Sight Device Light Guide Spectral Tuning
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Solution Overview
Problem
Existing sight devices require large and complex radioluminescent light sources to achieve sufficient brightness for target marks at night or dusk, due to inefficient conversion of light into fluorescent light, which is space-consuming and costly.
Innovation Solution
A sight device design where the center wavelength of the radioluminescent light source is greater than the center wavelength of the photoluminescent material in the light guide, allowing a significant portion of the radioluminescent light to pass through without conversion, and ambient light is converted into photoluminescent light to illuminate the target mark, optimizing brightness and reducing space and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a radioluminescent light source with greater light intensity is selected to achieve sufficient brightness for the target mark at night or dusk, then the brightness of the target mark is improved, but the cost and space required increase
Solution Approach 1:
The patent changes the spectral parameters of the radioluminescent light source by selecting materials with specific emission spectra that overlap with the absorption spectrum of the photoluminescent material. This parameter optimization enables efficient energy transfer and reduces the need for high-intensity light sources, thereby reducing space and cost while maintaining brightness
Solution Approach 2:
The patent employs composite material selection by combining specific photoluminescent materials (such as zinc sulfide with copper and aluminum) with radioluminescent light sources (such as tritium) that have matching spectral characteristics. This composite approach maximizes conversion efficiency and reduces the required light source intensity, solving the contradiction between brightness and device complexity
2Loss of energy
If the absorption spectrum of the photoluminescent material and the emission spectrum of the radioluminescent light source are optimized for maximum overlap, then the conversion efficiency is improved, but the color temperature and visibility to the human eye may be compromised
Solution Approach 1:
The patent optimizes spectral parameters by selecting photoluminescent materials with absorption peaks in the blue-violet range (450-480 nm) and matching radioluminescent light sources with emission peaks in the same range. This parameter alignment maximizes conversion efficiency while the photoluminescent material converts this energy to green light (500-560 nm), which is highly visible to the human eye
Solution Approach 2:
The patent utilizes color transformation through photoluminescence conversion. The radioluminescent light source emits blue-violet light which is absorbed by the photoluminescent material and re-emitted as green light. This color change optimizes both conversion efficiency (through spectral matching) and visibility (by converting to green, the most visible wavelength range for human eyes)
Data Source
AI summary
The invention relates to a sight device (1), in particular a reflector sight or telescopic sight, which sight device has a lighting apparatus (2) for producing or illuminating a target mark, wherein the lighting apparatus (2) comprises an light guide (3) made of photoluminescent, in particular fluorescent material and a radioluminescent light source (7) coupled to the light guide (3), wherein the light guide (3) is designed to receive ambient light and convert said ambient light into photoluminescence light along at least one segment (4) of the longitudinal extent of the light guide, and wherein the absorption spectrum (10) of the photoluminescent material of the light guide (3) and the emission spectrum (9) of the radioluminescent light source (7) in the visible range can both be characterized by a spectral bandwidth and a center wavelength. In order to increase the luminance of the lighting apparatus and thus the visibility of the target mark, the center wavelength of the emission spectrum (9) of the radioluminescent light source (7) is greater than the center wavelength of the absorption spectrum (10) of the photoluminescent material of the light guide (3).