Electronic device
AssigneeLargan Precision Co., Ltd.
InventorsYu Jui Lin, Wei-Yu Chen
Life of this patent
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Abstract
An electronic device includes an optical lens assembly. The optical lens assembly includes four lens elements which are, in order from an outer side to an inner side: a first lens element, a second lens element, a third lens element and a fourth lens element. The first lens element has negative refractive power. An outer-side surface of the first lens element is concave in a paraxial region thereof and has at least one convex critical point in an off-axis region thereof. The third lens element has positive refractive power. The fourth lens element has an inner-side surface being convex in a paraxial region thereof and having at least one concave critical point in an off-axis region thereof. The optical lens assembly has a total of four lens elements.
Claims23
An electronic device comprising:
- an optical lens assembly comprising four lens elements, the four lens elements being, in order from an outer side to an inner side, a first lens element, a second lens element, a third lens element and a fourth lens element;
- wherein the first lens element has negative refractive power, an outer-side surface of the first lens element is concave in a paraxial region thereof and has at least one convex critical point in an off-axis region thereof, the second lens element has an outer-side surface being concave in a paraxial region thereof, the third lens element has positive refractive power, the fourth lens element has an inner-side surface being convex in a paraxial region thereof and having at least one concave critical point in an off-axis region thereof, and the optical lens assembly has a total of four lens elements;
- wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a maximum effective radius of the outer-side surface of the first lens element is Y11, a maximum effective radius of the inner-side surface of the fourth lens element is Y42, and the following conditions are satisfied:
- CT1/CT2<0.75;
- 1.75<T12/(T23+T34);
- and
- 1.0<Y42/Y11<2.0.
An electronic device comprising:
- an optical lens assembly comprising four lens elements, the four lens elements being, in order from an outer side to an inner side, a first lens element, a second lens element, a third lens element and a fourth lens element;
- wherein the first lens element has negative refractive power, an outer-side surface of the first lens element is concave in a paraxial region thereof and has at least one convex critical point in an off-axis region thereof, the second lens element has an outer-side surface being concave in a paraxial region thereof, the third lens element has positive refractive power, the fourth lens element has an inner-side surface being convex in a paraxial region thereof and having at least one concave critical point in an off-axis region thereof, and the optical lens assembly has a total of four lens elements;
- wherein a central thickness of the first lens element is CT1, a central thickness of the second lens element is CT2, an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, a curvature radius of the outer-side surface of the first lens element is R1, a curvature radius of an inner-side surface of the first lens element is R2, a maximum effective radius of the outer-side surface of the first lens element is Y11, a maximum effective radius of the inner-side surface of the fourth lens element is Y42, and the following conditions are satisfied:
- CT1/CT2<0.75;
- 0.80<T12/(T23+T34);
- (R1+R2)/(R1−R2)<0.70;
- and
- 1.0<Y42/Y11<2.0.
Dependencies are inferred from the claim text.