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:
Dec. 06, 1994
Filed:
Oct. 07, 1993
Takashi Sakamoto, Tenjinkitamachi, JP;
Dainippon Screen Mfg. Co., Ltd., Kyoto, JP;
Abstract
Screen angles .theta.1, .theta.2 and .theta.3 of first through the third halftone images, which are strongly related to the generation of moire, are determined by setting values of integers m1, n1, m2, n2, m3 and n3 which defines the screen angles by tan.theta.1=n1/m1, tan.theta.2=n2/m2, tan.theta.3=n3/m3. Suppose that first through third square areas for the first through third halftone dots have side lengths of L1, L2 and L3, which are integers, the first through third square areas includes (m1.sup.2 +n1.sup.2), (m2.sup.2 +n2.sup.2), and m3.sup.2 +n3.sup.2) pieces of halftone dots, respectively. The values of the integers is determined to satisfy: m1/L1-m2/L2=n3/L3; and -n1/L1+n2/L2=m3/L3.