Optical system for laser riflescope

Details Optical system for laser riflescope Optical system for laser riflescope

2006-11-28

2006-11-28

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S643000, C359S644000

Reexamination Certificate

active

07142374

ABSTRACT:
An optical system for a laser riflescope includes, an objective lens group (1), an eyepiece lens element (3) defining an optical axis with the objective lens group, and an erector lens group (2) positioned between the objective lens group and the eyepiece lens element. The eyepiece lens element includes an aspheric element having a diffractive configuration (33). The aspheric element combines with a spherical lens so as to form a hybrid lens. Thus, the spherical aberration of the optical system is eliminated by the aspheric element and the chromatic aberration is eliminated by the diffractive configuration.

REFERENCES:
patent: 2005/0094283 (2005-05-01), Cheng

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