US3568180A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Encoder
Assignee: Dixi SA
•
Filing: 1967-11-01
•
Granted: 1971-03-02
•
Expires: 1987-11-01
Abstract
Abstract An encoder having a number of output circuits including each a resistor of which the resistance value depends on the magnetic field intensity in it, the field intensity being controlled by a code track associated with each resistor.
Inventors
- 👤 Eduard Rosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:08
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/147; H; H03; H03M; H03M1/00; H03M1/12; H03M1/22
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
134 words
EncodEr comprising a stator and a rotor, stationary permanent magnet means and magnetic circuit means forming air gap means on said stator, a number of code tracks of ferromagnetic material mounted on said rotor and rotatable in said air gap means, the magnetic flux in said air gap means being locally controlled by each of said code tracks, a number of resistor means of which the resistance value depends on the magnetic flux therein mounted each of said stator and in said air gap means within reach of a flux portion controlled by one of said code tracks, and each of said resistor means being connected into an output circuit for transmitting a code signal depending on the magnetic flux in this resistor means and on the configuration of the associated code track respectively.
Claim 2
Dependent Claim
134 words
EncodEr comprising a stator and a rotor, stationary permanent magnet means and magnetic circuit means forming air gap means on said stator, a number of code tracks of ferromagnetic material mounted on said rotor and rotatable in said air gap means, the magnetic flux in said air gap means being locally controlled by each of said code tracks, a number of resistor means of which the resistance value depends on the magnetic flux therein mounted each of said stator and in said air gap means within reach of a flux portion controlled by one of said code tracks, and each of said resistor means being connected into an output circuit for transmitting a code signal depending on the magnetic flux in this resistor means and on the configuration of the associated code track respectively.
Claim 3
Dependent Claim
109 words
Encoder according to claim 1, wherein said permanent magnet is of substantially cylindrical form and fixed to the end wall of a pot of soft iron, an air gap being formed between the free end of said permanent magnet and the rim of said pot, a cylindrical portion of said rotor disposed in said air gap and surrounding said free end of the permanent magnet, a number of flat rings of ferromagnetic material mounted on said rotor and maintained in spaced position by spacing elements and a ring of nonmagnetizable material fixed to said rim of the pot, said resistor means being accommodated in said ring of nonmagnetizable material.
Claim 4
Dependent Claim
23 words
Encoder according to claim 1, wherein each resistor means and its associated code track are disposed in series in the same air gap.
Claim 5
Dependent Claim
18 words
Encoder according to claim 3, wherein a pole piece is inserted between each code track and resistor means.
Claim 6
Dependent Claim
27 words
Encoder according to claim 4, wherein the cross section of each pole decreases from its end adjacent the resistor means towards its end adjacent the code track.
Claim 7
Dependent Claim
21 words
Encoder according to claim 1, wherein common permanent magnet for several parallel-connected magnetic paths with a resistor in each is provided.
Claim 8
Dependent Claim
16 words
Encoder according to claim 6, wherein in that the resistors are disposed in circumferentially staggered positions.
Claim 9
Dependent Claim
34 words
Encoder according to claim 6, wherein a radial magnet field is set up in an air gap between a rotor and a stator, whereby several code tracks are disposed axially staggered on the rotor.
Claim 10
Dependent Claim
19 words
Encoder acccording to claim 1, wherein an independent magnetic path is associated with each of a number of resistors.
Claim 11
Dependent Claim
44 words
Encoder according to claim 9, wherein each magnetic path has two air gaps arranged in series or in parallel, whereby the resistor is disposed in one of the air gaps while a code track of ferromagnetic material displaceably engages into the other air gap.
References Cited (Backward Citations)
US2978545A
Cited
US3041414A
Cited
US3037092A
Cited
US3051943A
Cited
US3007067A
Cited
US3077520A
Cited
US3251054A
Cited
US3274575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |