Optical disc having substrates with a specified thickness/diamet

Details Optical disc having substrates with a specified thickness/diamet Optical disc having substrates with a specified thickness/diamet

1997-08-25

1999-08-10

Letscher, George J.

Dynamic information storage or retrieval

Storage medium structure

Layered

G11B 724

Patent

active

059369345

ABSTRACT:
An optical disc is constructed by joining a pair of resin substrates through an adhesive layer so that information carrying means is disposed inside. The resin substrate has a diameter-to-thickness ratio d/t.gtoreq.180. The adhesive layer has a Young's modulus of 0.1-1 kgf/mm.sup.2 at 20.degree. C. and a mechanical dissipation factor (tan.delta.) of 0.6-5.0 at 20.degree. C. The adhesive layer is formed of a hot melt adhesive, pressure-sensitive adhesive, room temperature curable adhesive or ultraviolet curable adhesive. The disc is resistant to both heat and vibration.

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