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:
Jul. 04, 1995
Filed:
Dec. 21, 1992
Yutaka Tamura, Kyoto, JP;
Shinji Shiraishi, Kyoto, JP;
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Abstract
In order to prevent a line break phenomenon in reproduction of an image of an original in halftone dots, RGB signals of an original (2) are contour-enhanced by a USM circuit (10), and inputted in a halftone dot signal producing circuit (30) and an edge signal producing circuit (40). The halftone dot signal producing circuit (30) converts image signals (Y-IMA to Bk-IMA) to halftone dot signals (DOT1 to DOT10) at the timing of a clock signal (CL1), to output the halftone dot signals (DOT1 to DOT10) to a synthesizing circuit (11) in response to a first output start signal (ENST). However, an output start time is delayed from the time of receiving the signal (ENST) by a time required for the halftone dot processing. On the other hand, an edge signal producing circuit (40) produces a contour signal (BE, WE) from the image signals at the timing of a clock signal (CL2) having a higher frequency than the clock signal (CL1), and outputs the same in response to a second output start signal (ENSTD) which is delayed by the aforementioned time from the signal (ENST). The synthesizing circuit (11) synthesizes the halftone dot signals (DOT1 to DOT10) with the contour signal (BE, WE), thereby producing exposure signals (EX1 to EX10).