Abstract: Disclosed is a log periodic antenna and a manufacturing method thereof. In the log periodic antenna, antenna elements are attached to an antenna body to thereby simplify a structure of the antenna, the antenna can be manufactured in various designs without restriction to the configuration of the antenna, and the number of contacting points between the antenna element and a feeder is minimized to thereby simplify the manufacturing process. By the antenna, it is possible to produce the log periodic antenna of the simple structure and of various designs without the restriction to the antenna configuration by attaching the signal pattern and ground pattern to the pattern receiving surface.

Abstract: A touch screen operating pen, by inserting a pen rubber supporter supporting the inside in the pen rubber section which touches and drags the touch panel/screen, which prevents the pen rubber section from being slipped to one side direction when the pen rubber section drags on the touch screen, and by securing a wider area where the pen rubber section contacts with the touch screen, which can touch and drag the touch panel/screen with a small power, and can effectively perform the touch and drag action while the pen rubber section contacts with the touch panel/screen. In addition, by interposing the plate spring having elastic force between the touch pen body and the pen rubber section which touches the touch panel/screen, it improves the click feeling and greatly raises the success rates of touch and click. Furthermore it can be used with the removable antenna or the constant pressure type touch pen.

Abstract: Disclosed is a log periodic antenna and a manufacturing method thereof. In the log periodic antenna, antenna elements are attached to an antenna body to thereby simplify a structure of the antenna, the antenna can be manufactured in various designs without restriction to the configuration of the antenna, and the number of contacting points between the antenna element and a feeder is minimized to thereby simplify the manufacturing process. By the antenna, it is possible to produce the log periodic antenna of the simple structure and of various designs without the restriction to the antenna configuration by attaching the signal pattern and ground pattern to the pattern receiving surface.

Abstract: Disclosed is an extendable swivel antenna, specifically a swivel antenna with enhanced durability, which can prevent deformation of a hinge unit and an outermost antenna covering the hinge unit.

Abstract: Disclosed is an extendable swivel antenna, specifically a swivel antenna with enhanced durability, which can prevent deformation of a hinge unit and an outermost antenna covering the hinge unit.

Abstract: The variable lamination rapid prototyping apparatus of the present invention includes a first feeding means which longitudinally reciprocates a sheet, a second feeding means which is provided under the first feeding means and reciprocates in a direction transverse to the sheet, and a rotating means which is coupled to the second feeding means and rotates around an axis parallel to the transverse direction of the sheet. The apparatus further includes a translation means which is linked to the rotating means, a cutting means which is coupled to the translation means, and a stacking means which subsequently stacks a plurality of cut sheets, thus forming the 3-dimensional object. The apparatus further includes a control means which previously stores data about the object therein and controls the above-mentioned plurality of means based on the data. Because a hot wire is provided in a parallelogram link structure, superior cutting accuracy and the stability are ensured.

Abstract: A rapid prototyping process and apparatus that provides an intermittent material feed type variable-lamination rapid prototyping using a linear thermal cutting system, wherein intermittently fed materials are cut to have variable lengths, widths, and lateral gradients with the 4-axis control-type linear thermal cutting system controlled by a computer, and based on cutting operation data generated in the computer.

Abstract: A rapid prototyping process and apparatus that provides an intermittent material feed type variable-lamination rapid prototyping using a linear thermal cutting system, wherein intermittently fed materials are cut to have variable lengths, widths, and lateral gradients with the 4-axis control-type linear thermal cutting system controlled by a computer, and based on cutting operation data generated in the computer.