Optical lens
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical Co., Inc.
InventorAn-Kai Chang
Life of this patent
Estimating the term…
Abstract
An optical lens includes a first lens, a second lens and a third lens in an order from an object side to an image side along an optical axis. The first lens is a lens having negative refractive power, and an object-side surface of the first lens is concave; the second lens is a lens having positive refractive power, and an image-side surface of the second lens is convex; the third lens is a lens having positive refractive power, and an image-side surface of the third lens is convex. The optical lens satisfies a condition. i.e., 3<D1/f<6, wherein D1 is an optical effective diameter of the first lens and f is effective focal length of the optical lens. The optical lens is characterized by wide-angle and short distance.
Claims20
An optical lens comprising, in an order from an object side to an image side along an optical axis:
- a first lens, which is a lens having negative refractive power, in which an object-side surface of the first lens is concave;
- a second lens, which is a lens having positive refractive power;
- and
- a third lens, which is a lens having positive refractive power, in which an image-side surface of the third lens is convex,
- wherein the optical lens satisfies the following condition:
- 4<TTL/f<7,
- wherein TTL is the total length of the optical lens and f is effective focal length of the optical lens,
- wherein the optical lens further comprises an aperture stop disposed between the second lens and the third lens, wherein the optical lens satisfies the following condition:
- 0.5<SD/T1<1,
- wherein SD is a distance, along the optical axis, between the aperture stop and the image-side surface of the third lens, and T1 is central thickness of the first lens along the optical axis.
An optical lens comprising, in an order from an object side to an image side along an optical axis:
- a first lens, which is a lens having negative refractive power, in which an object-side surface of the first lens is concave;
- a second lens, which is a lens having positive refractive power, in which an image-side surface of the second lens is convex;
- and
- a third lens, which is a lens having positive refractive power, in which an image-side surface of the third lens is convex,
- wherein the optical lens satisfies the following condition:
- 3<D1/f<6,
- wherein D1 is a larger one of optical effective diameters of the object-side surface and the image-side surface of the first lens and f is effective focal length of the optical lens,
- wherein the optical lens satisfies the following condition:
- 4<f/TC23<6,
- wherein f is the effective focal length of the optical lens, and TC23 is a distance, along the optical axis, between the image-side surface of the second lens and an object-side surface of the third lens.
An optical lens comprising, in an order from an object side to an image side along an optical axis:
- a first lens, which is a lens having negative refractive power, in which an object-side surface of the first lens is concave;
- a second lens, which is a lens having positive refractive power, in which an image-side surface of the second lens is convex;
- and
- a third lens, which is a lens having positive refractive power, in which an image-side surface of the third lens is convex,
- wherein the optical lens satisfies the following condition:
- 0.7<OD/TTL<1.2,
- wherein OD is a distance, along the optical axis, between the object-side surface of the first lens and a to-be-detected object, and TTL is the total length of the optical lens.
Dependencies are inferred from the claim text.