Title:
IMAGE-CAPTURING OPTICAL SYSTEM AND IMAGE-CAPTURING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/221947
Kind Code:
A1
Abstract:
This optical system (10) is constituted by: a first lens group (G1) that is arranged on an object side (11) with respect to an aperture stop (St) and that has a positive refractive power as a whole; and a second lens group (G2) that is arranged on an image surface side (12) and that has a negative refractive power as a whole. The first lens group (G1) includes: a first negative lens (L1) that is arranged most toward the object side and that is concave toward the object side; and a first meniscus lens (L2) that is arranged adjacent to the first negative lens (L1), is convex toward the object side, and has a positive refractive power. The radius of curvature R1 of the object-side surface of the first negative lens (L1) and the focal distance f of the optical system satisfy the following condition (1): -1.5 < R1/f < -0.6 … (1).
Inventors:
SAWAMOTO AKIRA (JP)
Application Number:
PCT/JP2017/022755
Publication Date:
December 28, 2017
Filing Date:
June 20, 2017
Export Citation:
Assignee:
NITTOH INC (JP)
International Classes:
G02B13/02
Foreign References:
| JP2000321490A | 2000-11-24 | |||
| JPH02238416A | 1990-09-20 | |||
| JPH11281890A | 1999-10-15 | |||
| JPH07253542A | 1995-10-03 | |||
| JPH0667092A | 1994-03-11 | |||
| JP2001201683A | 2001-07-27 | |||
| JPH09152549A | 1997-06-10 |
Other References:
See also references of EP 3474057A4
Attorney, Agent or Firm:
IMAI, Akira (JP)
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