Title:
TELECONVERTER LENS AND OPTICAL APPARATUS
Document Type and Number:
WIPO Patent Application WO/2017/134928
Kind Code:
A1
Abstract:
A teleconverter lens of the disclosure of the present invention has, overall, a negative refractive power, and comprises the following, in order from the object side to the image side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. The first lens group and the third lens group each include a positive lens and are formed of no more than two lenses. The teleconverter lens is detachably attached to a master lens on the image side thereof, and thereby enlarge the focal length of the master lens.
Inventors:
CHEN YONGHUA (JP)
MIYAGAWA NAOKI (JP)
MIYAGAWA NAOKI (JP)
Application Number:
PCT/JP2016/086673
Publication Date:
August 10, 2017
Filing Date:
December 09, 2016
Export Citation:
Assignee:
SONY CORP (JP)
International Classes:
G02B15/12; G02B13/18; G02B15/20
Foreign References:
| JPH05142473A | 1993-06-11 | |||
| JP2014115410A | 2014-06-26 | |||
| JP2005107261A | 2005-04-21 | |||
| JP2002267929A | 2002-09-18 | |||
| JP2008107448A | 2008-05-08 | |||
| JP2002287026A | 2002-10-03 | |||
| JPH01205117A | 1989-08-17 | |||
| JP2016191761A | 2016-11-10 |
Attorney, Agent or Firm:
TSUBASA PATENT PROFESSIONAL CORPORATION (JP)
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