Apparatus and method for producing optical data carriers

US7862750B2 · kind B2 · utility

Assignee

• Thomson Licensing · FR

Inventors

• Erwin Buerkle · Penzberg, DE
• Martin Eichlseder · Tettenweis, DE

Key dates

• Filing date: Sep 26, 2007
• Grant date: Jan 4, 2011
• Expiry date: Apr 21, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S425/81
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A device and a method are disclosed for producing an optical data medium, in particular high density optical media, such as the recently developed BlueRay™ disk for illumination with a blue laser (λ≈405 nm). The required thickness of the data and/or protective layers is of the order of at most several tenths of millimeters. Such thin layers are difficult to produce with conventional injection molding processes. The disclosed device and method solve this problem by overflowing an element placed in a narrow cavity with a low-viscosity material having a viscosity lower than the viscosity of polycarbonate, which then forms the data or protective layer, or by bonding a layer produced in this manner to another layer using a low-viscosity adhesive.