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An information recording medium comprises a read-out track having a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control. The servo bits have a first groove that is deep in a direction perpendicular to both a length of the read-out trac

An information recording medium comprises a read-out track having a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control. The servo bits have a first groove that is deep in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium, and a second groove that is deep in a direction opposite to the first groove and having a depth gradually increasing along the read-out track.

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What is claimed is: 1. An information recording medium comprising: a read-out track having a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control, the servo bits having a first groove that is deep in a direction perpendicular to both a

What is claimed is: 1. An information recording medium comprising: a read-out track having a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control, the servo bits having a first groove that is deep in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium, and a second groove that is deep in a direction opposite to the first groove and having a depth gradually increasing along the read-out track. 2. An information recording medium as claimed in claim 1; wherein the first groove and the second groove are triangular in section taken in the direction perpendicular to the length of the read-out track. 3. An information recording medium as claimed in claim 1; wherein the first groove and the second groove have a stepped cross-section taken in the direction perpendicular to the length of the read-out track. 4. An information recording medium comprising: a read-out track having a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control, the servo bits having a first groove extending in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium, and a second groove extending in a direction opposite to the first groove. 5. An information reproducing apparatus comprising: an information recording medium having on a read-out track a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control, the servo bits being arranged with a constant deviation alternately left and right with respect to a center axis of the read-out track; a reproducing probe for reading the read-out track, the reproducing probe having a microscopic aperture for producing near-field light and for directing the near-field light toward the read-out track during reading of the read-out track so that the near-field light is scattered by the servo bits formed in the servo pattern region of the read-out track; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light by the servo data and for outputting a detection signal; comparison operating means for comparing a detection signal outputted from the photo-detecting means with a synchronization signal determined in accordance with an interval of the servo bits and for generating and outputting a differential signal; and reproducing-probe-position control means for controlling a position of the reproducing probe in accordance with a differential signal outputted by the comparison operating means. 6. An information reproducing apparatus comprising: an information recording medium having on a read-out track a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control, the servo bits having a first groove that is deep in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium, and a second groove that is deep in a direction opposite to the first groove and having a depth gradually increasing along the read-out track; a reproducing probe for reading the read-out track, the reproducing probe having a microscopic aperture for producing near-field light and for directing the near-field light toward the read-out track during reading of the read-out track so that the near-field light is scattered by the servo bits formed in the servo region of the read-out track; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light by the servo data and for outputting a detection signal; comparison operating means for comparing a detection signal outputted from the photo-detecting means with a synchronization signal determined in accordance with an interval of the servo bits and for generating and outputting a differential signal; and reproducing-probe-position control means for controlling a position of the reproducing probe in accordance with a differential signal outputted by the comparison operating means. 7. An information reproducing apparatus comprising: an information recording medium having on a read-out track a data region forming data bits for reproduced data and a servo pattern region forming servo bits for tracking control, the servo bits having a first groove extending in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium, and a second groove extending in a direction opposite to the first groove; a reproducing probe for reading the read-out track, the reproducing probe having a microscopic aperture for producing near-field light and for directing the near-field light toward the read-out track during reading of the read-out track so that the near-field light is scattered by the servo bits formed in the servo region of the read-out track; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light by the servo data and for outputting a detection signal; comparison operating means for comparing a detection signal outputted from the photo-detecting means with a synchronization signal determined in accordance with an interval of the servo bits and for generating and outputting a differential signal; and reproducing-probe-position control means for controlling a position of the reproducing probe in accordance with a differential signal outputted by the comparison operating means. 8. An information reproducing apparatus comprising: an information recording medium containing a unit of information comprised of a groove having a depth which increases constantly or gradually in a direction perpendicular to both a length of the read-out track and a depth of the information recording medium; a reproducing,probe for reading the read-out track, the reproducing probe having a microscopic aperture for producing near-field light and for directing the near-field light toward the read-out track during reading of the read-out track so that the near-field light is scattered by the servo bits formed in the servo region of the read-out track; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light by the servo data and for outputting a detection signal; and reproducing-probe-position control means for controlling a position of the reproducing probe in accordance with an intensity of the detection signal outputted by the photo-detecting means. 9. An information reproducing apparatus comprising: an information recording medium having a groove containing a unit of information, the groove being saw tooth-shaped in a section taken in a direction perpendicular to a read-out direction, the unit of information being formed along a slant surface of the saw tooth-shaped groove; a reproducing probe for reading the read-out track, the reproducing probe having a microscopic aperture for producing near-field light and for directing the near-field light toward the read-out track during reading of the read-out track so that the near-field light is scattered by the servo bits formed in the servo region of the read-out track; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light by the servo data and for outputting a detection signal; and reproducing-probe-position control means for controlling a position of the reproducing probe in accordance with an intensity of the detection signal outputted by the photo-detecting means. 10. An information reproducing apparatus comprising: an information recording medium having a read-out track containing information; a reproducing probe for reading the read-out track of the information recording medium, the reproducing probe having microscopic apertures for producing near-field light and for directing the near-field light toward the read-out track during reading of the read-out track so that the near-field light is scattered by the information contained in the read-out track, the microscopic apertures extending at an interval in a direction perpendicular to both a direction of the read-out track and a direction of a depth of the information recording medium; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light by the information contained in the read-out track and for outputting a detection signal; and reproducing-probe-position control means for controlling a position of the reproducing probe in accordance with an intensity of the detection signal outputted by the photo-detecting means. 11. An information recording/reproducing apparatus comprising: an information recording medium comprised of a read-out track having a slant surface and a unit of information formed along the slant surface, the read-out track being asymmetric about an axis extending in a direction generally perpendicular to a scanning direction of a probe for recording/reproducing the unit information of the read-out track; a probe for recording/reproducing the unit of information of the read-out track of the information recording medium, the probe having a microscopic aperture for producing near-field light and for directing the near-field light toward the read-out track so that the near-field light is scattered by the unit of information of the read-out track; photo-detecting means for detecting reflection scattering light generated as a result of the scattering of the near-field light and for outputting a detection signal; and probe-position control means for controlling a position of the probe in accordance with an intensity of the detection signal or a differential signal between the detection signal and a reference signal. 12. An information recording medium comprising: a read-out track having a servo pattern region; and a plurality of servo bits formed in the servo pattern region for tracking control, the servo bits having first grooves extending deep in a direction perpendicular to both a depth of the information recording medium and a length of the read-out track, and second grooves extending deep in a direction opposite to the first grooves and alternating with the first grooves. 13. An information recording medium according to claim 12; wherein each of the first grooves has a depth which gradually increases along the read-out track.