OPTICAL SYSTEM AND OPTICAL DEVICE PROVIDED WITH SAME

WIPO Patent Application WO/2020/183622

A1

Provided are an optical system which is bright and has high resolution, and an optical device provided with the optical system.　In the optical system, an enlargement-side conjugation point Po positioned on an enlargement side and a reduction-side conjugation point Pi positioned on a reduction side are conjugated, the distance from the optical system to the enlargement-side conjugation point Po being greater than the distance from the optical system to the reduction-side conjugation point Pi, the optical system having a hyperhemispherical meniscus lens LE, the hyperhemispherical meniscus lens LE having a reduction-side surface R1 positioned on the reduction side and an enlargement-side surface R2 positioned on the enlargement side, the reduction-side surface R1 being a curved surface which is concave on the reduction side, the enlargement-side surface R2 being a curved surface which is convex on the enlargement side and which has positive refractive power, the curved surface of the enlargement-side surface R2 being more than hemispherical, the intersection point Pc1 of the reduction-side surface R1 and the optical axis AX of the optical system being positioned further toward the enlargement side than the reduction-side conjugation point Pi, and the reduction-side intersection point P1 being positioned further toward the reduction side than the reduction-side conjugation point Pi.

TOGINO TAKAYOSHI (JP)

PCT/JP2019/010087

September 17, 2020

March 12, 2019

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OLYMPUS CORP (JP)

G02B21/02; G02B13/16; G02B13/18; G02B25/00

JPH06148564A	1994-05-27
JPH1123931A	1999-01-29
CN206724078U	2017-12-08
JPH031986Y2	1991-01-21
JP2007121338A	2007-05-17

SAITO Keisuke (JP)

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