DE102015207213B4 - Apparatus and method for testing discs - Google Patents

Abstract

Device (1) for testing discs (2), comprising a disc holding device (3) for holding a disc (2), a projection device (4) for generating a test image (5) in a target position (TL) relative to the disc (2) and projecting the test image (5) onto the target layer (TL) disc (2), a holding device (6) for holding the projecting device (4) in the target position (TL), an optical detection device (7) for detecting the projected test image (5) and an evaluation unit (8) for comparing the acquired projected test pattern (5) with a reference image (9), characterized in that the holding device (6) is formed, the projection device (4) in a reference position (RL) relative to Disk (2) to hold, wherein the reference position (RL) of the target position (TL) is different, and wherein the projection device (4) is formed, in the reference position (RL) one of the detection device (7) detectable reference image (9) to create.

Description

The present invention relates to an apparatus and a method for testing discs, in particular for determining optical distortions of discs, in particular windscreens for motor vehicles.

In motor vehicles, for displaying information, e.g. Operating parameters or warnings, increasingly used so-called "Head-Up Displays" (HUD). Such HUDs have the advantage over conventional display means that the information to be displayed can be projected directly onto the windshield, so that the driver's eye of the motor vehicle can remain focused on the road when viewing the information. This can reduce an accident risk.

Modern HUDs have a projection unit that generates a distorted image and projects it to a dedicated area of the windshield. In this case, the image is distorted so that the projected image on the windshield by the windshield geometry for the driver as a non-distorted image is perceptible.

To ensure that the image is properly projected onto the windshield, the windshield must meet given quality requirements. This is particularly important in windshields of motor vehicles, as they have a laminated safety glass with an integrated wedge film and are produced in a complicated or complex manufacturing process. Even small deviations from a given wheel condition can lead to such distortions or a blur of the projected image, which are perceived by the driver. Such distortions may be of a purely aesthetic nature, such that they are perceived by the driver merely as a poor quality of the HUD. For more severe blurring, some elements of the projected image, such as those shown in FIG. small characters, the driver may no longer be detected correctly.

Therefore, it is necessary to protect windshields for any defects of the wheel condition such as e.g. the disk geometry or disk composition, to ensure a correct representation of the projected image of the HUD. For this purpose, devices for testing discs are known, which have a disc-specific holding frame for holding a disc. The disc-specific holding frame can be inserted into a base frame of the device. The apparatus includes a HUD projector for projecting an image on the disc and a camera for capturing the projected image. Furthermore, the device has a disk-specific reference image, which is formed for example as a sheet with a plurality of holes. The reference image can also be captured by the camera. By comparing the acquired projected image with the detected reference image by means of a recognition software, it is thus possible to determine how much the quality of the pane deviates from a predetermined pane condition.

From the documents DE 10 2009 021 733 A1 . DE 10 2004 007 828 B4 . DE 10 2013 212 827 B4 . US 6 199 990 A and DE 10 2004 033 526 A1 For example, various methods and devices for inspecting reflective or partially reflecting surfaces are known.

Such devices have the disadvantage that disk-specific reference images and disk-specific holding frames are required for disks of different shape and / or size and / or texture. This results in high manufacturing, personnel and storage costs. Moreover, to test different slices, long setup times are required to swap the reference images and support frames. Furthermore, erroneously generated images of the HUD projector can easily be interpreted as an error of the disc.

It is therefore the object of the present invention to optimize the testing of windows, in particular windshields of motor vehicles, wherein the disadvantages of the prior art are at least partially overcome. In particular, it is the object of the present invention to provide an apparatus and a method for testing discs, by means of which a cost-effective testing of discs, in particular a high number of variants of discs, such as. Windshields of motor vehicles, is made possible.

The above object is achieved by a device for testing discs with the features of independent claim 1. Furthermore, the object is achieved by a method testing discs with the features of independent claim 11. Further features of the invention will become apparent from the dependent claims , the description and the drawings. In this case, features and details that are described in connection with the device according to the invention for testing discs, of course, also in connection with the inventive method for testing discs and each vice versa, so that with respect to the disclosure of the individual aspects of the invention always reciprocal reference or. can be. Of course, the inventive disc inspection apparatus of the present invention can also be used to inspect discs.

The disc inspection device according to the invention comprises a disc holding device for holding a disc, a projection device for generating a test image in a target position relative to the disc, and projecting the test image onto the disc from the target position, a holding device for holding the projection device in the target position, an optical device A detection device for detecting the projected test image and an evaluation unit for comparing the acquired projected test image with a reference image. The holding device is designed to hold the projection device in a reference position relative to the disc, wherein the reference position is different from the target position. The projection device is designed to generate a reference image detectable by the detection device in the reference position.

By means of the device, in particular panes, in particular windscreens for motor vehicles, made of plastic or glass, in particular safety glass, such as e.g. Laminated safety glass, testable.

The disk holding device is designed to hold a disk. A disk can be placed, for example, at supporting points provided for this purpose the disk holding device. Alignment of the disk relative to the disk holding device preferably occurs over an upper edge of the disk and corresponding alignment elements, such as e.g. End stops, the disc holder. The disk holding device preferably has a fixing device for fixing the disk to the disk holding device.

The projection device is held on a holding device and can be arranged on it in a target position and a reference position. The projection device is designed to generate a test pattern in the target position and to project this test pattern onto the pane arranged on the pane holding device. In addition, the projection device is designed to generate a reference image in the reference position. Since vehicles with a left-hand drive and vehicles with a right-hand drive occur, there are each a target position and a reference position for left-hand drive and right-hand drive. It is preferred that the device is designed both for testing left-hand drive wheels and right-hand drive windows. In the following, for better understanding, reference will always be made to only one target position and only one corresponding reference position.

The target layer is preferably on the same side of the disc as the detection device. Particularly preferably, the target position corresponds to a relative position of a HUD projector of a motor vehicle to the pane. Thus, a portion of the disk is provided, which is intended for a HUD. The reference position is different from the target position. Preferably, the reference layer is on a different side of the disc than the detection device. In this case, the reference position and the target position are arranged in such a way to the disk and detection unit that the reference image and the test pattern projected onto the disk can be detected superimposed by the detection unit. In the case of a flawless pane, the reference image and the projected test image that can be detected by the detection unit can only be recognized as a single image.

The test image may correspond, for example, to a conventional HUD image of a motor vehicle. Alternatively, the test image has a pattern, such as e.g. a plurality of spots and / or stripes and / or other geometric shapes suitable for testing the pane. The elements of the pattern are preferably distributed substantially regularly over the test image. Moreover, the test image has such a distortion that the test image projected on an error-free disk can be detected by the detection apparatus without distortion. One degree of distortion depends on the target location as well as a condition of the disc, such as a disc. a curvature, from. It can be provided that the test image is not a rigid image but an image sequence. As a result, a more accurate test result of the disc can be achieved.

The detection device is configured to detect the projected test image and the reference image. When using only one projection device, the projected test image and the reference image can only be detected offset in time. The detected projected test image and the acquired reference image are preferably stored in a storage device. By means of an evaluation unit, the detected projected test image and the detected reference image are comparable with each other. Due to deviations of these images, the evaluation unit can determine a defect of the disc qualitatively and quantitatively.

The device according to the invention for testing discs has the advantage that a disc can be tested by simple means. By means of the projection device a plurality of different test images and reference images can be generated, so that prefabricated disc-specific reference images, such as perforated plates, are not required. The disk holding device is designed to receive and align a plurality of disks of different dimensions. On In this way, manufacturing costs of the perforated plates and the disc-specific holding frame for the different panes can be saved. Furthermore, thus also eliminates long setup times, since the generation of different reference images can be done by means of the same projection device.

According to a first aspect of the invention, the holding device is designed to move the projection device from the target position into the reference position and / or from the reference position into the target position. Here, the holding device is preferably designed such that such a movement is possible without collision when arranged on the device disc. The movement takes place, for example, via a drive, for example an electric motor. Particularly preferably, the holding device is designed as a robot arm with a receiving device for holding the projection device. By means of such a holding device, the projection device can be moved quickly between the target position and the reference position. This has the advantage that a test procedure for testing a disc is correspondingly fast. Thus test time and costs are reducible.

According to an advantageous embodiment of the invention, the projection device for generating the test image and the reference image on a monitor. Preferably, the monitor has a luminance of at least 400 cd / m ² . More preferably, the monitor has a typical contrast ratio of at least 2000: 1. More preferably, the contrast ratio is static. A preferred resolution of the monitor is 1900 x 1200 pixels. It is preferable that the monitor is specified according to AMVA (Advanced Multi-Domain Vertical Alignment) technology. More preferably, a film for suppressing the moiré effect is arranged on the projection device. Such a film preferably has a matted surface.

Likewise advantageously, the device has a control device for controlling the projection device. The control device is designed to generate at least one such distorted test image by means of the projection device such that a test image that is detectable by the detection device and projected onto the pane corresponds to the detectable reference image. In the design of the control device is preferably assumed that a fault-free disk. It can also be provided within the scope of the invention that the control device is designed to distort the test image in such a way that deviations from the projected test image and reference image detected by the detection device are thereby compensated for again. By this additional distortion a defect of the disc can be determined. A control device has the advantage that a distorted test pattern for testing a pane can be generated by simple means.

More preferably, the control device is designed such that at least one test image and one reference image are generated for each of a plurality of different panes by means of the projection device. Such a control device has the advantage that with simple means a plurality of test images can be generated, which are suitable for testing a multiplicity of differently shaped panes.

It is preferred that the disc holding device has a plurality of abutment points for receiving the disc, wherein at least a portion of the abutment points is adjustable, wherein the adjustable abutment points are adjustable so that at least one disc of defined dimensions can be arranged on the disc holder such that the Disc is aligned by the contact points in a defined test position. A part of the bearing points is preferably designed to bear an upper edge of a disk. In this case, the contact points can be arranged relative to one another such that a disk to be arranged at the contact points can be aligned in a form-fitting manner at the contact points in the defined test position. In other words, the contact points can be arranged in such a way that they each form an abutment point of a disc-specific contour. In this case, these bearing points are preferably arranged such that by the arrangement of the bearing points a unique position disc, namely the test position is given. The defined test position is a position of the disk that has this during the test process. Such investment points have the advantage that alignment of the disc in the test position by means of the adjustable contact points can be easily done.

In a preferred embodiment of the invention, the adjustable abutment points are adjustable so that different discs can be arranged on the disc holder device and aligned over the contact points in each case in a disc-specific test position. This has the advantage that by means of a universal disk holding device a plurality of differently shaped discs can be received and aligned in each disk-specific test position. Thus, costs for production, storage and replacement of conventional holding devices can be saved.

More preferably, the disc holding device is designed such that the adjustable contact points to be adjusted such that the disc is fixable on the adjustable support points on the disc holding device. Thus, a temporary fixing of the disc to the disc holder with simple means possible. This ensures that the disc is held in the test position.

Preferably, the detection device is designed to compare the projected test image and / or the reference image with a digital ideal image. A digital ideal image corresponds to a detectable projected test image or reference image if the pane and the projection device have no defects and the projection device is arranged in the corresponding target position or reference position. Deviations of the projected test image or the reference image from the digital ideal image suggest a defect of the disc and / or the projection device and / or the detection device. Thus, test results are controllable and defects in the apparatus for testing disks or defects in performing a test of disks can be determined.

Preferably, the projection device and / or detection device are each arranged on a holding arm of a robot. It is preferred that the projection device are arranged on a first support arm of a first robot and the detection device on a second support arm of a second robot. Such robots have e.g. the advantage that a method, in particular a collision-free method, of the projection device between the target position and the reference position is improved. Further, thereby, a method of the detection device from a first position, which corresponds to, for example, a position of a driver's head in a vehicle with a left-hand drive, at least substantially, in a second position, for example, a position of a driver's head in a vehicle with a right-hand drive corresponds or at least substantially corresponds, possible. Thus, inspection of different disks is improved by means of the disk inspection device.

• - Anordnen einer Scheibe an einer Prüfvorrichtung in einer Prüflage,
• - Anordnen einer Projektionsvorrichtung in einer Referenzlage relativ zur Scheibe,
• - Erzeugen eines Referenzbilds mittels der Projektionsvorrichtung,
• - Erfassen des Referenzbilds mittels einer Erfassungsvorrichtung,
• - Anordnen der Projektionsvorrichtung in einer Targetlage relativ zur Scheibe,
• - Erzeugen eines Testbilds und projizieren des Testbilds auf die Scheibe mittels der Projektionsvorrichtung,
• - Erfassen des auf die Scheibe projizierten Testbilds mittels der E rfassu ngsvorrichtu ng,
• - Vergleichen des erfassten Referenzbilds mit dem erfassten projizierten Testbild, und
• - Bestimmen einer optischen Beschaffenheit der Scheibe auf Basis von ermittelten Abweichungen von Referenzbild und projiziertem Testbild.

Furthermore, the object is achieved according to the invention by a method for testing discs. The method comprises the following steps:

• Arranging a disc on a test device in a test position,
• Arranging a projection device in a reference position relative to the disc,
• Generating a reference image by means of the projection device,
• Acquiring the reference image by means of a detection device,
• Arranging the projection device in a target position relative to the pane,
• Generating a test image and projecting the test image onto the pane by means of the projection device,
• Detecting the test image projected on the disk by means of the detection device,
• Comparing the acquired reference image with the acquired projected test image, and
• Determining an optical condition of the disc on the basis of determined deviations from the reference image and the projected test image.

The inventive method for testing discs has the advantage that a plurality of discs of different shape, size and nature are testable by simple means. The cost of this necessary equipment, set-up times, production and storage of test materials for the generation of reference images is reduced.

It is advantageous if the test device is designed as a device according to the invention.

Preferably, the detected reference image and / or captured test image is compared with a digital ideal image. A digital ideal image corresponds to a detectable projected test image or reference image if the pane and the projection device have no defects and the projection device is arranged in the corresponding target position or reference position. Deviations of the projected test image or the reference image from the digital ideal image suggest a defect of the disc and / or the projection device and / or the detection device. Thus, test results are controllable and defects in the apparatus for testing disks or defects in performing a test of disks can be determined.

In the following, the invention will be explained in more detail with reference to a preferred embodiment.

• 1 eine schematische Seitenansicht einer bevorzugten Ausführungsform einer erfindungsgemäßen Vorrichtung zum Prüfen von Scheiben in einer Targetlage;
• 2 eine schematische Seitenansicht der bevorzugten Ausführungsform der erfindungsgemäßen Vorrichtung zum Prüfen von Scheiben aus 1 in einer Referenzlage; und
• 3 ein Flussdiagramm einer bevorzugten Ausgestaltung des erfindungsgemäßen Verfahrens zum Prüfen von Scheiben.

Show it:

• 1 a schematic side view of a preferred embodiment of a device according to the invention for testing discs in a target position;
• 2 a schematic side view of the preferred embodiment of the inventive device for testing discs 1 in a reference position; and
• 3 a flow chart of a preferred embodiment of the inventive method for testing discs.

1 shows a schematic side view of a preferred embodiment of a Device according to the invention 1 for testing discs 2 in a target position TL , The device 1 has a disk holding device 3 with a plurality of investment points 11 on. An upper attachment point in this illustration 11 is as an adjustment point 12 educated. The adjustment point 12 is an adjustable attachment point 11 and thus to the plant of discs 2 formed of different shape and size. In this view, only part of the investment points 11 the disk holding device 3 represented or recognizable.

Between the investment points 11 is a slice 2 in a test position PL arranged and from the disk holding device 3 held. A projection device 4 for generating a test image 5 is in a target position TL relative to the disc 2 arranged and produced by projection a projected test image 5a on the disc 2 , To capture the projected test image 5a has the device 1 a detection device 7 on. In this embodiment, an evaluation unit 8th for comparing the captured projected test image 5a with a reference picture 9 (see. 2 ) is formed on the detection device 7 arranged. Alternatively, the evaluation unit 8th from the detection device 7 disconnected, eg at a user terminal. The detection device 7 is about a robot 13 with holding arms 13a and holding joints 13b held in a first position. The first position corresponds at least substantially to a driver's head position in a left-hand drive vehicle. The robot 13 is preferably further developed, the detection device 7 to move from the first position without collision to a second position. The second position corresponds at least substantially to a driver's head position in a right-hand drive vehicle.

The projection device 4 is about a robot 13 trained holding device 6 with holding arms 13a and joints 13b in the target position TL held. At the projection device 4 is a control device 10 arranged. The control device 10 is formed by means of the projection device 4 at least one distorted test image 5 to create. In this case, a distortion preferably corresponds to a curvature or optical curvature of the disk 2 such that one on one in test position PL arranged, not defective disc 2 projected test image 5 from the detection device 7 as a non-distorted test image 5 is detectable. The holding device 6 is further formed, the projection device 4 between target position TL and a reference position RL (see. 2 ) without collision. Preferably, the holding device 6 further formed, the projection device 4 for right-hand drive and left-hand drive each in a corresponding target position TL and reference location RL to proceed.

It may also be provided within the scope of the invention that the means of the control device 10 and the projection device 4 generated test image 5 is not distorted or distorted in any way, so the projected test image 5 from the detection device 7 as a distorted test image 5 is detectable. In this case, the control device 10 preferably designed in such a way, by means of the projection device 4 in the reference position RL a correspondingly distorted reference image 9 to generate, with a distortion of the reference image 9 an expected distortion of the projected test image 5 corresponds when the disc 2 has no errors. From deviations of the distorted projected test image 5 and the distorted reference image 9 are thus defects of the disc 2 determined.

2 shows a schematic side view of the device 1 out 1 in a reference position RL , The holding device 6 holds in this illustration the projection device 4 in the reference position RL , The projection device 4 is in reference position RL on one of the detection device 7 and the target location TL opposite side of the disc 2 arranged and generates a reference image 9 , The reference picture 9 is from the detection device 7 directly detectable.

In 3 a preferred embodiment of the inventive method for testing discs is shown in a flow chart. In a first process step 100 becomes a slice 2 on a device according to the invention 1 in a test position PL arranged. In a second process step 200 becomes a projection device 4 in a reference position RL relative to the disc 2 by means of a holding device 6 , preferably as a robot 13 , in particular with six degrees of freedom, is formed, arranged and held (see. 2 ). In a third process step 300 is by means of the projection device 4 a reference picture 9 generated. The reference picture 9 is the disc 2 and one behind the glass 2 arranged detection device 7 facing. In a fourth process step 400 becomes the reference picture 9 from the detection device 7 detected and preferably stored in a storage device. In a fifth process step 500 becomes the projection device 4 from the holding device 6 in a target position TL moved relative to the disc and in the target position TL held. In a sixth process step 600 is by means of the projection device 4 a test picture 5 generated and on the disc 2 projected. Thus, the disc points 2 one from the detection device 7 detectable, projected test image 5a on. The test picture 5 is preferably by means of a control device 10 so distorted that one on a not broken disc 2 projected test image 5 from the detection device 7 as a non-distorted projected test image 5a is detectable. A degree of distortion is thus of an ideal geometry of a non-defective disk 2 dependent. In a seventh process step 700 this will be on the disc 2 projected test image 5a from the detection device 7 detected and preferably stored by the storage device. In an eighth process step 800 becomes the captured reference image 9 from an evaluation unit 8th with the captured projected test image 5a compared. In a ninth procedural step 900 becomes an optical condition of the disc 2 based on determined deviations from reference image 9 and projected test image 5a certainly.

Alternatively, it can also be provided that the reference position RL on the same side of the disc 2 like the target location TL and the detection device 7 is. In this case, the projection device generates 9 a reference picture 9 that on the disc 2 is projected, with the thus projected reference image 9 from the detection device 7 is detectable.

LIST OF REFERENCE NUMBERS

1

device

2

disc

3

Disc holder

4

projection device

5

test image

5a

projected test image

6

holder

7

detection device

8th

evaluation

9

reference image

10

control device

11

contact point

12

adjusting point

13

robot

13a

holding arm

13b

joint

PL

test position

RL

reference position

TL

target location

100

first process step

200

second process step

300

third process step

400

fourth process step

500

fifth process step

600

sixth process step

700

seventh process step

800

eighth process step

900

ninth process step

Claims (13)

Device (1) for testing discs (2), comprising a disc holding device (3) for holding a disc (2), a projection device (4) for generating a test image (5) in a target position (TL) relative to the disc (2) and projecting the test image (5) onto the target layer (TL) disc (2), a holding device (6) for holding the projecting device (4) in the target position (TL), an optical detection device (7) for detecting the projected test image (5) and an evaluation unit (8) for comparing the acquired projected test pattern (5) with a reference image (9), characterized in that the holding device (6) is formed, the projection device (4) in a reference position (RL) relative to Disk (2) to hold, wherein the reference position (RL) of the target position (TL) is different, and wherein the projection device (4) is formed, in the reference position (RL) one of the detection device (7) detectable reference image (9) to create. Device (1) according to Claim 1 , characterized in that the holding device (6) is designed to move the projection device (4) from the target position (TL) into the reference position (RL) and / or from the reference position (RL) into the target position (TL). Device (1) according to Claim 1 or 2 , characterized in that the projection device (4) for generating the test image (5) and the reference image (9) has a monitor. Device (1) according to one of the preceding claims, characterized in that the device (1) comprises a control device (10) for controlling the projection device (4), wherein the control device (10) is designed such, by means of the projection device (4) at least to produce such a distorted test image (5) that a test image (5) projected by the detection device (7) and projecting onto the window (2) corresponds to the detectable reference image (9). Device (1) according to Claim 4 , characterized in that the control device (10) is designed in such a way for a plurality of different slices (2) by means of the projection device (4) in each case at least one test image (5) and a reference image (9) to produce. Device (1) according to one of the preceding claims, characterized in that the Disk holding device (3) has a plurality of abutment points (11) for receiving the disc (2), wherein at least a part of the abutment points (11) is adjustable, wherein the adjustable abutment points (11) are adjustable so that at least one disc (2 ) of defined dimensions on the disc holding device (3) can be arranged such that the disc is aligned by the contact points (11) in a defined test position. Device (1) according to Claim 6 , characterized in that the adjustable contact points (12) are adjustable so that different discs (2) on the disc holding device (3) can be arranged and about the contact points (11) in each case in a disc-specific test position are aligned. Device (1) according to Claim 6 or 7 , characterized in that the disc holding device (3) is designed such that the adjustable abutment points (11) to be adjusted such that the disc (2) via the adjustable contact points (11) on the disc holding device (3) is fixable. Device (1) according to one of the preceding claims, characterized in that the detection device (7) is designed to compare the projected test image (5) and / or the reference image (9) with a digital ideal image. Device (1) according to one of the preceding claims, characterized in that the projection device (4) and / or detection device (7) are each arranged on a holding arm (13a) of a robot (13). Method for testing discs (2), comprising the steps: Arranging a disc (2) on a test device in a test position (PL), Arranging a projection device (4) in a reference position (RL) relative to the pane (2), Generating a reference image (9) by means of the projection device (4), - Detecting the reference image (9) by means of a detection device (7), Arranging the projection device (4) in a target position (TL) relative to the pane (2), Generating a test image (5) and projecting the test image (5) onto the pane (2) by means of the projection device (4), Detecting the test image (5a) projected onto the pane (2) by means of the detection device (7), - comparing the detected reference image (9) with the acquired projected test image (5a), and - Determining an optical condition of the disc (2) on the basis of determined deviations from reference image (9) and projected test image (5a). Method according to Claim 11 , characterized in that the method on a device (1) according to one of Claims 1 to 10 is performed. Method according to Claim 11 or 12 , characterized in that the detected reference image (9) and / or detected test image (5) is compared with a digital ideal image.

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