Title:
ズームレンズおよびカメラおよび携帯情報端末装置
Document Type and Number:
Japanese Patent JP5206174
Kind Code:
B2
Abstract:
A zoom lens unit including, in order from an object side to an image surface side: a first lens group (I) having a positive refracting power; a second lens group (II) having a negative refracting power; a third lens group (III) having a positive refracting power; and a fourth lens group (IV) having a positive refracting power, wherein when changing magnification from a wide-angle end to a telephoto end, an interval between the first lens group (I) and the second lens group (II) increases, an interval between the second lens group (II) and the third lens group (III) decreases, and an interval between the third lens group (III) and the fourth lens group (IV) increases, wherein when performing focusing on a close range object at least at the telephoto end, with reference to a focused state on an infinite object, the first lens group (I) and the second lens group (II) are fixed, the third lens group (III) is capable of being moved to the image surface side, and the fourth lens group (IV) is capable of being moved to the object side.
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Inventors:
Kazuyasu Ohashi
Application Number:
JP2008178381A
Publication Date:
June 12, 2013
Filing Date:
July 08, 2008
Export Citation:
Assignee:
株式会社リコー
International Classes:
G02B15/20; G02B7/105; G02B13/18
Domestic Patent References:
| JP61236516A | ||||
| JP4208911A | ||||
| JP2008076493A |
Attorney, Agent or Firm:
Shogo Honda
Toru Kabayama
Toru Kabayama