Disk Base Recess Design for Shock-Resistant Head Actuator Movement
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Solution Overview
Problem
Magnetic disk devices are prone to data loss due to deformation caused by severe shocks, where the disk's data recording region can contact and be damaged by the base's step portions during movement, leading to information loss.
Innovation Solution
The design incorporates a recess in the base with strategically positioned step portions that prevent the data recording region from contacting the base during disk deformation, ensuring the data recording area remains safe from damage by positioning the first step portion on the opposite side of the head actuator with respect to the disk's center, thus avoiding contact with the base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the step portion is positioned on the actuator side to define the recess, then the head actuator has sufficient movement space, but the data recording region may contact and be damaged by the step portion during disk deformation
Solution Approach 1:
The patent inverts the conventional positioning by placing the step portion on the actuator side rather than the disk side. This inversion creates a recess that protects the data recording region from contacting the step portion during disk deformation, while still allowing sufficient movement space for the head actuator through proper recess design
2Ease of operation
If the recess is formed to accommodate the head actuator movement, then the actuator has adequate space, but the disk may deform and contact the step portion causing data loss
Solution Approach 1:
The patent applies preliminary action by pre-forming the recess with specific geometric constraints before any shock occurs. The recess is designed with a first side facing the actuator and a second side facing the disk, creating a protective zone in advance that prevents data recording region contact with the step portion during future disk deformation events
Data Source
AI summary
According to one embodiment, a disk device includes a base having a bottom wall, a motor provided on the base, a disk rotatably supported on the motor, a head, and a head actuator which supports the head for movement with respect to the recording medium. The bottom wall of the base includes a recess opposing a movement region for the head actuator and a first step portion and a second step portion which individually extend from the vicinities of the motor to the vicinities of an outer peripheral edge of the recording medium and define the recess. At least a part of the first step portion is located on the opposite side of the head actuator with respect to a line which connects an outer end portion of the first step portion and a center of rotation of the recording medium.