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:
Apr. 24, 1990
Filed:
Dec. 14, 1988
Alex Vinatzer, Brixen/Milland, IT;
Durst Phototechnik GmbH, Bozen, IT;
Abstract
A method for determining the exposure time in photographic copying includes measuring the light intensity at different measuring points of the projected picture of the original to be copied for an initial copying light intensity, and forming a mean value of the light intensity values measured at such points; the exposure time for a current copying light intensity is determined by modifying the aforementioned mean value with a proportional action factor corresponding to the ratio of the light intensity value measured at a selected one of the measuring points for the current copying light intensity relative to the light intensity value measured at the same point for the initial copying light intensity. An apparatus for determining the exposure time in accordance with such method includes a microprocessor which determines the ratio of the aforementioned light intensity value measured at the selected measuring point for the current copying light intensity relative to the value measured at the same point for the initial copying light intensity; the microprocessor determines the exposure time as a result of the aforementioned mean value as modified by the aforementioned ratio.