Title:
ズームレンズ及びそれを用いた電子撮像装置
Document Type and Number:
Japanese Patent JP4097931
Kind Code:
B2
Abstract:
A zoom lens comprises a first lens group G1 of negative refractive power, a second lens group G2 of positive refractive power and a third lens group G3 of positive refractive power. Upon zooming from the wide-angle end to the telephoto end of the zoom lens, the second lens group G2 moves toward the object side alone of the zoom lens, and the third lens group G3 moves while the spacing between the third lens group G3 and the second lens group G2 varies. The second lens group G2 is composed of a front subgroup and a rear subgroup. The front subgroup is composed of a doublet component consisting of, in order from its object side, a positive lens element having an aspheric surface and a negative lens element, and the rear subgroup is composed of one positive lens component.
Inventors:
Shinichi Mihara
Application Number:
JP2001351624A
Publication Date:
June 11, 2008
Filing Date:
November 16, 2001
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B5/20; G02B15/20; G02B5/22; G02B5/26; G02B13/18; G02B15/177; H04N5/225; H04N101/00
Domestic Patent References:
| JP2001272602A | ||||
| JP2001296475A |
Attorney, Agent or Firm:
Hiroshi Nagisawa
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Kenji Aoki
Akira Yonezawa
Ryukichi Abe
Hirukawa Masanobu
Norihiko Uchida
Hideo Sugai
Kenji Aoki
Akira Yonezawa