Title:
IMAGING LENS, LENS UNIT, AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/170843
Kind Code:
A1
Abstract:
A low-cost imaging lens is provided which has a long back focus, ensures a wide angle of view, has excellent optical performance while having a large diameter, and has minimal focus shift during environment changes. From the object side, the imaging lens 10 substantially consists of a first lens L1 which is formed from glass, has negative power, and has a concave shape on the image side, a second lens L2 which is formed from glass and has positive power, a third lens L3 which is formed from plastic, has negative power and has at least one aspherical shape, and a fourth lens L4 which is formed from plastic, has positive power and has at least one aspherical shape; this imaging lens satisfies conditional expression (1) relating to the value f12/f, conditional expression (2) relating to the value f3/f4, and conditional expression (3) relating to the value D34/f.
Inventors:
NAKAMURA KENTAROU (JP)
Application Number:
PCT/JP2017/013195
Publication Date:
October 05, 2017
Filing Date:
March 30, 2017
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G02B13/04; G02B13/18
Domestic Patent References:
| WO2013014913A1 | 2013-01-31 |
Foreign References:
| US20120113530A1 | 2012-05-10 | |||
| JP2003035867A | 2003-02-07 | |||
| JPH10288736A | 1998-10-27 | |||
| JP2012203274A | 2012-10-22 | |||
| JP2015034885A | 2015-02-19 | |||
| JP2002365535A | 2002-12-18 | |||
| JP2015143796A | 2015-08-06 |
Attorney, Agent or Firm:
FUKUDA, Mitsuhiro (JP)
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