105results about How to "Stable light output" patented technology

An efficient and flexible current-mode driver delivers power to one or more light sources in a backlight system. In one application, the current-mode driver is configured as an inverter with an input current regulator, a non-resonant polarity-switching network, and a closely-coupled output transformer. The input current regulator can output a regulated current source in a variety of programmable wave shapes. The current-mode driver may further include a rectifier circuit and a second polarity-switching network between the closely-coupled output transformer and a lamp load. In another application, the current-mode driver delivers power to a plurality of light sources in substantially one polarity by providing a regulated current to a network of time-sharing semiconductor switches coupled in series with different light sources coupled across each semiconductor switch.

A controller 5 for a high intensity discharge lamp 4 includes a primary ballast for providing a primary current to the lamp 4, and a current injector which in the case shown comprises a control ballast 8 and a switch 9 (e.g. a triac) controlled by a control unit 12. The current injector injects a secondary current into the lamp 4 that is less than the primary current and can be varied by the control unit 12, e.g. by varying the amount of time within an a.c. cycle that the control ballast 8 is switched into the circuit. The controller 5 allows the lamp 4 to be controlled, for example, to operate at a constant power (variable light output) or at a constant light output (variable power).

The invention relates to a light-emitting diode lamp comprising a lamp body, an optics part, a heat radiation part and an electric part, wherein the lamp body is provided with a plurality of transom windows, the heat radiation part and the electric part are arranged in the lamp body, the heat radiation part comprises a mounting seat and a heat radiator provided with a plurality of fins. The mounting seat is arranged at one end of the heat radiator, near the optics part, and is in heat-conduction connection with the heat radiator; the mounting seat is a polyhedron and comprises a polygonal heat conduction surface facing the heat radiator and a plurality of heat absorption surfaces. The electric part is arranged at the rear end of the heat radiation part and comprises a circuit board. The optics part is arranged at the front end of the heat radiation part and comprises a plurality of light-emitting diode light sources, a reflecting cover and a light guide cover. The light sources are arranged on the heat adsorption surface of the mounting seat; the reflecting cover is arranged between the light sources and the heat radiator and is provided with a reflecting surface facing the light sources; the light guide cover is arranged at the outer side of the reflecting cover, and the light sources and the mounting seat are arranged in the light guide cover; and the heat adsorption surface extends towards the light guide cover from the margin of the heat conduction surface.

The invention discloses a light-emitting diode lamp which comprises a heat radiating part, an optical part and an electric part. The heat radiating part comprises a heat exchange loop device. The heat exchange loop device comprises a first heat radiator, a heat absorber plate, a second heat radiator, a first cover plate, a heat-insulating element and an annular second cover plate. The first heat radiator, the heat absorber plate, the second heat radiator, the first cover plate and the second cover plate form a closed first cavity body; and a second cavity body opened toward a top end is formed in the second heat radiator. A capillary structure is arranged on the surface of a side wall inside the first cavity body. A working fluid is filled in the capillary structure. The heat-insulating element is arranged in the first cavity body and between the first cover plate and the heat absorber plate. The heat-insulating element comprises a heat-insulating plate which is arranged near the first cover plate and provided with a plurality of through holes. The heat-insulating plate of the heat-insulating element can effectively prevent a reflowing low-temperature condensate from being in contact with reverse high-temperature saturated steam directly for heat transfer to increase the flow resistance and the heat resistance of the condensate reflowing to an evaporation part.

The invention relates to a light-emitting diode lamp and a light engine adopted by the light-emitting diode lamp. The light-emitting diode lamp comprises an optical chamber, an electrical chamber and a heat radiating chamber, wherein the heat radiating chamber is arranged between the optical chamber and the electrical chamber; the optical chamber comprise at least one light-emitting diode light source and a light emergent passage; the electrical chamber comprises a shield and a circuit board; the heat radiating chamber comprises a heat radiator and a loop device; the heat radiator comprises an annular heat radiating base, a plurality of fins which are distributed at the peripheral surface of the heat radiating base, as well as a heat absorbing plate and a heating radiating cover plate which are respectively arranged at both ends of the heat radiating base; the heating radiating base, the heat absorbing plate and the heat radiating cover plate form a sealed cavity; the working fluid is filled into the cavity; the light-emitting diode light source is arranged on the outer surface of the heat absorbing plate; the loop device is arranged in the cavity and divides the cavity into an evaporating part, a condensing part, a steam passage and a reflux passage, and a capillary structure is filled into the reflux passage.

A display device capable of obtaining stable light output even in a state of low brightness and capable of displaying desired display colors is provided. An output control means (80) causes image-forming light to be emitted from a laser source (10) on the basis of image information when the scanning position of an RGB laser beam according to a scanning means (20) is within a display range, and causes detection light to be emitted from the laser source (10) when the scanning position is outside the display range. In addition, the output control means (80) changes the drive current of the laser source (10) according to a first current value that is less than a threshold current value, and second and third current values that are greater than or equal to the threshold value, when the scanning position according to the scanning means (20) is outside the display range; and drives the laser source (10) according to the drive current obtained by calculating the current-light output characteristics on the basis of the light intensity detected by a laser beam detection unit (40).

The invention relates to a yellow light afterglow material and a preparation method thereof as well as an LED illuminating device using the same. The yellow light afterglow material comprises the chemical formula of aY2O3.bAl2O3.cSiO2:mCe.nB.xNa.yP, where a, b, c, m, n, x and y are coefficients, and a is not less than 1 but not more than 2, b is not less than 2 but not more than 3, c is not less than 0.001 but not more than 1, m is not less than 0.0001 but not more than 0.6, n is not less than 0.0001 but not more than 0.5, x is not less than 0.0001 but not more than 0.2, and y is not less than 0.0001 but not more than 0.5; wherein Y, Al and Si are substrate elements, and Ce, B, Na and P are activators. The yellow light afterglow material is prepared by the following steps: weighing oxides of elements or materials which can generate oxides at high temperature by molar ratio as raw materials, evenly mixing and then sintering the raw materials at 1200-1700° in a reducing atmosphere.