Patent ID: 6452729
Filing Date: 2002-09-17
Classification: G02B

Abstract:
An optical device comprising:a zoom lens system, comprising a plurality of lens units, which achieves zooming by varying unit-to-unit distances; and an image sensor for converting an optical image formed by the zoom lens system into an electrical signal, wherein the zoom lens system comprises at least, from an object side thereof to an image side thereof, a first lens unit having a negative optical power and a second lens unit having a positive optical power, and the following conditional formulae are fulfilled: 21/fw|<4 0.0582Ã—fw/TLw<0.9 â€ƒwhere f1 represents a focal length of the first lens unit; fw represents a focal length of an entire optical system at a wide-angle end; tan &ohgr;w represents a half view angle at a wide-angle end and TLw represents a distance from a first vertex to an image plane at the wide-angle end.