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DEVICE FOR THE ELECTRONIC RECORDING OF THE INSTANTANEOUS LOCATION OF A SENSING PROBE ON THE SURFACE OF A PLATE

  • US 3,808,364 A
  • Filed: 03/30/1972
  • Issued: 04/30/1974
  • Est. Priority Date: 03/30/1971
  • Status: Expired due to Term
First Claim
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1. A piezoelectric sensing device for continuously registering the location of a moving probe over a surface which comprises a plate of piezoelectric material having an area of the surface over which the probe is to be selectively moved, said area having at least two edges angularly oriented with respect to each other, electrodes located at said edges on said surface over which said probe is to be moved, electrode means substantially covering the underside of said plate, whereby electrode pairs are provided by said first mentioned electrodes and said underside electrode, said probe having an electrode formed in its tip, whereby a probe electrode pair is provided by said probe and said underside electrode, means for electrically pulsing said probe electrode to provide a mechanical wave train in said plate, connection lines for transmitting the pulses piezoelectrically produced in said edge located electrode pairs to a registering and storage device.

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