UV Projection Lens with Segmented Spherical and Aspheric Sets
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Solution Overview
Problem
There is a need for an optical lens that provides effective imaging or image-capture effects with minimal distortion in the ultraviolet wavelength band, as existing lenses are not optimized for this range.
Innovation Solution
A projection lens design comprising a first lens set with 4 to 6 spherical lenses of negative refractive power and a second lens set with 4 to 6 lenses, including an aspheric lens of positive refractive power, separated by a minimum inner diameter of the lens barrel, ensuring a transmittance of at least 75% at 365 nm, thereby addressing the ultraviolet wavelength band requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lenses are used for ultraviolet wavelength band, then the lens structure is simple, but the transmittance and imaging quality are insufficient
Solution Approach 1:
The projection lens is divided into multiple lens sets (first lens set with negative refractive power and second lens set with positive refractive power), where each set contains multiple individual lenses. This segmentation allows optimization of each lens for specific ultraviolet wavelength transmission while managing overall system complexity through modular design.
Solution Approach 2:
Different lenses within the lens sets have different refractive powers and optical properties tailored for ultraviolet wavelengths. The first lens set uses negative refractive power lenses and the second lens set uses positive refractive power lenses, with at least one aspheric lens, creating local optimization for UV transmittance and imaging quality across different regions of the optical path.
2Reliability
If multiple lens sets are used to improve transmittance, then the optical performance improves, but the device complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges: the first lens set has negative refractive power and the second lens set has positive refractive power, with at least one aspheric lens included. These parameter specifications optimize ultraviolet transmittance while controlling complexity through defined design constraints rather than unlimited lens combinations.
3Ease of manufacture
If spherical lenses are used, then the manufacturing is easier, but the optical distortion increases
Solution Approach 1:
The patent employs a hybrid approach where most lenses are spherical (easier to manufacture) but at least one lens in the second lens set is aspheric (reduces distortion). This local application of aspheric design where most critical for image quality balances manufacturing ease with optical precision, improving distortion control without requiring all lenses to be complex aspheric surfaces.
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 lens configuration achieves high transmittance and reduced optical distortion, making it suitable for ultraviolet applications with minimal distortion and improved optical performance.
Implementation Method 1
The first lens set includes 4 to 6 spherical lenses, and a refractive power of the first lens set is negative. The second lens set includes 4 to 6 lenses, where one of the lenses is an aspheric lens, and a refractive power of the second lens set is positive.
Data Source
AI summary
The disclosure provides a projection lens including a first lens set and a second lens set disposed sequentially from a magnified side to a reduced side. The first lens set and the second lens set are separated by a minimum inner diameter of a lens barrel. The first lens set includes 4 to 6 spherical lenses, and a refractive power of the first lens set is negative. The second lens set includes 4 to 6 lenses, where one of the lenses is an aspheric lens, and a refractive power of the second lens set is positive. A transmittance of the projection lens at a wavelength of 365 nm is greater than or equal to 75%.