Patent · US Expired

Method of projecting film frames and microfilm reader for carrying out same

US4666272A · kind A · utility

1Cited by

7References

12Claims

0Family size

Assignee

MAP Mikrofilm Apparatebau, Dr. Poehler GmbH & Co. KG · DE

Inventors

Hermann Poehler · Ober-Mörlen, DE
Peter Dziemba · Bad Nauheim, DE

Key dates

Filing date	Oct 10, 1985
Grant date	May 19, 1987
Priority date	—
Expiry date	Oct 10, 2005

Classification

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

Abstract

A microfilm reader with a lens holder moved independently of a lighting unit at right angles in relation to the beam path by means of a drive unit. This renders it possible to correctly position any of a plurality of lenses arranged side by side in the lens holder in relation to the frame to be projected. Given that the lighting unit and the lens holder are capable of moving independently of each other, it is furthermore possible to shift the lighting unit into a position above the respective frame to be projected to obtain an image that is optimally illuminated.

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