Optical coordinate measuring device

• US 9,778,023 B2
• Filed: 03/18/2015
• Issued: 10/03/2017
• Est. Priority Date: 04/18/2014
• Status: Active Grant

• Current Assignee: Keyence Corporation (Keyence)
• Original Assignee: Keyence Corporation (Keyence)
• Inventors: Osaki, Michio, Usami, Jun
• Primary Examiner(s): Smith, R. A.
• Application Number:
  US14/660,959
• Publication Number:
  US 20150300808A1
• Time in Patent Office: 930 Days
• Field of Search: 33 1 CC, 33503, 33504, 25055922, 356 2, 356 3, 356601-612
• CPC Class Codes: G01B 11/005 coordinate measuring machines
• CPC Class Codes: G01B 11/24 for measuring contours or curvatures

Abstract

Provided is an optical coordinate measuring device with improved measurement efficiency. A holding part of a measurement head includes an installation part and a stand part. The installation part has a horizontal flat shape and is installed on an installation surface. The stand part is provided so as to extend upward from one end of the installation part, and a placement table is provided at the other end of the installation part. The main imaging unit is provided on an upper part of the stand part. The main imaging unit is configured detachably with respect to the stand part. The main imaging unit is fixed by the stand part in a constant attitude so as to capture an image of a previously set imaging region.

Claims

1. An optical coordinate measuring device comprising:

a probe configured to designate a measurement position, and having a plurality of markers;

an imaging unit configured to capture an image of the plurality of markers;

a fixing member designed to fix the imaging unit in a predetermined constant attitude such that the imaging unit captures an image of a predetermined imaging region, wherein the imaging unit is detachable with respect to the fixing member; and

a calculation unit configured to calculate a coordinate point of a measurement position designated by the probe in the predetermined imaging region based on the plurality of markers in the image captured by the imaging unit fixed in the predetermined constant attitude by the fixing member, and configured to determine geometric characteristics based on the coordinate point of the measurement position designated by the probe and a geometric shape including at least one of a plane, a cylinder and a sphere.

2. The optical coordinate measuring device according to claim 1, wherein the fixing member fixes the imaging unit so as to capture an image of a region obliquely below the imaging unit.

3. The optical coordinate measuring device according to claim 1, further comprising:

a placement table on which a measurement target is placed; and

a base which holds the placement table,

wherein the fixing member is fixed to the base, and

the imaging unit captures an image of a region on the placement table as the imaging region.

4. The optical coordinate measuring device according to claim 1, wherein the imaging unit includes a first storage unit which stores first calibration information indicating characteristics of the imaging unit.

5. The optical coordinate measuring device according to claim 1, wherein the probe is connected to the calculation unit by wire or wirelessly.

6. The optical coordinate measuring device according to claim 5, wherein

the probe has

a grip part which is provided so as to extend in a first direction, and is gripped by a user, and

a body part which is provided at an upper end of the grip part so as to extend in a second direction, the second direction forming an angle with respect to the first direction,

the plurality of markers are provided on an upper surface of the body part, and

a contact part to be brought into contact with the measurement target is provided at an end of the body part.

7. The optical coordinate measuring device according to claim 1, wherein the probe includes a second storage unit which stores second calibration information indicating characteristics of the probe.

8. An optical coordinate measuring device comprising:

a probe configured to designate a measurement position, and having a plurality of markers;

an imaging unit configured to capture an image of the plurality of markers;

a fixing member designed to fix the imaging unit in a predetermined constant attitude such that the imaging unit captures an image of a predetermined imaging region, wherein the imaging unit is detachable with respect to the fixing member;

a first storage unit, disposed in the imaging unit, which stores first calibration information indicating characteristics of the imaging unit;

a second storage unit, disposed in the probe, which stores second calibration information indicating characteristics of the probe; and

a calculation unit configured to calculate a coordinate point of a measurement position designated by the probe in the predetermined imaging region based on the first calibration information indicating characteristics of the imaging unit, the second calibration information indicating characteristics of the probe, and the plurality of markers in the image captured by the imaging unit fixed in the predetermined constant attitude by the fixing member.

9. The optical coordinate measuring device according to claim 8, wherein the fixing member fixes the imaging unit so as to capture an image of a region obliquely below the imaging unit.

10. The optical coordinate measuring device according to claim 8, further comprising:

a placement table on which a measurement target is placed; and

a base which holds the placement table, wherein the fixing member is fixed to the base, and the imaging unit captures an image of a region on the placement table as the imaging region.

11. The optical coordinate measuring device according to claim 8, wherein the probe is connected to the calculation unit by wire or wirelessly.

12. The optical coordinate measuring device according to claim 11, wherein the probe has a grip part which is provided so as to extend in a first direction, and is gripped by a user, and a body part which is provided at an upper end of the grip part so as to extend in a second direction, the second direction forming an angle with respect to the first direction, the plurality of markers are provided on an upper surface of the body part, and a contact part to be brought into contact with the measurement target is provided at an end of the body part.