Digitally encoded alpha-numeric projector slide and systems for using the same
US4765734A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 1986 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | May 22, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B23/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention includes an information projector slide comprising a planar member having a central window for holding a photographic film image and at least one border adjacent the window. A magnetic medium for storing selected digitally encoded alpha-numeric information is affixed to the border. A read/write system for reading information from and writing information to the projector slide includes a read head, a write head, a controller, a keyboard and a display monitor. An optical projection system and a video projection system are provided for concurrently displaying an image from a photographic slide and encoded information from the magnetic media. A cropping system is also provided for use with the video projection system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.