Confocal microscope with a motorized scanning table

US6429897B2 · kind B2 · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Eberhard Derndinger · Aalen, DE
• Norbert Czarnetzki · Jena, DE
• Peter Ott · Lauffen am Neckar, DE
• Thomas Scherübl · Berlin, DE

Key dates

• Filing date: Feb 9, 2001
• Grant date: Aug 6, 2002
• Expiry date: Feb 9, 2021

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B21/008
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A confocal microscope has a motorized scanning table for moving the sample perpendicularly to the optical axis of the microscope. The object is illuminated simultaneously at many places by means of a light source array. The light reflected or scattered at the object is detected by means of a diaphragm array, which is conjugate to the object and to the light source array. A sensor array is provided as a detector and makes a displacement of charges possible between individual positions in the scanning direction. The sensor is a so-called TDI sensor. The displacement of the charges is synchronized with the motion of the object corresponding to the motion of the image points in the plane of the sensor array. The image data can thereby be recorded during the motion of the object, so that even large object fields can be sensed in a short time with high lateral resolution. The motion of the object takes place along linear paths (if necessary linear paths combined in a meander form) and the motion along the linear paths takes place uniformly. The microscope is particularly suitable for inspection in the semiconductor industry (wafer inspection, LCD inspection).