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US 10,295,789 B2Granted
Four-piece optical lens system
AssigneeNewmax Technology Co., Ltd.
InventorChing-Yun Huang
Life of this patent
Estimating the term…
Abstract
A four-piece optical lens system includes, in order from the object side to the image side: a stop, a first lens element with a positive refractive power, a second lens element with a negative refractive power, a third lens element with a positive refractive power, a fourth lens element with a negative refractive power. Such arrangements not only can be applied to a portable electronic product, but also has a long focal length, high pixel and low height.
Claims14
a four-piece optical lens system, in order from an object side to an image side, comprising:
- a stop;
- a first lens element with a positive fractive power, having an object-side surface being convex near an optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the first lens element being aspheric;
- a second lens element with a negative refractive power, having an object-side surface being convex near the optical axis and an image side surface being concave near the optical axis, at least one of the object-side surface and the image-side surface of the second lens element being aspheric;
- a third lens element with a positive refractive power, having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the third lens element being aspheric and
- a fourth lens element with a negative refractive power, having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis, at least one of the object-side surface and the image-side surface of the fourth lens element being aspheric;
- wherein, a focal length of the first lens element is f1, a focal length of the fourth lens element is f4, and they satisfy the relation:
- −0.64≤f1/f4≤−0.60.
4 more elements
Dependencies are inferred from the claim text.