Abstract: In an electrophotographic printer including a photosensitive drum unit having a photosensitive drum, a plurality of development units each having a developing roller, an intermediate transfer unit having a transfer belt to which an image is transferred from the photosensitive drum, a waste toner storage container to store waste toner generated at the photosensitive drum unit and the intermediate transfer unit, and a sheet transport unit which finally holds the image. The electrophotographic printer also includes first through third doors provided to mount or dismount the plurality of development units, the photosensitive drum unit and intermediate transfer unit, and the waste toner storage container, respectively, and a fourth door provided to access the sheet transport unit.

Abstract: A waste toner transfer apparatus in an electrophotographic printer transfers waste toner removed by a cleaning unit from an image holding body where a toner image is temporarily held to a waste toner storage container. The waste toner transfer apparatus includes a duct connecting the cleaning unit and the storage container, a transfer unit installed in the duct and transferring the waste toner to the storage container, and an agitation member installed in the duct to move therein and guide the waste toner from the cleaning unit to the transfer unit.

Abstract: A waste toner transfer apparatus in an electrophotographic printer for transferring waste toner removed by a cleaning unit from an image holding body, where a toner image is temporarily held, to a waste toner storage container. The waste toner apparatus includes a duct for connecting the cleaning unit and the waste toner storage container, a transfer unit installed in the duct to transfer the waste toner, a guide portion provided at an outlet of the duct to be inclined downward to guide the waste toner toward the waste toner storage container, and an agitation member installed on the guide portion and moving to prevent the waste toner from accumulating on the guide portion.

Abstract: A waste toner transfer apparatus in an electrophotographic printer to transfer waste toner removed by a cleaning unit and transferred to a waste toner storage container. The waste toner transfer apparatus includes a duct connecting the cleaning unit and the waste toner storage container, a conveying coil having a spiral shape which is installed in the duct and rotates, and an insertion member inserted in the conveying coil.

Abstract: An electrophotographic printer including a pre-erasing unit. The pre-erasing unit includes a pre-erasing lamp to irradiate light, and a pre-transfer erasing lens to induce the light generated from the pre-transfer erasing lamp to the photosensitive drum, movably installed such that it moves to an erasure position at which the pre-transfer erasing lens is close to the photosensitive drum for erasure, and moves to a retracted position spaced apart from the photosensitive drum so as not to interfere therewith when the photosensitive drum unit is being mounted or dismounted. The pre-erasing unit may further include an elastic member to provide elasticity in a direction in which the pre-transfer erasing lens moves to the retracted position.

Abstract: An electrophotographic includes a main frame, a photosensitive drum unit having a photosensitive drum and vertically detachably installed on the main frame, a plurality of development units each having a developing roller and detachably installed on the main frame while sliding in a horizontal direction, and a first door openably installed for mounting or dismounting the plurality of development units.

Abstract: An electrophotographic includes a main frame, a photosensitive drum unit vertically detachably installed on the main frame and having a photosensitive drum on which an electrostatic latent image is formed, and an intermediate transfer unit vertically detachably installed on the main frame and having a transfer belt to which a toner image is transferred from the photosensitive drum, wherein the intermediate transfer unit is installed above the photosensitive drum unit.

Abstract: A printer having a paper guide structure, including a first feed roller to allow a paper supplied from a paper feeding portion to move along a transfer path. A second feed roller receives the paper transferred by the first feed roller and transfers the paper. A guide member is arranged between the first and second feed rollers along the transfer path and guides the paper. A door is installed at a main body of the printer to be opened and closed. An empty space is formed toward the door at the rear of the second feed roller so that, when the door is open and a leading end of the paper passing the second feed roller is pulled up, the paper is discharged along an outer circumferential surface of the second feed roller.

Abstract: An apparatus to transfer a color laser image including an intermediate transfer belt to rotatably travel along a loop by being wound around a plurality of guide rollers provided in a printer body frame; a transfer roller to pressurize and contact the intermediate transfer belt with a transfer nip, and to rotate to transfer the color image of the intermediate transfer belt to a printing paper; a transfer panel, positioned to rotatably open and close with respect to the printer body frame, to support the transfer roller to be rotatable; a separating unit to separate the transfer roller from the intermediate transfer belt at constant intervals or to pressurize the transfer roller to contact the intermediate transfer belt; and an aligning unit to align the transfer roller to maintain an accurate position of the transfer roller with respect to the intermediate transfer belt in the printer body frame.

Abstract: A drying unit and method of drying for a liquid electrophotographic printing apparatus, the drying unit that is equipped in the printing apparatus comprising a developing unit that develops an image on an photosensitive medium using a liquid carrier as a mediator and a transfer unit that transcribes the developed image on a printing paper, so that the liquid carrier remaining on the photosensitive medium can be dried. The drying unit for the liquid electrophotographic printing apparatus is positioned near the photosensitive medium and includes a manifold having an inlet and an outlet; an inlet-outlet channel being between the inlet and the outlet and connecting them; a gas flowing unit by which the gas in the manifold is discharged through the outlet and gas flows in the manifold through the inlet; a condenser that condenses the evaporated carrier discharged through the outlet; and a heater that heats the gases flowing in the manifold through the inlet.

Abstract: A photoreceptor web drying unit of a liquid electrophotographic printer includes a plurality of heating sources, installed close to but not contacting a photoreceptor web, for generating heat used for drying and vaporizing liquid carrier, a manifold, encompassing the heating sources, for collecting gas carrier vaporized by the heating sources, a circulation line, forming a closed loop connected to the manifold, for forming a path for circulation of the gas carrier collected in the manifold, an inlet duct, installed at the manifold to be connected to the circulation line, through which the gas carrier vaporized by the heating sources can flow, and a blowing duct, installed at the manifold to be connected to the circulation line, through which air can flow into the manifold. Thus, since the drying unit is formed in a non-contact method with respect to the photoreceptor web, images are not inadvertently picked-up by the drying unit.

Abstract: A semiconductor system having a master device and a slave device. The master device and the slave device are coupled together through the data bus and control signal line. The master device inputs a calibration signal to the slave device in response to the control signal. The voltage level of the data outputted from the slave device is corrected by the calibration operation.

Abstract: A photoreceptor web drying unit of a liquid electrophotographic printer includes a plurality of heating sources, installed close to but not contacting a photoreceptor web, for generating heat used for drying and vaporizing liquid carrier, a manifold, encompassing the heating sources, for collecting gas carrier vaporized by the heating sources, a circulation line, forming a closed loop connected to the manifold, for forming a path for circulation of the gas carrier collected in the manifold, an inlet duct, installed at the manifold to be connected to the circulation line, through which the gas carrier vaporized by the heating sources can flow, and a blowing duct, installed at the manifold to be connected to the circulation line, through which air can flow into the manifold. Thus, since the drying unit is formed in a non-contact method with respect to the photoreceptor web, images are not inadvertently picked-up by the drying unit.

Abstract: A drying unit and method of drying for a liquid electrophotographic printing apparatus, the drying unit that is equipped in the printing apparatus comprising a developing unit that develops an image on an photosensitive medium using a liquid carrier as a mediator and a transfer unit that transcribes the developed image on a printing paper, so that the liquid carrier remaining on the photosensitive medium can be dried. The drying unit for the liquid electrophotographic printing apparatus is positioned near the photosensitive medium and includes a manifold having an inlet and an outlet; an inlet-outlet channel being between the inlet and the outlet and connecting them; a gas flowing unit by which the gas in the manifold is discharged through the outlet and gas flows in the manifold through the inlet; a condenser that condenses the evaporated carrier discharged through the outlet; and a heater that heats the gases flowing in the manifold through the inlet.

Abstract: A memory device having a plurality of input/output (I/O) pads, comprising: a cell array which is divided into a plurality of cell regions; a data pad having the plurality of I/O pads, the pads being grouped into a plurality of pad groups in accordance with the cell regions; and an internal data line being divided into a plurality of line groups in accordance with the pad groups, each of line groups having a plurality of data lines being connected only to the I/O pads of corresponding one of pad groups.

Abstract: Delay Locked Loop device generates an internal clock by receiving an external clock. Multiplexer is provided to receive N delay signals outputted from the first to Nth delay elements which receives the external clock. The Delay Locked Loop device generates the internal clock by selecting one of the N delay signals. The phase of the internal clock follows the phase of the external clock.

Abstract: A mounting socket for a semiconductor package has socket leads that contact the semiconductor package's external leads. The semiconductor package has a package body surrounding a semiconductor chip, as well as internal and external leads. The external leads are formed in an ingot shape and project outwardly from the package body, and are adapted to connect with the socket leads or external terminals. The external leads contact external walls of the package body, thereby preventing undesired bending or breaking of the leads when the package is handled. Fixing and reworking of the package in the socket is easy, since the semiconductor package is inserted into grooves in the socket. It is possible to stack-mount or side-by-side-mount the package, depending on the socket shape, thus improving socket density and making the arrangement suitable for miniaturization.

Abstract: An input buffer of memory device for reducing current consumption in standby mode comprising a bus input buffer for inputting successive bus data signals through a bus and buffering the inputted bus data signals, and a flag buffer for generating a control signal in response to a system clock signal and a flag signal indicative of a bus data input time point to operate the bus input buffer before a first one of the bus data signals arrives at the bus input buffer and to allow the bus input buffer to enter a standby mode at once after the bus data signal input is completed, the flag signal being enabled before the first bus data signal is inputted and disabled before the bus data signal input is completed. According to the present invention, signal increase can be suppressed and power consumption can be reduced.

Abstract: An oscillating device is disclosed including a first ring oscillator having at least three odd inverters connected in series, an input terminal of the first of the inverters being connected with an output terminal of the last of the inverters, and applying an output signal of the last inverter to a first buffer's input terminal, thus producing a signal of the first cycle; the first buffer connected with the output terminal of the first ring oscillator's last inverter, having at least two even inverters connected in series, and buffering an output signal of the last inverter to produce it to outside; a second ring oscillator having at least three odd delay devices connected in series, wherein a power supply of each delay device is connected with the output terminal of each of the first ring oscillator's corresponding inverters, and an output terminal of the last of the delay devices is connected with an input terminal of the first of the delay devices, thus producing a signal of the second cycle, larger than t

Abstract: A semiconductor device having a refresh device of a noise reduction type lowers a peak current value by sequentially performing refresh operations about a plurality of dynamic RAMs (DRAMs) in a system having a daisy chain structure, thereby reducing noises generated from the system.