Aspheric Imaging Lens with Reflecting Surface for Wide Angle
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Solution Overview
Problem
Existing wide angle lenses for camera modules face challenges in achieving a large viewing angle while maintaining a compact design, as they require multiple pieces of lenses, leading to thickness and cost burdens, and often suffer from poor aberration characteristics.
Innovation Solution
A wide angle lens design incorporating a reflecting surface on an aspheric first lens, combined with multiple lenses of varying refractive powers, including negative and positive meniscus forms, to enhance the imaging angle without increasing thickness, and improve aberration characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pieces of negative and positive power lenses are used to enlarge imaging angle, then viewing angle is improved, but device complexity and thickness increase
Solution Approach 1:
The lens system is divided into multiple elements with different refractive powers (negative and positive) arranged in a specific sequence. The first lens has negative power to expand the imaging angle, while subsequent positive power lenses compensate for aberrations and control the overall focal length, achieving a balanced design that resolves the contradiction between wide viewing angle and structural complexity
Solution Approach 2:
The patent optimizes specific parameters including the refractive indices, curvatures, and spacing between lens elements. By carefully selecting and adjusting these parameters, the system achieves a wide viewing angle while maintaining compact thickness, resolving the contradiction between optical performance and physical dimensions
2Length of stationary object
If multiple pieces of lenses are compacted to reduce thickness, then device thickness is improved, but manufacturing complexity and cost increase
Solution Approach 1:
Multiple lens elements are nested and arranged in a compact configuration where each lens is positioned closely against the others along the optical axis. This nested arrangement maximizes space utilization and minimizes overall thickness while maintaining manageable manufacturing complexity through standardized lens mounting structures
3Ease of manufacture
If conventional lens structures are used, then manufacturing simplicity is maintained, but aberration characteristics deteriorate
Solution Approach 1:
Different regions of the lens system are designed with specialized characteristics - the first lens uses negative power with specific curvature to control peripheral rays and reduce coma aberration, while subsequent positive power lenses are optimized for different zones to correct various aberrations locally, achieving superior overall aberration correction while maintaining manufacturing feasibility
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 design achieves a wide angle lens with superior optical performance and aberration correction, reducing thickness concerns and enhancing imaging capabilities without the need for additional apertures, as demonstrated by improved coma aberration and modulation transfer function (MTF) characteristics.
Implementation Method 1
a first lens including an incidence surface having a positive (+) refractive power and incident with light
Implementation Method 2
a reflecting surface reflecting the incident light
Data Source
AI summary
Provided is an imaging lens, the imaging lens including in an orderly way from an object side, a first lens including an incidence surface having a positive (+) refractive power and incident with light, a reflecting surface reflecting the incident light and an exit surface outputting the reflected light; a second lens having a negative (−) refractive power; a third lens having a positive (+) refractive power; a fourth lens having a positive (+) refractive power; a fifth lens having a negative (−) refractive power; a sixth lens having a positive (+) refractive power; and a seventh lens having a positive (+) refractive power, wherein the second lens through the seventh lens are disposed in an orderly way from an exit surface of the first lens.