Patent ID: 7619831
Filing Date: 2009-11-17
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from a magnifying side, a first lens group having a negative refractive power as a whole, a second lens group having a positive refractive power as a whole, and a cover glass, wherein: changing the magnification of a whole lens system thereof is attained by configuring such that while a magnification varying operation is in effect, the first lens group is made to move on an optical axis in such a manner as to move in a direction from a magnifying side to a contracting side over a range from a wide angle end to an intermediate area and to move in a direction from the contracting side to the magnifying side over a range from the intermediate area to a telephoto end, and the second lens group is made to move on the optical axis in such a manner as to move in a direction from the contracting side to the magnifying side over a range from the wide angle end to the telephoto end, and wherein, the following conditional expression (1) is satisfied with respect to a power set at the first lens group, the following conditional expression (2) is satisfied with respect to a power set at the second lens group, and the following conditional expression (3) is satisfied with respect to an airspace set on a contracting side of the second lens group at the wide angle end; where f f f d