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. 18, 1994
Filed:
Mar. 25, 1992
Louis P Gonzalez, Dammartin en Goele, FR;
Christian G Courtois, Hameua de Mocquesouris both of, FR;
Renishaw Metrology Limited, Gloucestershire, GB;
Abstract
A radio transmission system for a touch trigger probe for machine tools or coordinate measuring machines. In the transmitter shown in FIG. 1, a 1 kHz oscillator produces a signal which is phase modulated by an electronic switch and an inverter, when electrical contacts within the probe change state. This phase modulated signal is mixed in a mixer with an unmodulated 500 Hz reference signal, produced in a divider from the oscillator, so that there is a precise phase relationship between the two signals. The receiver shown in FIG. 2 has filters which separate out the 500 Hz reference signal and the phase modulated 1 kHz signal. A decoder phase demodulates the 1 kHz signal, using the 500 Hz signal as a reference in order to increase the reliability of the resulting signal.