Nondestructive readout of a latent electrostatic image formed on

Details Nondestructive readout of a latent electrostatic image formed on Nondestructive readout of a latent electrostatic image formed on

1985-04-03

1987-05-05

Howell, Janice A.

Radiant energy

Source with charged plate-type detector

2503272, 250370, G01T 124, H01L 3100

Patent

active

046635262

ABSTRACT:
A method and apparatus are described for the nondestructive readout of a latent electrostatic image formed on a sheet or layer of insulating material. A sheet or layer of semiconductor material is disposed in relatively close proximity to the insulating material. The latent electrostatic image formed on the insulating material causes a surface depletion layer to by produced by induction at the surface of the semiconductor material. The location and distribution of the accumulated charges on the semiconductor material are read out as analog electrical signals corresponding to the ac surface photovoltage induced on the semiconductor material as the semiconductor material is scanned with a low intensity modulated light beam of appropriate wavelength, the magnitude of the analog signals depending on the local charge density. The analog electrical signals so obtained are then digitized, processed and stored and/or displayed.

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patent: 4404422 (1983-09-01), Green et al.
patent: 4508966 (1985-04-01), Oberschmid et al.

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