Imaging lens, imaging device and portable terminal

• Main Authors: EIGO SANO, KIYONO TATEYAMA, MANAMI KUISEKO, MASAE SATO
• Format: Patent
• Language: Chinese; English
• Published: 18.06.2014
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

The invention provides a small imaging lens which corrects various aberrations well, is of F2.4 or less brightness and is composed of six lenses. The imaging lens is provided with a positive lens group, which is equipped with a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4) and a fifth lens (L5), and a negative sixth lens (L6) in order from an object side. The imaging lens (10) satisfies a conditional expression (1): 0.3<=f/(2*f1*Fno)<1.0 (1), wherein f is a focus distance of a whole system of the imaging lens (10), f1 is a focus distance of the first lens (L1), and Fno is an F value of the whole system of the imaging lens (10). Through the f lower than an upper limit of the conditional expression (1), a spherical aberration generated in the first lens (L1) can be suppressed to be small; and, on the other hand, through the f higher than a lower limit, the focal power of the first lens (L1) can be moderately maintained, and miniaturization of the overall length of the imaging lens (