Abstract: An object of the invention is to provide a capacitor device that can be made slimmer and lighter and that enables the strength and heat dissipation properties to be improved. A capacitor device (1) has a plurality of capacitor units (2) integrally housed within a housing case (3), the housing case (3) having cylindrical housing sections (5) for housing the capacitor bodies. The housing sections (5) are longitudinally aligned in the same direction and are joined together as an integrated whole. A capacitor unit (2) is inserted via an opening (9) at one end of each of the housing sections (5) so that the entire circumference of the capacitor unit (2) is covered by the corresponding housing section (5). The housing sections (5) have a uniform thickness at least on the outer side along the outer periphery of the capacitor units.

Abstract: A method comprises applying a composition on a substrate to form a coating film on the substrate. The coating film is heated in an atmosphere in which an oxygen concentration is less than 1% by volume and a temperature is higher than 450° C. and 800° C. or lower, to form a film on the substrate. The composition comprises a compound comprising an aromatic ring. The oxygen concentration in the atmosphere during the heating of the coating film is preferably no greater than 0.1% by volume. The temperature in the atmosphere during the heating of the coating film is preferably 500° C. or higher and 600° C. or lower.

Abstract: A composition comprises a compound and a solvent. The compound comprises a carbon-carbon triple bond-containing group, and at least one partial structure having an aromatic ring. A total number of benzene nuclei constituting the aromatic ring in the at least one partial structure is no less than 4. The at least one partial structure preferably comprises a partial structure represented by formula (1). The sum of p1, p2, p3 and p4 is preferably no less than 1. At least one of R1 to R4 preferably represents a monovalent carbon-carbon triple bond-containing group. The at least one partial structure also preferably comprises a partial structure represented by formula (2). The sum of q1, q2, q3 and q4 is preferably no less than 1. At least one of R5 to R8 preferably represents a monovalent carbon-carbon triple bond-containing group.

Abstract: An object of the invention is to provide a capacitor device that can be made slimmer and lighter and that enables the strength and heat dissipation properties to be improved. A capacitor device (1) has a plurality of capacitor units (2) integrally housed within a housing case (3), the housing case (3) having cylindrical housing sections (5) for housing the capacitor bodies. The housing sections (5) are longitudinally aligned in the same direction and are joined together as an integrated whole. A capacitor unit (2) is inserted via an opening (9) at one end of each of the housing sections (5) so that the entire circumference of the capacitor unit (2) is covered by the corresponding housing section (5). The housing sections (5) have a uniform thickness at least on the outer side along the outer periphery of the capacitor units.