US4636806A
Expired / Lapsed
US
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Recording medium
Assignee: KENJI SUZUKI 11-12-12 SHOGEN IZUMI-SHI MIYAGI JAPAN
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Filing: 1985-03-29
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Granted: 1987-01-13
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Expires: 2005-03-29
Abstract
Abstract A recording medium is disclosed, which comprises as the main component an amorphous lead oxide or a lead oxide at the metastable state, having the formula of PbL x M y O z wherein L and M each indicate elements other than Pb and O. The recording mediums are drastically changed in their electrical properties and optical properties by application of heat, due to the characteristics inherent in the main component, and such changes make the recording medium highly useful for recording by laser light or heat.
Inventors
- 👤 Hisao Watarai
- 👤 Masahiro Tanaka
- 👤 Shuji Masuda
- 👤 Kenji Suzuki
- 👤 Tsuyoshi Masumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:23
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24306; G11B2007/24312; G11B2007/24318; G11B2007/2432; G11B7/004; G11B7/0045; G11B7/00454; G11C; G11C13/00; G11C13/04; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
A heat-sensitive and laser light-sensitive recording medium comprised of a reactively-sputtered coating upon a substrate, said coating consisting essentially of an amorphous or metastable lead oxide composition having the formula PbL.sub.x O.sub.z wherein L is at least one element selected from the group consisting of Fe, Co and Ni, O<x≦1.5 1≦z≦4.25 said lead oxide composition being convertible to a stable state and simultaneously the light transmittance and/or electrical resistance of said lead oxide composition are changed, by application of heat or laser light to said recording medium.
Claim 2
Dependent Claim
87 words
A heat-sensitive and laser light-sensitive recording medium comprised of a reactively-sputtered coating upon a substrate, said coating consisting essentially of an amorphous or metastable lead oxide composition having the formula PbL.sub.x O.sub.z wherein L is at least one element selected from the group consisting of Fe, Co and Ni, O<x≦1.5 1≦z≦4.25 said lead oxide composition being convertible to a stable state and simultaneously the light transmittance and/or electrical resistance of said lead oxide composition are changed, by application of heat or laser light to said recording medium.
Claim 3
Dependent Claim
11 words
A recording medium as claimed in claim 1, in which X≦1.0.
Claim 4
Dependent Claim
19 words
A recording medium as cliamed in claim 1, in which said lead oxide composition has the formula PbFe.sub.0.2 O.sub.2.3.
Claim 5
Dependent Claim
49 words
A method of recording information, comprising applying to the recording medium as claimed in claim 1, a heat and/or laser light pattern indicative of encoded information to convert said medium from its amorphous or metastable state to a stable state and thereby record the encoded information on the medium.
Claim 6
Dependent Claim
86 words
A heat-sensitive and laser light-sensitive recording medium comprised of a reactively-sputtered coating upon a substrate, said coating consisting essentially of an amorphous or metastable lead oxide composition having the formula PbM.sub.y O.sub.z wherein M is at least one element selected from the group consisting of Nb and Ta, O<y≦1.5, 1<z≦5.75 said least oxide composition being convertible to a stable state and simultaneously the light transmittance and/or electrical resistance of said lead oxide composition are changed, by application of heat or laser light to said recording medium.
Claim 7
Dependent Claim
86 words
A heat-sensitive and laser light-sensitive recording medium comprised of a reactively-sputtered coating upon a substrate, said coating consisting essentially of an amorphous or metastable lead oxide composition having the formula PbM.sub.y O.sub.z wherein M is at least one element selected from the group consisting of Nb and Ta, O<y≦1.5, 1<z≦5.75 said least oxide composition being convertible to a stable state and simultaneously the light transmittance and/or electrical resistance of said lead oxide composition are changed, by application of heat or laser light to said recording medium.
Claim 8
Dependent Claim
19 words
A recording medium as claimed in claim 5 in which said lead oxide composition has the formula PbNb.sub.0.5 O.sub.2.67.
Claim 9
Dependent Claim
49 words
A method of recording information, comprising applying to the recording medium as claimed in claim 5, a heat and/or laser light pattern indicative of encoded information to convert said medium from its amorphous or metastable state to a stable state and thereby record the encoded information on the medium.
Claim 10
Dependent Claim
104 words
A heat-sensitive and laser light-sensitive recording medium comprised of a reactively-sputtered coating upon a substrate, said coating consisting essentially of an amorphous or metastable lead oxide composition having the formula PbL.sub.x M.sub.y O.sub.z wherein L is at least one element selected from the group consisting of Fe, Co and Ni, M is at least one element selected from the group consisting of Nb and Ta, O<x+y≦2 and 1<z≦7, said lead oxide composition being convertible to a stable state and simultaneously the light transmittance and/or electrical resistance of said lead oxide composition are changed, by application of heat or laser light to said recording medium.
Claim 11
Dependent Claim
104 words
A heat-sensitive and laser light-sensitive recording medium comprised of a reactively-sputtered coating upon a substrate, said coating consisting essentially of an amorphous or metastable lead oxide composition having the formula PbL.sub.x M.sub.y O.sub.z wherein L is at least one element selected from the group consisting of Fe, Co and Ni, M is at least one element selected from the group consisting of Nb and Ta, O<x+y≦2 and 1<z≦7, said lead oxide composition being convertible to a stable state and simultaneously the light transmittance and/or electrical resistance of said lead oxide composition are changed, by application of heat or laser light to said recording medium.
Claim 12
Dependent Claim
13 words
A recording medium as claimed in claim 8 in which x≠o and y≠o.
Claim 13
Dependent Claim
20 words
A recording medium as claimed in claim 9 in which said lead oxide composition has the formula PbFe.sub.0.18 Nb.sub.0.22 O.sub.2.24.
Claim 14
Dependent Claim
20 words
A recording medium as claimed in claim 9 in which said lead oxide composition has the formula PbFe.sub.0.25 Nb.sub.0.15 O.sub.2.3.
Claim 15
Dependent Claim
20 words
A recording medium as claimed in claim 9 in which said lead oxide composition has the formula PbFe.sub.0.4 Nb.sub.0.31 O.sub.3.1.
Claim 16
Dependent Claim
49 words
A method of recording information, comprising applying to the recording medium as claimed in claim 1, a heat and/or laser light pattern indicative of encoded information to convert said medium from its amorphous or metastable state to a stable state and thereby record the encoded information on the medium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |