Anti-reflection coating

Claim 2

An optical device comprising: a transparent base plate; a first layer formed of a substance having a refractive index of 1.58 or higher; and a second layer which is farther from said transparent base plate than said first layer is from said transparent base plate and which is formed of an amorphous transparent fluorocarbon resin having a refractive index of 1.35 or lower, said first layer and said second layer constituting a film for preventing reflection.

Claim 3

An optical device according to Claim 1, wherein said first layer and said second layer are formed by applying to said transparent base plate coating liquids obtained by dispersing or dissolving the respective materials of said first layer and said second layer in organic solvents.

Claim 4

An optical device according to Claim 1 or 2, wherein said first layer is formed by any one of the following methods: a method in which said first layer is formed on an adhesive layer provided on said transparent base plate; a method in which ultraviolet-ozone treatment is performed on a surface of said transparent base plate, and said first layer is formed on the ultraviolet-ozone treated surface of said transparent base plate; a method in which corona-discharge treatment is performed on a surface of said transparent base plate, and said first layer is formed on the corona-discharge treated surface of said transparent base plate; a method in which plasma treatment is performed on a surface of said transparent base plate, and said first layer is formed on the plasma treated surface of said transparent base plate; a method in which ultraviolet-ozone treatment is performed on a surface of said transparent base plate, and an adhesive layer is formed on the ultraviolet-ozone treated surface of said transparent base plate, and then said first layer is formed on said adhesive layer; a method in which corona-discharge treatment is performed on a surface of said transparent base plate, and an adhesive layer is formed on the corona-discharge treated surface of said transparent base plate, and then said first layer is formed on said adhesive layer; or a method in which plasma treatment is performed on a surface of said transparent base plate, and an adhesive layer is formed on the plasma treated surface of said transparent base plate, and then said first layer is formed on said adhesive layer.

Claim 5

An optical device according to Claim 1 or 2, wherein said second layer is formed by any one of the following methods: a method in which said second layer is formed on an adhesive layer provided on said first layer; a method in which ultraviolet-ozone treatment is performed on the surface of said first layer, and said second layer is formed on the ultraviolet-ozone treated surface of said first layer; a method in which corona-discharge treatment is performed on the surface of said first layer, and said second layer is formed on the corona-discharge treated surface of said first layer; a method in which plasma treatment is performed on the surface of said first layer, and said second layer is formed on the plasma treated surface of said first layer; a method in which ultraviolet-ozone treatment is performed on the surface of said first layer, and an adhesive layer is formed on the ultraviolet-ozone treated surface of said first layer, and then said second layer is formed on said adhesive layer; a method in which corona-discharge treatment is performed on the surface of said first layer, and an adhesive layer is formed on the corona-discharge treated surface of said first layer, and then said second layer is formed on said adhesive layer; or a method in which plasma treatment is performed on the surface of said first.layer, and an adhesive layer is formed on the plasma treated surface of said first layer, and then said second layer is formed on said adhesive layer.

Claim 6

An optical device according to Claim 1 or 2, wherein said first layer has an optical thickness n l d 1 which satisfies either one of the following inequalities: or and said second layer has an optical thickness n 2 d 2 which satisfies the following inequality: where k and L are positive odd numbers; n 1 and n 2 are the refractive indexes of said first layer and said second layer, respectively; d 1 and d 2 are the thickness of said first layer and said second layer, respectively; and λ 1 and X 2 are the designed wavelengths of said first layer and said second layer, respectively, which are exactly or approximately the same and selected from a wavelength range of 400-900 nm.

Claim 7

An optical device according to Claim 1 or 2, wherein said first layer contains fine particles of a metal oxide and a binding agent.

Claim 8

An optical device according to Claim 6, wherein said metal oxide is selected from the group consisting of: titanium Ti, cerium Ce, zirconium Zr, tin Sn, antimony Sb, and tantalum Ta.

Claim 9

An optical device according to Claim 1 or 2, wherein said first layer is formed of a macromolecular resin.

Claim 10

An optical device according to Claim 8, wherein said macromolecular resin is selected from the group consisting of: polystyrene, polycarbonate, polystyrene derivatives, polycarbonate derivatives, and polymethylmethacrylate derivatives.

Claim 11

An optical device comprising a base plate and first and second layers on the base plate which are of differing refractive index and are arranged to reduce reflection from the device.

Claim 12

An optical device comprising a base plate and first and second layers on the base plate which are of differing refractive index and are arranged to reduce reflection from the device.