专利名称：Observation optical system, viewfinder
equipped with observation optical systemand method for manufacturing observationoptical system
发明人：Taku Matsuo申请号：US13237905申请日：20110920公开号：US09454062B2公开日：20160927
专利附图：
摘要：An observation optical system for observing an object includes, in order from
the object side: a first lens having positive refractive power; a second lens having negativerefractive power and a concave surface facing the object side; and a third lens havingpositive refractive power and a convex surface facing an eyepoint side. An asphericalsurface is included on at least one lens surface, and given conditional expressions aresatisfied, thereby providing a compact observation optical system having excellentoptical performance, a viewfinder equipped with the observation optical system, and amethod for manufacturing the observation optical system.
申请人：Taku Matsuo
地址：Kawasaki JP
国籍：JP
代理机构：Shapiro, Gabor and Rosenberger, PLLC
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