US3728699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for synchronizing oscillation of read/write heads with the rotation of a data storage disc pack
Assignee: Information Storage Systems Inc
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Filing: 1971-08-16
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Granted: 1973-04-17
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Expires: 1991-08-16
Abstract
Abstract Apparatus is described for oscillating the read/write head carriage of a rotary drive mechanism for data storage disc pack. An optical sensing device is employed to determine the angular phase and frequency of rotation of the disc pack, and a phase discriminator compares the sensed frequency with the output of an oscillator to phase-lock the oscillator thereto. The resulting oscillation signal is fed to an electromagnetic actuator to cause oscillation of the read/write head in synchronism with the rotation of the disc pack.
Inventors
- 👤 F Sordello
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/596; G11B5/59605; G11B5/59616; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1418
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
Apparatus for oscillating a data transfer device with respect to a rotating data storage device comprising means for sensing the angular phase and frequency of said rotating storage device, means for generating an oscillation signal, means responsive to the sensed angular phase and frequency of said rotating storage device by causing the phase and frequency of the oscillation signal to be related in a predetermined manner to the phase and frequency of rotation of said storage device during each rotation of the storage device, and means for converting the resulting oscillation signal into corresponding oscillatory motion of said data transfer device with respect to said storage device whereby the oscillatory motion of said data transfer device is also related in a predetermined manner to the angular frequency of said rotating storage device.
Claim 2
Dependent Claim
132 words
Apparatus for oscillating a data transfer device with respect to a rotating data storage device comprising means for sensing the angular phase and frequency of said rotating storage device, means for generating an oscillation signal, means responsive to the sensed angular phase and frequency of said rotating storage device by causing the phase and frequency of the oscillation signal to be related in a predetermined manner to the phase and frequency of rotation of said storage device during each rotation of the storage device, and means for converting the resulting oscillation signal into corresponding oscillatory motion of said data transfer device with respect to said storage device whereby the oscillatory motion of said data transfer device is also related in a predetermined manner to the angular frequency of said rotating storage device.
Claim 3
Dependent Claim
84 words
The apparatus of claim 1 for oscillating a data storage device wherein said means for sensing the angular phase and frequency of said rotating storage device continually senses the same during oscillation of said data transfer device, and said means responsive to the sensed angular phase and frequency of said rotating storage device maintains the phase and frequency of the oscillation signal in said predetermined relationship to the phase and frequency of rotation of said storage device during oscillation of said data transfer device.
Claim 4
Dependent Claim
50 words
The apparatus of claim 1 for oscillating a data transfer device wherein said means for converting the resulting oscillation signal into corresponding oscillatory motion of said data transfer device produced oscillatory motion of said data transfer device having substantially the same frequency as the frequency of said rotating storage device.
Claim 5
Dependent Claim
74 words
The apparatus of claim 1 for oscillating a data transfer device wherein said data storage device comprises a pack of coaxial magnetic disks which are axially rotated, and said means for sensing the angular phase and frequency of said rotation thereof includes an optical transducer responsive to the passage thereby of a discontinuity in one of said discs by generating a signal indicative of the angular phase and frequency of rotation of said pack.
Claim 6
Dependent Claim
96 words
The apparatus of claim 4 for oscillating a data transfer device wherein said means responsive to the sensed angular phase and frequency of said rotating data transfer device includes a phase discriminator for phase locking the output of said means for generating an oscillation signal to the frequency of the signal generated by said optical transducer to thereby phase lock said output with the phase and frequency of rotation of said disc pack to provide said predetermined relationships between the frequency and phase of the disc pack rotation and oscillatory motion of the data transfer device.
Claim 7
Dependent Claim
52 words
The apparatus of claim 5 for oscillating a data transfer device wherein means are provided for filtering the output signal of said means for generating an oscillation signal to produce a sinusoidal waveform therefrom for direction to said means for converting said oscillation signal into oscillatory motion of said data transfer device.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |