Measuring device for an optical measuring system

• US 10,036,628 B2
• Filed: 09/25/2017
• Issued: 07/31/2018
• Est. Priority Date: 09/30/2016
• Status: Active Grant

• Current Assignee: Carl Zeiss Industrielle Messtechnik GmbH (Carl-Zeiss-Stiftung)
• Original Assignee: Carl Zeiss Industrielle Messtechnik GmbH (Carl-Zeiss-Stiftung)
• Inventors: Held, Tobias, Kaufmann, Dieter
• Primary Examiner(s): Punnoose, Roy M
• Application Number:
  US15/714,023
• Publication Number:
  US 20180094914A1
• Time in Patent Office: 309 Days
• Field of Search: 356620
• CPC Class Codes: G01B 11/002 for measuring two or more coordinates
• CPC Class Codes: G01B 11/007 feeler heads therefor
• CPC Class Codes: G01B 5/016 Constructional details of contacts
• CPC Class Codes: G01B 5/20 for measuring contours or curvatures
• CPC Class Codes: G06T 2207/30204 Marker
• CPC Class Codes: G06T 7/73 using feature-based methods

Abstract

A measuring device for an optical measuring system, comprising a rigid body which comprises a probe body or a tool and on which a first optical marker is arranged. The measuring device further comprises a holding part for holding the measuring device by hand or for clamping the measuring device in a machine. At least a second optical marker is arranged on the holding part. Still further, the measuring device comprises a spring element which connects the rigid body to the holding part.

Claims

1. Measuring device for an optical measuring system, comprising:

a rigid body which comprises a probe body or a tool, wherein a first optical marker is arranged on the rigid body;

a holding part for holding the measuring device by hand or for clamping the measuring device in a machine, wherein at least a second optical marker is arranged on the holding part; and

a spring element which connects the rigid body to the holding part.

2. Measuring device according to claim 1, wherein the first optical marker comprises at least three optical marker elements arranged on the rigid body.

3. Measuring device according to claim 2, wherein the optical marker elements are passive optical marker elements which are arranged in one common plane.

4. Measuring device according to claim 1, wherein the rigid body is substantially rod-shaped, wherein the first optical marker is arranged at a first position which is arranged closer to a first end of the rigid body than to a second end of the rigid body, said second end being opposite said first end, wherein the probe body or the tool is arranged at a second position which is arranged closer to said second end than to said first end, and wherein the spring element engages the rigid body between said first position and said second position.

5. Measuring device according to claim 1, wherein the probe body comprises a probe sphere or probe tip.

6. Measuring device according to claim 1, wherein the spring element comprises a spring parallelogram or a cardan spring element.

7. Measuring device according to claim 1, wherein the measuring device comprises a damping element which connects the rigid body to the holding part.

8. Measuring device according to claim 7, wherein the rigid body is connected to the holding part solely via the spring element and the damping element.

9. Measuring device according to claim 7, wherein the damping element comprises a magnetic damper, a fluidic damper, or an elastomeric damper.

10. Measuring system comprising:

a measuring device having;

(i) a rigid body which comprises a probe body or a tool, wherein a first optical marker is arranged on the rigid body,

(ii) a holding part for holding the measuring device by hand or for clamping the measuring device in a machine, wherein at least a second optical marker is arranged on the holding part, and

(iii) a spring element which connects the rigid body to the holding part,

a camera for capturing image data of the measuring device; and

an evaluation and control unit, which is configured to evaluate the image data captured by the camera and to determine position data of the measuring device based on said image data.

11. Measuring system according to claim 10, wherein the evaluation and control unit is configured to use the image data captured by the camera to determine position data of the rigid body, which describe a position of the rigid body, based on the first optical marker, and to determine position data of the holding part, which describe a relative position of the holding part relative to the rigid body, based on the first and second optical markers.

12. Measuring system according to claim 11, wherein the evaluation and control unit is configured to calculate a force which is applied to the probe body or the tool, based on the position data of the holding part and a stiffness of the spring element.

13. Measuring system according to claim 12, wherein the evaluation and control unit is configured to determine position data of the probe body, which describe a position of the probe body, based on the position data of the rigid body, and wherein the evaluation and control unit is configured determine a correction vector based on the calculated force, and to determine corrected position data of the probe body based on the position data of the probe body and the correction vector.

14. Measuring system according to claim 12, wherein the measuring system further comprises an optical, acoustic or haptic actuator, and wherein the evaluation and control unit is configured to control the actuator to generate an optical, acoustic or haptic signal when the calculated force exceeds a first threshold value or drops below a second threshold value.

15. Measuring system according to claim 12, wherein the measuring system further comprises a data memory unit, wherein the evaluation and control unit is configured to store the position data of the probe body in the data memory unit each time a predefined movement characteristic is detectable based on the position data of the holding part, and/or each time the calculated force exceeds a predefined threshold value.

16. Measuring system according to claim 10, wherein the first optical marker comprises at least three optical marker elements arranged on the rigid body.

17. Measuring system according to claim 10, wherein the rigid body is substantially rod-shaped, wherein the first optical marker is arranged at a first position which is arranged closer to a first end of the rigid body than to a second end of the rigid body, said second end being opposite said first end, wherein the probe body or the tool is arranged at a second position which is arranged closer to said second end than to said first end, and wherein the spring element engages the rigid body between said first position and said second position.

18. Measuring system according to claim 10, wherein the probe body comprises a probe sphere or probe tip.

19. Measuring system according to claim 10, wherein the measuring device comprises a damping element which connects the rigid body to the holding part.

20. Measuring device according to claim 19, wherein the rigid body is connected to the holding part solely via the spring element and the damping element.