35results about How to "Lighting control" patented technology

One embodiment of the present invention provides a system for preventing incorrect lighting changes in a daylight-harvesting system, which controls the output of a lighting system based on the presence of daylight and/or other light sources to reduce energy usage. During operation, the system measures a first light level using a first sensor. Next, the system measures a second light level for a different field-of-view using a second sensor. When the system detects through the first sensor a change in the first light level, the system determines from the second sensor whether the second light level has also changed. If the first sensor and the second sensor both detect a change (in the same direction) in the measured light levels, the system adjusts the light output of the lighting system to maintain target light levels for the area.

At least one exemplary embodiment can control light emission so as to facilitate a face area of a subject to be adequately photographed. In the at least one exemplary embodiment, respective face areas of the subject can be detected from captured image signals acquired before and after preliminary light emission, and a luminance comparison calculation can be performed between the detected face areas from the captured image signals, so that light amount control can be performed in an area centered on the face area of the subject.

A light emitting device of III-V group compound semiconductor includes a first stack and a second stack. The first stack includes a semiconductor stack including a light emitting layer. A multilayered reflective structure for reflecting light from the light emitting layer and a first metal bonding-layer are successively formed on the semiconductor stack. The second stack includes a second metal bonding-layer. The first and second stacks are bonded together by bonding the first and second metal bonding-layers to each other. The multilayered reflective structure includes a transparent conductive oxide layer and a reflective metal layer adjacent thereto in this order from the side of the semiconductor stack. The thickness of the transparent conductive oxide layer is adjusted to control the light emission characteristics.

A light emitting device includes: a plurality of unit circuits each of which includes a driving transistor for generating a driving current corresponding to a potential of a gate and a light emitting element for emitting light having a brightness corresponding to the driving current; a plurality of signal processing units which correspond to the unit circuits; and a designating unit which designates voltages to the signal processing units. Each of the plurality of signal processing units includes: a voltage adjusting unit which variably outputs a voltage to operate the driving transistor in a saturated region in response to a designation by the designating unit; and an output unit which outputs the voltage output from the voltage adjusting unit to the gate of the driving transistor corresponding to the signal processing unit at a time density corresponding to a gray-scale value designated to the light emitting element.

A diode chip is sealed by a glass material.

There are provided a light emitting diode chip and a glass member in close contact with at least one portion of the surface of the light emitting diode chip. The glass member has a surface shape containing a curved surface at least a portion thereof. The curved surface is preferably a portion of a spherical surface or a spheroidal surface. The glass member has a surface shape containing a spherical portion and a flat portion, and the diode chip is preferably disposed on the flat portion.

The invention discloses an energy-saving lamp with a shade and an assembly method thereof. The energy-saving lamp comprises a spiral tube and a glass shade, wherein a 4-10mm high cold end is arranged at the top end of the spiral tube and is provided with mercury source substances for releasing mercury vapor; the top of the cold end is contacted with the bottom of the inner wall of the glass shade; transparent insulation glue is arranged at the bottom of the glass shade; the cold end is positioned in the insulation glue, thus the tube can use the low temperature mercury source substances though working under high temperature and the lighting effect of the energy-saving lamp can be ensured not to be affected, thereby realizing rapid lighting of the energy-saving lamp; and the insulation glue can further prevent influence of conduction of the hot air in the glass shade, thereby better controlling the temperature of the cold end and improving the heat dissipation property of the spiral tube. The assembly method can ensure the cold end at the top of each spiral tube to be effectively contacted with the bottom of the inner wall of the glass shade, without being affected by the dimensional tolerance of the spiral tube and the glass shade.

A discharge lamp lighting circuit is provided. The discharge lamp lighting circuit includes a power supplying portion which comprises an inverter circuit comprising a switching element; a series resonant circuit comprising a capacitor, and at least one of an inductor and a transformer; and a driving circuit which drives said switching element, said power supplying portion converting DC power to AC power and supplying the AC power to a discharge lamp; and a controlling portion which produces a frequency control signal for controlling a frequency of a drive signal output from said driving circuit, the controlling portion including a phase difference detecting portion which detects a phase difference between an input voltage and an input current that are supplied from said inverter circuit to said series resonant circuit; and a control signal producing portion which produces the frequency control signal in accordance with the phase difference.

The present invention provides a light irradiation apparatus for an exposure apparatus capable of restraining electric power consumption corresponding to necessary luminous intensity and capable of performing simple control to the light source part, its lighting control method, exposure apparatus and substrate. The optical control part 76 has a plurality of lighting mode groups with different numbers of illumined light source part 73, and each lighting mode group respectively has a plurality of lighting modes A1 to D1, A2 to D3, A3 to D3 lighted up by the light source part 73 in point symmetric mode. Furthermore, the optical control part 76 controls that a preset number of light source parts 73 are lighted up at point symmetry mode according to identical lighting mode, therefore all light source parts 73 are lighted up in point symmetry mode.

Provided is a light assembly including a bulb, a lamp base enclosure having circuitry therein configured to supply power to the bulb, and an integrated and dial electrically coupled to the bulb and the lamp base. The dial is operable for selecting one of a plurality of predetermined power settings for the light assembly prior to installation.