Sound-slide projector control apparatus
US4041457A · kind A · utility
9Cited by
5References
6Claims
0Family size
Inventor
Key dates
| Filing date | Mar 16, 1976 |
| Grant date | Aug 9, 1977 |
| Priority date | — |
| Expiry date | Mar 16, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B23/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A sound-slide projector of a basic form illustrated in U.S. Pat. No. 3,732,000 is equipped with a keyboard which controls a digital servomotor to position a slide tray for random access to the sound-slides. Operation of a mechanical slide-changing mechanism formerly cyclically operated in a predetermined time by a flywheel is temporarily interrupted by a solenoid while the servomotor positions the slide tray to provide variable timing required for random selection of sound slides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.