Abstract: A deformation detection sensor includes a bendable flexible substrate having a substrate upper main surface and a substrate lower main surface arranged in a vertical direction, a first sensor provided on the substrate upper main surface and including a first piezoelectric film, and a second sensor provided on the substrate lower main surface and including a second piezoelectric film. Thickness in the vertical direction of the second piezoelectric film is larger than thickness in the vertical direction of the first piezoelectric film, and the first sensor and the second sensor are bent as the flexible substrate is bent so as to project in an upper direction or a lower direction.

Abstract: A sensor that includes: a piezoelectric film including an upper principal surface and a lower principal surface aligned in an up-down direction; a first electrode on the upper principal surface of the piezoelectric film; a second electrode on the lower principal surface of the piezoelectric film; and a first cured resin layer covering at least a part of the second electrode as viewed in the up-down direction.

Abstract: An ESD protective device includes an element assembly with a hollow portion that includes inner surfaces including a first inner surface, a second inner surface, and a third inner surface inclined to a Z direction in a cross section including the Z direction. Accordingly, a surface area of the inner surfaces of the hollow portion is increased, the heat load on an auxiliary discharge electrode is reduced, and the deterioration of the auxiliary discharge electrode is significantly reduced or prevented.

Abstract: A ceramic electronic component that includes a ceramic element, and a coating film and external electrodes on a surface of the ceramic element. The coating film includes cationic elements from a constituent element of the ceramic element, which are ionized and deposited from the ceramic element, and a resin. The surface of the coating film is recessed relative to a surface of wrapping parts of the external electrodes on the surface of the ceramic element.

Abstract: An ESD protective device includes an element assembly with a hollow portion that includes inner surfaces including a first inner surface, a second inner surface, and a third inner surface inclined to a Z direction in a cross section including the Z direction. Accordingly, a surface area of the inner surfaces of the hollow portion is increased, the heat load on an auxiliary discharge electrode is reduced, and the deterioration of the auxiliary discharge electrode is significantly reduced or prevented.

Abstract: A ceramic electronic component that includes a ceramic element, and a coating film and external electrodes on a surface of the ceramic element. The coating film includes cationic elements from a constituent element of the ceramic element, which are ionized and deposited from the ceramic element, and a resin. The surface of the coating film is recessed relative to a surface of wrapping parts of the external electrodes on the surface of the ceramic element.