Optical output regulating apparatus and method

Application Number: 00108693
Application Date: 2000.05.19
Publication Number: 1274917
Publication Date: 2000.11.29
Priority Information: 1999/5/19 JP 139169/99
International: G11B11/10;G11B7/125
Applicant(s) Name: Sony Corp.
Inventor(s) Name: Tsutsui Keiichi;Takeshita Yasuyuki
Patent Agency Code: 31100
Patent Agent: xu tai
Abstract A reproducing laser output can be adjusted to an optimal level. To this end, a magneto-optical disk device (1) comprises a differential amplifier (23) and a shortest recording mark identifier (3) which detect a shortest recording mark reproducing signal corresponding to a component of a shortest recording mark in a reproducing signal obtained by reproducing a magneto-optical disk (100), an envelope detector (33) which detects an amplitude level of the shortest recording mark reproducing signal, a comparator (35) which compares the amplitude level with a reference voltage outputted from the reference voltage source (34), and a drive control section (30) which adjusts the reproducing laser beam to an output level at which the amplitude level is equal to or higher than the reference voltage, based on a comparison result from the comparator (35).