Patent ID: 6930961
Filing Date: 2005-08-16
Classification: G11B

Abstract:
1. A grooving apparatus for forming a groove to function as an information track in an information recording medium comprising: an emitting device which emits an electron beam; a focusing device which focuses the emitted electron beam on a fixed range smaller than the size of the groove on the information recording medium; and a controlling device which controls the electron beam so that the electron beam is focused in position on the information recording medium to form the groove in the information recording medium, wherein the focusing device uses one emitted electron beam to form one beam spot of a fixed size on the information recording medium in a smaller range than the size of the groove, and the controlling device includes a moving device which moves the beam spot at a fixed velocity of movement of the beam spot relative to the information recording medium in accordance with two shape signals indicative of the respective shapes of two walls of the groove so as to scan the beam spot on the information recording medium in an area to be formed into the groove.