| 摘要 |
An image pickup lens system includes, successively in order from an object side, an aperture stop, a first lens as a double-convex positive lens, and a second lens as a negative meniscus lens having a convex surface on an image side. Each of the first and second lenses has at least one aspherical surface. The image pickup lens system satisfies the following conditional formulas (1), (2), and (3): <?in-line-formulae description="In-line Formulae" end="lead"?>0.24<|f1/f2|<0.68 (1) <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.83<R1/f<3.68 (2) <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.13<D3/f<0.31 (3), where <?in-line-formulae description="In-line Formulae" end="tail"?> f1: the focal length of the first lens; f2: the focal length of the second lens; R1: the paraxial radius of curvature of the surface on the object side of the first lens; f: the focal length of the entire system; and D3: the axial surface-to-surface distance between the first lens and the second lens.
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