Patent ID: 6046852
Filing Date: 2000-04-04
Classification: G02B

Abstract:
An optical lens comprising:a movable lens unit movable in a direction perpendicular to an optical axis of the optical lens system to correct an image blur resulting from vibration of the optical lens system, the movable lens unit having a first lens element disposed at an image-side end thereof; anda fixed lens unit fixed in a direction perpendicular to the optical axis of the optical lens system to correct image blur and next to the movable lens unit, the fixed lens unit having a second lens element disposed at an object-side end thereof,wherein each of the first and second lens elements have an object-side surface and an image-side surface bordering air,wherein said first and second lens elements satisfy the following conditions:-5<SL2/SL1<0;1.0<SL1;PL2/PL1 <0;whereSL1: shape factor of the first lens element;SL2: shape factor of the second lens element;PL1: refractive power of the first lens element;PL2: refractive power of the second lens element; and the shape factors SL1 and SL2 are defined as follows:SL1=(CRR.sub.L1 +CRF.sub.L1)/(CRR.sub.L1 -CRF.sub.L1);SL2=(CRR.sub.L2 +CRF.sub.L2)/(CRR.sub.L2 -CRF.sub.L2);whereCRR.sub.L1 : radius of curvature of an image-side surface of the first lens element;CRR.sub.L1 : radius of curvature of an object-side surface of the first lens element;CRR.sub.L2 radius of curvature of an image-side surface of the first lens element;CRRL.sub.2 : radius of curvature of an object-side surface of the first lens element.