摘要:
An LED lamp includes a light source including LEDs and a heat dissipation device. The heat dissipation device includes a heat absorption board contacting the light source to absorb heat generated by the LEDs, a fin assembly located over the heat absorption board, two heat pipes thermally connecting the heat absorption board and the fin assembly, a fan and a fan holder fixing the fan on the fin assembly. The fan holder includes a supporting board supporting the fan and supporting posts connecting an outer edge of the heat dissipation board and an outer edge of the supporting board. The supporting posts are embedded in the fin assembly.
摘要:
An exemplary heat sink assembly includes a heat sink and a clip resiliently clamping the heat sink on a printed circuit board. The heat sink includes a base and a plurality of first fins and two central second fins extending upwardly from the base. The clip includes a locating portion fixed between the second fins of the heat sink, a pair of elastic portions extending outwardly from opposite ends of the locating portion and oriented towards substantially opposite directions, and two hooks extending outwardly from ends of the operating members, respectively. An acute included angle is formed between each elastic portion and the locating portion of the clip in an original relaxed position, and the acute included angles become approximately right angles when the clip is preassembled in the heat sink with the elastic portions abutting the second fins.
摘要:
An LED reading lamp includes a base, a supporting bracket fixed on the base, a heat sink mounted on the supporting bracket and an LED module mounted on a bottom surface of the heat sink. The supporting bracket has a vertical part vertically fixed on the base and a horizontal part extending horizontally from an upper end of the vertical part. The horizontal part defines an opening therein. The heat sink is placed on a top surface of the supporting bracket and located over the opening. The LED module is received in the opening of the horizontal part.
摘要:
A light emitting diode (LED) lamp includes a light emitting module; a power module for driving the light emitting module; and a housing having an optical part for receiving the light emitting module, an electrical part for receiving the power module. The light emitting module includes a plurality of circuit boards sequentially arranged parallel to each other, a plurality of first LED chips which has lenses covered thereon being mounted on the circuit boards, and a plurality of second LED chips which has no lens covered thereon being mounted also on the circuit boards. The first and the second LED chips are arranged in columns and rows. The second LED chips are located symmetrically in respect to the first LED chips.
摘要:
An electronic device assembly includes an electronic device and a bracket holding the electronic device. The bracket includes a first supporting seat defined a first receiving groove therein and a second supporting seat defined a second receiving groove therein. The first supporting seat is disengagably attachable to the second supporting seat according to either of two selectable arrangements. In a first one of the arrangements, the first receiving groove and the second receiving groove cooperatively define a first receiving chamber having a first width for holding the electronic device in a first orientation. In a second one of the arrangements, the first receiving groove and the second receiving groove cooperatively define a second receiving chamber having a second width for holding the electronic device in a second orientation.
摘要:
A light emitting diode driving circuit comprising a power supply circuit, a rectifier circuit, a light emitting diode load and a controlling circuit. The rectifier circuit is connected between the power supply circuit and one port of the light emitting diode load. The other port of the light emitting diode load is connected to ground through a transistor. of the controlling circuit. The power supply circuit, the rectifier circuit, the light emitting diode load are connected to the ground when the transistor is turned on and disconnected from the ground when the transistor is turned off. The controlling circuit further comprises a pulse generating unit which controls the turn on/off of the transistor.
摘要:
An illumination system includes an LED lamp, a timer, a controlling circuit, a driving circuit and a power source electrically connected together. The timer produces different signals to the controlling circuit at different periods, thereby driving the LED lamp to lighten with different brightness. A light or movement sensor is further electrically connected to the LED lamp to work together with the timer. The sensor cooperating with the timer, detects light or movement of an object to drive the LED lamp to lighten for a while with a corresponding brightness.
摘要:
An electronic apparatus includes a circuit board, a first and a second electronic components installed on the circuit board, and a heat dissipation device. The heat dissipation device includes a centrifugal fan defining a first air outlet and a second air outlet, a first fin assembly disposed at the first outlet of the centrifugal fan, a second fin assembly disposed at the second outlet of the centrifugal fan and thermally contacting the second electronic component, and a heat pipe. The heat pipe includes an evaporating section, a first condensing section and a second condensing section located at two ends of the evaporating section. The evaporating section thermally contacts the first electronic component. The first condensing section is thermally attached to the second fin assembly, and the second condensing section is thermally attached to the first fin assembly.
摘要:
An exemplary heat dissipation device includes a centrifugal fan comprising an air outlet, a fin assembly arranged at the air outlet, and a heat pipe comprising an evaporating section and a condensing section. The fin assembly comprises fins. The fins are stacked together with one above another along a central axis of the centrifugal fan. Each of the fins has at least a flange bent at a lateral side thereof. The flanges of the fins abut against each other and form a side face parallel to the central axis of the centrifugal fan. The condensing section is attached to and thermally contacts the side face of the fin assembly.
摘要:
An LED unit includes an LED and a lens mounted on the LED. The lens includes a light-incident face adjacent to the LED, a light-emergent face remote from the LED, and a light-reflecting face between the light-incident face and the light-emergent face. The light-incident face includes a first light-incident face facing the LED, and the light-emergent face includes a first light-emergent face located opposite to the first light-incident face. The first light-incident face is a continuously curved face which has a curvature, along a bottom-to-top direction of the lens, firstly decreasing gradually to a first value; then increasing gradually to a second value; then decreasing gradually again to a third value; and then increasing gradually again. The light-emergent face has a first light-emergent face located above the first light-incident face and having a varied curvature.