piezoelectric sensor
A piezoelectric sensor and piezoelectric sheet technology, which can be used in the measurement of fluid pressure using piezoelectric devices, the measurement of property forces using piezoelectric devices, and piezoelectric/electrostrictive/magnetostrictive devices. The piezoelectricity of the electric sheet is reduced, and the water vapor cannot be diffused and removed, so as to achieve the effect of easy electrical connection and excellent piezoelectricity
Active Publication Date: 2018-04-20
SEKISUI CHEM CO LTD
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Problems solved by technology
Once the solvent or residual monomer penetrates into the piezoelectric sheet, the piezoelectric sheet constituting the piezoelectric sensor of Patent Document 1 is sealed by the fixing agent as described above, and the solvent or residual monomer that has penetrated into the piezoelectric sheet cannot be released. Diffusion and removal of residual monomers to the outside of the piezoelectric sheet results in a decrease in the piezoelectricity of the piezoelectric sheet
[0008] In addition, as the adhesive constituting the fixing agent, acrylic adhesives are often used. Since acrylic adhesives are polar, acrylic adhesives tend to contain water vapor, and water vapor may pass through the fixing agent. In this case, the water vapor permeated into the piezoelectric sheet cannot be diffused and removed outside the piezoelectric sheet, and the piezoelectricity of the piezoelectric sheet will decrease.
Method used
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Embodiment Construction
[0074] An example of the piezoelectric sensor of the present invention will be described with reference to the drawings. Such as Figure 1~5 As shown, the piezoelectric sensor A has: a piezoelectric sheet 11, a first ground electrode 12 laminated and integrated on the first surface of the piezoelectric sheet 11, and a signal electrode 13 laminated and integrated on the second surface of the piezoelectric sheet 11 . The integrated second ground electrode 14 is laminated on the above-mentioned signal electrode 13 .
[0075] The piezoelectric sheet 11 is not particularly limited as long as it is a sheet capable of generating charges on its surface by applying an external force (a sheet having a piezoelectric phenomenon). As the piezoelectric sheet 11, for example, a piezoelectric sheet obtained by imparting polarization to a synthetic resin sheet (synthetic resin foamed sheet or synthetic resin non-foamed sheet), a piezoelectric sheet obtained by dispersing an inorganic piezoele...
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The piezoelectric sensor of the present invention has: a piezoelectric sheet; a first ground electrode, which is laminated and integrated on the first surface of the piezoelectric sheet, and has a first cutout; a signal electrode, which is formed on the first surface of the piezoelectric sheet. The two sides are laminated and integrated, and have a third cutout; the second ground electrode, which is laminated and integrated on the above-mentioned signal electrode in a state of being electrically insulated from the above-mentioned signal electrode, and has a second cutout, the above-mentioned signal electrode, the above-mentioned first The cutouts of the first ground electrode and the second ground electrode overlap each other at least in part in the thickness direction of the piezoelectric sheet, and the cutouts of the signal electrode, the first ground electrode, and the second ground electrode overlap each other. The portion of the piezoelectric sheet that is exposed at the portions overlapping each other in the thickness direction of the piezoelectric sheet is defined as an exposed portion.
Description
technical field [0001] The present invention relates to a piezoelectric sensor capable of maintaining excellent piezoelectricity over a long period of time Background technique [0002] A biosignal sensor using a piezoelectric sheet as a sensor is known. When the pressure generated by pulse wave, respiration, and physical activity is applied to the piezoelectric sheet, an electrical signal corresponding to the pressure will be generated by the piezoelectric sheet, and the biological signal can be detected by using the electrical signal. [0003] Patent Document 1 discloses a piezoelectric sensor that includes a piezoelectric body made of a polymer material, a first electrode bearing portion that is placed on one side of the piezoelectric body and that carries a signal electrode on a first insulator, and that is placed on a first insulator. The other side of the piezoelectric body and the second electrode bearing portion that supports the ground electrode on the second insul...
Claims
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IPC IPC(8): G01L1/16H10N30/87H10N30/30
CPCG01P15/09H10N30/875H10N30/87H10N30/302G01L9/08
Inventor 神谷信人八田文吾冈林赏纯森本直之玉井义昭
Owner SEKISUI CHEM CO LTD