Electronics and Telecommunications Research Institute

Wan-Soo Yun

El-Hang Lee

Kang-Ho Park

Sung-Bock Kim

Jeong-Sook Ha

A linear motion apparatus for moving an object in a vacuum chamber comprising an antenna or a telescoping shaft such as a fishing rod to effectively utilize space, and to avoid the need of a rear projection thereby achieving stability. The linear motion apparatus includes: a body having a space portion penetrated horizontally; a rotary handle which penetrates at a right angle to the space portion of the body thereby controlling a linear motion; locking portion which is mounted in the space portion of the body, is inserted into a shaft of the rotary handle, and used to lock the motion; a guide rod which is formed as a multistage rod, whose one end is inserted and fixed into a predetermined position of the space portion of the body; linear motion force providing portion whose one end is fixed to the rotary plate and the other end is fixed to a nose portion of the guide rod, thereby providing a linear motion force to the guide rod; and a bellows seal which surrounds a circumference of the guide rod, is shrunken or expanded according to a linear motion of the guide rod. As a result, this apparatus performs a linear motion control by a contraction and expansion under ultra high vacuum.

Linear motion apparatus under ultra high vacuum

The present invention provides a method for forming a diamond selectively on the topmost part of a pointed tip by applying negative bias to the tip in a chemical vapor deposition system. High temperature tungsten filament is placed above the sharp tip, which is biased negatively to induce selective nucleation and growth of diamond on the topmost part of it.

Growing community of inventors

Kyunggi-do, South Korea

Wan-Soo Yun