Patent ID: 7248293

Claim:
An image-sensing apparatus comprising: a zoom lens system for forming an optical image of an object with variable magnification, the zoom lens system including a plurality of lens units and achieving zooming by varying distances between the lens units; and an image sensor for converting the optical image formed by the zoom lens system into an electrical signal, wherein the zoom lens system comprises, from an object side thereof: a first lens unit having a positive optical power and including a reflective member for turning an optical path, the first lens unit being kept stationary relative to the image sensor during zooming; a second lens unit disposed on an image side of the first lens unit and having a negative optical power, the second lens unit being moved relative to the image sensor during zooming; a third lens unit disposed on an image side of the second lens unit and having a positive optical power, the third lens unit being moved relative to the image sensor during zooming; and a fourth lens unit disposed on an image side of the third lens unit and having a positive optical power, wherein the zoom lens system fulfills the following conditions: 1.0 <D/fW< 3.0; and −8 <fa/fW<− 3 where D represents an axial distance from a most object-side surface of the first lens unit to the reflective surface of the reflective member; fa represents a composite focal length of all optical elements disposed on an object side of the reflective member within the first lens unit; and fW represents a focal length of the zoom lens system as a whole at an wide-angle end.