Measurement of the positions of centres of curvature of optical surfaces of a single or multi-lens optical system

US9863844B2 · kind B2 · utility

Assignee

• Trioptics GmbH · DE

Inventors

• Naoji Oya · Shizuoka, JP
• Aiko Ruprecht · Wedel, DE
• Eugen Dumitrescu · Wedel, DE

Key dates

• Filing date: Aug 10, 2017
• Grant date: Jan 9, 2018
• Expiry date: Aug 10, 2037

Classification

• Technology area (CPC G): Physics
• CPC primary: G01M11/0221
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a method for measuring the positions of centers of curvature of optical surfaces of a single- or multi-lens optical system, an imaging lens system images an object plane into a first and a second image plane. The first image plane is produced by a first ancillary lens system having a first focal length and defining a first beam path, while the second image plane is produced by a second ancillary lens system having a second focal length that is different from the first focal length and defining a second beam path that is different from the first beam path. An object arranged in the object plane is then imaged simultaneously or sequentially at the first and the second image plane by means of measuring light. Reflections of the measuring light at optical surfaces of the optical system are detected by means of a spatially resolving light sensor. The actual positions of the first and the second center of curvature are calculated from the detected reflexes.