Claims
- 1. An optical memory disk for laser recording and storage of optical information comprising,
- a self-supporting, planar disk backing,
- a vacuum or vapor deposited reflective metallic layer over said disk backing,
- a planar optical storage layer disposed over said metallic layer, said optical storage layer having a planar crust of irregular oblong black silver particles within the top one-half micron of the storage layer distal to the backing and substantially clear gelatin below the crust.
- 2. The optical memory disk of claim 1 further comprising a film substrate layer disposed over said disk backing in intimate contact therewith in planar relation, said metallic layer deposited on said film substrate layer.
- 3. The optical memory disk of claim 1 wherein said metallic layer is selected from the group consisting of gold, silver, aluminum, platinum, rhodium, copper and alloys thereof.
- 4. The optical memory disk of claim 1 wherein a transparent, protective, planar layer is disposed over said optical storage layer.
- 5. The optical memory disk of claim 1 wherein said optical storage layer contains prerecorded control information.
- 6. The optical memory disk of claim 1 wherein said optical storage layer contains laser written data.
- 7. A double-sided optical memory disk comprising,
- a self-supporting, optically transparent planar disk backing,
- a first planar optical storage layer disposed over said disk backing, said optical storage layer having a crust of irregular oblong black silver particles within one-half micron of the storage layer proximal to the backing and substantially clear gelatin above the crust,
- a first vapor or vacuum deposited reflective metallic layer disposed on said gelatin,
- a first planar support layer disposed over said metallic layer, said support layer having opposed planar surfaces, including a lower surface proximate said disk backing and an upper surface distal to said disk backing,
- a second planar support layer, substantially identical to said first planar support layer and adhered to the upper surface thereof,
- a second vapor or vacuum deposited reflective metallic layer disposed over said second planar support layer,
- a second planar optical storage layer disposed over said second metallic layer, said optical storage layer having a planar crust of irregular oblong black silver particles within the top one-half micron of the storage layer distal to the backing and substantially clear gelatin below the crust, and
- a transparent, protective, planar layer disposed over said second optical storage layer.
- 8. The double-sided disk of claim 7 wherein said optical storage layers contain prerecorded control information, each of said optical storage layers having been previously exposed at actinic wavelength and developed and fixed to produce a substantially dark, very thin, black silver crust, but having an imagewise exposure pattern of clear marks revealing the underlying high reflectivity metallic layer for light at the reading wavelength.
- 9. The double-sided disk of claim 7 wherein said optical storage layers contain laser written data.
- 10. The double-sided disk of claim 7 wherein said metallic layer material is selected from the group consisting of gold, silver, aluminum, platinum, rhodium, copper and alloys thereof.
- 11. A method for making an optical memory disk comprising,
- depositing a vacuum or vapor reflective metallic layer over a self-supporting, planar disk backing,
- disposing a planar photosensitive emulsion layer over said metallic layer,
- exposing said emulsion layer with actinic radiation,
- developing and fixing only a planar crust of said emulsion to be a substantially dark thin layer of irregular silver particles with a substantially clear gelatin layer beneath said crust, and
- disposing a transparent, planar protective layer over said planar crust.
- 12. The method of claim 11 further defined by
- making an imagewise exposure of marks representing control indicia or data, said exposure made in said photosensitive emulsion layer with actinic radiation, and
- developing and fixing said exposure pattern of image marks being substantially clear revealing an underlying reflectivity in the metallic layer when illuminated by light.
- 13. The method of claim 11 wherein said photosensitive emulsion layer is composed of a silver chloride emulsion.
- 14. The method of claim 11 wherein said photosensitive emulsion layer is composed of a silver bromide emulsion and developing said emulsion is performed with a chemical developer containing an organic antifoggant.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 935,999, filed Nov. 28, 1986, which is a continuation-in-part of application Ser. No. 896,988, filed Aug. 15, 1986, abandoned and a continuation-in-part of application Ser. No. 855,228, filed Apr. 23, 1986.
US Referenced Citations (10)
Related Publications (1)
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Date |
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855228 |
Apr 1986 |
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Continuation in Parts (2)
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Number |
Date |
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935999 |
Nov 1986 |
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Parent |
896988 |
Aug 1986 |
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