Patent ID: 8854938
Filing Date: 2014-10-07
Classification: G11B

Abstract:
1. An optical recording medium formed with a bar code-shaped reflection pattern by forming a high reflection rate region and a low reflection rate region, which appear alternately when seen in a track line direction, in such a state that each is continuous in a track pitch direction, the optical recording medium comprising a recording region in which information is recorded with the reflection pattern, wherein the low reflection rate region is formed with a pit string, and the high reflection rate region and the low reflection rate region are formed to satisfy: S+M/2≦0.6H, where a signal level of a reproduction signal obtained from a reflection light in the high reflection rate region is denoted as “H”, a signal level of a reproduction signal obtained from a reflection light in the low reflection rate region is denoted as “S”, and a degree of modulation of the reproduction signal obtained from the reflection light in the low reflection rate region is denoted as “M”.