Patent ID: 7914969

Claim:
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 recording layer through the transparent 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 being highest in the range of wavelengths longer than 405 nm, an absorbance in the unrecorded portion at wavelength of 355 nm being larger than 40% of an absorbance in the unrecorded portion at the peak absorption wavelength, information being 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.