Curved Image Sensor with Cemented Lens for Wide-Angle Aberration Control
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Solution Overview
Problem
Conventional image pickup apparatuses face challenges in achieving a wide angle of view with favorable aberration correction and reduced size, often requiring additional lenses for curvature correction, which increases the system's diameter and complexity.
Innovation Solution
An image pickup apparatus with an image forming optical system that includes an aperture stop and a cemented lens with a specific arrangement of lenses, featuring a negative and positive refractive power configuration, allowing for a curved image pickup surface and reduced lens count, thereby minimizing system size while maintaining high imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional lenses are added to correct curvature and achieve wide angle of view, then image quality and aberration correction are improved, but device complexity and system diameter increase
Solution Approach 1:
The patent combines multiple lens functions into a single cemented lens unit. Specifically, it uses one cemented lens comprising a negative lens and a positive lens bonded together, which integrates the curvature correction and wide-angle capabilities that would traditionally require separate lens elements. This merging approach maintains effective aberration correction while reducing the overall lens count and system complexity.
2Manufacturing precision
If additional lenses are added to correct curvature and achieve wide angle of view, then image quality and aberration correction are improved, but system size increases
Solution Approach 1:
The patent merges multiple lens functions into a single cemented lens unit, reducing the overall system diameter. By using one cemented lens with a negative lens and a positive lens bonded together, the design achieves effective curvature correction and wide-angle performance without requiring additional separate lens elements that would increase the system's physical size.
3Device complexity
If lens count is reduced to minimize system size, then device complexity is reduced, but aberration correction capability deteriorates
Solution Approach 1:
The patent employs parameter changes by optimizing the refractive indices and curvature radii of the lens surfaces within the cemented lens. By carefully selecting and adjusting these optical parameters, the design achieves effective aberration correction with a reduced lens count. The specific configuration of the negative and positive lenses with optimized parameters enables the system to maintain high imaging performance despite having fewer lens elements.
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 enables a compact image pickup apparatus with a wide angle of view, effective aberration correction, and reduced curvature of field effects, enhancing image quality and reducing the risk of light degradation and distortion.
Implementation Method 1
the cemented lens includes in order from an object side, a first lens having a negative refractive power, a second lens, and a third lens having a positive refractive power
Data Source
AI summary
An image pickup apparatus includes an image forming optical system which includes an aperture stop that determines an axial light beam, and one cemented lens, and an image pickup section which is disposed on an image side of the image forming optical system, and which has a surface which is not flat and is curved to be concave toward the image forming optical system, wherein the cemented lens includes in order from an object side, a first lens having a negative refractive power, a second lens, and a third lens having a positive refractive power.