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:
Jun. 02, 1987
Filed:
Aug. 07, 1985
Applicant:
Inventor:
Peter W Ross, Stansted, GB;
Assignee:
Standard Telephone and Cables Public Limited Company, London, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; H04N / ;
U.S. Cl.
CPC ...
250331 ; 350-11 ; 350351 ; 358113 ;
Abstract
A thermal image is created in a thermostatically controlled liquid crystal cell (4) containing a two-frequency nematic or cholesteric (3). This is addressed with an alternating potential whose frequency can be swept through the cross-over frequency. By appropriate choice of frequency within this range the thermal image is converted to a phase image which in its turn is converted to a contrast image in conventional manner.