Handheld Rotary Tool Light Emission Circuit
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Solution Overview
Problem
Existing rotary tools lack effective ergonomic tool-mounted task lighting, making it difficult for users to perform tasks in less-than-ideal lighting conditions.
Innovation Solution
A light-emission circuit for a handheld rotary tool, comprising multiple nodes and branches, including a light emitting diode (LED) array and a transistor array, which provides controlled and ergonomic lighting by illuminating LEDs when the electric motor is engaged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional overhead lighting is used, then general illumination is provided, but direct lighting on the workpiece is insufficient in difficult locations
Solution Approach 1:
The patent combines the lighting function with the rotary tool by mounting the LED array directly on the tool body, integrating two separate functions (tool operation and illumination) into a single unified system. This allows the tool to provide both mechanical work and direct lighting on the workpiece simultaneously, eliminating the need for separate overhead lighting.
Solution Approach 2:
The patent introduces a control circuit as an intermediary between the power source and the LED array, which includes components like capacitors, diodes, and transistor arrays to regulate and control the lighting function. This intermediary system enables precise control over when and how the LED illuminates, optimizing the lighting effect while managing power consumption.
2Illumination intensity
If tool-mounted LED lighting is added, then direct illumination on workpiece is improved, but circuit complexity increases
Solution Approach 1:
The control circuit is designed to automatically control the LED lighting based on the operational state of the rotary tool. When the motor is engaged, the LED illuminates automatically without requiring separate user intervention or complex control mechanisms. The circuit serves itself by using the motor's operational status as the control signal for lighting activation.
Solution Approach 2:
The patent extracts the lighting control function into a separate, dedicated control circuit with specific components (capacitors, diodes, transistor arrays) that can be independently designed and optimized. This separation allows the lighting system to be controlled through specialized electronic components rather than integrating complex control logic into the main tool circuitry.
3Illumination intensity
If LED array is continuously powered, then constant illumination is provided, but energy consumption increases
Solution Approach 1:
The patent implements periodic or conditional action by designing the control circuit to activate the LED array only during specific periods when the motor is engaged. The lighting is not continuously powered but rather switches on and off based on the operational state, reducing energy consumption during idle periods while maintaining illumination when needed.
Solution Approach 2:
The control circuit uses feedback from the motor's operational state to control the LED lighting. The circuit monitors whether the motor is engaged or disengaged and automatically adjusts the lighting accordingly, creating a closed-loop system that optimizes energy consumption based on actual operational needs rather than continuous power supply.
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 direct and controllable lighting to the workpiece, enhancing user visibility and comfort during operation, regardless of ambient lighting conditions.
Implementation Method 1
The light emitting element may comprise one or more light emitting diodes (LEDs)
Implementation Method 2
The second node is separated from the first node by a capacitor
Implementation Method 3
a diode restricting current flow between the first node and the third node
Implementation Method 4
The transistor array may comprise one or more bipolar junction transistors (BJTs)
Data Source
AI summary
A rotary tool having a light-emitting element and a control circuit for the light-emitting element. The light-emitting element may comprise one or more light emitting diodes at least partially disposed within a nosecap of the rotary tool. Control of the illumination of the light-emitting element may be accomplished according to a method of operating the control circuit.