US4500889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for recording light information
Assignee: Fujifilm Holdings Corp
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Filing: 1982-06-21
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Granted: 1985-02-19
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Expires: 2002-06-21
Abstract
Abstract In a method for recording information by irradiating an optical information recording material comprising a heat mode recording layer comprising a metal on a base with a light beam, the method for recording optical information in which said heat mode recording layer consists of a metal and at least one metal compound selected from metal oxides and metal sulfides and the proportion of the amount of the metal to that of said metal compound increases or decreases in the direction of the thickness of the layer, said recording layer having a layer comprising of mixture of at least one of the metal and at least one of the metal compound, in which irradiation with the light beam is conducted from the side where the proportion of the metal in the recording layer is smaller, and in which melting and removing are conducted until the difference in reflectance of the light between the non-recorded area and the recorded area reaches an extent which permits reading by light. The method permits highly sensitive recording by a light beam of a lower energy and can afford a record of information suitable for reflex reading.
Inventors
- 👤 Minoru Wada
- 👤 Yonosuke Takahashi
- 👤 Eiichi Hasegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:35
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G01; G01D; G01D15/00; G01D15/14; G01D15/34; G01D15/342; G11B2007/24302; G11B2007/24304; G11B2007/24306; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/24318; G11B2007/2432; G11B2007/24324; G11B7/2433; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
193 words
In a method for recording information by irradiating an optical information recording material comprising a heat mode recording layer comprising a metal on a base with a light beam, the method for recording optical information in which said heat mode recording layer consists of a metal and at least one metal compound selected from metal oxides and metal sulfides and the proportion of the amount of the metal to that of said metal compound changes in a manner that the proportion either increases or decreases in the direction of the thickness of the layer, said recording layer having a layer comprising a mixture of at least one of the metals and at least one of the metal compounds in which irradiation with the light beam is conducted from the side where the proportion of the metal in the recording layer is smaller, and in which melting and removing are conducted to expose an area where the proportion of the metal is greater in the recording layer until the difference in reflection of the light between the non-irradiated area and the irradiated area reaches an extent which is sufficient to permits reading by light.
Claim 2
Dependent Claim
193 words
In a method for recording information by irradiating an optical information recording material comprising a heat mode recording layer comprising a metal on a base with a light beam, the method for recording optical information in which said heat mode recording layer consists of a metal and at least one metal compound selected from metal oxides and metal sulfides and the proportion of the amount of the metal to that of said metal compound changes in a manner that the proportion either increases or decreases in the direction of the thickness of the layer, said recording layer having a layer comprising a mixture of at least one of the metals and at least one of the metal compounds in which irradiation with the light beam is conducted from the side where the proportion of the metal in the recording layer is smaller, and in which melting and removing are conducted to expose an area where the proportion of the metal is greater in the recording layer until the difference in reflection of the light between the non-irradiated area and the irradiated area reaches an extent which is sufficient to permits reading by light.
Claim 3
Dependent Claim
41 words
A method for recording information by irradiating an optical information recording material, as claimed in claim 1, wherein the proportional amount of the metal to the metal compound increases in the direction of the thickness of the layer towards the base.
Claim 4
Dependent Claim
43 words
A method for recording information by irradiating an optical information recording material, as claimed in claim 1, wherein the proportional amount of the metal to the metal compound decreases in the direction of thickness of the layer in the direction towards the base.
Claim 5
Dependent Claim
35 words
A method of recording information by irradiating an optical information recording material, as claimed in claim 1, wherein the proportional amount of the metal to the metal compound changes continuously in the direction of thickness.
Claim 6
Dependent Claim
42 words
A method for recording information by irradiating an optical information recording material, as claimed in claim 1, wherein the proportional amount of the metal to the metal compound changes discontinuously so as to form a plurality of different layers of different composition.
Claim 7
Dependent Claim
45 words
A method for recording information by irradiating an optical information recording material, as claimed in claim 1, wherein the proportional amount of the metal to the metal compound continuously changes for a part of the thickness and discontinuously changes for the rest of the thickness.
Claim 8
Dependent Claim
61 words
The method for recording light information according to claim 1 wherein the metal is selected from Mg, Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Si, Ge, Te, Pb, Po, Sn, As, Sb, Bi, Se and mixtures and alloys thereof.
Claim 9
Dependent Claim
90 words
The method for recording optical information according to claim 1 wherein the metal sulfide is selected from CrS, Cr 2 S, Cr 2 S 3 , MoS 2 , MnS, FeS, FeS 2 , CoS, Co 2 S 3 , NiS, Ni 2 S 3 , PdS, Cu 2 S, Ag 2 S, ZnS, In 2 S 3 , In 2 S 2 , GeS x (1≦×≦2), SnS, SnS 2 , PbS, As 2 S 3 , Sb 2 S 3 , Bi 2 S 3 and a mixture thereof.
Claim 10
Dependent Claim
52 words
The method for recording optical information according to claim 1 wherein the metal oxide is selected from MoO 2 , InO, In 2 O, In 2 O 3 , GeO, PbO, WO 3 , TiO 2 , SiO, SiO 2 , ZrO 2 , Al 2 O 3 and a mixture thereof.
Claim 11
Dependent Claim
40 words
The method for recording optical information according to claim 1 wherein the proportion of the metal compound on the surface of the recording layer on the side to be irradiated with a light beam is at least 30 vol %.
Claim 12
Dependent Claim
40 words
The method for recording optical information according to claim 1 wherein the proportion of the metal on the surface of the recording layer opposite to the side to be irradiated with a light beam is at least 70 vol %.
Claim 13
Dependent Claim
29 words
The method for recording light information according to claim 1 wherein the recording layer comprises a part having a composition exhibiting a reflectance to light of at least 50%.
Claim 14
Dependent Claim
28 words
The method for recording optical information according to claim 12 wherein irradiation is continued until the composition exhibiting a reflectance to light of at least 50% is exposed.
Claim 15
Dependent Claim
33 words
The method for recording optical information according to claim 1 wherein the difference in reflectance to light between the non-irradiated area and the irradiated area of the recording layer is at least 20%.
Claim 16
Dependent Claim
38 words
The method for recording optical information according to claim 1 wherein the metal compound is the sole component in the section of the recording layer which covers the thickness of 0-500 A from the surface to be irradiated.
Claim 17
Dependent Claim
21 words
The method for recording optical information according to claim 1 wherein the film thickness of the recording layer is 300-2,000 A.
Claim 18
Dependent Claim
37 words
The method for recording optical information according to claim 1 wherein the surface of the recording layer where the proportion of the metal compound is greater is in contact with the support and the support is transparent.
Claim 19
Dependent Claim
37 words
The method for recording optical information according to claim 1 wherein the surface of the recording layer where the proportion of the metal compound is smaller is in contact with a support and the support is transparent.
Claim 20
Dependent Claim
45 words
A method for recording information by irradiating an optical information recording material, as claimed in claim 1, wherein the surface of the recording layer where the proportion of the metal compound is smaller is in contact with the support and wherein the support is opaque.
Claim 21
Dependent Claim
20 words
The method for recording optical information according to claim 1 wherein a protective layer is provided on the recording layer.
Claim 22
Dependent Claim
41 words
The method for recording optical information according to claim 1 wherein the metal is the sole component in the section of the recording layer which covers the thickness of 0-900 A from the surface opposite to the side to be irradiated.
Claim 23
Dependent Claim
71 words
The method for recording optical information according to claim 1 wherein the proportion of the metal compound on the surface of the recording layer on the side to be irradiated with a light beam is at least 30 vol. % and wherein the proportion of the metal on the surface of the recording layer opposite to the side to be irradiated with a light beam is at least 70 vol. %.
Claim 24
Dependent Claim
71 words
The method for recording optical information according to claim 22 wherein the recording layer comprises a part having a composition exhibiting a reflectance to light of at least 50%, wherein irradiation is continued until the composition exhibiting a reflectance to light of at least 50% is exposed and wherein the difference in reflectance to light between the non-irradiated area and the irradiated area of the recording layer is at least 20%.
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) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |