Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2008-07-03
2010-06-01
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S275400, C369S283000
Reexamination Certificate
active
07729210
ABSTRACT:
An information recording medium1at least comprises a substrate13having a microscopic pattern20, which is constituted by a shape of continuous substance of approximately parallel grooves formed with a groove section G and a land section L alternately, a recording layer12formed on the microscopic pattern20and a light transmission layer11formed on the recording layer. The microscopic pattern20is formed so as to satisfy a relation of P<λ<NA and a thickness of the light transmission layer11is within a range of 0.07 to 0.12 mm, wherein P is a pitch of the groove section G or the land section L, λ is a wavelength of reproducing light beam and NA is a numerical aperture of an objective lens. Further, there provided an information recording medium, which is improved in cross erase and recorded in high density, and a reproducing apparatus and a recording apparatus for the information recording medium.
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Kondo Tetsuya
Oishi Kenji
Alunkal Thomas D
Connolly Bove Lodge Y Hutz LLP
Victor Company of Japan , Limited
Young Wayne R
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