Electric lamp and discharge devices – Cathode ray tube – Secondary emissive electrode
Patent
1987-08-27
1988-12-20
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Secondary emissive electrode
313400, 313103CM, 313105R, 313105CM, H01J 3148, H01J 4304
Patent
active
047927186
ABSTRACT:
In a display tube a laminated dynode channel plate electron multiplier (16) produces at its channel outputs (50) a current-multiplied beam (34) in response to an electron beam being scanned thereover which is accelerated towards a phosphor screen (14) comprising repeating groups of different color phosphor elements and selectively directed onto particular elements by color selection deflector electrodes (38,40) adjacent the channel outputs. To provide increased horizontal resolution capability the exits (50) of the apertures in the final dynode are elongate in shape, other dynodes having circular apertures, and arranged parallel to one another with their longer axes extending vertically to form a comparatively narrow horizontal width output beam. The final dynode aperture entrances may be similarly elongate or circular with the apertures having a re-entrant profile. An apertured extractor electrode (36) disposed between the multiplier and color selection electrodes may also have elongated apertures (42) to enhance this beam shaping.
REFERENCES:
patent: 3235765 (1966-02-01), Goodrich et al.
patent: 3564323 (1971-02-01), Maeda
patent: 3612946 (1971-10-01), Toyoda
patent: 3849692 (1974-11-01), Beasley et al.
patent: 4041343 (1977-08-01), Orthuber
patent: 4071474 (1978-01-01), Kishimoto
patent: 4560898 (1985-12-01), Knapp et al.
Horabik Michael
Kraus Robert J.
Moore David K.
U.S. Philips Corporation
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