Eyepiece lens

Details Eyepiece lens Eyepiece lens

2006-11-07

2006-11-07

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

Eyepiece

C359S761000, C359S770000

Reexamination Certificate

active

07133210

ABSTRACT:
An eyepiece lens includes first lens group G1having a negative refracting power including a negative meniscus lens with a concave surface facing eyepoint E.P side, second lens group G2having a positive refracting power including a lens with both convex surfaces on both ends, and third lens group G3having a negative refracting power including a negative lens. The first–third lens groups are arranged in an order from eyepoint E.P side, and the eyepiece lens is capable of varying a diopter by moving the second lens group along an optical axis. The eyepiece lens is configured by aspherical surfaces to make the positive refracting power weak while at least one surface of the convex surfaces of the lens deviates from the optical axis. Further, conditions of a following formula are satisfied:in-line-formulae description="In-line Formulae" end="lead"?1.6<f1/f3<2.5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−0.55<S3≦0in-line-formulae description="In-line Formulae" end="tail"?where a focal length of first lens group G1indicated f1, a focal length of third lens group G3indicates f3, and a shape factor of third lens group G3indicates S3, (provided shape factor S3 is defined by a conditional formulain-line-formulae description="In-line Formulae" end="lead"?S3=(re3+rs3)/(re3−rs3)in-line-formulae description="In-line Formulae" end="tail"?where re3indicates a radius of curvature of third lens group G3on the eyepoint side and rs3indicates a radius of curvature thereof on the object side, and the formula is computed with a paraxial radius of curvature when the surface is the aspherical surface.).

REFERENCES:
patent: 5255121 (1993-10-01), Suzuki
patent: 6052234 (2000-04-01), Mukai et al.
patent: 6263168 (2001-07-01), Hasushita et al.
patent: 2005/0013011 (2005-01-01), Oshita
patent: 09-329752 (1997-12-01), None
patent: 2000-171731 (2000-06-01), None
patent: 2001-100115 (2001-04-01), None
patent: 2001-311881 (2001-11-01), None
patent: 2001-324684 (2001-11-01), None
patent: 2003-215471 (2003-07-01), None
patent: 2004-258234 (2004-09-01), None
patent: 2005-55874 (2005-03-01), None

Affiliated with

Also associated with

Rating

Eyepiece lens does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Eyepiece lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Eyepiece lens will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3705830