Abstract:
A power control device and an image forming apparatus including the same are disclosed. A power control device meets the need for low power consumption by minimizing standby power consumption in a plug-on state of an electronic apparatus, and meets the safety requirements by increasing a discharging rate of an X-cap or an E-cap in a plug-off state. The power control device includes a first capacitor charged by AC power during input of the AC power, a rectifier converting the AC power to DC power, a second capacitor disposed at an output of the rectifier, and a discharge circuit including at least one discharge resistor, and a first switch and a second switch configured to be alternately turned on/off in response to supply and interruption of the AC power, and discharging at least one of the first and second capacitors via the at least one discharge resistor, in response to turn-off of the first switch and turn-on of the second switch.
Abstract:
A light emitting module is provided including a light emitting device and a reflective member disposed on the light emitting device. The reflective member includes a hole with an inner wall thereof provided as a reflective surface, having a lower aperture having a quadrangular shape and an upper aperture having a shape geometrically different from that of the lower aperture. The inner wall includes first to fourth inclined surfaces extending from respective sides of the lower aperture to the upper aperture, and first to fourth connection surfaces extending from a respective vertex of the lower aperture to the upper aperture to connect the inclined surfaces to each other. The illuminance distribution of emitted light has a quadrangular shape. Accordingly, a relatively high degree of design freedom may be secured for a reflective member while maintaining required illuminance distribution characteristics.
Abstract:
An LED lens includes a recess disposed in a quadrangular bottom surface of the LED lens and configured to have a light source disposed therein, wherein an internal surface of the recess, including lateral surfaces and top surfaces, is a light incident surface. The LED lens further includes a top surface forming a light exit surface, having a size greater than that of the bottom surface, and having a quadrangular shape; and lateral surfaces of the LED lens, disposed between the top and bottom surfaces of the LED lens, forming a reflective surface, and guiding light incident to the LED lens through the light incident surface to the light exit surface. The top surfaces of the light incident surface form an inverted quadrangular pyramid.
Abstract:
In example embodiments, a semiconductor light emitting device includes a light emitting structure, first and second insulating layers, a barrier metal layer, and an electrode. The light emitting structure includes an active layer between a first and second conductivity-type semiconductor layer. The first insulating layer is on the light emitting structure and defines a first one and a second one of first openings that respectively expose the first and second conductivity-type semiconductor layers. The barrier metal layer is on the first insulating layer and electrically connected to the first and second conductivity-type semiconductor layers through the first and second one of the first openings. The second insulating layer is on the barrier metal layer and defines a second opening that partially exposes the barrier metal layer. The electrode is on the barrier metal layer and electrically connected to the first and second conductivity-type semiconductor layers through the barrier metal layer.
Abstract:
A flash device for a camera includes a light source unit and a driving unit. The light source unit includes a plurality of light emitting devices, each of which is configured to output light of different colors. The driving unit is configured to drive a first light emitting device among the plurality of light emitting devices when the camera images a subject to obtain a first image, and drive a second light emitting device different from the first light emitting device among the plurality of light emitting devices when the camera images the subject to obtain a second image.
Abstract:
An interface unit that interrupts overcurrent or overvoltage resulting from a ground voltage difference between electronic products interconnected through interface devices, so as to prevent damage to the products and risk of fire. The interface unit, which connects a first electronic product and a second electronic product to each other, includes a first interface device provided in the first electronic product and connected with the second electronic product, a second interface device provided in the second electronic product and connected with the first interface device through a VCC line and a ground line, and a ground overcurrent interrupter installed on the ground line, the ground overcurrent interrupter interrupting overcurrent flowing in the ground line.
Abstract:
A semiconductor light emitting device may include a semiconductor light emitting diode (LED) chip, a light-transmitting film on the LED chip, and a light-transmitting bonding layer between the light-transmitting film and the semiconductor LED chip. At least one of the light-transmitting film and the light-transmitting bonding layer may include a wavelength conversion material configured to convert light emitted by the semiconductor LED chip into light having a wavelength different from a wavelength of the emitted light. The light-transmitting bonding layer may have a lateral inclined region extending to the lateral surface to form an inclined surface. The semiconductor light emitting device may further include a reflective packaging portion surrounding the light-transmitting bonding layer, covering the first surface such that an electrode of the LED chip is at least partially exposed. The reflective packaging portion may include a reflective material.
Abstract:
A discharge circuit unit for minimizing standby power occurring in a standby mode and an image forming apparatus having the same are provided. The discharge circuit unit is connected to an input line of alternating current (AC) power and discharges a capacitive element for reducing noises. The discharge circuit unit includes a discharge circuit including first and second resistance units connected in series to discharge the capacitive element in response to a discharge control signal generated when an input of the AC power is interrupted, and a detection circuit that detects whether the input of the AC power is interrupted, and includes third and fourth resistance units connected in series so as to generate the discharge control signal when it is detected that the input of the AC power is interrupted. Each of the first to fourth resistance units includes at least one of a resistor and a switch.
Abstract:
A light emitting diode (LED) lens comprises a light incident surface on a bottom surface of the LED lens facing a light source. A light exit surface, having a size greater than the bottom surface, is defined by a top surface of the LED lens. A planar portion, emitting light incident through the light incident surface, is in a central region of the light exit surface. At least one protrusion portion, protruding to be stepped with respect to the planar portion, is in a region of the light exit surface except for the central region. A reflective surface, defined by lateral surfaces of the LED lens between the top surface of the LED lens and the bottom surface thereof, guides the light incident through the light incident surface, and contacts a lower portion of the light exit surface corresponding to a boundary between the protrusion and the planar portions.
Abstract:
An interface unit that interrupts overcurrent or overvoltage resulting from a ground voltage difference between electronic products interconnected through interface devices, so as to prevent damage to the products and risk of fire. The interface unit, which connects a first electronic product and a second electronic product to each other, includes a first interface device provided in the first electronic product and connected with the second electronic product, a second interface device provided in the second electronic product and connected with the first interface device through a VCC line and a ground line, and a ground overcurrent interrupter installed on the ground line, the ground overcurrent interrupter interrupting overcurrent flowing in the ground line.