Patent US5175079A successfully refreshed from Google Patents.
US5175079A
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Optical memory device
Assignee: Sharp Corp
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Filing: 1991-08-26
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Granted: 1992-12-29
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Expires: 2011-08-26
Abstract
Abstract An optical memory device comprising: a transparent substrate; and a recording film deposited on the transparent substrate, the recording film being formed by preparing a composition in which a diarylethene-type photochromic compound is dispersed in an ultraviolet-curing polyurethaneacrylate resin of solventless type and by curing the composition by an ultraviolet ray irradiation.
Inventors
- 👤 Kazuo Van
- 👤 Kenji Ohta
- 👤 Yoshiteru Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:20
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/245; C; C08; C08F; C08F299/00; C08F299/02; C08F299/06; C09; C09D; C09D175/00; C09D175/04; C09D175/14; C09D175/16; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/163; Y10S430/165
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
An optical memory device comprising: a transparent substrate; and a recording film, deposited on the transparent substrate, the recording film consisting essentially of an ultraviolet cured dispersion of a diarylethene photochromic compound in an ultraviolet curable polyurethaneacrylate resin, wherein the diarylethene photochromic compound is a compound represented by the following formula (I) or (II): ##STR3## wherein each of X and Y represents a sulfur atom or --NR 6 and R 6 is a lower alkyl; R 1 represents a lower alkyl; each of R 2 , R 3 , R 4 and R 5 can be a lower alkyl or a combination of R 2 with R 3 or a combination of R 4 with R 5 can be phenyl.
Claim 2
Dependent Claim
120 words
An optical memory device comprising: a transparent substrate; and a recording film, deposited on the transparent substrate, the recording film consisting essentially of an ultraviolet cured dispersion of a diarylethene photochromic compound in an ultraviolet curable polyurethaneacrylate resin, wherein the diarylethene photochromic compound is a compound represented by the following formula (I) or (II): ##STR3## wherein each of X and Y represents a sulfur atom or --NR 6 and R 6 is a lower alkyl; R 1 represents a lower alkyl; each of R 2 , R 3 , R 4 and R 5 can be a lower alkyl or a combination of R 2 with R 3 or a combination of R 4 with R 5 can be phenyl.
Claim 3
Dependent Claim
91 words
The optical memory device according to claim 1 wherein the diarylethene photochromic compound is a compound represented by the following formula (I) ##STR4## wherein each of X and Y represents a sulfur atom or --NR 6 and R 6 is a lower alkyl; R 1 represents a lower alkyl; each of R 2 , R 3 , R 4 and R 5 can represent a lower alkyl or a combination of R 2 with R 3 can represent phenyl or a combination of R 4 with R 5 can represent phenyl.
Claim 4
Dependent Claim
26 words
The optical memory device according to claim 1, wherein the content of the diarylethene-type photochromic compound in the recording film is 5 to 50 wt. %.
Claim 5
Dependent Claim
20 words
The optical memory device according to claim 1, wherein the thickness of the recording film is 1 to 20 μm.
Claim 6
Dependent Claim
18 words
The optical memory device according to claim 1, wherein the transparent substrate is made of glass or polycarbonate.
Claim 7
Dependent Claim
20 words
The optical memory device according to claim 1, wherein a film for reflecting light is formed on the recording film.
Claim 8
Dependent Claim
22 words
The optical memory device according to claim 1, wherein the diarylethene type photochromic compound is 1,2-di(2,3,5-trimethylthienyl)-1,2-dicyanoethene represented by the following formula: ##STR5##
Claim 9
Dependent Claim
20 words
An optical memory device according to claim 1 wherein the transparent substrate contains groove guides for receiving the recording film.
Claim 10
Dependent Claim
20 words
An optical memory device according to claim 8 wherein the transparent substrate has the recording film deposited on one side.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |