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US 4,394,599 AGranted
Flat cathode ray tube
AssigneeU.S. Philips Corporation
InventorsJames Smith, Daphne L. Lamport
Life of this patent
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AssigneeU.S. Philips Corporation
InventorsJames Smith, Daphne L. Lamport
Estimating the term…
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).
A flat cathode ray tube including an electron gun for producing an electron beam, first means for deflecting the beam in a first direction, means for accelerating the deflected beam, second means for deflecting the accelerated beam in a second direction, and a pair of spaced-apart electrodes defining a trajectory control space into which the beam is directed by the second means, said electrodes including a screen and a repeller electrode for repelling the beam toward the screen,
Dependencies are inferred from the claim text.