Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Reexamination Certificate
2007-03-13
2007-03-13
Dinh, Tan (Department: 2627)
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
C428S064400
Reexamination Certificate
active
10257719
ABSTRACT:
An optical disc includes an information recording layer having a record of information as a pit train with a predetermined track pitch and a light-transmissive layer formed on the information recording layer so that the information can be reproduced by a beam of light illuminated through the light-transmissive layer to the information recording layer by an objective lens. The optical disc includes a feature in that a relationship of 0.194(λ/NA)2≦TP ×Tmin≦0.264(λ/NA)2is satisfied, provided that the track pitch is TP, a pit shortest length is Tmin, a wavelength of the light beam is λ and a numerical aperture of the objective lens is NA. The optical disc also includes a feature in that a pit width is 120 nm or smaller in a range of a track pitch of 0.280 to 0.325 μm.
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Nomoto Takayuki
Ohsawa Seiichi
Wada Yasumitsu
Yanagisawa Takuma
Yokogawa Fumihiko
Dinh Tan
Pioneer Corporation
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