Patent ID: 7489451
Filing Date: 2009-02-10
Classification: G02B

Abstract:
1. A taking lens system that images light from an object to be photographed on an image sensor, said taking lens system comprising: at least, from a side of the object to be photographed, a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power and a fourth lens unit having positive optical power, wherein zooming is performed by moving at least the first lens unit, and the following relationships are satisfied: where, “TLw” is a distance from a most object-to-be-photographed side surface of the first lens unit to an imaging surface at a wide angle end, “ft” is an overall focal length of the taking lens system at a telephoto end, “fw” is an overall focal length of the taking lens system at the wide angle end, and “fl” is a focal length of the first lens unit.