US3774172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Random access multiple disc optical information storage system
Assignee: Individual
•
Filing: 1972-03-23
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Granted: 1973-11-20
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Expires: 1992-03-23
Abstract
Abstract A plurality of rotating disc storage media are precisely positioned with respect to a central movable arm and transducer such that the transducer can be selectively and sequentially positioned to a desired track on a desired disc in the group of discs. A second group of discs, positioned on the same rotators as the first group are contacted by a second arm and transducer. The first transducer can be reading or writing on a disc in the first group while the second transducer is being positioned to a desired track on a desired disc in the second group. Thus the time required to move the transducer is not lost since another transducer is reading or writing simultaneously. This storage is particularly adapted for high packing density optical storage means whereby a very large storage volume can be rapidly accessed on a random basis.
Inventors
- 👤 D Silverman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:27
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/02; G11B27/031; G11B27/034; G11B17/00; G11B17/22; G11B17/26; G11B27/002; G11B7/00; G11B7/002; G11B7/0037; G11B7/08; G11B7/085; G11B7/0857; G11B7/08576; G11B7/24; G11B7/28; G11C; G11C13/00; G11C13/04; G11C13/048; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/218
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
192 words
A multiple disc type digital information storage system comprising: a. at least two information discs positioned in spaced-apart relation on at least one disc rotator; b. at least the facing surfaces of each of said discs carrying information records comprising a base sheet attached to said disc and a thin layer of recording material on the outer surface of said base sheet, said material adapted to be modified over a spot area by exposing said spot area to a focused beam of laser energy of selected intensity; c. at least one transducer arm extending radially between said discs; d. a source of laser energy, including a single beam of said laser energy conducted radially along said arm; e. means to focus said beam of laser energy; and f. means to deflect said focused beam so as to make it incident sequentially on a first and a second of said facing surfaces of said recording material; whereby, by controlling the intensity of said beam and said means to deflect and simultaneously rotating said discs, digital information will be recorded sequentially on said first and second surfaces by said single beam on circular tracks.
Claim 2
Dependent Claim
192 words
A multiple disc type digital information storage system comprising: a. at least two information discs positioned in spaced-apart relation on at least one disc rotator; b. at least the facing surfaces of each of said discs carrying information records comprising a base sheet attached to said disc and a thin layer of recording material on the outer surface of said base sheet, said material adapted to be modified over a spot area by exposing said spot area to a focused beam of laser energy of selected intensity; c. at least one transducer arm extending radially between said discs; d. a source of laser energy, including a single beam of said laser energy conducted radially along said arm; e. means to focus said beam of laser energy; and f. means to deflect said focused beam so as to make it incident sequentially on a first and a second of said facing surfaces of said recording material; whereby, by controlling the intensity of said beam and said means to deflect and simultaneously rotating said discs, digital information will be recorded sequentially on said first and second surfaces by said single beam on circular tracks.
Claim 3
Dependent Claim
26 words
The multiple disc information system as in claim 1 in which said recording material comprises a Kalvar-like material that has previously been irradiated with ultraviolet light.
Claim 4
Dependent Claim
49 words
The multiple disc digital information storage system as in claim 1 including photoelectric means to detect the presence of laser light back scattered from said recording material; whereby the intensity of said back-scattered light will vary due to the presence or absence of an information spot on said record.
Claim 5
Dependent Claim
46 words
The multiple disc digital information system as in claim 3 in which said means to focus, and said photoelectric means together comprise a single information transducer, and said means to deflect comprises means to selectively and successively transduce information from said opposing faces of said discs.
Claim 6
Dependent Claim
75 words
The multiple disc digital information system as in claim 1 in which said arm is rotatable about an arm shaft, the axis of which is parallel to the axis of said rotator, and including at least a second rotator parallel to said first rotator and spaced at an equal distance from said arm shaft axis, at least two discs on said second rotator in the same planes as said two discs on said first rotator.
Claim 7
Dependent Claim
49 words
The multiple disc digital information system as in claim 5 including more than two spaced discs on each rotator and including means to axially relatively traverse said arm shaft and said rotators, whereby said arm can be sequantially positioned radially between any selected pair of discs on each rotator.
Claim 8
Dependent Claim
38 words
The multiple disc information system as in claim 1 in which said recording material comprises a thin layer of opaque material adapted to be removed over the area of said spot by said focused beam of laser energy.
Claim 9
Dependent Claim
22 words
The multiple disc digital information system as in claim 7 in which said opaque material comprises a thin layer of evaporizable metal.
Claim 10
Dependent Claim
21 words
The multiple disc digital information system as in claim 7 in which said opaque material comprises thin layer of organic material.
Claim 11
Dependent Claim
85 words
An information system comprising: a. a plurality of information records each having at least one information surface, said record surfaces arranged in radial symmetry with respect to an axis; b. means to store information on said surfaces in the form of patterns of spots; c. a Single optical transducer means for transducing information on said surfaces, said transducer rotatable about said axis; and d. means to place said single transducer in transducing relation with said patterns of spots, sequen tially on each of said surfaces.
Claim 12
Dependent Claim
85 words
An information system comprising: a. a plurality of information records each having at least one information surface, said record surfaces arranged in radial symmetry with respect to an axis; b. means to store information on said surfaces in the form of patterns of spots; c. a Single optical transducer means for transducing information on said surfaces, said transducer rotatable about said axis; and d. means to place said single transducer in transducing relation with said patterns of spots, sequen tially on each of said surfaces.
Claim 13
Dependent Claim
50 words
The system as in claim 10 in which said plurality of records surfaces comprise at least one pair of parallel, concentric discs and said surfaces are on opposed facing surfaces of said discs, and including means to place said transducer in operating relation sequentially with each of said opposing surfaces.
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |