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:
Oct. 20, 1981
Filed:
Feb. 28, 1980
Wataru Shimada, Amagasaki, JP;
Susumu Hoshinouchi, Amagasaki, JP;
Kenji Kawaguchi, Amagasaki, JP;
Akio Yoshida, Amagasaki, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
In producing a motion picture screen from a workpiece by forming a surface with a number of continuously smoothly connected minute projections, a two-dimensional cutter which has a cutting edge constituted by a number of circular arcs connected together in a smooth wavy form lengthwise, each of the arcs having a predetermined curvature .rho..sub.1 and a predetermined central angle .theta..sub.1, and the centers of the neighboring arcs being on opposite sides of the cutting edge, is used to machine the surface of the workpiece by a relative movement between the workpiece and the cutter. A surface is machined that has in a section perpendicular to the length of the cutter a number of circular arcs connected together in a smooth wavy form lengthwise, each of the arcs having a predetermined curvature of .rho..sub.2 and a predetermined central angle .theta..sub.2 and the centers of the neighboring arcs being on opposite sides of the line. The workpiece thus machined can have aluminum, etc. applied to it by a vacuum evaporation process, etc. to be directly used as a motion picture screen. Alternatively, the machined workpiece can be used as a mould or die for producing a motion picture screen by pressing a metal foil having a high reflecting property, e.g. an aluminum foil, etc. against the machined surface, the foil forming the motion picture screen.