Actuator Arm Damper for Vibration Control in Hard Disk Drives
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the storage capacity of hard disk drives (HDDs) increases, the number of magnetic disks grows, leading to vibration interference between split actuator assemblies, which can result in increased vibrational response and potential contact between arms and magnetic disks, compromising reliability.
Innovation Solution
The implementation of dampers with varying thicknesses or plane areas on specific arms of the actuator assemblies, specifically designed to have different vibration characteristics, reduces vibration near the support shaft and prevents contact with magnetic disks by enhancing damping effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of magnetic disks is increased to enhance storage capacity, then storage capacity is improved, but vibration interference between actuator assemblies increases
Solution Approach 1:
The patent converts the harmful vibration interference caused by multiple magnetic disks into a beneficial damping effect by strategically placing dampers on actuator arms. The dampers transform the vibrational energy into heat through internal friction, thereby reducing vibration interference while maintaining the high storage capacity achieved through multiple disks.
Solution Approach 2:
The damper acts as an intermediary element between the actuator arm and the magnetic disk. It absorbs and dissipates vibration energy that would otherwise be transmitted from the actuator to the disk, preventing harmful vibrations while allowing the system to maintain its high-density configuration.
2Object-affected harmful factors
If dampers are added to actuator arms to reduce vibration, then vibration is reduced, but device complexity increases
Solution Approach 1:
Instead of adding dampers to all actuator arms uniformly, the patent applies dampers selectively to specific arms based on their vibration characteristics. This local quality approach reduces vibration where needed while minimizing the overall increase in device complexity by avoiding unnecessary dampers on arms that already have acceptable vibration levels.
Solution Approach 2:
The patent varies the parameters of dampers (such as damping coefficient, mass, or geometry) across different actuator arms to match their specific vibration characteristics. This parameter differentiation allows for effective vibration reduction with minimal additional complexity, as each damper is optimized for its specific location rather than using a uniform design throughout.
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 effectively reduces vibrations and prevents contact between the arms and magnetic disks, thereby improving the reliability of the disk drive by attenuating vibrations and maintaining optimal operation.
Implementation Method 1
a first damper is attached to a first arm... a second damper is attached to a second arm... the first damper and the second damper have different vibration characteristics
Implementation Method 2
the first damper and the second damper have different vibration characteristics
Data Source
AI summary
According to one embodiment, a disk device includes a plurality of recording media each including a recording layer and an actuator assembly including an actuator block rotatably supported around a rotation shaft, a plurality of arms extending from the actuator block, and suspension assemblies respectively attached to the arms and supporting respective magnetic heads. Of the plurality of arms, at least one arm has vibration characteristics different from those of the other arms.