Flexible Dome Switch with Sequential Actuation for Flashlight Reliability
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Solution Overview
Problem
Conventional mechanical switches, such as clicker switches, are unreliable and prone to failure, which can compromise the functionality of flashlights used in critical applications, especially in emergency and professional settings, due to their mechanical complexity and high cost of replacement.
Innovation Solution
An electrical switch design featuring a flexible dome with multiple legs and a pushbutton mechanism that provides a long stroke and tactile feedback, allowing for sequential switching functions with reduced mechanical complexity and increased reliability, utilizing a flexible dome with different actuation forces for distinct switch contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional clicker switch mechanism is used, then the switch provides tactile feedback and long stroke actuation, but the mechanical complexity increases and reliability decreases
Solution Approach 1:
The patent replaces the mechanical clicker switch mechanism with an electronic switching system. A pushbutton activates a momentary switch that controls an electronic latching circuit, which in turn controls the flashlight's operation. This substitution eliminates the mechanical ratcheting mechanism while preserving the long stroke actuation and tactile feedback through the pushbutton design.
Solution Approach 2:
The electronic latching circuit serves multiple functions: it latches the ON state when the pushbutton is pressed, automatically turns OFF when battery voltage drops below a threshold, and can be reactivated by another pushbutton press. This multi-functionality replaces the mechanical ratcheting while maintaining reliable operation.
2Adaptability or versatility
If a conventional clicker switch mechanism is used, then the switch provides sequential switching functions, but the device complexity increases
Solution Approach 1:
The patent replaces the mechanical sequential switching mechanism with an electronic control system. The momentary switch connects to a latching circuit that sequentially manages different operating states (OFF, ON, low-voltage shutdown). This electronic approach achieves the same sequential functionality with reduced mechanical complexity.
Solution Approach 2:
The electronic latching circuit dynamically adapts its behavior based on battery voltage levels and pushbutton actuation. It automatically transitions between latched and unlatched states, and between normal operation and low-voltage shutdown, providing sequential control without mechanical moving parts.
3Ease of manufacture
If a conventional clicker switch is used, then the switch is inexpensive, but the cost of replacing the flashlight increases when the switch fails
Solution Approach 1:
The patent replaces the mechanical clicker switch with an electronic switching system consisting of a simple momentary switch and an electronic latching circuit. The momentary switch is inherently simpler and more reliable than a mechanical clicker, and the electronic circuit provides additional reliability through automatic voltage monitoring and controlled shutdown sequences.
Solution Approach 2:
The patent uses a simple, inexpensive momentary switch instead of a complex mechanical clicker switch. While the momentary switch has a simpler mechanism, the overall system achieves better reliability through the electronic latching circuit that protects against premature failure and provides controlled 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
The solution provides a reliable and user-friendly switching mechanism with tactile feedback, reducing the risk of failure and extending the lifespan of flashlights by simplifying the switch design and enhancing user control over the actuation process.
Implementation Method 1
a spring extending from the base for providing an electrical connection to at least one of the first, second and third electrical conductors of the base
Implementation Method 2
an electrically conductive flexible dome disposed in the cavity of the housing cover, the flexible dome having a plurality of relatively longer legs extending from a dome portion thereof and being in electrical contact with the first electrical conductor of the base, the flexible dome having a relatively shorter leg extending from the dome portion thereof and overlying the second electrical conductor of the base, and the dome portion of the flexible dome overlying the third electrical conductor of the base, the flexible dome having an actuation distance, wherein the relatively shorter leg of the flexible dome comes into electrical contact with the second electrical conductor when the flexible dome is pressed with a first actuation force, and wherein the dome portion of the flexible dome comes into electrical contact with the third electrical conductor when the flexible dome is pressed with a second actuation force
Data Source
AI summary
An electrical switch and a flashlight employing the switch may comprise a base having three electrical conductors thereon and an electrically conductive flexible dome adjacent the base. The flexible dome has plural longer legs extending from its dome and in electrical contact with a first conductor, has a shorter leg extending from its dome and overlying a second conductor, and has its dome overlying a third conductor. A spring may extend from the base of the switch. A pushbutton may be moved to apply sufficient force to cause the shorter leg to contact the second conductor and the dome to contact the third conductor. A spring may be between the pushbutton and the flexible dome to couple force to the flexible dome.