Method and apparatus for displaying and reading out an image
AssigneeNorth American Philips Corporation
InventorsEmil Arnold, Barry M. Singer
Life of this patent
Estimating the term…
Abstract
An apparatus and technique are described for storing a latent radiation image on a photoconductor by way of charge produced on the photoconductor and absorption of light from an object transmitted onto the photoconductor. Read out is provided by scanning a light source over the photoconductor to create a photocurrent which activates a CRT read out device or is stored in an image recording system.
Claims16
In an improved apparatus for displaying and reading out an image comprising a film of photoconductor material, first means for depositing electrical charge over said film to establish a voltage across said film, an object adjacent said film, a radiation source directing radiation through said object to said film, said photoconductive film producing local voltages over a surface of said film in response to absorption of said radiation passing through said object, wherein changes of said local voltages at said surface of said film constitute a latent radiation image, second means for scanning light over said surface to create a photocurrent dependent on said latent radiation image, third means for measuring said photocurrent, said photocurrent having a magnitude dependent upon said local voltages, and fourth means for reading out said image corresponding to said photocurrent,
- wherein the improvement comprises said first means being a corona discharge device, and
- said second means producing light having wavelengths shorter than the bandgap of said photoconductive material.
In an improved method for displaying and reading out an image comprising the steps of depositing electrical charge over a film of photoconductor material to establish a voltage across said film, directing radiation through an object onto said film, producing local voltages over a surface of said film in response to absorption of said radiation by said object, said local voltages constituting a latent radiation beam, scanning light over said surface to create a photocurrent, measuring said photocurrent, and reading out said image,
- wherein the improvement comprises carrying out said step of depositing electrical charges by a corona discharge, and
- said step of scanning light by producing light having wavelengths shorter than the bandgap of said photoconductor material.
Dependencies are inferred from the claim text.