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Wrist-pendent wireless optical keyboard

  • US 6,097,374 A
  • Filed: 03/06/1998
  • Issued: 08/01/2000
  • Est. Priority Date: 03/06/1997
  • Status: Expired due to Term
First Claim
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1. A method of detecting at least one of a presence and absence of a human digit or prosthetic appendage of a wrist or other suitable appendage of a user within a specific temporal region defined in fixed relation to the wrist or other suitable appendage, comprising the steps of:

  • (a) defining a plane in which an array of optical sources affixed to the wrist direct narrow light beams intersectable angles to an array of substantially narrow beamwidth optical detectors positioned at in fixed relation to the optical sources producing a matrix;

    (b) individually exciting each of the optical sources with a distinct waveform and respectively independently detecting by each of the optical detectors responsive thereto as detected waveforms;

    (c) evaluating each of the detected waveforms for correlation with each of the distinct waveforms to determine at least one of a presence and absence of a reflection of the distinct waveforms, and producing correlation results responsive thereto;

    (d) analyzing the correlation results for each of the optical detectors and the optical sources respectively, within the matrix to determine at least one valid key closure; and

    (e) encoding the at least one valid key closure into at least one standard computer keyboard scancode.

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