On-groove recordation type optical disc

Details On-groove recordation type optical disc On-groove recordation type optical disc

2007-08-28

2007-08-28

Miller, Brian E. (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S284000

Reexamination Certificate

active

11233422

ABSTRACT:
Hardness of a resin substrate of an optical disc is selected to be greater than hardness of a cover layer of the optical disc, at least when information is recorded on the optical disc. A laser beam is transmitted to an organic dye layer of the optical disc through the cover layer and a protection layer when information is recorded on the optical disc. The organic dye layer is sandwiched by the protection layer and a reflection layer. The substrate has grooves on its surface, and information is recorded between the grooves. The organic dye is heated and expands upon information recording, but a stress generated by the deforming organic dye layer is mainly transferred toward the cover layer. Deformation of the reflection layer and crosswrite upon information recording can be prevented. Therefore, the optical disc can record information between the grooves at a high density. Alternatively, the optical disc may be configured such that heat transfer toward the protection layer from the organic dye layer is set to be greater than heat transfer toward the reflection layer from the organic dye layer when the light beam is radiated for information recording.

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