PROBLEM TO BE SOLVED: To provide a light collection optical system which offers both compactness and a wide view angle, as well as minimized aberrations including field curvature.SOLUTION: A light collection optical system has a lens configuration comprising a first group having positive power and a second group having positive power arranged in order from a point light source side. The first group comprises in order from the point light source side a meniscus lens having a concave surface on the point light source side a positive lens having a convex surface on an observed object side a positive lens having a convex surface on the point light source side a negative lens having a concave surface on the observed object side a cemented lens having a concave surface on the point light source side and a convex surface on the observed object side and comprising a negative lens and a positive lens and a positive lens having a convex surface on the observed object side. The second group comprises in order from the point light source side a positive lens having a convex surface on the point light source side a cemented lens comprising a negative lens and a positive lens a positive lens and a meniscus lens having a concave surface on the observed object side. Surface shape of the meniscus lens of each group satisfies predetermined conditions.COPYRIGHT: (C)2014,JPO&INPIT【課題】小型化及び広画角化の両立を試みると、像面湾曲を含む諸収差の発生を抑えることができない。【解決手段】集光光学系を、点光源側から順に、正のパワーを持つ第1群、正のパワーを持つ第2群を持つレンズ構成とする。第1群は、点光源側から順に、点光源側に凹面を向けたメニスカスレンズ、被検面側に凸面を向けた正レンズ、点光源側に凸面を向けた正レンズ、被検面側に凹面を向けた負レンズ、点光源側に凹面を向け被検面側に凸面を向けた、負レンズと正レンズからなる接合レンズ、被検面側に凸面を向けた正レンズを有する。第2群は、点光源側から順に、点光源側に凸面を向けた正レンズ、負レンズと正レンズからとなる接合レンズ、正レンズ、被検面側に凹面を向けたメニスカスレンズを有する。各群のメニスカスレンズの面形状は、所定の条件を満たすように構成される。【選択図】図3
