Abstract: The capacitor includes at least: a capacitor body; two lead wires provided on one end surface; a projecting portion provided at a substantially central portion of another end surface; and at least two relief valves provided on the another end surface. On the another end surface, the at least two relief valves are arranged in substantially rotational symmetry with respect to the projecting portion. Further, an axial center line of the projecting portion and an axial center line of the capacitor substantially correspond to each other. Also provided are a capacitor case to be used the capacitor and a substrate provided with a circuit using the capacitor.

Abstract: The capacitor includes at least: a capacitor body; two lead wires provided on one end surface; a projecting portion provided at a substantially central portion of another end surface; and at least two relief valves provided on the another end surface. On the another end surface, the at least two relief valves are arranged in substantially rotational symmetry with respect to the projecting portion. Further, an axial center line of the projecting portion and an axial center line of the capacitor substantially correspond to each other. Also provided are a capacitor case to be used for the capacitor and a substrate provided with a circuit using the capacitor.

Abstract: An ultrasonic microscope has an optical microscope disposed in juxtaposition therewith so that the optical microscope can directly observe a specimen to be observed by the ultrasonic microscope, by moving the specimen toward the optical microscope. The optical microscope can also observe a region where an acoustic lens of the ultrasonic microscope and the specimen face each other. For that purpose, the optical microscope is provided with an optical reflector for suiting the view of field of the optical microscope to the region where the acoustic lens and the specimen face each other. Alternatively, the optical microscope is swingably supported so that the view of field of the optical microscope is suited to the region where the acoustic lens and specimen face each other.