Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1981-10-02
1984-08-21
Evans, F. L.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313529, H01J 3150
Patent
active
044671890
ABSTRACT:
A framing tube includes a cylindrical airtight vacuum tube, a shutter plate, and a ramp generator. The container has a photocathode at one end thereof and a fluorescent screen at the other end thereof which is opposite to the photocathode. The shutter plate is disposed between and parallel to the surface of the photocathode and fluorescent screen and has a multiplicity of through holes perforated perpendicular to its surface. The shutter plate also carries at least three electrodes that are disposed perpendicular to the axis of the through holes and spaced parallel to each other. The electrodes divide the surface of the shutter plate into a plurality of sections. The ramp generator is connected to the electrodes. The ramp voltage generated changes in such a manner as to reverse its polarity, producing a time lag between the individual electrode. Developing an electric field across the axis of the through holes in the shutter screen, the ramp voltage controls the passage of the electron beams from the photocathode through the through holes. A framing camera includes the above-described framing tube and an optical system. The optical system includes a semitransparent mirror that breaks up the light from the object under observation into a plurality of light components and a focussing lens disposed in the path through which each of the light components travels. Each of the light components corresponds to each of the sections on the shutter plate. The images of a rapdily changing object are reproduced, at extremely short time intervals, on different parts of the fluorescent screen.
REFERENCES:
patent: 4243878 (1981-01-01), Kalibjian
patent: 4350919 (1982-09-01), Johnson et al.
Evans F. L.
Hamamatsu Photonics Kabushiki Kaisha
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