Patent ID: 7100595

Claim:
A diamond blade formed by providing slots on the outer peripheral edge of a circular core and fixing a superabrasive layer to a portion of the outer peripheral surface of said core located between said slots, wherein said superabrasive layer includes a plurality of first superabrasive layers having an extension formed by partially extending said superabrasive layer toward the inner periphery of the core and a second superabrasive layer located between respective ones of said first superabrasive layers, a reinforcing superabrasive layer extending from the outer periphery toward the inner periphery of said core is formed on the inner peripheral side of said second superabrasive layer while said reinforcing superabrasive layer is located closer to the outer periphery than a radial central portion of the core and an outer peripheral end of said reinforcing superabrasive layer is located closer to the outer periphery than an inner peripheral end of the extension of said first superabrasive layer.