Abstract: Provided herein is a cooking apparatus. The cooking apparatus includes a plate forming a cavity, a microwave transmission line to transmit microwaves to the inside of the cavity, and a first metal part connected to one end of the microwave transmission line and extended in one direction so as to be parallel with the plate. Thereby, an antenna having improved efficiency is provided.

Abstract: Provided herein is a cooking apparatus. The cooking apparatus includes a plate forming a cavity, a microwave transmission line to transmit microwaves to the inside of the cavity, and a first metal part connected to one end of the microwave transmission line and extended in one direction so as to be parallel with the plate. Thereby, an antenna having improved efficiency is provided.

Abstract: Provided herein are a cooking apparatus and an operating method thereof. The cooking apparatus includes a microwave generator to generate and output microwaves of a plurality of frequencies to heat an object within a cavity, a resonance mode conversion unit to convert a resonance mode by varying at least one of progressing direction, power or frequency of the microwaves output to the inside of the cavity, and a controller to operate the resonance mode conversion unit, if the number of frequencies of microwaves, the heating efficiencies of which are more than a reference heating efficiency, is below a reference value, based on heating efficiencies calculated according to microwaves reflected by the inside of the cavity from among the output microwaves. Thereby, operating efficiency of the cooking apparatus is improved.

Abstract: Provided are a cooker and a method for controlling the same. The cooker includes a cooking chamber in which a food is cooked and a heating source providing heat for cooking the food within the cooking chamber. The heating source maintains a temperature of the cooking chamber at a preset first set temperature, and then maintains a preset second set temperature at a temperature exceeding the first set temperature.

Abstract: An electrodeless lighting system comprises: a first case in which a microwave generator, a waveguide for guiding microwave energy and a luminous part communicating with the waveguide, for emitting light by the microwave energy are installed, wherein one side of the first case is opened so that light from the luminous part is emitted to the outside; a second case coupled to the first case to open or close the opened one side of the first case and configured to pass the light from the luminous part; and a third case positioned at one outer side of the first case, in which a high voltage generator for supplying a high voltage to the microwave generator is installed. Accordingly, in the electrodeless lighting system, lateral lighting can be made like a streetlight, heat generating components and lighting components can be installed at separated spaces, respectively, and the generated heat can be smoothly emitted to the outside.

Abstract: A bulb structure of an electrodeless lighting system comprises: a bulb body having an interior space receiving a luminous material emitting light by microwave energy; a bulb support portion integrally extending from one side of the bulb body to communicate with the bulb body, supporting the bulb body, connected to a bulb rotating motor at its one end, and having therein a passage through which the luminous material is injected; and a covering portion formed at an inner communicating portion where the bulb body communicates with the bulb support portion so as to hermetically seal the bulb body, thereby improving light distribution characteristics of the electrodeless lighting system.

Abstract: An electrodeless lighting apparatus includes: a waveguide for guiding microwave energy generated from a microwave generator; a resonance unit coupled with an outlet of the waveguide and comprising at least two resonators having mesh structures which are slidingly coupled with each other in the longitudinal direction such that the height of the resonance unit is varied and an aperture ratio according to the height of the resonance unit is varied, the resonance unit for resonating the microwave energy guided through the waveguide; and a bulb located inside the resonance unit and generating light as a material enclosed therein becomes plasma by microwave energy, so that the overall length of the resonance unit can be varied or aperture ratios of the mesh corresponding to the height of the resonance unit can be adjusted according to a bulb type and conditions to which the electrodeless lighting apparatus is applied, whereby a resonator does not need to be separately manufactured according to its length or apertur

Abstract: An electrodeless lighting system includes a resonator which passes light. The resonator communicates with a waveguide which guides microwave energy generated by a microwave generator. The microwave energy forms an electric field in the resonator. The electrodeless lighting system further includes a bulb, positioned in the resonator, that generates light from the electric field, a first coil which is wound around an outer circumferential surface of the resonator, and a second coil which is wound around the outer circumferential surface of the resonator. The bulb is disposed between the first coil and the second coil, with the first coil and the second coil forming a magnetic field around the bulb. Accordingly, initial lighting can be more easily achieved, and if the intensity of the magnetic field is properly controlled, the total quantity of light is increased, thereby improving luminous efficiency of the bulb.

Abstract: An electrodeless lighting system includes: a waveguide for guiding microwave energy generated from a microwave generator; and a resonator formed in a mesh structure allowing the microwave energy having passed the waveguide to resonate therein and passing light, and having around the bulb a microwave leakage preventing portion having a relatively low perforation ratio per unit area so that microwave energy is concentrated on the bulb positioned therein. Accordingly, leakage of microwaves is minimized and luminous efficiency is improved.

Abstract: An electrodeless lighting apparatus includes: a waveguide for guiding microwave energy generated from a microwave generator; a resonance unit coupled with an outlet of the waveguide and comprising at least two resonators having mesh structures which are slidingly coupled with each other in the longitudinal direction such that the height of the resonance unit is varied and an aperture ratio according to the height of the resonance unit is varied, the resonance unit for resonating the microwave energy guided through the waveguide; and a bulb located inside the resonance unit and generating light as a material enclosed therein becomes plasma by microwave energy, so that the overall length of the resonance unit can be varied or aperture ratios of the mesh corresponding to the height of the resonance unit can be adjusted according to a bulb type and conditions to which the electrodeless lighting apparatus is applied, whereby a resonator does not need to be separately manufactured according to its length or apertur

Abstract: An electrodeless lighting system comprises: a first case in which a microwave generator, a waveguide for guiding microwave energy and a luminous part communicating with the waveguide, for emitting light by the microwave energy are installed, wherein one side of the first case is opened so that light from the luminous part is emitted to the outside; a second case coupled to the first case to open or close the opened one side of the first case and configured to pass the light from the luminous part; and a third case positioned at one outer side of the first case, in which a high voltage generator for supplying a high voltage to the microwave generator is installed. Accordingly, in the electrodeless lighting system, lateral lighting can be made like a streetlight, heat generating components and lighting components can be installed at separated spaces, respectively, and the generated heat can be smoothly emitted to the outside.

Abstract: Disclosed is a bulb of an electrodeless lighting system, comprising: a resonator communicated with a waveguide which guides microwave energy generated in a microwave generator, for allowing light to pass therethrough and resonating the microwave energy therein; and a bulb placed in the resonator, for emitting light by exciting a light emitting material therein depending on the microwave energy, wherein the light emitting material is composed of a sulfur and an additive combined with the sulfur for varying a correlated color temperature during emission, thereby capable of varying the correlated color temperature of the light emitted from the bulb up to 6000K˜2500K with a high efficiency.

Abstract: A bulb structure of an electrodeless lighting system comprises: a bulb body having an interior space receiving a luminous material emitting light by microwave energy; a bulb support portion integrally extending from one side of the bulb body to communicate with the bulb body, supporting the bulb body, connected to a bulb rotating motor at its one end, and having therein a passage through which the luminous material is injected; and a covering portion formed at an inner communicating portion where the bulb body communicates with the bulb support portion so as to hermetically seal the bulb body, thereby improving light distribution characteristics of the electrodeless lighting system.

Abstract: An electrodeless lighting system comprises: a resonator communicating with a waveguide for guiding microwave energy generated at a microwave generator, the resonator passing light, in which an electric field is formed by microwave energy; a bulb positioned in the resonator, for generating light by microwave energy by the electric field; and a magnetic field applying means installed around the resonator to improve luminous efficiency of the bulb, for forming a magnetic field around the bulb. Accordingly, initial lighting can be more easily achieved, and if the intensity of the magnetic field is properly controlled, the total quantity of light is increased, thereby improving luminous efficiency of the bulb.

Abstract: An electrodeless lighting system includes: a waveguide for guiding microwave energy generated from a microwave generator; and a resonator formed in a mesh structure allowing the microwave energy having passed the waveguide to resonate therein and passing light, and having around the bulb a microwave leakage preventing portion having a relatively low perforation ratio per unit area so that microwave energy is concentrated on the bulb positioned therein. Accordingly, leakage of microwaves is minimized and luminous efficiency is improved.