Head Slider Light Absorbing Member Projection Control
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Solution Overview
Problem
In thermally assisted magnetic recording, it is challenging to selectively project and control the distance of both the write and read element portions of a magnetic head, as the heat generation is synchronized with writing and lacks optional control over projecting timing and distance.
Innovation Solution
The use of light absorbing members with different wavelengths near the write and read elements, along with a light source and controller, allows for individual control of the projecting distance and timing by converting laser light into heat, enabling independent projection and adjustment of both elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser light is used to generate heat in the near-field optical element for thermally assisted magnetic recording, then the magnetic head can be projected to reduce magnetic spacing, but the projecting distance and timing cannot be optionally controlled
Solution Approach 1:
The patent divides the heating function into separate components: a dedicated heating coil for the write element and the laser-induced heating for the read element. This segmentation allows independent control of each element's projection, resolving the contradiction between achieving precise magnetic spacing and maintaining optional controllability of projecting parameters.
Solution Approach 2:
The patent introduces dynamic control capabilities by enabling independent activation and adjustment of the heating coil for the write element while the read element uses laser-induced heating. This dynamic control system allows optional adjustment of projecting distance and timing for each element separately, overcoming the limitation of fixed projection parameters.
2Manufacturing precision
If heat generation is synchronized with writing in thermally assisted magnetic recording, then the write element can be projected, but the read element cannot be projected independently
Solution Approach 1:
The patent segments the heating mechanisms by assigning a dedicated heating coil to the write element for synchronized heat generation during writing, while the read element uses a separate laser-induced heating mechanism. This segmentation enables independent projection control of the read element without affecting the write element's projection, thereby achieving both precise write element projection and independent read element projection capability.
Solution Approach 2:
The patent introduces a light absorbing member as an intermediary component that converts laser light into heat specifically for the read element. This intermediary enables the read element to be projected independently through optical energy conversion, while the write element continues to use direct thermal heating from the coil, achieving independent projection control for both elements.
3Temperature
If a wide area of the head portion is projected using TFC, then heat can be distributed, but it is difficult to selectively project the desired element region
Solution Approach 1:
The patent applies local quality by concentrating heating energy at specific locations: the heating coil is positioned to target the write element region, while the light absorbing member is positioned to target the read element region. This localized heating approach enables selective projection of specific element regions while maintaining effective heat distribution within each targeted area, resolving the contradiction between heat distribution and selective projection precision.
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 solution allows for the simultaneous projection and controlled distance adjustment of both write and read elements, enhancing the precision and flexibility of thermally assisted magnetic recording.
Implementation Method 1
a light absorbing member provided near a read element compared with a middle between a write element and the read element
Implementation Method 2
a thermal expansion layer including a material having a high linear expansion coefficient is provided between a magnetic pole and a near-field light generating portion, and heat generated during introducing laser light into the near-field generating portion is used to locally project a magnetic head portion
Data Source
AI summary
Embodiments of the present invention provide a technique for projecting both a write element portion in writing and a read element portion in reading, and controlling a projecting distance of each write element and read element. According to one embodiment, a light absorbing member and a thermally expanding member are formed near a read element, and light is irradiated to the light absorbing member, thereby a read element is projected. Alternatively, light absorbing members, which absorb light having different wavelengths from each other, and thermally expanding members are formed near a write element and near the read element respectively, and a wavelength or intensity of light to be irradiated is changed, thereby a projecting distance of each of the write element and the read element is individually optionally controlled.