Piezoelectric element and injector using the same
AssigneeDenso Corporation
InventorsKazuhide Sato, Ryonosuke Tera, Naoyuki Kawazoe
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Abstract
A piezoelectric element and an injector using the same piezoelectric element are disclosed, which are so high in reliability as not to be shorted even in a high humidity environment, are small in size, are low in cost and are high in heat radiation capability. The piezoelectric element comprises a ceramic laminate (10) including a plurality of ceramic layers of a piezoelectric ceramic (11) and a plurality of internal electrode layers (21, 22), stacked alternately. At least an organic insulating layer (41) of an organic material is formed on at least a part of the surface of the ceramic laminate (10), and at least an inorganic insulating layer (42) of an inorganic material is formed on the organic insulating layer (41).
Claims14
A piezoelectric element comprising:
- a ceramic laminate including a plurality of ceramic layers of a piezoelectric ceramic and a plurality of internal electrode layers stacked alternately, wherein the ceramic laminate is disposed for displacement along the stacking direction thereof and has end surfaces in the stacking direction thereof for transmitting said displacement to other parts as operating end surfaces;
- at least an organic insulating layer of an organic material formed on at least a part of the surface of said ceramic laminate, wherein the organic insulating layer is formed more thickly on longitudinal side surfaces of the ceramic laminate than on the end surfaces thereof;
- and at least an inorganic insulating layer of an inorganic material formed on said organic insulating layer, wherein the inorganic insulating layer covers at least the surface of the organic layer.
A piezoelectric element comprising an organic insulating layer composed of an organic material including at least selected one of natural rubber, isoprene, butadiene, silicone, urethane, chroloprene, acryl, isobutylene and a fluoro group.
Dependencies are inferred from the claim text.