Flat cathode ray tube

Details Flat cathode ray tube Flat cathode ray tube

1981-03-06

1983-07-19

LaRoche, Eugene R.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313423, 313426, H01J 2946

Patent

active

043945996

ABSTRACT:
A flat cathode ray tube comprises in an envelope (10) an electron gun (16) for generating a low energy electron beam (14) which undergoes electrostatic frame deflection by means of a pair of electrodes (22, 24). The electron beam (14) then has its energy increased by means of a double electron lens (30). The double electron lens (30) comprises a first electron lens (32) the image of which forms the object for a second electron lens (36) which provides an electron spot of acceptable size on the screen (12). Thereafter the beam undergoes line deflection in an electrostatic line deflector (40). The line deflector (40) varies the angle of entry of the electron beam into a uniform electric field formed between the screen (12) and a repeller electrode (44) where electron beam follows a parabolic trajectory to the screen (12).

REFERENCES:
patent: 2850669 (1958-09-01), Geer
patent: 2926255 (1960-02-01), Gabor et al.
patent: 2999957 (1961-09-01), Schagen et al.
patent: 3990038 (1976-11-01), Jensen et al.

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