US3594729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data retrieval system
Assignee: Sony Corp
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Filing: 1967-12-19
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Granted: 1971-07-20
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Expires: 1987-12-19
Abstract
Abstract In a data retrieval system employing a magnetic tape or other recording medium having index signals at intervals therealong for identifying respective tape portions and being moved past a head which is cyclically displaced to scan stripelike areas extending across the tape, the tape is driven at a high speed to rapidly bring a selected index signal near to the head and then the movement of the tape is continued at a low speed at which a plurality of the areas scanned by the head are in overlapping relation, and the head is operated to record or reproduce data signals only during one of its cyclical displacements upon the selected index signal reaching a predetermined position in the course of the continued low speed movement of the tape.
Inventors
- 👤 Saburo Uemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:01
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/21; H04N1/2166; H04N1/217; H04N1/2175; G; G11; G11B; G11B27/00; G11B27/02; G11B27/022; G11B27/024
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
244 words
A data retrieval system comprising a magnetic recording medium movable in a predetermined path and having index signals thereon at intervals for identifying respective portions thereof, a magnetic head mounted adjacent to said path at a recording and reproducing station and being operable to selectively record and reproduce data signals on each of said portions of the medium, means operative upon the selection of one of said index signals for moving said medium in said path at a high speed in the direction for rapidly bringing said one of said index signals and the respective medium portion near to said station, means operative when said one index signal nears said station to continue the movement of said medium at a predetermined low speed, means for imparting cyclical movement to said head across said path at a frequency proportional to said predetermined low speed of movement of said medium in said path so as to cause said head to scan a plurality of overlapping stripelike areas of the medium during movement of the latter at said low speed through a distance corresponding to each of said intervals, and means to operate said head during only one cyclical movement thereof to selectively record and reproduce data signals in corresponding stripelike area of said respective medium portion in response to said one index signal reaching a predetermined position relative to said station in the course of the continuing movement of the medium at said low speed. 1
Claim 2
Dependent Claim
244 words
A data retrieval system comprising a magnetic recording medium movable in a predetermined path and having index signals thereon at intervals for identifying respective portions thereof, a magnetic head mounted adjacent to said path at a recording and reproducing station and being operable to selectively record and reproduce data signals on each of said portions of the medium, means operative upon the selection of one of said index signals for moving said medium in said path at a high speed in the direction for rapidly bringing said one of said index signals and the respective medium portion near to said station, means operative when said one index signal nears said station to continue the movement of said medium at a predetermined low speed, means for imparting cyclical movement to said head across said path at a frequency proportional to said predetermined low speed of movement of said medium in said path so as to cause said head to scan a plurality of overlapping stripelike areas of the medium during movement of the latter at said low speed through a distance corresponding to each of said intervals, and means to operate said head during only one cyclical movement thereof to selectively record and reproduce data signals in corresponding stripelike area of said respective medium portion in response to said one index signal reaching a predetermined position relative to said station in the course of the continuing movement of the medium at said low speed. 1
Claim 3
Dependent Claim
56 words
A data retrieval system according to claim 1, in which the width of each of said stripelike areas is a major proportion of said distance, and the stripelike areas scanned by said head during the low speed movement of said medium have an overlap of at least one-half of said width of each of said areas.
Claim 4
Dependent Claim
45 words
A data retrieval system according to claim 2, in which said width of each of the stripelike areas is at least two-thirds of said distance, and said head is adapted to scan at least three of said overlapping areas in said distance along said medium.
Claim 5
Dependent Claim
46 words
A data retrieval system according to claim 2, in which the width of each of said stripelike areas is at least two-thirds of said distance, and said head is adapted to scan from three to five of said overlapping areas in said distance along the medium.
Claim 6
Dependent Claim
25 words
A data retrieval system according to claim 1, further comprising a second storing device operative selectively to record and to continuously reproduce said data signals.
Claim 7
Dependent Claim
50 words
A data retrieval system according to claim 5, further comprising means connected between said head and said storing device to pass a data signal reproduced by said storing device to said head only during said one cyclical movement of the head following said one index signal reaching said predetermined position.
Claim 8
Dependent Claim
46 words
A data retrieval systeM according to claim 5, further comprising means connected between said head and said storing device to pass a data signal reproduced by said head to said storing device for recording and subsequent reproduction of said recorded data signal by said storing device.
Claim 9
Dependent Claim
28 words
A data retrieval system according to claim 7, further comprising visual display means operable by data signals selectively reproduced by said storing device for displaying the corresponding data.
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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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |