Abstract: Disclosed is power supply device and method having a spark prevention function. The power supply device having a spark prevention function includes output connectors to which an external device is coupled to be supplied with electric power; and an output controller for controlling a level of a voltage outputted to the output connectors depending upon whether the external device is coupled to the output connectors. Accordingly, damages to parts and malfunctions due to spark occurrences can be prevented, so an external device can be coupled to a power supply device in operation without any damage.

Abstract: A wall-mounted type microwave oven includes a cabinet and a hood having a guide duct. The guide duct is movably arranged in the hood, and automatically slides in and out the hood by an actuating unit of the microwave oven. A movable filter is set in the guide duct so as to be spaced apart from an inner surface of the guide duct by a predetermined interval. Where the guide duct is moved forward, exhaust gases generated therebelow pass through the movable filter, and the filtered gases are guided into the cabinet by the guide duct. The actuating unit includes a rotary member and a drive motor mounted on the hood. The rotary member is rotated by the drive motor to move the guide duct forward. The actuating unit further includes an elastic member which is connected, at an end thereof, to the hood and, at the other end thereof, to an inside end of the guide duct. The elastic member provides an elastic force to move the guide duct rearward.

Abstract: An apparatus for fixing a bobbin to a printed circuit board for use in a transformer includes a receiving hole formed in the printed circuit board, a size of which is minutely larger than that of the bobbin to hold the bobbin, and a horizontal support portion formed at the pins of the bobbin in parallel relation to an upper surface of the printed circuit board, for allowing the bobbin to be supported on the upper surface of the printed circuit board when the bobbin is inserted into the receiving hole. Accordingly, the apparatus for fixing the bobbin to the printed circuit board for use in the transformer can make the installation height of the transformer installed on the printed circuit board slim, thereby decreasing a thickness of the electronic product employing the transformer 10 and thus improving convenience in use.

Abstract: A method and device for searching a recording medium are provided. The recording medium has a management information area of which location information is overlapped with that of a program area. The method for determining an area on a recording medium having an overlapped time range between two areas reads a time address from a current position on the recording medium, obtains additional information from the recording medium or from a recording medium driving unit, if the read time address belongs to the overlapped range, and determines, based on the obtained additional information, to which one the areas the current position belongs. Therefore, the present invention prevents wrong track jumps that are caused from time-overlapped areas on a capacity-expanded recording medium.

Abstract: A power supply circuit for a video display device including a power transformer for inducing a voltage with respect to an input voltage by using an interaction occurring between a primary coil and a secondary coil; a switching circuit unit for controlling the voltage to be induced at the secondary coil of the power transformer by switching on/off a current flowing along the primary coil of the power transformer; first and second TVS diodes serially connected to each other; first and second resistors parallel connected to the respective first and second TVS diodes; a capacitor parallel connected to both ends of the first and second TVS diodes connected to each other and being charged with the transient voltage in the reverse direction that is supplied through the primary coil of the power transformer; and a diode for forming a passage of current in one direction when the capacitor is charged.

Abstract: A method for forming a resin molding on a coil of a transformer is disclosed. The method comprises the steps of inserting a coil into an auxiliary spacing apparatus, inserting the auxiliary spacing apparatus into a mold, and forming a resin molding for the auxiliary spacing apparatus with the coil by putting a resin into the mold. According to the methods, the coil is not damaged and a resin molding is formed with a uniform thickness.

Abstract: A white light source using carbon nanotubes and a fabrication method thereof are provided. The white light source includes a metal film which is formed on a lower substrate and used as a cathode, a catalytic metal film formed on the metal film, carbon nanotubes which are vertically aligned on the catalytic metal film for emission of electrons in an applied electric field, spacers mounted on the catalytic metal film, and a transparent upper substrate which has a transparent electrode for an anode and a fluorescent body on the transparent electrode, and which is mounted on the spacers such that the fluorescent body faces the carbon nanotubes. The catalytic metal film is composed of isolated nano-sized catalytic metal particles. The carbon nanotubes are grown from each of the catalytic metal particles to be vertically aligned on the substrate by chemical vapor deposition.

Abstract: The present invention relates to a method of detecting a defect area without any mistake during data recording on a writable disk. This method detects a level of a servo error signal produced during a recording operation, checks whether the servo error signal is in an abnormal state based on the detected level, detects a periodic wobble signal or periodicity of the abnormal state occurrences of the servo error signal produced during the recording operation, and determines whether a recording area is in defect based on successful decoding of the detected periodic wobble signal or the periodicity of the abnormal state occurrences if the servo error signal is in an abnormal state. This method ensures exact detection of a defect area, whereby unnecessary speed reduction can be eliminated and successful data writing can be also guaranteed even in a defect area.

Abstract: A method for forming a resin molding on a coil of a transformer is disclosed. The method comprises the steps of inserting a coil into an auxiliary spacing apparatus, inserting the auxiliary spacing apparatus into a mold, and forming a resin molding for the auxiliary spacing apparatus with the coil by putting a resin into the mold. According to the methods, the coil is not damaged and a resin molding is formed with an uniform thickness.

Abstract: A high voltage transformer for a microwave oven includes a core, and primary and secondary coils. An insulation molding part encloses at least a part of the secondary coil and has a sensor accommodation portion formed therein. A temperature sensor is accommodated in the sensor accommodating portion for detecting temperature of the secondary coil. The sensor accommodating portion can be formed inside of the insulation molding part together with the temperature sensor, or formed outside of the insulation molding part in a pocket shape. With either configuration, the temperature sensor can be positioned at the correct sensor position, thereby improving the detecting accuracy of the temperature sensor. In addition, it is easy to repair and/or replace the temperature sensor.

Abstract: This invention provides a method and apparatus for automatic type discrimination of differently sized disk-shaped information storage media, wherein pulses in a signal generated during the initial rotation and the associated elapsed time are counted and used to detect the size of the disk-shaped information storage medium. The method according to this invention comprises the steps of detecting signals produced from a driving unit for rotating a disk-shaped information storage medium; and identifying the type of the disk-shaped information storage medium according to the size thereof on the basis of comparison of the detected signal with a reference signal. This invention enables to detect the size of the disk-shaped information storage medium in a shorter period time compared to the conventional art because the initial time duration needed to get a desired stable rotation speed, which depends on the size of the disk-shaped information storage medium, is no longer required.

Abstract: A transformer for a microwave oven capable of preventing quality deterioration thereof due to damaged insulating paper, includes a first core having a coil inserting section having one open side; a plurality of coils sequentially inserted into the coil inserting section in an inter-electrically insulated state; a second core coupled,to the first core, and for covering the open side of the coil inserting section; and a resin molding section formed to cover the whole area of the plurality of coils.

Abstract: This invention provides a system and method for detecting misfires of an engine that reduces on board computer memory loss and shortens the time to process routines to detect misfires. Teeth are installed in a flywheel connected to a crank shaft, and analog signals that are generated by a difference between a tooth and a bottom of a tooth space are detected by a magnetic pickup. The analog signals are transformed into digital signals by a digital circuit, and the number of HIGH values of the digital signals and time between the top dead centers (TDCs) are detected by a timer and counter. An angular acceleration of the flywheel is then found by an electric control unit (ECU). A magnitude of frequency components of the angular acceleration is found performing a discrete Fourier transform (DFT) on the angular acceleration with respect to a Walsh function as a basis function, and the magnitude of the frequency components are compared with a predetermined reference value to detect a misfire of the engine.

Abstract: A method of synthesizing high purity carbon nanotubes vertically aligned over a large size substrate by thermal chemical vapor deposition (CVD). In the synthesis method, isolated nano-sized catalytic metal particles are formed over a substrate by etching, and purified carbon nanotubes are grown vertically aligned, from the catalytic metal particles by thermal CVD using a carbon source gas.

Abstract: The present invention relates to a method of changing a recording mode from CAV (Constant Angular Velocity) to CLV (Constant Linear Velocity) mode in the middle of recording data to a disk recording medium. A method according to the present invention reads ATIP-framed data encoded in a wobble signal formed along a spiral physical track while recording input data to a recording medium, detects a sync signal contained in the read ATIP-framed data. Another method measures frequency of a low-frequency component of the wobble signal instead of reading ATIP-framed data. These two methods determines, in common, when to change the recording mode from CAV to CLV based on the period of the detected sync signal or the measured frequency. The present invention makes it possible to record input data to an entire area of a disk more rapidly without fatal errors such as imperfect writing. As a result, total recording time can be reduced with stable recording guaranteed.

Abstract: A method for forming a resin molding on a coil of a transformer is disclosed. The method comprises the steps of inserting a coil into an auxiliary spacing apparatus, inserting the auxiliary spacing apparatus into a mold, and forming a resin molding for the auxiliary spacing apparatus with the coil by putting a resin into the mold. According to the methods, the coil is not damaged and a resin molding is formed with an uniform thickness.

Abstract: A power saving circuit of an AC/DC adaptor for a portable computer including an input until converting an AC voltage into a DC voltage; a power transistor; a transformer inputting the DC voltage and inducing an AC voltage based on the state of the power transistor; an output unit converting the AC voltage into a DC voltage; a feedback unit producing a feedback voltage based on an output voltage of the output unit; a driver outputting a PWM control signal to the power transistor based on the feedback voltage; an output load sensor outputting a sensing signal if a sensed load of the output unit is below a predetermined level; an output voltage dropping unit dropping an output voltage of the output unit based on the sensed signal; and a switching frequency reducer reducing a switching frequency of the PWM control signal based on the sensing signal.

Abstract: A thermal chemical vapor deposition apparatus and method of synthesizing carbon nanotubes using the same are provided. The apparatus includes a conveyer conveyer belt for sequentially receiving and conveying a plurality of substrates, a rotating unit for conveying the conveyer belt, a loading unit for sequentially loading the substrates onto the conveyer belt, an unloading unit installed to face the loading unit for unloading the substrates conveyed by the conveyer belt, a reactive gas supplying unit for supplying a reactive gas for synthesizing carbon nanotubes onto the substrates conveyed by the conveyer belt, a substrate heating unit for heating the substrates loaded on the conveyer belt, for thermal reaction of the reactive gas, and an exhausting unit for exhausting a reaction product gas.

Abstract: In the microwave oven having a high voltage driving part with a high voltage transformer, a switching unit applies electric power to the high voltage driving part. In the switching unit, when switched on, an operational contact firstly comes in contact with a first contact coupled with a PTC thermistor and secondly with a second contact after a given time period, and a driving unit generates driving force and turns on/off the switching unit. Since the switching unit and driving unit may be simply installed to effectively eliminate the inrush current, assembly and work efficiencies are improved according to a simpler wiring process, and also, the total manufacturing cost for the microwave oven is reduced.