Denso Corporation

Threebond Co., Ltd.

Shinichi Okamoto

Hiroaki Asano

Akira Fujii

Yoichi Kobane

Kazuhide Sato

Akihisa Kurokawa

Yasutoshi Nogami

Yuka Taniguchi

Takanori Wachi

A waterproof case for automobile components includes: a case body part that includes a storage space for housing an object and an opening connecting to the storage space; and a lid part that is configured to be attached to the case body part to close the opening. A seal material (made of an adhesive silicone gel is interposed between the case body part and the lid part. An acceptance part is provided in at least one of the case body part and the lid part. An engagement convex part is configured to be locked in the acceptance part at a position corresponding to the acceptance part in the case body part and the lid part.

Waterproof case for automobile components

A laminated piezoelectric element according to the present invention includes a plurality of unit laminates and a plurality of adhesive layers. The unit laminates are stacked together. Each of the unit laminates includes a plurality of piezoelectric ceramic layers and a plurality of internal electrode layers that are alternately laminated with the piezoelectric ceramic layers in the lamination direction of the unit laminate. Each of the adhesive layers is formed between adjacent two of the unit laminates to bond the two unit laminates together. Further, each of the adhesive layers has a thickness of 1 &#x3bc;m or less and an adhesive strength of 1.3 MPa or higher.

Laminated piezoelectric element including adhesive layers having small thickness and high adhesive strength

The present invention provides a piezoelectric actuator with excellent durability. In the present invention, a piezoelectric elementin which a plurality of piezoelectric layers that expand in accordance with an applied voltage, and internal electrode layers for supplying an applied voltage, are alternately laminated, and at least a part of the side surfacesandthereof is covered by an external packaging resin, the piezoelectric elementbeing housed in a sealed containerthat substantially isolates it from the external atmosphere, and in which the internal atmosphereis replaced by an inert gas. Alternatively, the piezoelectric elementis housed in a sealed containerthat substantially isolates it from the external atmosphere, and the external packaging resinincludes an antioxidant.

Piezoelectric actuator

A laminated piezoelectric element () having a ceramic laminate () formed by alternatively laminating a plurality of piezoelectric layers () and a plurality of internal electrode layer (). A side surface () provided with the first side-surface electrode () is further provided with first recessed groove portions () which are the recessed grooves exposing the ends of the second internal electrodes () in the bottom portions () thereof, and a side surface () provided with the second side-surface electrode () is further provided with second recessed groove portions () which are the recessed grooves exposing the ends of the first internal electrodes () in the bottom portions. The first groove portions () and the second groove portions () are filled with an insulating filler material () having electrically insulating property so as to cover the ends of the second internal electrodes () and the ends of the first internal electrodes (). The insulating filler material () comprises an insulating resin () having electrically insulating property and inorganic particles () of an inorganic material contained in the insulating resin ().

Growing community of inventors

Kariya, Japan

Shinichi Okamoto