Title:
ズームレンズ及びプロジェクタ装置
Document Type and Number:
Japanese Patent JP4561707
Kind Code:
B2
Abstract:
A zoom lens includes a first lens group having positive or negative refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power. A variable power is set such that the first and fourth lens group are left fixed, the second lens group is made to move from a magnifying side to a contracting side over a range from a wide angle end to an intermediate area and is made to move on an optical axis from the contracting side to the magnifying side over a range from the intermediate area to a telephoto end, and the third lens group is made to move on the optical axis from the contracting side to the magnifying side over a range from the wide angle end to the telephoto end.
Inventors:
Etsuro Kawakami
Yasuyuki Teshima
Yasuyuki Teshima
Application Number:
JP2006201342A
Publication Date:
October 13, 2010
Filing Date:
July 24, 2006
Export Citation:
Assignee:
CASIO COMPUTER CO.,LTD.
International Classes:
G02B15/167; G02B13/18
Domestic Patent References:
| JP62075509A | ||||
| JP63287810A |