Aspheric Optical Lens Layout for Compact Aberration Correction
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Solution Overview
Problem
Existing optical systems face challenges in achieving good optical performance from the center to the periphery of the angle of view while maintaining a reduced size and weight, particularly with resin-molded aspheric lenses.
Innovation Solution
The optical system comprises a plurality of lenses, including a negative lens with an inflection point and aspheric surfaces, arranged to satisfy specific inequalities that balance focal length, image height, and effective diameter, allowing for reduced size and improved aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a resin-molded aspheric lens is used to reduce size and weight, then the optical system becomes more compact, but optical performance from center to periphery deteriorates
Solution Approach 1:
The optical system is divided into multiple lenses (first lens, second lens, third lens) with different refractive powers and aberration correction functions. Each lens segment handles specific optical tasks, allowing the system to achieve both compactness and high optical performance that a single lens cannot provide alone.
Solution Approach 2:
Different regions of the optical system are optimized with different lens characteristics. The first lens has strong positive refractive power for compactness, the second lens corrects curvature of field, and the third lens corrects distortion. This local optimization ensures high optical performance across the entire field of view while maintaining reduced size.
2Volume of moving object
If the optical system is made compact, then size is reduced, but aberration correction becomes more difficult
Solution Approach 1:
Aberration correction is segmented across multiple lenses: the second lens specifically addresses curvature of field aberration, while the third lens addresses distortion aberration. This division of correction functions allows each lens to be optimized for its specific correction task while contributing to the overall compact design.
Solution Approach 2:
The patent optimizes specific parameters including the refractive indices and curvatures of each lens surface. By carefully selecting and adjusting these parameters across the three-lens system, the design achieves effective aberration correction within a compact configuration, resolving the contradiction between size reduction and correction quality.
3Manufacturing precision
If a negative lens with inflection point is used, then curvature of field and distortion are corrected, but the lens design becomes more complex
Solution Approach 1:
The complex aberration correction function is segmented across three lenses with distinct roles. The negative lens with inflection point handles specific correction tasks, while the two positive lenses provide complementary correction and refractive power. This segmentation distributes the design complexity across multiple standardized lens elements rather than requiring a single complex lens.
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 system achieves high optical performance with reduced size and weight by effectively correcting curvature of field and distortion, while maintaining a compact design.
Implementation Method 1
an optical system that has good optical performance from the center to the periphery of an angle of view
Data Source
AI summary
Optical systems and image pickup apparatuses are provided herein. One or more optical systems may include a plurality of lenses arranged in order from an object side to an image side. A lens closest to an image plane of the optical system is a negative lens having an inflection point. Predetermined inequalities may be satisfied.