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Self-limiting electrical triggering for initiating fracture of frangible glass

  • US 10,026,579 B2
  • Filed: 07/26/2016
  • Issued: 07/17/2018
  • Est. Priority Date: 07/26/2016
  • Status: Active Grant
First Claim
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1. A transient electronic device including:

  • a frangible glass substrate;

    one or more electronic elements disposed on the frangible glass substrate such that fracturing of the frangible glass substrate causes fracturing of the electronic elements; and

    a trigger mechanism comprising;

    a self-limiting resistive element comprising a resistive material disposed over a localized region of said frangible glass substrate, the self-limiting resistive element comprising first and second resistor structures; and

    a switch element coupled to the self-limiting resistive element, wherein said self-limiting resistive element is configured such that;

    during a first time period after said switch element is actuated to initiate a trigger current from a power source through said self-limiting resistive element, heat generated by said self-limiting resistive element increases a localized temperature of said localized region from an initial temperature toward a first temperature level, anda current limiting portion of said self-limiting resistive element, comprising a fuse element connected between the first and second resistor structures, independently controls the flow of said trigger current such that said trigger current flow is terminated when said localized temperature of said localized region reaches said first temperature level, thereby causing said localized temperature to decrease from said first temperature level to a second temperature level,wherein said frangible glass substrate is configured such that a stress profile generated in said localized region by a thermal pulse comprising said thermal increase and said thermal decrease is sufficient to produce an initial fracture force in said localized region.

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