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1. (EP2087535) ÉLÉMENT PIÉZOELECTRIQUE MULTICOUCHES ET APPAREIL D'INJECTION EMPLOYANT CELUI-CI
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique
Claims

1. A multi-layer piezoelectric element comprising:

a stack having a plurality of piezoelectric layers (5) and a plurality of metal layers (7), the piezoelectric layers and the metal layers being stacked one on another;

a pair of external electrodes (11) formed on the side faces of the stack,

wherein at least one of the plurality of metal layers is a stress relieving layer (7b) having a plurality of partial metal layers (71) and voids (72), the partial metal layers are scattered between two piezoelectric layers sandwiching the stress relieving layer in the direction of stacking, and

wherein a plurality of junction sections (5a) are formed between said two piezoelectric layers to join said two piezoelectric layers with each other, the junction sections (5a) being disposed on both sides of an imaginary straight line (L) which is drawn so as to connect the center in the direction of width of one of the external electrodes (11) and the center in the direction of width of the other of the external electrodes in a plane that includes the stress relieving layer (7b) and is perpendicular to the stacking direction.


  2. The multi-layer piezoelectric element according to claim 1, wherein the pair of external electrodes (11) are disposed at the position where the plane is divided into two equal parts by the imaginary straight line (L).
  3. The multi-layer piezoelectric element according to claim 2, wherein the junction sections are disposed along a straight line (L2) which is perpendicular to the imaginary straight line (L) and passes the center of the imaginary straight line.
  4. The multi-layer piezoelectric element as in one of claims 1 to 3, wherein the junction sections (5a) are disposed along the side faces of the stack.
  5. The multi-layer piezoelectric element as in one of claims 1 to 4, wherein the plurality of partial metal layers (71) are separated by the voids (72) so as to be electrically insulated from each other.
  6. The multi-layer piezoelectric element as in one of claims 1 to 5, wherein the stress relieving layer (7b) is disposed in plurality in the stacking direction of the stack.
  7. The multi-layer piezoelectric element according to claim 6, wherein the plurality of stress relieving layers (7b) are disposed via a plurality of piezoelectric layers.
  8. The multi-layer piezoelectric element according to claim 6, or 7 wherein the plurality of stress relieving layers (7b) are disposed in regular arrangement in the stacking direction of the stack.
  9. The multi-layer piezoelectric element according to any one of claims 1 to 8, wherein the stress relieving layer (7b) is constituted mainly from silver.
  10. An injection apparatus comprising a container which has an injection hole and the multi-layer piezoelectric element described in any one of claims 1 to 9, wherein a liquid held in the container is discharged from the injection hole by the operation of the multi-layer piezoelectric element.