Optical device designed for the introduction of a collimated ima

Details Optical device designed for the introduction of a collimated ima Optical device designed for the introduction of a collimated ima

1991-07-22

1992-10-20

Henry, Jon W.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359353, 359351, 359400, 359419, G02B 2310, G02B 2312, G02B 2710

Patent

active

051575485

ABSTRACT:
The disclosure relates to optical devices enabling daytime vision and night vision of an external scene with, in both cases, the superimposed introduction, into an observer's visual field, of an image given by an image generator. The image given by the light intensifier of a night observation system is processed in the same way as the image given by the image generator, by an auxiliary image-combining optical system which mixes these two images before they reach the main image-combining optical system of the device through which, in night vision, the observer directly sees the external scene. The auxiliary image-combining optical system is designed so that, in night vision, at least the greatest part of the light coming from the image generator reaches the main image-combining optical system. Depending on the embodiment, this result is obtained either with a retractable semi-reflecting mirror or with a semi-reflecting surface selective in frequency.

REFERENCES:
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patent: 4193666 (1980-03-01), Cojan
patent: 4260217 (1981-04-01), Tracqer et al.
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patent: 4653879 (1987-03-01), Filipovich
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patent: 4993819 (1991-02-01), Moorhouse
Optical Engineering, vol. 23, May-Jun. 1984, pp. 331-333, Jamieson, "Channel Interaction in an Optical Fire Control Sight".

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