Telecentric Lens System for High-Resolution Wide-Area Imaging
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Solution Overview
Problem
Current image pickup systems face challenges in achieving high resolution and wide area observation while maintaining a compact size, particularly in digital zooming applications, due to limitations in optical system design that lead to aberrations and fluctuations in magnification.
Innovation Solution
The proposed image pickup apparatus incorporates a specific optical system configuration with multiple lens units and a stop, where the first lens unit has a positive refractive power and the second lens unit has a negative refractive power, satisfying conditional expressions to ensure telecentricity, correct aberrations, and optimize the overall length, allowing for high-resolution imaging over a wide area with minimal size and fluctuation in magnification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a lens system is designed to achieve wide area observation, then the area of observation is improved, but the resolution and magnification accuracy deteriorate due to aberrations
Solution Approach 1:
The optical system is divided into multiple lens units (first lens unit with positive refractive power, second lens unit with negative refractive power) that work together to correct aberrations while maintaining wide area observation capability. Each lens unit is optimized for specific functions, with the first unit handling object-side aberration correction and the second unit handling image-side correction.
Solution Approach 2:
The patent applies specific conditional expressions that define precise parameter relationships between lens elements, focal lengths, and aberration coefficients. By optimizing these parameters within specific ranges, the system achieves both wide area coverage and high magnification accuracy simultaneously.
2Volume of moving object
If the optical system is made compact, then the size is reduced, but the ability to correct aberrations and maintain telecentricity deteriorates
Solution Approach 1:
The lens units are arranged in a compact nested configuration where the first lens unit and second lens unit are positioned close together with the stop between them. This nested arrangement allows the system to maintain a compact overall size while still providing sufficient space for aberration correction through the coordinated action of multiple lens elements.
Solution Approach 2:
The optical system uses a composite lens design combining multiple lens types with different refractive powers and aberration characteristics. This composite approach allows compact packaging while maintaining high performance in aberration correction and telecentricity through the synergistic effect of different lens elements.
3Adaptability or versatility
If digital zooming is applied to magnify image parts, then the magnification capability is improved, but the resolution and detail accuracy deteriorate
Solution Approach 1:
The optical system performs preliminary action by capturing the complete sample image with high resolution and accurate magnification characteristics in the first place. The optimized lens design ensures that the full-resolution image is captured correctly, providing a solid foundation for subsequent digital zooming operations without sacrificing detail accuracy.
Solution Approach 2:
The system creates an accurate optical copy of the sample with preserved resolution and detail information. By ensuring the optical image itself is of high quality with correct magnification, the system provides a good base for digital processing, allowing the copied image to be magnified digitally without significant loss of detail accuracy.
4Measurement precision
If the optical system is designed for high resolution, then the measurement precision is improved, but the area of observation and compact size deteriorate
Solution Approach 1:
The optical system segments the imaging function across multiple lens units, each contributing to different aspects of performance. The first lens unit optimizes for resolution and the second lens unit optimizes for field of view and aberration correction, allowing both high resolution and wide area observation to coexist.
Solution Approach 2:
Different regions of the optical system are optimized for different qualities: the first lens unit is designed with characteristics optimized for resolution and detail, while the second lens unit is designed with characteristics optimized for field of view and telecentricity. This local optimization allows the overall system to achieve both high resolution and wide area coverage.
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 enables high-resolution imaging with reduced aberrations and fluctuations, allowing for accurate dimension measurement and detailed observation even when the object position changes, while maintaining a compact optical system.
Implementation Method 1
an optical image is formed on the image pickup element by the optical system, and the optical system includes in order from an object side, a first lens unit which includes a plurality of lenses, a stop, and a second lens unit which includes a plurality of lenses
Implementation Method 2
the image pickup element includes a plurality of pixels which converts light intensity to an electric signal
Data Source
AI summary
An image pickup apparatus includes an image pickup element and an optical system. The image pickup element includes a plurality of pixels, and the plurality of pixels is arranged in rows two-dimensionally. The optical system includes in order from an object side, a first lens unit which includes a plurality of lenses, a stop, and a second lens unit which includes a plurality of lenses. The first lens unit includes a first object-side lens which is disposed nearest to an object, and the second lens unit includes a second image-side lens which is disposed nearest to an image. The following conditional expressions (1), (2), (3), (4), and (5) are satisfied:3250<2Y/p (1),−1.0<β (2),CRAobj<10 deg (3),2.0<LL/√(Y×Yobj)<15.0 (4), and0.5<LTL/Doi<0.95 (5).