System for selectively controlling the spectral make-up of visible light from a source thereof

US5333034A · kind A · utility

Assignee

• Bremson Data Systems, Inc. · US

Inventors

• Xue M. Gu · Shawnee, US
• David B. Johnson · Mason, US
• Michael S. Haines · Nettetal, DE
• Louis P. Armstrong · Kansas City, US

Key dates

• Filing date: Jan 31, 1992
• Grant date: Jul 26, 1994
• Expiry date: Jan 31, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B27/547
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A preferred photographic printer (10) includes light filters (52, 54, 56) which can be shifted to selected positions for filtering respective spectral components from selected portions of a light beam (100) in order to vary the spectral make-up of the light beam, and further includes a preferred metal halide lamp (48) which produces a spectral output with substantial portions in the visible band.