公开(公告)号：US20230311559A1

公开(公告)日：2023-10-05

申请号：US18127345

申请日：2023-03-28

Applicant: NITTO DENKO CORPORATION

Inventor： Saori YAMAMOTO ,  Masahiro YAEGASHI ,  Yuji TOYOTA

IPC: B43L1/10 ,  B32B18/00 ,  B32B7/023

CPC classification number: B43L1/10 ,  B32B18/00 ,  B32B7/023 ,  B43K5/02

Abstract: A writing board set includes a writing board and a writing utensil containing ink. The writing board reflects back, when unpolarized light is incident on its surface at a viewer's side, polarized light which is parallel to a first direction and which has a degree of polarization of 95% or more. Ld*, ad*, and bd* are values of L*, a*, and b* as obtained by irradiating the surface of the writing board with light that has been transmitted through a polarizing layer having a transmission axis which is orthogonal to the first direction, and measuring total reflectance through spectrophotometry. Li*, ai*, and bi* are values of L*, a*, and b* as obtained by irradiating the ink having been introduced onto a surface of a glass panel with unpolarized light, and measuring total reflectance through spectrophotometry. A color difference ΔE*ab as defined by eq. (1) is 19 or less:


ΔE*ab[(Li*−Ld*)2+(ai*−ad*)2+(bi*−bd*)2]1/2  (1).

公开(公告)号：US20200332518A1

公开(公告)日：2020-10-22

申请号：US16765411

申请日：2018-11-20

Applicant: NITTO DENKO CORPORATION

Inventor： Yusuke KOMOTO ,  Tomoaki HISHIKI ,  Kohei OTO ,  Saori YAMAMOTO ,  Yuka SEKIGUCHI

IPC: E04B1/82 ,  H04R17/00

Abstract: A sound reducing system (500) includes at least one sound reducing speaker for radiating a sound wave for sound reduction. The at least one sound reducing speaker includes a piezoelectric speaker (10). The piezoelectric speaker (10) includes a piezoelectric film (35), a fixing face (17) in contact with a support supporting the piezoelectric speaker (35), and a film holding portion (55) disposed between the piezoelectric film (35) and the fixing face (17). (i) The film holding portion (55) includes a pressure-sensitive adhesive layer and the fixing face (17) is formed of a surface of the pressure-sensitive adhesive layer and/or (ii) the film holding portion (55) includes a porous body layer.

公开(公告)号：US20220223136A1

公开(公告)日：2022-07-14

申请号：US17595617

申请日：2020-04-02

Applicant: NITTO DENKO CORPORATION ,  THE SCHOOL CORPORATION KANSAI UNIVERSITY

Inventor： Kohei OTO ,  Yusuke KOMOTO ,  Ryohei OBAN ,  Saori YAMAMOTO ,  Yoshinobu KAJIKAWA ,  Shun HIROSE

IPC: G10K11/178

Abstract: A speaker (10) includes a radiation surface (15). The radiation surface (15) has a first region (15a), a second region (15b), and a third region (15c) between the first region (15a) and the second region (15b). When an axis passing through the third region (15c) and extending away from the radiation surface (15) is defined as a reference axis (10X), the speaker (10) forms a first wavefront (16a) propagating from the first region so as to approach the reference axis (10X) and a second wavefront (16b) propagating from the second region (15b) so as to approach the reference axis (10X).

公开(公告)号：US20210029468A1

公开(公告)日：2021-01-28

申请号：US16764757

申请日：2018-11-20

Applicant: NITTO DENKO CORPORATION

Inventor： Yusuke KOMOTO ,  Tomoaki HISHIKI ,  Kohei OTO ,  Saori YAMAMOTO ,  Yuka SEKIGUCHI

IPC: H04R17/00 ,  H01L41/09

Abstract: A piezoelectric speaker-forming laminate (10) includes: a piezoelectric film (35); a pressure-sensitive adhesive face (17); an interposed layer (40) being a porous body layer and/or a resin layer disposed between the piezoelectric film (35) and the pressure-sensitive adhesive face (17); and a release layer (20) joined to the pressure-sensitive adhesive face (17). The pressure-sensitive adhesive face (17) is disposed in such a manner that at least a portion of the piezoelectric film (35) overlaps the pressure-sensitive adhesive face (17) when the piezoelectric film (35) is viewed in plan. The piezoelectric film (35) and the interposed layer (40) are allowed to be fixed to a support (80) as a piezoelectric speaker or a portion of a piezoelectric speaker by sticking the pressure-sensitive adhesive face (17) from which the release layer (20) has been removed to the support (80).

公开(公告)号：US20200351594A1

公开(公告)日：2020-11-05

申请号：US16765106

申请日：2018-11-20

Applicant: NITTO DENKO CORPORATION

Inventor： Yusuke KOMOTO ,  Tomoaki HISHIKI ,  Kohei OTO ,  Saori YAMAMOTO ,  Yuka SEKIGUCHI

IPC: H04R17/00 ,  B32B7/022 ,  H01L41/09 ,  H01L41/193

Abstract: A piezoelectric speaker (10) includes: a piezoelectric film (35); a fixing face (17) for fixing the piezoelectric film (35) to a support; and an interposed layer (40) disposed between the piezoelectric film (35) and the fixing face (17). The interposed layer (40) has a holding degree of 5×108 N/m3 or less.

公开(公告)号：US20200287125A1

公开(公告)日：2020-09-10

申请号：US16765796

申请日：2018-11-20

Applicant: NITTO DENKO CORPORATION

Inventor： Yusuke KOMOTO ,  Kohei OTO ,  Saori YAMAMOTO ,  Ryohei OBAN ,  Tomoaki HISHIKI

IPC: H01L41/193 ,  B32B7/025 ,  B32B7/12 ,  H01L41/09

Abstract: A piezoelectric speaker (10) includes a piezoelectric film (35), a first joining layer (51), and an interposed layer (40). The piezoelectric film (35) includes a first electrode (61), a second electrode (62), and a piezoelectric body (30) sandwiched by the first electrode (61) and the second electrode (62). The first joining layer (51) is a layer having pressure-sensitive adhesiveness or adhesiveness. The interposed layer (40) is disposed between the piezoelectric film (35) and the first joining layer (51). Both principal surfaces of the piezoelectric film (35) vibrate up and down as a whole.