Patent US1963227A successfully refreshed from Google Patents.
Patent US5115424A successfully refreshed from Google Patents.
US5115424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical storage medium with provision for limitation of thermal conduction
Assignee: Mitsubishi Electric Corp
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Filing: 1989-01-23
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Granted: 1992-05-19
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Expires: 2009-01-23
Abstract
Abstract An optical type information record carrier is disclosed which includes an arrangement wherein the depth of the guide grooves is selected to be about (2N+1)λ/8n (N=1, 2, 3, . . . ) and the inclination angle of the wall surface of the carrier is steep enough to ensure that the information recording medium will not adhere to the wall surface of the guide grooves, or will only adhere very weakly if it does adhere. Thermal conduction at the wall surface of the guide grooves is prevented so that extension of the recording bits is restricted.
Inventors
- 👤 Hajime Nakajima
- 👤 Isao Watanabe
- 👤 Kunimaro Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:00
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24076; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10584; G11B7/24079; G11B7/24085; G11B11/1055; G11B11/10576; G11B11/10578
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
An information storage medium responsive to light of wavelength λ, comprising: a base member including a transparent material having an index of refraction n; said base member having at least one guide groove formed thereon; said base member having at least one land located adjacent said guide groove; said at least one guide groove having side walls; said at least one guide groove having a geometrical depth of about ##EQU12## where N is any positive integer; and a recording material for storing information and disposed on said at least one land and said at least one guide groove but not on at least a portion of said guide groove side walls so as to inhibit thermal conduction via said side walls when said medium is irradiated with the light wherein each of said side walls has an inclination angle θ that is less than 45°.
Claim 2
Dependent Claim
145 words
An information storage medium responsive to light of wavelength λ, comprising: a base member including a transparent material having an index of refraction n; said base member having at least one guide groove formed thereon; said base member having at least one land located adjacent said guide groove; said at least one guide groove having side walls; said at least one guide groove having a geometrical depth of about ##EQU12## where N is any positive integer; and a recording material for storing information and disposed on said at least one land and said at least one guide groove but not on at least a portion of said guide groove side walls so as to inhibit thermal conduction via said side walls when said medium is irradiated with the light wherein each of said side walls has an inclination angle θ that is less than 45°.
Claim 3
Dependent Claim
33 words
An information storage medium as claimed in claim 1, wherein said inclination angle is sufficiently steep so that expansion of any information recording bits in said at least one guide groove is stopped.
Claim 4
Dependent Claim
28 words
An information storage medium as claimed in claim 1, wherein said recording material is disposed on a side of said base member to be irradiated by the light.
Claim 5
Dependent Claim
168 words
An information storage medium responsive to light of wavelength λ, comprising: a base member including a transparent material having an index of refraction n; said base member having at least one guide groove formed thereon; said base member having at least one land located adjacent said guide groove; said at least one guide groove having side walls; said at least one guide groove having a geometrical depth of about ##EQU13## where N is any positive integer; and a recording material for storing information and disposed on said at least one land and said at least one guide groove, said recording material adheres to said side walls when said recording material is disposed on said land and said groove, wherein the thickness of said recording material where adhering to said side walls is made thin enough to inhibit thermal conduction via said side walls when said medium is irradiated with the light, and wherein each of said side walls has an inclination angle θ that is less than 45°.
Claim 6
Dependent Claim
168 words
An information storage medium responsive to light of wavelength λ, comprising: a base member including a transparent material having an index of refraction n; said base member having at least one guide groove formed thereon; said base member having at least one land located adjacent said guide groove; said at least one guide groove having side walls; said at least one guide groove having a geometrical depth of about ##EQU13## where N is any positive integer; and a recording material for storing information and disposed on said at least one land and said at least one guide groove, said recording material adheres to said side walls when said recording material is disposed on said land and said groove, wherein the thickness of said recording material where adhering to said side walls is made thin enough to inhibit thermal conduction via said side walls when said medium is irradiated with the light, and wherein each of said side walls has an inclination angle θ that is less than 45°.
Claim 7
Dependent Claim
33 words
An information storage medium as claimed in claim 4, wherein said inclination angle is sufficiently steep so that expansion of any information recording bits in said at least one guide groove is stopped.
Claim 8
Dependent Claim
28 words
An information storage medium as claimed in claim 4, wherein said recording material is disposed on a side of said base member to be irradiated by the light.
References Cited (Backward Citations)
US4230915A
Cited
JPS5555449A
Cited
US4930116A
Cited
US4547875A
Cited
US4586173A
Cited
JPS6079544A
Cited
JPS60133554A
Cited
SU1190405A1
Cited
US4734904A
Cited
US4731755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-19 | 1995-11-18 | 1996-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-19 | 1999-11-18 | 2000-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-19 | 2003-11-18 | 2004-05-19 | $7700.00 | Window Closed / Lapsed |