Patent ID: 7053394
Filing Date: 2006-05-30
Classification: G01B,G01D,G03F,G11B,H01J

Abstract:
1. A recording device of a master disk for an information recording medium, comprising: a rotating mechanism for holding and rotating a substrate disk with a recording material layer; a displacement detecting device for detecting a displacement of a surface of the substrate disk, based on a change in a light path of a light beam reflected by the surface of the substrate disk caused by the displacement of the surface of the substrate disk; and an irradiation device for irradiating the substrate disk with an electron beam according to information to be recorded, the recording device performing a control so that the recording beam is focused on the surface of the substrate disk based on a displacement amount detected by the displacement detecting device, wherein the displacement detecting device comprises: plural light sources for emitting the light beams to the surface of the substrate disk; position detectors for respectively detecting positions at which the light beams reflected by the surface of the substrate disk are incident upon predetermined detection planes and outputting them as position detection signals; and a signal processing part for receiving the position detection signals, wherein the recording device further comprises a secondary electron detector for detecting a secondary electron when the substrate disk is irradiated with the recording beam, wherein in a state where the substrate disk on the surface of which a pattern for adjusting a focus of the recording beam is formed is loaded, the secondary electron image obtained when an area including the pattern is scanned by the recording beam is detected by the secondary electron detector, thereby enabling a focus adjustment of the recording beam, and wherein the focus adjustment of the recording beam is performed using the pattern formed on the substrate disk, and a position of light beam irradiation by the displacement detecting device is made in agreement with a position of the pattern, whereby the position of light beam irradiation can be adjusted to be in agreement with a position of recording beam irradiation.