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US 2020/0026032 A1Published application
Lens system, projection device, detecting module and electronic device
AssigneeLargan Precision Co., Ltd.
InventorsChun-Yen CHEN, Shu-Yun YANG
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Abstract
An electronic device includes a lens system including four lens elements. the four lens elements 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 second lens element has negative refractive power. The fourth lens element has positive refractive power. At least one surface of the four lens elements has at least one inflection point. A projection device and a detecting module of the electronic device including the lens system are also disclosed.
Claims31
An electronic device comprising:
- a lens system comprising 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;
- wherein the first lens element has an outer-side surface being convex in a paraxial region thereof, the second lens element with negative refractive power has an outer-side surface being convex in a paraxial region thereof and an inner-side surface being concave in a paraxial region thereof, and each of at least two lens elements of the lens system has an Abbe number smaller than 22.0;
- wherein a maximum effective radius of an inner-side surface of the fourth lens element is Y42, an entrance pupil diameter of the lens system is EPD, an Abbe number of the i-th lens element is Vdi, and the following conditions are satisfied:
- 0.10<(Y42×2)/EPD<1.20;
- and
- 40.0<ΣVdi<150.0, wherein i=1,2,3,4.
3 more elements
An electronic device comprising:
- a lens system comprising 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;
- wherein the second lens element has an outer-side surface being convex in a paraxial region thereof, each of at least two lens elements of the lens system has an Abbe number smaller than 22.0, and the lens system further comprises an aperture stop disposed on the outer side of the second lens element;
- wherein a maximum effective radius of an inner-side surface of the fourth lens element is Y42, an entrance pupil diameter of the lens system is EPD, an Abbe number of the i-th lens element is Vdi, and the following conditions are satisfied:
- 0.10<(Y42×2)/EPD<1.20;
- and
- 86.7≤ΣVdi<150.0, wherein i=1,2,3,4.
3 more elements
An electronic device comprising:
- a lens system comprising 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;
- wherein the third lens element with negative refractive power has an outer-side surface being concave in a paraxial region thereof and an inner-side surface being convex in a paraxial region thereof, and each of at least two lens elements of the lens system has an Abbe number smaller than 22.0;
- wherein a maximum effective radius of an inner-side surface of the fourth lens element is Y42, an entrance pupil diameter of the lens system is EPD, and the following condition is satisfied:
- 0.10<(Y42×2)/EPD<1.20.
1 more element
An electronic device comprising:
- a lens system comprising 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;
- wherein the first lens element has positive refractive power, at least one surface of the second lens element is aspheric, the third lens element with negative refractive power has an outer-side surface being concave in a paraxial region thereof and an inner-side surface being convex in a paraxial region thereof, the fourth lens element has positive refractive power, at least one surface of the fourth lens element is aspheric, each of at least half of lens elements of the lens system is made of plastic material, and each of at least two lens elements of the lens system has an Abbe number smaller than 22.0.
An electronic device comprising:
- a lens system comprising 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;
- wherein the first lens element has positive refractive power, the second lens element has negative refractive power, the third lens element with negative refractive power has an outer-side surface being concave in a paraxial region thereof and an inner-side surface being convex in a paraxial region thereof, the fourth lens element has positive refractive power, each of at least two lens elements of the lens system has an Abbe number smaller than 22.0, and the lens system further comprises an aperture stop disposed on the outer side of the second lens element.
Dependencies are inferred from the claim text.