Thermally Assisted Magnetic Head Pad Layout for Stable Bonding
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Solution Overview
Problem
The existing thermally assisted magnetic heads face issues with unstable bonding at the joints where the N-electrode of the laser diode is connected to the LDG pad and the corresponding electrically connecting terminal of the suspension, leading to low yield and failure in electrical connections.
Innovation Solution
A thermally assisted magnetic head design with a slider and light source unit featuring a first and second light source connection pad arranged in a row, with an intermediate connection pad not on the same line, ensuring reliable electrical connections through electrodes and intermediate pads, avoiding overlap and maintaining the original number of connection pads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the N-electrode of the laser diode is connected to the LDG pad on the slider, then electrical connection is established, but the joint where the N-electrode is bonded to the LDG pad and the joint where the corresponding electrically connecting terminal of the suspension is bonded to the LDG pad may overlap, resulting in unstable bonding and low yield
Solution Approach 1:
The patent introduces an intermediate connection pad arranged in a triangular relationship with the first and second light source connection pads, transforming the linear arrangement into a two-dimensional configuration. This dimensional change allows the intermediate connection pad to serve as a dedicated bonding target for the suspension's electrically connecting terminal, preventing overlap with the laser diode electrode bonding area and simultaneously achieving stable bonding and high yield
Solution Approach 2:
The intermediate connection pad acts as an intermediary element between the second light source connection pad and the suspension's electrically connecting terminal. By introducing this intermediate bonding pad, the patent separates the bonding functions: the laser diode's second electrode bonds to the second light source connection pad, while the suspension's terminal bonds to the intermediate connection pad, thereby avoiding overlap and ensuring both bonding stability and manufacturing yield
2Reliability
If the number of connection pads arranged in the row on the slider is reduced to leave more space for the LDG pad, then overlap between bonding joints is avoided, but the method cannot meet multiple performance requirements for the magnetic head as the connection pads provide various functions
Solution Approach 1:
The patent segments the connection pad functions by introducing an intermediate connection pad that is exclusively electrically connected with the second electrode and the second light source connection pad. This segmentation allows different connection pads to have specialized functions: the first light source connection pad for P-electrode connection, the second light source connection pad for N-electrode connection, and the intermediate connection pad for suspension terminal connection, thereby maintaining multiple performance requirements while avoiding bonding overlap
Solution Approach 2:
By arranging the intermediate connection pad in a triangular configuration rather than in a linear row with other connection pads, the patent utilizes two-dimensional space on the slider. This dimensional arrangement preserves all necessary connection pads for multiple functions (readers, writers, HDI sensors, laser diode control) while providing a dedicated bonding area for the suspension terminal, thus maintaining both versatility and bonding stability
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 design ensures reliable electrical connections without reducing the number of connection pads, preventing low yield and overlap issues, thus enhancing the stability and efficiency of the magnetic head.
Implementation Method 1
The light source provides energy to a part of the magnetic recording medium so as to reduce the coercive force thereof
Data Source
AI summary
The disclosure provides a thermally assisted magnetic head comprising a slider and a light source unit provided on the slider. An intermediate connection pad is provided in such a manner that the first light source connection pad and the second light source connection pad of the slider are arranged in a row on a straight line while the intermediate connection pad is not located on the said straight line. The first electrode of the light source unit is electrically connected with the first light source connection pad, and both the second electrode of the light source unit and the second light source connection pad are electrically connected with the intermediate connection pad. Accordingly, a head gimbal assembly and a hard disk drive are further provided in the embodiment of the disclosure.