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Title:
VARIABLE-MAGNIFICATION OPTICAL SYSTEM AND IMAGE PICKUP DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/185955
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a variable-magnification optical system and an image pickup device provided with the variable-magnification optical system, which enable the realization of a high-resolution observation image display system that can freely change the observation visual field, while maintaining the small size of an observation optical system and without causing the operation distance of the observation optical system to change. In order to solve this problem: this variable-magnification optical system comprises a first lens group G1, which is connected to the observation optical system and is disposed closest to the observation optical system side, a final lens group (G4), which is disposed closest to the image side, and a plurality of moveable lens groups (G2, G3) which are disposed between the first lens group G1 and the final lens group and which can move in the optical axis direction; and the variable-magnification optical system is configured so that the first lens group G1 and the final lens group are fixed in the optical axis direction, magnification is varied by causing the plurality of moveable lens groups to move in the optical axis direction, and focusing from the farthest-point object to the nearest-point object is carried out by causing at least one of the plurality of moveable lens groups to move in the optical axis direction.

Inventors:
OBIKANE, Yasuhiko (Ltd. 1385 Hasunuma Minuma-ku, Saitama-sh, Saitama 56, 〒3378556, JP)
Application Number:
JP2017/036785
Publication Date:
October 11, 2018
Filing Date:
October 11, 2017
Export Citation:
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Assignee:
TAMRON CO., LTD. (1385 Hasunuma, Minuma-ku Saitama-sh, Saitama 56, 〒3378556, JP)
International Classes:
G02B15/167; A61B1/00; G02B15/20; G02B23/26; G03B5/00
Domestic Patent References:
WO2016129055A12016-08-18
WO2015087619A12015-06-18
Foreign References:
JP2004361778A2004-12-24
JP2002207167A2002-07-26
Attorney, Agent or Firm:
YOSHIMURA, Katsuhiro (Yoshimura International Patent Office, Omiya F Bldg. 5-4, Sakuragicho 2-chome, Omiya-ku, Saitama-sh, Saitama 54, 〒3300854, JP)
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