Radiation imagery chemistry: process – composition – or product th – Color imaging process – Chromatic image produced from achromatic reproduction image
Reexamination Certificate
1998-02-24
2001-07-24
Angebranndt, Martin (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Color imaging process
Chromatic image produced from achromatic reproduction image
C430S371000, C430S945000, C430S363000, C430S270110, C430S139000
Reexamination Certificate
active
06265140
ABSTRACT:
FIELD OF THE INVENTION
The present invention is directed to the field of materials for optical recording, storing and reading of information, including systems for 3-D optical memory based on luminescent compounds which can be used with CD-ROM systems.
The next generation of computer memories will be connected with memory systems using super dense optical memory materials to take advantage of these materials memory storage density and access speed. The optical disks of CD-ROM's are examples of optical memory systems.
The disadvantages of current CD-ROM's are an insufficient density of memory, insufficient amount of memory and unfavorable ratio of signal-to-noise for the next generation of computers.
Presently, some new materials, including the materials of the invention with luminescent properties for the reading of information, have been suggested for the improved optical memory systems that are under development. Such materials have an increased recording density, a high signal-to-noise ratio, and increased stability during storage and utilization.
BACKGROUND OF THE INVENTION
There are different prior art systems for optical recording based on the forming of fluorescent compounds from non-fluorescent precursors, including the UV-light exposed compounds of bis-diarylchloromethyl-1,3,4-oxadiazoles which are disclosed in U.S. Pat. No. 3,869,363. Moreover, many other systems are described in Zweig “Photochemical Generation of Stable Fluorescent Compounds” in Pure and Applied Chemistry, Vol. 33, 389-410 (1973) herein incorporated by reference. The main disadvantage of systems using these compounds is the requirement to use lasers with wavelengths shorter than 500 nm for the reading of stored information in the system. Thus, these systems exclude the possible use of modern diode lasers with wavelengths over 600 nm for reading the information in the storage device.
Photochromic lactams of Rhodamine B and peri-phenoxy derivatives of polycyclic p-quinones are suggested for use in these memory devices in which the luminophores are photochemically generated (U.S. Provisional Patent Application No. 60/03,258 filed on Dec. 10, 1996 and U.S. Provisional Patent Application No. 60/033,709 filed on Dec. 20, 1996, serial numbers not yet assigned, herein incorporated by reference). These compounds can be used in optical memory devices employing modern diode lasers with the wavelengths over 600 nm for reading the stored information. However, photochromic systems based on the generation of luminescent products have the common disadvantage of the destruction of the photoinduced luminescent product during the reading process. Moreover, these systems have low light sensitivities which then requires high energy densities of irradiation during the recording process which can lead to destruction of the memory material.
SUMMARY OF THE INVENTION
This invention provides for a super dense optical memory material for information storage and use with computers. The invention includes the formation of silver halide crystals of a defined size and the optional treatment of these silver halide crystals with sensitizers and/or spectral sensitizers. The silver halide crystals of the invention are then exposed to light, developed and fixed. The silver grains can then be treated with luminescent dyes to form the luminescent particles of the invention. Alternatively, the silver particles or the surface of the silver particles can be oxidized and luminescent dyes sorbed onto the oxidized surface or the oxidized particles can be treated to form insoluble salts which are then treated with luminescent dyes to form the luminescent particles of the invention. In addition, polyvalent cations can be sorbed onto the surface of the silver particles, the oxidized silver particles, the silver salts or the insoluble salts to form luminescent metal complex compounds. In addition, mercapto- or benzotriazoyl compounds can be used to promote the adsorption of the luminescent dyes onto the silver or other insoluble particles.
The optical memory material of the invention can be formed either into a single layer of polymer with silver halide crystals or a three dimensional memory material can be formed by stacking layers of silver halide material dispersed in a polymer with layers of silver halide free material. Alternatively, relatively thick layers of silver halide material can be used to form a three dimensional material.
The invention includes a two laser system for the two photon writing of information within a three dimensional optical matrix.
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Zweig, A., “Photochemical Generation of Stable Fluorescent Compounds (Photofluorescence),” Pure and Applied Chemistry, vol. 33, pp. 389-410 (1973).
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Alperovich Mark A.
Levich Eugene B.
Malkin Jacob N.
Shapiro Boris M.
Angebranndt Martin
Blank Rome Comisky & McCauley LLP
TriDStore IP LLC
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