Panasonic Intellectual Property Management Co., Ltd.

Yutaro Sonoyama

Naoto Nishimura

An imaging optical system includes: a first lens having negative power and having a concave image-side surface; a second lens having power; a third lens having positive power; a fourth lens having power; and a fifth lens having power. The imaging optical system satisfies conditions expressed by the following Inequalities (1) and (2):<0.25   (1)sum<0.15   (2)where Ris a paraxial radius of curvature of an object-side surface of the first lens, TTL is a total optical length of the imaging optical system, ThLis a thickness of the first lens on an optical axis of the imaging optical system, and Thsum is a sum of respective thicknesses of all lenses, including the first to fifth lenses, on the optical axis of the imaging optical system.

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Osaka, Japan

Yutaro Sonoyama