390results about How to "Increase heat radiation" patented technology

A light emitting device that can provide enhanced heat radiation as well as allowing light from a light emitting diode (LED) chip to be efficiently extracted out of the device. This light emitting device includes a metal plate (11) that is made of aluminum. The metal plate (11) has a projection (11a) projecting forward. The projection (11a) has a front side provided with a housing recess (11b). An LED chip (1) is mounted on the bottom of the housing recess (11b) so that it is thermally coupled to the metal plate (11), thus allowing heat to be radiated efficiently. A printed circuit board (12), having a grass epoxy substrate to be joined to the front surface of the metal plate (11), is provided with an insertion hole (13) into which the projection (11a) is inserted. The LED chip (1) and a bonding wire (W) are encapsulated in a transparent resin seal portion (50). The side wall of the housing recess (11b) that is part of the metal plate (11) functions as a reflector for reflecting forward light emitted from the LED chip (1). Thus, light from the LED chip (1) can be extracted efficiently.

An LED lighting device comprises: a thermally conducting body having an at least one opening that connects with a cavity within the body and a plurality of LEDs mounted in thermal communication with a face of the body and positioned around the opening. One or more passages pass through the body from the cavity to an outer surface of the body and are configured such that in operation air moves through the cavity by thermal convection thereby to provide cooling of the body. Each passage is configured in a direction that extends in a direction at an angle of about 45° to a line that is parallel with the axis of the body toward the outer surface of the body away from the face. The body can be configured such that its outer surface has a form factor resembling an incandescent light bulb or halogen reflector lamp.

It is an object of this invention to provide an alternator for a vehicle in which all electric conductors forming bridge portions are sufficiently exposed to cooling winds so that the cooling performance is remarkably improved. It is another object of this invention to provide an alternator for a vehicle which is excellent in cooling performance, insulating characteristic, and heat resisting property. An alternator for a vehicle includes a stator. The stator includes an iron core 22, an electric conductor 21, and an insulator 23. The electric conductor 21 forms a winding on the iron core 22. The insulator 23 provides electric insulation between the electric conductor 21 and the iron core 22. The stator is supported by a housing. The dimension of openings of slots in the iron core 22 is smaller than the distance between inner side surfaces of the slots. The electric conductor 21 has accommodated portions accommodated in the slots, and bridge portions connecting the accommodated portions. Pieces of the electric conductor which extend out of the slots are approximately separated into a conductor groups 21f located on outer radial sides of the slots and a conductor group 21g located on inner radial sides of the slots, and form the bridge portions. Predetermined gaps are provided between pieces of the electric conductor in the bridge portions. The bridge portions have ridge portions inclined in a same circumferential direction in each of the outer radial side and the inner radial side, and top portions connecting the ridge portions along an axial and radial direction.

There is provided a light source device which can miniaturize a two-dimensional image display device as small as possible. The light source device is provided with three coherent light sources (11a), (11b), and (11c) corresponding to red, blue, and green; prisms (12a) and (12c) for reflecting lights emitted from the coherent light sources (11a) and (11c); and a diffraction part (20) comprising a single volume hologram on which plural gratings are multiply-formed, which gratings diffract the light emitted from the coherent light source (11b), and the lights that are emitted from the coherent light sources (11a) and (11c) and reflected by the prisms (12a) and (12b) so that these lights propagate in the same optical path.

In order to provide a semiconductor apparatus in which both semiconductor chips and interposers are provided on a carrier tape, electrical properties can be improved using short wiring in a wiring pattern substantially symmetric with respect to the semiconductor chips, production can become easier, and compactness and heat radiation can be improved. Semiconductor chips electrically connected to wiring formed on the carrier tape, and interposers on the carrier tape and surrounding the semiconductor chips, are provided next to each other.

An apparatus (100) for transferring heat from a first substrate (140) rotatably mounted to a second substrate (150). The apparatus (100) is comprised of at least a first fin ring (145) disposed concentrically on a first side surface (141) of the first substrate (140). A plurality of heat generating devices (130) is disposed on a second side surface (142) of the first substrate (140). There is at least a second fin ring (155) disposed concentrically on a first side surface (151) of the second substrate (150). The first fin ring (145) interleaves with the second fin ring (155) while allowing the first substrate (140) to rotate unobstructed relative to the second substrate (150). The second substrate (150) has at least a first port (160) for introducing moving air into a gap (G) defined between the first fin ring (145) and the second fin ring (155) for improving heat convection there between.

A secondary battery includes an electrode assembly in which a first electrode plate, a separator, and a second electrode assembly are sequentially stacked forming a stack and is wound about one edge of the stack, and a plurality of finishing tapes attached to the outer surface of the electrode assembly and spaced apart from each other along the winding direction of the electrode assembly.

A semiconductor laser device includes a semiconductor device layer having an emission layer and formed with a current path on a semiconductor layer in the vicinity of the emission layer, a current blocking layer formed in the vicinity of the current path, and a heat-radiation layer formed to be provided at least in the vicinity of a region formed with a cavity facet of the semiconductor device layer and be located above the current path, and having thermal conductivity larger than that of the current blocking layer.

A pulley includes a radial rolling bearing and a pulley main body which are integrated to each other by an insert molding method. Therefore, a metal insert member is not required between the resin pulley main body and the radial rolling bearing, thereby reducing production cost of the pulley. Further, an axial dimension of an outer ring of the radial rolling bearing is set larger than an axial dimension of an inner ring thereof, so that a contact area between the radial rolling bearing and the pulley main body is increased. Therefore, a connection strength between the radial rolling bearing and the pulley main body is increased, and a surface area of the radial rolling bearing is increased, thereby improving heat radiation performance of the radial rolling bearing.