Optical information recording medium, reproduction apparatus, and reproduction method

Abstract

The reliability of a super-resolution optical information recording medium whose capacity can be increased is increased. On an optical information recording medium ( 11 ) according to the present invention, a content is recorded as a pit group formed such that an average length Tm [nm] of a minimum mark length and a minimum space length becomes shorter than an optical system resolution limit, and reading speed information designating a reading speed in a range from 2×(4.92×Tm/149) [m/s] to less than (10000/60)×2×π×(24/1000) [m/s] is recorded as a reading speed for reproducing the content.

1 . (canceled) 
     
     
         2 . A read-only optical information recording medium on which a content is recorded as a pit group formed such that an average length Tm [nm] of a minimum mark length and a minimum space length becomes shorter than an optical system resolution limit of a reproduction apparatus in which a numerical aperture of an objective lens is 0.85 and a wavelength of a reproduction light is 405 [nm], wherein as a reading speed for reproducing the content, reading speed information designating a reading speed in a range from 2×(4.92×Tm/149) [m/s] to less than (10000/60)×2×π×(24/1000) [m/s] is recorded,
 reproduction light output information designating a reproduction light output corresponding to the reading speed indicated by the reading speed information is recorded, and 
 a frequency of a reading clock corresponding to the reading speed indicated by the reading speed information is an n multiple (n is an integer of 2 or more) of a frequency of a reading clock corresponding to a reading speed for reading the pit group formed such that the average length of the minimum mark length and the minimum space length is not less than the optical system resolution limit, 
 said read-only optical information recording medium comprising: 
 a first area in which the content is recorded; and 
 a second area in which the reading speed information is recorded as a pit group formed such that an average length of the minimum mark length and the minimum space length becomes longer than the optical system resolution limit of the reproduction apparatus, 
 the second area being disposed in a position closer to an inner periphery side than the first area. 
 
     
     
         3 . A reproduction method for reproducing a read-only optical information recording medium according to  claim 2 , comprising:
 reading the reading speed information recorded in the second area; and   reading the first area at a reading speed corresponding to the reading speed information.