Wide-Angle Lens Impact Resistance Design
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Solution Overview
Problem
Wide-angle lenses used in automotive sensor devices are prone to damage from external impacts due to the exposure of the first lens, which is not adequately protected against such stresses.
Innovation Solution
The wide-angle lens configuration includes a first negative meniscus lens with a specific thickness ratio to the focal length, combined with other lens elements to enhance impact resistance while maintaining suitable negative power and correcting aberrations, including the use of cemented lenses and specific curvature and sag amounts to prevent damage and optimize imaging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the first lens is increased to increase strength against impact, then impact resistance is improved, but the lens becomes too thick to obtain suitable negative power
Solution Approach 1:
The patent applies parameter changes by establishing a specific conditional expression (1.500 ≤ T1/f0 ≤ 1.850) that controls the thickness-to-focal-length ratio of the first lens. This quantitative constraint ensures the lens maintains both sufficient impact resistance and appropriate negative power by optimizing the physical parameters within defined boundaries.
Solution Approach 2:
The patent utilizes curved surfaces by specifying that the first lens is a negative meniscus lens with a concave curved surface on the image side. This curvature design enables the lens to achieve the required negative power while maintaining a balanced thickness that provides impact resistance without excessive thickness.
2Reliability
If the first lens is made thicker to protect against external impacts, then durability is improved, but the lens system becomes more complex and larger
Solution Approach 1:
The patent achieves multi-functionality by designing the first lens to simultaneously serve as both an optical element with specific negative power and as a protective element against impact. The optimized thickness within the conditional expression range allows the same component to fulfill both optical and mechanical protection functions without requiring additional separate elements.
Solution Approach 2:
The patent resolves the contradiction between durability and complexity by changing the physical parameters of the first lens within the conditional expression (1.500 ≤ T1/f0 ≤ 1.850). This parameter optimization enables the lens to be thick enough for protection but not so thick as to create excessive complexity, maintaining a balanced design.
3Strength
If the first lens thickness is increased to resist impact, then strength is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent addresses the contradiction between strength and aberration correction by precisely controlling the thickness parameter within the conditional expression (1.500 ≤ T1/f0 ≤ 1.850). This optimized parameter range ensures the lens is thick enough for impact resistance while maintaining the optical precision required for effective aberration correction.
Solution Approach 2:
The patent utilizes the concave curved surface design of the first lens to manage aberrations. The specific curvature configuration, combined with the optimized thickness within the conditional expression, enables the lens to provide both impact resistance and effective aberration correction without compromise.
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 configuration effectively increases the first lens's thickness for enhanced impact resistance, prevents it from becoming too thick, and corrects various aberrations, ensuring high-pixel imaging and reduced chromatic aberration, while maintaining a compact size and improved temperature characteristics.
Implementation Method 1
a first lens disposed on the most object side in the front group is a negative meniscus lens whose lens surface on the image side is a concave curved surface
Implementation Method 2
since the fifth group is a cemented lens consisting of the biconcave fifth lens and the biconvex sixth lens, it is advantageous in correcting a magnification chromatic aberration
Data Source
AI summary
The present invention provides a wide-angle lens capable of obtaining a suitable negative power even when a thickness of a first lens is increased in order to increase strength against impact. The wide-angle lens 100 has a front group 110, an aperture 80, and a rear group 120. Assuming that a central thickness in an optical axis direction of a first lens 10 is T1 (mm) and a focal length of the entire lens system is f0 (mm), the following conditional expression:1.500≤T1/f0≤2.000 Conditional expression (1)is satisfied. Therefore, it is possible to suppress the first lens 10 from being damaged by impact. In addition, it is possible to prevent the first lens 10 from becoming too thick to obtain suitable negative power.