Optical viewing and near infrared tracking system for a portable

Details Optical viewing and near infrared tracking system for a portable Optical viewing and near infrared tracking system for a portable

1992-01-21

1993-03-09

Lerner, Martin

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359359, 359583, 359589, G02B 110, G02B 528, G02B 1314

Patent

active

051930250

ABSTRACT:
An optical system (10) for portable missile launcher (23) includes an objective lens (12) for receiving the entire visual and near infrared light energy emanating from a target (14) and immediate background of the target. The light energy from the objective lens then passes through a Porro prism assembly (16) which acts to direct visual light along a first path to an eyepiece (20) and near infrared along a second path at approximately a right angle to the first path where it is received by a tracker assembly (22) and monitored. The Porro prism (16) is constructed in accordance with this invention to include a multi-layer interference dichroic coating (18) disposed between the two prisms (34,36) which make up the prism assembly. This coating is of such a nature as to readily permit light energy in the visual range to pass directly through the coating, but at the same time to reflect the near infrared components along a second path bringing them to focus on the tracker assembly (22).

REFERENCES:
patent: 2700323 (1955-01-01), Schroder
patent: 4260021 (1981-04-01), Traeger et al.
patent: 4733926 (1988-03-01), Title
patent: 4881796 (1989-11-01), Michika et al.
patent: 5022723 (1991-06-01), Schmidt et al.
patent: 5084780 (1992-01-01), Phillips

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