US4794473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast mode reel servo in a magnetic recording/reproducing apparatus
Assignee: Pioneer Corp
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Filing: 1987-05-29
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Granted: 1988-12-27
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Expires: 2007-05-29
Abstract
Abstract A reel speed servo for inclined recording tracks such as used in R-DAT. The two rotary magnetic heads are inclined at different azimuth angles. The relative speed between each of the heads and the tape is detected. Then the difference of these relative speeds is determined to thereby detect the speed of the tape, which is thus used in the reel speed servo.
Inventors
- 👤 Ken-ichiro Kawasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:29
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/46; G11B15/467; G11B15/4673; G11B15/4675; G11B15/4676; G11B15/1808; G11B15/1875
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
A magnetic reproducing apparatus for reproducing information from an inclined track on a magnetic tape, comprising: at least two rotary magnetic heads having respective azimuth angles with respect to a tape transport direction different from each other; detection circuit means for detecting at least two respective relative velocities between said magnetic tape and said rotary magnetic heads on the basis of respective output signals of said at least two rotary magnetic heads; operation circuit means for operation on output signals of said detection circuit representing said two relative velocities to produce an output signal corresponding to an absolute velocity of said magnetic tape; and servo circuit means for causing said magnetic tape to run in accordance with the output signal of said operation circuit at a predetermined velocity.
Claim 2
Dependent Claim
128 words
A magnetic reproducing apparatus for reproducing information from an inclined track on a magnetic tape, comprising: at least two rotary magnetic heads having respective azimuth angles with respect to a tape transport direction different from each other; detection circuit means for detecting at least two respective relative velocities between said magnetic tape and said rotary magnetic heads on the basis of respective output signals of said at least two rotary magnetic heads; operation circuit means for operation on output signals of said detection circuit representing said two relative velocities to produce an output signal corresponding to an absolute velocity of said magnetic tape; and servo circuit means for causing said magnetic tape to run in accordance with the output signal of said operation circuit at a predetermined velocity.
Claim 3
Dependent Claim
18 words
An apparatus as recited in claim 1, wherein said predetermined velocity differs from a velocity used in reproducing.
Claim 4
Dependent Claim
34 words
An apparatus as recited in claim 1, wherein said operation circuit means detects a difference between relative velocities of two of said rotary magnetic heads to produce said output signal of said operation circuit.
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) | 1991-12-27 | 1992-06-27 | 1992-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-27 | 1996-06-27 | 1996-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-27 | 2000-06-27 | 2000-12-27 | $7700.00 | Window Closed / Lapsed |