Binocular periscope viewing device including triple prism for image splitting and elongate head column
US4820031A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1988 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Feb 8, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/143
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A binocular periscope (10) viewer includes a columnar glass prism (52) disposed in a vertical optical path (24) and an angled internal reflective surface (51) for redirecting the image from a horizontal path (22) an object lens assembly (54), a night vision image intensifier tube (56) and a collimator (58) are all disposed in the vertical optical path (24) and further condition the image for presentation to a triple prism (60). The triple prism (60) includes a first prism (62) integral with a second prism (64) and a third prism (66). Prism (62) is disposed in the vertical optical path (24) and redirects the image into a forward horizontal optical path (70). Each of prisms (64, 66) receive essentially the entire redirected image, and further redirect such image into oppositely directed lateral horizontal optical paths (26, 28). The triple prism (60) is mounted to a cradle (106) which is secured to the frame (12) of the viewing system. Turning mirrors (90, 92) redirect the image into parallel common forward horizontal paths (30, 32) for individual viewing by an observer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.