Six-Lens Camera Module Narrow Angle Compact Retraction
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Solution Overview
Problem
Existing camera lenses with six-piece lens structures struggle to achieve a narrow angle and good optical properties in the imaging status while maintaining a short total optical length (TTL) and low height in the retraction status.
Innovation Solution
A camera lens design with six-piece lenses, optimized by specific refractive power distributions and curvature radius ratios, which satisfies conditions such as TTL/LB ≤ 2.40, 0.20 ≤ R1/R2 ≤ 0.35, and 0.02 ≤ d5/f ≤ 0.04, to achieve a narrow angle and good optical performance while allowing for a compact retraction status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the camera lens uses a six-piece lens structure with conventional design, then the angle of view can be narrowed to 46.6° or less, 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 optimizing specific curvature radius ratios (R1/R2 between 0.20-0.35, R7/R8 between 0.10-0.55) and thickness-to-focal-length ratios (d5/f between 0.02-0.04, d12/f between 0.08-0.12) of the lens elements. These precise parameter adjustments enable the lens to achieve a narrow angle of view (2ω≤50°) while simultaneously reducing the TTL/LB ratio to 2.40 or less, resolving the contradiction between angle of view and optical length.
2Shape
If the camera lens is designed for narrow angle imaging, then the angle of view is reduced to 50° or less, but the total optical length (TTL) becomes longer
Solution Approach 1:
The patent resolves this contradiction through systematic parameter optimization of the six-piece lens structure. By controlling the curvature radius ratios (R1/R2: 0.20-0.35, R7/R8: 0.10-0.55) and center thickness ratios (d5/f: 0.02-0.04, d12/f: 0.08-0.12), the design achieves a narrow angle of view (2ω≤50°) while maintaining TTL/LB≤2.40, thereby preventing excessive total optical length despite the narrow angle requirement.
Solution Approach 2:
The patent divides the optical system into six distinct lens elements with specific refractive power distributions (positive, negative, and mixed). This segmentation allows each element to contribute optimally to angle of view reduction while controlling the overall TTL through independent optimization of each element's parameters, rather than relying on a single monolithic lens design.
3Reliability
If the camera lens structure is optimized for imaging performance with narrow angle, then optical properties are improved, but the height in retraction status is not sufficiently reduced
Solution Approach 1:
The patent simultaneously optimizes multiple parameters to resolve this contradiction: curvature radius ratios (R1/R2: 0.20-0.35, R7/R8: 0.10-0.55), center thickness ratios (d5/f: 0.02-0.04, d12/f: 0.08-0.12), and TTL/LB ratio (≤2.40). These coordinated parameter changes ensure that the lens achieves excellent optical properties for narrow angle imaging (2ω≤50°) while reducing the height in retraction status through TTL/IH≤1.50.
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 camera lens achieves a narrow angle of 2ω ≤ 50° with good optical properties in the imaging status and a compact retraction status with TTL/IH ≤ 1.50, resulting in a small height during retraction.
Implementation Method 1
a first lens having a positive refractive power
Implementation Method 2
a second lens having a negative refractive power
Implementation Method 3
a fourth lens having a positive refractive power
Implementation Method 4
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 negative refractive power, a third lens, a fourth lens having a positive refractive power, a fifth lens, and a sixth lens having a negative refractive power. The camera lens satisfies following conditions: in an imaging status TTL/LB≤2.40, 0.20≤R1/R2≤0.35, 0.20≤R1/R2≤0.35, 0.02≤d5/f≤0.04, and −0.90≤f2/f≤−0.70. 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.