| 摘要 |
The object is to obtain an imaging lens system having an entire lens system downsized, being excellent in portability, and being compatible with a large number of pixels by which a favorable image quality is provided. Provided is an imaging lens system for forming an optical image of an object on a light receiving surface of a solid-state image sensor, comprising, in order from an object side, an aperture diaphragm ( 100 ), a first lens element ( 101 ) having a positive optical power and a convex surface on an image side, a second lens element ( 102 ) having a negative optical power and being a meniscus lens whose object side has a concave shape, and a third lens element ( 103 ) having a positive optical power and being a meniscus lens whose object side has a convex shape, in which the following conditional expressions are satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>1.9<|FD/F2d|<3.5 <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.9<|FD/F3d|<2.0 <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>-2.5<(r<SUB>201</SUB>+r<SUB>202</SUB>)/(r<SUB>201</SUB>-r<SUB>202</SUB>)<-1.4 <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>-1.7<(r<SUB>301</SUB>+r<SUB>302</SUB>)/(r<SUB>301</SUB>-r<SUB>302</SUB>)<-1.0 <?in-line-formulae description="In-line Formulae" end="tail"?>
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