Abstract: This dielectric film is a dielectric film comprising an oxide having a perovskite structure. The oxide comprises (1) Bi, Na and Ti, (2) at least one of Ba and Ca, and (3) at least one element Ln selected from the group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Yb and Y. When ratios of the numbers of atoms of Bi, Ba and Ca to the total of the numbers of atoms of Bi, Na, Ba and Ca in the oxide are represented by XBi, XBa and XCa, respectively, the ratios satisfy 0.2?XBi/(XBa+XCa)?5.

Abstract: A dielectric film, contains: (1) Bi and Ti; (2) at least one element E1 selected from the group consisting of Na and K; and (3) at least one element E2 selected from the group consisting of Ba, Sr, and Ca. The dielectric film has a main phase containing an oxide that contains Bi, Ti, the element E1, and the element E2 and has a perovskite structure, and a subphase that contains Bi and has an oxygen concentration lower than that of the main phase. In a sectional surface of the dielectric film, a ratio RS of an area of the subphase to a sum of an area of the main phase and the area of the subphase is greater than or equal to 0.03 and less than or equal to 0.3.

Abstract: In a capacitor unit including a pair or a plurality of pairs of capacitors having a dielectric, a first electrode formed on the dielectric, and a second electrode formed on the dielectric, wherein voltages in reverse directions are applied between the first electrodes and the second electrodes of respective two capacitors forming a pair.

Abstract: A spotlight is provided with a substrate having LEDs disposed thereon and a main body casing on which the substrate is provided. The main body casing has a rear side portion having thermal conductivity, which is thermally coupled to the substrate, and is capable of changing the irradiation angle of light emitted from the LEDs. A plurality of heat-radiating fins for forming grooves operating as a plurality of convection paths along the direction of changing the irradiation angle are provided on the rear side portion of the main body casing.

Abstract: A spotlight is provided with a substrate having LEDs disposed thereon and a main body casing on which the substrate is provided. The main body casing has a rear side portion having thermal conductivity, which is thermally coupled to the substrate, and is capable of changing the irradiation angle of light emitted from the LEDs. A plurality of heat-radiating fins for forming grooves operating as a plurality of convection paths along the direction of changing the irradiation angle are provided on the rear side portion of the main body casing.