US3842385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High performance transducer
Assignee: Individual
•
Filing: 1973-09-13
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Granted: 1974-10-15
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Expires: 1993-09-13
Abstract
Abstract An ''''all purpose'''' transducer is characterized in that a small input displacement is productive of a desirably large change in an electrical parameter.
Inventors
- 👤 W Bradley
- 👤 H Ast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:08
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/147
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
144 words
In a transducer for providing an electrical output that varies as a function of a displacement input, the combination comprising a. spaced poles of opposite polarity, b. a magnetic flux transmitting armature relatively movable longitudinally toward and away from the poles to increase and decrease, respectively, the flux transmission by the armature, c. a flux responsive element carried by the armature to pass said flux, said element characterized as having electrical impedance which varies as a function of the intensity of the flux passed by the element, and d. the armature having an overall range of movement between limits at one of which the flux transmission by the element is at a maximum, and there being means cooperating with the armature to cause the flux passed by said element to drop to near zero when the armature is at the other of said limits.
Claim 2
Dependent Claim
144 words
In a transducer for providing an electrical output that varies as a function of a displacement input, the combination comprising a. spaced poles of opposite polarity, b. a magnetic flux transmitting armature relatively movable longitudinally toward and away from the poles to increase and decrease, respectively, the flux transmission by the armature, c. a flux responsive element carried by the armature to pass said flux, said element characterized as having electrical impedance which varies as a function of the intensity of the flux passed by the element, and d. the armature having an overall range of movement between limits at one of which the flux transmission by the element is at a maximum, and there being means cooperating with the armature to cause the flux passed by said element to drop to near zero when the armature is at the other of said limits.
Claim 3
Dependent Claim
31 words
The combination of claim 1 in which the element is magnetoresistive and characterized as undergoing a resistance change of at least 400 per cent as the armature moves between sAid limits.
Claim 4
Dependent Claim
39 words
The combination of claim 1 wherein the armature extends laterally and has relatively wide portions movable longitudinally in alignment with said poles, and relatively narrow portions intermediate said wide portions, said element being located between said relatively narrow portions.
Claim 5
Dependent Claim
23 words
The combination of claim 1 including flux by-passing means extending between the poles to quantitatively by-pass flux therebetween as a function of temperature.
Claim 6
Dependent Claim
23 words
The combination of claim 1 including flux by-passing means extending adjacent the armature to quantitatively by-pass flux therebetween as a function of temperature.
Claim 7
Dependent Claim
30 words
The combination of claim 1 wherein said means includes a flux shorting bar extending laterally in proximate and generally parallel relation to the armature throughout said range of armature movement.
Claim 8
Dependent Claim
16 words
The combination of claim 1 including a longitudinally movable input member operatively connected with the armature.
Claim 9
Dependent Claim
27 words
The combination of claim 1 wherein said means includes auxiliary magnetic poles at the side of the armature opposite said first mentioned poles, and longitudinally spaced therefrom.
Claim 10
Dependent Claim
13 words
The combination of claim 1 including means for adjustably shifting the poles longitudinally.
Claim 11
Dependent Claim
38 words
The combination of claim 7 including a longitudinally extending shaft carrying the armature and spring means supporting the shaft for said longitudinal movement, the spring means balancing out the magnetic attraction forces at both extremes of shaft travel.
Claim 12
Dependent Claim
38 words
The combination of claim 10 including a housing enclosing the poles, armature and spring means, the shaft having an input motion receiving end portion accessible from the exterior of the housing, the spring means supported by the housing.
Claim 13
Dependent Claim
16 words
The combination of claim 1 wherein said range of movement is less than about 0.100 inch.
Claim 14
Dependent Claim
47 words
The combination of claim 1 wherein said means includes third and fourth magnetic poles at the side of the armature opposite said first mentioned poles, said third and fourth poles being of opposite polarities which are reversed in relation to the polarities of the first mentioned poles.
Claim 15
Dependent Claim
14 words
The combination of claim 11 including liquid substantially filling the interior of said housing.
Claim 16
Dependent Claim
16 words
The combination of claim 1 wherein said poles of opposite polarity are spaced apart generally laterally.
Claim 17
Dependent Claim
16 words
The combination of claim 1 wherein said poles of opposite polarity are spaced apart generally longitudinally.
Claim 18
Dependent Claim
19 words
The combination of claim 16 wherein said poles are on a tubular member which has a longitudinally extending axis.
Claim 19
Dependent Claim
22 words
The combination of claim 17 wherein said means includes a flux shorting bar extending generally longitudinally, the armature also extending generally longitudinally.
Claim 20
Dependent Claim
24 words
The combination of claim 18 wherein the flux shorting bar is tubular and receives at least portions of the armature and said tubular member.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |