Light modulation system

US4091281A · kind A · utility

Assignee

• Ernst Leitz GmbH

Inventors

• Jorg Willhelm · Wetzlar, DE
• Dietmar Kaul · Solms, DE

Key dates

• Filing date: Jun 23, 1975
• Grant date: May 23, 1978
• Expiry date: Jun 23, 1995

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B26/0808
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A system for one dimensional or multi-dimensional modulation of light proportional to the path, angle or speed, preferably the photoelectric signal analysis of the movement of an object carrier in an interferometer. At least three consecutive diffraction processes take place in the optical path of which one starts from a point and of which the last condenses the light bundles into at least two points. The light bundles are guided in the same direction of diffraction fulfilling the coherence condition where the surfaces of diffraction are spaced relatively far apart and do not use imaging optics.