G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/0037 (2006.01) G11B 7/007 (2006.01) G11B 7/013 (2006.01) G11B 7/24 (2006.01) G11B 11/105 (2006.01) G11B 23/00 (2006.01) G11B 23/03 (2006.01)
Patent
CA 2310706
An optical recording medium is provided which has a substrate and a signal recording layer provided on the substrate and in which an information signal is recorded in the form of microscopic pits. A light beam is focused on the signal recording layer and some change of the light beam carried by a return light from the signal recording layer is detected to read the information signal recorded on the signal recording layer. The optical recording medium has a diameter of 65 mm or less and a thickness of 0.4 to 0.7 mm. An information signal recording area extends outwardly from a radial position of 12.5 mm or less from the center of the medium. The ratio in area between the information signal recording area and non-signal recording area is 3.4 or more. The storage capacity of this medium is 2 gigabytes or more. The optical recording medium has formed at the center thereof a center hole around which an annular table-abutment convexing to one side of the medium is formed. A magnetic-clamping hub is installed in the center hole and thus the medium is magnetically clamped to a rotation driving mechanism of an optical recording and/or reproducing apparatus. The compactness and high density of recording of the optical recording medium will contribute greatly to a further compact structure of a recording and/or reproducing apparatus in which the medium is to be used.
Aoki Yoshitaka
Fujiie Kazuhiko
Kaeriyama Takuya
Maeda Yasuaki
Netsu Naohiro
Gowling Lafleur Henderson Llp
Sony Corporation
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