Image converter having cylindrical housing and photocathode sepa

Details Image converter having cylindrical housing and photocathode sepa Image converter having cylindrical housing and photocathode sepa

1978-12-06

1981-10-06

Segal, Robert

Electric lamp and discharge devices

Secondary emission prevention

Nonemissive material

313102, 313 95, H01J 4002, H01J 4018

Patent

active

042937906

ABSTRACT:
An image converter is disclosed which can be operated by means of a relatively low voltage D.C. supply. In this invention, the luminescent screen of the image converter is brought closer to the photocathode by forming the exit window with a frustrum-shaped platform with a top surface that is parallel to the entrance window, and upon which top surface the luminescent screen is mounted. As a result of the closer spacing between the photocathode and the luminescent screen, lower D.C. supply voltages can be utilized. Moreover, the shape of the housing which supports the two windows at the image converter is so designed that the interior surface of the housing is non-perpendicular to the equipotential lines of the electric field which is established between the photocathode and the luminescent screen. As a result of this geometrical relationship, avalanche discharge is reduced or eliminated altogether, thereby reducing or eliminating the undesirable arcing which can occur as a result of such avalanche discharge. Embodiments are taught for amplification of projected images in the visible portion of the electromagnetic spectrum, along with embodiments which can be utilized to form images of radioactive radiation, X-ray radiation and ultraviolet radiation.

REFERENCES:
patent: 2197625 (1940-04-01), Teves et al.
patent: 2871368 (1959-01-01), Bain
patent: 2879424 (1959-03-01), Garbuny et al.
patent: 3304455 (1967-02-01), Mesta
patent: 3375391 (1968-03-01), Day
patent: 3392297 (1968-07-01), Schwartz
patent: 3772551 (1973-11-01), Grant
patent: 3951698 (1976-04-01), Wilson et al.

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