Optical imaging system
By designing a slim optical imaging system with a narrow viewing angle, the problem of difficult installation of high-resolution camera modules in portable terminals is solved, achieving compact and efficient imaging effects.
Patent Information
- Application Number
- CN202211183904.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2019-08-01
- Filing Date
- 2019-09-04
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2039-09-04
AI Technical Summary
It is difficult to install high-resolution and high-performance camera modules in portable terminals, especially because the focal length and total optical length of telephoto lenses are long, making it difficult to install due to space limitations.
A slim optical imaging system with a narrow viewing angle is designed, including a first lens, a second lens, a third lens, and a fourth lens arranged in sequence along the optical axis. The lens combination satisfies a specific focal length and effective semi-aperture ratio to optimize the system's compactness and imaging performance.
This enables the installation of high-resolution and high-performance camera modules with narrow viewing angles in portable terminals, solving the problem of space limitations while maintaining imaging quality.
Smart Images
Figure CN116299958B_ABST
Abstract
Claims
1. An optical imaging system, comprising: The first lens has positive refractive power, a convex object-side surface and a convex image-side surface; The second lens has negative refractive power, a convex object-side surface and a concave image-side surface; The third lens has positive refractive power; as well as The fourth lens has positive refractive power. Wherein, the first lens to the fourth lens are arranged in sequence from the object side along the optical axis of the optical imaging system, Wherein, the optical imaging system has a total of four lenses, wherein 1.3 < TTL / BFL < 3.3 is satisfied, wherein TTL is the distance from the object-side surface of the first lens to the imaging surface on the optical axis, and BFL is the distance from the image-side surface of the fourth lens to the imaging surface on the optical axis, and Wherein, f / IMG HT > 4.9 is satisfied, wherein f is the total focal length of the optical imaging system, and IMG HT is half of the diagonal length of the imaging surface.
2. The optical imaging system according to claim 1, wherein: 0.8 < TTL / f < 1.2 is satisfied.
3. The optical imaging system according to claim 1, wherein: 3.8<f / TD12<7 is satisfied, where TD12 is the distance from the object-side surface of the first lens to the image-side surface of the second lens on the optical axis.
4. The optical imaging system according to claim 1, wherein: 0.75 < f12 / f < 4.5 is satisfied, where f12 is the combined focal length of the first lens and the second lens.
5. The optical imaging system according to claim 1, wherein: The effective semi-aperture of the object-side surface of the first lens and the effective semi-aperture of the object-side surface of the second lens are both larger than the effective semi-aperture of the object-side surface and the effective semi-aperture of the image-side surface of each of the lenses other than the first lens and the second lens.
6. The optical imaging system according to claim 1, wherein: ER11 / ER_max>1.1, where ER11 is the effective semi-aperture on the object-side surface of the first lens, and ER_max is the maximum value of the effective semi-aperture on the object-side surface and the effective semi-aperture on the image-side surface of each of the lenses other than the first lens and the second lens.
7. The optical imaging system according to claim 6, wherein: ER11 / ER51 > 1.1, where ER51 is the effective semi-aperture of the object-side surface of the lens closest to the imaging surface.
8. The optical imaging system according to claim 1, wherein: ER21 / ER_max>1.0, where ER21 is the effective semi-aperture on the object-side surface of the second lens, and ER_max is the maximum value of the effective semi-aperture on the object-side surface and the effective semi-aperture on the image-side surface of each of the lenses other than the first lens and the second lens.
9. The optical imaging system according to claim 8, wherein: ER21 / ER51 > 1.0, where ER51 is the effective semi-aperture of the object-side surface of the lens closest to the imaging surface.
10. The optical imaging system according to claim 1, wherein: The focal length of the first lens is less than half of the total focal length, and the focal length of the first lens is greater than an absolute value of the focal length of the second lens.
11. The optical imaging system according to claim 1 , wherein: The third lens has a convex object-side surface.
12. The optical imaging system according to claim 11, wherein: The fourth lens element has a convex object-side surface and a concave image-side surface.
13. The optical imaging system according to claim 1, wherein: At least one of the first lens and the second lens has a non-circular shape when viewed in the optical axis direction.
14. The optical imaging system according to claim 13, wherein: The at least one of the first lens and the second lens having a non-circular shape includes a first edge and a second edge having an arc shape, and a third edge and a fourth edge connecting the first edge and the second edge to each other, and a length of a virtual straight line connecting the first edge and the second edge while passing through the optical axis is greater than a length of a virtual straight line connecting the third edge and the fourth edge while passing through the optical axis.
15. The optical imaging system according to claim 13, wherein: When viewed in the optical axis direction, the first lens has a non-circular shape, a spacer having an opening disposed between the first lens and the second lens, and When viewed in the optical axis direction, the opening of the spacer has a non-circular shape.
16. The optical imaging system according to claim 15, wherein: The spacer has an inner peripheral surface defining the opening, wherein the inner peripheral surface includes a first inner side surface and a second inner side surface having an arc shape, and a third inner side surface and a fourth inner side surface connecting the first inner side surface and the second inner side surface to each other, and The third inner surface and the fourth inner surface each include at least one concave curved surface and at least one convex curved surface.
17. The optical imaging system according to claim 16, wherein: The at least one concave curved surface and the at least one convex curved surface alternate along the third inner side surface and the fourth inner side surface.
18. The optical imaging system according to claim 1, further comprising a reflective member disposed before the first lens. The reflective member has a reflective surface for changing the light path.
19. The optical imaging system according to claim 18, wherein: The reflecting member is a mirror or a prism.
Citation Information
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