Optical lens system
AssigneeYoung Optics Inc.
InventorChen-Cheng Liao
Life of this patent
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Abstract
An optical lens system includes a first lens element of negative refractive power having a meniscus shape, a second lens element of positive refractive power having a convex image-side surface and disposed adjacent to the first lens element, a third lens element of positive refractive power having at least one aspheric surface and disposed adjacent to the second lens element, and a fourth lens element of negative refractive power having at least one aspheric surface and disposed adjacent to the third lens element.
Claims17
An optical lens system, comprising:
- a first lens element of negative refractive power having a meniscus shape;
- a second lens element of positive refractive power having a convex image-side surface and a concave object-side surface and disposed adjacent to the first lens element, wherein the second lens is a spherical lens;
- a third lens element of positive refractive power having at least one aspheric surface and disposed adjacent to the second lens element;
- and
- a fourth lens element of negative refractive power having at least one aspheric surface and disposed adjacent to the third lens element,
- wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.
An optical lens system comprising in order from an object side to an image side:
- a first lens element having negative refractive power, wherein the first lens element has a convex object-side surface and a concave image-side surface;
- a second lens element having refractive power, wherein the second lens element has a convex object-side surface and a convex image-side surface, and an interval between the first lens element and the second lens element is smaller than or equal to 2.306 mm;
- a third lens element having refractive power and a convex image-side surface;
- and
- a fourth lens element having refractive power, wherein in at least one of the third lens element and the fourth lens element is an aspheric lens element, wherein the condition:
- 0.2<|f1/f2|<0.7 is satisfied, where f1 denotes a focal length of the first lens element and f2 denotes a focal length of the second lens element.
An optical lens system comprising in order from an object side to an image side:
- a first lens element having negative refractive power, wherein the first lens element has a convex object-side surface and a concave image-side surface;
- a second lens element having refractive power, wherein the second lens element has a convex object-side surface and a convex image-side surface, and an interval between the first lens element and the second lens element is smaller than or equal to 2.306 mm;
- a third lens element having refractive power and a convex image-side surface;
- a fourth lens element having refractive power, wherein in at least one of the third lens element and the fourth lens element is an aspheric lens element;
- and
- a lens element of negative refractive power disposed between the first and second lens elements,
- wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.
An optical lens system, comprising:
- a first lens element of negative refractive power having a meniscus shape;
- a second lens element of positive refractive power having a convex image-side surface and disposed adjacent to the first lens element, wherein the second lens is a spherical lens;
- a third lens element of positive refractive power having at least one aspheric surface and disposed adjacent to the second lens element;
- a fourth lens element of negative refractive power having at least one aspheric surface and disposed adjacent to the third lens element;
- and
- a lens element of negative refractive power disposed between the first and second lens elements,
- wherein the optical lens system has a maximum field of view in object space of at least 150 degrees.
Dependencies are inferred from the claim text.