Optical lens system for taking image
AssigneeLargan Precision Co., Ltd.
InventorTsung-Han Tsai
Life of this patent
Estimating the term…
Abstract
An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power; a second lens element with negative refractive power; a third lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a fourth lens element with negative refractive power being provided with at least one aspheric surface. In the optical lens system for taking image, the number of lens elements with refractive power is limited to four. Such arrangements can reduce the volume and the sensitivity of the optical lens system while providing higher resolution.
Claims25
An optical lens system for taking image comprising, in order from the object side to the image side:
- a first lens element with positive refractive power;
- a second lens element with negative refractive power;
- a third lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
- and
- a fourth lens element with negative refractive power being provided with at least one aspheric surface, in the optical lens system for taking image, the number of lens elements with refractive power being limited to four.
An optical lens system for taking image comprising, in order from the object side to the image side:
- a first lens element with positive refractive power having a convex object-side surface;
- a second lens element with negative refractive power having a concave object-side surface and a convex image-side surface, the second lens element being provided with at least one aspheric surface;
- a plastic third lens element with negative refractive power having a convex object-side surface and a concave image-side surface, the object-side surface and the image-side surface of the third lens element being aspheric;
- and
- a plastic fourth lens element with negative refractive power having a concave image-side surface, an object-side surface and the image-side surface of the fourth lens element being aspheric, inflection points being formed on the fourth lens element, in the optical lens system for taking image, the number of lens elements with refractive power being limited to four.
Dependencies are inferred from the claim text.