Autofocusing arrangement for a stereomicroscope which permits automatic focusing on objects on which reflections occur

US5288987A · kind A · utility

Assignee

• Carl Zeiss Stiftung · DE

Inventors

• Uwe Vry · Aalen, DE
• Christian Lucke · Oberkochen, DE
• Ulrich Sander · Rebstein, CH
• Werner Muller · Oberkochen, DE
• Joachim Luber · Oberkochen, DE
• Klaus Knupfer · Oberkochen, DE
• Thomas Hellmuth · Danville, US
• Rudiger Duchateau · Aalen, DE
• Hartmut Wolf · Bellinghauserhohn, DE

Key dates

• Filing date: Sep 24, 1992
• Grant date: Feb 22, 1994
• Expiry date: Sep 24, 2012

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B21/22
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The invention relates to a high-precision autofocusing arrangement for a stereomicroscope wherein a bar-shaped marking is projected via a cylinder optic on an object. The imaged bar-shaped marking is at least in one dimension less or equal to the resolution of the viewing beam path. A region of the objective not used optically is selected for projection as the pass-through pupil.