Presentation device for overhead projector
US4950072A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Apr 25, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S353/05
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A presentation device for an overhead projector of this invention includes a frame-shaped casing, a transmissive-type liquid crystal panel fixed in the casing, first and second protective covers mounted on the casing to have predetermined gaps from the liquid crystal panel and to cover both surfaces of the liquid crystal panel, and exhaust fans disposed in the casing. In order to detachably mount the first and second protective covers to the casing, locking pawls and locking pieces which can be elastically deformed are formed on the outer edges of the first and second protective covers, and the notches and fitting holes to which the locking pawls and the locking pieces can be respectively fitted are formed in the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.