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:
Feb. 25, 1997
Filed:
Oct. 25, 1994
Ryoji Hirai, Mobara, JP;
Yuuichi Inoue, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Curve surface shapes Z.sub.X, Z.sub.Y on the long axis and short axis of at least the outer surface of a face plate are approximated by Z.sub.X =A.sub.1 X.sup.2 +A.sub.2 X.sup.4 +A.sub.3 X.sup.6 and Z.sub.Y =A.sub.4 Y.sup.2 +A.sub.5 Y.sup.4 +A.sub.6 Y.sup.6, and the curved surface shapes P.sub.X, P.sub.Y of at least the outer surface of the face plate panel at points (X=X.sub.1, Y=Y.sub.1) of effective screen boundary portions are given by P.sub.X =A.sub.1 X.sub.1.sup.2 /(A.sub.1 X.sub.1.sup.2 +A.sub.2 X.sub.1.sup.4 +A.sub.3 X.sub.1.sup.6) and P.sub.Y =A.sub.4 Y.sub.1.sup.2 /(A.sub.4 Y.sub.1.sup.2 +A.sub.5 Y.sub.1.sup.4 +A.sub.6 Y.sub.1.sup.6), wherein 0.6<P.sub.X .ltoreq.0.9 and 0.6.ltoreq.P.sub.Y .ltoreq.1.0 are satisfied. The curvature radii R (mm) of the effective screen boundary portion of the short side and long side satisfy the relationship: 2.0 (42.5 V+45.0)<R.ltoreq.4.0 (42.5 V+45.0), where the effective diagonal diameter of the face plate panel is V (inches). This enables a flatter periphery, less distorted panel surface and less doming effect.