Weapon Sight Reticle Illumination Using Tritium and Beam Splitter
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Solution Overview
Problem
Existing techniques for illuminating reticles in weapon sights are not satisfactory in all environments, particularly in low-light conditions and when ambient light sources are limited.
Innovation Solution
The use of a tritium light source combined with lenses and a beam splitter, or a fluorescent fiber, or an LED, to provide continuous and reliable illumination, with the tritium light source offering long-term operation without batteries and the additional components enhancing brightness and adaptability to different light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light source is used to illuminate the reticle, then the reticle visibility is improved, but the device complexity increases due to additional components like lenses and beam splitters
Solution Approach 1:
The patent embeds the light source within the existing optical path of the weapon sight, nesting the illumination components (light source, lens, beam splitter) within the housing that already contains the objective lens and eyepiece. This allows the illumination system to be integrated into the existing structure rather than adding a separate external illumination device, thereby improving reticle visibility while minimizing the increase in overall device complexity.
Solution Approach 2:
The patent introduces a beam splitter as an intermediary component that divides the optical path into two channels: one for the main viewing path through the objective lens and eyepiece, and another for the illumination path from the light source to the reticle. This intermediary element allows both illumination and viewing functions to coexist within the same optical system without interfering with each other, resolving the contradiction between improved illumination and device complexity.
2Reliability
If ambient light sources are relied upon for reticle illumination, then the device complexity is reduced, but the reliability of reticle visibility deteriorates in low-light conditions
Solution Approach 1:
The patent employs a tritium-based light source that is self-powered through radioactive decay, eliminating the need for batteries or external power sources. The tritium capsule generates light autonomously for extended periods (typically 10-20 years), providing reliable reticle illumination in low-light conditions without requiring complex power management systems, thus achieving high reliability with minimal device complexity.
Solution Approach 2:
The patent changes the fundamental parameter of light generation from external ambient light dependence to internal radioactive luminescence. By utilizing the radioactive decay of tritium to produce continuous light emission, the system maintains reliable reticle visibility across varying environmental light conditions without requiring complex sensors, switches, or power management circuitry that would increase device complexity.
3Duration of action of moving object
If a tritium light source is used, then the duration of operation is extended without batteries, but the manufacturing precision requirements increase due to handling radioactive materials
Solution Approach 1:
The patent encapsulates the radioactive tritium gas within a hermetically sealed glass capsule with a phosphor-coated inner surface. This flexible shell structure contains the radioactive material in a compact, safe, and transportable form while allowing the beta particles to interact with the phosphor coating to produce visible light. The capsule design simplifies manufacturing by providing a self-contained unit that requires minimal precision handling during assembly, as the entire light-generating mechanism is pre-assembled and sealed as a single component.
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 provides consistent and enhanced reticle illumination across various environments, leveraging the long lifespan of tritium and the adaptability of additional light sources to ensure visibility in both low-light and UV-rich conditions.
Implementation Method 1
The use of a tritium light source combined with lenses and a beam splitter, or a fluorescent fiber, or an LED, to provide continuous and reliable illumination, with the tritium light source offering long-term operation without batteries
Implementation Method 2
causing light from a light source to pass through a lens portion and to then illuminate the reticle
Implementation Method 3
The use of a tritium light source combined with lenses and a beam splitter, or a fluorescent fiber, or an LED, to provide continuous and reliable illumination
Data Source
AI summary
A weapon sight has an optical system that causes first radiation to propagate along a path of travel within the sight, and has a reticle generating portion that causes second radiation representing a reticle to propagate along the path of travel with the first radiation. The reticle generating portion includes a reticle illuminating portion that illuminates the reticle, and the reticle illuminating portion includes a light source and a lens portion. Light from the light source passes through the lens portion, and then illuminates the reticle.