Samsung Electro-Mechanics Co., Ltd.

Korea Institute of Machinery & Materials

Lg Electronics Inc.

Jong Kweon Park

Hyun Hak Kim

Jung Nam Lee

Sun Kyung Kim

Seok Kyoon Woo

Jae Chang Lee

Seung Kook Ro

Sung Cheul Lee

Seok Ho Choi

Jae Yeong Park

Byung Sub Kim

Hung Sun Son

Yeong Sang Jeong

Hyung Wook Park

Woo Cheol Shin

A tool holder holding a tool according to the present invention includes: a tool mounting unit forming and penetrating a tool fixing hole having an interior diameter that is relatively smaller than an exterior diameter of a shank unit of the tool; and at least one shape memory alloy ring inserted and arranged to a ring fixing hole formed at the tool mounting unit to have an interior diameter that is relatively larger than the tool fixing hole, wherein an interior diameter size of the tool fixing hole is forcibly changed by deformation of a shape memory alloy ring by a heating source and a cooling source provided to the shape memory alloy ring for clamping or unclamping the tool.

Tool holder using shape memory alloy and tool holding method

A 3-dimensional (3D) variable-axis machine is disclosed, which includes a frame spaced from a base to be disposed at an upper surface of a workpiece, a pair of forward and backward pivoting frames having an arch shape connected to the frame, a pair of leftward and rightward pivoting frames having an arch shape and a relatively less height than the forward and backward pivoting frames to be connected across the forward and backward pivoting frames, and a spindle vertically inserted in an intersectional portion between the forward and backward and the leftward and rightward pivoting frames to be pivoted corresponding to movements of the both pivoting frames. The spindle is connected to a sliding member, and the sliding member is connected to a lower surface of the forward and backward pivoting frames and an upper surface of the leftward and rightward pivoting frames in a sliding manner.

3-dimensional variable-axis machine

An antenna includes a dielectric substrate, a radiator disposed on one surface of the dielectric substrate, a feeding conductive pattern having one end connected with the radiator and the other end connected with an external feed line, a first slot disposed in the feeding conductive pattern, a ground plane disposed on the other surface of the dielectric substrate, and a second slot disposed on the ground plane.

Antenna

There is provided a mobile communication terminal including: a dielectric substrate; a ground surface formed on a first area of the dielectric substrate; a radiation part disposed on a second area where the ground surface is not formed, at a predetermined distance from the dielectric substrate, the radiation part having first and second slots formed thereon; a feeding line formed on the second area of the dielectric substrate and having one end connected to the radiation part; a ground line disposed on the second area of the dielectric substrate at a predetermined distance from the feeding line and having one end connected to the radiation part and another end connected to the ground surface; and a matching ground surface formed on the second area of the dielectric substrate, the matching ground surface disposed in a superimposed relationship with a portion of the radiation part and extending from the ground surface to be capacitively coupled to the radiation part.

Multi-band antenna and mobile communication terminal having the same

An antenna for ultra-wide band communication is disclosed. The antenna includes a substrate, a patch formed on one side of the substrate so as to be smaller than the substrate, and being excited when an electric current is supplied through a feeder line, so as so radiate energy, and a ground area formed by removing a portion of another side of the substrate so as to obtain a wide band characteristic.

Antenna for ultra-wide band communication

Growing community of inventors

Daejeon, South Korea

Jong Kweon Park