The present invention provides an optical semiconductor device comprising: a wiring circuit board; at least one optical semiconductor element mounted on the wiring circuit board; resin layer A that encapsulates the at least one optical semiconductor element therewith; and resin layer B interposed between the resin layer A and the wiring circuit board, and having a tensile modulus as measured at 30 C. of 0.001 to 0.4 GPa.

 
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> Slider having a textured air bearing surface, head stack assembly and disk drive using same

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