Patent ID: 6762986
Filing Date: 2004-07-13
Classification: G11B

Abstract:
A recording apparatus which is adaptive to various optical recording media in response to an NRZI signal, the recording apparatus comprising:a microcomputer which stores timing data for each optical recording medium, wherein a first base point for the timing data which represent starting and ending positions of a first pulse and a starting position of a multi-train pulse precedes a rising edge of a mark by 1T and a second base point for the timing data which represent a starting and ending position of the last pulse and an ending position of a cooling pulse precedes a falling edge of the mark by 3T, where T is a cycle of a reference clock; a base signal generator which generates a first base signal indicating the first base point and a second base signal indicating the second base point, in synchronism with the NRZI signal, wherein the base signal generator comprises; a first shift register which shifts the first base signal to generate a plurality of first setting signals which are equally spaced apart by a fraction of the cycle of the reference clock; first, second and third multiplexers which multiplex the first setting signals from the first shift register and the timing data from the microcomputer to generate a first pulse start signal, a first pulse end signal and a multi-pulse train start signal, wherein the starting and ending positions of the first pulse and the starting position of the multi-train pulse are set to coincide with one of the plurality of first setting signals; a second shift register which shifts the second base signal to generate a plurality of second setting signals which are equally spaced apart by the fraction of the cycle of the reference clock; fourth, fifth and sixth multiplexers which multiplex the second setting signals from the second shift register and the timing data from the microcomputer to generate a last pulse start signal, a last pulse end signal and a cooling pulse end signal, wherein the starting and ending positions of the last pulse and the ending position of the cooling pulse are set to coincide with one of the plurality of second setting signals; and a first gate which performs an AND-operation on the NRZI signal and a clock signal to generate a fixed-width multi-pulse signal; a write waveform generation unit which generates the write pulse control signals in response to the base signals from the base signal generation unit and the fixed-width multi-pulse signal; a laser diode; and a laser diode driver which drives the laser diode in response to the write pulse control signals.