Head-mounted or helmet-mounted sighting device

Details Head-mounted or helmet-mounted sighting device Head-mounted or helmet-mounted sighting device

1983-02-22

1985-11-05

Punter, William H.

Signals and indicators

Navigation devices

33262, 116202, G02F 121, G01C 906, F21Q 300

Patent

active

045509840

ABSTRACT:
An image forming a sighting reticle can be displayed at infinity in the landscape under observation without any need for a collimating optical system. To this end, a birefringent crystal plate having parallel faces is placed between two crystal plates employed as polarizing filters and consisting respectively of a polarizer and an analyzer in order to produce the reticle in the form of interference fringes centered on the line of sight. The very lightweight sighting device can be integrated in one eye-glass of a spectacle frame or in a helmet visor. Complementary diodes can be incorporated in the device for providing information relating to directional prepositioning and the like.

REFERENCES:
patent: 2352644 (1944-07-01), Linderman, Jr. et al.
patent: 2420252 (1947-05-01), Land
patent: 3060308 (1962-10-01), Fortuna
patent: 3262210 (1966-07-01), Shapiro et al.
patent: 3498293 (1970-03-01), Oppenheimer
patent: 4193689 (1980-03-01), Reymond et al.
patent: 4396885 (1983-08-01), Constant

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