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Three-dimensional shape measuring device and three-dimensional shape measuring sensor

  • US 5,381,235 A
  • Filed: 12/15/1992
  • Issued: 01/10/1995
  • Est. Priority Date: 12/26/1991
  • Status: Expired due to Fees
First Claim
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1. A three-dimensional shape measuring device, comprising:

  • a light source for scanning plane light over the surface of an object;

    an optical system for forming an image of a bright line appearing on the surface of an object;

    a plurality of shape measurement units, each shape measurement unit including an image sensor opposed to the object and;

    defining a pixel, a capacitor having a first grounded terminal and a second terminal, discharging means connected to the capacitor for gradually discharging the capacitor from when plane light scanning starts until the bright line image passes through the pixel, the discharging means having

         1) a discharge resistor including a first grounded terminal and a second terminal and

         2) a plurality of interconnected discharge switching transistors, one of the discharge switching transistors having a gate and being connected to the second terminal of the discharge resistor and the second terminal of the capacitor; and

    an arithmetic logic means for computing charges remaining in said plurality of capacitors after plane light scanning is completed thus providing a three-dimensional shape of an object.

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