Title:
VARIABLE-POWER OPTICAL SYSTEM
Document Type and Number:
WIPO Patent Application WO/2015/125480
Kind Code:
A1
Abstract:
This optical system includes an objective optical system (O), a relay optical system (R), and an eyepiece optical system (E), in that order from the object side. The relay optical system is provided with a first lens group (G1) having positive refractive power, a second lens group (G2) having positive refractive power, and a third lens group (G3) having positive refractive power, in that order from the object side. Furthermore, the relay optical system is capable of reforming, with varying degrees of magnification, the image formed by the objective optical system. This optical system is configured such that, when ｜β｜min represents the minimum absolute value of the image-formation magnification of the relay optical system, and fmin represents the shortest focal distance, 0.7 <｜β｜min < 1.4 and 12 (mm) < fmin < 15 (mm) are satisfied.
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Inventors:
MIYAZAKI YOSUKE (JP)
Application Number:
PCT/JP2015/000788
Publication Date:
August 27, 2015
Filing Date:
February 19, 2015
Export Citation:
Assignee:
NIKON VISION CO LTD (JP)
International Classes:
G02B15/167; G02B23/14; G02B25/00
Foreign References:
| JP2004226544A | 2004-08-12 | |||
| JP2013025279A | 2013-02-04 | |||
| JPH03287146A | 1991-12-17 | |||
| JPH07181384A | 1995-07-21 | |||
| JP2007199336A | 2007-08-09 | |||
| US20070159685A1 | 2007-07-12 | |||
| JPH0346608A | 1991-02-27 | |||
| JPH0337611A | 1991-02-19 |
Other References:
See also references of EP 3109684A4
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
Shogo Onishi (JP)
Shogo Onishi (JP)
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