1 July 1964 Image Converter Shutters
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An image converter tube contains a photoemissive surface which emits electrons from each small area in proportion to the intensity of light striking it. The electrons are pulled away from the surface, or photocathode, by an electric field and accelerate through a vacuum to a fluorescent screen. An electron lens may be used to bring together all of the electrons emitted from any point on the photocathode to a corresponding point on the screen, creating an electron image of the light intensity pattern on the photocathode. The phosphor converts the electron energy to light, recreating the original optical image.
George L. Clark, "Image Converter Shutters," Optical Engineering 2(5), 205178 (1 July 1964). https://doi.org/10.1117/12.7971279 . Submission:

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