Kabushiki Kaisha Toshiba

Yuuichi Sano

Masahiro Yokota

Eiji Kamohara

Tadahiro Kojima

Hiroaki Ibuki

Hideo Mori

Kouichi Soneda

Cathode-ray tube device comprising a deflection yoke with a non-circular core having specified dimensional relationships

An electron gun which emits three electron beams consisting of a center beam and paired side beams arranged in line in the horizontal axis is arranged in the neck of the vacuum envelope. A neck-side orbital correction coil unit for over-converging the side beams running toward the peripheral portion of a phosphor screen and a panel-side orbital correction coil unit for under-converging the side beams running toward the peripheral portion of the phosphor screen are provided between the cathode of the electron gun and the phosphor screen. The panel-side orbital correction coil unit has four orbital correction coils provided inside the magnetic core of a deflection yoke. Each orbital correction coil includes paired coil wires extending in the tube axis direction. One of the coil wires is positioned at an angle of 10 to 30&deg; to the vertical axis, and the current flows from the neck side toward the panel through this coil wire. The other coil wires are positioned at an angle of 60 to 90&deg; to the vertical axis, and the current flows from the panel side toward the neck through this coil.

Cathode ray tube having multiple sets of orbital correction coils

Cathode-ray tube having a non-circular yoke section

A color cathode-ray tube having at least one trajectory correction device including a plurality of trajectory correction coils, and a current supply circuit for supplying current to these coils. The trajectory correction device functions to over-converge or under-converge a pair of side beams at a peripheral portion of the phosphor screen relative to a center of the phosphor screen. The trajectory correction device produces a magnetic field such that there is a position in the produced magnetic field where no force is exerted on the three electron beams. This position is separated from a plane including a tube axis, and a first direction or a second direction. In this color cathode-ray tube apparatus with this structure, no degradation occurs in focusing or distortion characteristics even where the trajectory correction device is provided, for example, in realizing a flat screen by using a press-formed shadow mask.

Color cathode-ray tube apparatus

Cathode ray tube with deflection yoke including non-circular separator

A vacuum envelope of a cathode ray tube includes a rectangular panel having an inner surface where a substantially rectangular phosphor screen is formed, a neck in which an electron gun is provided, and a funnel connected between the panel and the neck. The funnel has a first portion having a large diameter and positioned on the phosphor screen side, and a substantially truncated quadrangular pyramid-like second portion positioned on the neck side. From the second portion to the neck, a deflection yoke is mounted on the outer surface of the funnel. Where the vacuum envelope is cut along a plane including a tube axis, the shapes of the cross-sections of the first and second portions have an inflection point at the boundary between the first and second portions. The end of the deflection yoke on the phosphor screen side is positioned near the inflection point.

Cathode ray tube with contoured envelope

A funnel (32) of an envelope of a cathode ray tube has a cone portion (40) and a deflection yoke (37) is mounted on the cone portion (40). The deflection yoke (37) includes a hollow magnetic core (44), and horizontal deflection coils (43H) and vertical deflection coils (43V) which are provided on an inner surface side of the core (44). Each of lateral cross-sections of an outer surface of the cone portion (40) and an inner surface of the core (44), perpendicular to a center axis of the funnel (32), has a substantially rectangular shape, and a gap between the lateral cross-sections of the outer surface of the cone portion (40) and the inner surface of the core (44) includes a non-uniform portion.

CRT with non-circular cone and yoke

A cathode ray tube includes a vacuum envelope having a substantially rectangular panel, a cylindrical neck, and a funnel connecting the panel and the neck. A phosphor screen arranged on the inner surface of the panel generates luminescence upon impingement of electron beams, which are generated by an electron gun assembly disposed in the neck. In order to create a image visible through the panel, a deflection yoke is mounted on the outer surface of the funnel to generate a magnetic field in the funnel, deflect the electron beams, and thereby scan the phosphor screen. According to the present invention, the portion of the funnel over which the deflection yoke is mounted is formed such that the power required to generate a deflection field capable of scanning substantially the entire phosphor screen may be reduced. To this end, the funnel is formed over a predetermined range along a first axis coincident with the axis of symmetry of the cylindrical neck such that at least one cross section of the inner and outer funnel perpendicular to the first axis has a non-circular shape and a maximum diameter along a direction other than those of the major and minor axes of the substantially rectangular panel. Moreover, within this predetermined range, the point on the funnel's cross section that is furthest from the first axis is not located along the direction of the panel's diagonal axis.

Cathode ray tube having an envelope shaped to reduce beam deflection

A cathode ray tube apparatus having a vacuum enclosure defined by a neck extending into a yoke portion and further extending into a panel including a screen, wherein a deflection yoke is fixed on the outer surface of the yoke portion which is formed between the screen and the neck of a vacuum enclosure. According to the invention, if the cross-sectional configuration of the yoke portion perpendicular to the tube axis at a reference deflection position is non-circular, e.g., barrel-like or rectangle-like, the aspect ratio of scanning of the screen is M:N, lengths LA, SA and DA are defined between a tube axis and intersection points of horizontal, vertical and diagonal axes and the outer periphery of the yoke portion at the reference deflection position, the following equation is established:

Cathode ray tube apparatus

A funnel of a cathode ray tube includes a yoke attachment portion on which a deflection yoke is mounted so as to deflect the electron beam emitted from an electron gun along horizontal and vertical axis. At least one cross section of the yoke attachment portion, perpendicular to the tube axis, has an inner contour which is substantially rectangular with four sides. The sides are defined by convexities curved toward the tube axis and each having a peak on the horizontal or vertical axis. The inner contour of the cross section faces the electron beam passage region with a substantially constant gap.

Cathode ray tube

This cathode ray tube includes a vacuum envelope having a substantially rectangular panel, a funnel formed contiguous to the panel, and a cylindrical neck formed contiguous to the small-diameter end portion of the funnel, an electron gun assembly disposed in the neck to generate electron beams, and a deflection yoke mounted on the outer side of the funnel near the neck side over a predetermined range to form a magnetic field in the funnel, thereby deflecting the electron beams along the major and minor axes of the panel. Of the predetermined range of the funnel, at the neck side, the funnel is formed to have an outer shape with a section which is gradually deformed, from the neck side to the panel side, from a circular shape to a non-circular shape having a maximum diameter along a direction other than the major and minor axes. The funnel of the predetermined range is formed to have an outer shape with a section that satisfies a relation:

Growing community of inventors

Fukaya, Japan

Yuuichi Sano