Imaging lens module

摘要

An imaging lens module includes first, second and third optical lenses that are arranged sequentially from an object side to an image side along an optical axis, and a constant-aperture diaphragm disposed between the first and second optical lenses. The first optical lens has a positive refractive power, and the second optical lens has a negative refractive power. The third optical lens has a positive refractive power and has an object-side surface and an image-side surface, At least one of which has at least an inflection point. The imaging lens module satisfies: 0.8TL/Dg1.1, in which, TL is a length from an imaging plane to the object-side surface of the first optical lens, and Dg is a length of a diagonal line of a maximum viewing angle on the imaging plane.

主权项

1. An imaging lens module comprising:
an optical lens set including first, second and third optical lenses that are arranged sequentially from an object side to an image side along an optical axis of said imaging lens module,
said first optical lens having a positive refractive power near the optical axis, said first optical lens having a convex object-side surface near the optical axis that faces the object side, and an image-side surface that faces the image side and that has a concave surface segment near the optical axis, wherein at least one of said object-side surface and said image-side surface of said first optical lens is aspheric,said second optical lens having a negative refractive power near the optical axis, said second optical lens having an object-side surface that faces the object side and that has a concave surface segment near the optical axis, and a convex image-side surface near the optical axis that faces the image side, wherein at least one of said object-side surface and said image-side surface of said second optical lens is aspheric,said third optical lens having a positive refractive power near the optical axis, and having an aspheric object-side surface that faces the object side, an asperhic image-side surface that faces the image side, and a peripheral surface that interconnects said object-side surface and said image-side surface, at least one of said object-side surface and said image-side surface of said third optical lens having at least one inflection point between the optical axis and said peripheral surface; and a constant-aperture diaphragm disposed between said first optical lens and said second optical lens; wherein said imaging lens module satisfies the following optical conditions:
0.8