Lamp and lens retrofit assembly for overhead projector
US4023893A · kind A · utility
4Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1976 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Jun 28, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A retrofit assembly for replacing a lens-containing lamp in an overhead projector. The assembly comprises a quartz-halogen lamp, having an internal reflector and an enlarged base removably mounted in the projector, and a lens holding bracket removably mounted in the projector in alignment with the lamp. The bracket is resiliently pivoted toward the lamp and has a tab for striking the lamp base to retain the lens at a predetermined distance from the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.