WO1996019872B1 - Digital input and control device - Google Patents
Digital input and control deviceInfo
- Publication number
- WO1996019872B1 WO1996019872B1 PCT/US1995/016972 US9516972W WO9619872B1 WO 1996019872 B1 WO1996019872 B1 WO 1996019872B1 US 9516972 W US9516972 W US 9516972W WO 9619872 B1 WO9619872 B1 WO 9619872B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pick
- track
- position encoder
- digital position
- contacts
- Prior art date
Links
- 125000004122 cyclic group Chemical group 0.000 claims 12
- 230000000875 corresponding Effects 0.000 claims 6
Abstract
An absolute position encoder converts absolute mechanical position to a digital output value. A single-track, rotary embodiment of the encoder includes several conductive pick-up segments (21a, 22a, 23a, 24a, 25a) that are symmetrically arranged along a circular pick-up track, with each pick-up segment connected to a respective output terminal (21, 22, 23, 24, 25). A metallic rotor (27) of the encoder comprises a plurality of contacts (37) that are positioned in alignment with the pick-up track such that the contacts slidably contact different pick-up segments as the rotor is rotated. The contacts on the rotor are conductively interconnected, and are maintained at a common voltage via a sliding connection between the rotor and a collector ring (26a). The output of the encoder is a cyclical Gray code sequence, which may be used in combination with a ROM look-up table to accurately track position. Linear and multi-track embodiments are also disclosed.
Claims
1. An absolute digital position encoder, comprising: a plurality of conductive pick-up segments positioned along a common elongate pick-up track, said pick-up segments electrically insulated from one another, each pick-up segment corresponding to a respective digit of an output code; a moveable member which is movable relative to said plurality of pick-up segments; and a plurality of contacts electrically connected to one another such that said contacts are at a common voltage, each of said plurality of contacts positioned in alignment with said common pick-up track and movable into and out of mechanical contact with at least one of said pick-up segments in response to movement of the moveable member; wherein said pick-up segments, said moveable member and said contacts are arranged such that a sequence of values of said output code generated when said moveable member is moved relative to said pick-up segments is a cyclic Gray code sequence.
2. The absolute digital position encoder according to Claim 1, wherein said moveable member comprises a metallic rotor, and said contacts are provided on said metallic rotor.
3. The absolute digital position encoder according to Claim 1, wherein the number of unique output code values in said cyclic Gray code sequence is at least 30.
4. An absolute digital position encoder, comprising: a plurality of conductive pick-up segments positioned along a common pick-up track, each pick-up segment corresponding to a respective digit of an output code; and a plurality of contacts electrically connected to one another such that said plurality of contacts is at a common voltage, each of said plurality of contacts positioned in alignment with said common pick-up track and moveable into and out of contact with at least two of said pick-up segments, said plurality of contacts moveable with respect to said pick-up segments to define N discrete encoder settings, each discrete encoder setting producing a unique value of said output code.
5. The absolute digital position encoder according to Claim 4, wherein the value of said output code at each of said discrete settings differs in only one digit relative to the value of said output code at discrete encoder settings immediately adjacent thereto.
6. The absolute digital position encoder according to Claim 4, wherein said contacts are provided on a rotary member which is rotatable relative to said pick-up track.
7. The absolute digital position encoder according to Claim 6, wherein said rotary member is rotatable relative to said pick-up track over an operable range of at least 270°.
8. The absolute digital position encoder according to Claim 6, wherein said rotary member is continuously rotatable relative to said pick-up track, and wherein no more than one digit of said output code changes at-a-time when said rotary member is rotated relative to said pick-up track. -19-
9. The absolute digital position encoder according to Claim 4, wherein a sequence of values of said output code corresponding to said N settings is a cyclic Gray code sequence.
10. The absolute digital position encoder according to Claim 4, wherein said contacts are provided on a rotor which is coupled to a shaft.
1 1. The absolute digital position encoder according to Claim 10, wherein said shaft is connected to said rotor such that at least a portion of said rotor is moved away from said pick-up track when an axial force is applied to said shaft to thereby generate a unique output code value which does not correspond to any of said N settings.
12. The absolute digital position encoder according to Claim 4, wherein said pick-up segments comprise respective pads on a printed circuit board.
13. The absolute digital position encoder according to Claim 4, wherein each of said pick-up segments is contiguous along said pick-up track.
14. A single-track absolute digital position encoder, comprising: a first member having a plurality of conductive pick-up segments positioned along a pick-up track, said pick-up segments electrically insulated from one another, each pick-up segment corresponding to a respective digit of an output code of the encoder; a second member supported for relative rotational movement with respect to said first member over an operable range which exceeds 90°; and a plurality of contacts aligned with said pick-up track such that said contacts move into and out of mechanical contact with said pick-up segments to thereby modify said digits of said output code when said first and second members are moved relative to one another; wherein no more than one digit of said output code changes at-a-time when said second member is rotated relative to said first member over said range, and wherein each value of said output code generated over said range uniquely corresponds to a respective relative position of said first and second members.
15. The single-track absolute digital position encoder according to Claim 14, wherein said second member is rotatable continuously relative to said first member, and wherein said output code follows a Gray code sequence through multiple revolutions of said second member relative to said first member.
16. The single-track absolute digital position encoder according to Claim 15, wherein said Gray code sequence is a cyclic Gray code sequence.
17. The single-track absolute digital position encoder according to Claim 14, wherein said contacts are electrically connected together such that all of said contacts are maintained at a common voltage, and wherein each of said digits is a binary digit.
18. The single-track absolute digital position encoder according to Claim 14, wherein each of said digits is a ternary digit. -20-
19. The single-track absolute digital position encoder according to Claim 14, wherein said first member comprises a printed circuit board, and wherein said pick-up segments comprise pads on said printed circuit board.
20. The single-track absolute digital position encoder according to Claim 19, wherein said second member comprises a metallic rotor, and wherein said contacts are provided on said rotor such that said contacts move into and out of sliding contact with said pads when said second member is rotated relative to said first member.
21. The single-track absolute digital position encoder according to Claim 14, wherein each of said pick¬ up segments is contiguous along said pick-up track.
22. The single-track absolute digital position encoder according to Claim 14, wherein each of said contacts moves into and out of contact with each of said pick-up segments when said second member is moved relative to said first member over said range.
23. A single-track absolute digital position encoder, comprising: a first member having a plurality of conductive pick-up segments positioned along a common pick¬ up track, each of said pick-up segments being contiguous along said pick-up track and corresponding to a respective digit of an output code of the encoder; and a second member movably mounted with respect to said first member, said second member comprising a plurality of contacts, each contact positioned on said second member in alignment with said pick-up track such that said contacts move into and out of sliding contact with said pick-up segments when said second member is moved relative to said first member; wherein said pick-up segments and said contacts are arranged such that only one of said contacts moves into or out of contact with any one of said pick-up segments at-a-time when said second member is moved relative to said first member, and such that each value of said output code uniquely represents a respective relative position of said first and second members.
24. The single-track absolute digital position encoder according to Claim 23, wherein said contacts are conductively connected together such that all of said contacts have the same voltage.
25. The single-track absolute digital position encoder according to Claim 23, wherein a first subset of said contacts are maintained at a first voltage and a second subset of said contacts are maintained at a second voltage.
26. The single-track absolute digital position encoder according to Claim 23, wherein said pick-up track is circular.
27. The single-track absolute digital position encoder according to Claim 26, wherein said second member is continuously rotatable relative to said first member, and wherein a sequence of values of said output code generated when said second member is rotated over a range of 360° relative to said first member is a continuous Gray code sequence.
28. The single-track absolute digital position encoder according to Claim 27, wherein said continuous
Gray code sequence is a cyclic Gray code sequence. -21-
29. An absolute digital position encoder, comprising: a first member having a plurality of sensors positioned along a common pick-up track, each of said sensors corresponding to a respective digit of an output code of the encoder; a second member movably mounted with respect to said first member; and a plurality of sensor-detectable elements positioned in alignment with said pick-up track so as to interact with said sensors and thereby modify said digits when said first and second members are moved relative to one another; wherein said sensors, said sensor-detectable elements and said second member are arranged such that a sequence of values of said output code generated when said first member is moved relative to said second member is a cyclic Gray code sequence.
30. The single-track absolute digital position encoder according to Claim 29, wherein said sensors comprise conductive pick-up segments, and wherein said sensor-detectable elements comprise conductive contacts which move into and out of contact with said pick-up segments
31. The single-track absolute digital position encoder according to Claim 29, wherein said conductive contacts slide into and out of contact with said pick-up segments.
32. The single-track absolute digital position encoder according to Claim 29, wherein said pick up track is circular.
33. The single-track absolute digital position encoder according to Claim 29, wherein the number of said sensors is 5, and the number of unique code values in said cyclic Gray code sequence is 30.
34. The single-track absolute digital position encoder according to Claim 29, wherein the number of said sensors is 8, and the number of unique code values in said cyclic Gray code sequence is 128.
35. An absolute digital position encoder, comprising: a first member which generates an output code, said output code comprising a plurality of digits; and a second member movably mounted with respect to said first member such that a sequence of values of said output code generated when said first and second members are moved relative to one another is a cyclic Gray code sequence, and wherein each value of said sequence uniquely corresponds to a respective relative position of said first and second members.
36. The absolute digital position encoder according to Claim 35, wherein said second member is rotatably mounted with respect to said first member.
37. The absolute digital position encoder according to Claim 35, wherein said first member comprises a plurality of sensors which generate said plurality of digits, said sensors positioned along a single pick-up track.
38. The absolute digital position encoder according to Claim 37, wherein the number of said sensors is 5, and the number of unique code values in said cyclic Gray code sequence is 30.
39. The absolute digital position encoder according to Claim 37, wherein the number of said sensors is 8, and the number of unique code values in said cyclic Gray code sequence is 128. -22-
40. The absolute digital position encoder according to Claim 35, wherein the number of unique code values in said cyclic Gray code sequence is at least 30.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP95944421A EP0800725B1 (en) | 1994-12-20 | 1995-12-19 | Digital input and control device |
| AU46473/96A AU4647396A (en) | 1994-12-20 | 1995-12-19 | Digital input and control device |
| JP8520044A JPH10511183A (en) | 1994-12-20 | 1995-12-19 | Digital input and control device |
| DE69511894T DE69511894D1 (en) | 1994-12-20 | 1995-12-19 | DIGITAL INPUT AND CONTROL DEVICE |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/359,703 US5739775A (en) | 1993-07-22 | 1994-12-20 | Digital input and control device |
| US08/359,703 | 1994-12-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1996019872A1 WO1996019872A1 (en) | 1996-06-27 |
| WO1996019872B1 true WO1996019872B1 (en) | 1996-09-06 |
Family
ID=23414936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1995/016972 WO1996019872A1 (en) | 1994-12-20 | 1995-12-19 | Digital input and control device |
Country Status (9)
| Country | Link |
|---|---|
| US (2) | US5739775A (en) |
| EP (1) | EP0800725B1 (en) |
| JP (1) | JPH10511183A (en) |
| AT (1) | ATE184138T1 (en) |
| AU (1) | AU4647396A (en) |
| CA (1) | CA2208325A1 (en) |
| DE (1) | DE69511894D1 (en) |
| MX (1) | MX9704598A (en) |
| WO (1) | WO1996019872A1 (en) |
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-
1994
- 1994-12-20 US US08/359,703 patent/US5739775A/en not_active Expired - Fee Related
-
1995
- 1995-12-19 JP JP8520044A patent/JPH10511183A/en active Pending
- 1995-12-19 AU AU46473/96A patent/AU4647396A/en not_active Abandoned
- 1995-12-19 WO PCT/US1995/016972 patent/WO1996019872A1/en active IP Right Grant
- 1995-12-19 CA CA002208325A patent/CA2208325A1/en not_active Abandoned
- 1995-12-19 DE DE69511894T patent/DE69511894D1/en not_active Expired - Lifetime
- 1995-12-19 EP EP95944421A patent/EP0800725B1/en not_active Expired - Lifetime
- 1995-12-19 AT AT95944421T patent/ATE184138T1/en not_active IP Right Cessation
-
1997
- 1997-01-29 US US08/788,453 patent/US5751230A/en not_active Expired - Fee Related
- 1997-06-19 MX MX9704598A patent/MX9704598A/en not_active IP Right Cessation
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