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:
Nov. 30, 1976
Filed:
Jan. 02, 1975
David S Lo, Burnsville, MN (US);
Leslie H Johnson, St. Paul, MN (US);
Roger W Honebrink, Chaska, MN (US);
Sperry Rand Corporation, New York, NY (US);
Abstract
A method of and an apparatus for achieving consistent recording or writing of optical data in thermoplastic films is disclosed. An empirically determined level of developing energy E is set into a heat controller that applies developing energy E (heat) to the thermoplastic film that had been previously subjected to an electrostatic charge and an optical signal (light). The monitored frost intensity F.sub.m is then compared to an empirically determined desired frost intensity F.sub.d. If F.sub.m .noteq. F.sub.d the developing energy E that is to be applied to the thermoplastic film is adjusted accordingly in preparation for the next writing operation. Control of the writing process is through control of the developing energy E that is applied to the thermoplastic film with all other developing parameters held relatively constant.