Flashlight Reflector Focusing Mechanism and Uniform Wall Design
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Solution Overview
Problem
Existing flashlights have complex designs with numerous components, leading to increased manufacturing costs and reduced durability, and often suffer from distortion in reflector surfaces due to non-uniform shrinkage during production, affecting the quality of the light beam.
Innovation Solution
A simplified flashlight design with fewer components, where the reflector is configured with uniform thickness to minimize distortion and the light source remains stationary while the reflector moves relative to it for focusing, using a spiral groove and tab arrangement or threads for focusing, and incorporating a heat sink for heat management and electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of component parts is increased to provide focusing features, then the focusing functionality is improved, but the manufacturing cost and device complexity increase
Solution Approach 1:
The reflector is integrated with the head assembly housing, eliminating the need for separate reflector mounting components. The focusing feature is achieved by rotating the head assembly itself, which moves the integrated reflector relative to the light source, rather than using separate focusing mechanisms with multiple parts.
Solution Approach 2:
The head assembly serves multiple functions: it houses the light source, integrates the reflector, provides the focusing mechanism through rotation, and structures the overall front end of the flashlight. This multi-functionality reduces the total number of components needed.
2Ease of manufacture
If the reflector walls are made with non-uniform thickness to accommodate manufacturing processes, then the manufacturing is easier, but the reflector surface becomes distorted affecting light beam quality
Solution Approach 1:
The reflector is designed with uniform wall thickness throughout, creating consistent local properties that prevent distortion during manufacturing. This uniform geometry ensures that the injection molding process produces a uniformly thick reflector wall, maintaining surface quality and light beam integrity.
3Adaptability or versatility
If the light source is moved relative to the reflector for focusing, then the focusing mechanism is achieved, but the number of component parts and assembly complexity increase
Solution Approach 1:
Instead of moving the light source relative to a stationary reflector (conventional approach), the invention inverts the approach by keeping the light source stationary and moving the reflector through rotation of the head assembly. This inversion simplifies the mechanical design and reduces component complexity.
4Illumination intensity
If larger and more powerful light sources are used to provide brighter beams, then the illumination intensity is improved, but the heat generation increases requiring additional heat management components
Solution Approach 1:
The heat sink is integrated with the light source module, combining thermal management functionality with the light source housing. This integration eliminates the need for separate heat sink components while effectively managing the heat generated by high-power LEDs, maintaining bright illumination without excessive heat buildup.
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 reduces manufacturing costs, enhances durability, and improves the quality of the light beam by minimizing distortion and allowing quicker focusing with reduced wear on components.
Implementation Method 1
Many, if not most, current lighting devices use a reflector to direct the beam of light
Implementation Method 2
incorporating a heat sink for heat management
Data Source
AI summary
Improved lighting devices, such as non-rechargeable and rechargeable flashlights, having simplified designs with fewer component parts are described. A focusing feature is described where the light source is held stationary and the reflector is moved through the engagement of threads and/or teeth arrangement. An improved reflector that avoids regions of increased thickness to reduce or avoid distortion caused by sink is also described.