Filters for photo-detectors

US4158133A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Werner Spaeth · Holzkirchen, DE
• Laszlo Bacs · Schwanau, DE

Key dates

• Filing date: Aug 16, 1977
• Grant date: Jun 12, 1979
• Expiry date: Aug 16, 1997

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10F77/337
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Optical filters are directly mounted on the surface of photo-detectors. The filters have maximum radiation permeability for the operating range of the photo-detector. For that region of the spectrum which lies outside of the operating range, the filters are of maximum impermeability and considerably decrease interfering currents resulting from the incidence of foreign light. The direct mounting of the filters on the detector surface effects not only technical but also economical advantages.