Optical Lens with Aperture Stop Between Groups for Wide Angle Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical lenses face challenges in achieving a balance between being thinner, having high optical performance, low fabrication costs, large effective aperture, wide viewing angles, and light weight while maintaining good imaging quality.
Innovation Solution
The optical lens design consists of a first lens group with negative refractive power and a second lens group with positive refractive power, arranged with an aperture stop between them, featuring at least six to nine lenses, a full field of view of 160 to 180 degrees, and specific diameter and distance ratios to optimize light converging capability and reduce aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical lens uses more lenses to improve imaging quality, then the imaging quality improves, but the device complexity and fabrication cost increase
Solution Approach 1:
The optical lens system is divided into two functional groups: a first lens group with negative refractive power and a second lens group with positive refractive power. This segmentation allows each group to handle specific optical functions, achieving high imaging quality while limiting the total number of lenses to 6-9 elements.
Solution Approach 2:
The patent specifies precise parameter ranges including the ratio of total lens length to image height (0.16 ≤ LT/IMH < 0.22), field of view (160°-180°), and entrance pupil diameter (>2mm). These parameter optimizations enable high imaging quality with a controlled number of lenses, balancing performance and complexity.
2Length of moving object
If the optical lens is designed to be thinner, then the device portability improves, but the optical performance and imaging quality deteriorate
Solution Approach 1:
The patent inverts the conventional lens arrangement by placing the aperture stop between the first lens group (negative power) and the second lens group (positive power). This inverted configuration, combined with the specific power distribution, enables thinning the overall lens structure while maintaining optical performance through optimized light path control.
Solution Approach 2:
By optimizing parameters such as the LT/IMH ratio (0.16 ≤ LT/IMH < 0.22) and controlling the number of lenses (6-9 elements), the patent achieves a thin profile while preserving high optical performance and imaging quality.
3Adaptability or versatility
If the optical lens increases the field of view to 160-180 degrees, then the viewing angle improves, but the aberration control and imaging quality become more difficult
Solution Approach 1:
The division into first lens group (negative power) and second lens group (positive power) with aperture stop between them enables wide field of view (160°-180°) while maintaining aberration control. Each group handles specific angular ranges, distributing the optical burden and preserving image quality across the wide viewing angle.
4Manufacturing precision
If the optical lens uses more lens elements to improve imaging quality, then the light weight requirement conflicts with the need for more materials
Solution Approach 1:
The optical lens is segmented into two functional groups with 6-9 total elements, optimizing the balance between imaging quality and weight. This segmentation achieves high performance with minimal lens count, directly addressing the weight reduction requirement while maintaining superior image quality.
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
This design results in an optical lens with lighter weight, lower fabrication costs, and superior imaging quality, meeting the requirements of wide viewing angles and high optical performance within a compact form.
Implementation Method 1
The optical lens includes a first lens group and a second lens group arranged in order from a first side to a second side... The first lens group has a negative refractive power, and the second lens group has a positive refractive power
Data Source
AI summary
An optical lens includes a first lens group and a second lens group arranged in order from a first side to a second side, and an aperture stop disposed between the first lens group and the second lens group. The optical lens satisfies the condition of LT/IMH<4.7, where IMH is semi-diagonal image height on an image plane, and LT is a distance along an optical axis between a surface of a first lens of the first lens group facing the first side and a surface of a last lens of the second lens group facing the second side. The first lens is closest to the first side among the first lens group, and the last lens is closest to the second side among the second lens group.