Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1985-08-27
1987-03-10
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313417, 313451, 313457, H01J 2950, H01J 2982
Patent
active
046493174
ABSTRACT:
An electron gun for a cathode-ray tube comprises a modular beam-forming region assembly and a main focusing lens which are affixed to at least two insulative support rods. The modular beam-forming region assembly includes a plurality of cathode assemblies, a control grid electrode and a screen grid electrode. The control grid electrode and the screen grid electrode are attached to a first major surface, of a common ceramic member and the cathode assemblies are attached to a second major surface thereof. A transition member is disposed between a metallized pattern on the first major surface of the ceramic member and the screen grid electrode. The transition member includes a substantially flat portion attached to the metallized pattern and two upright portions substantially perpendicular to the flat portion and substantially parallel to each other. The screen grid electrode is disposed between the upright portions and connected thereto by a plurality of step-like support members. Each of the step-like support members includes a screen grid electrode contact portion, a bead support contact portion and a central riser portion extending between the contact portions. The screen grid electrode contact portion of each step-like support member is attached to the screen grid electrode. The bead support contact portion of each step-like support member is attached to a different one of a plurality of bead support members affixed to the insulative support rods, whereby the screen grid electrode is longitudinally spaced from the main focusing lens.
REFERENCES:
patent: 4298818 (1981-11-01), McCandless
patent: 4500808 (1985-02-01), McCandless
patent: 4520292 (1985-05-01), van Hekken et al.
patent: 4558254 (1985-12-01), Opresko
U.S. Patent Application Ser. No. 643,175, entitled, "Multibeam Electron Gun Having a Cathode-Grid Subassembly and Method of Assembling Same", filed on Aug. 22, 1984, by McCandless et al.
U.S. Patent Application Ser. No. 643,314, entitled, "Structure for and Method of Aligning Beam-Defining Apertures by Means of Alignment Apertures", filed on Aug. 22, 1984, by S. T. villanyi.
U.S. Patent Application Ser. No. 735,261, entitled, "Multibeam Electron Gun Having a Transition Member and Method for Assembling the Electron Gun", filed on May 17, 1985, by H. E. McCandless.
Coughlin Jr. Vincent J.
DeMeo Palmer C.
Irlbeck Dennis H.
RCA Corporation
Whitacre Eugene M.
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