Samsung Electronics Co., Ltd.

Seagate Technology Incorporated

Yong-su Kim

Seung-bum Hong

Hyoung-soo Ko

Hong-sik Park

Woo-yong Park

Geun-yong Park

Joong-gwang Shin

Geun-Yong Park

Hyun-seong Shin

Ju-hwan Jung

Chee-kheng Lim

Sung-Chul Lee

Sung-hoon Choa

Jong-woo Kim

In-yong Song

Kyu-cheol Shin

Kwang-ho No

Jin-geun Kwak

Woo-chul Jung

Jun-Hee Cho

Seung-young Byun

Hyong-gu Lee

Wan-Ha Kim

Sam-seuk Choi

Jun-hee Cho

In-Sub Yoo

Ki-hyun Chyun

A telephoto lens system including a first lens group having a positive refractive power and including a negative lens that is disposed closest to an object side and has a meniscus shape that is convex toward the object side; a second lens group having a negative refractive power and including a single negative lens that moves along an optical axis and performs focusing; and a third lens group having a positive refractive power, wherein the first through third lens groups are disposed sequentially from the object side toward the image side, and the telephoto lens system satisfies the following condition, 0.5&#x3c;|f/f|&#x3c;0.81, wherein, fdenotes the focal length of the second lens group, and f denotes the focal length of the telephoto lens system.

Telephoto lens system

Provided is an electric field information reading head for reading information from a surface electric charge of an information storage medium, the electric field information reading head comprising a semiconductor substrate having a resistance region formed in a central part at one end of a surface facing a recording medium, the resistance region being lightly doped with impurities, and source and drain regions formed on both sides of the resistance region, the source region and the drain region being more highly doped with impurities than the resistance region. The source region and the drain region extend along the surface of the semiconductor substrate facing the recording medium, and electrodes are connected electrically with the source region and the drain region respectively. In addition, provided is a method of fabricating the electric field information reading head and a method of mass-producing the electric field information reading head on a wafer.

Electric field information reading head, electric field information writing/reading head and fabrication methods thereof and information storage device using the same

A photo spinner apparatus, including a spin coater for coating a plurality of wafers with photoresist, a bake device for hardening the photoresist coated by the spin coater, a developer for developing the photoresist hardened in the bake device, a transfer unit for transferring the plurality of wafers between the developer, the bake device, and the spin coater, and an indexer including a wafer carrier loader to vertically stack a plurality of wafer carriers into which the plurality of wafers transferred by the transfer unit are loaded.

Photo spinner apparatus and wafer carrier loading/unloading method using the same

Provided are a data storage device using a magnetic domain wall movement and a method of operating the data storage device. The data storage device includes a magnetic layer including a plurality of magnetic domains, first and second ferromagnetic pinned layers formed on lower and upper surfaces of the magnetic layer, respectively, and having opposite magnetization directions, first and second insulating spacers interposed between the first and second ferromagnetic pinned layers and the magnetic layer, respectively, and an energy supplying unit applying energy to the magnetic layer for a magnetic domain wall movement.

Data storage device using magnetic domain wall movement and method of operating the same

A data storage device includes a magnetic layer having a plurality of magnetic domains, a write head provided at an end portion of the magnetic layer, a read head to read data written to the magnetic layer, and a current controller connected to the write head and the read head. A method of operating the data storage device includes reading data of an end portion of the magnetic layer using a read head provided at the end portion of the magnetic layer in which a write head is provided at the other end portion thereof, moving a magnetic domain wall of the magnetic layer by a distance corresponding to the length of one magnetic domain toward the end portion, and writing the read data to the other end portion of the magnetic layer using the write head and a current controller provided between the write head and the read head.

Data storage device using magnetic domain wall movement and method of operating the data storage device

A semiconductor device includes a magnetic wire having a plurality of magnetic domains, wherein the magnetic wire comprises a magnetic domain wall that is moved by either a pulse field or a pulse current. The magnetic wire of the semiconductor device does not require an additional notch since the magnetic wire includes a magnetic domain wall, the moving distance of which is controlled by a pulse field or a pulse current.

Semiconductor device using magnetic domain wall moving

An electric field read/write head, a method of manufacturing the same, and a data read/write device including the electric field read/write head are provided. The data read/write device includes an electric field read/write head which reads and writes data to and from a recording medium. The electric field read/write head includes a semiconductor substrate, a resistance region, source and drain regions, and a write electrode. The semiconductor substrate includes a first surface and a second surface with adjoining edges. The resistance region is formed to extend from a central portion at one end of the first surface to the second surface. The source region and the drain region are formed at either side of the resistance region and are separated from the first surface. The write electrode is formed on the resistance region with an insulating layer interposed between the write electrode and the resistance region.

Electric field read/write head and method of manufacturing same and data read/write device

A paper guide device which guides a sheet of paper fed to a nip between an image belt and a transfer roller and an image forming apparatus including the same. The paper guide device includes a first convey guiding unit arranged within a predetermined space from an image belt to firstly guiding the paper to a nip between the image belt and a transfer roller. A second convey guiding unit is arranged on the first convey guiding unit to contact the image belt to secondly guide the paper to the nip without contacting the image belt. The device accurately guides the paper to the nip without contacting the image transfer belt.

Paper guide device and image forming apparatus having the same

An apparatus prevents developer wraparound in a wet electrophotographic printer using wraparound preventing units. Each of the wraparound preventing units has varied diameter parts formed at both ends of a developing roller, and matching parts formed at both ends of a metering roller to correspond to the varied diameter parts of the developing roller. Since the varied diameter parts and the matching parts are respectively installed at both ends of the developing roller and the metering roller, developer wraparound is not generated in the developing roller and a photosensitive roller during development.

Apparatus for preventing developer wraparound in wet electrophotographic printer

A liquid image developing system, including a cartridge in which a developer is stored; a supply line; a development container to which the developer is supplied from the cartridge through the supply line; a photosensitive body in the development container; a development roller partially soaked in the developer in the development container and rotating opposite to the photosensitive body; a depositing member to create a potential difference required to attach the developer to a circumference of the development roller, opposite to the development roller; a metering blade to scratch the developer attached to the circumference of the development roller to a predetermined thickness; and an agitator to agitate the developer contained in the development container. Accordingly, a high-concentration developer can be directly used in the development operation without a dilution operation, and thus the structure to supply the developer can be considerably simplified.

Liquid image developing system having development roller partially soaked in developer

A liquid developer imaging system and a method using the system for developing an image, including a cartridge for containing a developing solution; a developing container for receiving the developing solution supplied from the cartridge via a predetermined supply line; a developing roller partly submerged in the developing solution contained in the developing container, installed to be rotated facing a photosensitive object; and a metering blade for scraping off the developing solution coated on the surface of the developing roller to a predetermined thickness, is provided. According to the system, a developing supply structure can be considerably simplified because a high-density developing solution is directly used in developing an image without a process of diluting the solution, and an image can be developed to have high definition because the concentration of the developing solution coated on the developing roller is regularly controlled by a metering blade.

Liquid developer imaging system

A liquid image forming apparatus. A developing unit of the liquid image forming apparatus includes a developing container in which a developer is received, a developing roller having a portion which is dipped in the developer of the developing container, which is installed to be opposite to a photosensitive body, a cleaning roller which cleans the developer remaining on the surface of the developing roller after an electrostatic latent image is developed, and a squeeze roller which squeezes the cleaning roller before the developing roller is cleaned, and passes the air passing through the cleaning roller to the outside. The air passing through the cleaning roller does not pass into the developer and thus bubbles are not generated in the developer, thereby solving a problem of non-uniform developer attachment.

Liquid image forming apparatus having squeeze unit

A developing system of a liquid electrophotographic image forming device. The developing system includes a development container in which a developer is stored, a development roller which rotates opposite to a photosensitive body, and being partially soaked in the development container, and a metering blade. The metering blade has a first face contacting the circumference of the development roller and a second face by which a predetermined angle is formed with respect to the first face, which maintains a developer layer on the circumference of the development roller at a predetermined thickness. By optimizing related parameters of the metering blade, the developer layer on the development roller can be regulated, thereby achieving good image quality.

Developing system having metering blade with spaced intersecting faces

The present invention provides an ink delivery system and an ink delivery method of a liquid-type electrophotographic printer which are adapted to detect whether or not liquid in any one of containers which supply ink and a solvent to circulation tanks is exhausted without installing separate level sensors.

Ink delivery system and ink delivery method of liquid -type electrophotographic printer

A developing system of a liquid electrophotographic image forming device includes a developer reservoir in which a developer is stored, a development container in which the developer is supplied from the developer reservoir, a development roller rotating opposite to a photosensitive drum in the development container, and a pumping portion connected between the development container and the developer reservoir via connection pipes. The pumping portion supplies the developer to the development container from the developer reservoir or exhaust the developer from the development container and return the developer to the developer reservoir. Accordingly, the developer supplying and exhausting unit of the developing system can be simplified.

Growing community of inventors

Yongin-si, South Korea

Yong-su Kim