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Variable frequency vibratory alert method and structure

  • US 5,436,622 A
  • Filed: 07/06/1993
  • Issued: 07/25/1995
  • Est. Priority Date: 07/06/1993
  • Status: Expired due to Term
First Claim
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1. A method of generating a vibratory alert for vibrating a portable alerting device, said method of generating the vibratory alert, comprising the steps of:

  • a first step of driving the vibration frequency of the vibratory alert at a first frequency for vibrating the portable device at a resonant vibrating frequency dependent on a position of the portable device;

    determining the resonant vibrating frequency of the portable device dependent on the position of the portable device in response to and after said first step of driving; and

    a second step of driving the vibratory alert at the resonant vibrating frequency determined in said step of determining the resonant vibrating frequency of the portable device.

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