Binocular periscope viewing device including triple prism for im

Details Binocular periscope viewing device including triple prism for im Binocular periscope viewing device including triple prism for im

1986-07-11

1988-04-12

Henry, Jon W.

350542, 350171, 350286, G02B 2304, G02B 2312, G02B 2308, G02B 2710

Patent

active

047370238

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) downwardly to a vertical optical path (24). An objective 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.

REFERENCES:
patent: 2693128 (1954-11-01), Dewhurst
patent: 4261646 (1981-04-01), Kotaka
patent: 4309078 (1982-01-01), Hara et al.
patent: 4383741 (1983-05-01), Vogl et al.
patent: 4634223 (1987-01-01), Ishii

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