US5446723A
Expired / Lapsed
US
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Multiple data surface optical data storage system
Assignee: Mitsubishi Electric Corp
•
Filing: 1995-01-10
•
Granted: 1995-08-29
•
Expires: 2015-01-10
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
2026-11-09 06:00
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: 40
Claim 1
Independent Claim
178 words
An optical data storage system comprising: an optical data storage medium having at least one contiguous data surface, each data surface having a first continuous track portion at a first elevation and having a second continuous track portion at a second elevation different from the first elevation; a radiation source for producing a radiation beam; a focusing device for focusing the radiation beam to a selected one of the data surfaces; a movement device for moving the medium relative to the radiation beam; a data signal generator for receiving a return radiation beam from the medium and generating a data signal responsive thereto; a tracking signal generator for receiving a return radiation beam from the medium and selectively generating a first and a second tracking signal; and a beam positioning device connected to the track signal generator for positioning the beam along the first continuous track portion of a data surface responsive to the first tracking signal and positioning the beam along the second continuous track portion of the same data surface responsive to the second tracking signal.
Claim 2
Dependent Claim
178 words
An optical data storage system comprising: an optical data storage medium having at least one contiguous data surface, each data surface having a first continuous track portion at a first elevation and having a second continuous track portion at a second elevation different from the first elevation; a radiation source for producing a radiation beam; a focusing device for focusing the radiation beam to a selected one of the data surfaces; a movement device for moving the medium relative to the radiation beam; a data signal generator for receiving a return radiation beam from the medium and generating a data signal responsive thereto; a tracking signal generator for receiving a return radiation beam from the medium and selectively generating a first and a second tracking signal; and a beam positioning device connected to the track signal generator for positioning the beam along the first continuous track portion of a data surface responsive to the first tracking signal and positioning the beam along the second continuous track portion of the same data surface responsive to the second tracking signal.
Claim 3
Dependent Claim
16 words
The system of claim 1, wherein the first continuous track portion is comprised of a groove.
Claim 4
Dependent Claim
17 words
The system of claim 1, wherein the first continuous track portion is comprised of an inverse groove.
Claim 5
Dependent Claim
17 words
The system of claim 1, wherein the optical data storage medium has a plurality of data surfaces.
Claim 6
Dependent Claim
34 words
The system of claim 4, wherein the first continuous track portion of a first data surface comprises a groove, and the first continuous track portion of a second data surface comprises an inverse groove.
Claim 7
Dependent Claim
25 words
The system of claim 4, wherein the first continuous track portions of a first data surface and a second data surface are comprised of grooves.
Claim 8
Dependent Claim
26 words
The system of claim 4, wherein the first continuous track portions of a first data surface and a second data surface are comprised of inverse grooves.
Claim 9
Dependent Claim
25 words
The system of claim 4, wherein a first and a second data surface of the optical data storage medium are separated by an air space.
Claim 10
Dependent Claim
26 words
The system of claim 4, wherein a first and a second data surface of the optical data storage medium are separated by a solid transparent member.
Claim 11
Dependent Claim
28 words
The system of claim 1, wherein the ratio of the width of the first continuous track portion to the width of the second continuous track portion is 0.6.
Claim 12
Dependent Claim
18 words
The system of claim 1, wherein at least one of the data surfaces comprises a ROM data surface.
Claim 13
Dependent Claim
18 words
The system of claim 1, wherein at least one of the data surfaces comprises a WORM material coating.
Claim 14
Dependent Claim
19 words
The system of claim 1, wherein at least one of the data surfaces comprises a phase change material coating.
Claim 15
Dependent Claim
18 words
The system of claim 1, wherein at lease one of the data surfaces comprises a magneto-optic material coating.
Claim 16
Dependent Claim
12 words
The system of claim 1, wherein the radiation source comprises a laser.
Claim 17
Dependent Claim
79 words
The system of claim 1, wherein the optical data storage medium comprises a first substrate having a first data surface, a second substrate having a second data surface, a support device for supporting the first and second substrates in spaced apart relationship, an air space located between the first and second substrates, the first data surface located between the first substrate and the air space, and the second data surface located between the second substrate and the air space.
Claim 18
Dependent Claim
66 words
The system of claim 1, wherein the optical data storage medium comprises a first substrate having a first data surface, a second substrate having a second data surface, a solid transmissive member located between the first and second substrate, the first data surface located between the first substrate and the transmissive member and the second data surface located between the second substrate and the transmissive member.
Claim 19
Dependent Claim
32 words
The system of claim 1, wherein the optical data storage medium is a disk and the first and second continuous track portions are located in a spiral pattern on the data surfaces.
Claim 20
Dependent Claim
31 words
The system of claim 1, wherein the optical data storage medium is a disk and the first and second continuous track portions are located in a concentric pattern on the disk.
Claim 21
Dependent Claim
229 words
An optical data storage system comprising: an optical data storage medium having at least one contiguous data surface, each data surface having a first continuous track portion at a first elevation and having a second continuous track portion at a second elevation different from the first elevation; a radiation source for producing a radiation beam; a focusing device means for focusing the radiation beam to a selected one of the data surfaces; a movement device for moving the medium relative to the radiation beam; a data signal generator for receiving a return radiation beam from the medium and generating a data signal responsive thereto; an optical detector having a first and second sections for receiving a return radiation beam from the medium, each section generating an intensity signal responsive to the amount of radiation received at each section; a comparator device connected to the optical detector for comparing the intensity signals and generating a tracking signal responsive thereto; a selective inversion device connected to the comparator device for selectively generating an inverted tracking signal; and a beam positioning device for receiving the tracking signal and the inverted tracking signal and positioning the beam along the first continuous track portion of a data surface responsive to the tracking signal and positioning the beam along the second continuous track portion of the same data surface responsive to the inverted tracking signal.
Claim 22
Dependent Claim
229 words
An optical data storage system comprising: an optical data storage medium having at least one contiguous data surface, each data surface having a first continuous track portion at a first elevation and having a second continuous track portion at a second elevation different from the first elevation; a radiation source for producing a radiation beam; a focusing device means for focusing the radiation beam to a selected one of the data surfaces; a movement device for moving the medium relative to the radiation beam; a data signal generator for receiving a return radiation beam from the medium and generating a data signal responsive thereto; an optical detector having a first and second sections for receiving a return radiation beam from the medium, each section generating an intensity signal responsive to the amount of radiation received at each section; a comparator device connected to the optical detector for comparing the intensity signals and generating a tracking signal responsive thereto; a selective inversion device connected to the comparator device for selectively generating an inverted tracking signal; and a beam positioning device for receiving the tracking signal and the inverted tracking signal and positioning the beam along the first continuous track portion of a data surface responsive to the tracking signal and positioning the beam along the second continuous track portion of the same data surface responsive to the inverted tracking signal.
Claim 23
Dependent Claim
16 words
The system of claim 20, wherein the first continuous track portion is comprised of a groove.
Claim 24
Dependent Claim
17 words
The system of claim 20, wherein the first continuous track portion is comprised of an inverse groove.
Claim 25
Dependent Claim
17 words
The system of claim 21, wherein the optical data storage medium has a plurality of data surfaces.
Claim 26
Dependent Claim
34 words
The system of claim 23, wherein the first continuous track portion of a first data surface comprises a groove, and the first continuous track portion of a second data surface comprises an inverse groove.
Claim 27
Dependent Claim
25 words
The system of claim 23, wherein the first continuous track portions of a first data surface and a second data surface are comprised of grooves.
Claim 28
Dependent Claim
26 words
The system of claim 23, wherein the first continuous track portions of a first data surface and a second data surface are comprised of inverse grooves.
Claim 29
Dependent Claim
25 words
The system of claim 23, wherein a first and a second data surface of the optical data storage medium are separated by an air space.
Claim 30
Dependent Claim
26 words
The system of claim 23, wherein a first and a second data surface of the optical data storage medium are separated by a solid transparent member.
Claim 31
Dependent Claim
28 words
The system of claim 20, wherein the ratio of the width of the first continuous track portion to the width of the second continuous track portion is 0.6.
Claim 32
Dependent Claim
18 words
The system of claim 20, wherein at least one of the data surfaces comprises a ROM data surface.
Claim 33
Dependent Claim
18 words
The system of claim 20, wherein at least one of the data surfaces comprises a WORM material coating.
Claim 34
Dependent Claim
19 words
The system of claim 20, wherein at least one of the data surfaces comprises a phase change material coating.
Claim 35
Dependent Claim
18 words
The system of claim 20, wherein at least one of the data surfaces comprises a magneto-optic material coating.
Claim 36
Dependent Claim
12 words
The system of claim 20, wherein the radiation source comprises a laser.
Claim 37
Dependent Claim
79 words
The system of claim 20, wherein the optical data storage medium comprises a first substrate having a first data surface, a second substrate having a second data surface, a support device for supporting the first and second substrates in spaced apart relationship, an air space located between the first and second substrates, the first data surface located between the first substrate and the air space, and the second data surface located between the second substrate and the air space.
Claim 38
Dependent Claim
66 words
The system of claim 20, wherein the optical data storage medium comprises a first substrate having a first data surface, a second substrate having a second data surface, a solid transmissive member located between the first and second substrate, the first data surface located between the first substrate and the transmissive member and the second data surface located between the second substrate and the transmissive member.
Claim 39
Dependent Claim
32 words
The system of claim 20, wherein the optical data storage medium is a disk and the first and second continuous track portions are located in a spiral pattern on the data surface.
Claim 40
Dependent Claim
31 words
The system of claim 20, wherein the optical data storage medium is a disk and the first and second continuous track portions are located in a concentric pattern on the disk.
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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) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |