US3838451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic tape reproducing system having secondary shorting of a rotary transformer for head switching
Assignee: Panasonic Holdings Corp
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Filing: 1973-06-15
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Granted: 1974-09-24
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Expires: 1993-06-15
Abstract
Abstract A magnetic video tape recorder has a plurality of rotary heads, transistor switching circuits are connected to secondary windings of rotary transformers which are coupled to each of the rotary heads so as to short the secondary winding when a control signal is applied to the base thereof. The control signal serves to control the operation of the transistor switching circuits in such a way that only one complete field signal at a time from among the head output signals is supplied to succeeding reproducing circuits, so that there is reproduced a still or a slow-motion picture.
Inventors
- 👤 M Mino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:06
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/783
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
218 words
A magnetic tape system for reproducing television signals containing vertical synchronizing pulses, comprising: a rotary head assembly having a guide drum and a rotary disc within said drum, said rotary disc having a plurality of magnetic heads thereon which function as magnetic transducers for signals recorded on a magnetic tape, and said magnetic tape being wound around the peripheral surface of said guide drum; a plurality of rotary transformers having rotary core parts with primary windings wound thereon and fixed core parts having secondary windings wound thereon, respectively, said primary windings being coupled to said magnetic heads; a reproducing circuit for reproducing television signals which is coupled to said secondary windings; a detecting means for generating a signal which represents a phase angle of the rotation of said rotary disc each time one rotation of said rotary disc is completed; a means coupled to said detecting means and to said reproducing circuit for generating control signals in accordance with vertical synchronizing pulses contained in said reproduced television signals and said signals generated by said detecting means; and a plurality of switching means coupled to said second windings for shorting said secondary windings in accordance with said control signals so as to transmit unit information signals, such as one field signal of television signals, successively to said reproducing circuit.
Claim 2
Dependent Claim
218 words
A magnetic tape system for reproducing television signals containing vertical synchronizing pulses, comprising: a rotary head assembly having a guide drum and a rotary disc within said drum, said rotary disc having a plurality of magnetic heads thereon which function as magnetic transducers for signals recorded on a magnetic tape, and said magnetic tape being wound around the peripheral surface of said guide drum; a plurality of rotary transformers having rotary core parts with primary windings wound thereon and fixed core parts having secondary windings wound thereon, respectively, said primary windings being coupled to said magnetic heads; a reproducing circuit for reproducing television signals which is coupled to said secondary windings; a detecting means for generating a signal which represents a phase angle of the rotation of said rotary disc each time one rotation of said rotary disc is completed; a means coupled to said detecting means and to said reproducing circuit for generating control signals in accordance with vertical synchronizing pulses contained in said reproduced television signals and said signals generated by said detecting means; and a plurality of switching means coupled to said second windings for shorting said secondary windings in accordance with said control signals so as to transmit unit information signals, such as one field signal of television signals, successively to said reproducing circuit.
Claim 3
Dependent Claim
63 words
A magnetic tape apparatus as cliamed in claim 1, wherein said plurality of switching means consists of a plurality of transistors, the collector and emitter electrodes of said transistors being connected to said secondary windings of the respective rotary transformers and the base electrodes of said transistors being coupled to said control signal generating means so as to provide with said control signals.
Claim 4
Dependent Claim
67 words
A magnetic tape apparatus as claimed in claim 1, wherein said plurality of switching means consists of a plurality of field-effect-transistors, the drain and source electrodes of each of said field-effect-transistors being connected to said secondary windings of said rotary transformers and the gate electrode of each of said field-effect-transistors being coupled to said control signal generating means so as to be provided with said control signals.
Claim 5
Dependent Claim
68 words
A magnetic tape apparatus as claimed in claim 1, wherein said rotary head assembly has three magnetic heads and said plurality of switching means consists of three transistors, the collector and emitter electrodes of which are connected to said secondary windings of said rotary transformers and the base electrodes of which are coupled to said control signal generating means so as to be provided with said control signals.
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) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |