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Optical isolator mounted in printed circuit board recess

  • US 10,075,246 B2
  • Filed: 09/26/2013
  • Issued: 09/11/2018
  • Est. Priority Date: 09/26/2013
  • Status: Active Grant
First Claim
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1. An optical isolator comprising:

  • a printed circuit board having an intrinsically safe first surface that meets an intrinsically safe specification of field devices such that even under fault conditions, circuitry on the intrinsically safe first surface cannot itself ignite a volatile environment, and a second surface on an opposite side from the intrinsically safe first surface, the printed circuit board having a recess extending only partially therethough, the recess defined by sidewalls that terminate at an end surface such that the end surface is separated from the intrinsically safe first surface by the sidewalls;

    a first photoelement having an active surface, the first photoelement being mounted to the printed circuit board;

    a second photoelement having an active surface, the second photoelement being mounted at least partially in the recess; and

    wherein the end surface is interposed between the active surface of the first photoelement and the active surface of the second photoelement such that light emitted from the active surface of one of the first and second photoelements that passes into the end surface is detected at the active surface of the other of the first and second photoelements.

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