Method for producing a motion picture screen

Details Method for producing a motion picture screen Method for producing a motion picture screen

1980-02-28

1981-10-20

Hoffman, James R.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

83861, 427163, G03B 2156, G03B 2160

Patent

active

042959063

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.

REFERENCES:
patent: 2961926 (1960-11-01), Hoffmeister
patent: 3263561 (1966-08-01), Jackson

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