Eight-Element Photographing Lens Design for Compact Wide-Field Imaging
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance among high image quality, low sensitivity, proper aperture size, miniaturization, and desirable field of view, particularly with the advancement of image sensors and increasing functionality requirements in electronic devices.
Innovation Solution
A photographing lens system comprising eight lens elements, each with specific refractive powers and surface configurations, including a first lens with positive power, a second lens with negative power, and an eighth lens with a concave image-side surface and inflection points, optimized by conditions such as focal lengths, curvature radii, and thickness ratios to enhance image quality and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The optical system is divided into eight distinct lens elements with specific positive and negative refractive powers, where the second, third, and seventh lens elements have negative refractive power. This segmentation allows each element to correct specific aberrations independently, achieving high image quality while maintaining a manageable complexity through functional specialization of each lens element.
Solution Approach 2:
Different regions of the lens elements have different surface configurations - for example, the image-side surface of the eighth lens element is concave in the paraxial region but has inflection points in the marginal region. This local quality variation allows optimal correction of aberrations in different field regions while maintaining overall system compactness.
2Use of energy by moving object
If the aperture size is increased to improve light gathering, then light gathering is improved, but sensitivity and miniaturization are compromised
Solution Approach 1:
The patent specifies precise parameter ranges including focal length ratios (f7/f, f8/f), curvature radius ratios (R11/f), and thickness ratios (CT1/CT7, CT8/CT7) to optimize the balance between aperture size and light gathering. By carefully controlling these parameters, the system achieves proper aperture size that balances light gathering capability with miniaturization requirements.
3Adaptability or versatility
If the field of view is enlarged to improve functionality, then functionality is improved, but aberration correction becomes more difficult
Solution Approach 1:
The lens elements are designed with aspheric surfaces that have dynamic curvature characteristics - the image-side surface of the eighth lens element transitions from concave in the paraxial region to having inflection points in the marginal region. This dynamic surface configuration enables effective aberration correction across a wide field of view by adapting the optical power distribution to different field angles.
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 improved image quality, miniaturization, and field of view while correcting aberrations and chromatic aberrations, supporting various applications in electronic devices.
Implementation Method 1
The first lens element has positive refractive power. The second lens element has negative refractive power. The seventh lens element has negative refractive power.
Data Source
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AI summary
A photographing lens system includes eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) which are, in order from an object side to an image side along an optical path: a first lens element (E1), a second lens element (E2), a third lens element (E3), a fourth lens element (E4), a fifth lens element (E5), a sixth lens element (E6), a seventh lens element (E7) and an eighth lens element (E8). Each of the eight lens elements (E1, E2, E3, E4, E5, E6, E7, E8) has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The first lens element (E1) has positive refractive power. The second lens element (E2) has negative refractive power. The seventh lens element (E7) has negative refractive power. The image-side surface of the eighth lens element (E8) is concave in a paraxial region thereof, and the image-side surface of the eighth lens element (E8) has at least one inflection point.