98results 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.

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.

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.

The invention discloses a dye auto-polymerized thin film random laser. The dye auto-polymerized thin film random laser comprises external pump light and a thin film sample, wherein the thin film sample consists of a glass negative and a PDMS thin film; the glass negative and the PDMS thin film together form a leakage waveguide structure; and the PDMS thin film contains an auto-aggregated dye micro-nano crystal which is formed by auto aggregation of PM597 dye molecules. The invention furthermore discloses a preparation method of the dye auto-polymerized thin film random laser. According to the dye auto-polymerized thin film random laser, the low-concentration dye molecules are low in energy of self-absorption loss, so that the threshold value of the random laser is reduced and then the energy loss of the pump light is reduced; the solubility of the dye molecules change and the dye molecules aggregate to form the micro-nano crystal which serves as a scattering medium and a gain medium in a random laser outgoing process, so that the preparation method of the random laser is simplified; and the thin film random laser is low in threshold value and simple in preparation process.

An image display device includes an optical scanning part, a drive control part which supplies an electric current to lasers, and a light detecting part. The drive control part supplies an electric current to the lasers while changing a current value at two points or more when a scanning position of the light scanned by the optical scanning part is at a predetermined position outside an effective scanning range. Based on intensity of an inspection-use light detected by the light detecting part, current-light emitting quantity characteristics of the lasers are calculated, and electric currents supplied to the lasers are adjusted based on a result of the calculation.

The invention belongs to the field of high-power LED street lamp technology, concretely relating to a control method and a device for realizing long service life light intensity of a high-power light emitting diode street lamp. The invention has an adoption of closed-loop digital control; output light of LED is maintained to be strong in the whole service life span; and light decay thereof is compensated, thus guaranteeing a satisfactory luminous intensity in the service period of the street lamp; meanwhile, the service life of the LED street lamp can be prolonged. Concretely, optical signal output by the LED is detected, amplified, and converted by the device; the signal is filtered and judged and false signals are removed. In turn, light output of the lamp is regulated according to the light decay size obtained by calculation. The control method and a device for realizing long service life light intensity of a high-power light emitting diode street lamp also comprises a method for judging expiration of the service life of the lamp and sending out warning signal to an upper system at the expiration of the service life.

The invention relates to an alternating current LED light-emitting device, belonging to the LED manufacture technology field. The invention is aimed at solving a stroboscopic problem under alternating current power supply with low cost and problems of poor heat radiation and the like caused by microchip integration. A technical scheme of the present invention is as follows: an LED light-emitting unit comprises an LED chip and light-emitting material capable of emitting light under excitation of the LED chip, the LED light-emitting unit is characterized in that: an light-emitting life of the light-emitting material is 1 to 100 ms, the LED chip is the LED chip only comprising an light-emitting PN knot, and the LED light-emitting unit employs alternating current with frequency which is not larger than 100 Hertz for driving. The LED light-emitting device does not use a present alternating current LED chip which is integrated by a plurality of microcrystallites but uses a traditional single PN knot LED chip, fluctuation of luminance is not large in an alternating current period, the stroboscopic problem caused by an alternating current power supply is solved, production is simple, and cost is low.

A laminated composite includes: a 1st-conductive-type cladding layer laid on a substrate; an active layer laid on the 1st-conductive-type cladding layer; and a ridge-stripe 2nd-conductive-type cladding layer laid on the active layer. A pair of films is disposed at the end faces of the laminated composite so as to oppose each other along the lamination direction. The paired films are formed to have different spectral reflectances from each other. The resonator structure is formed with the laminated composite and the paired films. When, in the length direction of the resonator, a side with one of the paired films which has a smaller spectral reflectance is the forward side and a side with the other film having a larger spectral reflectance is the backward side, the laminated composite is structured so that the optical confinement factor becomes smaller on the forward side than on the backward side.

This invention provides an optical transmitter module and an optical module using an EA modulator capable of realizing stable ACER regardless of operating temperature without using a control mechanism for maintaining temperature of the EA modulator constant. In the EA modulator, optical waveguides formed of a multi-layered film are formed on a substrate, an electrical signal is applied to the optical waveguides in a direction vertical to the substrate, and the input light absorption amount is changed to control the amount of output light. Also, a plurality of p-side electrodes electrically separated from each other for applying an electrical signal to the active layer optical waveguides are arranged on optical axes of active layer optical waveguides. The length of optical waveguides to which the electrical signal is applied is changed by controlling the number of p-side electrodes to which the electrical signal is applied in accordance with temperature.

In a semiconductor laser element, a lower cladding layer, a lower optical waveguide layer, an InGaAs compressive-strain quantum-well active layer, an upper optical waveguide layer, and an upper cladding layer are formed in this order in a stripe-shaped region on a substrate. A current-blocking layer is formed on both sides of the compressive-strain quantum-well active layer so that the compressive-strain quantum-well active layer is sandwiched between two portions of the current-blocking layer, and trenches extending along the direction of the laser resonator are formed through the current-blocking layer. Instead of providing the trenches, the widths of the layers formed above the substrate are reduced so as to form a ridge structure.

The invention relates to a driving circuit which comprises a reference voltage circuit and a clock circuit, the reference voltage circuit and the clock circuit are connected onto the driving chip and comprise a first transistor and a second transistor, the output end of the driving chip is connected with the input end of the first transistor, the output end of the first transistor is connected with a voltage reduction circuit, the two ends of a capacitance of the voltage reduction circuit are connected with the two output ends of the second transistor, the other end of the capacitance is back fed to the driving chip, the two output ends of the second transistor are connected with a load, the input end of the second transistor is connected with a pulse-width circuit, the invention also relates to a projector comprising the driving circuit.

The invention relates to the technical field of air purification, in particular to a large-space disinfection device. The large-space disinfection device comprises an outer frame of the disinfection device. A fan is arranged in the center in the outer frame. The two sides of the fan are both provided with purification and disinfection modules. Each purification and disinfection module is composed of two sets of photocatalyst nets and an LED ultraviolet disinfection module arranged between the two sets of photocatalyst nets. An air inlet or an air outlet are formed in one side of the outer frame. An air outlet or an air inlet are formed in the other side of the outer frame. A filtering screen is arranged on the position of the air inlet or the air outlet. A power source controller and a control panel are arranged in the outer frame. The large-space disinfection device has the function of preventing the transmission diseases of an air system pipeline, the quality of working and living environment is improved, the purification and disinfection efficiency is high, the energy consumption is small, the wind resistance is small, and the large-space disinfection device has the great use and popularization value.

The invention discloses a host machine structure of a numerical control cutting machine in the field of laser cutting machines, comprising a machine body, a laser, a gantry beam, a movable crossbeam and a cutting head; the front side and the rear side of the machine body are provided with a supporting frame which is vertically arranged; the gantry beam is arranged between the upper sides of two supporting frames; when the laser emits the laser, the laser is transmitted to the cutting head; two ends of the gantry beam are fixedly connected with corresponding supporting frames respectively; the movable crossbeam which can move along the length direction of the gantry beam is suspended at the lower side of the gantry beam; the movable crossbeam and the gantry beam are vertically arranged in space; the cutting head which can move along the length direction of the movable crossbeam is suspended at the lower side of the movable crossbeam. The device leads the gantry beam to be fixedly connected with the supporting frame, reinforces the strength of the machine tool, and improves the stability of the machine tool; the middle driving of the movable crossbeam effectively reduces the vibration, leads the cutting head to realize the high-speed movement, and improves the cutting speed. The host machine structure can be used for the cutting of numerical control laser.

The invention belongs to the technical field of packaging preparation of light-emitting diode (LED) luminescent materials, and relates to a quantum dot wrapped phase-change paraffin microcapsule, an LED device and preparation methods of the phase-change paraffin microcapsule and the LED device. The quantum dot wrapped phase-change paraffin microcapsule comprises quantum dots, phase-change paraffinand methyl methacrylate-methacrylic acid copolymer shell material, wherein the quantum dots are dispersed and wrapped in the phase-change paraffin which is used as a spherical core of the microcapsule, and the methyl methacrylate-methacrylic acid copolymer outer shell coats the outer surface of the phase-change paraffin wax in a spherical shell shape. The LED device which contains the quantum dot-wrapped phase-change paraffin microcapsule comprises LED lamp beads and a colloid fluorescent coating, wherein the colloid fluorescent coating is doped with the quantum dot-wrapped phase-change paraffin microcapsule, and the colloid fluorescent coating coats light-emitting cup openings of the LED lamp beads. According to the invention, paraffin wax in a liquid state is encapsulated through microcapsules, so that the problem of insufficient scattering performance of quantum dots is solved by optimizing scattering; the surface area is increased through microencapsulation, and heat absorption iscarried out by phase change of the paraffin wax, so that the load of heat dissipation of LED is reduced.

A wavelength conversion apparatus contains a semiconductor laser device as an excitation light source, a semiconductor optical amplifying element, a resonator formed by the optical amplifying element and a mirror arranged outside the optical amplifying element, and a wavelength conversion element arranged in the resonator. The semiconductor laser device emits excitation laser light which is supplied to the semiconductor optical amplifying element. The semiconductor optical amplifying element has an active layer on a substrate thereof, and is excited by the excitation laser light to emit laser light. Then, the laser light emitted by the semiconductor optical amplifying element is converted by the wavelength conversion element to reduce the wavelength to half.

The present invention discloses an electromagnetic induction lamp circuit which is connected with power supply and can be used for converting DC input into AC output to drive lamp tube of electromagnetic induction lamp. Said circuit includes the following circuits: boost-up rectification circuit, voltage-stabilizing circuit, oscillating circuit and start-up circuit. Said invention also provides the concrete action of the above-mentioned every circuit. Besides, said invented circuit also has overcurrent and overvoltage protection devices, and said invention can utilize power supply control processor to raise constance of light and service life of light source.

The invention discloses an elevator capable of realizing continuous sterilization. The elevator comprises an elevator body, an elevator handrail and elevator buttons; the surface of the elevator body is coated with a first sterilizing coating; the surface of the elevator handrail is coated with a second sterilizing coating; each elevator button comprises a button shell; the surface of each button shell is coated with a third sterilizing coating; a sensing device, automatic sterilization equipment, a control device and a power supply unit are arranged inside each button shell, wherein each sensing device is used for detecting the number of pressing times that a user presses the corresponding elevator button; each automatic sterilization equipment is used for sterilizing the corresponding elevator button; each control device is used for controlling the corresponding automatic sterilization equipment to work; each power supply unit is used for supplying power to the corresponding automatic sterilization equipment; the automatic sterilization equipment is connected with the control devices and the power supply units; the control devices are connected with the sensing devices; each piece of automatic sterilization equipment comprises an ultraviolet sterilizing lamp. By adopting the elevator disclosed by the invention, different positions of the elevator can be effectively sterilized in a targeted manner; the elevator disclosed by the invention is good in sterilization effect and long in duration time.