Voice Coil Actuator Alignment via Protrusion-Recess Fit
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Solution Overview
Problem
Conventional voice coil actuators face issues with positioning accuracy, leading to potential damage due to contact between the magnetic circuit and coil units, which affects the magnetic flux density and vibrating force.
Innovation Solution
An electronic apparatus with a voice coil actuator featuring a magnetic circuit unit and a coil unit aligned using a fit unit with a protrusion-recess structure, ensuring accurate positioning and maintaining a uniform magnetic gap, thereby improving magnetic flux density and preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the magnet is disposed on the outer side from the coil to increase the cross-sectional area and magnetic flux density, then the vibrating force increases, but the positioning accuracy between the magnetic circuit unit and coil unit deteriorates, leading to potential contact and damage
Solution Approach 1:
A positioning protrusion is provided on the magnetic circuit unit and a positioning recess is provided on the coil unit (or vice versa). These positioning structures act as intermediaries that guide and constrain the relative positioning between the magnetic circuit unit and coil unit, ensuring accurate alignment during assembly and preventing contact damage while maintaining the outer magnet configuration for high vibrating force
2Force
If the gap between the yoke and pole is narrowed to increase magnetic flux density, then the vibrating force increases, but the risk of contact between the magnetic circuit unit and coil unit increases due to positioning errors
Solution Approach 1:
The positioning protrusion and positioning recess are designed to establish correct alignment between the magnetic circuit unit and coil unit before the coil unit is pushed toward the magnetic circuit unit during assembly. This preliminary positioning action ensures that even when the gap is narrowed for high magnetic flux density, the components remain properly aligned and cannot come into contact, thereby preventing damage
3Reliability
If high positioning accuracy is required to prevent contact damage, then the manufacturing complexity increases, but the vibrating force decreases if the magnet size is reduced
Solution Approach 1:
Instead of requiring high precision throughout the entire magnetic circuit unit and coil unit, the positioning protrusion and positioning recess provide localized precision only where needed for alignment. This allows the majority of the structure to be manufactured with standard tolerances, reducing overall manufacturing complexity while still preventing contact damage and maintaining the outer magnet configuration for high vibrating 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 solution enables precise positioning of the coil unit with respect to the magnetic circuit unit, achieving the required magnetic flux density and preventing damage, resulting in a more effective vibrating force.
Implementation Method 1
The voice coil actuator includes a magnetic circuit unit on a fixed side and a coil unit on a movable side, and vibrates the coil unit with respect to the magnetic circuit unit by generating a magnetic field between the magnetic circuit unit and the coil unit
Implementation Method 2
a fit unit to align a center position of the magnetic circuit unit and a center position of the coil unit with each other by fitting the magnetic circuit unit and the coil unit to each other when the coil unit is pushed toward the magnetic circuit unit
Data Source
AI summary
A touch panel including an operation surface on which touch operation is to be performed; a voice coil actuator to apply vibrating force to the operation surface in response to the touch operation; and a main body chassis supporting the touch panel via a spring are included, and the voice coil actuator includes: a magnetic circuit unit provided on the main body chassis and including a magnetic gap; a coil unit provided on a rear surface of the touch panel and including a coil provided in the magnetic gap; and a fit unit to align a center position of the coil unit and a center position of the magnetic circuit unit and with each other by fitting the coil unit and the magnetic circuit unit and to each other when the coil unit is pushed toward the magnetic circuit unit.