JP7057732B2 - 3D measuring device - Google Patents

Description

The present invention relates to a three-dimensional measuring device, and more particularly, to an improvement of a three-dimensional measuring device that specifies a geometric element on a measurement object and measures the shape of the measurement object using the geometric element.

A three-dimensional measuring device that measures the shape of a measurement object by specifying one or more geometric elements on the object to be measured and calculating physical quantities such as dimensions and angles of the geometric elements has been conventionally known. (For example, Patent Document 1). This type of 3D measuring device can measure the coordinates of the indicated position by the user instructing the position on the object to be measured by using the probe. Then, by specifying a geometric element based on the measured coordinates and calculating the physical quantity of the geometric element, a desired physical quantity related to the shape of the object to be measured is measured.

The measured value is presented in comparison with the design value, or is compared with the tolerance information such as the upper limit value and the lower limit value to make a pass / fail judgment. Therefore, the determination condition is specified for each measurement item.

JP-A-2015-190928

In the conventional three-dimensional measuring device, it is necessary for the user to specify the judgment condition for each measurement item. For example, it is necessary for the user to input numerical values for the design value, the upper limit value, and the lower limit value for each measurement item, which makes the setting work complicated. Further, there is a problem that an input error is likely to occur in such a setting work.

The present invention has been made in view of the above circumstances, and an object of the present invention is to facilitate the designation of determination conditions in a three-dimensional measuring device. Another object of the present invention is to suppress an input error of a determination condition in a three-dimensional measuring device.

The three-dimensional measuring device according to the first aspect of the present invention has a setting information storage unit that holds measurement items to be measured using geometric elements, and the geometry is indicated by indicating a position on a measurement object using a probe. A coordinate measuring unit that measures the coordinates of a measurement point corresponding to an element, a geometric element specifying unit that specifies the geometric element based on the coordinates of the measuring point and the type of the geometric element, and the specified geometric element. A measurement value calculation unit that calculates the measurement value of the measurement item based on the measurement value, a three-dimensional model reception unit that accepts the three-dimensional model corresponding to the measurement object, and the three-dimensional model corresponding to the specified geometric element. Judgment condition specification that extracts the design value or tolerance information of the model element from the three-dimensional model and specifies the judgment condition of the measurement item based on the design value or tolerance information. A unit and a determination unit for determining the quality of the measurement object based on the measured value and the determination condition are provided.

In the three-dimensional measuring device according to the second aspect of the present invention, in addition to the above configuration, the model element extraction unit corresponds to the geometric element selected from the two or more specified geometric elements. It is configured to extract elements.

In the three-dimensional measuring device according to the third aspect of the present invention, in addition to the above configuration, the model element extraction unit has the specified geometry among the two or more model elements corresponding to the specified geometric element. It is configured to extract one of the model elements based on the distance from the element.

In the three-dimensional measuring device according to the fourth aspect of the present invention, in addition to the above configuration, the model element extraction unit is on a three-dimensional model among two or more model elements corresponding to the specified geometric elements. It is configured to extract 1 said model element based on the position designation.

In the three-dimensional measuring device according to the fifth aspect of the present invention, in addition to the above configuration, the model element extraction unit extracts the model element from the two or more model elements corresponding to the specified geometric element. Is configured to be modifiable.

According to the present invention, it is possible to facilitate the designation of determination conditions in the coordinate measuring device. In addition, it is possible to suppress an input error of the determination condition in the three-dimensional measuring device.

It is a figure which showed one configuration example of the 3D measuring apparatus 1 by embodiment of this invention. It is a perspective view which showed an example of the detailed structure of the probe 110 of FIG. It is explanatory drawing about the method which the image pickup unit 105 detects the position and the posture of the probe 110. It is a flowchart which showed an example of the operation in a setting mode, and shows the procedure for generating the setting information. It is a flowchart which showed an example of the operation in a measurement mode. It is a flowchart which showed an example of the operation of the reference designation of a determination condition. It is a figure which showed an example of the judgment condition reference designation screen 2. It is a figure which showed an example of the judgment condition reference designation screen 2. It is a figure which showed an example of the judgment condition reference designation screen 2. It is a functional block diagram which showed the main functional composition of the measurement head 100 of FIG. It is a figure which showed an example of the detailed structure of the determination condition reference designation unit 524 of FIG.

(1) Three-dimensional measuring device FIG. 1 is a diagram showing a configuration example of the three-dimensional measuring device 1 according to the embodiment of the present invention. The three-dimensional measuring device 1 is a coordinate measuring device capable of measuring three-dimensional coordinates, and can measure the dimensions of an object to be measured and determine the quality of the measured value. The coordinate measuring device 1 includes a measuring head 100, a probe 110, an operation unit 120, and a processing device 130. Further, the measurement head 100 includes a housing 101, a mounting table 104, an image pickup unit 105, and a display unit 106.

The housing 101 is composed of an installation unit 102 installed on a horizontal installation surface, and a stand unit 103 extending upward from the rear end of the installation unit 102 and supporting the image pickup unit 105 and the display unit 106. Further, a mounting table 104 is provided at the front end of the installation portion 102. The mounting table 104 is a table on which the measurement object S is placed, and for example, an optical surface plate can be used.

The image pickup unit 105 is an image pickup means for detecting the position and orientation of the probe 110. By imaging a plurality of markers provided on the probe 110 with the imaging unit 105, the position and orientation of the probe 110 in the three-dimensional space are detected. The image pickup unit 105 is supported by the stand unit 103, and is arranged so as to overlook the mounting table 104 from an obliquely upward direction behind the mounting table 104. The image pickup unit 105 includes, for example, a condenser lens and a CMOS (complementary metal oxide semiconductor) image sensor, and can detect the incident angle of infrared rays. Therefore, it is possible to detect the incident direction of the infrared rays emitted from the plurality of light emitting portions provided in the probe 110, and to detect the position and orientation of the probe 110 in the three-dimensional space.

The display unit 106 is a display means that outputs a display to the user, for example, a liquid crystal display panel. The display unit 106 displays an operation screen, a captured image, a measurement result, and the like.

The probe 110 is a device that the user grasps and brings into contact with the measurement object S, and is connected to the measurement head 100 via a cable. By detecting the position and orientation of the probe 110 in a state where the probe 110 is in contact with the measurement object S on the mounting table 104, the coordinates of the measurement point on the measurement object S with which the probe 110 is in contact. Can be asked.

The operation unit 120 is an operation input means for the user to perform operation input, has a plurality of operation buttons, and is connected to the measurement head 100 via a cable. For example, when obtaining the coordinates of the measurement point on the measurement object S, the operation input using the operation unit 120 is performed. The operation unit 120 may be provided integrally with the probe 110.

The processing device 130 is a terminal device connected to the measurement head 100, and for example, a PC on which dedicated software is installed can be used. Further, the processing device 130 holds CAD data indicating a three-dimensional model corresponding to the measurement object S, and the CAD data can be read out to the measurement head 100.

FIG. 2 is a perspective view showing an example of the detailed configuration of the probe 110 of FIG. The probe 110 includes a housing portion 111, a grip portion 112, a light emitting portion 113, and a stylus 114. The upper end of the grip portion 112 is connected to substantially the center of the housing portion 111 in the longitudinal direction, and the probe 110 has a substantially T-shaped shape.

The light emitting unit 113 is a marker detected by the imaging unit 105. As the light emitting unit 113, a point light source that emits infrared rays, for example, an infrared LED that emits infrared rays having a wavelength of 860 nm can be used. A plurality of light emitting portions 113 are provided on the upper surface of the housing portion 111. In the figure, seven light emitting portions 113 are provided on the upper surface of the housing portion 111. These light emitting units 113 are arranged at different positions on the upper surface of the housing unit 111, and at least a part of the light emitting unit 113 is arranged at a height different from that of the other light emitting unit 113. Therefore, the position and orientation of the probe 110 can be detected by detecting the infrared rays from the light emitting unit 113 by the imaging unit 105.

The stylus 114 is a member that comes into contact with the object S to be measured. The stylus 114 is composed of a rod-shaped body protruding from the front end of the housing portion 111 and a spherical contact portion 115 provided at the tip thereof. By detecting the position and orientation of the probe 110 in a state where the contact portion 115 is in contact with the measurement point on the measurement object S, the coordinates of the measurement point can be obtained.

(2) Position and Posture of Probe 110 FIG. 3 is an explanatory diagram of a method in which the imaging unit 105 detects the position and posture of the probe 110. The imaging region V in the figure is defined as a certain region including the mounting table 104 and its surroundings, for example, a region protruding from the outer edge of the mounting table 104 by the total length of the probe 110.

The image pickup unit 105 is composed of an image pickup element 105a and a lens 105b, and has an angle of view θ capable of photographing the image pickup region V. Infrared light incident from the light emitting unit 113 in the image pickup region V passes through the principal point 105c of the lens 105b and forms an image at the light receiving position P on the image pickup element 105a. Therefore, based on the light receiving position P, the incident direction of the infrared rays, that is, the direction of the light emitting unit 113 as seen from the principal point 105c can be obtained.

Since the relative positional relationship of the plurality of light emitting units 113 is known, the position and orientation of the probe 110 in the three-dimensional space can be specified by detecting the directions of the plurality of light emitting units 113.

(3) Coordinates of measurement points The relative positional relationship between the light emitting unit 113 and the stylus 114 in the probe 110 is known. Therefore, if the position and posture of the probe 110 are specified, the position of the contact portion 115 can also be specified. Therefore, if the position and posture of the probe 110 are detected in a state where the contact portion 115 is in contact with the measurement point on the measurement object S, the position of the measurement point can be obtained.

However, the position of the contact portion 115 that can be obtained based on the position and orientation of the probe 110 is the center coordinate of the contact portion 115. On the other hand, since the measurement point is located on the outer peripheral surface of the contact portion 115, the coordinates of the measurement point obtained by the above method have an offset error corresponding to the radius of the contact portion 115. Therefore, by specifying the normal direction of the measurement object S at the measurement point and then performing offset correction in the normal direction, the coordinates of the measurement point can be obtained more accurately.

The normal direction of the object to be measured S can be obtained by specifying a geometric element described later. The geometric element is a geometric shape on the outer surface of the object S to be measured, and is specified by measuring a plurality of measurement points on the object S to be measured. Further, based on the posture of the probe 110 at the time of measurement of these measurement points, it is possible to specify which side of the two-dimensional geometric element the outer surface side of the measurement object S is. Therefore, if the geometric element is specified, the normal direction of the measurement object S at the measurement point can be obtained.

(4) Operation of the Three-dimensional Measuring Device 1 The three-dimensional measuring device 1 has two types of operation modes: a setting mode for generating setting information and a measurement mode for performing measurement based on the setting information. The measurement mode is used, for example, for product inspection in the production process of the measurement object S, and the setting mode is a mode for generating setting information to be used in the product inspection in advance.

In the setting mode, a measurement item related to the measurement of the physical quantity of the measurement object S is specified, and this measurement item is stored and retained as setting information. The measurement items include measurement conditions and determination conditions for physical quantities. On the other hand, in the measurement mode, the setting information generated in the setting mode is read out, the physical quantity of the measurement object S is measured based on the measurement items included in the setting information, and the measurement target is measured based on these measured values. The quality of the object S is determined.

The measurement condition is information that defines the physical quantity to be measured, and is associated with one or more geometric elements. The geometric element is a geometric shape defined as a part of the outer surface of the object S to be measured, and can be, for example, a point, a straight line, a plane, a circle, a cylinder, a cone, or a sphere. Physical quantities are measured using one or more geometric elements. For example, the distance or angle between two geometric elements, the length, angle, and other features of one geometric element can be specified as measurement conditions.

Specifically, when measuring the distance between two planes, two planes are designated as geometric elements. When measuring the distance between the center of a circle and a plane, a circle is designated as the first geometric element and a plane is designated as the second geometric element. When measuring the angle formed by a straight line and a plane, a straight line is designated as the first geometric element and a plane is designated as the second geometric element. When measuring the diameter, center position, or roundness of a circle, the circle is specified as the geometric element. When measuring the angle of inclination of the generatrix with respect to the central axis of the cone, the cone is specified as the geometric element.

The determination condition is a condition for determining the quality of the measured physical quantity. Judgment conditions consist of design values and tolerance information. The design value is a standard value to be compared with the measured value and is presented to the user together with the measured value. The tolerance information is a limit value to be compared with the measured value, and is composed of, for example, an upper limit value or a lower limit value, and a determination result is obtained by comparing the measured value with the upper limit value and the lower limit value. That is, when the measured value exceeds the upper limit value or the lower limit value, it is determined as NG (failure), and when the measured value is a value from the upper limit value to the lower limit value, it is determined as OK (pass).

The setting information can include two or more measurement items targeting one measurement object S. In this case, in the setting mode, setting items are specified for each physical quantity, and setting information including two or more setting items is generated. Further, in the measurement mode, the measurement is performed for each physical quantity based on the setting information, and the quality judgment is performed for each physical quantity. Further, based on the result of the quality determination regarding two or more measurement items, the comprehensive determination regarding the quality of the measurement object S is performed. For example, if the judgment result for any of the measurement items is NG, the comprehensive judgment is also NG, and if the judgment results for all the measurement items are OK, the comprehensive judgment is also OK.

Further, two or more measurement items included in the setting information can use the same or different geometric elements from each other. For example, the two measurement items may be the diameter of the same circle and the X coordinate of the center, or may be the diameters of different circles. That is, when the setting information includes two or more measurement items, the setting information can include one or two or more geometric elements.

(4-1) Operation in setting mode (generation of setting information)
Steps S101 to S108 of FIG. 4 are flowcharts showing an example of operation in the setting mode, and show a procedure for generating setting information using the measurement object S.

First, the measurement item is specified by the user (step S101). In this step, the type of one or more geometric elements used for measurement, that is, the type of geometric shape is specified, and the physical quantity to be measured using the geometric element is specified.

Next, the coordinates of one or more measurement points necessary for specifying the geometric element specified in step S101 are acquired (steps S102 and S103). The number of measurement points required to identify the geometric element is specified in order using the probe 110, the coordinates of these measurement points are acquired in order, and the geometric element is specified (step S104). For example, if the geometric element is a plane, the geometric element can be specified by acquiring the coordinates of three or more measurement points on the plane.

When two or more geometric elements are specified in step S101, steps S102 to S104 are repeated for the other geometric elements (step S105).

When all the geometric elements specified in step S101 are specified, the measured values of the designated measurement items are calculated and displayed using the geometric elements (step S106). Judgment information is specified for each measurement item while referring to this measured value (step S107). That is, the design value and the tolerance information are specified for each measurement item. Here, the design value and the tolerance information are specified by the numerical input of the user. In the case of a measurement item for which a measured value is obtained using one geometric element, the design value or tolerance information is extracted from the three-dimensional model without inputting numerical values, and the judgment condition is determined by referring to the extracted value. You can also specify it. The reference specification of the judgment condition will be described later.

When two or more measurement items are specified, steps S101 to S107 are repeated for the other measurement items, and setting information including the two or more measurement items is generated (step S108).

(4-2) Operation in Measurement Mode Steps S201 to S209 in FIG. 5 are flowcharts showing an example of operation in the measurement mode, and are procedures for measuring and determining the measurement object S based on the setting information. It is shown.

First, the setting information generated and stored in the setting mode is read out (step S201). That is, one or two or more measurement items are read out for one measurement object S.

First, in order to specify the geometric element included in the measurement condition of the first measurement item, the coordinates of the measurement point are acquired (steps S202 and S203). That is, the coordinates of one or more measurement points are sequentially acquired by using the probe 110 according to the measurement conditions. Then, if the coordinates of all the measurement points are acquired, the geometric element is specified (step S204).

When two or more geometric elements are specified in the measurement item, steps S202 to S204 are repeated for the other geometric elements (step S205).

When all the geometric elements specified in the measurement item are specified, the measured values corresponding to the measurement items are calculated based on the specified geometric elements (step S206). By comparing this measured value with the upper limit value and the lower limit value, a quality determination regarding the measured value is performed (step S207).

When two or more measurement items are included in the setting information, steps S202 to S207 are repeated for the other measurement items, measurement values are obtained for all the measurement items, and a quality determination is made (step S208). If the determination results are obtained for all the measurement items, a comprehensive determination is made regarding the quality of the measurement object S based on these determination results (step S209).

(5) Reference Designation of Judgment Conditions Steps S301 to S309 in FIG. 6 are flowcharts showing an example of the operation of reference designation of judgment conditions. The three-dimensional measuring device 1 can extract design values and tolerance information from the three-dimensional model of the measurement object S, and specify determination conditions for measurement items based on the extracted design values and tolerance information. This flowchart shows a procedure for designating a reference for such a determination condition, and is executed in the setting mode after the setting information is generated.

As described above, the determination condition can be numerically specified in the installation information generation procedure (step S107 in FIG. 4). The determination condition specified in this way can be updated by reference specification. It is also possible to confirm the validity of the determination conditions based on the design values and tolerance information extracted from the three-dimensional model. It should be noted that the specification of the judgment condition by a numerical value may be omitted, and only the reference specification may be performed.

First, the three-dimensional model corresponding to the measurement object S is read (step S301). The three-dimensional model is input from the processing device 130 to the measurement head 100 as CAD data, for example. CAD data is data that defines a three-dimensional model, and is composed of a large number of model elements that define the outer surface of the three-dimensional model. Model elements are defined as geometric shapes that form part of a 3D model. That is, the model element is composed of the type of the geometric shape and the numerical value for specifying the geometric shape. Numerical values associated with model elements can include design information and tolerance information.

When the three-dimensional model is read, the alignment with respect to the measurement object S is performed (step S302). This alignment is a coordinate conversion process for matching the coordinates of the three-dimensional model with the coordinates of the real space in which the measurement object S is arranged.

Next, any geometric element included in the setting information is selected (step S303). The user can select one geometric element from two or more geometric elements included in the setting information by using the operation unit 120.

When a geometric element is selected, the model element corresponding to the geometric element is extracted from the three-dimensional model (step S304). The model elements to be extracted are determined based on the type of geometric element selected. For example, a model element whose geometric element type matches the selected geometric element is selected.

If there are two or more model elements with the same geometric element type, one of the model elements is selected based on the position of the selected geometric element. For example, the model element closest to the selected geometric element can be extracted. Further, when the user specifies a position on the three-dimensional model, the model element closest to the specified position can be extracted. Further, based on the user operation, the next candidate element model can be extracted instead of the currently extracted model element. For example, it is possible to extract the model element that is the next closest to the selected geometric element.

When the model element is extracted, the design value and tolerance information corresponding to the model element are extracted from the three-dimensional model (step S305). The model element has one or more physical quantities, and the design values and tolerance information of these physical quantities are associated with each other. These design values and tolerance information are extracted and displayed in a list.

When changing the model element to be extracted, steps S304 and S305 are repeated (step S306). If the desired model element has not been extracted, for example, the user instructs the extraction of the next candidate, or the user specifies a new position on the three-dimensional model, so that the model element is extracted again. ..

Arbitrary design information and tolerance information are selected by the user from the extracted design values and tolerance information (step S307), and the selected design values and tolerance information can be specified as judgment conditions for measurement items (step). S308). The measurement item for which the determination condition is specified is the measurement item corresponding to the geometric element selected in step S303. It should be noted that at least one of the design value and the tolerance information can be selected and configured so that it can be specified.

When the setting information includes two or more geometric elements, steps S303 to S308 can be repeated for the geometric elements, all the geometric elements included in the setting information are sequentially selected, and the corresponding model elements are extracted. , Design values and tolerance information can be extracted from the three-dimensional model and specified as determination conditions (step S309).

By designating the design values and tolerance information extracted from the three-dimensional model as judgment conditions, it is possible to eliminate the complexity of numerical input or prevent input errors.

7 to 9 are diagrams showing an example of the determination condition reference designation screen 2. The determination condition reference designation screen 2 is a screen for designating a reference of the determination condition by the three-dimensional model, and is displayed on the display unit 106. The determination condition reference designation screen 2 is composed of a geometric element display unit 21, a measurement item display unit 22, a model image display unit 23, and a model information display unit 24.

The geometric element display unit 21 displays a list of one or more geometric elements included in the setting information. In the figure, one plane 001 and three circles 001 to 003 are listed as geometric elements. The user can select any geometric element from these geometric elements by operating the operation unit 120, and the selected geometric element is displayed with a highlight 21h. In the figure, the state in which the circle 002 is selected is shown.

The measurement item display unit 22 displays a list of measurement items corresponding to the selected geometric element. That is, one or two or more measurement items corresponding to the selected geometric element are displayed in a list in the geometric element display unit 21. In the figure, the diameter, roundness, center X coordinate, center Y coordinate, and center Z coordinate of the circle 002 are listed as measurement items.

The measurement item display unit 22 displays measured values, design values, and tolerance information for each measurement item. In the figure, a list of measurement items is displayed, each line corresponds to the measurement item, and a check column 22c is provided for each line. The measured value is a measured value calculated in the procedure for generating the setting information (step S106 in FIG. 4). The design value and the tolerance information are determination conditions specified in the setting information generation procedure (step S107 in FIG. 4), and the user can change them by inputting numerical values in the measurement item display unit 22. The check field 22c is an input field for selecting design values or tolerance information to be automatically input (posted) from the three-dimensional model, and the presence or absence of a check mark can be switched by user operation.

The model image display unit 23 is a display unit that displays an external image of a three-dimensional model, and model elements corresponding to the geometric elements selected in the geometric element display unit 21 are identifiablely displayed. In the figure, the model element corresponding to the circle 002 is extracted from the three-dimensional model, highlighted as the symbol 231 on the image of the three-dimensional model, and annotated with "Circle 002".

The model information display unit 24 displays design values and tolerance information of physical quantities corresponding to the extracted model elements. In the figure, the diameter, the X coordinate of the center, the Y coordinate of the center, the Z coordinate of the center, and the radius are extracted from the three-dimensional model as the physical quantities of the circle 002, and the respective design values and tolerance information are displayed. Further, by selecting the tabs 241,242 in the model information display unit 24, the design value or the tolerance information is selectively displayed.

FIG. 7 is a diagram showing a state in which the tab 241 of design values is selected and a list of design values is displayed in the model information display unit 24. In the list of design values, each row corresponds to a physical quantity, the type of the physical quantity and the design value are displayed for each row, and a check column 24c is provided. The check column 24c is an input column for selecting a design value to be automatically input (posted) in the list of the measurement item display unit 22, and the presence or absence of the check mark can be switched by a user operation.

Further, the model information display unit 24 is provided with a setting button 24b for referencing and designating a design value. If the setting button 24b is operated in the state of FIG. 7, the design value of the row selected by the check column 24c in the list of design values is selected by the check column 22c in the list of measurement items. It is automatically posted as the design value of the line. When two or more check boxes 22c and 24c are selected, the physical quantities are posted so as to match.

FIG. 8 is a diagram showing a state in which the tolerance information tab 242 is selected and a list of tolerance information is displayed in the model information display unit 24. In the list of tolerance information, each row corresponds to a physical quantity, the type of the physical quantity, the upper limit value and the lower limit value are displayed for each row, and a check column 24c is provided. The check column 24c is an input field for selecting tolerance information to be automatically input (posted) in the list of the measurement item display unit 22, and the presence or absence of the check mark can be switched by a user operation.

In the state of FIG. 8, if the setting button 24b for referencing and designating the tolerance information is operated, the tolerance information of the row selected by the check column 24c in the tolerance information list is the measurement item list. Of these, it is automatically posted as the tolerance information of the line selected by the check column 22c. When two or more check boxes 22c and 24c are selected, the physical quantities are posted so as to match.

FIG. 9 shows a state when an erroneous model element is extracted as a circle 002. The circle 002 is the outer edge shape of the upper surface opening of the through hole on the right front side. In FIG. 7, the upper surface opening is extracted as a model element corresponding to the circle 002, and the symbol 231 is displayed on the model image display unit 23. At the same time, the physical quantity of the model element is displayed on the model information display unit 24. On the other hand, in FIG. 9, the lower surface opening of the through hole is extracted as a model element corresponding to the circle 002, the symbol 232 is displayed on the model image display unit 23, and the model information display unit 24 is concerned with the symbol 232. The physical quantity of the model element is displayed. That is, the wrong model element has been extracted.

In this case, if the user moves the cursor 233 in the model image display unit 23 and specifies an arbitrary position on the three-dimensional model, the model element closest to the specified position is newly extracted. In the figure, by designating the position near the upper surface opening of the through hole on the front right side, the upper surface opening can be extracted as a new model element, and the state shown in FIG. 7 can be reached.

Further, the user can extract different model elements by operating the "next candidate" button 23b in the model image display unit 23. In the case of FIG. 9, the upper surface opening is extracted as a model element in which the type of the geometric element is a circle and the distance from the center position is the next closest to the lower surface opening, and the state shown in FIG. 7 can be reached.

If the types of geometric elements are the same and there are two or more model elements located close to each other, an erroneous model element may be extracted as the model element corresponding to the selected geometric element. Even in such a case, the model element can be extracted again to extract other model elements. Therefore, the correct model element can be easily extracted.

(6) Functional Configuration of Measurement Head 100 FIG. 10 is a functional block diagram showing a main functional configuration of the measurement head 100 of FIG. The measurement head 100 includes an image pickup unit 105, a measurement item reception unit 501, a setting information storage unit 502, a coordinate measurement unit 511, a geometric element identification unit 512, a measurement value calculation unit 513, a determination unit 514, a three-dimensional model reception unit 521, and coordinates. It includes a conversion unit 522, a three-dimensional model storage unit 523, and a determination condition reference designation unit 524.

The measurement item receiving unit 501 is a means for receiving the designation of the measurement item. The measurement items include measurement conditions and determination conditions. Further, the measurement conditions include the type of the geometric element and the designation of the physical quantity to be measured using the geometric element, and the determination condition includes the design value and the tolerance information. The measurement item is specified by the user using the operation unit 120. The received measurement items are stored in the setting information storage unit 502.

The setting information storage unit 502 is a storage means for storing measurement items. The type of the geometric element is received by the measurement item receiving unit 501, and is specified by the geometric element specifying unit 512 in the setting mode.

The image pickup unit 105 is a means for photographing the light emitting unit 113 of the probe 110, and detects the position and orientation of the probe 110 based on the photographed image.

The coordinate measurement unit 511 obtains the coordinates of the contact portion 115 of the probe 110 based on the position and orientation of the probe 110, and obtains the coordinates of the measurement point on the measurement object S instructed by the probe 110.

The geometric element specifying unit 512 specifies a geometric element based on the coordinates of the measurement point obtained by the coordinate measuring unit 511 and the type of the geometric element held by the setting information storage unit 502.

The measured value calculation unit 513 calculates the measured value from the geometric element specified by the geometric element specifying unit 512 based on the measurement item held by the setting information storage unit 502. The measured value calculated in the setting mode is stored in the setting information storage unit 502, and the measured value calculated in the measurement mode is output to the determination unit 514.

The determination unit 514 determines the quality of the measurement object S based on the measurement value obtained by the measurement value calculation unit 513 in the measurement mode and the determination condition held in the setting information storage unit 502. For example, a good / bad judgment is made by comparing the measurement conditions with the upper limit value and the lower limit value.

The three-dimensional model receiving unit 521 is a means for receiving the three-dimensional model of the measurement object S. The data file of the three-dimensional model is held in the processing device 130, and the file selected by the user is received by the three-dimensional model reception unit 521. The coordinate conversion unit 522 is a means for performing coordinate conversion of the received three-dimensional model. The three-dimensional model storage unit 523 is a means for storing the three-dimensional model, and holds the three-dimensional model after the coordinate conversion.

The determination condition reference designation unit 524 extracts design values and tolerance information from the three-dimensional model in the three-dimensional model storage unit 523 based on the user operation, and determines the measurement items held in the setting information storage unit 502. It is stored in the setting information storage unit 502 as a condition. If the judgment condition is already stored, the judgment condition is updated.

FIG. 11 is a diagram showing an example of the detailed configuration of the determination condition reference designation unit 524 of FIG. The determination condition reference designation unit 524 is composed of a geometric element selection unit 601, a model element extraction unit 602, a determination condition extraction unit 603, and a determination condition designation unit 604.

The geometric element selection unit 601 is a means for selecting an arbitrary geometric element included in the setting information based on the user operation. The selected geometric element is the geometric element corresponding to the measurement item that is the target of the reference designation of the determination condition. The geometric element selection unit 601 reads the setting information from the setting information storage unit 502, and one of the geometry of one or more geometric elements corresponding to one or more measurement items included in the setting information. Select an element.

The model element extraction unit 602 is a means for extracting model elements from a three-dimensional model. The extracted model element is a model element corresponding to the geometric element selected by the geometric element selection unit 601. The model element extraction unit 602 extracts any one of the model elements from a large number of model elements constituting the three-dimensional model in the three-dimensional model storage unit 523. For example, the model element having the same type of geometric element and the closest position to the selected geometric element is extracted. Extraction of model elements is performed by selecting geometric elements. Further, if the user instructs the extraction of the next candidate, other model elements are selected. Further, if the user specifies a position on the three-dimensional model, model elements close to the position are extracted.

The determination condition extraction unit 603 extracts design values and tolerance information from the three-dimensional model. The extracted design values and tolerance information are design values and determination information of one or more physical quantities associated with the model elements extracted by the model element extraction unit 602.

The determination condition designation unit 604 designates the design value and the tolerance information extracted by the determination condition extraction unit 603 as the determination condition of the measurement item. The determination condition designation unit 604 designates the extracted design value and tolerance information selected by the user as the determination condition of the measurement item, and stores the information in the setting information storage unit 502. At this time, the target measurement item is one or two or more measurement items associated with the geometric element designated by the geometric element selection unit 601 and is selected by the user. Further, the user can also specify whether to specify the design value or the tolerance information as the determination condition.

In the above embodiment, an example of the three-dimensional measuring device 1 in which the light emitting unit 113 of the probe 110 is photographed by using the imaging unit 105 to measure the position on the measurement object S has been described, but the application target of the present invention is. , Not limited to such an optical coordinate measuring device. For example, the present invention can be applied to a gate-type or arm-type three-dimensional measuring device.

1 Coordinate-measuring device 100 Measuring head 105 Imaging unit 106 Display unit 110 Probe 113 Light emitting unit 114 Stylus 115 Contact unit 120 Operation unit 130 Processing device 2 Judgment condition reference specification screen 21 Geometric element display unit 22 Measurement item display unit 23 Model image display Unit 24 Model information display unit 501 Measurement item reception unit 502 Setting information storage unit 511 Coordinate measurement unit 512 Geometric element identification unit 513 Measurement value calculation unit 514 Judgment unit 521 Three-dimensional model reception unit 522 Coordinate conversion unit 523 Three-dimensional model storage unit 524 Judgment condition reference specification unit 601 Geometric element selection unit 602 Model element extraction unit 603 Judgment condition extraction unit 604 Judgment condition specification unit S Measurement target

Claims (5)

A setting information storage unit that holds measurement items to be measured using geometric elements,
A coordinate measurement unit that measures the coordinates of the measurement point corresponding to the geometric element by instructing the position on the measurement object using a probe.
A geometric element specifying part that specifies the geometric element based on the coordinates of the measurement point and the type of the geometric element,
A measurement value calculation unit that calculates the measurement value of the measurement item based on the specified geometric element, and a measurement value calculation unit.
A 3D model reception unit that accepts a 3D model corresponding to the measurement object,
A model element extraction unit that extracts model elements of the three-dimensional model corresponding to the specified geometric element, and a model element extraction unit.
A judgment condition designation unit that extracts the design value or tolerance information of the model element from the three-dimensional model and specifies the judgment condition of the measurement item based on the design value or tolerance information.
A three-dimensional measuring device including a determination unit that determines the quality of the measurement object based on the measured value and the determination condition. The three-dimensional measuring device according to claim 1, wherein the model element extraction unit extracts the model element corresponding to the geometric element selected from the two or more specified geometric elements. The model element extraction unit is characterized in that one of the two or more model elements corresponding to the specified geometric element is extracted based on the distance from the specified geometric element. The three-dimensional measuring device according to claim 1. The model element extraction unit is characterized in that one of the two or more model elements corresponding to the specified geometric element is extracted based on the designation of the position on the three-dimensional model. Item 1. The three-dimensional measuring device according to Item 1. The three-dimensional according to claim 3 or 4, wherein the model element extraction unit can change the model element to be extracted from the two or more model elements corresponding to the specified geometric element. measuring device.

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