Resin Lens UV Reducer for Viewfinder Detection
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Solution Overview
Problem
Conventional optical systems with high-dispersion resin lenses for line-of-sight detection suffer from inferior UV light resistance and increased infrared reflectance, which compromises detection accuracy in viewfinder systems using infrared light.
Innovation Solution
An optical system comprising a resin lens and a UV light reducer, where the UV light reducer is positioned closer to the viewer, with specific transmittance and reflectance characteristics (0 < Tuv < 100 and 0 < Rir < 10) to enhance UV light reduction and minimize infrared reflectance, ensuring high reliability and detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-dispersion resin lens is used to achieve high optical performance, then optical performance is improved, but UV light resistance deteriorates
Solution Approach 1:
The patent combines a resin lens with a UV light reducer in a composite optical system. The resin lens provides high optical performance including high dispersion, while the UV light reducer (positioned closer to the viewer) provides UV protection, creating a composite material solution that achieves both high optical performance and UV resistance.
Solution Approach 2:
The UV light reducer acts as an intermediary element between the resin lens and the viewer's eye. It is positioned closer to the viewer than the resin lens and selectively blocks UV light while maintaining transparency in the visible and infrared regions, thus protecting the resin lens from UV degradation without affecting optical performance.
2Reliability
If a UV light reducer is added to protect the resin lens, then UV light resistance is improved, but infrared reflectance increases
Solution Approach 1:
The UV light reducer is designed with wavelength-selective properties: it blocks UV light (300-360 nm) while being transparent in the visible and infrared regions. This local quality differentiation allows it to provide UV protection without increasing infrared reflectance, as the coating properties are optimized for specific wavelength ranges.
Solution Approach 2:
The patent specifies precise parameter ranges for the UV light reducer: UV transmittance of 5-50% at 300-360 nm, and infrared reflectance of 0-10% at 700-1000 nm. By controlling these parameters, the system achieves UV protection while maintaining low infrared reflectance for accurate line-of-sight detection.
3Reliability
If the UV light reducer is positioned closer to the viewer, then UV protection effectiveness is improved, but the optical path complexity increases
Solution Approach 1:
The optical system is segmented into distinct functional elements: the resin lens for optical focusing and the UV light reducer for UV protection. By positioning the UV light reducer separately closer to the viewer, the system achieves effective UV protection without significantly complicating the overall optical path, as each element performs its specific function independently.
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 achieves excellent line-of-sight detection performance and high optical reliability by maintaining low UV transmission and reduced infrared reflectance, preventing ghost light and improving visibility in viewfinder systems.
Implementation Method 1
a member for reducing transmission of ultraviolet light of the optical system
Implementation Method 2
capturing a reflected image so as not to cause discomfort to the viewer
Data Source
AI summary
An optical system configured to guide an image displayed on a display element to an eyeball of a viewer includes a resin lens, and a member for reducing transmission of ultraviolet light of the optical system. The member is disposed closer to the viewer than the resin lens. Predetermined inequalities are satisfied.