Trigger Switch Spring Layout for Compact Size and Tactile Stroke
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Solution Overview
Problem
Existing trigger switches face challenges in miniaturization without compromising operation feeling, particularly due to the need to shorten the compression coil spring, leading to issues with depression sensing and fine-tuning the push operation.
Innovation Solution
The trigger switch design incorporates an energizing member, such as a compression coil spring, with one end outside the housing and the other end fixed inside, maintaining a sufficient length for expansion and contraction, ensuring a sufficient stroke length and operation feeling while allowing miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the housing is made smaller for miniaturization, then the size of the electric device is reduced, but the compression coil spring must be shortened which degrades operation feeling and depression sensing capability
Solution Approach 1:
The energizing member is repositioned to extend from the front surface of the trigger toward the rear, with one end located outside the housing and the other end fixed inside the housing. This spatial reconfiguration allows the energizing member to maintain sufficient length for proper operation feeling while enabling the housing to be miniaturized in other dimensions.
2Volume of moving object
If the compression coil spring is shortened to fit a smaller housing, then the housing size is reduced, but the stroke length and fine-tuning capability are compromised
Solution Approach 1:
The energizing member is configured to extend in the push operation direction from the front surface toward the rear of the trigger, with one end positioned outside the housing and the other end fixed inside the housing. This dimensional arrangement preserves sufficient stroke length while allowing housing miniaturization.
3Volume of moving object
If the energizing member is positioned entirely inside the housing, then the housing can be compact, but the trigger cannot receive sufficient energizing force for proper operation
Solution Approach 1:
The energizing member is divided into two functional segments: one end located outside the housing to provide energizing force to the trigger, and the other end fixed inside the housing to anchor the energizing member. This segmentation allows both compact housing and sufficient energizing force.
Solution Approach 2:
The energizing member acts as an intermediary element that transmits force between the trigger and the housing structure. By positioning one end outside and one end inside the housing, it mediates between the need for compact size and the need for sufficient energizing force.
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 achieves a compact size without sacrificing operation feeling, enabling fine adjustment and ensuring a sufficient stroke length in the push operation, suitable for incorporation into devices with thin handheld portions.
Implementation Method 1
an energizing member that energizes the trigger in an opposite direction to the push operation at one end side located outside the housing, and has other end side fixed inside the housing
Data Source
AI summary
A trigger switch includes: a housing, housed in a main unit; a trigger, accepting a push operation with a part located outside the housing, and moving when pushed by the push operation and when the push operation is released; and an energizing member, energizing the trigger in an opposite direction to the push operation, and is capable of being incorporated into the main unit. The energizing member energizes the trigger in an opposite direction to the push operation at one end side located outside the housing, and has other end side fixed inside the housing.