OPTICAL RECORDING MEDIUM, PROCESS FOR THE PRODUCTION THEREOF, MASTER STAMPER FOR OPTICAL RECORDING MEDIUM AND PROCESS FOR THE PRODUCTION THEREOF

WIPO Patent Application WO2005006313

A3

The optical recording medium comprises a light-transmitting substrate 11 having a spiral groove 11a formed thereon and a recording layer 21 containing an organic dye wherein the average inclination angle thetaa of the wall of the groove 11a on the inward side thereof is greater than the average inclination angle thetab of the wall of the groove on the outward side thereof. In this arrangement, when the recording layer 21 is formed by a spin coating method, the dispersion of the thickness of the recording layer 21 inside the groove 11a can be prevented, making it assured that the recording layer 21 can be provided with a desired thickness over an area inside the groove 11a ranging from the inward side thereof to the outward side thereof. As a result, heat of laser beam emitted during recording can be almost uniformly dissipated over the area inside the groove ranging from the inward side to the outward side thereof to eliminate the effect of thermal interference between marks, making it possible to secure a wide power margin during a high speed recording.

HORAI TAKASHI (JP)
KAWAGUCHI YUICHI (JP)

PCT/JP2004/010151

May 19, 2005

July 09, 2004

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TDK CORP (JP)
HORAI TAKASHI (JP)
KAWAGUCHI YUICHI (JP)

G11B7/007; G11B7/24073; G11B7/24076; G11B7/24082; G11B7/24085; G11B7/244; G11B7/246; G11B7/26; (IPC1-7): G11B7/007; G11B7/26

EP0911820A1	1999-04-28
EP1124220A2	2001-08-16

PATENT ABSTRACTS OF JAPAN vol. 2000, no. 14 5 March 2001 (2001-03-05)
PATENT ABSTRACTS OF JAPAN vol. 014, no. 050 (P - 0998) 30 January 1990 (1990-01-30)

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