The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 1995
Filed:
Jul. 27, 1994
Mun Sang Kim, Seoul, KR;
Korea Institute of Science and Technology, Seoul, KR;
Abstract
A calibration system for compensating variation of robot arm length of an industrial robot because of temperature change. The system comprises a temperature variation insensible calibration jig having a pair of rectangular hexahedrons of different sizes which are combined with each other above and below and have a plurality of measuring points marked thereon. A noncontact sensor unit relatively measures a teach-in measuring point of the calibration jig and compares the measured value of the teach-in point with initially inputted value thereof, thereby calculating the variation of the robot arm length caused by the temperature change. The noncontact sensor unit includes a camera for measuring a center of the teach-in measuring point and a laser displacement sensor (LDS) for measuring relative distance between the robot hand and the teach-in measuring point and sensing three-dimensional relative error. The arm length variation is calculated, using differential value between the initially inputted value and the measured value of the teach-in measuring point, in accordance with the method of least squares.