US3772675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic analog-to-digital encoder
Assignee: Singer Co
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Filing: 1972-05-15
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Granted: 1973-11-13
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Expires: 1992-05-15
Abstract
Abstract A magnetic shaft rotation-to-digital encoder is provided which includes magnetic sensors positioned adjacent to a high speed and a low speed magnetically coded rotatable disc, the sensors being wound with two excitation windings and an output winding, and being wired for coincident current operation in an X-Y matrix form. When X and Y signals coincide in a particular sensor core, the core is set to a logic ''''1,'''' unless the sensor senses an inhibiting magnetic field on its associated disc. Each of the two rotatable discs has four binary coded magnetic tracks on its surface in the embodiment to be described. By positioning five magnetic sensors on the least significant digit track of the high speed disc, a total of eight tracks provide output signals which, when applied to appropriate logic circuitry, produce 11 output binary bits in any desired code, such as the ICAO altitude code which is in general use in conjunction with aircraft transponders.
Inventors
- 👤 N Bose
- 👤 H Sani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:43
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/22; H03M1/24; H03M1/28; H03M1/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
A magnetic shaft rotation-to-digital encoder system comprising: an encoder unit including at least one rotatable disc having magnetically coded concentric tracks on at least one surface thereof; a plurality of sensors mounted in magnetically coupled relationship with respective ones of said tracks, each of said sensors including a magnetic core having a plurality of windings thereon including a first winding and a second winding and a sense winding; X-Y matrix means including first driver means connected to the first windings of said sensors and second driver means connected to the second windings of said sensors for selectively setting the cores of said sensors to a predetermined magnetic state unless inhibited by magnetized portions of the respective coded tracks of said disc; and output circuitry connected to the sense windings of the sensors for providing a multi-bit output corresponding to the angular position of the disc.
Claim 2
Dependent Claim
145 words
A magnetic shaft rotation-to-digital encoder system comprising: an encoder unit including at least one rotatable disc having magnetically coded concentric tracks on at least one surface thereof; a plurality of sensors mounted in magnetically coupled relationship with respective ones of said tracks, each of said sensors including a magnetic core having a plurality of windings thereon including a first winding and a second winding and a sense winding; X-Y matrix means including first driver means connected to the first windings of said sensors and second driver means connected to the second windings of said sensors for selectively setting the cores of said sensors to a predetermined magnetic state unless inhibited by magnetized portions of the respective coded tracks of said disc; and output circuitry connected to the sense windings of the sensors for providing a multi-bit output corresponding to the angular position of the disc.
Claim 3
Dependent Claim
66 words
The magnetic shaft rotation-to-digital encoder system defined in claim 1, and which includes a second disc rotatably mounted in said encoder unit in coaxial relationship with said first-named disc and mechanically coupled to said first-named disc to be driven thereby at a fraction of the rotational speed of said first-named disc, said second disc also having magnetically coded concentric tracks on at least one surface thereof.
Claim 4
Dependent Claim
57 words
The magnetic shaft rotation-to-digital encoder system defined in claim 1, in which said output circuitry includes shift register means for receiving output signals from said sense windings as said sensors are successively selected in said X-Y matrix, and decoding circuitry coupled to said shift register and responding to the information therein for providing the aforesaid multi-bit outputs.
Claim 5
Dependent Claim
29 words
The magnetic shaft rotation-to-digital encoder system defined in claim 2, in which each of the two discs contains four concentric tracks magnetized in accordance with a predetermined binary code.
Claim 6
Dependent Claim
28 words
The magnetic shaft rotation-to-digital encoder system defined in claim 4, in which the sensors are positioned with respect to the tracks on the disc for a U-scan read-out.
Claim 7
Dependent Claim
58 words
The magnetic shaft rotation-to-digital encoder system defined in claim 1, in which each of said tracks is coded by magnetic segments of a particular arcuate length, and which includes five of the said sensors mounted to sense the magnetic segments in one of said tracks and spaced from one another to correspond effectively to one magnetic segment length.
Claim 8
Dependent Claim
29 words
The magnetic shaft rotation-to-digital encoder system defined in claim 2, in which said output circuitry includes decoding networks for producing multi-bit outputs corresponding to the standard ICAO altitude code.
References Cited (Backward Citations)
US3171104A
Cited
US3509555A
Cited
US3478346A
Cited
US3504359A
Cited
US3466646A
Cited
US3525094A
Cited
US3540036A
Cited
US3513469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |