The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 1977
Filed:
Dec. 08, 1975
Roger Wayne Honebrink, St. Paul, MN (US);
Leslie Harold Johnson, St. Paul, MN (US);
David Shih-Fang Lo, St. Paul, MN (US);
Sperry Rand Corporation, New York, NY (US);
Abstract
An apparatus for and a method of recording or writing optical data into a thermoplastic layer is disclosed. The apparatus includes a layer of photoconductive material that is photoconductively responsive to a data containing light beam having a wave length below the infrared (IR) range and a layer of thermoplastic material that is thermoplastically responsive to a light beam having a wave length within the IR range. In practicing the method of the present invention, the electrically charged apparatus is exposed to a data-bearing light beam having a wave length below the IR range for selectively exposing, i.e., electrically charging, the photoconductive layer. Next, the apparatus is exposed to a light beam having a wave length within the IR range for heating the thermoplastic film and thermally permitting the selective electric charge in the photoconductive layer to distort the surface of the thermoplastic layer, and, accordingly, writing into the thermoplastic layer the optical data that was contained within the data-bearing light beam.