Vibration Actuator Coil Positioning Without a Resin Holder
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Solution Overview
Problem
Conventional actuators face limitations in increasing the size of the coil due to the use of resin coil holders, which restricts acceleration and vibration generation, and require accurate positioning of the coil when reducing actuator size for enhanced driving force.
Innovation Solution
The actuator design fixes the coil to a metal first plate, utilizing a metal case with cutout concave portions and curved protrusions for precise positioning, eliminating the need for a resin holder, and ensuring accurate alignment of the coil and magnet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a resin coil holder is used to position the coil, then the coil can be positioned and fixed, but the outer size of the actuator increases and the coil size is limited
Solution Approach 1:
The invention extracts and eliminates the resin coil holder from the actuator structure. Instead of using a separate resin holder component, the coil positioning function is integrated directly into the metal plate through precisely formed cutout concave portions and curved protrusions, thereby reducing the overall actuator size while maintaining positioning accuracy.
Solution Approach 2:
The invention merges the coil positioning and support functions into the metal plate structure itself. The metal plate incorporates cutout concave portions and curved protrusions that directly position and support the coil, eliminating the need for a separate resin holder and integrating multiple functions into a single component.
2Force
If the coil size is increased to generate larger vibrations, then the vibration generation improves, but the actuator outer size must be made large
Solution Approach 1:
By removing the resin holder constraint, the invention enables direct integration of larger coils into the metal plate structure. The metal plate's rigid structure and precise cutout portions allow accommodation of larger coil dimensions without requiring increased overall actuator size, thus enabling larger vibration-generating coils within a compact form factor.
3Force
If the gap between coil and magnet is reduced to increase driving force and downsize the actuator, then the actuator size decreases and driving force increases, but accurate positioning of the coil becomes more critical and difficult
Solution Approach 1:
The invention implements preliminary positioning actions by forming precise cutout concave portions and curved protrusions in the metal plate before coil installation. These pre-formed features guide and constrain the coil to its exact position, ensuring accurate alignment with the magnet even when the gap is minimized, thus facilitating both downsizing and high driving force.
Solution Approach 2:
The invention replaces the mechanical positioning system of the resin holder with a precision-formed metal plate structure. The cutout concave portions and curved protrusions create precise mechanical constraints that automatically position the coil accurately, providing superior positioning precision compared to the resin holder system, especially critical when the coil-magnet gap is reduced.
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 design allows for increased coil size, improved acceleration, and enhanced vibration generation while maintaining precise positioning, thereby improving the actuator's performance and efficiency.
Implementation Method 1
a magnetic drive circuit including a coil 10 and a magnet 16 facing the coil 10 in a first direction (Z direction), and vibrating the movable body 5 in a second direction (X direction) intersecting the first direction with respect to the support body 3
Data Source
AI summary
An actuator includes a movable body provided with a magnet, a support body provided with a case and a coil assembly, a connecting body to be connected to the movable body and the support body, and a magnetic drive circuit. The coil assembly includes a first plate. The case includes a first case member, and a second case member. The coil assembly is positioned in a Z direction by fitting a protruding plate portion protruding from an edge of the first plate to an outer peripheral side into a first cutout concave portion provided in an edge of the first case member, and a second cutout concave portion provided in an edge of the second case member, and abutting a curved portion provided on an edge of each of the cutout concave portions against the protruding plate portion from both sides in the Z direction.