US5235406A
Expired / Lapsed
US
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Object displacement detection
Assignee: Canon Inc
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Filing: 1991-06-18
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Granted: 1993-08-10
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Expires: 2011-06-18
Abstract
Abstract This invention relates to signal processing for enhancing detection resolving power on the basis of a periodic signal obtained in a displacement detecting device such as an encoder or a laser length measuring machine, and on the basis of input sine wave and cosine wave signals which are the references, a sine wave signal and a cosine wave signal of a frequency integer times as high as the frequency of the reference signals are produced by calculation by the use of adders, multipliers, etc.
Inventors
- 👤 Satoshi Ishii
- 👤 Tadashi Eguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:43
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/244; G01D5/24404; G01D5/26; G01D5/32; G01D5/34; G01D5/36; G01D5/38
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
114 words
A method of monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; effecting a multiplying process for producing second sine wave and cosine wave signals, each having higher frequency that each of the first sine wave and cosine wave signals, and which correspond to the displacement of the object as a result of using the first sine wave and cosine wave signals to produce the second sine and cosine wave signals; and producing a signal representing the displacement of the object by using the second sine wave and cosine wave signals.
Claim 2
Independent Claim
114 words
A method of monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; effecting a multiplying process for producing second sine wave and cosine wave signals, each having higher frequency that each of the first sine wave and cosine wave signals, and which correspond to the displacement of the object as a result of using the first sine wave and cosine wave signals to produce the second sine and cosine wave signals; and producing a signal representing the displacement of the object by using the second sine wave and cosine wave signals.
Claim 3
Independent Claim
125 words
An apparatus for monitoring a displacement of an object, comprising: detecting means for detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means effecting a multiplying process for producing second sine wave and cosine wave signals, each having a higher frequency than each of the first sine wave and cosine wave signals, respectively, and corresponding to the displacement of the object as a result of use of the first sine wave and cosine wave signals to produce the second sine and cosine wave signals.
Claim 4
Independent Claim
125 words
An apparatus for monitoring a displacement of an object, comprising: detecting means for detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means effecting a multiplying process for producing second sine wave and cosine wave signals, each having a higher frequency than each of the first sine wave and cosine wave signals, respectively, and corresponding to the displacement of the object as a result of use of the first sine wave and cosine wave signals to produce the second sine and cosine wave signals.
Claim 5
Dependent Claim
45 words
A signal processing apparatus according to claim 2, further having compensation means for compensating for an error component by any deviation which may be present in the amplitude of and/or the phase difference between the sine wave and cosine wave signals which are the references.
Claim 6
Dependent Claim
168 words
A displacement detecting device comprising: detecting means for detecting displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means including a first multiplier for effecting a multiplying process for producing a second sine wave signal having higher frequency than that of the first sine wave signal and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, and a second multiplier for effecting a multiplying process for producing a second cosine wave signal having higher frequency than that of the first cosine wave signal and corresponding to the displacement of the object, by using at least the first sine wave signal, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals.
Claim 7
Dependent Claim
168 words
A displacement detecting device comprising: detecting means for detecting displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means including a first multiplier for effecting a multiplying process for producing a second sine wave signal having higher frequency than that of the first sine wave signal and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, and a second multiplier for effecting a multiplying process for producing a second cosine wave signal having higher frequency than that of the first cosine wave signal and corresponding to the displacement of the object, by using at least the first sine wave signal, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals.
Claim 8
Dependent Claim
45 words
A displacement detecting device according to claim 4, further having compensation means for compensating for an error component by any deviation which may be present in the amplitude of and/or the phase difference between said sine wave and cosine wave signals which are the references.
Claim 9
Dependent Claim
15 words
A displacement detecting device according to claim 4, wherein said detecting means has an encoder.
Claim 10
Dependent Claim
20 words
A displacement detecting device according to claim 4, wherein said detecting means has means for optically detecting the displaced state.
Claim 11
Dependent Claim
25 words
A displacement detecting device according to claim 7, wherein said detecting means has means for detecting the displaced state by the utilization of light interference.
Claim 12
Dependent Claim
193 words
A driving system comprising: driving means for driving an object; detecting means for detecting a displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means including a first multiplier for effecting a multiplying process for producing a second sine wave signal having higher frequency than that of the first sine wave signal and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, and a second multiplier for effecting a multiplying process for producing a second cosine wave signal having higher frequency than that of the first cosine wave signal and corresponding to the displacement of the object, by using at least the first sine wave signal, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals, and wherein said drive means drives the object in accordance with the signal representing the displacement of the object.
Claim 13
Dependent Claim
193 words
A driving system comprising: driving means for driving an object; detecting means for detecting a displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means including a first multiplier for effecting a multiplying process for producing a second sine wave signal having higher frequency than that of the first sine wave signal and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, and a second multiplier for effecting a multiplying process for producing a second cosine wave signal having higher frequency than that of the first cosine wave signal and corresponding to the displacement of the object, by using at least the first sine wave signal, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals, and wherein said drive means drives the object in accordance with the signal representing the displacement of the object.
Claim 14
Dependent Claim
44 words
A driving system according to claim 9, further having compensation means for compensating for an error component by any deviation which may be present in the amplitudes of and/or the phase difference between said sine wave and cosine wave signals which are the references.
Claim 15
Dependent Claim
14 words
A driving system according to claim 9, wherein said detecting means has an encoder.
Claim 16
Independent Claim
102 words
A method of monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and effecting a multiplying process to produce second sine wave and cosine wave signals, each having a higher frequency than each of the first sine wave and cosine wave signals, and corresponding to the displacement of the object by using the first sine wave and cosine wave signals, wherein the displacement of the object is represented by means of the second sine wave and cosine wave signals.
Claim 17
Independent Claim
102 words
A method of monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and effecting a multiplying process to produce second sine wave and cosine wave signals, each having a higher frequency than each of the first sine wave and cosine wave signals, and corresponding to the displacement of the object by using the first sine wave and cosine wave signals, wherein the displacement of the object is represented by means of the second sine wave and cosine wave signals.
Claim 18
Independent Claim
132 words
An apparatus for detecting a displacement of an object, comprising: detecting means for detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave an cosine wave signals, said signal producing means effecting a multiplying process for producing second sine wave and cosine wave signals, each having a higher frequency than each of the first sine wave and cosine wave signals, and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals.
Claim 19
Independent Claim
132 words
An apparatus for detecting a displacement of an object, comprising: detecting means for detecting the displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave an cosine wave signals, said signal producing means effecting a multiplying process for producing second sine wave and cosine wave signals, each having a higher frequency than each of the first sine wave and cosine wave signals, and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals.
Claim 20
Dependent Claim
195 words
A driving system for driving an object, comprising: driving means for driving an object; detecting means for detecting a displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means including a first multiplier for effecting a multiplying process for producing a second sine wave signal having higher frequency than that of the first sine wave signal and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, and a second multiplier for effecting a multiplying process for producing a second cosine wave signal having a higher frequency than that of the first cosine wave signal and corresponding to the displacement of the object, by using at least the first sine wave signal, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals, and wherein said drive means drives the object in accordance with the signal representing the displacement.
Claim 21
Dependent Claim
195 words
A driving system for driving an object, comprising: driving means for driving an object; detecting means for detecting a displacement of the object and producing first sine wave and cosine wave signals corresponding to the displacement of the object; and signal producing means for producing a signal representing the displacement of the object in response to the first sine wave and cosine wave signals, said signal producing means including a first multiplier for effecting a multiplying process for producing a second sine wave signal having higher frequency than that of the first sine wave signal and corresponding to the displacement of the object, by using the first sine wave and cosine wave signals, and a second multiplier for effecting a multiplying process for producing a second cosine wave signal having a higher frequency than that of the first cosine wave signal and corresponding to the displacement of the object, by using at least the first sine wave signal, wherein the signal representing the displacement of the object is produced by using the second sine wave and cosine wave signals, and wherein said drive means drives the object in accordance with the signal representing the displacement.
Claim 22
Independent Claim
110 words
A method of monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing a first and second sine-like wave signals, having a phase difference with each other and corresponding to the displacement of the object; effecting a multiplying process by using the first and second sine wave-like signals to produce third and fourth sine wave-like signals, each having a higher frequency than each of the first and second sine wave-like signals and having a phase difference with each other and corresponding to the displacement of the object; and determining the displacement of the object from the third and fourth sine wave-like signals.
Claim 23
Independent Claim
110 words
A method of monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing a first and second sine-like wave signals, having a phase difference with each other and corresponding to the displacement of the object; effecting a multiplying process by using the first and second sine wave-like signals to produce third and fourth sine wave-like signals, each having a higher frequency than each of the first and second sine wave-like signals and having a phase difference with each other and corresponding to the displacement of the object; and determining the displacement of the object from the third and fourth sine wave-like signals.
Claim 24
Independent Claim
83 words
A method for monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing a first sine-like wave signal corresponding to the displacement of the object; effecting a multiplying process by using the first sine-like wave signal to produce a second sine-like wave signal having higher frequency than that of the first sine-like wave signal and corresponding to the displacement of the object; and determining the displacement of the object from the second sine-like wave signal.
Claim 25
Independent Claim
83 words
A method for monitoring a displacement of an object, comprising the steps of: detecting the displacement of the object and producing a first sine-like wave signal corresponding to the displacement of the object; effecting a multiplying process by using the first sine-like wave signal to produce a second sine-like wave signal having higher frequency than that of the first sine-like wave signal and corresponding to the displacement of the object; and determining the displacement of the object from the second sine-like wave signal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |