Riflescope utilizing gradient index lenses

Optical: systems and elements – Compound lens system – With relay

Patent

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Details

359653, G02B 2702

Patent

active

H00013218

ABSTRACT:
Riflescope arrangement includes a tube containing an eye piece section fowed by a relay section which is followed by an objective section. The eye piece, relay and objective sections lie along and are aligned with the optical axis of the riflescope. The front optical element of the objective section is in the form of an axial gradient index element to add a degree of freedom for chromatic and other corrections, without adding an extra element or weight to the riflescope.

REFERENCES:
patent: 3612646 (1971-10-01), Walker et al.
patent: 4859040 (1989-08-01), Kitagishi et al.

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