Patent ID: 9552838
Date: 2017-01-24
CPC Classifications: G11B

Claim:
1. An optical information recording medium comprising: a recording layer which includes (i) a first region in which information is recorded by a first pit row that includes a pit whose length is shorter than that of an optical system resolution limit of a reproduction device and (ii) a second region in which information is recorded by a second pit row that is made up of pits whose length is equal to or longer than that of the optical system resolution limit, in a case where (i) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the first pit row is defined as a first reflectance and (ii) a reflectance calculated from a reflected light amount obtained from a longest pit or a longest space in the second pit row is defined as a second reflectance, the first pit row being formed such that the first reflectance becomes substantially identical with the second reflectance, and the second region having reproduction speed information recorded therein.