Patent · US Expired

Viewing apparatus having oblique illumination

US5838491A · kind A · utility

8Cited by

2References

11Claims

0Family size

Assignee

Carl Zeiss Stiftung · DE

Inventors

Hartmut Gartner · Oberkochen, DE
Ulrich Lemcke · Heidenheim, DE
Christian Lucke · Oberkochen, DE
Joachim Steffen · Lauchheim, DE

Key dates

Filing date	Jul 10, 1997
Grant date	Nov 17, 1998
Priority date	—
Expiry date	Jul 10, 2017

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61B90/30
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

A viewing arrangement includes an objective (5) having a variable intersection distance and an intersection-distance dependent oblique illumination (7) which is separate from the objective (5). The oblique illumination (7) includes two illuminating beam paths (9, 11) for completely illuminating contoured objects without shadows. The illuminating beam paths (9, 11) are inclined toward each other ahead of the object (13, 16) to be viewed. The mutual inclination of the two illuminating beam paths (9, 11) is dependent upon the particular intersection distance of the objective (5).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.