Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1977-10-04
1980-03-11
Segal, Robert
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313451, 313412, 313481, H01J 196
Patent
active
041930169
ABSTRACT:
This disclosure depicts for use in a television picture tube having a bulb with a neck at the rear end thereof, a novel electron gun located in closely confined relationship in the neck. The gun has at least one cathode having an electron emissive coating, an apertured, substantially diamond-shaped shield cup with truncated corners and a plurality of electrodes interspaced between the cathode and the shield cup. The tube is characterized by the shield cup having one or more inward formations at one or more spaced locations around its periphery. The inward formations of the shield cup function to define one or more openings between the shield cup and the inner wall of the neck which act as cathode-erosion-suppressing by-pass vents during tube evacuation, and/or provide augmented deflection space for contact springs attached to selected opposite ones of said corners.
REFERENCES:
patent: 3524096 (1970-08-01), Kuryla et al.
patent: 3573533 (1971-04-01), Gronlund
patent: 3931540 (1976-01-01), Kawamura
patent: 3961220 (1976-06-01), Say
patent: 3987328 (1976-10-01), Yoshida et al.
Clarke, Jr. Ralph E.
Hostetter Darwin R.
Segal Robert
Zenith Radio Corporation
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