An optical disk of the type including guide grooves is improved by regulating the width of the grooves, and thus the width of the adjacent land portion, in accordance with the type of information recorded at that part of the land.
申请公布号
US4947384(A)
申请公布日期
1990.08.07
申请号
US19880180500
申请日期
1988.04.12
申请人
PIONEER ELECTRONIC CORPORATION;PIONEER VIDEO CORPORATION