| 摘要 |
PROBLEM TO BE SOLVED: To provide an extremely small imaging lens having a satisfactory optical performance capable of coping with high pixel imaging element even though the lens is composed of fewer lenses (two lenses), and to provide an imaging apparatus using the imaging lens. SOLUTION: The imaging lens includes in order from the object side: a first lens G1 having a positive refracting power, which has a meniscus shape whose convex face is in the direction of the object; an aperture diaphragm IR; and a second lens G2 having a positive refracting power, which has a meniscus shape whose convex face is in the direction of an image. The imaging lens satisfies the following conditional formulas (1), (2) and (3): (1) 0.2<f/f1<1.0, (2) 1.05<L/f<1.38, (3) n(ave)>1.7, wherein f denotes the focal distance of the entire lens system, f1 denotes the focal distance of the first lens, and L denotes a distance from the image side face of the first lens and an image plane (a back insertion glass is calculated using thickness acquired by air conversion), and n(ave) is the average value of refractive indexes on the d-line of the two lenses composing the lens system. COPYRIGHT: (C)2006,JPO&NCIPI
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