Stock material or miscellaneous articles – Circular sheet or circular blank
Reexamination Certificate
2005-05-17
2005-05-17
Mulvaney, Elizabeth (Department: 1774)
Stock material or miscellaneous articles
Circular sheet or circular blank
C428S064500, C428S064600, C430S270130
Reexamination Certificate
active
06893698
ABSTRACT:
An optical information recording medium having two or more information layers, wherein the irradiation of either the information layer with a laser beam converging thereon causes information signals to be recorded or reproduced; the nearer positioned information layer than the farthest information layer as viewed from the incidence side of the laser beam has a recording layer varying between two optically detectable states, andin-line-formulae description="In-line Formulae" end="lead"?0≦|Tc−Ta|/Tc≦0.1in-line-formulae description="In-line Formulae" end="tail"?where Tcis the transmittance of the nearer positioned information layer when the recording layer is in state (a) and Ta, the transmittance, when it is in state (b). This makes possible accurate accurately recording and reproduction of information onto and out of the farther information layer irrespective of whether or not any information is recorded on the nearer information layer.
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Kojima Rie
Miyagawa Naoyasu
Narumi Kenji
Nishihara Takashi
Nishiuchi Ken'ichi
Mulvaney Elizabeth
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