US5289264A
Expired / Lapsed
US
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Method and apparatus for ascertaining the absolute coordinates of an object
Assignee: Individual
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Filing: 1992-09-25
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Granted: 1994-02-22
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Expires: 2012-09-25
Abstract
Abstract An apparatus is used for ascertaining the absolute coordinates of an object (1). Said apparatus includes a light source (6), projection optics, in particular a projection objective (7), a projection grating (2) which is projected onto the object (1) through the projection optics (7) to form an image, a sensor (5) for receiving the light (4) reflected from the object (1), and an objective (8) projecting the light (4) reflected from the object (1) onto the sensor (5). In order to enable the simple determination of the absolute coordinates of the object (1), the projection grating (2) and/or the sensor (5) are rotatable. There is provided an evaluation unit which evaluates the signals (shots or pictures) of the sensor (5) at least two different angle positions of the projection grating (2) or of the sensor (5) and determines the absolute coordinates of the object (1) therefrom.
Inventors
- 👤 Hans Steinbichler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:03
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/24; G01B11/25; G01B11/254
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
100 words
A method for ascertaining the absolute coordinates of an object wherein the object is irradiated with light through a projection grating, wherein the light reflected from the object is received by a sensor, and wherein the signal from the sensor is evaluated, comprising the steps of positioning first the projection grating and the sensor to provide a first image-formation, evaluating said first image formation, rotating the projection grating and the sensor relative to each other through a predetermined angle to provide a second image-formation, evaluating said second image formulation, and establishing the absolute coordinates of the object through said evaluations.
Claim 2
Independent Claim
100 words
A method for ascertaining the absolute coordinates of an object wherein the object is irradiated with light through a projection grating, wherein the light reflected from the object is received by a sensor, and wherein the signal from the sensor is evaluated, comprising the steps of positioning first the projection grating and the sensor to provide a first image-formation, evaluating said first image formation, rotating the projection grating and the sensor relative to each other through a predetermined angle to provide a second image-formation, evaluating said second image formulation, and establishing the absolute coordinates of the object through said evaluations.
Claim 3
Dependent Claim
16 words
A method according to claim 1, wherein the projection grating is rotated through a predetermined angle.
Claim 4
Dependent Claim
98 words
A method according to claim 1 comprising the further step of evaluating said first and second image formation according to the formula ##EQU2## wherein I=intensity at one point of the sensor, r=radius, i.e., spacing of the point at the projection grating from a reference point of the projection grating, preferably of the point of rotation of the projection grating, phi=angle of rotation of the projection grating between the first and the second evaluation. phi o =angle of the point at the projection grating to a reference line, a=background brightness b=contrast g=grating constant of the projection grating ∝=phase constant.
Claim 5
Dependent Claim
18 words
A method according to claim 1 wherein the evaluations are carried out according to a phase shift method.
Claim 6
Dependent Claim
17 words
A method according to claim 1 wherein the evaluations are carried out according to a Fourier transformation.
Claim 7
Dependent Claim
22 words
A method according to claim 1 wherein the evaluations are carried out with images displaced in phase which are read in simultaneously.
Claim 8
Independent Claim
128 words
A method for ascertaining the absolute coordinates of an object, wherein the object is irradiated with light through a projection grating, wherein the light reflected from the object is received by a sensor and wherein the signal from the sensor is evaluated, comprising the steps of irradiating the object with light of a first color through a first projection grating, irradiating the object with light of a second color through a second projection grating rotating the second projection grating through a predetermined angle with respect to the first projection grating, receiving the light reflected from the object is received by sensor means sensitive to said two colors, evaluating the signals from the sensor means, and ascertaining the absolute coordinates of the object on the basis of said evaluations.
Claim 9
Independent Claim
128 words
A method for ascertaining the absolute coordinates of an object, wherein the object is irradiated with light through a projection grating, wherein the light reflected from the object is received by a sensor and wherein the signal from the sensor is evaluated, comprising the steps of irradiating the object with light of a first color through a first projection grating, irradiating the object with light of a second color through a second projection grating rotating the second projection grating through a predetermined angle with respect to the first projection grating, receiving the light reflected from the object is received by sensor means sensitive to said two colors, evaluating the signals from the sensor means, and ascertaining the absolute coordinates of the object on the basis of said evaluations.
Claim 10
Dependent Claim
95 words
A method according to claim 7 comprising the further steps of evaluation said sensor means signals according to the formula ##EQU3## wherein I=intensity at one point of the sensor r=radius, i.e., spacing of the point at the projection grating from a reference point of the projection grating preferably of the point of rotation of the projection grating phi=angle of rotation of the projection grating between the sensor means signals evaluation phi o =angle of the point at the projection grating to a reference line a=background brightness b=contrast g=grating constant of the projection grating ∝=phase constant
Claim 11
Dependent Claim
18 words
A method according to claim 7 wherein the evaluations are carried out according to a phase shift method.
Claim 12
Dependent Claim
17 words
A method according to claim 7 wherein the evaluations are carried out according to a Fourier transformation.
Claim 13
Dependent Claim
22 words
A method according to claim 7 wherein the evaluations are carried out with images displaced in phase which are read in simultaneously.
Claim 14
Independent Claim
124 words
An apparatus for ascertaining the absolute coordinates of an object comprising a light source, a projection optics, in particular a projection objective, a projection grating an image of which is formed on the object by means of the projection optics, a sensor for receiving the light reflected from the object and for generating a signal in response thereto, and an object which projects the light reflected from the object to form an image on the sensor, wherein the projection grating and the sensor can be rotated relative to each other, and an evaluation unit to evaluate the sensor signal at the least two different rotation angle positions of the projection grating and the sensor and which determines the absolute coordinates of the object therefrom.
Claim 15
Independent Claim
124 words
An apparatus for ascertaining the absolute coordinates of an object comprising a light source, a projection optics, in particular a projection objective, a projection grating an image of which is formed on the object by means of the projection optics, a sensor for receiving the light reflected from the object and for generating a signal in response thereto, and an object which projects the light reflected from the object to form an image on the sensor, wherein the projection grating and the sensor can be rotated relative to each other, and an evaluation unit to evaluate the sensor signal at the least two different rotation angle positions of the projection grating and the sensor and which determines the absolute coordinates of the object therefrom.
Claim 16
Dependent Claim
13 words
An apparatus according to claim 12, wherein the projection grating can be rotated.
Claim 17
Independent Claim
131 words
An apparatus for ascertaining the absolute coordinates of an object comprising, a light source, projection optics, including, a projection objective, a projection grating, an image of which is formed on the object by means of the projection optics, a sensor for receiving the light reflected from the object, and an objective which projects the light reflected from the object to form an image on the sensor, a first projection grating for light of a first color, a second projection grating for light of a second color, which is rotated through a certain angle relative to the first projection grating, sensor means sensitive to said two colors for producing signal in response thereto, and an evaluation unit for evaluating the sensor means signal and determining therefrom the absolute coordinates of the object.
Claim 18
Independent Claim
131 words
An apparatus for ascertaining the absolute coordinates of an object comprising, a light source, projection optics, including, a projection objective, a projection grating, an image of which is formed on the object by means of the projection optics, a sensor for receiving the light reflected from the object, and an objective which projects the light reflected from the object to form an image on the sensor, a first projection grating for light of a first color, a second projection grating for light of a second color, which is rotated through a certain angle relative to the first projection grating, sensor means sensitive to said two colors for producing signal in response thereto, and an evaluation unit for evaluating the sensor means signal and determining therefrom the absolute coordinates of the object.
Claim 19
Dependent Claim
23 words
Apparatus according to claim 14 wherein the evaluations are carried out according to the formula ##EQU4## and derivatives of said formula derived therefrom.
Claim 20
Dependent Claim
26 words
An apparatus according to claim 12 or 14 wherein the evaluations are carried out according to the formula ##EQU5## and derivatives of said formula derived therefrom.
Claim 21
Dependent Claim
20 words
An apparatus according to claim 12 or claim 14 wherein the evaluations are performed according to a phase shift method.
Claim 22
Dependent Claim
19 words
An apparatus according to claim 12 or claim 14 wherein the evaluations are performed according to a Fourier transformation.
Claim 23
Dependent Claim
23 words
An apparatus according to claim 12 or claim 14 wherein the evaluations are carried out with phase-shifted images which are read in simultaneously.
Claim 24
Dependent Claim
31 words
An apparatus according to claim 12 or claim 14 further comprising a reference grating through which the light reflected from the object is projected onto the sensor to form an image.
Claim 25
Dependent Claim
19 words
An apparatus according to claim 20, wherein the reference grating formed by the sensor, further comprises a CCD sensor.
Claim 26
Dependent Claim
21 words
An apparatus according to claim 12 or claim 14 wherein the main planes of the objectives lie in the same plane.
Claim 27
Dependent Claim
21 words
An apparatus according to claim 12 or claim 14 wherein the focal lengths of the objectives are of the same size.
Claim 28
Dependent Claim
21 words
An apparatus according to claim 12 or claim 14 wherein the projection grating is provided with a sinusoidal or ramp-like transparency.
Claim 29
Dependent Claim
25 words
An apparatus according to claim 12 or claim 14 wherein the grating constant and the transparency of the projection grating can be adjusted and rotated.
Claim 30
Dependent Claim
18 words
An apparatus according to claim 12 or claim 14 wherein the projection grating further comprises an LCD display.
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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) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |