Abstract: A coupling structure usable with an image forming apparatus which includes a hopper frame to accommodate toner and an agitator, a development frame coupled to the hopper frame and installed with a developing roller and a supply roller to supply the toner to the developing roller, a plurality of gears to rotate and drive each of the agitator, the developing roller, and the supply roller, a first coupling protrusion to protrude from an outer surface of the development frame, and a development cap member coupled to the outer surface of the development frame and having first and second bushings to rotatably support the developing roller and the supply roller and a coupling portion into which the first coupling protrusion is inserted.

Abstract: 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.

Abstract: In a method and apparatus for processing a packet in an IPv4/IPv6 combination network, packet overhead is minimized by identifying a tunnel session through a flow label field of an IPv6 header in a tunnel section when the packet is forwarded in a tunneling manner depending on a resource reservation protocol (RSVP) in the IPv4/IPv6 combination network.

Abstract: A convergence compensation apparatus includes a memory for storing a manual convergence compensation data which is preset by a user, and a convergence control unit for applying the manual convergence compensation data and an automatic convergence compensation data generated by the automatic color coincidence task, and for allowing a convergence distortion of the projection television to be compensated.

Abstract: A projection TV is provided comprising a reflective mirror including an ultra-thin glass substrate having enhanced strength, a reflective layer formed on a surface of the glass substrate to reflect an image, and a protective layer applied to an upper surface of the reflective layer to prevent the reflective layer from being damaged. The reflective mirror minimizes the occurrences of a double image, and a focus characteristic and contrast are enhanced, thereby improving the image quality. In addition, it is possible to make the product lightweight and thus, reduce transportation charges and other manufacturing costs.

Abstract: A lenticular lens sheet having a wide viewing angle, good uniformity, high resolution, and a manufacturing method thereof. The method for manufacturing the lenticular lens sheet includes the steps of preparing a body of the lenticluar lens sheet having on one side thereof a plurality of incoming-side lenticluar lenses which diffuse incident light from at least one light source, laminating a photoresist layer on the other side of the lenticular lens sheet, exposing a part of the photoresist layer to light, and removing the exposed portion to form an anti-reflection layer having a light transmitting portion and an anti-reflecting portion of external light.

Abstract: A liquid crystal display apparatus includes a front cover on which an opening edge is formed, a display panel provided on a back of the front cover, a screen protector provided between the front cover and the display panel to protect the display panel, and a rear cover coupled to the back of the front cover. Thus, the liquid crystal display apparatus may have a simplified installation structure of the screen protector.

Abstract: A display device usable outdoors includes a display part to form a picture thereon, a housing to accommodate the display part and having an opening through which the display part is mounted, a protecting member installed in the opening part of the housing to protect the display part, a heat exchanger mounted within the housing to cool down an inside of the housing, and a non-reflecting coating part disposed on the protecting member to prevent a drop in brightness of the display part due to solar light. Accordingly, the display device usable outdoors prevents a drop in the brightness and a rise in temperature of the display part.

Abstract: A rear projector that can be made slim and compact and can prevent image reversal. The rear projector includes a cathode ray tube to scan light and generate an image, a projection lens unit to magnify and project the image generated by the cathode ray tube, a screen on which the projected image is formed, and a reflection optical system interposed between the projection lens unit and the screen to change a path of projected light. The cathode ray tube and the reflection optical system are arranged such that a raster direction of the cathode ray tube and a direction along which the image is formed on the screen are parallel or substantially parallel to each other.

Abstract: A projection apparatus includes a plurality of display devices to generate different color images, a plurality of projection lens units to magnify and project the images generated from the display devices, and a screen to display the projected images. The display devices are three-dimensionally arranged such that the display devices are concentrated around a reference axis that is a central axis of an arrangement of the display devices.

Abstract: 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.

Abstract: A wireless transmitting and/or receiving system and method of sharing analog information between a transmitter and a receiver connected to the transmitter by a wireless channel. The wireless transmitting and/or receiving system includes a transmitter that extracts analog signal and information from an analog broadcast signal, converts the analog signal into a transport stream that is then sent to a first wireless channel, transmits the analog information to a second wireless channel when the analog information is extracted, and updates previously stored first analog information with the received analog information, and a receiver that decodes the transport stream received from the transmitting means via the first wireless channel and updates previously stored second analog information with the analog information received by the second wireless channel.

Abstract: 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.

Abstract: An image forming apparatus and method are disclosed. The image forming apparatus comprises a photosensitive medium being formed an electrostatic latent image thereon; a developing roller developing a developer to the photosensitive drum being formed an electrostatic latent image; and a remnant developer sensing device sensing an electrical value between the developing roller and the photosensitive medium and determining the remaining amount of the developer of the developing device.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Disclosed is a method for preparing polyester resins copolymerized with glycol for modification such as 1,4-cyclohexanedimethanol, in which the content of said glycol ingredient for modification ranges from 20 to 80 mol % of the total glycol content. Dicarboxylic acid such as terephthalic acid is esterified with ethylene glycol and said glycol for modification. The esterification product is subjected to polycondensation in the presence of a titanium dioxide/silicon dioxide coprecipitate catalyst, said catalyst being in the form of 4% or less strength by weight suspension in glycol. The copolyester prepared as above shows excellent transparency and color properties in addition to being produced at high efficiency.