Patent ID: 7109462
Filing Date: 2006-09-19
Classification: G11B

Abstract:
1. A light beam output control apparatus comprising: an emission device which emits a light beam; a detection device which detects at least part of the light beam emitted from the emission device; an acquisition device which acquires, as a sampling value, the light intensity level of the detected light beam emitted with a predetermined timing; a first storage device which prestores a value made into a target at a average value at the intensity level of the detected light beam as a target average value; a second storage device which stores a sampling value made into a target at the intensity level of the light beam acquired as the sampling value, as a target sampling value; a first error calculation device which calculates average error between the average value at the intensity level of the detected light beam and the target average value based on the light intensity level of the detected light beam and the stored target average value; a second error calculation device which calculates sampling error between the stored target sampling value and the acquired sampling value; and a control device which controls the output intensity level of the light beam emitted from said emission device, based on the calculated average error and the calculated sampling error.