Patent Number: 6,166,862

Title: Designing method of zoom optical system

Abstract: A designing method of a zoom optical system wherein each zoom unit is formed of one optical element has steps of: selecting a spherical system, a gradient index system or a diffractive optical system and at least one more system as systems constituting the degree of design freedom of each zoom unit, optimizing each zoom unit with respect to third-order aberrations and chromatic aberration; and using an optical solution obtained by said optimizing step as the design start data.

Inventors: Hashimura; Junji (Sakai, JP), Ori; Yuichiro (Moriyama, JP)

Assignee: Minolta Co., Ltd.

International Classification: G02B 15/14 (20060101); G02B 003/00 (); G02B 015/14 ()

Expiration Date: 12/26/2013