Abstract: A circuit board according to an embodiment includes a first insulating layer; a second insulating layer disposed on the first insulating layer and including a cavity; a pad disposed on the first insulating layer and having a top surface exposed through the cavity; wherein the cavity of the second insulating layer includes: a bottom surface positioned higher than the top surface of the first insulating layer; and an inner wall extending from the bottom surface, wherein the inner wall includes: a first inner wall extending from the bottom surface and having a first inclination angle; and a second inner wall extending from the first inner wall and having a second inclination angle different from the first inclination angle.

Abstract: A circuit board according to an embodiment includes a first insulating layer; a second insulating layer disposed on the first insulating layer and including a cavity; and a plurality of pads disposed on the first insulating layer and having top surfaces exposed through the cavity; wherein the cavity of the second insulating layer includes: a bottom surface positioned higher than a top surface of the first insulating layer; and an inner wall extending from the bottom surface, wherein the inner wall is perpendicular to top or bottom surface of the second insulating layer, wherein the bottom surface of the cavity includes: a first bottom surface positioned lower than a top surface of the pad and positioned outside an arrangement region of the plurality of pads; and a second bottom surface positioned lower than the top surface of the pad and positioned inside the arrangement region of the plurality of pads, and wherein a height of the first bottom surface is different from a height of the second bottom surface.

Abstract: An inductor includes a first magnetic body having a toroidal shape and having a ferrite; and a second magnetic body configured to be different from the first magnetic body and including a metal ribbon, wherein the second magnetic body includes an outer magnetic body disposed on an outer circumferential surface of the first magnetic body and an inner magnetic body disposed on an inner circumferential surface of the first magnetic body, and each of the outer magnetic body and inner magnetic body is wound in a plurality of layers in a circumferential direction of the first magnetic body.

Abstract: Disclosed herein is an earphone module having a speaker capable of reproducing both high- and low-pitched sounds. In an earphone module according to the present invention, two coils and terminal members configured to be electrically connected to the two coils are provided, the two coils and the terminal members are assembled by electrically connecting the two coils and the terminal members to each other, and then the terminal members are connected to an external input circuit through the exposure window of a housing. Accordingly, the manufacturing operation is facilitated and the defect rate is reduced, so that the mass productivity is improved.

Abstract: The present invention relates to a design for optimally mounting a Touch Drive (IC) (TDI) signal line and a Display Drive IC (DDI) signal line of a display apparatus having a touch function. According to the display apparatus having a touch function and the method of mounting the signal line of the display apparatus according to the present invention, the TDI signal line and the DDI signal line are mounted so as not to overlap in the bending region on the same flexible substrate, thereby preventing the problem, such as cracks, in the related art. Further, according to the display apparatus having a touch function and the method of mounting the signal line of the display apparatus according to the present invention, it is possible to easily manufacture a full-screen display apparatus by reducing a length of a fan-out area of the TDI signal line.

Abstract: The present invention relates to a design for optimally mounting a Touch Drive (IC) (TDI) signal line and a Display Drive IC (DDI) signal line of a display apparatus having a touch function. According to the display apparatus having a touch function and the method of mounting the signal line of the display apparatus according to the present invention, the TDI signal line and the DDI signal line are mounted so as not to overlap in the bending region on the same flexible substrate, thereby preventing the problem, such as cracks, in the related art. Further, according to the display apparatus having a touch function and the method of mounting the signal line of the display apparatus according to the present invention, it is possible to easily manufacture a full-screen display apparatus by reducing a length of a fan-out area of the TDI signal line.

Abstract: Disclosed herein is a wireless earphone system. The wireless earphone system includes wireless earphones and a charging case. Each of the wireless earphones includes: a connection unit configured to electrically connect with a charging case; and an internal circuit unit configured to receive a mode switching signal, directing a voice output mode to be switched, applied from the charging case via the connection unit, and to output a sound signal, wirelessly received from an electronic device, to the charging case via the connection unit without outputting the sound signal to a corresponding speaker by itself.

Abstract: The present invention relates to a method for selectively etching a silicon oxide film in a semiconductor manufacturing process and comprises: a step of introducing a substrate having a silicon nitride film and a silicon oxide film to a substrate support part inside a reactor; a step of heating the substrate introduced into the reactor, so as to maintain a first temperature; a first step of supplying halogen gas and basic gas to the inside of the reactor, while the first temperature is maintained, so as to be reacted with the silicon oxide film formed on the substrate, thereby forming a reaction product on the substrate; a second step of heating the substrate, having the reaction product, up to a second temperature so as to remove the reaction product; a third step of cooling the temperature of the substrate down to the first temperature; and a step of repetitively performing the first step to the third step a preset number of times.

Abstract: Disclosed herein is a wireless earphone system. The wireless earphone system includes wireless earphones and a charging case. Each of the wireless earphones includes: a connection unit configured to electrically connect with a charging case; and an internal circuit unit configured to receive a mode switching signal, directing a voice output mode to be switched, applied from the charging case via the connection unit, and to output a sound signal, wirelessly received from an electronic device, to the charging case via the connection unit without outputting the sound signal to a corresponding speaker by itself.

Abstract: The present invention relates to a method for selectively etching a silicon oxide film in a semiconductor manufacturing process and comprises: a step of introducing a substrate having a silicon nitride film and a silicon oxide film to a substrate support part inside a reactor; a step of heating the substrate introduced into the reactor, so as to maintain a first temperature; a first step of supplying halogen gas and basic gas to the inside of the reactor, while the first temperature is maintained, so as to be reacted with the silicon oxide film formed on the substrate, thereby forming a reaction product on the substrate; a second step of heating the substrate, having the reaction product, up to a second temperature so as to remove the reaction product; a third step of cooling the temperature of the substrate down to the first temperature; and a step of repetitively performing the first step to the third step a preset number of times.

Abstract: An earphone device is provided. The earphone device includes a pair of earphone modules. At least one of the earphone modules includes a microphone, a speaker, and a housing configured to accommodate the microphone and the speaker in an inner space thereof. The housing includes a path hole to allow the inner space to communicate outside of the housing to facilitate sound outside of the housing to enter the microphone or sound generated by the speaker to travel outside of the housing, and a partition element to partition the path hole of the housing into a first passageway and a second passageway, the first and second passageways being isolated from each other. The microphone or the speaker is housed inside the partition element. The speaker is spaced apart from the microphone at a predetermined interval and arranged to be side by side with the microphone.

Abstract: The present invention includes: a connecting plug configured to be connected to the quadripolar input/output interface of a portable terminal, and to transmit or receive output or input signals; and a function unit configured to be supplied with operating power from the portable terminal via the connecting plug, and to perform an intrinsic function; wherein the connecting plug includes a first pole configured to come into contact with the first output terminal of the portable terminal; a second pole configured to come into contact with the second output terminal of the portable terminal; a third pole configured to come into contact with the microphone terminal of the portable terminal; and a fourth pole configured to come into contact with the ground terminal of the portable terminal; and wherein the function unit is supplied with operating power via any one of the first pole, the second pole, and the third pole.

Abstract: The wind generator includes a support part, a housing connected to an upper portion of the support part, the housing having an inner space, a blade part connected to one side of the housing, the blade part, an electricity generating part seated in the inner space of the housing, a flywheel, and a tail part. The flywheel includes a shaft rotating together with the blade part, a rotor coupled to the shaft, the rotor including at least one permanent magnet along an outer circumferential surface thereof, at least one coil part disposed outside in a radial direction of the rotor and around which a trigger coil is wound, the at least one coil generating magnetic fields when current is supplied to the trigger coil, and a circuit part supplying pulse-type current to trigger coil when the permanent magnet passes through a center of the trigger coil.

Abstract: A flywheel includes a shaft a rotor attached to the shaft. The rotor rotates using the shaft as a central axis. The rotor includes at least one magnet along an outer circumferential surface thereof, at least one coil spaced apart from the rotor in a radial direction. The coil may form a magnetic field that exerts a magnetic force on the magnets when current is supplied to the coil by an electric circuit, thus mitigating fluctuations in rotation of the rotor.

Abstract: An inverse transform method and apparatus for a video codec are disclosed. The inverse transformer can include: a first inverse transform unit configured to perform an inverse transform operation on an even column portion of a 2n×2n block or an n×n block sharing inverse transform coefficients; and a second inverse transform unit configured to store coefficients according to a first input mode and a second input mode and configured to select coefficients according to input mode and multiply the selected coefficients with an input value to perform an inverse transform of an odd column portion of a 2n×2n block or an n×n block.

Abstract: A data cable for fast charging comprises: a cable for transmitting data and charging; a first connection unit which is disposed on one end of the cable so as to be connected to a power source; a second connection unit which is disposed on the other end of the cable so as to be connected to a mobile terminal; and a mode switching circuit which enables mode switching between a data transmission mode and a fast charging mode, wherein the mode switching circuit comprises: a terminal switching logic which applies an input voltage of the first connection unit; divided resistances; a switch for the mode switching between the data transmission mode and the fast charging mode; and an analog switching logic which responds to the switch for the mode switching.

Abstract: The wind generator includes a support part, a housing connected to an upper portion of the support part, the housing having an inner space, a blade part connected to one side of the housing, the blade part, an electricity generating part seated in the inner space of the housing, a flywheel, and a tail part. The flywheel includes a shaft rotating together with the blade part, a rotor coupled to the shaft, the rotor including at least one permanent magnet along an outer circumferential surface thereof, at least one coil part disposed outside in a radial direction of the rotor and around which a trigger coil is wound, the at least one coil generating magnetic fields when current is supplied to the trigger coil, and a circuit part supplying pulse-type current to trigger coil when the permanent magnet passes through a center of the trigger coil.

Abstract: A flywheel includes a shaft a rotor attached to the shaft. The rotor rotates using the shaft as a central axis. The rotor includes at least one magnet along an outer circumferential surface thereof, at least one coil spaced apart from the rotor in a radial direction. The coil may form a magnetic field that exerts a magnetic force on the magnets when current is supplied to the coil by an electric circuit, thus mitigating fluctuations in rotation of the rotor.

Abstract: Earphones are provided. A microphone and a speaker are arranged side by side with respect to the direction facing a user's earhole, and a passageway through which a sound moves between the microphone and the outside and a passageway through which a sound moves between the speaker and the outside are divided to be blocked from each other. The earphones can provide good productivity and enhance reliability of products by reducing a defect rate.