Patent ID: 6038082
Filing Date: 2000-03-14
Classification: G02B

Abstract:
A wide-angle zoom lens comprising, successively from an object side, a first lens group having a positive refracting power, a second lens group having a negative refracting power, a third lens group having a negative refracting power, and a fourth lens group having a positive refracting power; wherein, when changing power from a wide-angle end to a telephoto end, said second and third lens groups move on an optical axis, while said first and fourth lens groups are fixed with respect to an image face; andwherein said first lens group comprises, successively from the object side, a first lens made of a concave meniscus lens having a convex face directed onto the object side, a second lens made of a biconcave lens, a third lens made of a biconvex lens, fourth and fifth lenses constituting a cemented lens made of concave and convex lenses, and a sixth lens made of a convex meniscus lens having a convex face directed onto the object side.