Title:
SINGLE-FOCUS LENS SYSTEM AND CAMERA
Document Type and Number:
WIPO Patent Application WO/2019/031266
Kind Code:
A1
Abstract:
Sequentially from the object side to the image side, the present invention is provided with: a first lens element (L1) having negative power, said first lens element having a convex surface on the object side; a second lens element (L2) having positive power, said second lens element having a concave surface on the object side; a third lens element (L3) having positive power; a fourth lens element (L4) having negative power; and a fifth lens element (L5) having positive power. Furthermore, the half viewing angle of the present invention is 50 degrees or more, and the object-side convex surface shape of the first lens element (L1) has at least one inflexion point outside of an optical axis. Consequently, a single-focus lens system wherein various aberrations can be excellently corrected can be provided.
Inventors:
IWASHITA TSUTOMU
Application Number:
PCT/JP2018/028173
Publication Date:
February 14, 2019
Filing Date:
July 27, 2018
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G02B13/04; G02B13/18
Foreign References:
| JP2004354572A | 2004-12-16 | |||
| JP2005010521A | 2005-01-13 | |||
| JP2009145839A | 2009-07-02 | |||
| US20110176049A1 | 2011-07-21 | |||
| US20130107376A1 | 2013-05-02 | |||
| US20160124183A1 | 2016-05-05 | |||
| US20170045713A1 | 2017-02-16 | |||
| US20150268446A1 | 2015-09-24 | |||
| US9557534B1 | 2017-01-31 | |||
| US9715088B1 | 2017-07-25 | |||
| JP2017173807A | 2017-09-28 |
Attorney, Agent or Firm:
KAMATA Kenji et al. (JP)
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