Samsung Electronics Co., Ltd.

Lg Electronics Inc.

Hewlett-Packard Development Company, L.p.

Sung-gi Kim

Donghan Kim

Sang-hoon Lee

Tae-Sung Kim

Jong-in Kim

Sung-wook Kang

Young-chae Kim

In-kyun Shin

Dong-cheol Ahn

Joon-hee Kim

Seok-il Yoon

Gyu-hwan Hwang

Seong-yong Moon

Suk-sun Lee

Sung-chul Lim

Young-il Kah

Jong-wook Kye

Deug-hyun Choi

Dong-Han Kim

A developing device that attaches/detaches to/from a main body of an image forming apparatus includes a photosensitive drum, a charging roller to rotate while contacting the photosensitive drum to charge a surface of the photosensitive drum to a uniform potential, and a separating member to rotate between a first position where the charging roller is separated from the photosensitive drum and a second position where the charging roller contacts the photosensitive drum. The separating member includes a body into which a rotary shaft of the charging roller is inserted to be rotatable, and a contact portion extending from the body and contacting the surface of the photosensitive drum when the separating member is located at the first position so as to separate the charging roller from the photosensitive drum, wherein the contact portion includes a friction member including rubber.

Developing device and image forming apparatus including the same

A reciprocating compressor comprises: a cylinder having an oil pocket on an inner circumferential surface of a piston insertion hole for inserting a piston with a predetermined width and depth; and a piston having a bearing portion protruding so as to slidably contact an inner circumferential surface of the piston insertion hole, and inserted into the piston insertion hole of the cylinder, wherein the bearing portion is formed to have a length shorter than that of the oil pocket of the cylinder. Accordingly, a frictional loss between the cylinder and the piston is reduced.

Reciprocating compressor

A flat display including a display main body to receive a display panel to display an image and a receiving member which is formed with receiving holes disposed at opposite lateral sides of the display main body.

Flat display and flat display apparatus having the same

A developing cartridge includes an agitator including a pair of ribs to effectively force a toner to a center of a flexible agitator film. In the developing cartridge of an electrophotographic image forming apparatus including a housing containing the toner, a developing roller disposed such that a portion thereof is exposed to the housing, and the agitator which is provided in the housing and feeds the toner to the developing roller, the agitator includes a body, the flexible agitating film including a coupling groove and attached to the body, a hook provided on the body and inserted into the coupling groove, and the pair of ribs provided on the body.

Developing cartridge and electrophotographic image forming apparatus including the same

Provided are a projection optical system, a projection television, and a method of manufacturing a lens included in the projection optical system. The projection optical system includes lenses for projecting color beams onto a screen. A color filter layer, absorbing at least one of the color beams, is coated on the surface of at least one of the lenses.

Projection optical system, projection television, and method of manufacturing lens included in projection optical system

Provided is an image display screen having wide horizontal and vertical viewing angles and a projection television including the same. The image display screen includes a Fresnel screen, a first lenticular screen that widens a horizontal viewing angle and a second lenticular screen including a first portion that widens a vertical viewing angle and a second portion that prevents degradation of contrast due to external light, and a protective screen. The second lenticular screen and the protective screen can be replaced by an integrated screen or a composite screen having the characteristics of both. In addition, a pattern may be formed on the rear surface of the Fresnel screen to perform the same function as the first portion.

Image display screen having wide vertical and horizontal viewing angles and projection television including the same

A projection display apparatus with red (R), green (G), and blue (B) monochromatic cathode ray tubes (CRTs) and three projection lenses, disposed in front of the R, G, and B monochromatic CRTs respectively, along with a screen having a predetermined curvature concave in a view direction to control a view distance and focus the light rays projected from the respective projection lenses. The screen includes a Fresnel screen converting the light rays incident from the projection lenses to have predetermined optical directional characteristics in an optical axis direction, and a Lenticular screen, disposed in front of the Fresnel screen and having a curvature corresponding to the Fresnel screen, for forming images from the light rays passing through the Fresnel screen, controlling a view angle, and enhancing an entire screen luminance. The view distance is determined based on a focal length and a curvature radius of the Fresnel screen.

Projection display apparatus with a curved screen

A display apparatus has a monitor body. The display apparatus includes a supporting part disposed in the monitor body; a stand having an mounting part mutually coupled to the supporting part; and an elastic member interposed between the supporting part and the mounting part. Here, the display apparatus in which the monitor body is easily coupled to the stand thereof is provided.

Display apparatus

Methods of forming half-tone phase-shift masks include the steps of forming a series of layers on a face of a transparent substrate such as quartz. These layers include a phase-shift layer of MoSiON, a layer of opaque material (e.g., chrome) for blocking light on the phase-shift layer and a photoresist layer on the layer of opaque material. The photoresist layer is then patterned to define a mask having openings therein which expose the layer of opaque material. The layer of opaque material is then patterned using a wet etchant, to expose portions of the phase-shift layer. The patterned photoresist layer is then stripped and a cleaning step is then performed to remove residual defects and marks from the patterned layer of opaque material. The patterned layer of opaque material is then used as a mask during the step of anisotropically dry etching the phase-shift layer using a gas containing CF.sub.4 and O.sub.2, but not CHF.sub.3. The use of a gas containing CF.sub.4 and O.sub.2 inhibits parasitic sputtering of chrome from the patterned layer of opaque material onto the exposed portions of the face of the transparent substrate, during the dry etching step. In contrast, the use of a gas containing CHF.sub.3 and O.sub.2 during dry etching of the phase-shift layer may cause the formation of parasitic defects containing chrome on the face of the transparent substrate. These parasitic defects typically cause a reduction in yield when the phase-shift mask is used in the formation of integrated circuits.

Methods of forming half-tone phase-shift masks with reduced

A heat fixing roller in an electrophotographic recording system provides a high degree of radiating efficiency and reduces the amount of time it takes for the heat fixing roller to achieve a temperature necessary to perform a printing operation. The heat fixing roller has a heat lamp installed along a center axis within an interior portion of the heat fixing roller. A plurality of hollowed-out heat conduits extend outwardly in a radial manner from the heat lamp to provide a path through which heat generated by the heat lamp can radiate to rapidly increase the temperature of an outer surface of the heat fixing roller.

Growing community of inventors

Seoul, South Korea

Sung-gi Kim