Bent Flexure Wiring Board for Dual Actuator Spacing
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Solution Overview
Problem
The existing disk apparatus with dual actuator assemblies faces challenges in ensuring sufficient spacing between actuator assemblies for smooth operation without reducing memory capacity, as the standard 0.15 mm gap is insufficient for independent rotation, and reducing the number of magnetic heads or extending the stacking gap decreases storage capacity.
Innovation Solution
The disk apparatus incorporates a design where the connection end portions of the flexures are bent with respect to the installation surface, allowing for a narrower gap between actuator blocks without interference, maintaining the number of magnetic heads and disks, by using a flexible printed circuit board with connection terminals that are either both or only one of which are bent, securing sufficient spacing between actuator assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gap between actuator assemblies is set to approximately 0.15 mm to maintain compact structure, then the device complexity is reduced, but the actuator assemblies cannot operate smoothly without interference
Solution Approach 1:
The connection end portions of the flexures are bent in a direction transverse to the stacking direction (radially outward direction), utilizing a different spatial dimension to resolve the interference problem. This allows the actuator assemblies to be positioned closer together in the stacking direction while maintaining sufficient clearance in the radial direction, thus solving the contradiction between compact structure and smooth operation.
2Reliability
If the number of magnetic heads or magnetic disks is reduced in the boundary portion to ensure sufficient spacing, then the interference between actuator assemblies is minimized, but the memory capacity of the disk apparatus decreases
Solution Approach 1:
Instead of reducing the number of magnetic heads or disks in the boundary portion, the invention utilizes the radial dimension by bending the connection end portions of the flexures outward. This allows the actuator assemblies to be positioned closer together in the stacking direction while maintaining sufficient clearance in the radial direction, thereby preserving the number of magnetic heads and disks and maintaining memory capacity.
3Reliability
If the stacking gap between magnetic disks is extended to ensure sufficient spacing between actuator assemblies, then the interference is reduced, but the memory capacity of the disk apparatus decreases
Solution Approach 1:
The invention resolves the contradiction by bending the connection end portions of the flexures in the radial direction rather than increasing the stacking gap between magnetic disks. This dimensional change allows the actuator assemblies to be positioned closer together in the stacking direction while maintaining sufficient clearance in the radial direction, thereby preserving the stacking gap for optimal memory capacity.
Data Source
AI summary
A disk apparatus includes recording disks and a first and a second actuator assembly that rotate about a support shaft and that each include: an actuator block; a wiring board having connection terminals and installed on an installation surface of the actuator block; and head assemblies each attached to the actuator block via an arm and each including a head and an interconnection member. The wiring board of each of the first and the second actuator assembly has a connection portion connected to one of the connection terminals and located adjacently to a boundary between the first and the second actuator assembly, and the connection portion of the first or the second actuator assembly is bent with respect to the installation surface.