Abstract: Disclosed is a cooling pack for a head including an outer cover fixed at an inside of the head protector. The outer cover adheres to a top of a human body, a refrigerant is embedded in the outer cover, and a plurality of fixers are coupled to the outer cover. The fixers are attachable to or detachable from the head protector, and the refrigerant is formed of a polyester polymer powder.

Abstract: The present invention relates to a multifunctional safety helmet. To this end, the multifunctional safety helmet comprises an outer cap and an inner cap inserted into the outer cap, wherein the inner cap includes: a first air passage formed forward and rearward across the upper surface thereof; a cooling fan mounted on the center of the first air passage to blow heat, dissipated from a head, upward in order to transfer the heat toward the first air passage; and an air circulation vent formed on the front side of the first air passage to guide some air toward the forehead.

Abstract: A ceramic printed circuit board (PCB) and an inkjet printhead assembly using the ceramic PCB. A ceramic PCB in which a plurality of layers are stacked includes a plurality of terminals to receive an electric signal from an external source, a plurality of circuit patterns connected to the plurality of terminals to transmit the electric signal, and a termination resistor having a predetermined thickness disposed between the plurality of circuit patterns, wherein the termination resistor is mounted between the plurality of stacked layers.

Abstract: An electronic apparatus capable of preventing a peak current from being introduced into internal units of the electronic apparatus when the internal units are simultaneously activated and a method to control one or more internal units thereof. The electronic apparatus includes at least one internal unit and a signal generator to generate a drive pulse having a width that gradually changes in an edge region and to drive the at least one internal unit. Accordingly a peak current is prevented from being introduced into the internal units by gradually increasing or decreasing the drive pulse to drive the internal units as time changes or by dividing the internal units into a block unit and sequentially providing the drive pulse to the internal units.

Abstract: An inkjet image forming apparatus includes a print head, an ink supply unit, an ink supply flow path connecting the ink supply unit and the print head, an ink supply amount detector which detects the amount of ink supplied through the ink supply flow path, and a controller which controls a maintenance operation of the print head according to the amount of supplied ink detected by the ink supply amount detector. The controller determines the states of nozzles of the print head according to the amount of supplied ink and cleans the nozzles using supersonic waves or performs wiping and spitting of the nozzles, thereby achieving efficient maintenance.

Abstract: A data interfacing apparatus and method of a print head chip are provided. The data interfacing apparatus includes a drive module to output a low-speed signal with a slow transmission speed and a high-speed signal requiring a fast transmission speed, a connection cable transmitting the low-speed signal and the high-speed signal, and a print head chip to operate in response to the low-speed signal and the high-speed signal transmitted through the connection cable, wherein the drive module includes multiplexers to perform a switching operation so that the connection cable is earthed to a ground in response to the high-speed signal, and wherein the print head chip includes de-multiplexers to perform a switching operation in response to the operation of the multiplexers.

Abstract: A line printing type inkjet image forming apparatus and a method of enhancing printed image quality. The inkjet image forming apparatus includes a printhead having one or more subheads having nozzles and a length corresponding to a width of a print medium, a driving unit to drive the nozzles, a first feeding path, a second feeding path through which the print medium is guided to be again fed along the first feeding path, a path conversion guide unit being disposed in a position where the first and second feeding paths intersect to guide the print medium to be discharged or fed along the second feeding path, a print medium feeding unit, and a controller to synchronize operations of the driving unit, the path conversion guide unit, and the print medium feeding unit, wherein the controller drives the nozzles and the nozzles divided in groups in the same direction time-divisionally.

Abstract: A ceramic printed circuit board (PCB) and an inkjet printhead assembly using the ceramic PCB. A ceramic PCB in which a plurality of layers are stacked includes a plurality of terminals to receive an electric signal from an external source, a plurality of circuit patterns connected to the plurality of terminals to transmit the electric signal, and a termination resistor having a predetermined thickness disposed between the plurality of circuit patterns, wherein the termination resistor is mounted between the plurality of stacked layers.

Abstract: An inkjet image forming apparatus includes a print head, an ink supply unit, an ink supply flow path connecting the ink supply unit and the print head, an ink supply amount detector which detects the amount of ink supplied through the ink supply flow path, and a controller which controls a maintenance operation of the print head according to the amount of supplied ink detected by the ink supply amount detector. The controller determines the states of nozzles of the print head according to the amount of supplied ink and cleans the nozzles using supersonic waves or performs wiping and spitting of the nozzles, thereby achieving efficient maintenance.

Abstract: A method and apparatus to detect the temperature of an inkjet head are provided. A method of detecting the temperature of an inkjet head, comprising detecting an amount of printing data allocated to each of a plurality of unit head chips of the inkjet head, determining a detection frequency of temperature information on each of the plurality of unit head chips according to the detected amount of printing data, and detecting the temperature information on each of the plurality of unit head chips according to the determined detection frequency.

Abstract: An electronic apparatus capable of preventing a peak current from being introduced into internal units of the electronic apparatus when the internal units are simultaneously activated and a method to control one or more internal units thereof. The electronic apparatus includes at least one internal unit and a signal generator to generate a drive pulse having a width that gradually changes in an edge region and to drive the at least one internal unit. Accordingly a peak current is prevented from being introduced into the internal units by gradually increasing or decreasing the drive pulse to drive the internal units as time changes or by dividing the internal units into a block unit and sequentially providing the drive pulse to the internal units.

Abstract: A data interfacing apparatus and method of a print head chip are provided. The data interfacing apparatus includes a drive module to output a low-speed signal with a slow transmission speed and a high-speed signal requiring a fast transmission speed, a connection cable transmitting the low-speed signal and the high-speed signal, and a print head chip to operate in response to the low-speed signal and the high-speed signal transmitted through the connection cable, wherein the drive module includes multiplexers to perform a switching operation so that the connection cable is earthed to a ground in response to the high-speed signal, and wherein the print head chip includes de-multiplexers to perform a switching operation in response to the operation of the multiplexers.

Abstract: A power control apparatus and method includes a power detector to detect a power supplied to an image forming apparatus, an information storing unit to store information on a printhead, and an auxiliary power supply unit to supply an auxiliary power to the information storing unit in response to a detection result detected by the power detector.

Abstract: A line printing type inkjet image forming apparatus and a method of enhancing printed image quality. The inkjet image forming apparatus includes a printhead having one or more subheads having nozzles and a length corresponding to a width of a print medium, a driving unit to drive the nozzles, a first feeding path, a second feeding path through which the print medium is guided to be again fed along the first feeding path, a path conversion guide unit being disposed in a position where the first and second feeding paths intersect to guide the print medium to be discharged or fed along the second feeding path, a print medium feeding unit, and a controller to synchronize operations of the driving unit, the path conversion guide unit, and the print medium feeding unit, wherein the controller drives the nozzles and the nozzles divided in groups in the same direction time-divisionally.

Abstract: In an image forming apparatus using an engine part which is capable of moving in the width direction of paper fed in the print direction, a printing method has the steps of measuring a position in the width direction of paper fed in the print position, comparing measured position value with a preset reference position value, compensating a position to be printed based on the compared difference, and printing on the paper based on the compensated position data.

Abstract: A method of determining missing nozzles in an inkjet printer involving: printing a rectangular test pattern on a printing paper by using each nozzle or each group of nozzles of a printhead, and scanning the rectangular test pattern printed on the printing paper by using an optical sensor, which is an automatic alignment sensor.