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Unidirectional flexure type tuning fork crystal vibrator

  • US 4,468,584 A
  • Filed: 02/09/1982
  • Issued: 08/28/1984
  • Est. Priority Date: 10/01/1976
  • Status: Expired due to Term
First Claim
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1. A flexure type crystal vibrator comprising:

  • a crystal body including at least a first branch and a second branch;

    electrode means deposited on the first and second branches of said crystal body;

    driving means for applying a unidirectional electric field to the branches of said crystal body via the electrode means to create a first electric field and a second electric field in said first branch and said second branch, respectively, said electric fields being directed in substantially one direction and varying in strength along said one direction;

    said first and second branches include a top wall means, bottom wall means, an inner wall means, and an outer wall means;

    first top wall electrode means deposited on said top wall means of said first branch;

    first bottom wall electrode means, electrically connected to said first top wall electrode means, deposited on said bottom wall means of said first branch;

    second outer wall electrode means electrically connected to said first top wall electrode means and said first bottom wall electrode means, deposited on said outer wall means of said second branch;

    second top wall electrode means deposited on said top wall means of said second branch;

    second bottom wall electrode means, electrically connected to said second top wall electrode means, deposited on said bottom wall means of said second branch; and

    first outer wall electrode means, electrically connected to said second top wall and said second bottom wall electrode means, deposited on said outer wall means of said first branch, each of said wall electrode means occupying a surface area on said wall means of the first and second branches, the surface areas being approximately equal.

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