Title:
ZOOM LENS, OPTICAL IMAGING EQUIPMENT AND DIGITAL DEVICE
Document Type and Number:
WIPO Patent Application WO/2012/102105
Kind Code:
A1
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).
Inventors:
YAMAMOTO YASUSHI (JP)
Application Number:
PCT/JP2012/050663
Publication Date:
August 02, 2012
Filing Date:
January 16, 2012
Export Citation:
Assignee:
KONICA MINOLTA OPTO INC (JP)
YAMAMOTO YASUSHI (JP)
YAMAMOTO YASUSHI (JP)
International Classes:
G02B15/20; G02B13/18
Foreign References:
| JP2007256604A | 2007-10-04 | |||
| JP2006184416A | 2006-07-13 | |||
| JP2005308998A | 2005-11-04 |
Attorney, Agent or Firm:
SANO SHIZUO (JP)
Shizuo Sano (JP)
Shizuo Sano (JP)
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Claims: