Optical information recording device

Abstract

The invention provides a method effective in detecting a reproduction signal in real time correction in which correction is simultaneously performed with recording. In this method, a laser beam emitted from a laser diode 110 is divided into a plurality of beam spots by a diffraction grating 114. One of the plurality of beam spots is used as a beam spot for recording, and another beam spot is used as a beam spot for reproduction. Reflected light components obtained from these beam spots are independently detected by a detector 122. A period for which a recording laser beam is in an ON state is referred to as a gate signal, and a mask is put on an RF signal obtained from a beam spot for reproduction, thereby selectively detecting pits reproduced when the recording laser beam is in the ON state.

1 . An optical information recording device that records information on an optical recording medium by pulse irradiation of a recording laser beam onto the optical recording medium and that detects the information by irradiating a reproduction laser beam onto the optical recording medium, wherein 
 pulse irradiation of the recording laser beam is performed with a recording pulse having at least a high output segment and a low output segment    pulse irradiation of the reproduction laser beam is performed at a timing synchronized with the pulse irradiation of the recording laser beam, and    detection of information is performed during the high output segment and/or a constant output portion of the recording laser beam and/or the reproduction laser beam.    
     
     
         2 . An optical information recording device that records information on an optical recording medium by pulse irradiation of a recording laser beam onto the optical recording medium and that detects the information by irradiating a reproduction laser beam onto the optical recording medium, wherein the recording laser beam and the reproduction laser beam are branched from a common laser beam, comprising: 
 a pulse generating unit that generates a recording pulse having at least a high output segment and a low output segment; and    a mask unit that masks a reproduction signal obtained by the irradiation of the reproduction laser beam during the high output segment and/or a constant output portion of the recording pulse.    
     
     
         3 . An optical information recording device that records information on an optical recording medium by pulse irradiation of a recording laser beam onto the optical recording medium and that detects the information by irradiating a reproduction laser beam onto the optical recording medium, wherein the recording laser beam and the reproduction laser beam are branched from a common laser beam, comprising: 
 a pulse generating unit that generates a recording pulse having at least a high output segment and a low output segment;    a gate signal generating unit that generates a gate signal during the high output segment of the recording pulse;    a unit that specifies a time difference between the recording laser beam and the reproduction laser beam illumination of the same location on the optical recording medium;    a unit that specifies a detection target pulse having a length shorter than the gate signal; and    a detecting unit that acquires a reproduction signal obtained by the irradiation of the reproduction laser beam at the timing the detection target pulse is included in the gate signal in consideration of the time difference.    
     
     
         4 . An optical information recording device that writes information on an optical recording medium by pulse irradiation of a recording laser beam onto the optical recording medium and that detects the information by irradiating a reproduction laser beam onto the optical recording medium, wherein the recording laser beam and the reproduction laser beam are branched from a common laser beam, comprising: 
 a pulse generating unit that generates a recording pulse by calculating the logical sum of a first pulse and a second pulse;    a unit for pulse irradiation of the recording laser beam during the recording pulse;    a gate pulse generating unit that generates a gate pulse by calculating the logical multiplication of the second pulse and an inversion of the first pulse; and    a detecting unit that acquires a reproduction signal obtained by the irradiation of the reproduction laser beam during the gate pulse.    
     
     
         5 . An method of recording information on an optical recording medium by pulse irradiation of a recording laser beam on the optical recording medium and of detecting the information by irradiating a reproduction laser beam onto the optical recording medium, comprising: 
 irradiating the optical recording medium with a recording pulse having at least a high output segment and a low output segment; and    detecting the information during a high output segment and/or a constant portion of the recording laser beam.