Patent attributes
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:1.9<|fd/f2d|<3.50.9<|fd/f3d|<2.0−2.5<(r201+r202)/(r201−r202)<−1.4−1.7<(r301+r302)/(r301−r302)<−1.0.
