US 9,310,582 B2 · Image pick-up lens, image pick-up device, portable terminal and digital instrument

Abstract

Provided is an image pickup lens that despite being small is favorably corrected for aberrations and has a five element configuration that is wide angle and has a bright F-number also provided is an image pickup device and a portable terminal using the image pickup lens. The image surface side of the fifth lens has an aspherical shape, has an inflection point at a position other than a position that intersects with the light axis, and satisfies the following formulae: −5.0<(r1+r2)/(r1−r2)≦−1.0 (1); 0.90<f1/f<1.70 (2); 0.35<ΣDL13/f<0.55 (3). Provided that r1: curvature radius of the first lens object side surface, r2: curvature radius of the first lens image side surface, f1: focal distance of the first lens, f: focal distance of the entire image pickup lens system, ΣDL13: distance on the optical axis from object side surface of the first lens to image side surface of the third lens.

Claims22

Dependent claims

An image pickup lens to form an image of an object onto a photoelectric conversion section, comprising, in the order from an object side thereof:

a first lens which has a positive refractive power and includes a convex surface facing the object side;
a second lens which has a negative refractive power;
a third lens which includes an aspheric configuration on at least one surface thereof;
a fourth lens which has a positive refractive power and includes a convex surface facing an image side;
and
a fifth lens which has a negative refractive power and includes a biconcave configuration, wherein an image-side surface of the fifth lens includes an aspheric configuration and has an inflection point at a position other than an intersection point with an optical axis,
wherein the following conditional expressions are satisfied:
−5.0<(r1+r2)/(r1−r2)≦−1.0 (1)
0.90<f1/f<1.70 (2)
0.35<ΣDL13/f<0.55 (3)
wherein in the above expressions:
r1 is a radius of curvature of an object side surface of the first lens,
r2 is a radius of curvature of an image side surface of the first lens,
f1 is a focal length of the first lens,
f is a focal length of the whole system of the image pickup lens, and
ΣDL13 is a distance on the optical axis from the object side surface of the first lens to the image side surface of the third lens.

13 more elements

Dependencies are inferred from the claim text.

Image pick-up lens, image pick-up device, portable terminal and digital instrument

Life of this patent

Image pick-up lens, image pick-up device, portable terminal and digital instrument

Life of this patent

Abstract

Claims22