EP0435429A1
Expired / Lapsed
EP
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Method and apparatus for simultaneous sensing of angular and axial position
Assignee: Mitutoyo Corp
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Filing: 1990-10-05
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Granted: —
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Expires: 2010-10-05
Abstract
Abstract A method and apparatus for sensing both axial and angular displacements of a collar relative to a shaft. The invention provides transmitting and receiving electrodes on the shaft and coupling electrodes on the collar. Displacements in the axial or angular directions vary the amount of signal conveyed between the electrodes relative to the quantities sought to be measured. An electronic package provides the appropriate signals and allows multiplexing of the data.
Inventors
- 👤 Ingvar Andermo
- 👤 Victor E. Belmondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 08:04
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/24; G01D5/241; G01D5/2412; G01D5/2415
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
85 words
A method for sensing the longitudinal and angular position of two parts relative to each other by: generating an alternating current signal, and transmitting said signal to a first set of electrodes attached to the first part, and conveying said signal by capacitive coupling to a second set of electrodes attached to the second part, and amplifying said signal received on and, processing said received signal to extract information on both relative position of said first and second part including both angular and longitudinal displacement.
Claim 2
Independent Claim
85 words
A method for sensing the longitudinal and angular position of two parts relative to each other by: generating an alternating current signal, and transmitting said signal to a first set of electrodes attached to the first part, and conveying said signal by capacitive coupling to a second set of electrodes attached to the second part, and amplifying said signal received on and, processing said received signal to extract information on both relative position of said first and second part including both angular and longitudinal displacement.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein, said first set of electrodes are substantially triangular in shape.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein one set of electrodes are substantially rectangular in shape. The method of claim 1 wherein at least one of said sets of electrodes is sinsodial in shape.
Claim 5
Dependent Claim
30 words
The method of claim 1, comprising the further steps of; switching said signal between separate electrodes to allow sensing of at least two separate functions, and decoding the signal received.
Claim 6
Dependent Claim
15 words
The method of claim 4, wherein the two functions sensed are axial and angular position.
Claim 7
Dependent Claim
26 words
The method of claim 5, wherein said switching step is accomplished by imposing signals that differ from one another by phase on each set of electrodes.
Claim 8
Independent Claim
33 words
A method for sensing the longitudinal and angular position of two parts relative to each other by: sensing the longitudinal position by electrical means, and, further sensing the angular position by electrical means.
Claim 9
Independent Claim
33 words
A method for sensing the longitudinal and angular position of two parts relative to each other by: sensing the longitudinal position by electrical means, and, further sensing the angular position by electrical means.
Claim 10
Dependent Claim
41 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 7, wherein said electrical means includes the further step of sensing the capacitance between at least one electrode attached to each part.
Claim 11
Dependent Claim
50 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 8, wherein said electrical means further includes means for generating a signal for application to at least one electrode and means for detecting said signal on at least one additional electrode.
Claim 12
Dependent Claim
50 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 9, wherein said means for generating a signal includes means for applying at least two signals and said means for receiving said signals includes means for separating the two signals received.
Claim 13
Dependent Claim
44 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 10, wherein one of said signals is adapted for detection of longitudinal position and one of said signals is adapted for detection of angular displacements.
Claim 14
Dependent Claim
26 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 10, wherein said signals differ in phase.
Claim 15
Dependent Claim
32 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 12, wherein said signals are 90 degrees out of phase with each other.
Claim 16
Dependent Claim
43 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 12 wherein there are alt least three sets of transmitting electrodes supplied with signals that are 120 degrees shifted in phase from each other.
Claim 17
Dependent Claim
30 words
A method for sensing the longitudinal and angular position of two parts relative to each other as in claim 12 wherein the electrodes on each part are sinsoidial in shape.
Claim 18
Independent Claim
85 words
An apparatus for sensing the relative position of two parts comprising: generating means for producing a alternating current signal; and, a first set of electrodes attached to but insulated from said first part for transmitting said signal; and, a second set of electrodes attached to but insulated from said second part for receiving said signal; and, analyzing means connected to said second set of electrodes for measuring the relative amount of signal transmitted from said first set of electrodes to said second set of electrodes.
Claim 19
Independent Claim
85 words
An apparatus for sensing the relative position of two parts comprising: generating means for producing a alternating current signal; and, a first set of electrodes attached to but insulated from said first part for transmitting said signal; and, a second set of electrodes attached to but insulated from said second part for receiving said signal; and, analyzing means connected to said second set of electrodes for measuring the relative amount of signal transmitted from said first set of electrodes to said second set of electrodes.
Claim 20
Dependent Claim
25 words
An apparatus for sensing the relative position of two parts as in claim 16 wherein said first set of electrodes are substantially triangular in shape.
Claim 21
Dependent Claim
25 words
An apparatus for sensing the relative position of two parts as in claim 17 wherein said second set of electrodes are substantially rectangular in shape.
Claim 22
Dependent Claim
40 words
An apparatus for sensing the relative position of two parts as in claim 16 further comprising; a third set of electrodes attached to but insulated from said first part for receiving said signal retransmitted from said second set of electrodes.
Claim 23
Independent Claim
63 words
An apparatus for sensing the relative position of two parts comprising: generation means for producing a alternating current signal; and, a first set of electrodes attached to said generation means for transmitting said signal; and, detecting means for detecting the signal transmitted by said first set of electrodes; and, a second set of electrodes attached to said detecting means for receiving said signal.
Claim 24
Independent Claim
63 words
An apparatus for sensing the relative position of two parts comprising: generation means for producing a alternating current signal; and, a first set of electrodes attached to said generation means for transmitting said signal; and, detecting means for detecting the signal transmitted by said first set of electrodes; and, a second set of electrodes attached to said detecting means for receiving said signal.
Claim 25
Dependent Claim
26 words
An apparatus for sensing the relative position of two parts as in claim 20 wherein said generation means is capable of generating at least two signals.
Claim 26
Dependent Claim
20 words
An apparatus for sensing the relative position of two parts as in claim 21 wherein said signals differ in phase.
Claim 27
Dependent Claim
22 words
An apparatus for sensing the relative position of two parts as in claim 22 wherein said signals differ 90 degrees in phase.
Claim 28
Dependent Claim
29 words
An apparatus for sensing the relative position of two parts as in claim 22 wherein there are three of said signals differing 120 degrees in phase from each other.
Claim 29
Dependent Claim
26 words
An apparatus for sensing the relative position of two parts as in claim 21 wherein at least one set of transmitting electrodes width varies with length.
Claim 30
Dependent Claim
31 words
An apparatus for sensing the relative position of two parts as in claim 21 wherein at least one set of transmitting electrodes width varies with length according to the sine function.
Claim 31
Dependent Claim
57 words
An apparatus for sensing the relative position of two parts as in claim 23 wherein there are at least two sets of transmitting electrodes and one set of electrodes receives the first of said signals generated by said generating means and the second set of electrodes receives the second set of signals generated by said generating means.
Claim 32
Dependent Claim
40 words
An apparatus for sensing the relative position of two parts as in claim 24 further comprising phase separation means connected to said receiving electrodes for separating the signals generated by said generating means after their reception by said receiving electrodes.
References Cited (Backward Citations)
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