Abstract:
A resin film (2) has through holes (21) formed to extend through the thickness of the resin film (2). The through holes (21) are pillar-shaped. An average density of the through holes (21) is 1 × 10 6 to 1 × 10 12 holes/cm 2 . An average diameter of the through holes (21) is 1 to 310 nm. A degree of variability of the diameter of the through holes (21) is 30% or less, the degree of variability of the diameter of the through holes (21) obtained by dividing a standard deviation of the diameter of the through holes (21) by the average diameter of the through holes (21) and multiplying the resulting value by 100.
Abstract:
A waterproof sound transmission structure of the present disclosure includes: a wall separating a first space from a second space where water can be present, the wall being provided with a sound transmission port for transmission of sound between the first and second spaces; and a waterproof sound-permeable membrane placed to cover the sound transmission port, the waterproof sound-permeable membrane being adapted to permit transmission of sound between the first and second spaces and being further adapted to prevent ingress of water from the second space into the first space through the sound transmission port. The first space is sealed when the second space is filled with water, the sealed first space having a volume of 300 mm 3 or less. The waterproof sound-permeable membrane includes: a non-porous resin film having through holes formed to extend through the thickness of the resin film; and a liquid-repellent layer formed on a principal surface of the resin film and having openings positioned in correspondence with the through holes. The through holes have a diameter of 5.0 µm or more and 13.0 µm or less. The waterproof sound transmission structure of the present disclosure has higher levels of both waterproofness and sound permeability than conventional waterproof sound transmission structures.
Abstract:
A porous electrode sheet (1) includes a resin film (2) being transparent and having insulating properties, and a transparent electrode (3) placed on one face (2a) of the resin film (2). The resin film (2) is provided with a plurality of through holes (21) extending linearly from the one face (2a) to the other face (2b). The transparent electrode (3) has openings (31) at positions corresponding respectively to the through holes (21). The through holes (21) of the resin film (2) and the openings (31) of the transparent electrode (3) communicate with each other, and thereby form passages (10) penetrating the porous electrode sheet (1) in the thickness direction.
Abstract:
The polymer film of the present invention has through holes extending from one principal surface of the polymer film to the other principal surface of the polymer film. The through holes are straight holes having a central axis extending straight, and have a shape in which the area of a cross-section perpendicular to the direction of the central axis increases from the one principal surface of the polymer film toward the other principal surface. This polymer film has passages in its thickness direction, has an unconventional structure, and can be used in various applications, such as in a waterproof sound-permeable membrane, in a waterproof gas-permeable membrane, and in a suction sheet. The ratio a/b of the opening diameter a of the through holes at the one principal surface to the opening diameter b of the through holes at the other principal surface is 80% or is less than 80%, for example.
Abstract:
The air-permeable adhesive sheet of the present disclosure is a sheet having air permeability in a thickness direction thereof and including an adhesive agent layer having first through holes extending in the thickness direction, wherein at least one surface of the adhesive agent layer forms an adhesive surface, the through holes have an average opening diameter of 1.0 to 50 µm and an average interval of 5 to 400 µm, and a variation in air permeability in the thickness direction is 22% or less as represented by a coefficient of variation of an air permeability measured according to Method B for air permeability measurement (Gurley method) specified in JIS L 1096: 2010, with an effective measurement area as a predetermined value selected from 0.5 to 2.0 mm 2 . The air-permeable adhesive sheet of the present disclosure is a sheet capable of obtaining good characteristics such as air permeability even when being made into a sheet having a small area.
Abstract:
The acoustic resistor of the present disclosure is an acoustic resistor for use in an audio device. The acoustic resistor includes a resin film having air permeability in a thickness direction of the resin film, and the resin film is a non-porous film having through holes formed to extend straight through the resin film in the thickness direction. This acoustic resistor is used in an audio device including: a transducing part that performs conversion between sound and an electrical signal and that incudes an acoustic element; a housing enclosing the transducing part and having at least one opening; and a passage for gas that is present inside the housing and communicates with the opening and in which the acoustic element is placed. The acoustic resistor is placed between the opening and the acoustic element in the passage. The variation in properties of the acoustic resistor of the present disclosure can be made smaller than that of conventional acoustic resistors.