Patent US5202875A successfully refreshed from Google Patents.
US5202875A
Expired / Lapsed
US
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Multiple data surface optical data storage system
Assignee: Mitsubishi Electric Corp
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Filing: 1991-06-04
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Granted: 1993-04-13
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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
- 👤 Hal J. Rosen
- 👤 Kurt A. Rubin
- 👤 Glenn T. Sincerbox
- 👤 Timothy C. Strand
- 👤 James M. Zavislan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:59
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/135; G11B7/1381; G11B7/24; G11B7/2403; G11B7/24035; G11B7/24038; G02; G02B; G02B27/00; G02B27/0025; G02B5/00; G11B7/004; G11B7/08; G11B7/09; G11B7/0908; G11B7/1359; G11B7/1365; G11B7/1369; G11B7/1372; G11B7/1378; G11B7/1392; G11B7/13925; G11B2007/0003; G11B2007/0009; G11B2007/0013
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
110 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the lens and medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered due to the different depths of data surfaces, the aberration compensator comprising a pair of complementary transparent triangular blocks which may be moved relative to one another; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 2
Dependent Claim
110 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the lens and medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered due to the different depths of data surfaces, the aberration compensator comprising a pair of complementary transparent triangular blocks which may be moved relative to one another; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 3
Dependent Claim
105 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing a laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a beamsplitter, a quarter waveplate, and a piezo-electric surface mirror; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 4
Dependent Claim
105 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing a laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a beamsplitter, a quarter waveplate, and a piezo-electric surface mirror; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 5
Dependent Claim
103 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising an aspheric lens having a spherical aberration surface; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 6
Dependent Claim
103 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising an aspheric lens having a spherical aberration surface; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 7
Dependent Claim
119 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a convex and concave lens which are moveable relative to one another, the concave lens located between the convex lens the lens for focussing; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 8
Dependent Claim
119 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a convex and concave lens which are moveable relative to one another, the concave lens located between the convex lens the lens for focussing; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 9
Dependent Claim
110 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a rotatable hologram having a plurality of spherical aberration compensation recordings which are angularly separated; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 10
Dependent Claim
110 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a rotatable hologram having a plurality of spherical aberration compensation recordings which are angularly separated; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 11
Dependent Claim
137 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a beamsplitter, a quarter waveplate located on one side of the beamsplitter, and a plurality of mirrors with spherical aberration correction surfaces, the plurality of mirrors attached to a movement means for selectively positioning one of the mirrors proximate the quarter waveplate; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 12
Dependent Claim
137 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a beamsplitter, a quarter waveplate located on one side of the beamsplitter, and a plurality of mirrors with spherical aberration correction surfaces, the plurality of mirrors attached to a movement means for selectively positioning one of the mirrors proximate the quarter waveplate; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 13
Dependent Claim
93 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a focus lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the focus lens for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encounter at the different depths of data surfaces; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 14
Dependent Claim
93 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having a plurality of data surfaces; a focus lens for focussing the laser beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the focus lens for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encounter at the different depths of data surfaces; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 15
Dependent Claim
26 words
The system of claim 7, wherein the adjustable aberration compensator comprises a rotatable hologram having a plurality of spherical aberration compensation recordings which are angularly separated.
Claim 16
Dependent Claim
53 words
The system of claim 7, wherein the adjustable aberration compensator comprises a beamsplitter, a quarter waveplate located on one side of the beamsplitter, and a plurality of mirrors with spherical aberration correction surfaces, the plurality of mirrors attached to a movement means for selectively positioning one of the mirrors proximate the quarter waveplate.
Claim 17
Dependent Claim
21 words
The system of claim 7, wherein the adjustable aberration compensator comprises a beamsplitter, a quarter waveplate, and a piezo-electric surface mirror.
Claim 18
Dependent Claim
104 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having at least three data surfaces, the data surfaces separated alternately by air spaces and substrate layers; a lens for focussing the beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered by the substrate layers which alternately separate the data surfaces; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 19
Dependent Claim
104 words
An optical data storage system comprising: a laser for providing a laser beam; an optical medium having at least three data surfaces, the data surfaces separated alternately by air spaces and substrate layers; a lens for focussing the beam to one of the data surfaces; an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered by the substrate layers which alternately separate the data surfaces; and an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
Claim 20
Dependent Claim
15 words
The system of claim 11, wherein the aberration compensator comprises a variable thickness transparent element.
Claim 21
Dependent Claim
17 words
The system of claim 11, wherein the aberration compensator comprises a moveable transparent member having stepped thicknesses.
Claim 22
Dependent Claim
17 words
The system of claim 11, wherein the aberration compensator comprises a rotatable transparent member having stepped thicknesses.
Claim 23
Dependent Claim
25 words
The system of claim 11, wherein the aberration compensator comprises a pair of complementary transparent triangular blocks which may be moved relative to one another.
Claim 24
Dependent Claim
18 words
The system of claim 11, wherein the aberration compensator comprises an aspheric lens having a spherical aberration surface.
Claim 25
Dependent Claim
22 words
The system of claim 11, wherein the aberration compensator comprises a convex and concave lens which are moveable relative to one another.
Claim 26
Dependent Claim
25 words
The system of claim 11, wherein the aberration compensator comprises a rotatable hologram having a plurality of spherical aberration compensation recordings which are angularly separated.
Claim 27
Dependent Claim
51 words
The system of claim 11, wherein the aberration compensator comprises a beamsplitter, a quarter waveplate located on one side of the beamsplitter and a plurality of mirrors with aberration correction surfaces, the plurality of mirrors attached to a movement means for selectively positioning one of the mirrors proximate the quarter waveplate.
Claim 28
Dependent Claim
20 words
The system of claim 11, wherein the aberration compensator comprises a beamsplitter, a quarter waveplate and a piezo-electric surface mirror.
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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) | 1996-04-12 | 1996-10-12 | 1997-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-12 | 2000-10-12 | 2001-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-12 | 2004-10-12 | 2005-04-13 | $7700.00 | Window Closed / Lapsed |