scispace - formally typeset
Search or ask a question
Author

Yoshiro Tajitsu

Bio: Yoshiro Tajitsu is an academic researcher from Sumitomo Electric Industries. The author has an hindex of 1, co-authored 1 publications receiving 9 citations.

Papers
More filters
Patent
28 Jan 2013
TL;DR: In this paper, the authors provided a piezoelectric element, including a porous fluororesin film made of a first fluororensin and a nonporous fluororesins layer stacked on at least one surface of the porous film.
Abstract: There is provided a piezoelectric element, including: a porous fluororesin film made of a first fluororesin; and a nonporous fluororesin layer stacked on at least one surface of the porous fluororesin film and made of a second fluororesin, wherein the first fluororesin is different in type from the second fluororesin, and when 50 pores are selected in descending order from a pore having the longest thickness-direction length, of pores present in a cut surface of the porous fluororesin film in a thickness direction, an average value A 50 of thickness-direction lengths of the 50 pores is 3 μm or smaller.

9 citations


Cited by
More filters
Patent
26 Aug 2016
TL;DR: In this paper, a piezoelectric element includes a first electrode, a pyrolyte layer which is formed on the first electrode by using a solution method, and is formed from compound oxide which has a perovskite structure in which potassium, sodium, and niobium are provided.
Abstract: A piezoelectric element includes a first electrode, a piezoelectric layer which is formed on the first electrode by using a solution method, and is formed from compound oxide which has a perovskite structure in which potassium, sodium, and niobium are provided, and a second electrode which is provided on the piezoelectric layer. The piezoelectric layer has a peak derived from a (200) plane and a peak derived from a (002) plane in an X-ray diffraction pattern obtained by θ-2θ measurement.

11 citations

Patent
11 May 2015
TL;DR: In this paper, a force detection device consisting of a first base 2, a second base 3, and an electric charge output element 10 disposed between the bases was proposed to provide a force direction device hardly affected by temperature fluctuation.
Abstract: PROBLEM TO BE SOLVED: To provide a force direction device hardly affected by temperature fluctuation, a robot, and an electronic component conveyance apparatus.SOLUTION: A force detection device 1 comprises; a first base 2, a second base 3, and an electric charge output element 10 disposed between the bases. The electric charge output element 10 includes a first detection plate constituted by a Y-cut quartz plate and a second detection plate constituted by a Y-cut quartz plate. The detection plates are laminated in a direction orthogonal to a normal line NLof a mounting surface 321 of the second base 3. The force detection device 1 detects external force on the basis of: a first output in response to shear force in a first detection direction orthogonal to a laminating direction LD of the first detection plate; and a second output in response to shear force in a second detection direction that is orthogonal to a laminating direction Ld of the second detection plate and intersects with the first detection direction.

2 citations

Patent
23 Apr 2019
TL;DR: In this article, the authors proposed a method to construct two or more closed holes with two different sizes in the pressure sensitive thin film, and the closed holes are internally provided with gas.
Abstract: The invention relates to a pressure sensitive thin film, a sensor, a sensor array and corresponding preparation methods of the pressure sensitive thin film, the sensor and the sensor array. Two or more closed holes with two different sizes are formed in the pressure sensitive thin film, the closed holes are internally provided with gas, and the sizes of the closed holes gradually increase upwardsfrom the bottom of the pressure sensitive thin film in the direction perpendicular to the thickness of the pressure sensitive thin film. The sensitivity of the pressure sensitive thin film is improved.

2 citations

Patent
19 Jan 2017
TL;DR: In this paper, the authors proposed a method to improve sensitivity without excessively increasing injected charge density in a film-type pressure sensor by using insulation elements and electrodes that serially connect the first electret elements and the second electret element so as to alternately reverse the initial polarizing directions thereof.
Abstract: PROBLEM TO BE SOLVED: To improve sensitivity without excessively increasing injected charge density in a film-type pressure sensorSOLUTION: The film-type pressure sensor includes: first electret elements having a plurality of hollow parts in a polymer film and initially polarized in a first direction by electric charge injected in the hollow parts; second electret elements having a plurality of hollow parts in a polymer film and initially polarized in a direction reverse to the first direction by electric charge injected in the hollow parts: and electrodes that separates the first electret elements and the second electret elements from each other by insulation elements and serially connect the first electret elements and the second electret elements so as to alternately reverse the initial polarizing directions thereofSELECTED DRAWING: Figure 1

1 citations

Patent
08 Jan 2020
TL;DR: An electretized film of the present invention includes a cyclic olefin polymer, which is a nonporous film, and a piezoelectric constant d33 in a thickness direction, measured by applying a pressing force to the electretised film in the thickness direction.
Abstract: 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 d33 in 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 ±0.25 N, a frequency of 110 Hz, a temperature of 23° C., and a humidity of 50%, is equal to or more than 100 pC/N.