Eyepiece optical system and electronic view finder...

Optical: systems and elements – Lens – Eyepiece

Reexamination Certificate

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Details

C359S683000, C359S689000, C359S690000, C359S716000, C359S784000, C359S785000, C396S378000, C396S379000, C396S382000, C396S383000

Reexamination Certificate

active

07978417

ABSTRACT:
The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.Alternatively, the eyepiece optical system is characterized by comprising a first lens group having a curved refractive surface, and a rear lens group having positive refracting power, wherein while the first lens group remains fixed, the rear lens group moves along an optical axis with satisfaction of given conditions, thereby implementing diopter adjustment.

REFERENCES:
patent: 6847494 (2005-01-01), Cahall
patent: 7391968 (2008-06-01), Takato
patent: 2010/0290129 (2010-11-01), Nishio et al.
patent: 2001-272610 (2001-10-01), None
patent: 2002-048985 (2002-02-01), None
patent: 2002-082290 (2002-03-01), None
patent: 2002-365562 (2002-12-01), None
patent: 2004-258653 (2004-09-01), None
patent: 2007-225835 (2007-09-01), None
patent: 2007-264179 (2007-10-01), None
patent: 2008-107380 (2008-05-01), None
patent: 2008-203290 (2008-09-01), None

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