Electric Work Machine Light Unit Asymmetric LED Placement
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Solution Overview
Problem
Lighting systems in power tools, such as those using chip-on-board LEDs, often experience reduced light emission performance when subjected to shocks, leading to potential failures in critical work environments.
Innovation Solution
The design of an electric work machine incorporates a light unit with LED emitters positioned on a substrate at intervals in the circumferential direction, where the LED nearest the apex is shifted by a predetermined angle, and a light shield to minimize glare and enhance shock resistance, ensuring consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light unit is positioned at the apex of the substrate for optimal illumination, then the illumination performance is improved, but the light unit becomes more susceptible to shock damage when the tool falls
Solution Approach 1:
The patent applies asymmetry by deliberately offsetting the light unit from the apex position of the substrate. Instead of placing the light unit at the highest point (apex) where it would provide optimal illumination, the light unit is positioned at a location shifted by a predetermined angle. This asymmetric placement reduces the concentration of stress at the apex during impact, thereby improving shock resistance while maintaining adequate illumination performance.
2Illumination intensity
If multiple light emitters are arranged in a circular pattern for uniform illumination, then the illumination coverage is improved, but the structure becomes more complex and vulnerable to simultaneous failure
Solution Approach 1:
The patent applies segmentation by dividing the illumination function into multiple discrete light emitters arranged in a circular pattern around the output unit. Each light emitter is independently mounted on the substrate, allowing the illumination function to be distributed across multiple separate components. This segmentation provides uniform illumination coverage while enabling individual replacement or repair of failed emitters, reducing the impact of single-point failures.
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
This configuration reduces the likelihood of light unit failure upon impact, maintaining light emission performance and reducing glare for the operator, thus ensuring reliable illumination during tool operation.
Implementation Method 1
a plurality of light emitters mounted on a front surface of the substrate at intervals in a circumferential direction of the output unit
Data Source
AI summary
A light unit is less likely to have lower light emission performance upon receiving a shock. An electric work machine includes a motor, a housing including a motor compartment accommodating the motor and a grip protruding downward from the motor compartment, an output unit located frontward from the motor and operable with a rotational force from the motor, a substrate extending above, on a left, and on a right of the output unit, and a plurality of light emitters mounted on a front surface of the substrate at intervals in a circumferential direction of the output unit. A light emitter of the plurality of light emitters nearest an apex of the substrate immediately above the output unit is at a position shifted circumferentially by a predetermined angle from the apex.