Device for determining the portion of a field seen by the eye of an observer
US5311225A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1992 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Nov 30, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/145
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Device intended to determine the portion of a field seen by the eye (5) of an observer. According to the invention, this device includes: PA1 an optical sighting system (2, 3) through which said eye (5) looks at said field, said optical system comprising an exit eyepiece (15) behind which said eye (5) is placed; and PA1 a first optical component (22) placed on the side of the object focal plane of said exit eyepiece (15), said first optical component letting through the light rays (16) which come from said field and which pass through said optical sighting system and sending to said eye (5) a light beam (24) emitted by a light source (23) in order to form at least one reflection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.