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US3902167A
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US
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Magnetic thin film switch
Assignee: Honeywell Inc
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Filing: 1974-02-25
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Granted: 1975-08-26
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Expires: 1994-02-25
Abstract
Abstract A magnetically actuated switch capable of operating in a variety of modes utilizes a plated wire magnetic film switching element.
Inventors
- 👤 Olin S Lutes
- 👤 James O Holmen
- 👤 Richard L Kooyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:12
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/80; H03K17/84
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
91 words
A magnetically actuated switch comprising: a wire substrate; an anisotropic, essentially zeromagnetostrictive magnetic film covering the wire substrate, the magnetic film having an easy axis of magnetization oriented at an angle with respect to the circumferential direction; actuator means for applying an external magnetic field with a component along the axis of the wire substrate sufficient to change the state of the magnetically actuated switch from a first state to a second state; and output means for sensing whether the magnetically actuated switch is in the first or the second state.
Claim 2
Dependent Claim
91 words
A magnetically actuated switch comprising: a wire substrate; an anisotropic, essentially zeromagnetostrictive magnetic film covering the wire substrate, the magnetic film having an easy axis of magnetization oriented at an angle with respect to the circumferential direction; actuator means for applying an external magnetic field with a component along the axis of the wire substrate sufficient to change the state of the magnetically actuated switch from a first state to a second state; and output means for sensing whether the magnetically actuated switch is in the first or the second state.
Claim 3
Dependent Claim
15 words
The magnetically actuated switch of claim 1 wherein the output means comprises mechanical sensing means.
Claim 4
Dependent Claim
20 words
The magnetically actuated switch of claim 2 wherein the output means comprises means for sensing the torque on the wire.
Claim 5
Dependent Claim
15 words
The magnetically actuated switch of claim 1 wherein the output means comprises electrical sensing means.
Claim 6
Dependent Claim
14 words
The magnetically actuated switch of claim 1 wherein the output means comprises a coil.
Claim 7
Dependent Claim
35 words
The magnetically actuated switch of claim 1 and further comprising: input means for applying an input magnetic field with a component along the axis of the wire substrate, the magnetic field having a predetermined magnitude.
Claim 8
Dependent Claim
37 words
The magnetically actuated switch of claim 6 wherein the input means applies an input magnetic field with a component along the axis of the wire substrate sufficient to periodically reverse the magnetization direction of the magnetic film.
Claim 9
Dependent Claim
56 words
The magnetically actuated switch of claim 7 wherein the actuator means applies an actuating magnetic field with a component along the axis of the wire substrate sufficient to inhibit reversal of the magnetization direction of the magnetic film, and wherein the output means senses whether the magnetic film is in a reversing or a non-reversing state.
Claim 10
Dependent Claim
59 words
The magnetically actuated switch of claim 8 wherein the input means comprises: bias field means for applying a magnetic bias field to the magnetic film with a component along the axis of the wire substrate; and alternating field means for applying an alternating magnetic field to the magnetic film with a component along the axis of the wire substrate.
Claim 11
Dependent Claim
25 words
The magnetically actuated switch of claim 1 wherein the magnetic film has its easy axis of magnetization oriented along the axis of the wire substrate.
Claim 12
Dependent Claim
28 words
The magnetically actuated switch of claim 1 wherein the magnetic film has its easy axis of magnetization oriented in a direction intermediate between the axial and circumferential directions.
Claim 13
Dependent Claim
33 words
The magnetically actuated switch of claim 1 wherein the actuator means applies an external magnetic field for reversing the magnetization direction of the magnetic film from a first direction to a second direction.
Claim 14
Dependent Claim
30 words
The magnetically actuated switch of clAim 12 wherein the output means senses whether the magnetization direction of the magnetic film is aligned in the first direction or the second direction.
Claim 15
Dependent Claim
28 words
The magnetically actuated switch of claim 12 wherein output means senses the reversal of the magnetization direction of the magnetic film when an external magnetic field is applied.
Claim 16
Dependent Claim
21 words
The magnetically actuated switch of claim 12 and further comprising: reset means for resetting the magnetization direction of the magnetic film.
Claim 17
Dependent Claim
15 words
The magnetically actuated switch of claim 12 wherein the output means comprises mechanical sensing means.
Claim 18
Dependent Claim
21 words
The magnetically actuated switch of claim 12 wherein the output means comprises means for sensing the torque on the wire substrate.
Claim 19
Dependent Claim
15 words
The magnetically actuated switch of claim 12 wherein the output means comprises electrical sensing means.
Claim 20
Dependent Claim
15 words
The magnetically actuated switch of claim 12 wherein the electrical sensing means comprises a coil.
Claim 21
Dependent Claim
25 words
The magnetically actuated switch of claim 12 wherein the magnetic film has its easy axis of magnetization oriented along the axis of the wire substrate.
Claim 22
Dependent Claim
28 words
The magnetically actuated switch of claim 12 wherein the magnetic film has its easy axis of magnetization oriented in a direction intermediate between the axial and circumferential directions.
Claim 23
Dependent Claim
77 words
A magnetically actuated switch capable of changing from a first state to a second state in response to an external magnetic field, the magnetically actuated switch comprising: a wire substrate; an anisotropic, essentially zeromagnetostrictive magnetic film covering the wire substrate, the magnetic film having an easy axis of magnetization oriented at an angle with respect to the circumferential direction; and output means for sensing whether the magnetically actuated switch is in the first or the second state.
Claim 24
Dependent Claim
77 words
A magnetically actuated switch capable of changing from a first state to a second state in response to an external magnetic field, the magnetically actuated switch comprising: a wire substrate; an anisotropic, essentially zeromagnetostrictive magnetic film covering the wire substrate, the magnetic film having an easy axis of magnetization oriented at an angle with respect to the circumferential direction; and output means for sensing whether the magnetically actuated switch is in the first or the second state.
Claim 25
Dependent Claim
35 words
The magnetically actuated switch of claim 22 and further comprising: input means for applying an input magnetic field with a component along the axis of the wire substrate, the magnetic field having a predetermined magnitude.
Claim 26
Dependent Claim
37 words
The magnetically actuated switch of claim 23 wherein the input means applies an input magnetic field with a component along the axis of the wire substrate sufficient to periodically reverse the magnetization direction of the magnetic film.
Claim 27
Dependent Claim
52 words
The magnetically actuated switch of claim 24 wherein external magnetic field is applied along the axis of the wire substrate and is sufficient to inhibit reversal of the magnetization direction of the magnetic film, and wherein the output means senses whether the magnetic film is in a reversing or a non-reversing state.
Claim 28
Dependent Claim
59 words
The magnetically actuated switch of claim 25 wherein the input means comprises: bias field means for applying a magnetic bias field to the magnetic film with a component along the axis of the wire substrate; and alternating field means for applying an alternating magnetic field to the magnetic film with a component along the axis of the wire substrate.
Claim 29
Dependent Claim
27 words
The magnetically actuated switch of claim 22 wherein the external magnetic field reverses the magnetization direction of the film from a first directin to a second direction.
Claim 30
Dependent Claim
30 words
The magnetically actuated switch of claim 27 wherein the output means senses whether the magnetization direction of the magnetic film is aligned in the first direction or the second direction.
Claim 31
Dependent Claim
28 words
The magnetically actuated switch of claim 27 wherein output means senses the reversal of the magnetization direction of the magnetic film when an external magnetic field is applied.
Claim 32
Dependent Claim
21 words
The magnetically actuated switch of claim 27 and further comprising: reset means for resetting the magnetization direction of the magnetic film.
References Cited (Backward Citations)
US3228012A
Cited
US3434119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |