Metal film recording media for laser writing
AssigneeBell Telephone Laboratories, Incorporated
InventorRonald Howard Willens
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Abstract
Thin metal film systems supported on transparent substrates are described for use in laser micromachining of high resolution facsimile images. The disclosed systems, which include a specific anti-reflection film, require less energy for micromachining than bismuth films of equal optical opacity.
Claims13
A method for recording information in a metal film recording medium by selectively removing portions of a thin radiation absorbing film supported on a flexible transparent substrate, the method comprising exposing the radiation absorbing film to modulated coherent radiation of sufficient power and duration to remove the portions, the film comprising a first layer of at least one metal selected from the group consisting of bismuth, indium, and tin and a second layer directy exposed to said modulated coherent radiation prior to said first layer, CHARACTERIZED IN THAT the material of said second layer has a refractive index substantially less than 4.0 and is selected from the group consisting of bismuth trisulfide, antimony trisulfide, and selenium.
A metal film recording medium for recording information by exposure of the medium to a laser beam, the medium consisting essentially of a flexible transparent substrate and a radiation absorbing film formed on the substrate, the film comprising a first layer of at least one metal selected from the group consisting of bismuth, indium and tin and a second layer exposed to said laser beam prior to said first layer, CHARACTERIZED IN THAT the material of said second layer has a refractive index substantially less than 4.0 and is selected from the group consisting of bismuth trisulfide, antimony trisulfide, and selenium.
Dependencies are inferred from the claim text.