Projector
US3988059A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 23, 1975 |
| Grant date | Oct 26, 1976 |
| Priority date | — |
| Expiry date | Jun 23, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide angle projector is disclosed for projecting an image having an illuminated and unilluminated region on either side of a straight boundary region which defines a datum plane established by the orientation of the projector. The image is detected at a position removed from the projector by an instrument which establishes the center of the boundary region and indicates its position to indicate the position of the datum plane. The wide angle projection is accomplished by the use of cylindrical reflecting optics bounded by reflecting sidewalls and a reticle in the form of an occluding knife edge or a knife edge at the edge of a reflecting surface, depending on the particular projection system utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.