Camera Lens Assembly Miniaturization with Low Temperature Sensitivity
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Solution Overview
Problem
Existing iris recognition technologies face challenges in achieving high image quality and adaptability across varying environments, particularly in terms of temperature sensitivity and miniaturization.
Innovation Solution
A camera lens assembly comprising two lens groups with specific optical configurations, including a first lens group with positive focal power and a second lens group with negative focal power, along with an infrared filter, to enhance image quality and reduce temperature sensitivity while minimizing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a miniaturized lens assembly is designed, then the device size is reduced, but the image quality and temperature sensitivity performance deteriorate
Solution Approach 1:
The lens assembly is divided into two distinct lens groups: a first lens group with positive focal power and a second lens group with negative focal power. This segmentation allows each group to contribute differently to the overall optical performance, enabling miniaturization while maintaining temperature stability through the complementary effects of the two groups
Solution Approach 2:
Specific parameter relationships are established to control temperature sensitivity: the ratio of focal lengths (0.803 ≤ f1/f2 ≤ 1.21), the radius of curvature ratio (0.51 ≤ R1/R2 ≤ 0.694), and the effective radius ratio (1.106 ≤ DT12/DT21 ≤ 1.427). These parameter optimizations enable the compact design to achieve low temperature sensitivity despite the reduced size
2Volume of moving object
If a miniaturized lens assembly is designed, then the device size is reduced, but the image quality deteriorates
Solution Approach 1:
By segmenting the optical system into two lens groups with opposite focal powers, the design achieves better aberration correction in a compact form. The positive focal power group converges light while the negative focal power group diverges it, creating a balanced optical path that maintains high image quality despite the reduced overall size
Solution Approach 2:
The lens assembly uses composite optical design combining lenses with different focal power characteristics (positive and negative). This composite approach allows the small-sized assembly to achieve superior image quality by leveraging the complementary optical properties of the two lens groups
3Measurement precision
If high image quality is achieved through optimized optical parameters, then the manufacturing complexity increases
Solution Approach 1:
The patent establishes specific parameter ranges and relationships (focal length ratio, radius of curvature ratio, effective radius ratio) that optimize image quality while remaining manufacturable. These parameter specifications provide clear manufacturing targets that balance optical performance with manufacturing feasibility
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 solution achieves low temperature sensitivity and high image quality, improving iris recognition accuracy and adaptability, while also being miniaturized for broader environmental applicability.
Implementation Method 1
a first lens group and a second lens group, wherein the first lens group includes a first lens and a second lens; the second lens group includes at least a third lens
Implementation Method 2
a filter is provided between the second lens group and the image side
Data Source
AI summary
The present application discloses a camera lens assembly, the camera lens assembly, from an object side to an image side, sequentially including a first lens group and a second lens group, wherein the first lens group includes a first lens and a second lens; the second lens group includes at least a third lens; a filter is provided between the second lens group and the image side; and a radius of curvature of an object side surface of the first lens R1 and a radius of curvature of an image side surface of the first lens R2 satisfy: 0.5<R1/R2<1. The camera lens assembly according to the present application includes two sets of lens groups and the filter, and has characteristics of a low temperature sensitivity, a high image quality and miniaturization.