Abstract: An air purifier includes a main body having an inlet configured to receive air and a discharger configured to discharge the air. The air purifier also includes a filter disposed within the main body and configure to purify contaminates from the air. The air purifier also includes a contamination sensor disposed adjacent to the filter and integrally includes a light emitter configured to emit a light toward the filter and a light receiver configured to receive the light emitted from the light emitter.

Abstract: A microwave oven includes a tray rotatably installed inside a cooking compartment, a temperature measuring apparatus comprising a driving unit configured to generate a rotation force, and a sensing unit configured to measure the temperatures of a plurality of temperature measurement points by having a temperature measurement angle changed by the rotation force of the driving unit; and a control unit configured to control the temperature measuring apparatus to measure the plurality of temperature measurement points provided at the upper side of the tray according to a predetermined temperature measurement pattern that provides a different pattern for successive rotation periods of the tray.

Abstract: A cooking apparatus includes: a main body; a cooking table; an induction coil configured to emit a magnetic field needed for induction heating of a cooking container; and a temperature measurement unit disposed in an electronic component chamber formed in the main body so as to measure a temperature of the cooking container. The temperature measurement unit includes: a case having an opening formed at a top surface thereof; a temperature sensor disposed in the case so as to measure a temperature of the cooking container; and a cooling duct, one side of which is coupled to the case and the other side of which includes an air inlet therein. The temperature measurement unit is configured to adjust an internal temperature of the case when air introduced from the air inlet moves to the case through the cooling duct.

Abstract: An air purifier includes a main body comprising an inlet configured to receive air and a discharger configured to discharge the air. The air purifier also includes a filter disposed within the main body and configure to purify contaminates from the air. The air purifier also includes a contamination sensor disposed adjacent to the filter and integrally includes a light emitter configured to emit a light toward the filter and a light receiver configured to receive the light emitted from the light emitter.

Abstract: A microwave oven includes a tray rotatably installed inside a cooking compartment, a temperature measuring apparatus comprising a driving unit configured to generate a rotation force, and a sensing unit configured to measure the temperatures of a plurality of temperature measurement points by having a temperature measurement angle changed by the rotation force of the driving unit; and a control unit configured to control the temperature measuring apparatus to measure the plurality of temperature measurement points provided at the upper side of the tray according to a predetermined temperature measurement pattern that provides a different pattern for successive rotation periods of the tray.

Abstract: A washing machine that senses whether a door is opened or closed, vibration of a washing tub or weight of the washing tub. The washing machine includes an optical sensor mounted at a predetermined position in the washing machine and a controller to analyze an output value of the optical sensor to determine whether a door is opened or closed, vibration of a washing tub or weight of the washing tub. Whether the door is opened or closed, vibration of the washing tub or weight of the washing tub may be determined using a single infrared sensor in a noncontact manner.

Abstract: A refrigerator, the temperature of the inside of which is uniformly controlled, and a control method thereof. The direction of an air flow in a storage chamber is periodically changed so as to uniformly distribute cool air in the storage chamber by interchanging roles of suction and discharge holes in various manners under various conditions, thereby preventing local supercooling and thus uniformly maintaining the internal temperature of the storage chamber.