A School Corporation Kansai University

Murata Manufacturing Co., Ltd.

Mitsui Chemicals, Inc.

Teijin Limited

Kansai University

Panasonic Intellectual Property Management Co., Ltd.

Sumitomo Electric Industries, Limited

Sekisui Chemical Co., Ltd.

Valqua, Ltd.

The School Corporation Kansai University

Teijin Frontier Co., Ltd.

A School of Corporation Kansai University

Osaka Organic Chemical Industry Co., Ltd.

Yoshiro Tajitsu

Mitsunobu Yoshida

Masamichi Ando

Yuhei Ono

Shunsuke Kanematsu

Tetsuo Yoshida

Kazuhiro Tanimoto

Kenichi Goto

Tomoyoshi Yamamoto

Atsuko Kato

Satoshi Yamasaki

Taizo Nishimoto

Hitoshi Onishi

Masahiko Mitsuzuka

Suguru Ozawa

Shunsuke Fujii

Satoko Yoshizaki

Masanobu Ajioka

Yukihiro Shimasaki

Takayuki Watanabe

Hiroki Takeoka

Masamichi Andoh

Jun Sugawara

Shigeo Nishikawa

Satoshi Kuretake

Michio Eriguchi

Akihiko Uchiyama

Ichiro Fujio

Shingo Kaimori

Shinichi Usugi

Takazumi Okabayashi

Takeharu Isaki

Takayuki Onogi

Tomoya Matayoshi

Masaki Shimizu

Tetsuya Komeda

Takeshi Karino

Kazuho Uchida

Yuzo Nakamura

Tomoka Yoshimura

Takaharu Isaki

Yoshiaki Aso

Yuki Yamanaka

An electretized film of the present invention includes a cyclic olefin polymer, in which the electretized film is a non-porous film, and a piezoelectric constant din a thickness direction, which is measured by applying a pressing force to the electretized film in the thickness direction, under conditions of a load of 0.5 N, a dynamic load of &#xb1;0.25 N, a frequency of 110 Hz, a temperature of 23&#xb0; C., and a humidity of 50%, is equal to or more than 100 pC/N.

Electretized film and electronic device

Provided is a piezoelectric structure including a braid composed of a conductive fiber and piezoelectric fibers, the braid being a covered fiber having the conductive fiber as the core and the piezoelectric fibers covering the periphery of the conductive fiber, wherein the covered fiber has at least one bent section, and when the piezoelectric structure is placed on a horizontal surface, the height from the horizontal surface to the uppermost section of the piezoelectric structure is greater than the diameter of the covered fiber.

Piezoelectric structure and device using same

A structure includes an oriented piezoelectric polymer arranged in a circular tubular or circular columnar shape, wherein the orientation angle of the piezoelectric polymer with respect to the central axis of the structure is 15&#xb0; to 75&#xb0;, the piezoelectric polymer includes a crystalline polymer having an absolute value of 0.1 to 1000 pC/N for the piezoelectric constant d14 when the orientation axis is the third axis, and the piezoelectric polymer includes a P-body containing a crystalline polymer with a positive piezoelectric constant d14 value and an N-body containing a crystalline polymer with a negative value, wherein for the portion of the central axis of the structure having a length of 1 cm, the value of T1/T2 is 0 to 0.8, T1 being the smaller and T2 being the larger of (ZP+SN) and (SP+ZN), where ZP, SP, ZN, and SN are particularly defined masses.

Structure for use in piezoelectric element, braided piezoelectric element, fabric-like piezoelectric element using braided piezoelectric element, and device using these

Provided is a piezoelectric laminate element that outputs a fixed output voltage even in response to a static load for which an output voltage could not be obtained using a conventional piezoelectric element. A piezoelectric laminate body in which a plurality of piezoelectric polymer film layers consisting of film such as polylactic acid film that exhibits piezoelectricity in the planar direction are laminated is used as a piezoelectric laminate element. The piezoelectric laminate body is given a cylindrical shape, rounded rectangle shape, or other partially curved shape. The output voltage follows the increase and decrease of the applied load, and if a fixed load is continuously applied, a fixed output voltage is continuously output, and a piezoelectric laminate element is obtained that outputs a fixed output voltage even if a load is static.

Piezoelectric laminate element, and load sensor and power supply using same

Provided is a configuration capable of improving the signal strength of a piezoelectric element using piezoelectric fibers. This braided piezoelectric element comprises a core comprising conductive fibers and a sheath comprising braided piezoelectric fibers so as to cover the core, the braided piezoelectric element further comprising a metal terminal connected and fixed to the core in either of the following states A or B. A) A state where a portion of the metal terminal grasps a fiber portion constituting the end of a braided piezoelectric element and the core and the metal terminal are electrically connected to each other and fixed within 1 mm from where the metal terminal grasps the fiber portion. B) A state where: a portion of the metal terminal has a fork or needle shape; the fork-shaped or needle-shaped portion is electrically connected to the core while in contact with the sheath; and the braided piezoelectric element is secured to the metal terminal by another portion of the metal terminal or a component fixed to the metal terminal within 10 mm from the point of the electrical connection.

Braided piezoelectric element, fabric-like piezoelectric element using braided piezoelectric element, and device using same

A piezoelectric stack includes a porous resin sheet, and a surface coating layer disposed on an exterior surface of the porous resin sheet, the exterior surface including at least one of a front surface and a back surface of the porous resin sheet, the surface coating layer having a volume resistivity of not less than 1&#xd7;10&#x3a9;&#xb7;cm, the porous resin sheet and the surface coating layer having different elastic moduli.

Piezoelectric stack

The purpose of the present invention is to provide a fibrous piezoelectric element which enables a large electric signal to be drawn out by stress produced by relatively small deformation. A piezoelectric element includes a braid composed of a conductive fiber and a piezoelectric fiber. In the braid, the conductive fiber is a core, and the piezoelectric fiber is a covering fiber that covers the periphery of the conductive fiber.

Piezoelectric element and device using same

The photoelastic polyurethane resin has a Young's modulus at 25&#xb0; C. of 2 to 5 MPa, a photoelastic constant at 25&#xb0; C. of 1000&#xd7;10Pato 100000&#xd7;10Pa, and a glass transition temperature of &#x2212;60&#xb0; C. to &#x2212;21&#xb0; C.

Photoelastic polyurethane resin, detection member, robot, and method for producing photoelastic polyurethane resin

The cushioning material having a sensorincludes a resin sheetcomposed of photoelastic resin, a cushioning materiallaminated on the resin sheet, a photosensorincluding a light generating unitand a light receiving unitthat are disposed to face each other so as to sandwich the resin sheet, and a processorthat detects a stress applied to the resin sheetbased on the light signal detected by the photosensor

Cushioning material having sensor, and bed

A piezoelectric device is provided that includes a polymer piezoelectric material having at least one film-like layer; a first electric conductor provided on a principal surface of the polymer piezoelectric material; a second electric conductor provided on a surface of the polymer piezoelectric material at an opposite side from the first electric conductor on the principal surface; a first end surface electric conductor provided on one end surface in a width direction of the polymer piezoelectric material and disposed so as to be conductively connected to the first electric conductor and so as not to be in contact with the second electric conductor; and a second end surface electric conductor provided on any other end surface that is not the one end surface of the polymer piezoelectric material and disposed in a defined manner.

Piezoelectric device and process for producing piezoelectric device

The object of the present invention is to provide a laminated film made of polylactic acids which is not prone to delamination while having excellent piezoelectric properties and a manufacturing method thereof. That is, the present invention is obtained by the stretched laminated film manufactured by a co-extrusion process for use in piezoelectric polymer materials, containing a layer (A) which has poly-L-lactic acid as the primary component and contains an impact modifier in the range of 0.1 to 10 mass % and a layer (B) which has poly-D-lactic acid as the primary component and contains an impact modifier in the range of 0.1 to 10 mass %.

Stretched laminated film for use in piezoelectric polymer material, and manufacturing method thereof

The invention relates to a piezoelectric vibrator having a piezoelectric laminate in which oriented film layers made of a polylactic acid and conductive layers are laminated alternately and grippers gripping both ends of the piezoelectric laminate, wherein one of two conductive layers neighboring via an oriented film layer is short-circuited to a negative electrode and the other conductive layer is short-circuited to a positive electrode, the oriented film layers interposed between the respective conductive layers are laminated such that the oriented film layers expand and contract in the same direction when a current is applied, the piezoelectric laminate has two parallel surfaces which are parallel to the plane direction of the oriented film layers and two end faces A and B which are between the parallel surfaces and parallel to each other, and the gripped ends respectively include the end face A and the end face B.

Piezoelectric vibrator

A sensor device that includes a film composed of, for example, PLLA; and electrodes for extracting an output voltage from the PLLA film. The electrodes are located on main surfaces of the PLLA film such that the electrodes face each other with at least a portion of the PLLA film being interposed therebetween. The PLLA film has a first side which is fixed, and a second side which is opposite to the first side and is a movable portion. Each of the electrodes is configured to extract an output voltage resulting from an effect of piezoelectric constant dprovided by shear deformation caused by displacement of the movable portion in a direction parallel to the main surfaces of the PLLA film, whereby an operation involving friction or the like can be sensed.

Sensor device and electronic device

A specific region of a polylactic acid sheet is heated by a microwave. To allow the polylactic acid sheet to exhibit piezoelectricity in the thickness direction of the polylactic acid sheet, a high voltage is applied to the heated polylactic acid sheet in the thickness direction of the polylactic acid sheet, and thereby the screw axes of at least a part of the polylactic acid molecules are relatively aligned with the thickness direction. Then the polylactic acid sheet is rapidly cooled, and thereby the polylactic acid molecules are immobilized. The same step is executed for other regions of the polylactic acid sheet, and thereby piezoelectricity is imparted to a wide area of the polylactic acid sheet in the thickness direction. The resultant piezoelectric sheet is capable of exhibiting a high piezoelectricity in the thickness direction.

Piezoelectric sheet, method for manufacturing piezoelectric sheet, and manufacturing apparatus

A touch panel having a piezoelectric sheet with a first region and a second region, and a surface protection film bonded to the second region of the piezoelectric sheet with a non-curable adhesive. The non-curable adhesive has a larger elasticity than a material that bonds the first region of the piezoelectric sheet to the surface protection film.

Touch panel, and touch-type input apparatus and control method therefor

Growing community of inventors

Suita, Japan

Yoshiro Tajitsu