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US 7,157,844 B2Granted
Cathode ray tube provided with a faceplate having a convex outer surface and a lens assembly attached therein
AssigneeHitachi Displays, Ltd.
InventorsTetsuo Asano, Kenji Kato
Life of this patent
Estimating the term…
Abstract
In a projection cathode ray tube device in which a projection cathode ray tube and a projection lens assembly are coupled and held by a coupler, superior focus characteristics and high resolution are realized by eliminating the deviation between the center of the phosphor screen of the cathode ray tube and the center of the lens assembly. In the cathode ray tube, each of the outside and inside surfaces of a faceplate is formed as a spherical convex surface which is curved toward an electron gun.
Claims9
A cathode ray tube device comprising:
- a cathode ray tube including a panel portion having an image-displaying phosphor screen on an inside surface of a faceplate, a neck portion containing an electron gun to emit an electron beam toward the phosphor screen, a funnel portion connecting the panel portion and the neck portion, and a stem portion closing an open end of the neck portion;
- a deflector containing a deflection yoke fitted on the cathode ray tube;
- a lens assembly disposed on the side of an outside surface of the faceplate;
- a coupler disposed between the lens assembly and the cathode ray tube to couple both of them to each other, and provided with a flange portion facing the outside surface of the faceplate;
- and
- a refrigerant liquid disposed in a space surrounded by the lens assembly, the coupler and the outside surface of the faceplate,
- wherein approximately the whole region of each of the inside and outside surfaces of the faceplate is a convex surface curved toward the electron gun and an outside-surface curvature of the faceplate is smaller than an inside-surface curvature of the faceplate,
- the flange portion of the coupler having a convex surface curved toward the electron gun.
5 more elements
A cathode ray tube device comprising:
- a cathode ray tube including a panel portion having an image-displaying phosphor screen on an inside surface of a faceplate, a neck portion containing an electron gun to emit an electron beam toward the phosphor screen, a funnel portion connecting the panel portion and the neck portion, and a stem portion closing an open end of the neck portion;
- a lens assembly disposed on the side of an outside surface of the faceplate;
- and
- a coupler disposed between the lens assembly and the faceplate of the cathode ray tube,
- wherein the outside surface of the faceplate is a convex surface curved toward the electron gun, the coupler provided with a flange portion facing the outside surface of the faceplate, the flange portion of the coupler having a convex surface curved toward the electron gun, the convex surface of the flange portion is inclined along the opposite outside surface of the faceplate, and the coupler is fixed by being pressed against the faceplate.
2 more elements
Dependencies are inferred from the claim text.