-
公开(公告)号：US20190057816A1
公开(公告)日：2019-02-21
申请号：US16074807
申请日：2017-02-03
摘要： The present invention provides an electret sheet that retains high piezoelectricity under high-temperature condition. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a volume resistivity of 1.0×1015 Ω⋅cm or more at 25° C. and a dielectric breakdown voltage of 7 kV or more at 25° C. The electret sheet preferably having a volume resistivity of 1.0×1014 Ω⋅cm or more at 37° C. and a dielectric breakdown voltage of 7 kV or more at 37° C. retains excellent piezoelectricity even after being left under a high-temperature atmosphere over a long period.
-
公开(公告)号：US20230000394A1
公开(公告)日：2023-01-05
申请号：US17781835
申请日：2020-12-02
发明人： Yasuyuki SHIRASAKA , Tetsuhiro KATOU , Taehyung CHO , Yuuta KATSURAYAMA , Ryousuke TAKAHASHI , Yuri HIRONO
摘要： A state determination method, a state determination device, a state determination system, and a recording medium are provided for determining a state of a living body based on electrical signal according to a detected vibration. A state determination device 2 acquires electrical signal according to a detected vibration, and operates: a rectification unit (step S2); an envelope detection unit to derive an envelope from the rectified electrical signal (step S3); and a state determination unit to determine the state of the living body based on the derived envelope (step S4). The state determination device 2 that has determined the state of the living body outputs a determination result (step S5).
-
公开(公告)号：US20210249195A1
公开(公告)日：2021-08-12
申请号：US17243856
申请日：2021-04-29
摘要： The present invention provides an electret sheet that exhibits excellent piezoelectricity even by light stress. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a compressive elastic modulus of 80 to 300 MPa when compressively deformed at 25° C. and a 50% compression stress of 120 to 300 kPa at 25° C., and thus has the excellent piezoelectricity for light stress and exhibits the excellent piezoelectricity even by light stress (0.5 N or less) caused by a pulse wave or a breathing.
-
公开(公告)号：US20210280770A1
公开(公告)日：2021-09-09
申请号：US16330424
申请日：2017-09-06
IPC分类号： H01L41/113 , H01L41/193 , H01L41/047 , H01L41/083 , G01L1/16
摘要： The present invention provides a piezoelectric sensor that has elastic properties in a surface direction thereof, and can smoothly follow stretching of a body to be measured to accurately measure movement of the body to be measured, and detect movement in a surface direction of a surface of the body to be measured on which the piezoelectric sensor is disposed. The piezoelectric sensor of the present invention includes: a piezoelectric sheet including a porous synthetic resin sheet; a signal electrode layer that is layered on a surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties; and a ground electrode layer that is layered on another surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties.
-
公开(公告)号：US20210257165A1
公开(公告)日：2021-08-19
申请号：US17270664
申请日：2019-08-23
IPC分类号： H01G7/02 , H01L41/193
摘要： The present invention provides an electret sheet that has excellent durability against a pressing force that is repetitively applied, that is, excellent compression recovery properties, and can suppress stuffiness even when used by attaching it to the skin of a human body. The electret sheet of the present invention has an air permeability of 10 to 1,000 sec/100 mL. Thus, the electret sheet has excellent durability against a pressing force that is repetitively applied, that is, excellent compression recovery properties, and can suppress stuffiness even when used by attaching it to the skin of a human body.
-
公开(公告)号：US20190043672A1
公开(公告)日：2019-02-07
申请号：US16074803
申请日：2017-02-03
摘要： The present invention provides an electret sheet that exhibits excellent piezoelectricity even by light stress. The electret sheet of the invention is characterized by including a charged porous sheet, in which the electret sheet has a compressive elastic modulus of 80 to 300 MPa when compressively deformed at 25° C. and a 50% compression stress of 120 to 300 kPa at 25° C., and thus has the excellent piezoelectricity for light stress and exhibits the excellent piezoelectricity even by light stress (0.5 N or less) caused by a pulse wave or a breathing.
-
-
-
-
-
搜索结果
6 条记录 (耗时 0.011 秒)