Hybrid disc and method and apparatus for discriminating same

Details Hybrid disc and method and apparatus for discriminating same Hybrid disc and method and apparatus for discriminating same

2005-08-16

2005-08-16

Miller, Brian E. (Department: 2652)

Dynamic optical information storage or retrieval

Optical storage medium structure

C369S013020, C369S286000

Reexamination Certificate

active

06931654

ABSTRACT:
A DVD playback apparatus accurately discriminates a hybrid disc, to prevent a recordable CD installed therein from being damaged by a laser beam for a DVD/MMCD. The hybrid disc includes a label printed surface formed on a substrate, a CD recording surface formed below the label printed surface, having identification information expressing a disc type, and a DVD recording surface formed below the CD recording surface. The DVD playback apparatus irradiates a CD laser beam on an optical disk installed therein. If data is readable from the optical disc, it is checked whether the identification information is recorded in the predetermined recording area. The DVD playback apparatus recognizes the optical disc as the hybrid disc, if the identification information is recorded in the predetermined recording area.

REFERENCES:
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patent: 5694381 (1997-12-01), Sako
patent: 5896355 (1999-04-01), Sato et al.
patent: 5959946 (1999-09-01), Tognazzini
patent: 6307824 (2001-10-01), Kuroda et al.
patent: 6320840 (2001-11-01), Oh et al.
patent: 6587424 (2003-07-01), Kuroda et al.

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