Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Piezoelectric stack

一种压电层、叠体的技术，应用在涂层、电路、压电器件/电致伸缩器件等方向，达到抑制衰减、电荷保持量高、电荷保持性优异的效果

Inactive Publication Date: 2015-07-01
NIPPON VALQUA IND LTD +1
View PDF18 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the above-mentioned Patent Documents 1 to 5, the difference in elastic modulus between the porous resin sheet and the layer laminated on the porous resin sheet is not studied.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Piezoelectric stack
  • Piezoelectric stack
  • Piezoelectric stack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0311] [Example 1] A laminate in which a surface coating layer is provided on both the front and back sides of a porous resin sheet (single-side covered piezoelectric laminate)

[0312]

[0313] 100g of fluororesin (FEP, NP101 manufactured by Daikin Industries) (thermal decomposition start temperature: 400°C; electrical conductivity: 1.0×10 -16 S / cm; MFR: 24g / 10 minutes (ASTMD2116); Melting point: 255°C (ASTMD2116); Apparent density 1.21g / ml (JISK6891)) is mixed with 4.3g of hollow glass beads (Potters-Ballotini company) as hollow particles System, 60P18, conductivity: 1.0×10 -14 S / cm). The hollow rate of the mixture was 10%.

[0314] The calculation of the hollow ratio is performed as follows.

[0315] Hollow rate (volume%) = ((volume A - volume B) / volume A) × 100

[0316] Volume A: Calculated volume based on material weight and material specific gravity (absolute specific gravity)

[0317] Volume B: The volume calculated based on the weight of the material and the s...

Embodiment 2

[0334] [Example 2] A laminate in which a surface coating layer is provided on both surfaces of a porous resin sheet (a double-sided covered piezoelectric laminate)

[0335]

[0336] 18.6 g of hollow glass beads (iM30K, manufactured by Sumitomo 3M Corporation) were mixed with 100 g of fluororesin (FEP, NP-101 manufactured by Daikin Industries, Ltd.). The hollow rate of the mixture was 30%. The hollow ratio was measured by the same method as in Example 1. The resulting mixture was molded in the same manner as in Example 1 to obtain a 3 cm x 3 cm x 0.2 mm sheet (porous resin sheet).

[0337]

[0338] A fluororesin sheet (PFA film "AF0025" manufactured by Daikin Industries, Ltd., 25 μm, volume resistivity 1.0 × 10 18 Ω·cm) were press-bonded by hot stamping at 300° C. at a pressure of 2 MPa for 180 seconds to form a laminate (piezoelectric laminate). The modulus of elasticity was measured in the same manner as in Example 1, and the piezoelectric coefficient was measured in t...

Embodiment 3

[0343] [Example 3] A laminate in which a surface covering layer is provided on both sides of a porous resin sheet formed of a PTFE nonwoven fabric (a double-sided PTFE nonwoven fabric piezoelectric laminate)

[0344]

[0345] According to the electrospinning method described in Japanese Patent Publication No. 2012-515850, polytetrafluoroethylene (PTFE) fibers are gathered into a sheet to produce a PTFE nonwoven fabric with a thickness of 60 μm (porosity 80%, elastic modulus Weight 6MPa) formed porous resin sheet.

[0346]

[0347] The porosity is measured based on the following method.

[0348] The table is calculated using the weight of a test piece obtained by cutting the porous resin sheet into a 4 cm square (4 cm in the vertical direction and 4 cm in the horizontal direction) and the thickness measured by the microcal (LITEMATIC VL-50, manufactured by Mitsutoyo Co., Ltd.). The apparent density is used to calculate the porosity by the following mathematical formula.

...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical resistivityaaaaaaaaaa
diameteraaaaaaaaaa
porosityaaaaaaaaaa
Login to View More

Abstract

A piezoelectric stack having a porous resin sheet and a surface-coating layer stacked on the front and / or back surface of the porous resin sheet, which are the outside surfaces of the surface-coating layer, the volume resistivity of the surface-coating layer being at least 1 × 1013 Ω•cm, and the porous resin sheet and the surface-coating layer having different degrees of elasticity.

Description

technical field [0001] The present invention relates to a piezoelectric laminate having a surface coating layer having a volume resistivity of a specific value or higher on at least one surface of a porous resin sheet, and a piezoelectric sheet usable for the piezoelectric laminate. Background technique [0002] Research on piezoelectric materials using porous organic materials (porous organic piezoelectric materials). For example, EMFIT Corporation (Finland) offers a piezoelectric sheet using a porous polypropylene material. [0003] The sheet has a structure with independent pores uniformly distributed throughout the sheet. However, there is a problem that the value of the piezoelectric coefficient gradually decreases as time elapses. The above phenomenon is considered to be caused by the gradual neutralization or attenuation of polarized charges held in adjacent porous structures. [0004] Several mechanisms of charge decay in porous organic piezoelectric-like material...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01G7/02H01L41/08H01L41/09H01L41/193
CPCH01G7/02H01L41/45H01L41/193H01L41/0533H01G7/028H10N30/883H10N30/852H10N30/857H10N30/092H10N30/098D06N3/0006D06N3/0011D06N3/0056D06N3/047D06N2201/029D06N2203/044D06N2205/20D06N2209/04D06N2213/02
Inventor 米田哲也山中幸田实佳郎
Owner NIPPON VALQUA IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com