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AssigneeSumitomo Electric Industries, Ltd.
InventorsTakahisa Iguchi, Tsutomu Nakamura, Tetsuo Nakai
Estimating the term…
A polycrystalline diamond is prepared by chemical vapor deposition (step 101). A surface of the polycrystalline diamond is metallized (step 102). The metallized surface of the polycrystalline diamond is grooved with a YAG laser (step 103). A wedge or the like is driven into the grooves of the polycrystalline diamond to pressurize the same, whereby the polycrystalline diamond is divided along the grooves (step 104). Alternatively, a surface of a polycrystalline diamond prepared by chemical vapor deposition is grooved with a YAG laser (step 112), and the surface of the polycrystalline diamond is metallized (step 113) after the grooving. The obtained diamond heat sink (10) includes a first layer (11a) grooved with a laser, and a mechanically divided second layer (11b). Graphite adheres to the outer peripheral surface of the first layer (11a). The outer peripheral surface of the second layer (11b) has a greater surface roughness than that of the first layer (11a).
A diamond heat sink comprising a polycrystalline diamond substrate synthesized by chemical vapor deposition and having a pair of opposite main surfaces that are electrically insulated from each other, wherein said polycrystalline diamond substrate comprises a first layer and a second layer provided between said pair of main surfaces, wherein said first layer has a first outer peripheral surface having a first surface roughness and having graphite adhering thereto, and wherein said second layer has a second outer peripheral surface having a second surface roughness greater than said first surface roughness.
A diamond heat sink comprising a polycrystalline diamond substrate including a first layer and a second layer and having first and second opposite main surfaces that are electrically insulated from each other, a first metallization layer arranged on said first main surface and a second metallization layer arranged on said second main surface, wherein said first and second metallization layers are electrically insulated from each other, said first layer has are electrically insulated from each other, said first layer has a first outer peripheral surface having a first surface roughness and having graphite adhering thereto, and said second layer has a second outer peripheral surface having a second surface roughness greater than said first surface roughness.
Dependencies are inferred from the claim text.