Ballistic protected periscope construction

Details Ballistic protected periscope construction Ballistic protected periscope construction

1978-01-16

1979-04-17

Henry, Jon W.

G02B 2308

Patent

active

041497783

ABSTRACT:
A periscope has a pair of solid plastic, transparent prismatic-shaped blocks of optical material which are mounted within a protective housing which extends through an opening in an armored vehicle for safely viewing an exterior field of view from within the protected vehicle. Each of the blocks has a reflective surface and a viewing surface and are separated from each other by a void. A hollow transparent cell is mounted within and fills the void between the spaced blocks and is bonded to the blocks by a clear optical adhesive. The cell provides a shock isolation effect between the periscope block which is exposed to impact from enemy gunfire, etc., and the other periscope block located within the vehicle without affecting the physical and optical properties of the periscope. The cell reduces transmission of the shock waves between the solid blocks and prevents foreign objects from entering the void and distorting the optical viewing system. The cell preferably is filled with an inert gas such as dry nitrogen or may have a vacuum formed therein.

REFERENCES:
patent: 2361050 (1944-10-01), Paddock

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