Title:
OCULAR LENS SYSTEM, AND IMAGE OBSERVATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/019605
Kind Code:
A1
Abstract:
The present invention addresses the problem of achieving an ocular lens system having a large allowable decentering amount. This ocular lens system enlarges an image of an observation object and forms a virtual image thereof. The ocular lens system is characterized in that: the horizontal angle of view thereof is at least 40˚; the change amount (∆) (in mm) in field curvature in a tangential direction, with respect to a decentering amount (S) (in mm) between an optical axis (Ax) and an eye of an observer, satisfies, for all image heights, condition (1), namely -0.25 <∆/S < 0; and the maximum value of the decentering amount (S) is at least 3 mm.
Inventors:
ISHIZUKA KENICHI (JP)
UEMURA KAMON (JP)
UEMURA KAMON (JP)
Application Number:
PCT/JP2014/004085
Publication Date:
February 12, 2015
Filing Date:
August 05, 2014
Export Citation:
Assignee:
RICOH OPTICAL IND CO (JP)
SONY CORP (JP)
SONY CORP (JP)
International Classes:
G02B25/00
Domestic Patent References:
| WO2010087296A1 | 2010-08-05 |
Foreign References:
| JP2002182127A | 2002-06-26 | |||
| JP2011043599A | 2011-03-03 | |||
| JP2005062213A | 2005-03-10 | |||
| JP2013045020A | 2013-03-04 |
Other References:
See also references of EP 3032313A4
Attorney, Agent or Firm:
KUDO, Shuichi et al. (JP)
Shuichi Kudo (JP)
Shuichi Kudo (JP)
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