Disk Drive Flexure Bent Stub Crosstalk Reduction
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Solution Overview
Problem
Crosstalk occurs in disk drive flexures due to the presence of a stub over the terminals of a circuit board, affecting the electrical characteristics of the disk drive.
Innovation Solution
A disk drive flexure with a bent stub portion is designed, where the stub is bent in the thickness direction to reduce crosstalk, with a bending angle of 30° or more, effectively isolating read conductors from write conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stub is left uncut near the tail pad portion after cutting off the test pad portion, then the flexure tail structure is simplified and manufacturing is easier, but crosstalk occurs between write conductors and read conductors affecting electrical characteristics
Solution Approach 1:
The harmful stub portion containing the conductors is completely removed by cutting the flexure tail at a position that extends beyond the stub. This extraction eliminates the source of crosstalk while preserving the functional tail pad portion with tail electrodes that remains connected to the circuit board.
Solution Approach 2:
The flexure tail is divided into distinct functional segments: the tail pad portion with tail electrodes for electrical connection to the circuit board, and the stub portion containing conductors that is completely removed. This segmentation allows the harmful stub to be separated and eliminated while retaining the functional tail pad.
2Area of stationary object
If the stub is disposed over terminals of a circuit board, then the flexure tail can be compactly arranged, but electrical interference occurs between conductors affecting disk drive electrical characteristics
Solution Approach 1:
The stub portion that causes electrical interference is completely extracted and removed from the flexure tail. The cutting line is positioned to extend beyond the stub, ensuring complete removal of the harmful conductors while maintaining the functional tail pad portion for electrical connection.
Solution Approach 2:
The stub portion, which initially appears as waste material to be minimized, is actually utilized as a design element that can be completely removed to eliminate crosstalk. By positioning the cutting line to extend beyond the stub, the removal of what was considered unnecessary material actually solves the electrical interference problem.
Data Source
AI summary
A flexure tail is provided in a flexure including a metal base and a conductive circuit portion. The flexure tail includes a tail pad portion. In the tail pad portion, tail electrodes to are arranged. At the tail pad portion, a stub which remains after a test pad portion is cut off is formed. The stub includes conductors to which are left uncut. The conductors to which are left uncut are electrically connected to the tail electrodes to, respectively. The stub includes a bent portion. The bent portion is formed by bending a frame portion of the tail pad portion, and forms an angle of 30° or more with respect to a circuit board. The tail electrodes to are joined to terminals to of the circuit board.