Parallax free optical sighting device
US5189555A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 8, 1990 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | May 8, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A parallax free sight which utilizes a concave-convex lens with a parabolic shaped optical surface attached to one end of a light channel, the concave side of the lens faces into the light channel, the perimeter dimensions of the lens is adapted to the rectangular shape and dimensions of the light channel, with the longer sides of the rectangular lens perimeter positioned in a horizontal plane when the sight is in use. A transparent body is attached to the other end of the light channel. A light emitting source is arranged at the focal point of the concave side of the lens, between the lens and the transparent body. The light source can be a light emitting material or an electrical light source, powered by a rechargeable battery or a solar cell, or both. A light reflective layer is attached to the concave side of the lens to only reflect light of the wavelengths corresponding to the light emitted by the light emitting source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.