37results about How to "Uniform excitation" patented technology

This invention relates to LED field, which discloses a white light LED and its packaging method. The white light LED includes chip, frame, silicon glue, fluorescence power film and periphery parts (such as lens). Difference between the packaging structures is that the space between the fluorescence power and chip is isolated by some materials such as silicon glue, which makes the heat of the fluorescence power and chip isolate; and the fluorescence power film brim contacts with the substrate, which makes the fluorescence power's heat conduct to the exterior to avoid the gather of fluorescence power heat. The chip is fixed on the frame, the silicon glue covers on the chip directly, the designed and prepared fluorescence power film cover on the silicon glue, and the fluorescence power film contact with the cup bowl. This method improves the light producing efficiency, and improves the stability of the light color greatly, and lowers the light decline. And the packaging method is simple, which is fit for industrial production in large scale.

A method and apparatus are described that couples a plurality of electromagnetic sources to a material for the purpose of either processing the material or promoting a chemical reaction. The apparatus couples various electromagnetic sources of various frequencies, including provision for static magnetic fields, radio frequency fields, and microwave fields, with the possibility of applying them all simultaneously or in any combination.

The invention relates to a device and method for testing medium material radiation induction conductivity for a satellite, and belongs to the field of testing. The device and method for testing the medium material radiation induction conductivity for the satellite is applicable to a test on thicker medium material radiation induction conductivity in an electrification effect evaluation inside the satellite. The device comprises a shielding box body, a 60Co irradiation source, a vacuum-pumping system, an upper electrode plate, a lower electrode plate, a sample table, an electrometer, a stabilized voltage source, a titanium window and a vacuum box. The method comprises the steps of utilizing the 60Co irradiation source to generate gamma ray irradiation medium materials, meanwhile utilizing the stabilized voltage source to exert voltage on electrodes on the medium materials, testing a leakage current of the lower electrode plate through the electrometer, obtaining a voltage value V and a current value I of the surface of the medium materials, and further calculating to obtain radiation induction conductivity of the medium materials. The device and method for testing the medium material radiation induction conductivity for the satellite is applicable to the test on the thicker medium material radiation induction conductivity in the electrification effect evaluation inside the satellite.

In a method for non-selective excitation of nuclear spin signals in an examination subject with a magnetic resonance system, RF excitation pulses are radiated to excite nuclear spin signals in the examination subject with simultaneous switching of gradients for spatial coding of the excited nuclear spin signals, wherein the RF excitation pulses are designed such that the base frequency of a radiated RF excitation pulse is adapted to the simultaneously switched gradient. By the dynamic adaptation of the radiated RF excitation pulses to the respective simultaneously switched gradients, artifacts due to insufficiently excited nuclear spins in an examination region to be examined (in particular even in examination regions that are arranged off-center) are avoided.

A solar spike lamp with long-lasting phosphor materials comprises a housing (1), the long-lasting phosphor materials (2), one or more LED light sources (3), a power storage element (4), a solar photovoltaic device (5), a control circuit board (6), optical elements (7), retroreflective materials (8) and package resin (9), wherein the control circuit board (6) intermittently supplies power to the one or more LED light sources (3) at a certain duty ratio or at a certain cycle. According to the solar spike lamp with the long-lasting phosphor materials, the stroboflash fluctuation depth is reduced by utilizing the long-lasting energy storage luminescence characteristic, and the power consumption of the power storage element (4) is reduced by reducing the duty ratio or lengthening the period; based on the principle, the novel all-weather solar spike lamp with stronger functions and higher safety and environmental protection property can be designed and manufactured, not only is the original function improved, but also the auxiliary illuminating lamp function is integrated under the condition of not increasing the power consumption, and thus the application range is expanded greatly.

The invention relates to a method for realizing solar-spectrum-like white light with low blue light harm and a white-light LED. The method is characterized by exciting, by blue-light chips of three main wavelength ranges, yellow phosphors, green phosphors and red phosphors to form white light. The white light obtained by the method is highly similar to the solar spectrum, close to natural light, low in blue light harm, beneficial to vision health, and particularly suitable for the field of educational illumination, and provides students with a health light environment for a long time. The white-light LED, based on the method, can form a solar-spectrum-like white light with low blue light harm in the optical principle. In the structural process, the yellow phosphors, the green phosphors, the red phosphors and an encapsulant are mixed, and then uniformly coat the surface of the blue-light chip by a centrifugal process, so that the phosphors can be uniformly excited, The wall of a reflector cup is silver plated so as to increase light reflection and increase a light extraction rate.

The invention relates to a method for realizing the low blue light hazard and high circadian rhythm factor light, and an LED light source. The method is advantaged in that the yellow phosphor and thegreen phosphor are excited by a blue chip and a violet chip of different main wavelength ranges to form the light. The method is advantaged in that the obtained light can not only reduce visual fatigue, but also reduce the blue light hazard, can further adjust the circadian rhythm factor, improve students' attention and enhance learning efficiency. According to the method described above, the LEDlight source can form the light with the low blue light hazard and the high circadian rhythm factor in the optical theory, in the structural process, the yellow phosphor, the green phosphor and the encapsulant are mixed, and uniformly coated on surfaces of the blue chip and the violet chip through the centrifugal process to uniformly excite the phosphor, a cup wall of a reflector cup is plated with silver, light reflection is improved, and the light output rate is improved.

A coil for magnetic resonance imaging operates in a transmit mode with multiple loops locked together in a phase relationship like a birdcage coil to provide a uniform transmission field, but in a receive mode like a phased array coil, each coil operating independently to produce a separate signal for reception by the MRI machine. Phasing of the coil during transmit mode is provided by a ring resonator controllably coupled to the loops. Controllable coupling is provided by a series of current limiting elements interposed between the resonant ring and the loops of the coil.

The invention provides a plasma generating device, comprising a hollow cavity, a slow wave antenna, and an electromagnetic wave generator. The hollow cavity is provided with an accommodating room. The slow wave antenna is provided with a center conducting pipe penetrating through the accommodating room, and a set of dielectric tubes arranged on the center conducting pipe. The electromagnetic wave generator is coupled with the electromagnetic wave on the slow wave antenna, thus the electromagnetic wave generator transmits and radiates the electromagnetic wave to the accommodating room through the slow wave antenna to generate the plasma with uniform intensity.

The present disclosure relates to a backlight source, including: a top substrate, a bottom substrate including a flexible circuit board, a reflective layer configured on a side of the top substrate, a light conversion layer, made of quantum dot (QD) material, configured on a side of the reflective layer, at least one light-emitting diode (LED) blue-light emitting chip configured on a side of the bottom substrate, a silicone layer configured between the light conversion layer and the bottom substrate. The opening is configured to change a refractive direction of a central optical path and to reduce an intensity of central light beams, such that light beams emitted from the at least one LED blue-light emitting chip are reflected by the reflective layer after passing through the corresponding opening to uniformly excite the QD material of the light conversion layer, and to eliminate yellow halo phenomenon.

A magnetic resonance imaging apparatus capable of receiving magnetic resonance signals with a plurality of coils while uniformly exciting such signals is to be provided. An RF coil of the magnetic resonance imaging apparatus is provided with an original loop unit, and a conductor which is so connected to the original loop unit as to split the original loop unit into split loop units. A control unit applies a high frequency magnetic field with the original loop unit and receives magnetic resonance signals with the split loop units.

The invention discloses a high-quality full-color semiconductor light source. The light source is characterized in that: the semiconductor light source comprises an LED light-emitting unit, an LED support, packaging glue and the like, and the LED light-emitting unit comprises a red-light LED chip, a green-light LED chip and a blue-light LED chip; the LED support comprises a metal bonding pad, pinsand an outer lead frame; and the packaging glue comprises transparent glue and fluorescent powder adding glue. The LED chip is electrically connected with the support pins, then the LED chip is packaged through a two-layer packaging structure with transparent glue arranged on the lower portion and fluorescent powder glue arranged on the upper portion, and the upper surface of the transparent glueis higher than the LED chip. The red chip, the green chip and the blue chip are packaged together, so that a full-color light source can be obtained; meanwhile, fluorescent powder is added for packaging, and the color rendering property can be improved; and on the basis, the two-layer packaging structure is adopted, the excitation failure problem caused by fluorescent powder precipitation can beeffectively solved while the reliability of the light source is improved, and therefore the high-quality full-color light source is obtained.

The invention discloses a broadband low cross polarization microstrip patch phased-array antenna unit, and belongs to the technical field of microwave antennas. The antenna unit is composed of five layers of dielectric substrates, and the reflection floor is laid on the lower surface of the first dielectric substrate. The slot floor is laid on the lower surface of the second dielectric substrate, the feed microstrip line conduction band is laid on the upper surface of the second dielectric substrate, the square driving patch is laid on the upper surface of the third dielectric substrate, the square parasitic patch is laid on the upper surface of the fifth dielectric substrate, and the central area of the fourth dielectric substrate is hollowed out. The first support is used for supporting the fifth dielectric substrate; metal blind holes are formed in the periphery of the first dielectric substrate and used for connecting the reflection floor and the slot floor to form a closed metal cavity, metal through holes are designed in the periphery of the antenna unit to penetrate through all the dielectric substrates, and equivalent metal walls are formed around patches to block propagation of surface waves. According to the invention, the broadband, low-cross-polarization and wide-scanning-angle microstrip patch phased-array antenna unit with a multilayer structure can be obtained.

Disclosed is a fluorescent-powder setting method which includes: providing a wafer which includes a substrate and epitaxial structures formed on the substrate, wherein each epitaxial structure includes a first semiconductor layer, a second semiconductor layer, a light-emitting layer located between the first semiconductor layer and the second semiconductor layer, a first electrode formed on the first semiconductor layer, and a second electrode formed on the second semiconductor layer; forming separated light-resistance structures which cover the first electrodes and the second electrodes respectively; covering the epitaxial structures and the light-resistance structures with a continuously distributed fluorescent power; removing part of the fluorescent power so as to expose the light-resistance structures; and removing the light-resistance structures and then exposing the first electrodes and the second electrodes outside. The fluorescent-powder setting method is capable of realizing uniform distribution of the fluorescent powder so that a phenomenon that color cast occurs in synthetic light is prevented. The invention also provides a manufacturing method for a light-emitting diode.

The invention provides an AC plasma display panel, which has a plurality of pixels containing sub-pixels distributed triangularly. The panel comprises an addressed electrode and an array electrode, wherein the array electrode comprises scanning electrodes and share electrodes, and each scanning electrode and share electrode is provided with a conflux electrode and a maintenance electrode. Shapes of the sub-pixels are approximately determined by a stunt wall; an upper substrate, a lower substrate and the stunt wall form discharge space; the addressed electrode is configured under the sub-pixels, and the array electrode is configured above the sub-pixels; the conflux electrodes and the maintenance electrodes of the array electrode are in electrical connection, and are characterized in that each maintenance electrode is in grid shape, and comprises a plurality of first connecting parts and a plurality of second connecting parts, wherein one end of the first connecting part is connected with the conflux electrode, and the second connecting part is connected with the other end of the first connecting part.

The display faceplate comprises several pixels including subpixels arranged in triangle. The faceplate contains addressing electrodes and column electrodes including scanning electrodes and common electrodes. Each scanning electrode and common electrode includes a confluence electrode and maintaining electrode. Shape of subpixel is dependent on an obstruct wall. Upper/lower base plates and obstruct wall form a discharging space. Addressing electrodes are arranged under subpixels, and column electrodes are arranged above subpixel. Confluence electrode of column electrode is connected to maintaining electrode electrically. Characters are that each maintaining electrode in grid type including several first connection parts and a second connection part. One end of the first connection part is connected to confluence electrode, and the other end of the first connection part is connected to the second connection part.

A device for influencing biological sequences in living tissue, in particular a human body, includes a field generation device for generating the pulsating magnetic field to be applied to at least a part of the tissue, and a pulse generator controlling the field generation device. The pulsating magnetic field is composed of a sequence of primary pulses which are formed by a plurality of superimposed sub-pulses, the pulse repetition rate of which is between 0.01 and 1000 Hz. The sequence of primary pulses separated is from a second sequence of primary pulses by a rest phase. The curve profile of the maximum amplitude of the primary pulses has a slope mB of −∞<mB<−0.1 at the beginning of the rest phase and/or has a slope mE of ∞>mE>0.1 at the end of the rest phase.