Optical apparatus for selectively producing rippled message images in areas of specular surfaced photoplastic film and erasing such images from such areas for reuse
US3992090A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1975 |
| Grant date | Nov 16, 1976 |
| Priority date | — |
| Expiry date | Feb 27, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G16/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Camera and imaging processing apparatus for producing rippled message images in frame areas of specular surfaced photoplastic film having a conductive substrate below an upper heat-softenable and image rippleable emulsion layer. Images are formed by image patterned electrostatic charge and heat deformation, and are erased at higher temperatures for re-recording. A film support includes a lateral platen having an opening to permit contact of the back of the film with a moveable heatable metallic block to effect conduction heat softening. The conductive substrate of the film is held at ground potential, and a charging apparatus interposed between the film and an objective lens, through which the image to be recorded is projected, imposes a large electrostatic charge differential on the platen to cause the film to be snugged to the platen. The charging apparatus includes a housing which defines an optical aperture. A shutter mechanism is provided between the objective lens and the charging apparatus to control irradiation of the film by the image beam. PAC SUMMARY The present invention relates to apparatus for handling, and more particularly processing, photoplastic film which has a s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.