F - Mech Eng,Light,Heat,Weapons – 41 – F
Patent
F - Mech Eng,Light,Heat,Weapons
41
F
F41F 1/00 (2006.01) G02B 5/28 (2006.01) G02B 23/04 (2006.01) G02B 27/10 (2006.01)
Patent
CA 2083090
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).
Carlson James J.
Noyes Gary R.
Hughes Aircraft Company
Sim & Mcburney
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