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:
Mar. 31, 1981
Filed:
Sep. 01, 1978
Juergen Doelves, Kiel, DE;
Dr. Ing. Rudolf Hell GmbH, , DE;
Abstract
A method for the improved reproduction of edges by engraving of screened printing forms by an electro-magnetic engraving member. The engraving member is controlled by a signal obtained by superposition of an image signal and a screening signal. The image signal is derived from scanning an image pattern with a resolution which is twice as great in the scanning direction as that of the printing screen. Based on the higher resolution the image signal is converted into digital principal image values and additional intermediate image values. The principal and the intermediate image values are superimposed onto the screening signal after being converted back into an analog image signal, whereby the principal image values are superimposed at the instances of periodically recurrent amplitude values of the screening signal when the tool of the engraving member has its largest deflections in the direction of the printing form for engraving the cups arranged in the printing screen. Thus, the engraving information for each cup consists of two image values, whereby the cups representing a sharp charge in tone density in the pattern are shifted relatively to the printing screen toward the higher level of density so as to accomplish improved reproduction of edges.