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:
Oct. 15, 1991
Filed:
Apr. 07, 1989
Applicant:
Inventor:
David K Thomas, Dursley, GB;
Assignee:
Renishaw plc, , GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B / ; G08C / ;
U.S. Cl.
CPC ...
33503 ; 33558 ; 34087011 ; 340680 ; 34082558 ;
Abstract
Probes (18A, 18B, 18C) can be interchangeably mounted in the spindle (12) of a machine tool. Each probe has an optical signal transmission system, in which an optical signal from a light emitting diode (24) is transmitted to a receiving photodiode (26). To prevent interference between the different probe signals, each probe modulates the emitted light at a different carrier frequency. The receiver (28) contains electronic bandpass filters to separate out the different carrier frequencies. The signal information is encoded onto the optical signal by phase modulation of the carrier frequency.