Yoon Chul
Yoon Chul Cho, Seoul KR
Patent application number | Description | Published |
---|---|---|
20100033864 | METHODS OF FORMING AND READING SERVO TRACK AND DATA STORAGE APPARATUS - A method of forming a servo track on a recording medium includes; forming a magnetic layer, defining a first servo track region having a plurality of first magnetic segments and a second servo track region having a second plurality of magnetic segments in the magnetic layer, applying a first magnetic field to induce a first magnetization direction in the first and second pluralities of magnetic segments, forming first magnetic patterns, each having a first width, and second magnetic patterns, each having a second width different from the first width, on a first side of a substrate, disposing the substrate on the recording medium, such that the first magnetic patterns are aligned in correspondence with the plurality of first magnetic segments and the second magnetic patterns are aligned in correspondence with the plurality of second magnetic segments, and applying a second magnetic field to the recording medium to selectively induce a second magnetization direction into first selected ones of the first plurality of magnetic segments and second selected ones of the second plurality of magnetic segments. | 02-11-2010 |
20100297364 | SERVO PATTERN FORMING METHOD OF HARD DISK DRIVE - A servo pattern forming method of a hard disk drive includes magnetically printing a reference servo pattern, which has different features according to zones divided along a radial direction of a disk, on the disk, and recording a final servo pattern in the disk on the basis of the reference servo pattern. As a result, the quality of a final servo pattern can be enhanced by preventing an amplitude drop that arises in an ID zone of the disk when a reference servo pattern is recorded using a conventional servo track writer. | 11-25-2010 |
Yoon Chul Kim, Gyeonggi-Do KR
Patent application number | Description | Published |
---|---|---|
20110024659 | BUTTERFLY VALVE - A butterfly valve comprises a valve body, a seat ring mounted on a flow passage of the valve body, a disc rotatably mounted to the valve body and configured to open and close the flow passage by being attached to the seat ring; and a driving device configured to linearly move and rotate the disc so as to prevent interference between the disc and the seat ring when the flow passage of the valve body is open and closed. | 02-03-2011 |
Yoon Chul Son, Hwaseong-Si, Gyeonggi-Do KR
Patent application number | Description | Published |
---|---|---|
20150340123 | TRANSPARENT CONDUCTOR AND ELECTRONIC DEVICE INCLUDING THE SAME - A transparent conductor including a Group 5 transition metal and boron, wherein the compound has a layered structure. | 11-26-2015 |