CA3109997A1 - Method for determining the curvature of a glass pane, more particularly a windshield - Google Patents
Method for determining the curvature of a glass pane, more particularly a windshield Download PDFInfo
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- CA3109997A1 CA3109997A1 CA3109997A CA3109997A CA3109997A1 CA 3109997 A1 CA3109997 A1 CA 3109997A1 CA 3109997 A CA3109997 A CA 3109997A CA 3109997 A CA3109997 A CA 3109997A CA 3109997 A1 CA3109997 A1 CA 3109997A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
- G01B11/2518—Projection by scanning of the object
- G01B11/2522—Projection by scanning of the object the position of the object changing and being recorded
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
- G01B11/255—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures for measuring radius of curvature
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- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The subject matter of the invention is a method for determining the curvature of at least one glass pane (7, 8, 9), using at least three triangulation sensors (3, 17, 18), which in a transverse direction (2) have different positions, comprising an inner triangulation sensor (17) and at least two outer triangulation sensors arranged in the transverse direction (2) outside the inner triangulation sensor (17), wherein the outer triangulation sensors (18) record position data of at least two positions in the transverse direction (2). This can be done for example by moving the outer triangulation sensors (18) in the transverse direction (2) or by increasing the number of outer triangulation sensors (18), or also by arranging triangulation sensors (17, 18) that simultaneously record data of several positions in the transverse direction (2).
Description
Method for determining the curvature of a glass pane, more particularly a windshield The present invention relates to a method for determining the curvature of a glass pane, to a method for determining the curvature of a windshield and to a method for monitoring the production process of a windshield by means of one of the aforementioned methods.
Glass panes, in particular windshields, are manufactured industrially, for example by means of a gravity-driven molding method in which a corresponding blank is heated and, when heated, is placed in a mold under gravity, or by means of a method in which one or more heated blanks are formed by means of a pressing method. Windshields in particular are being used more and more for other functions in addition to their original function of protecting the passengers of a motor vehicle from the head wind. For example, the use of a heads-up display in which information is projected into the windshield and can be seen by the driver through a corresponding reflection is known. Windshields are also used to fasten sensors, in particular cameras. This results in high optical quality requirements with regard to the transmission or reflection of light. In addition to the parity of the glass, in particular with regard to encapsulations or the like, the shape of the windshield in particular is of great importance for meeting these high requirements. Determining the curvature of a windshield is therefore becoming increasingly important.
For this purpose, it is known from the prior art to use three triangulation sensors designed as point sensors to record curvature data on three lines along the windshield.
The term "point sensor" is understood to mean that, in principle, data from a point on the windshield is recorded. The data from a line on the windshield are recorded by means of a relative movement between the point sensor and the windshield. In principle, the triangulation sensor determines a distance which, by means of a calibration, for example of the position of the triangulation sensor relative to a plane on which the windshield lies, provides a position data curve from which the curvature of the windshield can be determined in this region.
Due to the steadily increasing requirements for the precision of the curvature of the windshield, the data obtained in this way no longer meet specific requirements.
Based on the disadvantages known from the prior art, the problem addressed by the present invention is therefore that of providing an improved method for determining the curvature of a glass pane.
Date Recue/Date Received 2021-02-18 This problem is solved by means of the features of the independent claim.
Dependent claims are directed to advantageous developments. It should be noted that the features listed individually in the dependent claims can be combined with one another in any technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are described and explained in more detail in the description, further preferred embodiments of the invention being thereby shown.
The method according to the invention for determining the curvature of at least one glass pane, in which the at least one glass pane and a sensor device can be moved relative to one another in a movement direction and the sensor device has at least three triangulation sensors, each of which has a light emission unit, which emits light onto the at least one glass pane, and has a light detection unit, which detects the light scattered by the at least one glass pane, such that the triangulation sensors record position data from the at least one glass pane which cover the at least one glass pane in the movement direction, the triangulation sensors having different positions in a transverse direction transverse to the movement direction, with an inner triangulation sensor and at least two outer triangulation sensors provided in the transverse direction outside the inner triangulation sensor, is characterized in that the outer triangulation sensors record position data from at least two positions in the transverse direction.
The method according to the invention is used in particular on individual glass panes, which are referred to as singlets, but also on a plurality of glass panes which, for example, lie one inside the other. In particular, two glass panes lying one inside the other are referred to as a doublet. Windshields in particular are regularly produced from a plurality of glass panes that are connected to one another. As part of the production process, such glass panes are regularly separated by a powder layer, but are molded together and then subjected to the further production process in which they are connected to one another. There are also so-called laminated windshields, in which two or more singlets are connected to one another.
In principle, a film between the panes or on one of the panes is formed between two glass panes to form a windshield before or during the connection of said panes. On the one hand, this results in a separation of the panes, and on the other hand, further functionalities such as splinter protection can be implemented in this way.
A triangulation sensor is understood to be a laser-based distance sensor that measures distances to a reference without contact and with high accuracy. The light emission unit, a laser source, projects a laser beam onto the measurement object and the scattered light is
Glass panes, in particular windshields, are manufactured industrially, for example by means of a gravity-driven molding method in which a corresponding blank is heated and, when heated, is placed in a mold under gravity, or by means of a method in which one or more heated blanks are formed by means of a pressing method. Windshields in particular are being used more and more for other functions in addition to their original function of protecting the passengers of a motor vehicle from the head wind. For example, the use of a heads-up display in which information is projected into the windshield and can be seen by the driver through a corresponding reflection is known. Windshields are also used to fasten sensors, in particular cameras. This results in high optical quality requirements with regard to the transmission or reflection of light. In addition to the parity of the glass, in particular with regard to encapsulations or the like, the shape of the windshield in particular is of great importance for meeting these high requirements. Determining the curvature of a windshield is therefore becoming increasingly important.
For this purpose, it is known from the prior art to use three triangulation sensors designed as point sensors to record curvature data on three lines along the windshield.
The term "point sensor" is understood to mean that, in principle, data from a point on the windshield is recorded. The data from a line on the windshield are recorded by means of a relative movement between the point sensor and the windshield. In principle, the triangulation sensor determines a distance which, by means of a calibration, for example of the position of the triangulation sensor relative to a plane on which the windshield lies, provides a position data curve from which the curvature of the windshield can be determined in this region.
Due to the steadily increasing requirements for the precision of the curvature of the windshield, the data obtained in this way no longer meet specific requirements.
Based on the disadvantages known from the prior art, the problem addressed by the present invention is therefore that of providing an improved method for determining the curvature of a glass pane.
Date Recue/Date Received 2021-02-18 This problem is solved by means of the features of the independent claim.
Dependent claims are directed to advantageous developments. It should be noted that the features listed individually in the dependent claims can be combined with one another in any technologically meaningful manner and define further embodiments of the invention. In addition, the features specified in the claims are described and explained in more detail in the description, further preferred embodiments of the invention being thereby shown.
The method according to the invention for determining the curvature of at least one glass pane, in which the at least one glass pane and a sensor device can be moved relative to one another in a movement direction and the sensor device has at least three triangulation sensors, each of which has a light emission unit, which emits light onto the at least one glass pane, and has a light detection unit, which detects the light scattered by the at least one glass pane, such that the triangulation sensors record position data from the at least one glass pane which cover the at least one glass pane in the movement direction, the triangulation sensors having different positions in a transverse direction transverse to the movement direction, with an inner triangulation sensor and at least two outer triangulation sensors provided in the transverse direction outside the inner triangulation sensor, is characterized in that the outer triangulation sensors record position data from at least two positions in the transverse direction.
The method according to the invention is used in particular on individual glass panes, which are referred to as singlets, but also on a plurality of glass panes which, for example, lie one inside the other. In particular, two glass panes lying one inside the other are referred to as a doublet. Windshields in particular are regularly produced from a plurality of glass panes that are connected to one another. As part of the production process, such glass panes are regularly separated by a powder layer, but are molded together and then subjected to the further production process in which they are connected to one another. There are also so-called laminated windshields, in which two or more singlets are connected to one another.
In principle, a film between the panes or on one of the panes is formed between two glass panes to form a windshield before or during the connection of said panes. On the one hand, this results in a separation of the panes, and on the other hand, further functionalities such as splinter protection can be implemented in this way.
A triangulation sensor is understood to be a laser-based distance sensor that measures distances to a reference without contact and with high accuracy. The light emission unit, a laser source, projects a laser beam onto the measurement object and the scattered light is
- 2 -Date Recue/Date Received 2021-02-18 imaged at an oblique viewing angle by the light receiver unit, which usually contains a correspondingly designed light-sensitive chip, such as a CCD chip. By correspondingly evaluating the measurement signals obtained, position data are obtained which precisely represent the distance between a scattering interface or a scattering object and the reference. If a specific interface is assessed, it is also possible to measure thicknesses. The corresponding thickness is therefore determined as the difference between two distances.
The measurement provides position data which allow a curvature of the glass pane to be determined at the position of the corresponding triangulation sensor in the transverse direction. For each position (in the transverse direction) of a triangulation sensor, a data set is thus obtained which two-dimensionally represents the distance between the particular interface and a position in the movement direction. In this way, the contour of the glass pane in the movement direction can be determined at the position in the transverse direction.
According to the invention, the outer triangulation sensors each record position data from at least two positions in the transverse direction. As a result, the glass pane can consequently be measured more precisely than in methods known from the prior art. This can be achieved in a simple manner. For example, at least the outer triangulation sensors can be moved in the transverse direction, for example position data can be recorded at three specific positions in the transverse direction, advantageously over the entire length of the glass pane in the movement direction, whereupon at least the outer triangulation sensors (or the entire sensor device) are shifted in the transverse direction, followed by a new recording of position data in the longitudinal direction. Alternatively or in addition, it is possible to provide more than one triangulation sensor, for example two or three, instead of one outer triangulation sensor. Alternatively or additionally, at least one of the triangulation sensors can be designed as a line sensor that records data over a specific length in the transverse direction.
Embodiments are preferred which comprise an inner triangulation sensor configured as a point sensor and two or three outer triangulation sensors each configured as point sensors.
Also preferred is an embodiment which comprises an inner triangulation sensor configured as a point sensor or line sensor and outer triangulation sensors configured as a line sensor.
At least one of the following triangulation sensors:
a) the inner triangulation sensor; and b) at least one of the outer triangulation sensors preferably records position data from only one position in the transverse direction.
The measurement provides position data which allow a curvature of the glass pane to be determined at the position of the corresponding triangulation sensor in the transverse direction. For each position (in the transverse direction) of a triangulation sensor, a data set is thus obtained which two-dimensionally represents the distance between the particular interface and a position in the movement direction. In this way, the contour of the glass pane in the movement direction can be determined at the position in the transverse direction.
According to the invention, the outer triangulation sensors each record position data from at least two positions in the transverse direction. As a result, the glass pane can consequently be measured more precisely than in methods known from the prior art. This can be achieved in a simple manner. For example, at least the outer triangulation sensors can be moved in the transverse direction, for example position data can be recorded at three specific positions in the transverse direction, advantageously over the entire length of the glass pane in the movement direction, whereupon at least the outer triangulation sensors (or the entire sensor device) are shifted in the transverse direction, followed by a new recording of position data in the longitudinal direction. Alternatively or in addition, it is possible to provide more than one triangulation sensor, for example two or three, instead of one outer triangulation sensor. Alternatively or additionally, at least one of the triangulation sensors can be designed as a line sensor that records data over a specific length in the transverse direction.
Embodiments are preferred which comprise an inner triangulation sensor configured as a point sensor and two or three outer triangulation sensors each configured as point sensors.
Also preferred is an embodiment which comprises an inner triangulation sensor configured as a point sensor or line sensor and outer triangulation sensors configured as a line sensor.
At least one of the following triangulation sensors:
a) the inner triangulation sensor; and b) at least one of the outer triangulation sensors preferably records position data from only one position in the transverse direction.
- 3 -Date Recue/Date Received 2021-02-18 In this case, the inner triangulation sensor and/or at least one of the outer triangulation sensors are thus designed as a point sensor. As is shown with reference to the figures, such a point sensor records a two-dimensional data set as a measurement signal, from which the corresponding position(s) of one or more interfaces can be determined.
This configuration allows in particular existing systems, which often already have one or more point sensors, to be retrofitted in a simple manner.
According to an advantageous embodiment, the method further comprises the following steps:
i) Establishing a first position of the triangulation sensors in the transverse direction;
ii) Relative movement between the sensor device and the glass pane in the movement direction, during which the triangulation sensors record position data;
iii) Setting a second position that is different from the first position in the transverse direction of at least the outer triangulation sensors;
iv) Relative movement between the sensor device and the glass pane in the movement direction, during which at least the outer triangulation sensors record position data.
In particular, the relative movements according to step ii) and iv) are a back and forth movement in the movement direction. Thus, two position data sets of two positions can be recorded in the transverse direction using a single triangulation sensor by means of two relative movements in the movement direction, by virtue of the corresponding triangulation sensor being moved in the transverse direction between the relative movements.
In this way, with an identical number of triangulation sensors, the number of the positions in the transverse direction at which the curvature is determined can be doubled.
In this context, it is generally preferred that at least one of the outer triangulation sensors is moved at least intermittently in the transverse direction while position data is recorded.
Complex paths can thus be navigated on the glass pane to be measured, and therefore it is possible in one measurement to measure the curvature of exactly defined regions of the glass pane.
According to an advantageous embodiment, two or more outer triangulation sensors are provided on one side of the inner triangulation sensor.
This configuration allows in particular existing systems, which often already have one or more point sensors, to be retrofitted in a simple manner.
According to an advantageous embodiment, the method further comprises the following steps:
i) Establishing a first position of the triangulation sensors in the transverse direction;
ii) Relative movement between the sensor device and the glass pane in the movement direction, during which the triangulation sensors record position data;
iii) Setting a second position that is different from the first position in the transverse direction of at least the outer triangulation sensors;
iv) Relative movement between the sensor device and the glass pane in the movement direction, during which at least the outer triangulation sensors record position data.
In particular, the relative movements according to step ii) and iv) are a back and forth movement in the movement direction. Thus, two position data sets of two positions can be recorded in the transverse direction using a single triangulation sensor by means of two relative movements in the movement direction, by virtue of the corresponding triangulation sensor being moved in the transverse direction between the relative movements.
In this way, with an identical number of triangulation sensors, the number of the positions in the transverse direction at which the curvature is determined can be doubled.
In this context, it is generally preferred that at least one of the outer triangulation sensors is moved at least intermittently in the transverse direction while position data is recorded.
Complex paths can thus be navigated on the glass pane to be measured, and therefore it is possible in one measurement to measure the curvature of exactly defined regions of the glass pane.
According to an advantageous embodiment, two or more outer triangulation sensors are provided on one side of the inner triangulation sensor.
- 4 -Date Recue/Date Received 2021-02-18 This allows the outer triangulation sensors to record position data in parallel at a plurality of positions in the transverse direction.
According to an advantageous embodiment, at least one of the following triangulation sensors:
a) the inner triangulation sensor; and b) at least one of the outer triangulation sensors records position data from a plurality of positions in the transverse direction simultaneously.
This can be achieved in particular by designing the corresponding sensor as a so-called line sensor, which simultaneously records data on a line of the measurement object.
This creates a three-dimensional measurement signal from the scattering, from which the position of the corresponding interface(s) can be read.
In this context, it is particularly preferred that at least one of the following triangulation sensors:
a) the inner triangulation sensor; and b) at least one of the outer triangulation sensors is designed as a line sensor, the light emission unit of which emits light in a line transverse to the movement direction.
The corresponding triangulation sensor thus simultaneously records data from a plurality of positions in the transverse direction. It is preferably possible to extract the position data and thus the curvature of the glass pane for specific positions in the transverse direction from these data, such that the corresponding view can be limited to the regions of the glass pane that are particularly relevant.
Furthermore, a method for determining the curvature of a windshield is proposed, at least one element of a windshield being subjected to a method according to the invention after the molding process.
This means in particular that in the case of windshields that are constructed from a plurality of glass panes, individual glass panes are measured, or a plurality or even all of the glass panes from which the windshield is produced are measured simultaneously. In such a case, the triangulation sensors provide measurement data from each interface that is present, i.e.
in particular there are position data sets for the various interfaces that can be viewed and evaluated accordingly.
According to an advantageous embodiment, at least one of the following triangulation sensors:
a) the inner triangulation sensor; and b) at least one of the outer triangulation sensors records position data from a plurality of positions in the transverse direction simultaneously.
This can be achieved in particular by designing the corresponding sensor as a so-called line sensor, which simultaneously records data on a line of the measurement object.
This creates a three-dimensional measurement signal from the scattering, from which the position of the corresponding interface(s) can be read.
In this context, it is particularly preferred that at least one of the following triangulation sensors:
a) the inner triangulation sensor; and b) at least one of the outer triangulation sensors is designed as a line sensor, the light emission unit of which emits light in a line transverse to the movement direction.
The corresponding triangulation sensor thus simultaneously records data from a plurality of positions in the transverse direction. It is preferably possible to extract the position data and thus the curvature of the glass pane for specific positions in the transverse direction from these data, such that the corresponding view can be limited to the regions of the glass pane that are particularly relevant.
Furthermore, a method for determining the curvature of a windshield is proposed, at least one element of a windshield being subjected to a method according to the invention after the molding process.
This means in particular that in the case of windshields that are constructed from a plurality of glass panes, individual glass panes are measured, or a plurality or even all of the glass panes from which the windshield is produced are measured simultaneously. In such a case, the triangulation sensors provide measurement data from each interface that is present, i.e.
in particular there are position data sets for the various interfaces that can be viewed and evaluated accordingly.
- 5 -Date Recue/Date Received 2021-02-18 The described method is used in particular immediately after the molding process of the glass pane, but it is alternatively or additionally also possible to monitor the curvature of the at least one glass pane, in particular a windshield, at other times/locations of the production process.
In this context, a method for monitoring the production process of a windshield is proposed, the curvature of at least one element of a windshield being determined at least at two points in time in accordance with a method according to the invention, and the curvature data obtained being stored and the curvature data being correlated with one another in order to monitor the production process.
"Correlation" is also understood to mean, in particular, the comparison with a normative data set and/or the comparison of the change between the data sets. In this context, an "element"
is to be understood in particular as a glass pane from which the windshield is produced, or all of the glass panes that are joined together to form the windshield as part of the production process. This correlation of the curvature data makes it simple to identify undesirable developments in the manufacture of windshields, since changes or faults that affect the curvature of the elements can be detected immediately. For example, damage can be identified immediately in the production facilities.
The invention and the technical environment will be explained in more detail with reference to the figures. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects from the facts explained in the figures and to combine them with other components and/or insights from other figures and/or from the present description. In the drawings, shown schematically:
Fig. 1 is an example of a sensor device for determining the curvature of at least one glass pane;
Fig. 2 is an explanation of the measuring principle;
Fig. 3 to 5 are examples of procedures for measuring the curvature of at least one glass pane; and Fig. 6 is a further example of a sensor device with a corresponding procedure for measuring the curvature of at least one glass pane.
In this context, a method for monitoring the production process of a windshield is proposed, the curvature of at least one element of a windshield being determined at least at two points in time in accordance with a method according to the invention, and the curvature data obtained being stored and the curvature data being correlated with one another in order to monitor the production process.
"Correlation" is also understood to mean, in particular, the comparison with a normative data set and/or the comparison of the change between the data sets. In this context, an "element"
is to be understood in particular as a glass pane from which the windshield is produced, or all of the glass panes that are joined together to form the windshield as part of the production process. This correlation of the curvature data makes it simple to identify undesirable developments in the manufacture of windshields, since changes or faults that affect the curvature of the elements can be detected immediately. For example, damage can be identified immediately in the production facilities.
The invention and the technical environment will be explained in more detail with reference to the figures. It should be noted that the invention should not be limited by the embodiments shown. In particular, unless explicitly stated otherwise, it is also possible to extract partial aspects from the facts explained in the figures and to combine them with other components and/or insights from other figures and/or from the present description. In the drawings, shown schematically:
Fig. 1 is an example of a sensor device for determining the curvature of at least one glass pane;
Fig. 2 is an explanation of the measuring principle;
Fig. 3 to 5 are examples of procedures for measuring the curvature of at least one glass pane; and Fig. 6 is a further example of a sensor device with a corresponding procedure for measuring the curvature of at least one glass pane.
- 6 -Date Recue/Date Received 2021-02-18 A plurality of measurement methods for measuring the curvature of at least one glass pane are described below. Here, the same elements are provided with the same reference numerals.
Fig. 1 shows schematically an example of a sensor device 1 for determining the curvature of at least one glass pane. The device 1 has a measurement arm 20, on which sensor holders 21 are mounted, which are movable in a transverse direction 2. At least one triangulation sensor, which is described in more detail with reference to Fig. 2, is accommodated in or on each sensor holder 21. The triangulation sensor in the relevant sensor holder 21 emits a laser beam 6 onto a surface, the distance of which from the measurement arm 20 and/or a defined reference plane is to be determined.
Fig. 2 schematically shows a triangulation sensor 3 which comprises a light emission unit 4 and a light detection unit 5. The light emission unit 4 emits a laser beam 6 in the direction of the surface to be measured. The laser beam 6 is directed onto a windshield 7, which consists of a first glass pane 8 and a second glass pane 9. The light beam is scattered and is scattered as a scattered light beam 10 in the direction of the light detection unit 5, in which a measurement signal 11 is recorded, which is shown as an example. Said measurement signal 11 has a plurality of peaks which originate in particular from the signals at the interfaces of the individual glass panes 8, 9. The laser beam 6 first passes a first interface 12 between the ambient air and the first glass pane 8, then a second interface 13 between the first glass pane 8 and the second glass pane 9, and a third interface 14 between the second glass pane 9 and the ambient air. The scattering of the light creates a spectrum in the measurement signal 11 having different peaks that can be associated with the individual interfaces.
This makes it possible to determine the distances between the interfaces 12, 13, 14 and a calibrated reference plane, for example spanned by the measurement arm 20, and the vector of the movement direction 15 of a relative movement between the measurement arm 20 and the glass pane 8, 9. Knowing the distances between the interfaces 12, 13, 14 and the reference plane at the position at which the laser beam 6 impinges on the interface 12, 13, 14 and the correlation of these distances with one another, the thicknesses of the first glass pane 8 and the second glass pane 9 can be determined.
With reference again to Fig. 1, it will now be described how the sensor device 1 from Fig. 1 can be used accordingly for determining the curvature of the windshield 7. For this purpose, a relative movement is caused between the measurement arm 20 and the windshield 7 in a
Fig. 1 shows schematically an example of a sensor device 1 for determining the curvature of at least one glass pane. The device 1 has a measurement arm 20, on which sensor holders 21 are mounted, which are movable in a transverse direction 2. At least one triangulation sensor, which is described in more detail with reference to Fig. 2, is accommodated in or on each sensor holder 21. The triangulation sensor in the relevant sensor holder 21 emits a laser beam 6 onto a surface, the distance of which from the measurement arm 20 and/or a defined reference plane is to be determined.
Fig. 2 schematically shows a triangulation sensor 3 which comprises a light emission unit 4 and a light detection unit 5. The light emission unit 4 emits a laser beam 6 in the direction of the surface to be measured. The laser beam 6 is directed onto a windshield 7, which consists of a first glass pane 8 and a second glass pane 9. The light beam is scattered and is scattered as a scattered light beam 10 in the direction of the light detection unit 5, in which a measurement signal 11 is recorded, which is shown as an example. Said measurement signal 11 has a plurality of peaks which originate in particular from the signals at the interfaces of the individual glass panes 8, 9. The laser beam 6 first passes a first interface 12 between the ambient air and the first glass pane 8, then a second interface 13 between the first glass pane 8 and the second glass pane 9, and a third interface 14 between the second glass pane 9 and the ambient air. The scattering of the light creates a spectrum in the measurement signal 11 having different peaks that can be associated with the individual interfaces.
This makes it possible to determine the distances between the interfaces 12, 13, 14 and a calibrated reference plane, for example spanned by the measurement arm 20, and the vector of the movement direction 15 of a relative movement between the measurement arm 20 and the glass pane 8, 9. Knowing the distances between the interfaces 12, 13, 14 and the reference plane at the position at which the laser beam 6 impinges on the interface 12, 13, 14 and the correlation of these distances with one another, the thicknesses of the first glass pane 8 and the second glass pane 9 can be determined.
With reference again to Fig. 1, it will now be described how the sensor device 1 from Fig. 1 can be used accordingly for determining the curvature of the windshield 7. For this purpose, a relative movement is caused between the measurement arm 20 and the windshield 7 in a
- 7 -Date Recue/Date Received 2021-02-18 movement direction 15 by moving the sensor device 1 relative to the windshield 7 and/or moving the windshield 7 relative to the sensor device 1. An inner triangulation sensor 15 is usually aligned with a central axis 16 of the windshield 7. As a result, the inner triangulation sensor 17 records position data from the central axis 16 of the windshield 7.
Furthermore, two outer triangulation sensors 18 are provided which are on the outside compared to the inner triangulation sensor 17, i.e. are provided on the measurement arm 20 outside the inner triangulation sensor 17 so that the inner triangulation sensor 17 is between the outer triangulation sensors 18. The outer triangulation sensors 18 can record position data from regions outside the central axis 16 of the windshield 7, for example from regions that are in the drivers or front passengers field of vision after the windshield 7 has been installed. In particular in situations in which the most precise possible contour of the windshield 7 is more and more important, corresponding measurement methods are inadequate, since more and more regions of the windshield 7 are functionalized, for example for heads-up displays in which information is projected into the windshield 7 so that the driver sees the reflection of the information in the windshield 7, or by providing sensors or the like.
A further measurement method will therefore now be described with reference to Fig. 3. Only the differences from the method described above are discussed; in addition, reference is made to the statements made above. Here the measurement arm 20 likewise has three sensor carriers 21, but the corresponding outer sensor carriers 21 each have two outer triangulation sensors 18. This increases the number of laser beams 6 emitted by the corresponding triangulation sensors. As a result, with a single relative movement between the windshield 7 and the measurement arm 20, position data from a plurality of measurement paths, i.e. at a plurality of positions in the transverse direction 2, can be recorded, and therefore the quality of the curvature measurement is improved in a simple manner.
Fig. 4 shows a further example of a measuring method in which, in contrast to the method disclosed in conjunction with Fig. 3, three outer triangulation sensors 18 are provided on each of the sensor carriers 21. As a result, three times more position data is recorded in the region of the outer triangulation sensors 18 than in the example from Fig. 1.
Fig. 5 shows an alternative process to the example of the process from Fig. 4, which, however, can also be combined with the process from Fig. 2 to 3. Only the differences from the method described above are discussed; in addition, reference is made to the statements
Furthermore, two outer triangulation sensors 18 are provided which are on the outside compared to the inner triangulation sensor 17, i.e. are provided on the measurement arm 20 outside the inner triangulation sensor 17 so that the inner triangulation sensor 17 is between the outer triangulation sensors 18. The outer triangulation sensors 18 can record position data from regions outside the central axis 16 of the windshield 7, for example from regions that are in the drivers or front passengers field of vision after the windshield 7 has been installed. In particular in situations in which the most precise possible contour of the windshield 7 is more and more important, corresponding measurement methods are inadequate, since more and more regions of the windshield 7 are functionalized, for example for heads-up displays in which information is projected into the windshield 7 so that the driver sees the reflection of the information in the windshield 7, or by providing sensors or the like.
A further measurement method will therefore now be described with reference to Fig. 3. Only the differences from the method described above are discussed; in addition, reference is made to the statements made above. Here the measurement arm 20 likewise has three sensor carriers 21, but the corresponding outer sensor carriers 21 each have two outer triangulation sensors 18. This increases the number of laser beams 6 emitted by the corresponding triangulation sensors. As a result, with a single relative movement between the windshield 7 and the measurement arm 20, position data from a plurality of measurement paths, i.e. at a plurality of positions in the transverse direction 2, can be recorded, and therefore the quality of the curvature measurement is improved in a simple manner.
Fig. 4 shows a further example of a measuring method in which, in contrast to the method disclosed in conjunction with Fig. 3, three outer triangulation sensors 18 are provided on each of the sensor carriers 21. As a result, three times more position data is recorded in the region of the outer triangulation sensors 18 than in the example from Fig. 1.
Fig. 5 shows an alternative process to the example of the process from Fig. 4, which, however, can also be combined with the process from Fig. 2 to 3. Only the differences from the method described above are discussed; in addition, reference is made to the statements
- 8 -Date Recue/Date Received 2021-02-18 made above. Here, compared to the above-described processes, the relative movement between the windshield 7 and the measurement arm 20 is modified in that first there is a first relative movement in the movement direction 15, then a relative movement in the transverse direction 2 transversely to movement direction 15, and then a third relative movement counter to the movement direction 15. At least during the first and third relative movement, the corresponding triangulation sensors 17, 18 record position data. The windshield 7 and the measurement arm 20 are therefore moved back and forth relative to one another. This can be achieved by moving the windshield 7 accordingly and/or by moving the measurement arm 20 accordingly. A procedure of this kind doubles the amount of recorded data compared to the process according to Fig. 2 to 4, in particular the number of recorded tracks 19, i.e. the position data at a specific position in the transverse direction 2, is doubled in a simple manner.
Using the process described here, in particular a region can be measured more precisely, which in later operation is used, for example, as a projection surface for a heads-up display.
A precisely defined curvature of the windshield 7 is particularly important here, since the curvature of the windshield 7 and the precision thereof in this region allow the data to be seen in the head-up display to be displayed as cleanly as possible and abnormalities easily lead to the windshield 7 not being usable.
Fig. 6 shows an example in which three line sensors are designed as triangulation sensors 17, 18 on the measurement arm 20. These line sensors record data from a line instead of data from a single point. A process of this kind makes it possible to select, from the data obtained by the triangulation sensors 17, 18, individual tracks 19 (which are only shown here by way of example) of which the curvature is to be measured. The corresponding position data are then extracted from the position data obtained overall by the corresponding triangulation sensor 17, 18. In principle, the triangulation sensors 17, 18 can be designed in such a way that they capture the windshield 7 completely in the transverse direction 2.
Using the process described here, in particular a region can be measured more precisely, which in later operation is used, for example, as a projection surface for a heads-up display.
A precisely defined curvature of the windshield 7 is particularly important here, since the curvature of the windshield 7 and the precision thereof in this region allow the data to be seen in the head-up display to be displayed as cleanly as possible and abnormalities easily lead to the windshield 7 not being usable.
Fig. 6 shows an example in which three line sensors are designed as triangulation sensors 17, 18 on the measurement arm 20. These line sensors record data from a line instead of data from a single point. A process of this kind makes it possible to select, from the data obtained by the triangulation sensors 17, 18, individual tracks 19 (which are only shown here by way of example) of which the curvature is to be measured. The corresponding position data are then extracted from the position data obtained overall by the corresponding triangulation sensor 17, 18. In principle, the triangulation sensors 17, 18 can be designed in such a way that they capture the windshield 7 completely in the transverse direction 2.
- 9 -Date Recue/Date Received 2021-02-18 List of reference signs 1 Sensor device 2 Transverse direction 3 Triangulation sensor 4 Light emission unit Light detection unit 6 Laser beam 7 Windshield 8 First glass pane 9 Second glass pane Light beam 11 Measurement signal 12 First interface 13 Second interface 14 Third interface Movement direction 16 Central axis 17 Inner triangulation sensor 18 Outer triangulation sensor 19 Track Measurement arm 21 Sensor holder
- 10 -Date Recue/Date Received 2021-02-18
Claims (9)
1. Method for determining the curvature of at least one glass pane (7, 8, 9), in which the at least one glass pane (7, 8, 9) and a sensor device (1) can be moved relative to one another in a movement direction (15) and the sensor device (1) has at least three triangulation sensors (3, 17, 18), each having a light emission unit (4) which emits light onto the at least one glass pane (7, 8, 9), and having a light detection unit (5) which detects the light scattered by the at least one glass pane (7, 8, 9), such that the triangulation sensors (3, 17, 18) record position data from the at least one glass pane (7, 8, 9) which cover the at least one glass pane (7, 8, 9) in the movement direction (15), wherein the triangulation sensors (3, 17, 18) have different positions in a transverse direction (2) transverse to the movement direction (15), with an inner triangulation sensor (17) and at least two outer triangulation sensors (18) outside the inner triangulation sensor (17) in the transverse direction (2), characterized in that the outer triangulation sensors (18) record position data from at least two positions in the transverse direction (2).
2. Method according to claim 1, in which at least one of the following triangulation sensors:
a) the inner triangulation sensor (17); and b) at least one of the outer triangulation sensors (18) records position data from only one position in the transverse direction (2).
a) the inner triangulation sensor (17); and b) at least one of the outer triangulation sensors (18) records position data from only one position in the transverse direction (2).
3. Method according to either of the preceding claims, comprising the following steps:
i) Establishing a first position of the triangulation sensors (17, 18) in the transverse direction (2);
ii) Relative movement between the sensor device (1) and the glass pane (7, 8, 9) in the movement direction (15), during which the triangulation sensors (17, 18) record position data;
iii) Setting a second position that is different from the first position in the transverse direction (2) of at least the outer triangulation sensors (18);
iv) Relative movement between the sensor device (1) and the glass pane (7, 8, 9) in the movement direction (15), during which at least the outer triangulation sensors (17, 18) record position data.
Date Recue/Date Received 2021-02-18
i) Establishing a first position of the triangulation sensors (17, 18) in the transverse direction (2);
ii) Relative movement between the sensor device (1) and the glass pane (7, 8, 9) in the movement direction (15), during which the triangulation sensors (17, 18) record position data;
iii) Setting a second position that is different from the first position in the transverse direction (2) of at least the outer triangulation sensors (18);
iv) Relative movement between the sensor device (1) and the glass pane (7, 8, 9) in the movement direction (15), during which at least the outer triangulation sensors (17, 18) record position data.
Date Recue/Date Received 2021-02-18
4. Method according to any of the preceding claims, in which at least one of the outer triangulation sensors (18) is moved at least intermittently in the transverse direction (2) while position data is recorded.
5. Method according to any of the preceding claims, in which two or more outer triangulation sensors (18) are on one side of the inner triangulation sensor (17).
6. Method according to any of the preceding claims, in which at least one of the following triangulation sensors:
a) the inner triangulation sensor (17); and b) at least one of the outer triangulation sensors (18) simultaneously records position data from a plurality of positions in the transverse direction (2).
a) the inner triangulation sensor (17); and b) at least one of the outer triangulation sensors (18) simultaneously records position data from a plurality of positions in the transverse direction (2).
7. Method according to claim 6, in which at least one of the following triangulation sensors:
a) the inner triangulation sensor (17); and b) at least one of the outer triangulation sensors (18) is designed as a line sensor, the light emission unit (4) of which emits light in a line transverse to the movement direction (15).
a) the inner triangulation sensor (17); and b) at least one of the outer triangulation sensors (18) is designed as a line sensor, the light emission unit (4) of which emits light in a line transverse to the movement direction (15).
8. Method for determining the curvature of a windshield (7), wherein at least one element (7, 8, 9) of a windshield (7) is subjected to a method according to any of the preceding claims after the molding process.
9. Method for monitoring the production process of a windshield (7), wherein the curvature of at least one element (7, 8, 9) of a windshield (7) is determined at least at two points of time in accordance with a method according to any of the preceding claims, the curvature data obtained are stored and the curvature data are correlated with one another in order to monitor the production process.
Date Recue/Date Received 2021-02-18
Date Recue/Date Received 2021-02-18
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102018121337.9A DE102018121337A1 (en) | 2018-08-31 | 2018-08-31 | Method for determining the curvature of a glass pane, in particular a windshield |
| DE102018121337.9 | 2018-08-31 | ||
| PCT/EP2019/070424 WO2020043411A1 (en) | 2018-08-31 | 2019-07-30 | Method for determining the curvature of a glass pane, more particularly a windscreen pane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3109997A1 true CA3109997A1 (en) | 2020-03-05 |
Family
ID=67659803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3109997A Pending CA3109997A1 (en) | 2018-08-31 | 2019-07-30 | Method for determining the curvature of a glass pane, more particularly a windshield |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP3844454A1 (en) |
| CN (1) | CN112752948B (en) |
| CA (1) | CA3109997A1 (en) |
| DE (1) | DE102018121337A1 (en) |
| MA (1) | MA53477A (en) |
| WO (1) | WO2020043411A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2695049B1 (en) * | 1992-09-03 | 1994-11-10 | Lorraine Laminage | Method and device for evaluating the flatness of a strip and line for manufacturing a continuous strip comprising a device for evaluating the flatness of the strip. |
| US5726749A (en) * | 1996-09-20 | 1998-03-10 | Libbey-Owens-Ford Co. | Method and apparatus for inspection and evaluation of angular deviation and distortion defects for transparent sheets |
| DE19932324B8 (en) * | 1999-07-10 | 2008-04-10 | Betriebsforschungsinstitut VDEh - Institut für angewandte Forschung GmbH | Method for determining the flatness or waviness of a moving belt |
| DE10045105C2 (en) * | 2000-09-12 | 2002-09-26 | Innomess Ges Fuer Messtechnik | Method and device for measuring the deflection of a reflective surface |
| WO2005022127A2 (en) * | 2003-08-21 | 2005-03-10 | Sensor-Tech Messtechnik Gmbh | Device for measuring a planar element |
| AT502548B1 (en) * | 2005-09-20 | 2008-07-15 | Neusiedler Ag | METHOD AND DEVICE FOR DETERMINING THE CURING OF A SURFACE OF AN OBJECT, FOR EXAMPLE, PAPER OR CARTON, AND THE USE THEREOF |
| DE102006013584B4 (en) * | 2006-03-22 | 2014-07-10 | Benteler Automobiltechnik Gmbh | Device for measuring components |
| FR3010182A1 (en) * | 2013-08-30 | 2015-03-06 | Msc & Sgcc | METHOD AND DEVICE FOR DETERMINING THE POSITION AND ORIENTATION OF A SPECULAR SURFACE FORMING A DIOPTER |
| US9952037B2 (en) * | 2015-06-26 | 2018-04-24 | Glasstech, Inc. | System and method for developing three-dimensional surface information corresponding to a contoured sheet |
| IT201700068661A1 (en) * | 2017-06-20 | 2018-12-20 | Moro Spa | PLANARITY CONTROL OF SHEETS |
-
2018
- 2018-08-31 DE DE102018121337.9A patent/DE102018121337A1/en active Pending
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2019
- 2019-07-30 CN CN201980056914.0A patent/CN112752948B/en active Active
- 2019-07-30 WO PCT/EP2019/070424 patent/WO2020043411A1/en unknown
- 2019-07-30 CA CA3109997A patent/CA3109997A1/en active Pending
- 2019-07-30 MA MA053477A patent/MA53477A/en unknown
- 2019-07-30 EP EP19753264.1A patent/EP3844454A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN112752948A (en) | 2021-05-04 |
| WO2020043411A1 (en) | 2020-03-05 |
| DE102018121337A1 (en) | 2020-03-05 |
| CN112752948B (en) | 2022-09-30 |
| MA53477A (en) | 2021-12-08 |
| EP3844454A1 (en) | 2021-07-07 |
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