LASER PULSE CONTROL CIRCUIT

摘要

[PROBLEMS] To appropriately execute Epsilon adjustment. [MEANS FOR SOLVING PROBLEMS] When a laser element is driven by a laser pulse having a first and a second light emission level, a laser pulse control circuit sets the first and the second light emission level according to a predetermined ratio of the first light emission level against the second light emission level. The relationship between an operation amount for causing the second light emission level setting unit to adjust the second light emission level based on the first light emission level and a reciprocal of the ratio is a straight line inevitably passing through a certain point when it is at an arbitrary first light emission level and the inclination of the straight line is proportional to a predetermined first light emission level. According to this regularity, the first light emission level according to an optical disc and the operation amount correlated to a reciprocal of the ratio are calculated and the second light emission level setting unit is caused to set the second light emission level in accordance with the operation amount calculated.