Projection lens and system

US6220713A · kind A · utility

Assignee

• Compaq Computer Corporation · US

Inventors

• Biljana Tadic-Galeb · Thousand Oaks, US
• Robert E. Fischer · Westlake Village, US
• David Kappel · Künzelsau, DE
• Neil L. Condra · Diemelstraße, US
• Ann M. Muscato · Houston, US
• Sean M. Donnelly · Houston, US

Key dates

• Filing date: Oct 23, 1998
• Grant date: Apr 24, 2001
• Expiry date: Oct 23, 2018

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B21/28
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Projection lenses and projection lens systems are telecentric between an illumination subsystem and a set of imagers. The lenses and systems can exhibit color fringing correction, uniform imager illumination, athermalization, and component articulation for improved imaging. The lenses and systems may be employed in display apparatuses, such as folded display apparatuses that have decreased footprint size, but long effective projection lengths.