Two-Lens Projection Lens Assembly Miniaturization
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Solution Overview
Problem
Conventional projection lens assemblies face challenges with miniaturization, large distortion, and poor imaging quality due to increased complexity and aberrations, which hinder their application in portable electronic devices.
Innovation Solution
A projection lens assembly comprising two lenses with specific refractive powers and surface types, optimized for a compact design with a total track length of 3 mm to 3.7 mm, a numerical aperture of 0.18 or greater, and high light transmittance, reducing aberrations and improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to eliminate aberrations and improve resolution, then imaging quality is improved, but the total track length increases which is disadvantageous for miniaturization
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, curvature radii, and thicknesses of the two lenses. Specific conditional expressions are established for parameters such as the ratio of effective focal lengths, curvature radii relationships, and aperture ratios to optimize imaging quality while maintaining compact size. This allows achieving good imaging performance with only two lenses instead of requiring more lenses
Solution Approach 2:
The patent extracts and eliminates unnecessary lenses from the optical system. By carefully designing the two-lens configuration with specific parameter relationships, the system achieves aberration correction and imaging quality improvement without requiring additional lens elements, thus reducing the total track length
2Manufacturing precision
If the number of lenses is increased to improve resolution, then imaging quality is improved, but the device complexity increases
Solution Approach 1:
The patent uses parameter changes to achieve high resolution with a simple two-lens structure. By establishing specific relationships between curvature radii, thicknesses, and refractive powers through conditional expressions, the system optimizes light path control and aberration correction without increasing the number of lens elements, thus maintaining low device complexity
Solution Approach 2:
The patent merges multiple functions into the two-lens system. The first and second lenses work together to simultaneously achieve focus control, aberration correction, and resolution improvement. The coordinated design of the two lenses combines their optical powers and surface curvatures to accomplish what would traditionally require more separate lens elements
3Length of stationary object
If the total track length is reduced for miniaturization, then portability is improved, but it becomes more difficult to eliminate aberrations and maintain imaging quality
Solution Approach 1:
The patent applies parameter changes by establishing specific conditional expressions for the two-lens system. The relationships between curvature radii (R1, R2, R3, R4), thicknesses (d1, d2), effective focal lengths (f1, f2), and aperture ratios are precisely controlled to correct aberrations within the compact total track length of 3-3.7mm, maintaining imaging quality despite the reduced size
Solution Approach 2:
The patent uses composite lens design where the two lenses with different refractive powers and surface curvatures work together as a composite optical system. This composite structure enables effective aberration correction in a compact configuration by combining the optical properties of the two lenses in specific ratios and arrangements
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 miniaturization, high imaging quality, and increased numerical aperture, making the lens assembly suitable for portable electronic devices while maintaining high light transmittance and reducing sensitivity to curvature tolerances.
Implementation Method 1
The first lens may have a negative refractive power, a source-side surface of the first lens may be a concave surface, and an image-side surface of the first lens may be a convex surface
Implementation Method 2
The second lens may have a positive refractive power, and an image-side surface of the second lens may be a convex surface
Data Source
AI summary
A projection lens assembly is provided. The projection lens assembly includes sequentially from a source-side to an image-side along an optical axis: a first lens and a second lens. The first lens has a negative refractive power, a source-side surface of the first lens is a concave surface, and an image-side surface of the first lens is a convex surface. The second lens has a positive refractive power, and an image-side surface of the second lens is a convex surface.