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:
Jan. 30, 2001
Filed:
Jul. 25, 1997
Peter G. Lloyd, Bristol, GB;
Peter K. Hellier, North Nibley, GB;
David R. McMurtry, Wotton-Under-Edge, GB;
Renishaw PLC, Gloucestershire, GB;
Abstract
A touch trigger probe incorporates piezoelectric sensors , whose outputs are processed by an interface circuit. The interface circuit discriminates between signals generated from the piezoelectric sensors as a result of machine vibration and those generated as a result of a genuine measurement event, by the use of a timing circuit . The timing circuit compares the time intervals (t -t );(t -t ) between attainment of first and second , and second and third output signal levels from the sensor , and upon the basis of this comparison validates (or rejects) measurements made with the probe. Additionally, the interface determines whether measurements made with the probe are taken upon the basis of outputs generated by the sensors due to a shock wave in the stylus of the probe, or as a result of strain in the stylus ; as an alternative, measurements may be made only on the basis of strain.