Slide projector for wall projection and groundglass plate projection
US5235362A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1992 |
| Grant date | Aug 10, 1993 |
| Priority date | — |
| Expiry date | Jul 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/30
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A slide projector which is suitable for both wall projection and ground-glass plate projection has a displacement means carrying a deflection mirror system and a ground-glass plate. The displacement means is movable between a collapsed condition in which the displacement means with mirror system and ground-glass plate is in a compact configuration in a housing compartment beneath the projector, for wall projection purposes, and a deployed condition for ground-glass plate projection purposes, in which the displacement means is moved out of the housing compartment into a position in which the mirror system and the ground-glass plate are in front of the lens system of the projector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.