Claims
- 1. A high dielectric polymeric optical recording medium for recording information by heating portions of the recording medium corresponding to information to be recorded by being exposed to a beam of light, followed by the application of a reverse electric field to the recording medium, thereby selectively reversing the polarity of the heated portions in said recording medium, comprising
- a lower electrode,
- a recording layer formed on said lower electrode, which comprises a high dielectric polymeric composition comprising a high dielectric polymeric material having a rectangular dielectric hysteresis curve and a nonionic dye serving as a light-absorption agent which is compatible with or dispersible in said high dielectric polymeric material,
- an upper electrode formed on said recording layer, and
- an insulation layer interposed at least between said recording layer and said upper electrode or between said lower electrode and said recording layer.
- 2. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein said nonionic dye has an molar absorbance index (.epsilon.) of 10.sup.4 mol.sup.-1 .multidot.l.multidot.cm.sup.-1 or more near the wavelength of a beam of light applied thereto.
- 3. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein said nonionic dye is selected from the group consisting of a phthalocyanine dye, a naphthalocyanine dye, a benzene dithiol dye, a naphthoquinone dye, and an anthraquinone dye.
- 4. The high dielectric polymeric optical recording medium as claimed in claim 3, wherein said phthalocyanine dye has the following formula (I): ##STR10## wherein M represents tin, zinc, titanium, vanadium, and indium; and
- R represents an alkyl group having 1 to 22 carbon atoms, an alkoxyl group having 1 to 22 carbon atoms, halogen, an amino group, an amino group substituted with an alkyl or alkoxyl group having 1 to 10 carbon atoms.
- 5. The high dielectric polymeric optical recording medium as claimed in claim 3, wherein said naphthalocyanine dye has the following formula (III): ##STR11## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 are identical or different, and represent a linear or branched alkyl group having 1 to 22 carbon atoms or halogen;
- n is identical or different, and represents an integer of from 0 to 6; and
- X.sup.1 and X.sup.2 are identical or different, and represent a group selected from the group consisting of --R, --At, --OR, --OAr, --OSi(R).sub.3, --OSi(OR).sub.3 and --OSi(OAr).sub.3, in which R represents a linear or branched alkyl group having 1 to 22 carbon atoms, and Ar represents a group selected from the group consisting of a phenyl group, a substituted phenyl group, a benzyl group and a substituted benzyl group.
- 6. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein the amount of said nonionic dye is less than 5 wt. % of the amount of said high dielectric polymeric material.
- 7. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein said high dielectric polymeric material is selected from the group consisting of polyvinylidene fluoride, a copolymer of vinylidene fluoride and ethylene trifluoride, a copolymer of vinylidene fluoride and ethylene tetrafluoride, a copolymer of vinylidene fluoride and vinyl fluoride, a copolymer of vinylidene fluoride, ethylene tetrafluoride and propylene hexafluoride, polyvinylidene cyanide, and a copolymer of vinylidene cyanide and vinylacetate.
- 8. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein said lower electrode and said upper electrode are each made of a material selected from the group consisting of indium oxide, indium oxide doped with tin, tin oxide, zinc oxide, gold, platinum, silver, copper, lead, zinc, aluminum, nickel, tantalum, cobalt, niobium, palladium, and tin.
- 9. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein the thickness of said recording layer is in the range of from 0.3 to 5 .mu.m.
- 10. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein the thickness of said lower electrode is in the range of from 0.03 to 0.5 .mu.m.
- 11. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein the thickness of said upper electrode is in the range of from 0.03 to 0.5 .mu.m.
- 12. The high dielectric polymeric optical recording medium as claimed in claim 1, further comprising an undercoat layer interposed between said lower electrode and said recording layer.
- 13. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein said undercoat layer comprises a material selected from the group consisting of hexamethyl disilazane, trimethyl chlorosilane, dimethyl chlorosilane, dimethyl dichlorosilane, bis(trimethylsilyl)-acetoamide, t-butyldimethyl chlorosilane, bis(trimethylsilyl)trifluoroacetoamide, trimethylsilyl diphenyl urea, bistrimethylsilyl urea, and titanium coupling agents.
- 14. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein the thickness of said undercoat layer is in the range of from 0.01 to 0.9 .mu.m.
- 15. The high dielectric polymeric optical recording medium as claimed in claim 1, further comprising a protective layer formed on said upper electrode.
- 16. The high dielectric polymeric optical recording medium as claimed in claim 15, wherein said protective layer is made of a material selected from the group consisting of polymeric materials, silane coupling agents and glass.
- 17. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein said insulation layer comprises a material selected from the group consisting of a thermoplastic resin, a thermosetting resin, an ultraviolet ray-setting resin, an electron ray-setting resin, a metal oxide and a metal sulfide.
- 18. The high dielectric polymeric optical recording medium as claimed in claim 1, wherein the thickness of said insulation layer is in the range of from 0.05 to 0.8 .mu.m.
Priority Claims (3)
Number |
Date |
Country |
Kind |
63-145808 |
Jun 1988 |
JPX |
|
63-240826 |
Sep 1988 |
JPX |
|
63-273244 |
Oct 1988 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/366,447, filed on Jun. 15, 1989, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
63-046638 |
Feb 1988 |
JPX |
2142494 |
Jan 1985 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
366447 |
Jun 1989 |
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