Patent ID: 6618197
Filing Date: 2003-09-09
Classification: G02B

Abstract:
An image stabilizing optical objective lens system comprising, in the order from the side of the system closest to an object, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, wherein said second lens unit is moved in the direction of the optical axis of the system for focusing and said fourth lens unit is moved in a direction perpendicular to the optical axis for correcting image blur, and wherein when the focal length of the entire system is normalized to 1, the following relationships hold true:âˆ’5.0<I40.7<I5<5.0 0.5I4/I5|<2.0 where I4 and I5 represent respectively the spherical aberration coefficients of said fourth and fifth lens units focused on an object at infinity.