Patent ID: 7960093
Filing Date: 2011-06-14
Classification: G11B,Y10S

Abstract:
1. An information storage medium comprising: a light reflective layer; a recording layer formed on the light reflective layer, the recording layer including an unrecorded portion; and a transparent layer formed on or above the recording layer, wherein light is incident to the light reflective layer through the transparent layer and the recording layer and is reflected by the light reflective layer, and the recording layer has properties of a peak absorption wavelength at which a light absorbance in the unrecorded portion is highest in the range of wavelengths longer than 405 nm, a light absorbance in the unrecorded portion at a wavelength of 405 nm being not smaller than 68% of the light absorbance at the peak absorption wavelength, information is recordable onto the recording layer by light at a wavelength of 405 nm, and an intensity of the light reflected by the light reflective layer and transmitted through a recorded portion of the recording layer being higher than an intensity of the light reflected by the light reflective layer and transmitted through the unrecorded portion, the recorded portion forms marks, and a whole or a part of one of the marks is formed in a groove region.