Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1996-07-02
1998-06-16
Patel, Ashok
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 313456, 313459, H01J 2948, H01J 2970
Patent
active
057676143
ABSTRACT:
A cathode ray tube includes a panel having a fluorescent screen formed on an inner surface thereof, a stem, and a neck between the panel and the stem. An electron gun is supported by a supporting structure in coaxial alignment with the neck. The electron gun has a focusing electrode which includes a first cylinder and a second cylinder having a larger diameter than the first diameter. The first cylinder has a first opening which opens toward the stem and the second cylinder has a second opening which opens toward the panel. A conductive layer is deposited on the inner surface of the cathode ray tube and receives a high voltage. An annular holder is mounted to the supporting structure so that the annular holder surrounds the first cylinder in coaxial alignment with the focusing electrode. The annular holder is a first predetermined radial distance away from the first cylinder and a second predetermined axial distance from second cylinders. A plurality of springs are mounted on the outer circumferential surface of the annular holder. The springs extend to electrically contact the conductive layer and hold the annular holder so that the annular holder is in coaxial alignment with the longitudinal axis of the cathode ray tube.
REFERENCES:
patent: 3950667 (1976-04-01), DeJong et al.
patent: 4728846 (1988-03-01), Yasuda
patent: 4801843 (1989-01-01), Mensies
patent: 4855639 (1989-08-01), Van Eck
patent: 4904898 (1990-02-01), Penird et al.
patent: 5412277 (1995-05-01), Chen
patent: 5610475 (1997-03-01), Chen
Mitsubishi Denki & Kabushiki Kaisha
Patel Ashok
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