Image projection systems
US4184755A · kind A · utility
Inventors
Key dates
| Filing date | Oct 11, 1977 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Oct 11, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/56
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improvement for use in image projection systems of the type which project an image from a substrate where a projector causes the image to be displayed on a receiving member such as a projection screen remote from the projector. One important facet of the improvement resides in the receiving member, i.e., the projection screen. These systems are typically used for displaying scores in bowling games from a projector at the player end to a screen or receiving member at the scoring end. Projectors of this type normally comprise a projector base with a mirror system and a socket which has a light source therein located in relation to the mirror system. The improvement comprises a bracket which is replaceable for the original socket and light source therein. The bracket includes a plate having an improved light socket mounted on the plate. In addition, the bracket includes mounting means having apertures to receive conventional fasteners. These apertures are located in a positional relationship with apertures which received conventional fasteners for mounting the original socket. The improvement light source is capable of being inserted into the improvement socket and contains a filam…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.