Periscopic sight with a unitary lens system

Details Periscopic sight with a unitary lens system Periscopic sight with a unitary lens system

1978-10-23

1981-06-30

Bentley, Stephen C.

Ordnance

Mounts

Training mechanisms

350 52, F41G 140

Patent

active

042756391

ABSTRACT:
A periscopic sight is mounted to extend through the wall of protective armor surrounding a gun station. An elevation mirror is exposed to receive light from the direction in which the gun is pointing and to reflect the light along a vertical path extending through the sight. A sealed unitary lens system has a lens axis aligned with the vertical path and conducts the light therethrough to a stationary mirror accessible to the eye of an observer. The sealed unitary lens system has a sufficiently long eye relief to provide an unobstructed image to the observer in spite of the placement of the stationary mirror between the lens system and the observer.

REFERENCES:
patent: 683204 (1901-09-01), Grubb
patent: 694904 (1902-03-01), Youlten
patent: 725839 (1903-04-01), Grubb
patent: 2307759 (1943-01-01), Crawford
patent: 2412298 (1946-12-01), Siazik
patent: 3454322 (1969-07-01), Scidmore et al.
Donald H. Jacobs, Fundamentals of Optical Engineering, McGraw Hill, 1943, p. 197.
Redfield 1978 Rifle Scope Catalog, pp. 1-6.

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