An optical element for transmission of light produced by a solid state emitter includes at least one diffuser element, and a reflector supported by the at least one diffuser element and paced-apart from the emitter, the reflector defining an annular lip having an aperture therein and an axis normal to a plane defined by the aperture. The reflector further includes a first frustoconical surface coupled with the annular lip and angling outwardly in a first direction at a first angle relative to the axis, a second frustoconical surface coupled to the first frustoconical surface and angled outwardly at a second angle in a second direction opposite to the first direction, and a third surface coupled with the second frustoconical surface and angling outwardly at a third angle.

An optical element for transmission of light produced by a solid state emitter includes at least one diffuser element, and a reflector supported by the at least one diffuser element and paced-apart from the emitter, the reflector defining an annular lip having an aperture therein and an axis normal to a plane defined by the aperture. The reflector further includes a first frustoconical surface coupled with the annular lip and angling outwardly in a first direction at a first angle relative to the axis, a second frustoconical surface coupled to the first frustoconical surface and angled outwardly at a second angle in a second direction opposite to the first direction, and a third surface coupled with the second frustoconical surface and angling outwardly at a third angle.

A synthetic jet cooling device (1) for cooling an object (5), comprising: a transducer (10) adapted to generate velocity waves, and an enclosure (4) arranged to receive the velocity waves via an actuated aperture (8). The enclosure (4) is sufficiently large to generate, at the actuated aperture (8), an internal synthetic jet inside the enclosure (4). Furthermore, the enclosure (4) is arranged to contain the object (5), thereby enabling cooling of the object (5) by the internal synthetic jet. The arrangement typically permits multifunctional use of an existing enclosure, containing the object to be cooled, both for its original purpose (e.g. a reflector in a lamp, or a LED backlight module) and as an enclosure generating internal synthetic jets, why the cooling device typically requires virtually no extra space and weight, and can be provided at a low cost.

A synthetic jet cooling device (1) for cooling an object (5), comprising: a transducer (10) adapted to generate velocity waves, and an enclosure (4) arranged to receive the velocity waves via an actuated aperture (8). The enclosure (4) is sufficiently large to generate, at the actuated aperture (8), an internal synthetic jet inside the enclosure (4). Furthermore, the enclosure (4) is arranged to contain the object (5), thereby enabling cooling of the object (5) by the internal synthetic jet. The arrangement typically permits multifunctional use of an existing enclosure, containing the object to be cooled, both for its original purpose (e.g. a reflector in a lamp, or a LED backlight module) and as an enclosure generating internal synthetic jets, why the cooling device typically requires virtually no extra space and weight, and can be provided at a low cost.

In a first aspect of the present inventive subject matter, a light-emitting device includes a magnetic circuit including a magnetic gap; a movable member including a coil that is electrically connectable to an alternating current power source and arranged in the magnetic gap of the magnetic circuit; and a light source including a light-emitting diode and arranged above the movable member, and the movable member is able to be activated with a voltage falling in a range of one to five percent of an entire voltage range that is applicable to the light-emitting device.

In a first aspect of the present inventive subject matter, a light-emitting device includes a magnetic circuit including a magnetic gap; a movable member including a coil that is electrically connectable to an alternating current power source and arranged in the magnetic gap of the magnetic circuit; and a light source including a light-emitting diode and arranged above the movable member, and the movable member is able to be activated with a voltage falling in a range of one to five percent of an entire voltage range that is applicable to the light-emitting device.

Disclosed is a lighting apparatus which has a heat radiation function by a non-powered blowing structure and comprises a housing, a cylin-drical anion emission pipe, a discharge electrode, an induction electrode, an LED circuit board, and a lighting cover. In the lighting apparatus of the present invention, when anions are emitted from the discharge electrode, air outside the lighting cover is introduced into the cylindrical anion emission pipe via an air through-hole, and then discharged to the outside via a second end of the cylin-drical anion emission pipe to be circulated; a space in which the LED circuit board is disposed is in air communication with the air through-hole, such that when an air flow is created through the air through-hole by anions emitted from the discharge electrode, the space with the LED circuit board disposed therein also has an air flow created therein, and through such air flow, heat generated by an LED chip on the LED circuit board is emitted. The lighting apparatus according to the present invention may achieve excellent heat radiation func-tion even without employing a complicated or heavy heat radiation.

Disclosed is a lighting apparatus which has a heat radiation function by a non-powered blowing structure and comprises a housing, a cylin-drical anion emission pipe, a discharge electrode, an induction electrode, an LED circuit board, and a lighting cover. In the lighting apparatus of the present invention, when anions are emitted from the discharge electrode, air outside the lighting cover is introduced into the cylindrical anion emission pipe via an air through-hole, and then discharged to the outside via a second end of the cylin-drical anion emission pipe to be circulated; a space in which the LED circuit board is disposed is in air communication with the air through-hole, such that when an air flow is created through the air through-hole by anions emitted from the discharge electrode, the space with the LED circuit board disposed therein also has an air flow created therein, and through such air flow, heat generated by an LED chip on the LED circuit board is emitted. The lighting apparatus according to the present invention may achieve excellent heat radiation func-tion even without employing a complicated or heavy heat radiation.

A device (1, 100) for controlling a flow of a gaseous fluid is disclosed. The device comprises a first electrode (10, 110) and a second electrode (20, 120) offset from the first electrode in a downstream direction of the flow. The electrodes are connectable to a voltage source. A thermally conducting flange (30) is arranged to extend in a plane parallel to a direction of the flow and adapted to dissipate heat from the gaseous fluid. At least a portion of the first electrode has a maximum height (h.sub.1) in a direction parallel to a direction of the flow and a maximum width (w.sub.1) in a direction orthogonal to the direction of the flow, wherein said maximum height is larger than said maximum width so as to improve the pumping efficiency of the device. A method for manufacturing the device, and a method for controlling a fluid flow by means of such device, is also disclosed.

A lighting apparatus having a heat radiation function by a blowing structure comprising a housing, a cylindrical anion emission pipe, a discharge electrode, an induction electrode, an LED circuit board, and a lighting cover. When anions are emitted from the discharge electrode, air outside the lighting cover is introduced into the cylindrical anion emission pipe via an air through-hole, and then discharged to the outside via a second end of the cylindrical anion emission pipe to be circulated; a space in which the LED circuit board is disposed is in air communication with the air through-hole, such that heat generated by an LED chip on the LED circuit board is emitted. The lighting apparatus may achieve excellent heat radiation function without employing a complicated or heavy heat radiation device.