Optical information medium and a method of manufacturing the...

Details Optical information medium and a method of manufacturing the... Optical information medium and a method of manufacturing the...

2007-02-06

2007-02-06

Dye, Rena L. (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S064500, C430S270130

Reexamination Certificate

active

10042660

ABSTRACT:
An optical information medium (20) for recording, such as DVR-blue, and a method for manufacturing such a medium (20) is provided. Reading from and recording onto the medium (20) is performed by means of a focused radiation beam (10) having a radiation wavelength λ and a numerical aperture NA. Said medium has a substrate (1), and a stack (2) of layers provided thereon. The stack (2) comprises at least a first recording stack (3) and k radiation beam transmissive layers (4, 5). Each transmissive layer (4, 5) has a refractive index niand an average thickness diμm and 1≦i≦k and k≧2. The thickness dkof layer k (5) is determined by a simple formula which depends on the parameters nifor i=1 . . . k and difor i=1 . . . k−1. Such a medium (20) has zero or substantially zero spherical aberration at the focal point, being at the recording layer of the first recording stack (3), of said radiation beam (10).

REFERENCES:
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patent: 6861117 (2005-03-01), Rijpers et al.
patent: 19927714 (1999-12-01), None
patent: 1047055 (2000-10-01), None
Narahara et al., “Optical Disc System For Digital Video Recording,” Japanese Journal Of Applied Physics, Publication Office Japanese Journal Of Applied Physics. Tokyo, JP, vol. 39, No. 2B, Part 1, Nov. 7, 1999, pp. 912-919.

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