Patent ID: 7978417
Filing Date: 2011-07-12
Classification: G02B

Abstract:
1. An eyepiece optical system, 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 having positive refracting power, wherein: a total number of lenses in said eyepiece optical system is 3, an object-side concave lens surface in said first lens group is an aspheric surface, an object-side concave lens surface in said second lens group is an aspheric surface, and an exit-side lens surface in said third lens group is an aspheric surface.