Color cathode-ray tube and method for manufacturing the same
AssigneeKabushiki Kaisha Toshiba
InventorsTakashi Nishimura, Toru Takahashi
Life of this patent
Estimating the term…
Abstract
A shadow mask is arranged in an envelope and opposes a phosphor screen formed on an inner surface of a face plate. The shadow mask includes a plurality of mask pieces arranged in series. Each of the mask pieces has effective portions in which a number of electron beam passage apertures are formed. A plurality of mask frames supporting the respective mask pieces are fixed to the inner surface of the face plate. A plurality of stages are provided on the inner surface of the face plate. Each of the stages has a first end in contact with the inner surface of the face plate and a second end in contact with one of the mask piece, so as to define a distance between each of the mask pieces and the phosphor screen and to apply a tensile force to the mask piece.
Claims15
A color cathode-ray tube comprising:
- an envelope including a substantially rectangular face plate having first and second axes perpendicular to each other, and a rear plate opposing the face plate;
- a phosphor screen formed on an inner surface of the face plate;
- a shadow mask arranged in the envelope and opposing the phosphor screen, the shadow mask including a plurality of mask pieces arranged in series along the first axis, each of the mask pieces extending along the second axis and having an effective portion in which a number of electron beam passage apertures are formed;
- a plurality of mask frames supporting the respective mask pieces at both ends thereof as viewed in a direction of the second axis;
- a plurality of stages provided on the face plate, each defining a distance between one mask piece and the phosphor screen, each of the stages having a first end in contact with the inner surface of the face plate and a second end in contact with one of the mask frames or an end of the mask piece, as viewed in the direction of the second axis;
- and
- beam emitting means mounted on the rear plate, for emitting electron beams to the phosphor screen through the effective portions of the mask pieces so as to dividedly scan a plurality of regions of the phosphor screen.
A color cathode-ray tube comprising:
- an envelope including a substantially rectangular face plate having first and second axes perpendicular to each other, and a rear plate opposing the face plate;
- a phosphor screen formed on an inner surface of the face plate;
- a plurality of positioning marks formed on the inner surface of the face plate on both end sides of the phosphor screen in a direction of the second axis and arranged at predetermined positions with respect to the phosphor screen;
- a shadow mask arranged in the envelope and opposing the phosphor screen, the shadow mask including a plurality of mask pieces arranged in series along the first axis, each of the mask pieces extending along the second axis and including an effective portion having a number of electron beam passage apertures, and positioning holes formed at predetermined positions on both end portions along the second axis of the mask piece, each of the mask pieces being arranged while the positioning holes being respectively aligned with the corresponding positioning marks;
- a plurality of mask frames supporting the respective mask pieces at both ends thereof as viewed in a direction of the second axis;
- a plurality of stages provided on the face plate, each defining a distance between one mask piece and the phosphor screen, each of the stages having a first end in contact with the inner surface of the face plate and a second end in contact with one of the mask frames or an end of the mask piece, as viewed in the direction of the second axis;
- and
- beam emitting means mounted on the rear plate, for emitting electron beams to the phosphor screen through the effective portions of the mask pieces so as to dividedly scan a plurality of regions of the phosphor screen.
Dependencies are inferred from the claim text.