Abstract: A frame assembly constitutes a base or a carrier of the optical actuator, and includes first and second rail shafts formed of a metal, and a frame formed by injecting a resin into a mold into which the first rail shaft and the second rail shaft are inserted. At least a part of each of the first rail shaft and the second rail shaft coming into contact with the ball is exposed through one surface of the frame, and a plurality of first shaft position alignment holes arranged in a longitudinal direction of the first rail shaft to expose the first rail shaft therethrough and a plurality of second shaft position alignment holes arranged in a longitudinal direction of the second rail shaft to expose the second rail shaft therethrough are formed in a remaining surface of the frame.

Abstract: Disclosed is a rail assembly applied to an optical actuator including a base and a carrier provided to be movable in an optical axis direction with respect to the base through a ball. The rail assembly includes a guide groove structure provided on at least one of the base and the carrier, formed of a synthetic resin, and configured to define a guide groove extending extend long in the optical axis direction, and an insert rail formed of a metal and installed in the guide groove. The insert rail includes a rail main body extending long in the optical axis direction along the guide groove, insert molded into the guide groove structure, and having at least one contact surface coming into contact with the ball, and at least one protrusion protruding from a side surface of the rail main body and embedded in the guide groove structure.

Abstract: Disclosed is a rail assembly applied to an optical actuator including a base and a carrier provided to be movable in an optical axis direction with respect to the base through a ball. The rail assembly includes a guide groove structure provided on at least one of the base and the carrier, formed of a synthetic resin, and configured to define a guide groove extending extend long in the optical axis direction, and an insert rail formed of a metal and installed in the guide groove. The insert rail includes a rail main body extending long in the optical axis direction along the guide groove, insert molded into the guide groove structure, and having at least one contact surface coming into contact with the ball, and at least one protrusion protruding from a side surface of the rail main body and embedded in the guide groove structure.

Abstract: The present invention relates to a water hammer recognizing and energy saving water hammer prevention system and a method for controlling the same that is configured wherein in case of the selective on/off operations of a plurality of pumps in a pipe system in accordance with the change of the use environment, the pressure variation and level variation of an air chamber caused by water hammer are compared with reference values and set values, and they are divided into a normal mode and a safe mode, thereby controlling the air intake and exhaust of the air chamber and preventing energy consumption from unnecessarily occurring.