US3793598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Delay line and filter comprising magnetizable crystalline material having periodic structure of cylindrical magnetic domains
Assignee: US Philips Corp
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Filing: 1973-03-15
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Granted: 1974-02-19
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Expires: 1993-03-15
Abstract
Abstract A device for the processing of signals, comprising a wafer of a magnetic material with a lattice of cylindrical magnetic domains located in a magnetic field, which wafer is provided with a transmitter and a sensor. Signals on the transmitter and on the sensor have a time delay relative to each other. The delay time is continuously variable by varying the strength of the magnetic field. An alternative application as a tunable frequency filter is possible.
Inventors
- 👤 M Hofelt
- 👤 W Druyvesteyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:47
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0825; G11C19/085; H01; H01F; H01F10/00; H01F10/08; H01F10/10; H01F10/18; H01F10/20; H01F10/24; H03H9/30; H03H9/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A device for the processing of signals, comprising a central body of crystalline material, an input signal converter and an output signal converter, respectively, coupled to said body, and means for producing a uniform magnetic field of variable strength to act upon the central body, the body of crystalline material consisting of a wafer of magnetisable material with an easy axis of magnetisation which is substantially perpendicular to the plane of the wafer and a given direction of magnetization, said wafer having a periodic structure of cylindrical magnetic domains whose direction of magnetisation is opposite to the given direction of magnetisation of the rest of the wafer, the input signal converter converting an input signal into a magnetic signal and the output signal converter reconverting the magnetic signal into an output signal, and the means for producing a magnetic field to act upon the body producing a field of variable strength whose direction substantially coincides with the easy axis of magnetisation of the wafer material.
Claim 2
Independent Claim
165 words
A device for the processing of signals, comprising a central body of crystalline material, an input signal converter and an output signal converter, respectively, coupled to said body, and means for producing a uniform magnetic field of variable strength to act upon the central body, the body of crystalline material consisting of a wafer of magnetisable material with an easy axis of magnetisation which is substantially perpendicular to the plane of the wafer and a given direction of magnetization, said wafer having a periodic structure of cylindrical magnetic domains whose direction of magnetisation is opposite to the given direction of magnetisation of the rest of the wafer, the input signal converter converting an input signal into a magnetic signal and the output signal converter reconverting the magnetic signal into an output signal, and the means for producing a magnetic field to act upon the body producing a field of variable strength whose direction substantially coincides with the easy axis of magnetisation of the wafer material.
Claim 3
Dependent Claim
39 words
A device as claimed in claim 1, wherein the wafer of magnetisable material has dimensions for which a dimensional resonance frequency is imposed on the wave phenomena which can be produced in the periodic structure of cylindrical magnetic domains.
Claim 4
Dependent Claim
39 words
A device as claimed in claim 1, wherein the wafer of magnetisable material has dimensions for which a radial resonance frequency is imposed on the wave phenomena which can be produced in the periodic structure of cylindrical magnetic domains.
Claim 5
Dependent Claim
27 words
A device as claimed in claim 1, wherein the input signal converter and the output signal converter, respectively, convert electrical signals into magnetic signals and vice versa.
Claim 6
Dependent Claim
29 words
A device as claimed in claim 4, wherein at least one of the signal converters is a flat winding of electrically conductive material on the wafer of magnetisable material.
Claim 7
Dependent Claim
30 words
A device as claimed in claim 2, wherein tHe wafer is provided with a pattern of series-connected flat windings of electrically conductive material defining the periodicity of the wave phenomena.
Claim 8
Dependent Claim
30 words
A device as claimed in claim 6, wherein the ends of the pattern of windings are connected to two connection terminals each for a signal input and a signal output.
Claim 9
Independent Claim
99 words
A device for processing signals, comprising a wafer-like body of crystalline, magnetisable material, said body having an easy axis of magnetisation substantially perpendicular to the plane of the wafer and having a periodic structure of cylindrical magnetic domains each magnetised in the direction opposite to the direction of magnetisation of the rest of the body, the device further comprising means for producing a magnetic signal in the body and means for producing a uniform magnetic field of variable strength to act upon the body, the direction of the field being substantially parallel to the said easy axis of magnetisation.
Claim 10
Independent Claim
99 words
A device for processing signals, comprising a wafer-like body of crystalline, magnetisable material, said body having an easy axis of magnetisation substantially perpendicular to the plane of the wafer and having a periodic structure of cylindrical magnetic domains each magnetised in the direction opposite to the direction of magnetisation of the rest of the body, the device further comprising means for producing a magnetic signal in the body and means for producing a uniform magnetic field of variable strength to act upon the body, the direction of the field being substantially parallel to the said easy axis of magnetisation.
References Cited (Backward Citations)
US3138789A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |