| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an imaging lens which realizes high imaging performance with its total length shortened, and provide an imaging apparatus and a portable terminal equipment which are equipped with the imaging lens and can obtain an imaging signal of high resolution. <P>SOLUTION: An imaging lens comprises, in the order from an object side, a first lens G1 having a positive refractive power, a second lens G2 having a negative refractive power, a third lens G3 having a positive refractive power, and a fourth lens G4 whose object-side surface is recessed or flat in the vicinity of an optical axis and which has a negative refractive power. The following conditional expression is satisfied: 0.3<¾(R4+R3)/(R4-R3)¾<1.5......(1), where R3 represents a paraxial curvature radius of an object-side surface of the second lens G2 and R4 represents a paraxial curvature radius of an image-side surface of the second lens G2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
