Optical recording medium and optical recording/reproducing appar

Details Optical recording medium and optical recording/reproducing appar Optical recording medium and optical recording/reproducing appar

1999-10-12

2000-06-20

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369283, G11B 724

Patent

active

060785608

ABSTRACT:
A high-density optical recording medium and an optical recording/reproducing apparatus uses short wavelength blue laser beams to perform recording and reproducing. A 0.6-mm thick light-transmitting layer is formed on an information-recording face of the recording medium. A laser beam having a wavelength .lambda. of 390 nm.ltoreq..lambda..ltoreq.440 nm is transmitted via a lens system having an NA of 0.6.ltoreq.NA.ltoreq.0.72, through the light-transmitting layer. The optical recording medium allows recording and/or reproducing to be performed by use of the laser beam. Variation in the thickness of the light-transmitting layer is within a range of .+-.5.98 .lambda./(NA).sup.4.

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