Daikin Industries, Ltd.

Toho Kasei Co., Ltd.

Meiten Kou

Takashi Kanemura

Tetsuhiro Kodani

Eri Mukai

Susumu Kawato

Satoshi Shimizu

Tomoyuki Gotou

Saori Inaba

An object of the present invention is to provide a bimorph piezoelectric film that enables the production of touch panels and the like that are less influenced by pyroelectric noise due to temperature change, and exhibit high transparency. The present invention provides a bimorph piezoelectric film comprising in sequence

Bimorph-type piezoelectric film

A touch panel hardly affected by pyroelectric noise due to temperature includes a first pyroelectric material and a second pyroelectric material, and is capable of detecting press pressure applied to the first pyroelectric material and/or the second pyroelectric material. The upper surface of the first pyroelectric material and the lower surface of the second pyroelectric material are surfaces on which a positive charge is generated when the temperature increases, and a negative charge is generated when the temperature decreases. The lower surface of the first pyroelectric material and the upper surface of the second pyroelectric material are surfaces on which a negative charge is generated when the temperature increases, and a positive charge is generated when the temperature decreases.

Touch panel, touch input device, and electronic device

An object of the present invention is to provide a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film that can significantly reduce, when used as an optical film, the deterioration of the quality of video or still images formed by display elements. The present invention provides a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film having 2,000 or fewer spot defects per m, the number of spot defects being measured by a defect measurement method;

Method and apparatus for producing a polarized resin film

An object of the present invention is to provide a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film that can significantly reduce, when used as an optical film, the deterioration of the quality of video or still images formed by display elements. The present invention provides a polarized vinylidene fluoride/tetrafluoroethylene copolymer resin film having 2,000 or fewer spot defects per m, the number of spot defects being measured by a defect measurement method; the method using an surface inspection system in which a CCD camera is placed so as to detect defects at an angle of 45 degrees relative to an LED source, defects of the film are read within a rectangular range of 300 mm in a width direction (the direction perpendicular to the scanning direction), and 150 mm in a machine direction (the scanning direction), while the film is scanned under the camera at a rate of 20 m/min; wherein first, defects having a bright area of 1.5 mmor less and a dark area of 1.4 mmor less are selected; and next, in order to remove defects resulting from causes other than a corona treatment contained in these defects, a circumscribed rectangle of defect is set so as to have two sides along the scanning direction, and the number of only defects that have a circumscribed width of 2.88 mm or less, a circumscribed length of 2.3 mm or less, an aspect ratio of &#x2212;39 to +27, an occupancy area ratio in the circumscribing rectangle of 4,000 to 6,950, and an area ratio of &#x2212;3,100 to +5,200, is automatically counted as spot defects by the surface inspection system.

Growing community of inventors

Osaka, Japan

Meiten Kou