Title:
FIXED FOCAL LENGTH LENS SYSTEM AND CAMERA
Document Type and Number:
WIPO Patent Application WO/2018/135269
Kind Code:
A1
Abstract:
A fixed focal length lens is constituted of, in order from an object side to an image side, a first lens element (L1) having negative power, a second lens element (L2) having negative power, a third lens element (L3) having positive power, a fourth lens element (L4) having power, a fifth lens element (L5) having power, and a sixth lens element (L6) having positive power. At least one lens element of the second lens element (L2) through sixth lens element (L6) is formed from glass. Furthermore, the following conditional formula (1) is satisfied.
0 < (L1R2 + L2R1)/(L1R2 − L2R1) < 100 .... (1)
wherein L1R2 is the radius of curvature of the image side surface of the first lens element L1, and L2R1 is the radius of curvature of the object side surface of the second lens element L2.
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Inventors:
IKEO AYA
IWASHITA TSUTOMU
IWASHITA TSUTOMU
Application Number:
PCT/JP2017/046902
Publication Date:
July 26, 2018
Filing Date:
December 27, 2017
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JP2016031531A | 2016-03-07 | |||
| JP2010009028A | 2010-01-14 | |||
| JPH08160296A | 1996-06-21 | |||
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| JP2007164079A | 2007-06-28 | |||
| JP2014134563A | 2014-07-24 | |||
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| JP2009288300A | 2009-12-10 |
Other References:
See also references of EP 3572859A4
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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