External gunsight eyepiece attachment
US4993819A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1989 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Dec 6, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF41G3/2644
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In an external gunsight viewing apparatus, a housing is provided having a first port coupled to the eyepiece of a gunner's optical sight. A prism is disposed along a common axis between the gunner's eyepiece and a viewing port. The prism folds the image path to an Erfle lens which produces an internal image. The internal image is viewable through a beam combining means, along with a second projected image, folded via a mirror, into the image combining means. A second relay means and additional mirror means direct the combined image along a relay means where they are located along the common axis between the eyepiece and first viewing port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.