| Kumho Electric, Inc. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110291142 | OXYNITRIDE PHOSPHOR, METHOD FOR PREPARING THE SAME, AND LIGHT-EMITTING DEVICE - The present invention relates to an oxynitride phosphor, a method for preparing the same, and a light-emitting device. More specifically, the present invention provides the oxynitride phosphor including crystals represented by the following Chemical Formula, a method for preparing the same, and a light-emitting device including the oxynitride phosphor. The invention includes the crystals' represented by the following Chemical Formula to obtain high light-emitting efficiency. [Chemical Formula] (A | 12-01-2011 |
| 20110121724 | FILAMENT FOR FLUORESCENT LAMP - The present invention relates to a filament for a fluorescent lamp, having a structure that can increase an amount of emitter applied thereto, and having optimized cold resistance (Rc) and a heat resistance (Rh) which capable of recognizing appropriate temperature thereof by which evaporation or scattering of the emitter can be decreased and maintaining a temperature thereof within an appropriate range, thereby reducing a loss rate of the emitter applied to the filament to increase the lifespan of the fluorescent lamp. The filament includes an inner coil wound in a spiral shape in one direction, a core wire wound in a spiral shape to surround the inner coil in a longitudinal direction of the inner coil, and an outer coil wound in a spiral shape to surround the core wire and surrounding the inner coil together with the core wire and characterized in that a ratio (Rh/Rc) between a heat resistance Rh and a cold resistance Rc of the filament is 4.8 to 6.2. | 05-26-2011 |
| 20110037400 | Constant Current Driving Circuit for Field Emission Device - A constant current driving circuit for a field emission device has a ground current of an anode electrode measured in real time and the measured ground current is fedback to vary the frequency and duty ratio of a voltage applied to gate and cathode electrodes of the field emission device, thereby causing the ground current of the anode electrode to be constantly maintained. The field emission device has an anode electrode formed on a front substrate, gate and cathode electrodes formed on a rear substrate disposed opposite to the front substrate to be spaced apart from the front substrate by a predetermined distance, and an emitter formed on a top surface of the cathode electrode. The constant current driving circuit includes current detection circuit for detecting a ground current of the anode electrode; an input power unit for applying a driving AC voltage for emitting electrons from the emitter to the gate and cathode electrodes; and a feedback circuit unit for comparing the ground current of the anode electrode detected by the current detection circuit with a predetermined reference voltage to obtain a current variation and providing the input power unit with a frequency signal for varying a frequency of the driving AC voltage or a duty ratio signal for varying a duty ratio of the driving AC voltage in accordance with the current variation. | 02-17-2011 |
| 20100194296 | LED FLUORESCENT LAMP - Provided is a light-emitting diode (LED) fluorescent lamp using as light sources a plurality of LEDs, which are eco-friendly and can contribute to power conservation. The LED fluorescent lamp includes an LED array including a plurality of LEDs connected in series; first through fourth connection pins; first through fourth capacitors connected to the first through fourth connection pins, respectively; a first diode having an anode connected to a second end of the first capacitor and a cathode connected to a first end of the LED array; a second diode having an anode connected to a second end of the LED array and a cathode connected to a second end of the second capacitor; a third diode having an anode connected to the second end of the LED array and a cathode connected to a second end of the third capacitor; and a fourth diode having an anode connected to a second end of the fourth capacitor and a cathode connected commonly to the first end of the LED array and the cathode of the first diode. The LED fluorescent lamp can be readily used in various types of fluorescent lamp ballasts without a requirement of the installation of additional equipment or the change of wiring. | 08-05-2010 |
| 20100096976 | LED FLUORESCENT LAMP - A light-emitting diode (LED) fluorescent lamp which can replace a typical fluorescent lamp is provided. The LED fluorescent lamp includes an LED array including a plurality of LEDs connected in series; first through fourth connection pins; first through fourth capacitors connected to the first through fourth connection pins, respectively; a first diode having an commonly connected to second ends of the first and third capacitors and a cathode connected to a first end of the LED array; a second diode having an anode connected to a second end of the LED array and a cathode commonly connected to second ends of the second and fourth capacitors. The LED fluorescent lamp can replace a typical fluorescent lamp without a requirement of the installation of additional equipment or the change of wiring. | 04-22-2010 |
| 20090303700 | AQUATIC LIGHT EMITTING DEVICE - An aquatic light emitting device comprising a plurality of point light emitting units and a plurality of linear light emitting units is disclosed. The point light emitting unit comprises a floating member part, a light source part, and a power supply part. The floating member includes a hollow body which has an internal space isolated from the outside so as to give buoyancy, one or more junction portions formed on an outer surface thereof, and has a light inlet opening formed on an upper part, and a string connected to a lower surface of the hollow body. The light source part is attached to the upper surface of the floating member, has an isolated internal space with light outlet openings provided at the upper and lower surfaces thereof, and a light source and a light source control circuit contained in the isolated internal space. The power supply part is located on the upper surface of the light source part and includes a solar cell. The linear light emitting unit comprises at least one optical fiber which is introduced into the hollow body through a hole formed at the junction portion, one end of which is arranged at the light inlet opening of the hollow body, and part of which extends outwards through the junction portion, and is surrounded by a transparent tube. | 12-10-2009 |
| 20090003013 | OVERSPEED PREVENTION STRUCTURE USING PLASTIC OPTICAL FIBER - An overspeed prevention structure is disclosed herein. The overspeed prevention structure according to the present invention comprises a structural body having a curved convex upper surface; an external light source; and a plastic optical fiber embedded in the structural body and connected electrically to the external light source so as to emit the light outside the structural body. | 01-01-2009 |
