Patent ID: 7717769

Claim:
A method for producing an object lapped on a surface thereof which comprises the steps of: manufacturing a lapping board having abrasive grains fixed thereon by the steps of: providing an assembly comprising a rotatable metal board having thereon a surface of soft metal, an abrasive slurry-supplying means arranged over the surface of the metal board, an abrasive-pressing means detachably placed on the surface of the metal board, the abrasive-pressing means having a surface harder than the surface of soft metal, and a ultrasonic oscillation-generating means attached to either or both of the abrasive-pressing means and the metal board; rotating the metal board of the assembly while supplying an abrasive slurry comprising abrasive grains suspended in a liquid medium onto the surface of the metal board from the abrasive slurry-supplying means and while supplying electric power to the ultrasonic oscillation-generating means to generate and apply ultrasonic oscillation to either or both of the abrasive-pressing means and the metal board, whereby introducing the supplied abrasive slurry between the surface of the metal board and the surface of the abrasive-pressing means and fixing some of the abrasive grains onto the surface of the metal board under the condition that a portion of the abrasive grain is embedded into the surface of the metal board and a remaining portion of the abrasive grain is exposed over the surface of the metal board; removing unfixed abrasive grains from the surface of the metal board; placing a holding means having on a bottom thereof an object to be lapped on the lapping board; and rotating the lapping board, thereby lapping the object on a bottom thereof.