High-definition cathode ray tube and electron gun with lower power consumption
AssigneeAltera Corporation
InventorsThomas A. Skupien, Byron G. Zollars
Life of this patent
Estimating the term…
Abstract
A high-definition CRT is provided having an electron gun to produce high beam current without increasing spot size and to provide lower electrical power requirements at high beam-modulation frequencies. The electron gun includes three electrodes having clusters of apertures to allow collimation of the electron beam from a cathode. The main lens is operated to focus a parallel beam of electrons on a display screen. Methods for manufacturing by mechanical or semiconductor methods are also provided.
Claims23
A method for manufacturing an electron gun, comprising:
- providing a single support bracket, the single support bracket having a clear aperture and a plurality of alignment holes, the alignment holes configured to fit a plurality of first alignment rods, and a plurality of anchor tabs configured to fit a plurality of second alignment rods;
- providing a monolithic structure that includes a plurality of beam-forming electrodes to form at least one beam, the monolithic structure having a plurality of aperture clusters for each beam and a plurality of alignment holes configured to fit the plurality of first alignment rods, the alignment holes disposed outside the aperture clusters;
- enclosing the monolithic structure within a recessed region of the single support bracket such that a first beam-forming electrode from the plurality of beam-forming electrodes is in contact with the single support bracket to establish an electrical connection to the first beam-forming electrode through a tab extending from the single support bracket;
- aligning one of a cathode or a cathode holder with the single support bracket, the monolithic structure, and a main lens by assembling on the first alignment rods;
- and
- affixing the plurality of second alignment rods to the plurality of anchor tabs to form the electron gun.
A method for manufacturing a beam-forming assembly for an electron gun, comprising:
- forming a first beam-forming electrode with a first doped layer of a semiconductor;
- forming a first insulating layer on a surface of the first beam-forming electrode;
- forming a second beam-forming electrode with a second doped layer of a semiconductor on the first insulating layer;
- forming a second insulating layer on a surface of the second doped layer;
- forming a third beam-forming electrode with a third doped layer of a semiconductor on the second insulating layer to obtain a monolithic structure;
- and
- enclosing the monolithic structure within a recessed region of a single support bracket, the enclosing including contacting a region of an opposing surface to the surface of the first beam-forming electrode with the single support bracket to establish an electrical connection to the first beam-forming electrode.
Dependencies are inferred from the claim text.