Layered unit provided with piezoelectric ceramics, method for producing the same, and ink jet printing head employing the same

  • US 6,626,526 B2
  • Filed: 07/27/2001
  • Issued: 09/30/2003
  • Est. Priority Date: 07/27/2000
  • Status: Active Grant
First Claim
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1. A layered unit provided with piezoelectric ceramics comprising:

  • a first member made of piezoelectric ceramics;

    a second member which is placed on the first member; and

    an adhesive layer which is formed between the first member and the second member to adhere the first member and the second member, wherein a joint surface of the first member to be jointed to the second member is formed with a multitude of recesses formed by shedding of crystalline grains following breaks in grain boundaries between crystalline trains of the piezoelectric ceramics of the first member, a surface area ratio of the recesses relative to a total surface area of the joint surface being 50% or more.

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