Patents by Inventor Mun-Cheol Paek
Mun-Cheol Paek has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20100092183Abstract: A frequency tunable terahertz continuous wave generator controls the number of feedbacks of an optical signal output from an optical intensity modulator by adding a feedback loop between input and output terminals of the optical intensity modulator, thereby simply tuning a frequency of a terahertz continuous wave.Type: ApplicationFiled: June 30, 2009Publication date: April 15, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Sungil Kim, Kwang Yong Kang, Mun Cheol Paek, Sang Kuk Choi, Min Hwan Kwak, Han Cheol Ryu
-
Patent number: 7684023Abstract: An apparatus and method for generating a terahertz (THz) wave are provided. The apparatus comprises: an fiber optic probe injecting an optical wave transmitted through an optical fiber into a device under test (DUT); a driving oscillator generating and injecting an electrical wave into the DUT; and the device under test (DUT) generating a THz wave using the produced optical and electrical waves.Type: GrantFiled: June 7, 2007Date of Patent: March 23, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Kwang Yong Kang, Mun Cheol Paek, Doo Hyeb Youn, Min Hwan Kwak, Suk Gil Han
-
Patent number: 7580336Abstract: An optical head has a beam input/output coupler on a planar waveguide and other parts including: a light transmitting element emitting a beam; a planar waveguide formed on a substrate and receiving the beam oscillated from the light transmitting element; a beam input/output coupler integrated as a thin film on a portion of the planar waveguide and receiving the beam through the planar waveguide to transmit the beam vertically toward a disc positioned above the planar waveguide or transmitting the beam reflected from the disc through the planar waveguide; and light receiving elements receiving the beam propagated to the planar waveguide through the beam input/output coupler.Type: GrantFiled: November 10, 2005Date of Patent: August 25, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Dong Woo Suh, Yong Woo Park, Mun Cheol Paek, Ho Jun Ryu, Hee Sook Chung, Kwang Yong Kang
-
Patent number: 7562374Abstract: Provided is a form factor disk such as an optical or magnetic disk used in electronic appliances and information appliances. The form factor disk includes: a circular plate having a first hole for inserting a rotational shaft, a plurality of second holes formed adjacent to the first hole, and an information storage region formed at a surface thereof; an upper metal hub located on the circular plate, and having a hole aligned with the first hole of the circular plate and column-shaped joints formed at portions corresponding to the second holes of the circular plate; and a lower metal hub located under the circular plate, and having a hole aligned with the first hole of the circular plate and column-shaped joints formed at portions corresponding to the second holes of the circular plate, wherein the joints of the upper and lower metal hubs are jointed through the second holes.Type: GrantFiled: June 9, 2005Date of Patent: July 14, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Woo Seok Cheong, Yong Goo Yoo, Sung Q Lee, Ho Jun Ryu, Mun Cheol Paek, Eun Kyoung Kim
-
Patent number: 7558187Abstract: Provided is an apparatus and method of initializing a recording layer used in manufacturing a phase-change optical disk for storing information. The optical disk is initialized using a UV lamp in order to initialize the recording layer of the phase-change optical disk capable of repeatedly writing information, without a separate optical head, whereby it is possible to increase productivity by remarkably reducing an initialization time of the optical disk since a large area is initialized using a UV beam.Type: GrantFiled: December 8, 2005Date of Patent: July 7, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Woo Seok Cheong, Yong Goo Yoo, Ho Jun Ryu, Eun Kyoung Kim, Mun Cheol Paek
-
Publication number: 20090152699Abstract: There is provided a packaging apparatus of a terahertz device, the apparatus including: a terahertz device having an active region at which terahertz wave is radiated or detected; a device substrate mounting the terahertz device whose active region is positioned at an opening region formed at the center of the device substrate, and electrically connecting the terahertz device and an external terminal to each other; a ball lens block arranged and fixed to an upper part of the terahertz device; and upper and lower cases receiving the device substrate mounted with the terahertz device therein and opening region vertical upper and lower portions of the active region of the terahertz device.Type: ApplicationFiled: July 21, 2008Publication date: June 18, 2009Applicant: Electronics and Telecommunications Research InstituteInventors: Sang Kuk CHOI, Kwang Yong Kang, Mun Cheol Paek, Min Hwan Kwak
-
Publication number: 20090141387Abstract: A nanoprobe-based heating apparatus includes a nanoprobe, a heating unit, a gap control unit, and a support unit. The nanoprobe has a tip forming at an end of the nanoprobe, and the tip applies heat to a magnetic recording bit of a recording medium. The heating unit heats the nanoprobe. The gap control unit controls a gap between the nanoprobe and the recording medium. The support unit supports the nanoprobe, the heating unit, and the gap control unit. The nanoprobe-based heating apparatus is installed at a magnetic recording head of a magnetic hard disk drive to be able to heat an ultra-fine region of a recording medium very rapidly by applying heat together with a magnetic field.Type: ApplicationFiled: August 28, 2008Publication date: June 4, 2009Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Mun Cheol PAEK, Kwang Yong Kang
-
Patent number: 7540004Abstract: An ultra-small optical/magnetic head actuator includes: a swing arm movable in a horizontal direction (tracking direction) and a vertical direction (focusing direction) and having mounted thereon a head for reading and writing information on a disk. A tracking actuator moves the swing arm in the horizontal direction (tracking direction) and a pivot hinge adjusts a radius of rotation of the swing arm and guides the movement of the swing arm in the tracking direction. A focusing actuator moves the swing arm in the vertical direction (focusing direction), wherein the focusing actuator includes a focusing coil attached under the swing arm and a Halbach magnet array disposed under the focusing coil minimizes thickness. Friction or backlash can be avoided, and non-repetitive errors can be reduced. The thickness of the ultra-small storage device can be reduced due to the use of a Halbach magnet array.Type: GrantFiled: November 9, 2005Date of Patent: May 26, 2009Assignee: Electronics and Telecommunications Research InstituteInventors: Sung Q Lee, Kang Ho Park, Mun Cheol Paek, Kwang Yong Kang
-
Patent number: 7399420Abstract: Provided are a stamper fabricated by using an embossing master and a focusing grating coupler fabricated by using the stamper, which is applicable to a subminiature pickup head for a mobile optic disk, whereby it is possible to reduce a weight and a volume of the pickup head with a simple process and low cost and to apply for mass production.Type: GrantFiled: March 19, 2004Date of Patent: July 15, 2008Assignee: Electronics and Telecommunications Research InstituteInventors: Mun Cheol Paek, Dong Woo Suh, Ho Jun Ryu, Hyeon Bong Pyo, Yong Woo Park
-
Publication number: 20080137093Abstract: An apparatus and method for generating a terahertz (THz) wave are provided. The apparatus comprises: an fiber optic probe injecting an optical wave transmitted through an optical fiber into a device under test (DUT); a driving oscillator generating and injecting an electrical wave into the DUT; and the device under test (DUT) generating a THz wave using the produced optical and electrical waves.Type: ApplicationFiled: June 7, 2007Publication date: June 12, 2008Applicant: Electronic and Telecommunications Research InstituteInventors: Kwang Yong Kang, Mun Cheol Paek, Doo Hyeb Youn, Min Hwan Kwak, Suk Gil Han
-
Publication number: 20080080360Abstract: Provided is an optical disk drive adapter comprising: a first rotating portion disposed at the center of an optical disk drive and installing a turntable on which a standard optical disk is mounted; a second rotating portion disposed beside the first rotating portion and installing a turntable on which a subminiature optical disk is mounted; a force transmitting portion disposed between the first rotating portion and the second rotating portion and transmitting a rotary force between the first rotating portion and the second rotating portion; and a housing supporting the entire optical disk drive adapter so that the first rotating portion, the second rotating portion, and the force transmitting portions can be rotated on their axes while maintaining their overall shape. Accordingly, without an additional subminiature optical disk drive, a subminiature optical disk can be driven using a conventional standard optical disk drive.Type: ApplicationFiled: June 7, 2007Publication date: April 3, 2008Inventors: Mun Cheol Paek, Kwang Yong Kang
-
Patent number: 7283705Abstract: Provided is a planar focusing grating coupler, comprising: a light waveguide including a cladding layer and a core layer formed on a substrate and maintaining incident laser light in a single mode; and a focusing grating coupler formed to have a predetermined grating pitch at a certain area over the core layer, wherein the light using to the light waveguide forms a focal point with the grating layer in the direction perpendicular to the focusing grating coupler, whereby an ultra small pickup head for a mobile optical disk can be used.Type: GrantFiled: August 9, 2004Date of Patent: October 16, 2007Assignee: Electronics and Telecommunications Research InstituteInventors: Mun Cheol Paek, Yeung Joon Sohn, Dong Woo Suh, Ho Jun Ryu, Hyeon Bong Pyo, Yong Woo Park
-
Publication number: 20070136737Abstract: Provided are a hub for chucking an optical disk to a disk table of a recording/reproducing apparatus using a magnetic attraction force, and a small form factor optical disk for information storage including the hub. The hub is made of a magnetic metal-polymer composite material. The optical disk includes: a disk plate having a central through-hole and a recess, lower than an edge, formed around the through-hole; and a hub made of a magnetic metal-polymer composite material and inserted into the through-hole to be coupled to the disk plate.Type: ApplicationFiled: July 10, 2006Publication date: June 14, 2007Inventors: Ho Jun Ryu, Yong Goo Yoo, Woo Seok Cheong, Eun Kyoung Kim, Mun Cheol Paek, Kwang Yong Kang
-
Recording layer of magneto-optical storage medium having sublayer and method of fabricating the same
Patent number: 7153540Abstract: A recording layer of a magneto-optical storage medium having a sublayer in accordance with the present invention comprises a recording layer on which information is recorded and stored; and a sublayer formed above or below the recording layer and made up of an alloy containing a transition metal, wherein a magnetic anisotropy energy of the sublayer is exchange-coupled to the recording layer, thereby enhancing a coercive force of the recording layer. The sublayer may be formed in a single-layered structure having one layer, or in a multi-layered structure having a plurality of layers. The sublayer is preferably made up of an alloy containing a transition metal used for the recording layer. According to the present invention, the coercive force of the recording layer can be increased by an exchange coupling effect between the recording layer and its adjacent sublayer, and thus, the stability of the magnetic domain in the recording layer can be improved.Type: GrantFiled: November 24, 2003Date of Patent: December 26, 2006Assignee: Electronics and Telecommunications Research InstitiuteInventors: Dong Woo Suh, Ho Jun Ryu, Yeung Joon Sohn, Yong Woo Park, Mun Cheol Paek -
Patent number: 6999660Abstract: Provided is a focusing waveguide grating coupler using a leaky mode which can form single output beam while relieving the dependency on manufacturing processes.Type: GrantFiled: December 31, 2003Date of Patent: February 14, 2006Assignee: Electronics and Telecommunications Research InstituteInventors: Yongwoo Park, Yeungjoon Sohn, Mun-Cheol Paek, Dong Woo Suh, Hojun Ryu, Hyeon-Bong Pyo
-
Publication number: 20050008294Abstract: Provided is a focusing waveguide grating coupler using a leaky mode which can form single output beam while relieving the dependency on manufacturing processes.Type: ApplicationFiled: December 31, 2003Publication date: January 13, 2005Inventors: Yongwoo Park, Yeungjoon Sohn, Mun-Cheol Paek, Dong-Woo Suh, Hojun Ryu, Hyeon-Bong Pyo
-
Recording layer of magneto-optical storage medium having sublayer and method of fabricating the same
Publication number: 20040115482Abstract: A recording layer of a magneto-optical storage medium having a sublayer in accordance with the present invention comprises a recording layer on which information is recorded and stored; and a sublayer formed above or below the recording layer and made up of an alloy containing a transition metal, wherein a magnetic anisotropy energy of the sublayer is exchange-coupled to the recording layer, thereby enhancing a coercive force of the recording layer. The sublayer may be formed in a single-layered structure having one layer, or in a multi-layered structure having a plurality of layers. The sublayer is preferably made up of an alloy containing a transition metal used for the recording layer. According to the present invention, the coercive force of the recording layer can be increased by an exchange coupling effect between the recording layer and its adjacent sublayer, and thus, the stability of the magnetic domain in the recording layer can be improved.Type: ApplicationFiled: November 24, 2003Publication date: June 17, 2004Inventors: Dong Woo Suh, Ho Jun Ryu, Yeung Joon Sohn, Yong Woo Park, Mun Cheol Paek -
Patent number: 6693705Abstract: The present invention relates to an apparatus for measuring a slant angle in a solid immersion lens. In a near-field optical data storage head for storing/reading data using a solid immersion lens (SIL), a parallel light is formed within the plane of the solid immersion lens and the slant angle of the parallel light is then measured using the angle measurement principle of the autocollimator in order to measure the slant angle of the solid immersion lens. For this, the present invention includes an optical system for generating the parallel light within the solid immersion lens, and a unit for measuring the slant angle of the solid immersion lens using a location detection unit. An incident light becomes the parallel light by the optical system and the curved face of the solid immersion lens. The reflected light is also focused on the location detection unit. The location detection unit converts the reflection angle of the reflecting light into a location value to calculate the angle value.Type: GrantFiled: June 4, 2002Date of Patent: February 17, 2004Assignee: Electronics and Telecommunications Research InstituteInventors: Yeung Joon Sohn, Gee Pyeong Han, Yark Yeon Kim, Tae Youb Kim, Mun Cheol Paek, Kyoung Ik Cho
-
Patent number: 6648712Abstract: A triode-type field emission device includes an insulating substrate; a cathode formed on the insulating substrate; a field emitter aligned on the cathode, wherein the field emitter includes a plurality of emitter tips and each emitter tip has the diameter of nanometers; an insulating layer positioned around the field emitter for electrically isolating the field emitter; and a gate electrode formed on the insulating layer, wherein the gate electrode is closed to an upper portion of the field emitter. Therefore, the triode-type field emission device may be operable in a low voltage.Type: GrantFiled: October 2, 2002Date of Patent: November 18, 2003Assignee: Electronics and Telecommunications Research InstituteInventors: Sung-Yool Choi, Mun-Cheol Paek, Kyoung-Ik Cho, Jeen Hur, Gi-Pyung Han
-
Publication number: 20030123053Abstract: The present invention relates to an apparatus for measuring a slant angle in a solid immersion lens. In a near-field optical data storage head for storing/reading data using a solid immersion lens (SIL), a parallel light is formed within the plane of the solid immersion lens and the slant angle of the parallel light is then measured using the angle measurement principle of the autocollimator in order to measure the slant angle of the solid immersion lens. For this, the present invention includes an optical system for generating the parallel light within the solid immersion lens, and a unit for measuring the slant angle of the solid immersion lens using a location detection unit. An incident light becomes the parallel light by the optical system and the curved face of the solid immersion lens. The reflected light is also focused on the location detection unit. The location detection unit converts the reflection angle of the reflecting light into a location value to calculate the angle value.Type: ApplicationFiled: June 4, 2002Publication date: July 3, 2003Inventors: Yeung Joon Sohn, Gee Pyeong Han, Yark Yeon Kim, Tae Youb Kim, Mun Cheol Paek, Kyoung Ik Cho