Abstract:
Disclosed are a carrier substrate including an insulating base material with a copper foil layer formed on at least one surface thereof, a metal layer formed on the cooper layer and having a length shorter than that of the copper foil layer, and an insulating layer formed on the metal layer, a fabrication method thereof, a printed circuit board (PCB) using the same, and a fabrication method thereof. Because there is no land at the via and core in the substrate, because a circuit pattern connected with the via can be formed to be finer, so the circuit pattern can be highly integrated and the substrate can become thinner. Thus, a printed circuit board (PCB) having a smaller size and reduced number of layers can be fabricated.
Abstract:
A transfer apparatus includes at least four fine actuators each having a coil assembly with a wound coil, and a pair of movable magnets having different polarities and spaced from each other to interpose the coil assembly therebetween, a coil supporter to support the at least four coil assemblies so that the fine actuators are arranged in a pair of groups thereof symmetrically with respect to a predetermined straight line, a magnet supporter to support the at least four movable magnets corresponding to the respective coil assemblies, and a controller to control the fine actuator to move one of the coil supporter and the magnet supporter with respect to the other one. With this configuration, a transfer apparatus can perform a super-precision positioning control by decreasing a positioning control error.
Abstract:
Disclosed are a mask mold, a manufacturing method thereof, and a method for forming a large-sized micro pattern using the manufactured mask mold, in which the size of a nano-level micro pattern can be enlarged using a simple method with low cost and interference and stitching errors between cells forming a large area can be minimized. The method for manufacturing the mask mold includes the operations of coating resist on a mask or a plurality of small molds having an engraved micro pattern, pressing the small molds to imprint the micro pattern on the resist, curing the resist, and releasing the small molds from the resist.
Abstract:
A confocal scanning microscope using a Nipkow disk prevents deterioration of performance in an optical axis direction while maintaining a high measurement speed. The confocal scanning microscope includes a light source, an illuminating device to pass the light from the light source toward a certain direction, and two Nipkow disks each having slit-shaped apertures formed thereon such that the light incident from the illuminating device travels in a form of light which passed through a single aperture. In addition, the confocal scanning microscope includes a first optical system to form an image on a sample by the light passed through the Nipkow disks, and a second optical system to form a second image by the light reflected from the sample and passed through the Nipkow disks.
Abstract:
A measurement and compensation system for thermal errors in a machine tool is disclosed. A module is provided to compensate thermal errors of the machine tool. The module comprises an operating part, a data bank, an analog to digital converter, a counter and a digital input/output part. The data bank stores in all the coefficients applied to a thermal error modeling equation which governs a relation between temperatures and thermal errors at various operating conditions. The operating part determines all the coefficients of the thermal error modeling equation which are stored in the data bank and calculates the thermal errors corresponding to the temperatures of a plurality of the thermocouples by the temperatures of a plurality of thermocouples inputted from the A/D converter and the positional coordinates of the bed inputted from the counter. Then, digital data of the calculated thermal errors are inputted into the digital input/output part and the digital input/output part converts the digital data to digital signal to input the digital signals into the controller. A controller orders the machine tool to compensate the thermal errors at the positional coordinates of the bed and the feed of the spindle. Accordingly, since the machine tool compensates the thermal errors in advance, the machine tool processes precisely workpieces in spite of the occurrence of the thermal errors.
Abstract:
The present disclosure relates to an active diesel particulate filter (DPF) regeneration system of an engine, and more particularly, to an active DPF regeneration system and method, in which a non-work load is arbitrarily provided to the engine to quickly perform an active DPF regeneration even in a state where substantial work of a construction machine is stopped.
Abstract:
In forming a pattern on a substrate with reduced pattern error using a mold having an area smaller than an area of the substrate, a first resin pattern is formed on at least a first of a plurality of regions of an etching object layer by imprinting resin applied to the etching object layer using a first mold The etching object layer is then etched using the first resin pattern as an etching mask. A second resin pattern is formed on at least a second of the plurality of regions by imprinting resin applied to the etching object layer using a second mold. The etching object layer is again etched using the second resin pattern as an etching mask.
Abstract:
A method of manufacturing a printed circuit board including: preparing a first double-sided substrate including a first insulating layer, a first lower copper layer, a second circuit layer including a first lower land, and a first via; preparing a second double-sided substrate including a second insulating layer, a third lower copper layer, a fourth circuit layer including a second lower land, and a second via; disposing a third insulating layer between the second circuit layer and the fourth circuit layer such that the first lower land and the second lower land are electrically connected to each other though a conductive bump; and forming a first circuit layer including a first circuit pattern connected to the first via on the first lower copper layer and forming a third circuit layer including a third circuit pattern connected to the second via on the third lower copper layer.
Abstract:
Disclosed herein is a printed circuit board including an outmost fine circuit pattern. In the board, an end of a via, which has the minimum diameter, is connected to the outmost circuit layer of a substrate. The end surface, having the minimum diameter, is positioned at the outmost layer, so that the outmost circuit layer of the substrate, which needs to have a relatively high density in order to mount chips, compared to other circuit layers, can be more finely formed.
Abstract:
A method of transmitting multimedia data on demand by using a dynamic channel and apparatus thereof are disclosed. In one embodiment, the method includes i) continuously transmitting the multimedia data from beginning to end via a first static channel at a first static channel transmission point, ii) transmitting a portion of the multimedia data from beginning via a first to dth (d is a natural number not less than 1) dynamic channel at a first to dth dynamic channel transmission point and iii) reusing kth (k is more than 1 and less than d) dynamic channel as another dynamic channel after releasing the kth dynamic channel to be available after Tk from the kth dynamic channel transmission point, wherein the Tk is not less than an elapsed time from the first static channel transmission point to the kth dynamic channel transmission point