Hand-Power Tool Lighting Unit Shadow Reduction
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Solution Overview
Problem
Hand-held power tools with high rotational speed tool spindles require effective lighting solutions that provide uniform illumination without shadows, while also allowing for easy mounting and operation, including delayed lighting to facilitate workpiece viewing between processes.
Innovation Solution
The lighting unit is arranged around the tool spindle at an angle of less than 125 degrees, with optical elements for scattering light beams to reduce shadows and a delay unit that continues illumination after the drive unit is switched off, using light-emitting diodes that can emit different colors and integrate with the tool's housing for structural simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lighting means are arranged around the tool spindle, then illumination uniformity is improved, but shadow formation increases
Solution Approach 1:
The lighting unit is divided into multiple lighting means (at least two, preferably three or more) arranged at different angular positions around the tool spindle. Each lighting means emits light from a different direction, segmenting the illumination source to reduce shadows cast by the tool and workpiece.
Solution Approach 2:
Optical elements are integrated at specific locations within the lighting unit to modify light propagation locally. These optical elements scatter light beams in specific directions to fill shadow areas, creating local quality variations in the illumination pattern to achieve more uniform overall lighting.
2Object-affected harmful factors
If lighting means are arranged at specific angles, then shadow reduction is improved, but device complexity increases
Solution Approach 1:
Multiple lighting means and optical elements are merged into a single integrated lighting unit that surrounds the tool spindle. This combining of multiple components into one unified structure simplifies mounting and reduces the overall number of separate parts, thereby reducing device complexity while maintaining shadow reduction capabilities.
Solution Approach 2:
The lighting unit serves multiple functions simultaneously: it provides illumination from multiple angles to reduce shadows, integrates optical elements for light scattering, and can be mounted in a standardized manner around the tool spindle. This multi-functionality reduces the need for separate components, simplifying the overall device.
3Ease of operation
If delay unit is added for extended illumination, then workpiece viewing comfort is improved, but energy consumption increases
Solution Approach 1:
The delay unit is configured to extend illumination for a predetermined time period after the drive unit is switched off. This preliminary extension of lighting allows the operator to continue viewing the workpiece comfortably during transitions between operations, ensuring adequate lighting before complete shutdown.
Solution Approach 2:
The lighting operation is divided into two distinct phases: the primary illumination phase during active operation, and the delayed illumination phase after shutdown. This periodic action pattern allows energy-consuming illumination to be concentrated when needed, with the delay phase being a controlled, limited extension rather than continuous operation.
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 ensures uniform and shadow-free illumination, allowing comfortable workpiece processing with easy mounting and extended visibility during transitions, enhancing operational efficiency and safety.
Implementation Method 1
The lighting means is preferably embodied as a lighting means which appears appropriate to the person skilled in the art, but preferably as a light emitting diode. The lighting unit preferably has at least one light emitting diode which emits a white light.
Implementation Method 2
The lighting unit has at least one optical element which is provided for scattering a light beam of at least one of the lighting means, as a result of which illumination can be achieved which is particularly low in shadows and uniform.
Data Source
AI summary
A hand-power tool includes at least one tool spindle and a drive unit configured to drive the tool spindle at a rotational speed greater than 10,000 min−1. The hand-power tool further includes at least one lighting unit that has at least two lighting mechanisms that are configured to illuminate a work area. The lighting mechanisms are arranged on an axial plane of the tool spindle at an angle of less than 125 degrees relative to each other with respect to the tool spindle.