The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 1976
Filed:
Jan. 07, 1976
Applicant:
Inventors:
Werner Dennhardt, Taunusstein, DT;
Herbert Schroter, Taunusstein, DT;
Assignee:
Hoechst Aktiengesellschaft, , DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
355 68 ; 354 33 ; 354 51 ; 355 69 ;
Abstract
This invention relates to a process for automatic exposure time control in the exposure of light-sensitive copying material; comprising, photoelectrically measuring the illumination in the plane of the copying material, comparing the voltage produced by the photoelectric measuring means with a reference voltage, which is inversely proportional to time, during exposure, and terminating exposure when a predetermined difference between the two voltages is reached. The invention also includes an apparatus for performing the process.