| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an imaging lens capable of obtaining high resolution performance, an imaging apparatus, and portable terminal equipment.SOLUTION: The imaging lens comprises, in order from an object side: a first lens G1 having positive refractive power; a second lens G2 having negative refractive power; a third lens G3 having a convex surface on an image side and positive refractive power; a fourth lens G4 having positive refractive power in the vicinity of an optical axis; and a fifth lens G5 having negative refractive power in the vicinity of the optical axis. The object-side surface of the second lens G2 is concave in the vicinity of the optical axis and the image-side surface of the fifth lens G5 is concave in the vicinity of the optical axis and has an area where the negative refractive power weakens as compared with the vicinity of the optical axis toward the periphery. The imaging lens satisfies the following conditional expression: 1.0<f/f1<1.4...... (1A), where f1 is the focal length of the first lens G1 and f is the focal length of the entire system.</p> |
