Magnetic Head Shared Current Terminals for Bonding Space Reduction
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Solution Overview
Problem
The complexity and size of head stack assemblies in magnetic disk devices increase with the number of elements in magnetic heads, leading to complicated structures and increased space requirements for wiring line bonding.
Innovation Solution
A magnetic disk device with a current control unit that switches current polarity between magnetic heads, allowing shared current terminals to connect laser diodes, reading elements, and heater elements, reducing the space needed for wiring line bonding by overlapping terminal connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of elements in magnetic head increases, then the recording/reproduction capability is improved, but the space of bonding portions of wiring lines increases and structure becomes complicated
Solution Approach 1:
The patent combines current terminals for laser diodes, reading elements, and heater elements into shared terminals. Specifically, the current terminal for the laser diode is also used as the current terminal for the reading element and heater element, merging multiple functions into single terminal structures to reduce bonding space and simplify the head assembly structure.
Solution Approach 2:
The patent implements multi-functional current terminals that serve multiple purposes. The same current terminal structure is used for different elements (laser diode, reading element, heater element) depending on the operational mode, making the terminal system universal and reducing the total number of terminals required.
2Adaptability or versatility
If the number of elements in magnetic head increases, then the recording/reproduction capability is improved, but the size of head stack assembly increases
Solution Approach 1:
The patent merges current terminal functions across multiple elements, reducing the total number of terminals and their associated bonding structures. This consolidation directly reduces the space occupied in the head stack assembly while maintaining full functionality for laser writing, reading, and thermal assistance operations.
Solution Approach 2:
By designing current terminals that can serve multiple elements (laser diode, reading element, heater element) through polarity switching, the patent reduces the overall terminal count and associated wiring space, thereby reducing the head stack assembly size while preserving enhanced recording/reproduction capabilities.
3Ease of operation
If separate current terminals are provided for laser diode, reading element, and heater element, then the control flexibility is improved, but the space for wiring line bonding increases
Solution Approach 1:
The patent combines current terminals for laser diodes, reading elements, and heater elements into shared terminals. Specifically, the current terminal for the laser diode is also used as the current terminal for the reading element and heater element, merging multiple functions into single terminal structures to reduce bonding space and simplify the head assembly structure.
Solution Approach 2:
The patent employs polarity switching to dynamically assign different functions to the same current terminal. By reversing the current polarity, the system can switch between different operational modes (laser writing, reading, thermal assistance) using the same physical terminal, maintaining control flexibility while reducing terminal count.
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 configuration reduces the space required for wiring line bonding and the size of the IC chip, while enabling efficient thermally-assisted magnetic recording on multiple disk surfaces.
Implementation Method 1
a laser diode 21
Implementation Method 2
a reading element 24
Implementation Method 3
a writing element 25
Implementation Method 4
a heater element 26
Data Source
AI summary
According to one embodiment, a first magnetic head is used to record or reproduce data on or from the first disk surface and includes a first two-terminal element including a first positive terminal and a first negative terminal. A second magnetic head is used to record or reproduce data on or from the second disk surface and includes a second two-terminal element including a second positive terminal and a second negative terminal. A current control unit includes a first current terminal which is commonly connected to the first positive terminal and the second negative terminal and a second current terminal that is commonly connected to the first negative terminal and the second positive terminal and can switch a current polarity between the first current terminal and the second current terminal.