Actuator with Radial Protrusion for Stable Operation Object Mounting
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Solution Overview
Problem
Conventional magnetic head moving actuators face challenges in stabilizing operation objects that are relatively large compared to the actuator and securely attaching the drive coil to a host device, leading to instability and difficulty in miniaturization for portable devices.
Innovation Solution
The actuator design includes a drive coil wound around a tube-shaped coil holding body with overlapping drive magnet pieces and a magnet holding body featuring protruded parts and flat surfaces for enhanced stability, allowing for secure attachment of operation objects and the drive coil to host devices, and utilizing a plate spring for relative movement and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the actuator is miniaturized to fit portable devices, then the size of the actuator is reduced, but the operation object becomes relatively large compared to the actuator, making it difficult to hold the operation object in a stable state
Solution Approach 1:
The invention extends the coil holding body in the radial direction beyond the magnet holding body, creating a protruded part that provides an additional dimensional space for mounting the operation object. This radial extension allows the operation object to be positioned in a way that improves stability without increasing the axial length of the actuator, thus resolving the contradiction between miniaturization and operational stability.
Solution Approach 2:
The protruded part of the coil holding body is pre-formed with a flat surface that serves as a mounting platform for the operation object. This preliminary structural preparation ensures that the operation object can be securely attached before the actuator is installed in the portable device, providing stability from the outset and eliminating the need for additional stabilization mechanisms that would increase size.
2Device complexity
If the coil bobbin is accommodated inside the yoke, then the actuator structure is compact, but it becomes difficult to attach the drive coil side to a host device in a stable state
Solution Approach 1:
The invention utilizes the radial dimension by extending the coil holding body beyond the magnet holding body in the radial direction. This creates a protruded part that serves as an external mounting interface for attaching the drive coil side to the host device. The attachment surface is formed in a direction perpendicular to the moving direction, providing stable mechanical coupling without compromising the compact internal structure where the coil bobbin is accommodated inside the yoke.
3Area of moving object
If the operation object is relatively large compared to the actuator, then the actuator can drive larger loads, but the operation object becomes difficult to hold in a stable state
Solution Approach 1:
The protruded part of the coil holding body extends in the radial direction, providing an extended mounting surface for the operation object. This radial extension creates additional leverage and support points that help stabilize larger operation objects, allowing them to be securely attached without increasing the axial footprint of the actuator.
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 enables stable attachment of large operation objects and secure attachment of the drive coil to host devices, reducing the risk of inclination and improving the actuator's stability and usability in miniaturized portable devices.
Implementation Method 1
an actuator including a drive coil which is wound around in a substantially tube shape, a drive magnet part which is disposed on an inner peripheral side with respect to the drive coil... when a relatively moving direction of the coil holding body with respect to the magnet holding body is referred to as a first direction
Data Source
AI summary
An actuator may include a drive coil, a drive magnet part, a coil holding body and a magnet holding body. The coil holding body may include a tube part around which the drive coil is wound, and the drive magnet part may include two drive magnet pieces whose opposed faces are magnetized in the same magnetic pole. The coil holding body may be linearly and relatively movable to the magnet holding body. The magnet holding body may include an opening part formed in one of the two end face parts structuring the magnet holding body. The coil holding body may include a protruded part which is protruded to an outer side through the opening part, the protruded part may formed so as to extend over the tube part, and a flat part in a flat face shape may be formed in the protruded part.