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US 3,943,302 AGranted
Electron beam recording in thick materials
AssigneeRCA Corporation
InventorLoren Bainum Johnston, Jr.
Life of this patent
Estimating the term…
Abstract
A method of producing a high resolution information storage disc includes the steps of forming a grooved disc coated with an electron beam sensitive material, exposing the coated disc to a signal modulated electron beam, replicating the exposed disc to form a second disc of opposite contour, and utilizing the second disc to produce discs having positive-shaped groove and signal information.
Claims13
A method of forming an information storing medium comprising the steps of:
- forming upon a first disc substrate, a spiral-grooved surface having peak, valley and wall regions covered with a continuous coating of electron beam sensitive material;
- forming a topography in said spiral groove representative of information to be stored by exposing said spiral groove to an electron beam modulated according to said information such that said electron beam does not pierce completely through said continuous coating to said substrate to thereby avoid overexposure of said coating by electron beam reflection off said substrate, and removing portions of said material in accordance with the pattern of exposure such that said wall and valley regions of said spiral groove include a continuous residuum of said material therein;
- and
- replicating said exposed disc to form a second disc having a groove topography of opposite contour from that of said first disc, wherein said second disc is suitable to produce positive replicas of said signal modulated grooved disc.
1 more element
A method of forming an information storing medium comprising the steps of:
- forming upon a first disc substrate, a spiral-grooved surface having peak, valley and wall regions covered with a continuous coating of electron beam sensitive material;
- forming a topography in said spiral groove representative of information to be stored by exposing said spiral groove to an electron beam modulated according to said information such that said electron beam does not pierce completely through said continuous coating to said substrate to thereby avoid overexposure of said coating by electron beam reflection off said substrate;
- and
- developing said exposed groove to remove portions of said material in accordance with the pattern of exposure such that the wall and valley regions after developing includes a continuous residuum of said material therein.
1 more element
A method of forming an information storing medium comprising the steps of:
- forming upon a first disc substrate, a spiral-grooved surface having peak, valley and wall regions covered with a continuous coating of electron beam sensitive material;
- exposing said spiral groove to an electron beam modulated according to information to be stored such that said electron beam does not pierce completely through said continuous coating to said substrate to thereby avoid exposure of said coating by electron beam reflection off said substrate;
- and
- forming a topography in said spiral groove representative of said information by developing said exposed groove to remove portions of said material in accordance with the pattern of exposure, the thickness of said material in the wall and valley regions of said groove prior to said developing, the depth of electron beam penetration into said material during said exposing, and the degree of said developing being so related that the wall and valley regions after developing include a continuous residuum of said material therein.
1 more element
Dependencies are inferred from the claim text.