Patent · US Expired

Objective lens exchanging arrangement in a microfilm reader

US4371242A · kind A · utility

2Cited by

3References

12Claims

0Family size

Assignee

Agfa-Gevaert NV · BE

Inventors

Karl-Heinz Dietrich · Munich, DE
Josef Gruber · Gleisdorf, AT
Walter Rauffer · Munich, DE
Peter Nassl · Gauting, DE

Key dates

Filing date	Dec 11, 1980
Grant date	Feb 1, 1983
Priority date	—
Expiry date	Dec 11, 2000

Classification

Technology area (CPC G)Physics
CPC primaryG03B21/111
WIPO fieldOptics
WIPO sectorInstruments

Abstract

In a microfilm reader, an objective lens tube removal or exchanging arrangement which includes a cylindrically shaped supporting casing for the objective lens tube. The objective lens tube is, for focusing purposes, slidably adjustably mounted along its optical axis in the cylindrically shaped supporting casing. The cylindrically shaped supporting casing has an opening which is sufficiently large to permit the removal or exchange of the objective lens tube therethrough in a direction substantially normal to the optical axis of the objective lens.

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