Signals and indicators – Navigation devices
Patent
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
Punter William H.
Thomson - CSF
LandOfFree
Head-mounted or helmet-mounted sighting device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Head-mounted or helmet-mounted sighting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Head-mounted or helmet-mounted sighting device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-293357