Method of monitoring thermoplastic recording
US3995280A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Jan 2, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C27/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.