Reflection-type overhead projector
US4811110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1988 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Apr 18, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/045
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A reflection-type overhead projector having a projection lamp and projection lens-and-mirror system disposed above a base on a gooseneck arm for projecting a transparency placed on the base on a remote screen. The overhead projector has a copying device incorporated therein for making a copy from a reflective original on a secondary original or a transparency, which comprises an image-scanning head movable lengthwise over the reflective original placed on a Fresnel mirror on the base to provide image signals; a mirror attached to the image scanning head for directing light from the projection lamp onto the reflective original just below the image scanning head; and a thermal printing head for thermally printing an image of the reflective original on a secondary original or a transparency according to the image signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.