Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1982-10-28
1985-09-10
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural concentrating, accelerating, and/or de-accelerating...
313449, H01J 2946, H01J 2956
Patent
active
045409161
ABSTRACT:
An electron gun for a television camera tube comprises a cathode for emission of electrons, a first grid disposed subsequently to the cathode and having a first aperture supplied with a positive voltage relative to the cathode, a second grid disposed subsequently to the first grid and having a second aperture supplied with a higher positive voltage than that supplied to the first grid, and an intermediate grid interposed between the first and second grids and having a hole. The intermediate grid forms a divergent electron lens near the first aperture between the first and second grids. An electron beam having passed through the first aperture is once diverged by the divergent electron lens to form a crossover at an axial position of the gun which is remote from the first grid and at which the potential on the beam axis is high, whereby broadening of the width of the velocity distribution of extracted electrons can be suppressed to a minimum and the amount of beam current passing through the second aperture can be increased.
REFERENCES:
patent: 3417199 (1968-12-01), Yoshida et al.
patent: 3873878 (1975-03-01), Odenthal
patent: 3924153 (1975-12-01), McIntyre
patent: 3928784 (1975-12-01), Weijland
patent: 3995194 (1976-11-01), Blacker, Jr. et al.
patent: 4388556 (1983-06-01), Rao
Fukushima Masakazu
Kato Shin-ichi
Maruyama Masanori
Ogusu Chihaya
Blum Theodore M.
Hitachi , Ltd.
Nippon Hoso Kyokai
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