Eyepiece lens

Details Eyepiece lens Eyepiece lens

2006-09-05

2006-09-05

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

Eyepiece

C359S643000

Reexamination Certificate

active

07102827

ABSTRACT:
The object of the present invention is to provide an eyepiece lens having a large pupil diameter of 10 mm or more, securing higher magnification, equipped with a high quality diopter adjustment function at low cost. The eyepiece lens includes, in order from an eye point side EP, a negative meniscus lens L1having a concave surface facing to the eye point side EP, a double convex lens L2, and a negative lens L3. Diopter of the eyepiece lens is adjusted by moving the double convex lens L2along an optical axis. At least one surface of the double convex lens L2has an aspherical surface having positive refractive power getting weaker in accordance with increase in a distance to the surface from the optical axis, and given conditional expressions are satisfied.

REFERENCES:
patent: 5815317 (1998-09-01), Omura
patent: 6130785 (2000-10-01), Abe et al.
patent: 6263168 (2001-07-01), Hasushita et al.
patent: 9-329752 (1997-12-01), None
patent: 11-109259 (1999-04-01), None
patent: 2000-098266 (2000-04-01), None
patent: 2001-100115 (2001-04-01), None

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