Coordinate measuring device

• US 9,551,566 B2
• Filed: 04/29/2015
• Issued: 01/24/2017
• Est. Priority Date: 05/30/2014
• Status: Active Grant

• Current Assignee: Keyence Corporation (Keyence)
• Original Assignee: Keyence Corporation (Keyence)
• Inventors: Wakai, Tatsuro
• Primary Examiner(s): FULTON, CHRISTOPHER W
• Application Number:
  US14/698,871
• Publication Number:
  US 20150345932A1
• Time in Patent Office: 636 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G01B 11/007 feeler heads therefor
• CPC Class Codes: G01B 21/047 Accessories, e.g. for positioning, for tool-setting, for measuring probes

Abstract

Provided is a coordinate measuring device which can easily perform accurate measurement. A coordinate measuring device is provided with a sub-imaging unit, a display unit, and a probe. The probe includes a stylus. The stylus has a contact part that is brought into contact with a measurement target in order to measure the measurement target. The sub-imaging unit is provided in the probe so as to have constant positional relationships, and captures an image of at least part of the measurement target. The image of the measurement target obtained by the sub-imaging unit is displayed as a captured image on the display unit. Based on calculated positions of the probe and the positional relationships of the sub-imaging unit, an image showing a measurement position on the measurement target, with which the contact part is to be brought into contact, is displayed on the captured image.

Claims

1. A coordinate measuring device comprising:

a probe having a contact part configured to contact with a measurement target in order to measure a physical quantity of the measurement target contacted by the contact part;

a first imaging unit configured to capture an image of at least part of the measurement target;

a position and attitude acquiring unit configured to acquire a position and an attitude of the probe and a position and an attitude of the first imaging unit;

a display unit configured to display, as a captured image, the image of at least part of the measurement target obtained by the first imaging unit; and

a control unit configured to control the display unit to display, on the captured image, a first indicator showing a measurement position to be contacted by the contact part on the measurement target, based on the position and the attitude of the probe and the position and the attitude of the first imaging unit obtained by the position and attitude acquiring unit.

2. The coordinate measuring device according to claim 1, wherein

the control unit is configured to be operable in a setting mode and a measurement mode, the setting mode for generating setting information that includes a measurement condition and a measurement procedure for measuring a physical quantity of the measurement target, the measurement mode for measuring the physical quantity of the measurement target, and

the first indicator is displayed on the captured image in the measurement mode based on the setting information generated by the setting mode.

3. The coordinate measuring device according to claim 2, further comprising

a storage unit,

wherein the control unit stores the setting information generated by the setting mode into the storage unit, and reads the setting information stored in the storage unit in the measurement mode, and

the first indicator is displayed on the captured image based on the setting information read in the measurement mode.

4. The coordinate measuring device according to claim 3, further comprising

an interface part in which the setting information is inputted into and outputted from the storage unit.

5. The coordinate measuring device according to claim 2, wherein

the setting information includes captured image data generated by capturing an image of at least part of the measurement target which includes a measurement position by the first imaging unit in the setting mode, and

the control unit has the captured image displayed on the display unit based on the captured image data in the measurement mode.

6. The coordinate measuring device according to claim 2, wherein in the measurement mode, the control unit controls the display unit to display a second indicator showing a progress level of measurement of the physical quantity of the measurement target based on the measurement procedure for the setting information.

7. The coordinate measuring device according to claim 2, wherein the control unit is configured to be operable in a single item measurement mode for measuring the physical quantity of the measurement target without using the setting information in a state where the first indicator is not displayed on the captured image.

8. The coordinate measuring device according to claim 2, wherein

the storage unit stores a result of the measurement by the measurement mode, and

the control unit is configured to be operable in a statistical analysis mode for performing a statistical analysis process based on the measurement result stored in the storage unit.

9. The coordinate measuring device according to claim 2, wherein

the position and attitude acquiring unit calculates coordinates of a contact position between the measurement target and the contact part based on the acquired position and attitude of the probe, to measure the physical quantity of the measurement target based on a result of the calculation, and

the control unit sets a reference coordinate system in which an arbitrary portion of the measurement target is taken as a reference by measurement of a previously set specific physical quantity of the measurement target, and controls the position and attitude acquiring unit to measure the physical quantity of the measurement target in the set reference coordinate system.

10. The coordinate measuring device according to claim 9, wherein

the setting information includes a measurement condition and a measurement procedure for measuring the specific physical quantity, and

the first indicator is displayed on the captured image such that the specific physical quantity is measured in the measurement mode.

11. The coordinate measuring device according to claim 1, wherein

the coordinate measuring device includes an acquirement possible region in which the position and the attitude of the probe and the position and the attitude of the first imaging unit can be acquired by the position and attitude acquiring unit, and

the control unit controls the display unit to display a virtual image virtually representing the acquirement possible region viewed from an arbitrary position, and display on the virtual image at least one of the first indicator and a third indicator showing a position of the contact part.

12. The coordinate measuring device according to claim 11, further comprising

an operation unit configured to be operated for changing a viewpoint position for viewing the acquirement possible region,

wherein, when an operation for changing the viewpoint position is performed by the operation unit in a state where the captured image is displayed on the screen of the display unit, the control unit controls the display unit to display a virtual image at the time of viewing the acquirement possible region from an imaging position of the first imaging unit for obtaining the captured image in place of the captured image, and thereafter successively changes the virtual image such that a position for viewing the acquirement possible region moves from the imaging position to the changed viewpoint position.

13. The coordinate measuring device according to claim 1, wherein

the probe has a plurality of markers,

the first imaging unit is provided in the probe to have constant positional relationships with respect to the plurality of markers,

the position and attitude acquiring unit includes a second imaging unit that is fixed to a previously set imaging position and captures images of the plurality of markers of the probe, and a calculation unit that respectively calculates positions of the plurality of markers based on image data showing the images of the plurality of markers obtained by the second imaging unit, and

the control unit controls the display unit to display the first indicator on the captured image based on the positions of the plurality of markers calculated by the calculation unit and the positional relationships of the first imaging unit with respect to the plurality of markers.