Heat Flow Path Structure for Laser Diode Thermal Management
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Solution Overview
Problem
The challenge in heat-assisted magnetic recording is effectively radiating heat from a laser diode light source, as the thermal conductivity of common substrates is insufficient, leading to unstable light-emitting operations and potential damage to the laser diode due to inadequate heat dissipation.
Innovation Solution
A heat flow path structure is implemented in the head gimbal assembly, where heat from the laser diode is routed through a series of pads and connection members, including solder and insulating layers, to efficiently radiate heat away from the light source, bypassing the substrate and slider substrates, thereby ensuring effective heat dissipation without relying solely on thermal conductivity of these materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat is radiated through the substrate using conventional thermal conduction, then the structure is simple, but the thermal conductivity is insufficient leading to unstable light-emitting operation
Solution Approach 1:
The heat radiation path is segmented into multiple independent components: solder layers, insulating layers, and connection members, each optimized for specific thermal management functions rather than relying on a single substrate for heat dissipation
Solution Approach 2:
Insulating layers are introduced as intermediary components between the substrate and slider substrate, creating a controlled thermal pathway that prevents harmful thermal interference while maintaining structural integrity
2Temperature
If the light source is positioned close to the substrate for efficient heat radiation, then heat dissipation is improved, but the light source suffers direct mechanical shock during operation
Solution Approach 1:
The suspension acts as an intermediary component that provides mechanical isolation and shock absorption for the light source, while still allowing effective heat transfer through the structured thermal pathways to the slider substrate
Solution Approach 2:
The thermal and mechanical pathways are asymmetrically designed: the light source is positioned away from the substrate to avoid mechanical shock, while structured thermal pathways (solder layers, insulating layers, connection members) ensure efficient heat dissipation through the suspension system
3Device complexity
If all light source and head elements are provided within the slider, then the head structure is compact, but the manufacturing yield decreases due to multiplication of process yields
Solution Approach 1:
The head assembly is segmented into separate functional modules: the slider containing head elements and the light source unit with suspension, allowing independent manufacturing and evaluation of each module before final assembly, thereby maintaining high manufacturing yield
Solution Approach 2:
The suspension structure serves multiple functions: mechanical support for the light source, shock isolation, and thermal conduction pathway, eliminating the need for separate components and reducing overall assembly complexity despite modular design
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 stabilizes the light-emitting operation of the laser diode, reduces thermal impedance, and prevents damage by effectively dissipating heat generated during operation, enhancing the thermal management of the magnetic recording head.
Implementation Method 1
an end surface opposite to the source-installation surface of the light source being connected to the first pad by a first connection member
Implementation Method 2
a first pad being provided on an upper surface of the suspension... effectively radiate the heat
Implementation Method 3
the at least one electrode of the head part being connected to the second pad by a second connection member
Data Source
AI summary
Provided is an HGA with a radiation structure that can effectively get away the heat generated from a light source. The HGA comprises a suspension and a head comprising a slider and a light source unit. The suspension comprises an opening, and the light source unit projects through the opening to the opposite side to the slider in relation to the suspension. Further, the first and second pads are provided on the upper and lower surfaces of the suspension, respectively, the end surface opposite to the source-installation surface of the light source is connected to the first pad by the first connection member, and an electrode of the head part is connected to the second pad by the second connection member. Thus, heat flow paths can be provided from the light source to the opposed-to-medium surface to allow effective radiation of the heat generated from the light source.