US3763478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driving system in magnetic single wall domain device
Assignee: Hitachi Ltd
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Filing: 1972-06-27
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Granted: 1973-10-02
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Expires: 1992-06-27
Abstract
Abstract In a magnetic domain device in which T-bar patterns made of permalloy, etc. are formed on a magnetic film for producing magnetic single wall domains and a rotating magnetic field is generated in said magetic film to transfer a magnetic domain, a driving system includes the connections of resonating capacitors and X and Y coils for forming a rotating magnetic field. The driving power for the device is much reduced by resonating the circuits comprising the coils and the capacitor at the frequency of the power source.
Inventors
- 👤 S Yoshizawa
- 👤 I Mikami
- 👤 G Kamoshita
- 👤 N Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:14
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/085
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
107 words
A magnetic domain driving system of resonating coil type comprising: a magnetic domain device made by forming a ferromagnetic film pattern on a magnetic film for generating a magnetic single wall domain; X and Y coils for generating a rotating field in the plane of said magnetic film by supplying sine and cosine currents thereto; a capacitor connected to each of said X and Y coils for forming a resonance circuit with said coil at the frequency of the rotating magnetic field; and current sources for supplying a periodic current including no d.c. component to each of the resonance circuits consisting of said coil and said capacitor.
Claim 2
Dependent Claim
107 words
A magnetic domain driving system of resonating coil type comprising: a magnetic domain device made by forming a ferromagnetic film pattern on a magnetic film for generating a magnetic single wall domain; X and Y coils for generating a rotating field in the plane of said magnetic film by supplying sine and cosine currents thereto; a capacitor connected to each of said X and Y coils for forming a resonance circuit with said coil at the frequency of the rotating magnetic field; and current sources for supplying a periodic current including no d.c. component to each of the resonance circuits consisting of said coil and said capacitor.
Claim 3
Dependent Claim
67 words
A magnetic domain driving system of resonating coil type according to claim 1, further comprising: a switch capable of performing on-off operation at the time when the periodic current flowing through said coil becomes zero, connected between said coil and said capacitor; and means for retaining the terminal voltage of said capacitor immediately before the opening of said switch during the period when the switch is opened.
Claim 4
Dependent Claim
55 words
A magnetic domain driving system of resonating coil type according to claim 1, further comprising: switching means for reversing the current flowing through one of said coils at the time when the periodic current becomes zero; and switching means for re-connecting the capacitor connected to the coil in reversed polarity at the time of reversal.
Claim 5
Dependent Claim
60 words
A magnetic domain driving system of resonating coil type according to claim 1, further comprising: switching means for reversing the polarity of the current flowing through one coil at the time when said current becomes zero; and switching means for isolating the capacitor connected to the coil and connecting another capacitor charged in opposite polarity at the time of reversal.
Claim 6
Dependent Claim
85 words
A magnetic domain driving system of resonating coil type according to claim 1, further comprising: d.c. current sources for stopping the rotating magnetic field at an arbitrary phase and allowing currents having the same value as those flowing through the respective coils at this moment to flow through the respective coils; switching means for isolating the capacitor at said moment; and means for retaining the terminal voltage of the capacitor immediately before said stopping of the rotating field till the time of re-starting the rotation.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |