Title:
【発明の名称】信号伝送装置
Document Type and Number:
Japanese Patent JP3126797
Kind Code:
B2
Abstract:
A radio transmission system for a touch trigger probe (10) for machine tools or coordinate measuring machines is described. In the transmitter shown in Fig 1, a 1kHz oscillator (16) produces a signal which is phase modulated by an electronic switch (14) and an inverter (28), when electrical contacts (11) within the probe (10) change state. This phase modulated signal is mixed in a mixer (24) with an unmodulated 500Hz reference signal, produced in a divider (18) from the oscillator (16), so that there is a precise phase relationship between the two signals. The receiver shown in Fig 2 has filters (38, 42) which separate out the 500Hz reference signal and the phase modulated 1kHz signal. A decoder (44) phase demodulates the 1kHz signal, using the 500Hz signal as a reference in order to increase the reliability of the resulting signal.
Inventors:
Gonzales, Louis Philibert
Courtoix, Christian Georges Julien
Courtoix, Christian Georges Julien
Application Number:
JP7474692A
Publication Date:
January 22, 2001
Filing Date:
March 30, 1992
Export Citation:
Assignee:
Renishaw Metallurgy Limited
International Classes:
B23Q17/20; G01B7/00; G01B7/012; G01B21/04; G08C15/04; G08C25/00; B23Q17/22; (IPC1-7): G01B21/04; B23Q17/20; G01B7/00; G08C15/04; G08C25/00
Domestic Patent References:
| JP6266103A |
Attorney, Agent or Firm:
Yoshikazu Tani (1 person outside)