Optical information recording/reproducing device capable of recording information on a moving medium and reproducing information by using reproducing light beams

An optical information recording/reproducing device comprising:

• an optical head including:
• a recording light source means for irradiating a recording optical beam onto at least one of a plurality of tracks of an optical recording medium, said optical recording medium having a plurality of information recordable tracks,
• at least one reproducing light source means:
• (a) for irradiating a first reproducing optical beam onto a position in front of a track, in a track direction, irradiated by said recording light source means, and (b) for irradiating a second reproducing optical beam onto a position in the rear of said track, in the track direction, irradiated by said recording light source means with respect to said track illuminated at least by said recording light source means,
• first light-receiving detecting means for receiving a returned light of said first reproducing optical beam from said optical recording medium and for outputting information of said track as a detection signal, and
• second light-receiving detecting means for receiving a returned light of said second reproducing optical beam from said optical recording medium and for outputting information of said track as another detection signal;
• scanning means for moving relatively with respect to said optical recording medium and said optical head to scan said track;
• and
• signal processing means for signal-processing said detection signal and said another detection signal,
• wherein said reproducing light source means irradiates said first reproducing optical beam and said second reproducing optical beam to a position in which a space in a track direction between an irradiating position of said recording optical beam and an irradiating position of said first reproducing optical beam is equal to another space in a track direction between an irradiating position of said recording optical beam and an irradiating position of said second reproducing optical beam.