System for providing electrolessly nickel coated polished high speed multi-faceted polygonal scanners

Claim 2

A process for providing high speed multi-faceted polygonal scanners comprising providing a precisely machined aluminum polygon having a multiplicity of smoothly machined facet faces, electrolessly plating said aluminum polygon with nickel and polishing the nickel coated faces to a mirrorlike finish.

Claim 3

The process as defined in claim 1 wherein said aluminum alloy is designated as 7075-T651 having the following properties: ______________________________________ ______________________________________ Nominal Chemical Composition Zinc 5.6% Magnesium 2.5% Copper 1.6% Chromium 0.3% Aluminum Balance (incl. normal impurities) ______________________________________ Typical Tensile Strength, psi 83,000 Mechanical Yield Strength, psi 73,000 Properties Elongation, % in 2" 11 Shear Strength, psi 48,000 Brinell Hardness 10/500 150 Typical Density, Lbs./Cu. In. 0.101 Physical Melting Range, approx. °F. 890-1180 Properties Electrical Conductivity, % IACS at 20° C. (68° F.) 33 Thermal Conductivity, btu at 25° C. (77° F.) 900 Average Coefficient of Thermal Expansion at 68° to 212° F. 0.0000131 ______________________________________

Claim 4

The process as defined in claim 1 wherein said aluminum polygon is electrolessly nickel coated to at least about 0.0020 inches.

Claim 5

The process as defined in claim 1 wherein said electrolessly nickel coated polygon is further coated with aluminum and then silicon monoxide to provide maximum reflectivity and durability.

Claim 6

A high speed multi-faceted polygonal scanner comprising a precisely machined aluminum alloy polygon having a multiplicity of smoothly machined facet faces and an electrolessly plated nickel coating over said aluminum polygon, said nickel coating having been polished to a mirror-like finish and said aluminum polygon comprising an aluminum alloy designated as 7075-T651 having the following properties: ______________________________________ ______________________________________ Nominal Chemical Composition Zinc 5.6% Magnesium 2.5% Copper 1.6% Chromium 0.3% Aluminum Balance (incl. normal impurities) ______________________________________ Typical Tensile Strength, psi 83,000 Mechanical Yield Strength, psi 73,000 Properties Elongation, % in 2" 11 Shear Strength, psi 48,000 Brinell Hardness 10/500 150 Typical Density, Lbs./Cu. In. 0.101 Physical Melting Range, approx. °F. 890-1180 Properties Electrical Conductivity, % IACS at 20° C. (68° F.) 33 Thermal Conductivity, btu at 25° C. (77° F.) 900 Average Coefficient of Thermal Expansion at 68° to 212° F. 0.0000131 ______________________________________

Claim 7

A high speed multi-faceted polygonal scanner comprising a precisely machined aluminum alloy polygon having a multiplicity of smoothly machined facet faces and an electrolessly plated nickel coating over said aluminum polygon, said nickel coating having been polished to a mirror-like finish and said aluminum polygon comprising an aluminum alloy designated as 7075-T651 having the following properties: ______________________________________ ______________________________________ Nominal Chemical Composition Zinc 5.6% Magnesium 2.5% Copper 1.6% Chromium 0.3% Aluminum Balance (incl. normal impurities) ______________________________________ Typical Tensile Strength, psi 83,000 Mechanical Yield Strength, psi 73,000 Properties Elongation, % in 2" 11 Shear Strength, psi 48,000 Brinell Hardness 10/500 150 Typical Density, Lbs./Cu. In. 0.101 Physical Melting Range, approx. °F. 890-1180 Properties Electrical Conductivity, % IACS at 20° C. (68° F.) 33 Thermal Conductivity, btu at 25° C. (77° F.) 900 Average Coefficient of Thermal Expansion at 68° to 212° F. 0.0000131 ______________________________________