06528138 is referenced by 17 patents.

The optical information medium for rewritable recording by means of a laser-light beam (

14, 15

) has a first recording stack (

8

) having a phase change type recording layer (

10

), sandwiched between two dielectric layers (

9, 11

), and has a second recording stack having a phase change type recording layer (

5

), sandwiched between two dielectric layers (

3, 5

). A transparent spacer layer (

7

) is interposed between the first recording stack (

8

) and the second recording stack (

2

). A metal mirror layer (

3

) is present proximate the second recording stack (

2

) at a side remote from the transparent spacer layer (

7

). The first recording stack (

8

) has a phase change type recording layer (

10

) with substantially growth dominated or substantially nucleation dominated crystallization. The second recording stack (

2

) has a phase change type recording layer (

5

) of a kind different from the kind selected for the first recording stack (

8

). An optimal recording and erasing behavior is achieved with a laser-light write pulse strategy and a recording velocity which are substantially equal for the recording layers (

5, 10

).

Title
Optical information medium
Application Number
9/899442
Publication Number
6528138 (B2)
Application Date
July 5, 2001
Publication Date
March 4, 2003
Inventor
Hermanus Johannes Borg
Eindhoven
US
Erwin Rinaldo Meinders
Eindhoven
US
Agent
Michael E Belk
US
Assignee
Koninklijke Philips Electronics
US
IPC
B32B 3/02
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