Power Tool COB Light Positioning to Eliminate Shadows
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Solution Overview
Problem
Power tools often create shadows on the work object due to the tool accessory being in the illumination path, and low light intensity makes it difficult for users to visually perceive the work object during operation.
Innovation Solution
A power tool design featuring a COB light disposed on the battery-holding part, with LED devices installed spaced apart to cancel out shadows and provide high-intensity illumination, using an optical member made of polycarbonate resin with a white diffusing agent to improve aesthetics and light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light unit illuminates the work object, then visibility is improved, but shadows are created on the work object due to the tool accessory being in the illumination path
Solution Approach 1:
The patent positions the light unit in the battery-holding part at the rear of the power tool, changing the illumination direction from the front (where shadows would be created) to the rear. This dimensional change in light source positioning allows light to illuminate the work object from behind the tool accessory, eliminating shadow formation while maintaining visibility.
2Illumination intensity
If the luminous intensity of the light is increased to improve visibility, then the work object becomes more visible, but the design aesthetics are compromised
Solution Approach 1:
The patent employs a diffuser that selectively scatters light only in the forward direction toward the work object, while maintaining a sleek external appearance. This local quality approach allows the light unit to provide high illumination intensity where needed (forward direction) while preserving design aesthetics on the external surfaces of the power tool.
Solution Approach 2:
The diffuser acts as an intermediary element between the high-intensity light source and the external environment. It transmits and directs light forward to illuminate the work object while diffusing and softening the light output, and simultaneously concealing the bright light source from external view, thus maintaining design aesthetics.
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 ensures brighter illumination of the work object, reduces shadow formation, and enhances user visibility during power tool operations, while maintaining improved design aesthetics.
Implementation Method 1
a COB light, which is disposed on the battery-holding part
Implementation Method 2
an optical member made of polycarbonate resin with a white diffusing agent
Data Source
AI summary
A power tool (1; 101) includes: a motor (6; 106) having a stator (61) and a rotor (63), which is rotatable relative to the stator; an output part (8; 108) disposed more forward than the motor and configured to be rotated by the motor; a motor-housing part (21; 121), which houses the motor; a grip part (22; 122) disposed downward of the motor-housing part; a battery-holding part (23; 123) disposed downward of the grip part; and a COB light (50) disposed on the battery-holding part.