Title:
WIDE-ANGLE OPTICAL SYSTEM, LENS UNIT AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/170283
Kind Code:
A1
Abstract:
A wide-angle optical system for use in imaging is provided which has excellent environment resistance while being compact, high-performance, low-cost and wide-angle. In order from the object side, this imaging lens (the wide-angle optical system) 10 substantially consists of a negative first lens L1 which has a convex shape on the object side and a concave shape on the image side, is made of glass and is spherical on both sides, a negative second lens L2 which has a aspherical surface on at least one side and which has a concave shape on the image side, a positive third lens L3, an aperture stop ST, a fourth lens L4 which has an aspherical surface on at least one side, and a fifth lens L5 which has an aspherical surface on at least one side. This optical system satisfies the conditional expressions (1) and (2), which relate to the values D14/D1L and D24/SAG2.
Inventors:
NAKAMURA KENTAROU (JP)
Application Number:
PCT/JP2017/012180
Publication Date:
October 05, 2017
Filing Date:
March 24, 2017
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B13/04; G02B7/02; G02B13/18
Foreign References:
| JPH08122634A | 1996-05-17 | |||
| US20150168676A1 | 2015-06-18 | |||
| JP2007199344A | 2007-08-09 |
Attorney, Agent or Firm:
FUKUDA, Mitsuhiro (JP)
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