis direction.
3 more elements
A cathode-ray tube apparatus comprising:
- a vacuum envelope including a substantially rectangular panel having a phosphor screen on the inner surface thereof and also having a horizontal and a vertical axis, a funnel fixed to the panel and a neck connected to a reduced-diameter portion of the funnel;
- an electron gun arranged in the neck, for emitting electron beams towards the phosphor screen;
- a deflecting yoke mounted on the reduced-diameter portion of the funnel and on the circumference of the neck, for deflecting the electron beams so that the phosphor screen is scanned in the horizontal and vertical directions, the deflecting yoke having horizontal deflecting coils for deflecting the electron beams in the horizontal direction, and vertical deflecting coils for deflecting the electron beams in the vertical direction;
- and
- a distortion compensating element having horizontal auxiliary coils connected to the horizontal deflecting coils, vertical auxiliary coils connected to the vertical deflecting coils, saturable cores around which the horizontal or vertical auxiliary coils are wound, and magnets biasing the saturable cores magnetically,
- wherein the distortion compensating element has different settings in an intermediate portion and in peripheral portions of a picture formed on the phosphor screen so that the change of inductance of the vertical auxiliary coils in the vertical axis direction compensates the difference of East-West distortion between the intermediate portion and the peripheral portions of the picture with respect to the horizontal axis direction.
3 more elements
Dependencies are inferred from the claim text.