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Safety Photoelectric Switch

  • US 20100194583A1
  • Filed: 12/22/2009
  • Published: 08/05/2010
  • Est. Priority Date: 01/31/2009
  • Status: Active Grant
First Claim
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1. An optical scanning type photoelectric switch, which performs two-dimensional scanning with light projection pulse to detect an object, and also measures a distance to the object to sense a two-dimensional position of the object, the switch having:

  • a storage device for accepting and storing a change in a light projection period of the light projection pulse, a scanning period for scanning with the light projection pulse or a phase of the light projection pulse with respect to the light projection period;

    a light projection/reception controlling device for controlling light projection/reception based upon the light projection period or the scanning period stored in the storage device; and

    a safety signal output controlling device for switching a safety signal from a permission signal to a non-permission signal when light reflected by the object is received and it is determined that a position of the object is inside a protection area at least twice in succession.

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