Composite mask for producing a diffuser

US7473521B2 · kind B2 · utility

Assignee

• Tomoegawa Corporation · JP

Inventors

• Takamasa Harada · Oberursel, DE
• Fumio Kita · Wiesbaden, DE
• Andreas Zimmermann · Griesheim, DE
• Andreas Altherr · Friedrichsthal, DE
• Martin Mennig · Idar-Oberstein, DE
• Peter W. Oliveira · Riegelsberg, DE
• Helmut Schmidt · Riegelsberg, DE

Key dates

• Filing date: Dec 6, 2002
• Grant date: Jan 6, 2009
• Expiry date: Mar 14, 2024

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/258
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to an alternative composite mask that is substantially composed of a transparent support film coated with a transparent polymer matrix that contains light-absorbing pigment particles or metal particles having an average particle size d50 ranging between 0.5 and 10 μm.