Abstract: Disclosed is a surfactant composition in which at least one of surface tension and interfacial tension is superior, the composition including a fluorinated surfactant and a phospholipid-based surfactant, and optionally further including a sulfosuccinate-based surfactant.

Abstract: Disclosed is a surfactant composition in which at least one of surface tension and interfacial tension is superior, the composition including a fluorinated surfactant and a phospholipid-based surfactant, and optionally further including a sulfosuccinate-based surfactant.

Abstract: There is providing a lens barrel assembly including a base, a movable module movable along a linear path between a position close to the base and an extended position from the base, and a flexible printed circuit board including a first connection part, a bent part, and a second connection part. An end of the first connection part is connected to the movable module. The bent part is bent from the other end of the first connection part. An end of the second connection part is connected to the base and the other end of the second connection part is connected to the bent part. When the movable module is at a position close to the base, the first and second connection parts are close, and when the movable module is at the extended position, the first and second connection parts spread apart from the bent part.