Curved Image Sensor Lens Aberration Correction
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Solution Overview
Problem
Existing image pickup systems face challenges in achieving a wide angle of view with high resolution while maintaining a small size, as they often require additional lenses for aberration correction, leading to increased size and complexity.
Innovation Solution
The image pickup apparatus employs an image forming optical system with a first lens component having negative refractive power, a second lens component with positive refractive power, and a third lens component, where the first lens surface is convex towards the object side and the second lens surface has a concave area towards the object side, satisfying specific conditional expressions to optimize imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional lenses are added for aberration correction, then imaging performance is improved, but device size and complexity increase
Solution Approach 1:
The patent changes the geometric parameters of the lens surfaces (convex object-side surface of first lens, concave object-side surface of second lens) and satisfies specific conditional expressions for radius of curvature to correct aberrations while maintaining a simple three-lens structure, avoiding the need for additional correction lenses
Solution Approach 2:
The patent applies different surface curvatures to different regions of the lenses - the first lens has a convex object-side surface while the second lens has a concave object-side surface, with specific radius of curvature relationships that locally optimize aberration correction in different parts of the optical path
2Manufacturing precision
If additional lenses are added for aberration correction, then imaging performance is improved, but the optical system size increases
Solution Approach 1:
By optimizing the radius of curvature parameters and satisfying the conditional expression, the patent achieves effective aberration correction within a compact three-lens configuration, eliminating the need for extended optical paths that would result from adding more lenses
3Adaptability or versatility
If a wide angle of view is achieved, then photographing range is improved, but resolution and imaging quality deteriorate
Solution Approach 1:
The patent satisfies the conditional expression relating the radii of curvature of the first lens surfaces, which optimizes the optical path for wide-angle light rays while maintaining focus quality and minimizing aberrations across the entire photographing range
Solution Approach 2:
The specific surface curvature configurations (convex object-side surface of first lens, concave object-side surface of second lens) are designed to handle off-axis light rays differently from on-axis rays, maintaining resolution quality across the wide field of view
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 configuration allows for a small-sized optical system with a wide angle of view, reduced aberrations, and improved imaging performance, including suppression of curvature of field, astigmatism, and coma, while maintaining a high resolution across the entire photographing range.
Implementation Method 1
an image forming optical system which includes an aperture stop which determines an axial light beam, and a plurality of lens components
Data Source
AI summary
An image pickup apparatus includes an image forming optical system which includes an aperture stop and a plurality of lens components, and an image pickup section which has a light-receiving surface which is not flat but is curved to be concave toward the image forming optical system. The image forming optical system includes a first lens component having a negative refractive power, a second lens component having a positive refractive power, and a third lens component having a positive refractive power. In the first lens component, a lens surface on the object side is convex toward the object side, and in a lens surface on the object side of the second lens component, a part of an area is concave toward the object side. Moreover, the following conditional expression (1) is satisfied:0.5<(R1L+R1R)/(R1L−R1R)<2.5 (1).