Patent ID: 7215481
Filing Date: 2007-05-08
Classification: G02B

Abstract:
1. A taking lens system comprising, in order from an object side thereof, a first lens group having negative refracting power, a second lens group having positive refracting power, an aperture stop and a third lens group having positive refracting power, wherein: focusing from an infinite distance to a finite distance is performed by setting said second lens group and said third lens group such that a position of said second lens group upon focusing on a finite distance is located on an image side of said taking lens system with respect to a position of said second lens group upon focusing on an infinite distance and a position of said third lens group upon focusing on a finite distance is located on an object side of said taking lens system with respect to a position of said third lens group upon focusing on an infinite distance, while said first lens group remains fixed, and wherein upon focusing from an infinite distance to a finite distance, said second lens group moves only toward the image side and said third lens group moves only toward the object side.