Browse Prior Art Database

Electro Optical Readout of Information Recorded on Dielectrical Material

IP.com Disclosure Number: IPCOM000094589D
Original Publication Date: 1965-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Supernowicz, EJ: AUTHOR

Abstract

The diagram represents a method of producing an optical image from a latent electrostatic image recorded or stored on the surface of dielectric material 10.

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Electro Optical Readout of Information Recorded on Dielectrical Material

The diagram represents a method of producing an optical image from a latent electrostatic image recorded or stored on the surface of dielectric material
10.

An electro-optical effect, similar to the Kerr or Faraday effect, is utilized in which a plane polarized beam of light becomes elliptically polarized by the action of an electrostatic field. A mode of reading the data comprises placing a glass strip 11 having a smooth, specular coating 12 against the dielectric 10 so that the specular coating contacts the electrostatic image. A beam of light 15 is plane polarized by polarizer 16. The beam is focused through the glass and on the specular coating so that the light reflected from charged areas is elliptically polarized and light reflected from uncharged areas is unchanged. The resultant polarization pattern corresponds to the latent image.

By examining the image with analyzer 17 and microscope 18, the difference in polarization makes the image visible. The image can also be projected on a screen, or a raster scan of a small beam of light can be reflected to a photomultiplier tube for serial transmission to a remote display station.

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