Imaging system lens assembly, image capturing unit and electronic device
AssigneeLargan Precision Co., Ltd.
InventorsKuan-Ting YEH, Cheng-Yu TSAI
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Abstract
An imaging system lens assembly includes, in order from an object side to an image side: a first lens element, a second lens element, a third lens element and a fourth lens element. Each of the four lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The second lens element has positive refractive power. The object-side surface of the third lens element is convex in a paraxial region thereof.
Claims22
An imaging system lens assembly comprising four lens elements, the four lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element and a fourth lens element, and each of the four lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
- wherein the first lens element has positive refractive power, the second lens element has positive refractive power, and the image-side surface of the fourth lens element is concave in a paraxial region thereof;
- wherein the imaging system lens assembly further comprises an aperture stop disposed between an imaged object and the second lens element;
- wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, an axial distance between the image-side surface of the fourth lens element and an image surface is BL, an Abbe number of the first lens element is V1, an Abbe number of the third lens element is V3, and the following conditions are satisfied:
- 0
- <
- TD
- /
- BL
- <
- 0.42
- ;
- and
- 20.
- <
- V
-
- 1
- -
- V
-
- 3
- <
- 3
-
- 9
- .
- 0
- .
An imaging system lens assembly comprising four lens elements, the four lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element and a fourth lens element, and each of the four lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;
- wherein the first lens element has positive refractive power, the second lens element has positive refractive power, the object-side surface of the second lens element is convex in a paraxial region thereof, the image-side surface of the second lens element is concave in a paraxial region thereof, and the third lens element has negative refractive power;
- wherein an axial distance between the object-side surface of the first lens element and the image-side surface of the fourth lens element is TD, an axial distance between the image-side surface of the fourth lens element and an image surface is BL, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a curvature radius of the object-side surface of the third lens element is R5, a curvature radius of the object-side surface of the fourth lens element is R7, an axial distance between the object-side surface of the first lens element and the image surface is TL, a maximum image height of the imaging system lens assembly is ImgH, and the following conditions are satisfied:
- 0
- <
- TD
- /
- BL
- <
- 0.42
- ;
- 0.9
- <
- f
-
- 1
- /
- f
-
- 2
- <
- 5.
- ;
- -
- 5.5
- <
- (
- R
-
- 5
- +
- R
-
- 7
- )
- /
- (
- R
-
- 5
- -
- R
-
- 7
- )
- <
- 2.
- ;
- and
- 4.5
- <
- TL
- /
- ImgH
- <
- 15.
Dependencies are inferred from the claim text.