Six-Lens Camera Module with TTL/LB Ratio Control
Solution Overview
Problem
Existing camera lenses with six-piece lenses struggle to achieve a narrow angle and good optical properties in imaging status while maintaining a short total optical length and low height in retraction status, as the ratio of total optical length to back focal length is not sufficient, leading to inadequate height reduction during lens contraction.
Innovation Solution
A camera lens design with six-piece lenses, specifically optimized by controlling the refractive powers and curvature radii of each lens element, adhering to conditions such as TTL/LB ≤ 2.20, 7.50 ≤ D12/d2 ≤ 8.50, and −1.00 ≤ R6/R7 ≤ −0.35, to achieve a narrow angle and reduced height in retraction status while maintaining good optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the camera lens uses a six-piece lens structure with conventional design, then the angle of view can be narrowed to 49.4°, but the TTL/LB ratio remains insufficient and the height in retraction status is not reduced sufficiently
Solution Approach 1:
The patent applies parameter changes by precisely controlling the TTL/LB ratio to be 2.20 or less, the D12/d2 ratio to be within 7.50-8.50, and the R6/R7 ratio to be within -1.00 to -0.35. These parameter optimizations enable the lens to achieve a narrow angle of view while maintaining compact dimensions and good optical properties, resolving the contradiction between length reduction and optical performance maintenance
2Reliability
If the camera lens is designed for narrow angle imaging, then the angle of view is reduced to 50° or less, but the height in retraction status increases
Solution Approach 1:
The patent optimizes the TTL/IH ratio to be 1.40 or less in retraction status while maintaining a narrow angle of view of 50° or less. This parameter control ensures that the lens achieves both compact height when retracted and narrow angle imaging capability, resolving the contradiction between optical performance and compact dimensions
3Length of stationary object
If the TTL/LB ratio is increased to reduce height in retraction status, then the height is reduced, but the optical properties deteriorate
Solution Approach 1:
The patent identifies and controls multiple interrelated parameters simultaneously: TTL/LB ratio (≤2.20), D12/d2 ratio (7.50-8.50), d6/f ratio (0.04-0.08), and R6/R7 ratio (-1.00 to -0.35). This multi-parameter optimization approach enables the lens to achieve compact height in retraction status while maintaining good optical properties, resolving the contradiction between dimension reduction and performance maintenance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The optimized camera lens achieves a narrow angle of 50° or less in imaging status and a total optical length to image height ratio of 1.40 or less in retraction status, ensuring a compact and optically superior design suitable for smartphones with high-pixel camera elements.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power
Data Source
AI summary
The present invention relates to a field of optical lens, and discloses a camera lens with six-piece lenses including a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power. The camera lens satisfies following conditions: in an imaging status TTL/LB≤2.20, 7.50≤D12/d2≤8.50, 0.04≤d6/f≤0.08, and −1.00≤R6/R7≤−0.35. The present invention has a small height in a retraction status, and a narrow angle as well as good optical properties in the imaging status.