US 2026/0093093 A1Published application

Imaging optical system, image capturing unit and electronic device

AssigneeLargan Precision Co., Ltd.

InventorsYu-Chun KE, Guan-Jr LIAO

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Abstract

An imaging optical system includes six lens elements which are, 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, a fourth lens element, a fifth lens element and a sixth lens element. The second lens element has an image-side surface being concave in a paraxial region thereof. The third lens element has positive refractive power. The fourth lens element with negative refractive power has an image-side surface being convex in a paraxial region thereof. The fifth lens element with positive refractive power has an image-side surface being convex in a paraxial region thereof. The sixth lens element has an image-side surface having at least one inflection point. The imaging optical system further includes an aperture stop located between an imaged object and the second lens element.

Claims27

Dependent claims

An imaging optical system comprising six lens elements, the six 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, a fourth lens element, a fifth lens element and a sixth lens element, and each of the six lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side;

wherein the image-side surface of the second lens element is concave in a paraxial region thereof, the third lens element has positive refractive power, the fourth lens element has negative refractive power, the image-side surface of the fourth lens element is convex in a paraxial region thereof, the fifth lens element has positive refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof, the image-side surface of the sixth lens element has at least one inflection point, and the imaging optical system further comprises an aperture stop located between an imaged object and the second lens element;
and
wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the sixth lens element is f6, a curvature radius of the object-side surface of the first lens element is R1, and the following conditions are satisfied:
-
0.2
<
TL
/
f
⁢
6
<
1.5
;
and
-
1.5
<
TL
/
R
⁢
1
<
0.6
.

23 more elements

wherein the image-side surface of the first 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, the image-side surface of the fourth lens element is convex in a paraxial region thereof, the fifth lens element has positive refractive power, the image-side surface of the sixth lens element has at least one inflection point, and the imaging optical system further comprises an aperture stop located between an imaged object and the second lens element;
wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the sixth lens element is f6, a curvature radius of the object-side surface of the first lens element is R1, a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, and the following conditions are satisfied:
-
0
.
3
⁢
0
<
TL
/
f
⁢
6
;
-
1.5
<
TL
/
R
⁢
1
<
0.7
;
and
0.
<
❘
"\[LeftBracketingBar]"
R
⁢
10
/
R
⁢
9
❘
"\[RightBracketingBar]"
<
1.
.

40 more elements

wherein the image-side surface of the first 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, the third lens element has positive refractive power, the fourth lens element has negative refractive power, the image-side surface of the fourth lens element is convex in a paraxial region thereof, the fifth lens element has positive refractive power, the image-side surface of the fifth lens element is convex in a paraxial region thereof, and the image-side surface of the sixth lens element has at least one inflection point;
and
wherein an axial distance between the object-side surface of the first lens element and an image surface is TL, a focal length of the third lens element is f3, a focal length of the fifth lens element is f5, a focal length of the sixth lens element is f6, a curvature radius of the object-side surface of the first lens element is R1, and the following conditions are satisfied:
-
0
.
3
⁢
0
<
TL
/
f
⁢
6
<
1.2
;
-
1.3
<
TL
/
R
⁢
1
<
0
.60
;
and
0.35
<
❘
"\[LeftBracketingBar]"
f
⁢
3
/
f
⁢
5
❘
"\[RightBracketingBar]"
<
1.2
.

44 more elements

Dependencies are inferred from the claim text.