Six-Lens Imaging System for Wide Field Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses struggle to provide a wide field of view while maintaining high optical performance and compactness, especially when used with large image sensors, due to difficulties in correcting aberrations and achieving sufficient brightness.
Innovation Solution
A compact imaging lens configuration with six constituent lenses, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with weak positive refractive power, a fourth lens with strong positive refractive power, a fifth lens as a double-sided aspheric meniscus lens, and a sixth lens with negative refractive power, optimized to achieve a high value of ih/f (0.87 to 1.04) and correct various aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional imaging lens is used with a large image sensor to achieve high resolution, then the optical system size increases, but various aberrations become more serious and optical performance deteriorates
Solution Approach 1:
The optical system is divided into six distinct lens groups with specific refractive powers and configurations. Each lens group (first through sixth lenses) has optimized characteristics that collectively resolve aberrations while maintaining compact size, allowing high resolution on large sensors without proportional increase in overall system complexity
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, changing the geometric parameters from traditional spherical to aspheric configurations. This parameter change enables better control of light rays across the entire field of view, correcting aberrations that would otherwise worsen with large sensor size while keeping the optical system compact
2Area of stationary object
If the lens is designed to provide a wide field of view, then the field angle increases, but correction of aberrations becomes very difficult particularly in the peripheral area
Solution Approach 1:
Different lens elements have locally optimized properties: the first lens has positive refractive power for overall focusing, the second and fifth lenses have negative refractive power for correcting specific aberrations, while the third and fourth lenses have positive refractive power. Each lens surface (object-side or image-side) is designed with specific curvature and aspheric coefficients tailored to its local function in the optical path, enabling comprehensive aberration correction across the wide field of view
Solution Approach 2:
The patent utilizes aspheric surfaces on multiple lens elements instead of simple spherical surfaces. The aspheric profiles (defined by coefficients A4, A6, A8, A10, A12, A14, A16) provide variable curvature across the lens surface, enabling precise control of light ray paths in the peripheral areas while maintaining a wide field of view of 80 degrees or more
3Length of moving object
If the imaging lens is made compact, then the total track length decreases, but it becomes difficult to achieve sufficient brightness and correct aberrations
Solution Approach 1:
The patent inverts the traditional approach by placing the aperture stop after the first lens rather than before it. This inversion allows the first lens to collect and focus light effectively, maintaining brightness while enabling a more compact overall configuration. The alternating arrangement of positive and negative refractive power lenses also inverts expected sequences to achieve compactness without sacrificing optical performance
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 high-brightness imaging lens with a wide field of view of 80 degrees or more, effectively correcting aberrations and achieving compactness, suitable for both small and large image sensors.
Implementation Method 1
an imaging lens for a solid-state image sensor in which constituent lenses are arranged in the following order from an object side to an image side: a first lens L1 with positive refractive power having a convex surface on the object side; a second lens L2 with negative refractive power having a concave surface on the image side; a third lens L3 with positive refractive power as a double-sided aspheric lens having a convex surface on the object side; a fourth lens L4 with positive refractive power having a convex surface on the image side; a fifth lens L5 with negative refractive power as a double-sided aspheric meniscus lens having a concave surface on the image side; and a sixth lens L6 with negative refractive power having a concave surface on the image side
Data Source
AI summary
A compact high-resolution imaging lens which provides a wide field of view of 80 degrees or more and corrects various aberrations properly. Designed for a solid-state image sensor, the imaging lens includes constituent lenses arranged in the following order from an object side to an image side: a first positive (refractive power) lens having a convex object-side surface; a second negative lens having a concave image-side surface; a third positive lens as a double-sided aspheric lens having a convex object-side surface; a fourth positive lens having a convex image-side surface; a fifth lens as a double-sided aspheric lens having a concave image-side surface; and a sixth negative lens having a concave image-side surface. The image-side surface of the sixth lens has an aspheric shape with a pole-change point in a position off an optical axis.