Abstract: This invention relates to a method of producing a coextrusion blown film is described. The method involves coextruding a blown film having 3 to 11 layers, including a first skin layer and a second skin layer, the first skin layer comprising nylon, and the second skin layer having a different melting temperature than the first skin layer. The film is then cooled before being passed through steam. The method can be used to produce a coextrusion blown film that has reduced curling.

Abstract: A lens transfer device improved in assemblability. The lens transfer device includes a barrel holder. An upper case includes a first holder connector having a protrusion snap-fitted into a groove formed on an upper-outer circumference of the barrel holder, a first leaf spring connected to an outer circumferential portion of the first holder connector, and a first body connected to an outer circumferential portion of the first leaf spring. A lower includes a second holder connector having a protrusion snap-fitted into a groove formed on a lower-outer circumference of the barrel holder, a second leaf spring connected to an outer circumferential portion of the second holder connector, and a second body connected to the second leaf spring. A yoke is provided to mount a magnet assembly and mounted on the lower case. A coil is installed and spaced by a predetermined gap from the magnet assembly.

Abstract: The invention provides a lens driving device capable of performing zooming and auto-focusing using a single actuator, with a simple and miniaturized structure and less power consumption. The lens driving device includes a first lens disposed movable during zooming and automatic focusing, a second lens disposed movable during zooming independently from the first lens. The lens driving device also includes a lens movement guide member, having a first guide part, and a second guide part, rotated to move the first and second lenses. An actuator is provided to move the first and second lenses, and both the first and second lenses are moved during zooming while only the first lens is finely moved during automatic focusing.

Abstract: Disclosed herein is a focal length adjustment apparatus in which a magnetic fluid that serves as attenuation means is injected between a magnet and a coil to achieve an improvement in a magnetic flux density and damping effect. The apparatus comprises a moving unit including a lens barrel that contains at least one lens therein, and a coil arranged on an outer circumference of the lens barrel, a fixed unit including a yoke formed with an opening for receiving the lens barrel, a case into which the yoke is inserted and mounted, and a magnet affixed to the yoke to be arranged adjacent to the coil, a supporting member used to elastically support the moving unit relative to the case, and attenuation means interposed between the coil and the magnet to attenuate vibration of the moving unit.