Abstract: An electronic device including a memory device with improved reliability is provided. The semiconductor device comprises a data pin configured to transmit a data signal, a command/address pin configured to transmit a command and an address, a command/address receiver connected to the command/address pin, and a computing unit connected to the command/address receiver, wherein the command/address receiver receives a first command and a first address from the outside through the command/address pin and generates a first instruction on the basis of the first command and the first address, and the computing unit receives the first instruction and performs computation based on the first instruction.

Abstract: A welding mask including a mask body for covering an entire face of a wearer having an opening portion corresponding to eyes of the wearer thereof; a rotatable cover rotationally coupled to a front of the mask body upward and downward; a shading filter mounted on the rotatable cover so as to shade a light generated during welding operation thereof; an elastic coupling means for rotationally coupling the rotatable cover to both side surfaces of the mask body upward; and a fixing means for fixing the rotatable cover or releasing a fixing status thereof formed at one side of the mask body. In addition, a window is further formed at the rear portion of the rotatable cover having the shading filter, thereby improving operation efficiency.

Abstract: Disclosed is a shading device for a welding helmet in which a circuit portion (the second frame) having a high error rate and the remaining portion can be separated from each other and only the circuit portion separated from the device can be repaired or changed, thereby the maintenance and repair are harmoniously. The shading device for a welding helmet comprising a first frame comprises a first body having a LCD module with contacting portions formed at both sides of a LCD window and a first joint portion formed at one end portion of the first body, a second frame comprising a second body 32 having a power supplying portion and a second joint portion attachable and deattachable to the first joint portion of the first frame at one end portion thereof, a pair of electrodes having one side thereof electrically contacted with the contacting portions respectively, and an electrically conductive means for electrically connecting the power supplying portion with the corresponded electrodes.

Abstract: Disclosed is a welding mask including a mask body for covering an entire face of a wearer having an opening portion corresponding to eyes of the wearer thereof; a rotatable cover rotationally coupled to a front of the mask body upward and downward; a shading filter mounted on the rotatable cover so as to shade a light generated during welding operation thereof; an elastic coupling means for rotationally coupling the rotatable cover to both side surfaces of the mask body upward; and a fixing means for fixing the rotatable cover or releasing a fixing status thereof formed at one side of the mask body. Also, a window is further formed at the rear portion of the rotatable cover having the shading filter, thereby improving operation efficiency.