Imaging lens
AssigneesAAC Technologies Japan R&D Center, Aac Acoustic Technologies (Shenzhen) Co., Ltd.
InventorHiroyuki Teraoka
Life of this patent
Estimating the term…
Abstract
An imaging lens includes, from an object-side to an image-side: a first lens of positive refractive power with a convex surface on the object-side, an aperture stop, a second lens of negative refractive power with a convex surface on the image-side and a meniscus shape, a third lens of positive refractive power with a convex surface on the object-side and a meniscus shape. Specified conditions are satisfied in order to enhance a high brightness and reduce aberrations.
Claims4
An imaging lens, in the order from the object-side to the image-side of the imaging lens, comprising:
- a first lens of positive refraction power, with a convex surface on the object-side;
- an aperture stop, wherein the aperture stop is installed between the first lens and the second lens;
- a second lens of negative refraction power, with a convex surface on the image-side;
- a third lens of positive refraction power, with a convex surface on the object-side;
- wherein the imaging lens satisfies the following conditions:
- 0.80≦f1/f≦0.87;
- −2.00≦f2/f≦−0.90;
- 0.35≦R3/R4≦0.65;
- 0.01≦d2/d3≦0.15;
- and 0.08≦d5/f≦0.18;
- Wherein:
- F is a focal length of the imaging lens;
- f1 is a focal length of the first lens;
- f2 is a focal length of the second lens;
- R3 is a radius of curvature of the object-side surface of the second lens;
- R4 is a radius of curvature of the image-side surface of the second lens;
- d2 is a distance between the image-side surface of the first lens and the aperture stop on the optical axis of imaging lens;
- d3 is a distance between the aperture stop and the object-side surface of the second lens on the optical axis of imaging lens;
- d5 is distance between the image-side surface of the second lens and the object-side surface of the third lens on the optical axis of imaging lens.
Dependencies are inferred from the claim text.