Optical imaging system
By rationally configuring the number of lenses and optical focal length of the optical imaging lens, especially the focal length and refractive index of the first and fourth lenses, the problem of performance degradation of lenses in wearable devices due to temperature changes is solved, and high imaging quality and wide-angle characteristics are achieved over a wide temperature range.
Patent Information
- Application Number
- CN202310114560.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-02-02
- Publication Date
- 2025-09-16
- Estimated Expiration
- 2043-02-02
AI Technical Summary
When wearable devices are in use, the temperature rises, causing the lens performance to degrade, affecting the user experience. Existing technologies make it difficult to effectively reduce the lens' sensitivity to temperature.
A six-element optical imaging lens is designed. By rationally configuring the number of lenses and their optical power, especially the focal lengths and refractive indices of the first and fourth lenses, and combining the curvature radius and Abbe number of the fourth lens, temperature drift and chromatic aberration are corrected to improve imaging quality.
It achieves temperature drift correction within the range of -20° to 60°, improves the imaging quality and wide-angle characteristics of the lens at different temperatures, and ensures high imaging performance.
Smart Images
Figure CN115980975B_ABST
Abstract
Claims
1. An optical imaging system, characterized in that Along the optical axis from the object side to the image side, it includes: a first lens having negative optical power, wherein the object-side surface is convex and the image-side surface is concave; a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave; The third lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; a fourth lens element having positive optical power, with a convex object-side surface and a convex image-side surface; a fifth lens element having negative optical power and a concave object-side surface; and The sixth lens element has positive or negative optical power, and its object-side surface is convex and its image-side surface is concave; wherein, At least one of the mirror surfaces of each of the first lens to the sixth lens is an aspherical mirror surface; The effective focal length f1 of the first lens, the effective focal length f4 of the fourth lens, the refractive index N1 of the first lens, and the refractive index N4 of the fourth lens satisfy the following: -2.03≤f1×N1 / (f4×N4)≤-1.70; and An axial distance SAG41 between an intersection of the object-side surface of the fourth lens and the optical axis and a vertex of an effective radius of the object-side surface of the fourth lens, an Abbe number V4 of the fourth lens, a curvature radius R7 of the object-side surface of the fourth lens, and a curvature radius R8 of the image-side surface of the fourth lens satisfy the following conditions: 1.30≤SAG41×V4 / (R7-R8)≤2.36; The effective focal length f1 of the first lens, the refractive index N1 of the first lens, the curvature radius R1 of the object-side surface of the first lens, and the curvature radius R2 of the image-side surface of the first lens satisfy the following conditions: -3.32≤f1×N1 / (R1+R2)≤-2.86; The number of lenses having optical power in the optical imaging system is six.
2. The optical imaging system according to claim 1, wherein: The effective focal length f of the optical imaging system, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens satisfy: -6.81≤f×(V1-V2) / (f1+f2)≤-3.
33.
3. The optical imaging system according to claim 1, wherein: The curvature radius R1 of the object-side surface of the first lens, the curvature radius R4 of the image-side surface of the second lens, and the combined focal length f12 of the first lens and the second lens satisfy: -1.78≤(R1+R4) / f12≤-1.
56.
4. The optical imaging system according to claim 1, wherein: The refractive index N5 of the fifth lens, the curvature radius R3 of the object-side surface of the second lens, and the curvature radius R4 of the image-side surface of the second lens satisfy: 4.30≤N5×(R3+R4) / (R3-R4)≤8.
13.
5. The optical imaging system according to claim 1, wherein: The combined focal length f23 of the second lens and the third lens, the center thickness CT2 of the second lens on the optical axis, the center thickness CT3 of the third lens on the optical axis, and the on-axis distance SAG22 between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens satisfy: 3.91≤f23 / (CT2+CT3+SAG22)≤5.
87.
6. The optical imaging system according to claim 1, wherein: The effective focal length f3 of the third lens, the refractive index N3 of the third lens, the curvature radius R5 of the object side surface of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy: 0.96≤f3×N3 / (R5+R6)≤3.
10.
7. The optical imaging system according to claim 1, wherein: The effective focal length f4 of the fourth lens, the refractive index N4 of the fourth lens, the center thickness CT4 of the fourth lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 3.23≤f4×N4 / (CT4+T34)≤3.
64.
8. The optical imaging system according to claim 1, wherein: The combined focal length f45 of the fourth lens and the fifth lens, the air gap T45 between the fourth lens and the fifth lens on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the on-axis distance SAG52 between the intersection of the image-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fifth lens satisfy the following conditions: 4.47≤f45 / (T45+CT5+SAG52)≤5.
69.
9. The optical imaging system according to any one of claims 1 to 8, characterized in that: The combined focal length f56 of the fifth lens and the sixth lens, the curvature radius R9 of the object-side surface of the fifth lens, and the curvature radius R12 of the image-side surface of the sixth lens satisfy: 0.53≤f56 / (R9-R12)≤0.
67.
10. The optical imaging system according to any one of claims 1 to 8, characterized in that: The combined focal length f456 of the fourth lens, the fifth lens, and the sixth lens, the curvature radius R8 of the image side surface of the fourth lens, and the curvature radius R11 of the object side surface of the sixth lens satisfy: 3.96≤f456 / (R8+R11)<14.
5.
11. The optical imaging system according to any one of claims 1 to 8, wherein: The effective focal length f1 of the first lens, the maximum half field of view Semi-FOV of the optical imaging system and the effective focal length f4 of the fourth lens satisfy: -3.5<f1×Tan(Semi-FOV) / f4≤-2.86.
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