Title:
LENS SYSTEM AND IMAGE CAPTURE DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/047112
Kind Code:
A1
Abstract:
A lens system according to the present disclosure comprises a plurality of lens groups each of which is configured with at least one lens element. The lens system is formed in order from the object side to the image side from a first lens group which is fixed with respect to the image plane when focusing from an infinity focus state to a proximate focus state, an aperture, a second lens group which moves in an optical axis direction when focusing, a third lens group which is fixed with respect to the image plane when focusing, a fourth lens group which moves in the optical axis direction when focusing, and an image-side-most lens group. The lens system satisfies the following conditions (1) and (2):
2.5 < |f2/f4| < 6.5 ... (1);
0.5 < |f/f4| < 1.5 ... (2);
wherein f2 is the focal length of the second lens group, f4 is the focal length of the fourth lens group, and f is the focal length of the optical system overall when infinity focusing.
Inventors:
IIYAMA TOMOKO
SUEYOSHI MASAFUMI
SUEYOSHI MASAFUMI
Application Number:
PCT/JP2015/004749
Publication Date:
March 31, 2016
Filing Date:
September 17, 2015
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
G02B13/00
Domestic Patent References:
| WO2014118865A1 | 2014-08-07 |
Foreign References:
| JPH1172705A | 1999-03-16 | |||
| JP2014142601A | 2014-08-07 | |||
| US20140240554A1 | 2014-08-28 | |||
| JP2014160229A | 2014-09-04 | |||
| JP2014052413A | 2014-03-20 |
Other References:
See also references of EP 3199999A4
Attorney, Agent or Firm:
FUJII, Kentaro et al. (JP)
Fujii Kentaro (JP)
Fujii Kentaro (JP)
Download PDF: