Disk Actuator Offset Wiring for Interference Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In split actuator hard disk drives, the reduced area of wiring boards makes it difficult to accurately position connection pads for flexure connection end portions, leading to potential interference and reliability issues.
Innovation Solution
The wiring members of the actuator assemblies have connection end portions that are offset from the border plane with respect to the central line of the arms, allowing for appropriate joining to the wiring boards and preventing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the head actuator is split into multiple independently rotatable actuators, then the storage capacity is increased, but the wiring boards may interfere with each other in the boundary portion
Solution Approach 1:
The connection end portions of the flexures are positioned in the thickness direction of the arm (z-direction) rather than only in the planar direction. By making the connection end portions extend in the thickness direction and position them offset from the border plane, the patent utilizes the third dimension to avoid interference between wiring boards of stacked actuators while maintaining electrical connectivity.
2Reliability
If the area of the wiring board is reduced to prevent interference, then the interference is prevented, but it becomes difficult to locate the connection pads at appropriate positions
Solution Approach 1:
Instead of reducing the wiring board area in the planar direction, the patent positions connection end portions offset from the border plane in the thickness direction. This allows connection pads to be located at appropriate positions on the wiring board without causing interference, as the offset positioning in the z-direction provides sufficient clearance between stacked actuators.
Solution Approach 2:
The offset positioning of connection end portions from the border plane acts as an intermediary spatial buffer. This intermediate position in the thickness direction separates the wiring boards of adjacent actuators, preventing direct interference while maintaining proper connection pad locations for reliable electrical connection.
3Ease of operation
If a gap is provided in the boundary between two actuator blocks, then smooth operation is secured, but the positioning accuracy of wiring boards decreases
Solution Approach 1:
The patent addresses positioning precision by utilizing the thickness direction for offset positioning of connection end portions. Even with a gap between actuator blocks, the offset in the z-direction ensures that connection pads can be accurately positioned without interference, as the vertical separation compensates for any positioning variations in the gap region.
Data Source
AI summary
According to one embodiment, a disk device comprises a plurality of rotatable magnetic disks, a first actuator assembly, and a second actuator assembly. A slit provided in each of arms of the first actuator assembly is provided to be offset in a direction spaced away from a border plane between actuator assemblies with respect to a center of the arm in its thickness direction. A connection end portion of a wiring member is partially located in the slit, such as to be offset in a direction spaced away from the border plane, and disposed on a wiring board, and joined to the wiring board.