Title:
ズームレンズ，撮像光学装置及びデジタル機器
Document Type and Number:
Japanese Patent JP5609994
Kind Code:
B2
Abstract:
A positive-negative-positive-positive-positive zoom lens changes magnification by moving each of a first group to a fourth group so as to alter the interval between each group. The third group comprises first and second lens components, at least one of which has an aspheric surface, and the first lens component is a positive-negative-positive cemented lens in sequence from the object side. The zoom lens satisfies the conditional expressions, 7<β2t/β2w<10, 5<β3t/β3w<12, 0.7<(β2t/β2w)/(β3t/β3w)<1.65) (where: β2t is the lateral magnification of the second group at the telephoto end; β2w is the lateral magnification of the second group at the wide end; β3t is the lateral magnification of the third group at the telephoto end; and β3w is the lateral magnification of the third group at the wide end).
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Inventors:
山本 康
Application Number:
JP2012554725A
Publication Date:
October 22, 2014
Filing Date:
January 16, 2012
Export Citation:
Assignee:
コニカミノルタ株式会社
International Classes:
G02B15/20; G02B13/18
Domestic Patent References:
| JP2007256604A | 2007-10-04 | |||
| JP2006184416A | 2006-07-13 | |||
| JP2005308998A | 2005-11-04 | |||
| JP2009128607A | 2009-06-11 | |||
| JP2007256604A | 2007-10-04 | |||
| JP2006184416A | 2006-07-13 | |||
| JP2005308998A | 2005-11-04 | |||
| JP2009128607A | 2009-06-11 |
Attorney, Agent or Firm:
Patent business corporation Sano patent firm
Shizuo Sano
Atsushi Inoue
Shizuo Sano
Atsushi Inoue