Actuator Coil Holder Case Design for Drop Impact Resistance
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Solution Overview
Problem
Existing actuators face issues with drop impact resistance, as the power supply board is prone to movement and coil wire cutting when subjected to impacts, leading to reduced durability in devices like remote controllers or game controllers.
Innovation Solution
The actuator design incorporates a coil holder that covers the power supply board and is connected to a case, with viscoelastic connecting bodies and an abutting portion to absorb impacts, preventing direct transmission of force to the power supply board and reducing coil wire tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the power supply board is fixed to the case so as to protrude from the case, then the power supply board is easily accessible, but the coil wire is easily pulled and cut near the soldered position when the actuator is dropped
Solution Approach 1:
The patent introduces a flexible cable as an intermediary component between the power supply board and the external connection point. This flexible cable acts as a mediator that can absorb impact forces and accommodate relative movement, preventing the rigid transmission of impact forces that would otherwise cause the coil wire to be pulled and cut at the soldered position.
Solution Approach 2:
The patent changes the physical state and properties of the connection structure by using a flexible cable with specific material properties (elasticity, flexibility) instead of a rigid fixed connection. This parameter change allows the connection to dynamically adapt to impact forces and movement, protecting the soldered joint from excessive stress.
2Reliability
If the power supply board is held by the coil holder covered with the case, then drop impact resistance is improved, but the power supply board becomes less accessible
Solution Approach 1:
The patent employs a nested structure where the power supply board is held by the coil holder, which is in turn covered by the case. This nested arrangement provides progressive protection: the coil holder holds the board securely, while the case covers and protects the coil holder, creating multiple layers of protection against impact forces.
Solution Approach 2:
The case acts as a protective shell that provides beforehand cushioning against impact forces. By covering the coil holder and power supply board before any impact occurs, the case prevents direct transmission of impact forces to these components, thereby improving drop impact resistance.
3Adaptability or versatility
If the coil wire is made longer to connect the coil to the power supply board, then flexibility is improved, but the wire is more prone to cutting during impact
Solution Approach 1:
The flexible cable serves as an intermediary that provides both the necessary flexibility for routing and the strength to resist cutting. By using a specialized flexible cable with appropriate material properties and construction, the system achieves both adaptability in routing and resistance to impact-induced cutting.
Solution Approach 2:
The flexible cable likely employs composite construction with multiple layers or materials that provide both flexibility and strength. This composite approach allows the cable to bend and flex as needed while maintaining sufficient tensile strength to resist cutting during impact events.
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 significantly enhances drop impact resistance by minimizing coil wire cutting and improving the overall durability of the actuator, allowing it to withstand drops without damaging the coil wires.
Implementation Method 1
a magnetic driving circuit including a coil provided in the support body and a permanent magnet provided in the movable body so as to face the coil in the first direction, the magnetic driving circuit causing the movable body to vibrate with respect to the support body in a second direction which intersects with the first direction
Implementation Method 2
a connecting body having at least one of elasticity and viscoelasticity, and is disposed to be in contact with both the movable body and the support body
Data Source
AI summary
An actuator may include a movable body; a support body; a connecting body disposed in contact with both the movable body and the support body in a position in which the movable body and the support body face each other; and a magnetic driving circuit including a coil in the support body and a permanent magnet in the movable body. The magnetic driving circuit may cause the movable body to vibrate. The support body may include a coil holder that holds the coil, a case that covers a circumference of the movable body and the coil holder, and a power supply board held by the coil holder in a position exposed from the case and to which a coil wire forming the coil is connected.