Patent US5255262A successfully refreshed from Google Patents.
US5255262A
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Multiple data surface optical data storage system with transmissive data surfaces
Assignee: Mitsubishi Electric Corp
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Filing: 1991-06-04
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Granted: 1993-10-19
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Expires: 2011-06-04
Abstract
Abstract An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are located on the substrate surfaces which lie adjacent a light transmissive medium. The data surfaces are substantially light transmissive. The optical head includes an aberration compensator to allow the head to focus onto the different data surfaces and a filter to screen out unwanted reflected light.
Inventors
- 👤 Margaret E. Best
- 👤 Hal J. Rosen
- 👤 Kurt A. Rubin
- 👤 Timothy C. Strand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:14
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1381; G11B7/007; G11B7/00745; G11B11/00; G11B11/10; G11B11/105; G11B11/1055; G11B11/10576; G11B11/10578; G11B11/10582; G11B11/10584; G11B19/00; G11B19/02; G11B19/12; G11B7/004; G11B7/005; G11B7/0053; G11B7/0055; G11B7/00557; G11B7/013; G11B7/08; G11B7/085; G11B7/08505; G11B7/08511; G11B7/08517; G11B7/09; G11B7/0901; G11B7/0908; G11B7/0938; G11B7/1353; G11B7/1365; G11B7/1372; G11B7/1376; G11B7/1392; G11B7/13925; G11B7/14; G11B7/24; G11B7/2403; G11B7/24035; G11B7/24038; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/252; G11B7/253; G11B7/257; G11B7/2578; G11B11/10595; G11B2007/0003; G11B2007/0009; G11B2007/0013; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/25705; G11B2007/25706; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B2007/25716; G11B2007/25718; G11B7/002; G11B7/0037; G11B7/00718; G11B7/00736; G11B7/0945; G11B7/2531; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
178 words
An optical data storage medium comprising: a first radiation transmissive member comprising a substrate having a first transmissive data surface for storing recorded data, the substrate having an index of refraction of n1, the first data surface having a land portion and having marks at elevation d1, where d1 is the perpendicular distance between the marks and the land portion; a second member having a second data surface for storing recorded data, the second data surface having a land portion and having marks at elevation d2, where d2 is the perpendicular distance between the marks and the land portion; means for supporting the first and second data surfaces in spaced apart relationship; and a radiation transmissive medium positioned between the first and second data surfaces such that a beam of radiation from a first side of the optical data storage medium passes through the substrate of the first radiation transmissive member and focuses on either the first or second data surfaces, the radiation transmissive medium having an index of refraction of n2, and wherein d1n1 substantially equals d2n2.
Claim 2
Dependent Claim
178 words
An optical data storage medium comprising: a first radiation transmissive member comprising a substrate having a first transmissive data surface for storing recorded data, the substrate having an index of refraction of n1, the first data surface having a land portion and having marks at elevation d1, where d1 is the perpendicular distance between the marks and the land portion; a second member having a second data surface for storing recorded data, the second data surface having a land portion and having marks at elevation d2, where d2 is the perpendicular distance between the marks and the land portion; means for supporting the first and second data surfaces in spaced apart relationship; and a radiation transmissive medium positioned between the first and second data surfaces such that a beam of radiation from a first side of the optical data storage medium passes through the substrate of the first radiation transmissive member and focuses on either the first or second data surfaces, the radiation transmissive medium having an index of refraction of n2, and wherein d1n1 substantially equals d2n2.
Claim 3
Dependent Claim
15 words
The optical data storage medium of claim 1, wherein the radiation transmissive medium is air.
Claim 4
Dependent Claim
18 words
The optical data storage medium of claim 1, wherein the radiation transmissive medium is a solid transparent material.
Claim 5
Dependent Claim
13 words
The optical data storage medium of claim 1, wherein the marks are grooves.
Claim 6
Dependent Claim
14 words
The optical data storage medium of claim 1, wherein the marks are inverse grooves.
Claim 7
Dependent Claim
29 words
The optical data storage medium of claim 1, wherein the marks on the first data surface are grooves and the marks on the second data surface are inverse grooves.
Claim 8
Dependent Claim
29 words
The optical data storage medium of claim 1, wherein the marks on the first data surface are inverse grooves and the marks on the second data surface are grooves.
Claim 9
Dependent Claim
13 words
The optical data storage medium of claim 1, wherein the marks are pits.
Claim 10
Dependent Claim
14 words
The optical data storage medium of claim 1, wherein the marks are inverse pits.
Claim 11
Dependent Claim
29 words
The optical data storage medium of claim 1, wherein the marks on the first data surface are pits and the marks on the second data surface are inverse pits.
Claim 12
Dependent Claim
29 words
The optical data storage medium of claim 1, wherein the marks on the first data surface are inverse pits and the marks on the second data surface are pits.
Claim 13
Dependent Claim
18 words
The optical data storage medium of claim 1, wherein the first data surface is an uncoated ROM surface.
Claim 14
Dependent Claim
15 words
The optical data storage medium of claim 12, wherein n1 is not equal to n2.
Claim 15
Dependent Claim
17 words
The optical data storage medium of claim 12, wherein the second data surface is a ROM surface.
Claim 16
Dependent Claim
18 words
The optical data storage medium of claim 12, wherein the second data surface has a WORM material coating.
Claim 17
Dependent Claim
19 words
The optical data storage medium of claim 12, wherein the second data surface has a phase change material coating.
Claim 18
Dependent Claim
18 words
The optical data storage medium of claim 12, wherein the second data surface has a magneto-optic material coating.
Claim 19
Dependent Claim
18 words
The optical data storage medium of claim 1, wherein the first data surface has a WORM material coating.
Claim 20
Dependent Claim
17 words
The optical data storage medium of claim 18, wherein the second data surface is a ROM surface.
Claim 21
Dependent Claim
18 words
The optical data storage medium of claim 18, wherein the second data surface has a WORM material coating.
Claim 22
Dependent Claim
19 words
The optical data storage medium of claim 18, wherein the second data surface has a phase change material coating.
Claim 23
Dependent Claim
18 words
The optical data storage medium of claim 18, wherein the second data surface has a magneto-optic material coating.
Claim 24
Dependent Claim
19 words
The optical data storage medium of claim 1, wherein the first data surface has a phase change material coating.
Claim 25
Dependent Claim
17 words
The optical data storage medium of claim 23, wherein the second data surface is a ROM surface.
Claim 26
Dependent Claim
18 words
The optical data storage medium of claim 23, wherein the second data surface has a WORM material coating.
Claim 27
Dependent Claim
19 words
The optical data storage medium of claim 23, wherein the second data surface has a phase change material coating.
Claim 28
Dependent Claim
18 words
The optical data storage medium of claim 23, wherein the second data surface has a magneto-optic material coating.
Claim 29
Dependent Claim
17 words
The optical data storage medium of claim 1, wherein the first data surface has a magneto-optic coating.
Claim 30
Dependent Claim
17 words
The optical data storage medium of claim 28, wherein the second data surface is a ROM surface.
Claim 31
Dependent Claim
18 words
The optical data storage medium of claim 28, wherein the second data surface has a WORM material coating.
Claim 32
Dependent Claim
19 words
The optical data storage medium of claim 28, wherein the second data surface has a phase change material coating.
Claim 33
Dependent Claim
18 words
The optical data storage medium of claim 28, wherein the second data surface has a magneto-optic material coating.
Claim 34
Dependent Claim
34 words
The optical data storage medium of claim 1, wherein the first data surface has a dielectric coating having an index of refraction greater than the index of refraction of the first radiation transmissive member.
Claim 35
Dependent Claim
34 words
The optical data storage medium of claim 1, wherein the first data surface has a dielectric coating having an index of refraction less than the index of refraction of the first radiation transmissive member.
Claim 36
Dependent Claim
14 words
The optical data storage medium of claim 1, wherein the marks are tracking marks.
Claim 37
Dependent Claim
14 words
The optical data storage medium of claim 1, wherein the marks are data marks.
Claim 38
Dependent Claim
229 words
An optical data storage system comprising: a radiation source; an optical medium comprising a first radiation transmissive member comprising a substrate having a first transmissive data surface for storing recorded data, the substrate having an index of refraction of n1, the first data surface having a land portion and having marks at elevation d1, where d1 is the perpendicular distance between the marks and the land portion; a second member having a second data surface for storing recorded data, the second data surface having a land portion and having marks at elevation d2, where d2 is the perpendicular distance between the marks and the land portion; means for supporting the first and second data surfaces in spaced apart relationship; a radiation transmissive medium positioned between the first and second data surfaces such that a beam of radiation from a first side of the optical data storage medium passes through the substrate of the first radiation transmissive member and focuses on either the first or second data surfaces, the radiation transmissive medium having an index of refraction of n2, and wherein d1n1 substantially equals d2n2; an optical transmission means for directing a radiation beam from the radiation source to one of the data surfaces of the optical medium; and an optical reception means for receiving a reflected radiation beam from the optical medium and providing a data signal responsive thereto.
Claim 39
Dependent Claim
229 words
An optical data storage system comprising: a radiation source; an optical medium comprising a first radiation transmissive member comprising a substrate having a first transmissive data surface for storing recorded data, the substrate having an index of refraction of n1, the first data surface having a land portion and having marks at elevation d1, where d1 is the perpendicular distance between the marks and the land portion; a second member having a second data surface for storing recorded data, the second data surface having a land portion and having marks at elevation d2, where d2 is the perpendicular distance between the marks and the land portion; means for supporting the first and second data surfaces in spaced apart relationship; a radiation transmissive medium positioned between the first and second data surfaces such that a beam of radiation from a first side of the optical data storage medium passes through the substrate of the first radiation transmissive member and focuses on either the first or second data surfaces, the radiation transmissive medium having an index of refraction of n2, and wherein d1n1 substantially equals d2n2; an optical transmission means for directing a radiation beam from the radiation source to one of the data surfaces of the optical medium; and an optical reception means for receiving a reflected radiation beam from the optical medium and providing a data signal responsive thereto.
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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) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |