Projection Lens Design for Compact Micro-Optics
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Solution Overview
Problem
Existing micro-projection lenses are bulky and complex, making them difficult to miniaturize, assemble, and produce cost-effectively while also suffering from optical aberrations that degrade imaging quality.
Innovation Solution
A compact projection lens design comprising six lenses arranged along the optical axis, including a first negative focal power lens, two glued lenses with positive and negative focal powers, and a sixth positive focal power lens, which eliminates aberrations and reduces production costs through modularization and tolerance in lens assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing micro-projection lens designs are used, then optical imaging function is achieved, but the lens becomes bulky and complex
Solution Approach 1:
The optical system is segmented into six distinct lens elements with specific focal powers arranged along the optical axis. This segmentation allows each lens to perform specific optical functions (negative focal power for divergence, positive focal power for convergence), enabling compact design while maintaining imaging quality and reducing overall complexity compared to monolithic designs
Solution Approach 2:
Multiple lens elements are merged into a compact arrangement where the first negative lens, two positive lenses, and two negative lenses are combined in sequence. This merging of optical functions into a compact six-element system reduces the overall volume while achieving the desired optical performance without the bulk of traditional designs
2Ease of manufacture
If existing micro-projection lens designs are used, then optical imaging function is achieved, but processing and assembly difficulty increases
Solution Approach 1:
The design specifies precise focal power parameters for each lens element (first lens: negative, second and third lenses: positive, fourth and fifth lenses: negative, sixth lens: positive). By controlling these optical parameters and arranging them in a specific sequence, the system achieves tolerance to assembly variations, making manufacturing easier while maintaining imaging quality
3Ease of manufacture
If existing micro-projection lens designs are used, then optical imaging function is achieved, but production cost increases
Solution Approach 1:
The patent specifies particular focal power ranges and material properties for each lens element that balance manufacturing cost with optical performance. By optimizing these parameters, the design achieves reliable imaging quality while reducing production costs compared to more complex existing designs
4Reliability
If existing micro-projection lens designs are used, then optical imaging is achieved, but aberration occurs
Solution Approach 1:
Different lens elements are assigned specific local optical properties: the first lens has negative focal power to diverge light, the second and third lenses have positive focal power to converge light, the fourth and fifth lenses have negative focal power, and the sixth lens has positive focal power. This local differentiation of optical properties across the six elements enables correction of various aberrations while maintaining high imaging quality
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 small size, high imaging quality, low distortion, and reduced production costs by minimizing the number of lenses and using aspheric and glass materials effectively, while maintaining excellent optical performance.
Implementation Method 1
a first lens, a first glued lens, a second glued lens and a sixth lens, the first lens has a negative focal power; the first glued lens comprises a second lens and a third lens... the first glued lens has a positive focal power
Data Source
AI summary
A projection lens, comprising: a first lens, a first glued lens, a second glued lens and a sixth lens, the first lens has a negative focal power; the first glued lens comprises a second lens and a third lens, the second lens is located between the first lens and the third lens, the second lens and the third lens are glued to each other on opposing surfaces thereof, and the first glued lens has a positive focal power; the second glued lens comprises a fourth lens and a fifth lens, the fourth lens is located between the third lens and the fifth lens, the fourth lens and the fifth lens are glued to each other on opposing surfaces thereof, and the second glued lens has a negative focal power; the sixth lens has a positive focal power.