50results about How to "Stable color temperature" patented technology

The invention relates to a multi-light source projecting system and relative light module, wherein the invention comprises: light source, light source controller, color selective dichroic mirror, liquid crystal light valve, light combine element and projection lens; the light source is formed by first and second lighting elements to supply first and second light colors; the light source controller controls the synchronous operations of light source and liquid crystal light valve; the color selective dichroic mirror divides the second color light into third and fourth color lights; the liquid crystal light valve receives the color light independently to transmit them to the light combine element; the light combine element combines the first, third and fourth color lights to be mixed to be projected to the projection lens to form light image. The invention can fully utilize the efficiency of second color light, to make the brightness of first, third and fourth ratio met with the needed final brilliance white light, to improve the light utilization.

The present invention relates to an intelligent high-power LED controller, which comprises a MCU central control unit, a clock circuit, a reset circuit, a controlling keyboard, a status display unit, a fault output and alarm circuit, a LIN bus interface, a photoelectric isolation driving unit and a plurality of LED driving unit. The clock circuit, the reset circuit, the controlling keyboard, the status display unit, the fault output and alarm circuit, the LIN bus interface and the photoelectric isolation driving unit are all mutually connected with the MCU central control unit. The MCU central control unit is mutually connected with the photoelectric isolation driving unit. The photoelectric isolation driving unit is mutually connected with a plurality of LED driving units. The LED driving units are mutually connected with each other and are connected respectively with a high-power LED array. Compared with the prior art, the present invention is characterized by high efficiency and multi-channel.

The invention relates to a LED car lamp control circuit comprising a LED car lamp assembly which includes several LEDs, at least one reflecting unit and at least one heat elimination unit; a driving circuit for controlling the LED to keep a stable brightness, chrominance and color temperature by controlling the input magnitude of the LED driving current; and a temperature sensing circuit for sensing the temperature of a certain measuring point of the LED car lamp assembly, and triggers the driving circuit to execute the action of output driving current magnitude correction by electronic signal as soon as the temperature reaches a preset value. Consequently, the invention can realize the even brightness, stable temperature of the LED, thereby avoids the damage to the LED caused by extra high temperature and avoids the changed brightness, chrominance and color temperature of the LED out of the criterion of relative car lamp controlling laws, consequently, can prolongs the service life of the LED.

The invention relates to the technical field of LED, namely, a structure-improved white light LED. Positive and negative electrodes of a LED wafer are respectively led out by leads and extended to be connected with a leading pin or a frame out of a lens shield which shades the wafer. The invention is characterized in that at least one wafer is fixed on a cup-shaped groove or platform on a base or the frame. The external surface of the wafer is provided with light permeable and heat insulating medium, wherein, the external surface of the medium or the lens shield is coated with a layer of fluorescent powder. The invention has the advantages that the fluorescent powder is separated from the wafer, so as to prevent the fluorescent powder from blackening caused by thermal aging and carbonization, stabilize the color temperature and lighting strength and improve the optical efficiency by 16 to 36 percent. After aging test of 5000 hours, the luminous flux of the product is more than 90 percent of the original luminous flux, so that the invention can be used for producing various lamps such as serial LED lamps, LED signal lamps, LED indicating lamps and LED decorative lamps.

A light emitting system includes a light emitting device having a forward voltage dependent on an ambient parameter, and a power control device including a current generator, a compensation voltage module, and a control signal generator. The current generator converts a control signal into a driving current for provision to the light emitting device, and provides a feedback voltage. The compensation voltage module obtains a compensation voltage according to the forward voltage, the feedback voltage, and a reference voltage. The control signal generator generates the control signal according to the compensation voltage for provision to the current generator.

The invention relates to the field of light sensation device performance testing, in particular to a CCD performance parameter testing device and a testing method. The CCD performance parameter testing device comprises a PC control module, a main integrating sphere, an opaque chamber, a first illuminometer, a three-dimensional loading platform, stabilized power supply and auxiliary integrating spheres which are arranged on an hemisphere, at the side of a light output port, of the main integrating sphere; light sources of the CCD performance parameter testing device are provided by the multiple auxiliary integrating spheres arranged on the main integrating sphere and the light sources have a double-light-mixing effect so that light output by the main integrating sphere can be better in the homogeneity, light output ports of the auxiliary integrating spheres are provided with adjustable light bars so that a testing light source with continuously variable illuminance and a more stable color temperature can be provided; and meanwhile, illuminometers and the method from a CCD to be tested to the light output ports are automatically switched over in an alternating mode so that a measuring result can be more accurate.

The invention discloses a composite ceramic fluophor for high-power laser illumination. The composite ceramic fluophor comprises a ceramic fluophor first layer and a ceramic fluophor second layer, wherein the ceramic fluophor first layer is a complex phase fluophor formed by (CexY<1-x>)3Al5O12 particles and Al2O3 particles through uniform and staggered construction, wherein the mass ratio of the (CexY<1-x>)3Al5O12 particles is 30 to 100 percent, and the mass ratio of the Al2O3 particles is 0 to 70 percent; the ceramic fluophor second layer is a complex phase fluophor formed by (CeyGdzY<1-y-z>)3Al5O12 particles and Al2O3 particles through uniform and staggered construction, wherein the mass ratio of the (CeyGdzY<1-y-z>)3Al5O12 particles is 30 to 100 percent, and the mass ratio of the Al2O3particles is 0 to 70 percent. The composite ceramic fluophor for high-power laser illumination has the advantages that the heat conductivity and the color rendering index are obviously improved; the color temperature is stable; the luminous efficiency is excellent.

The invention provides a PWM-based light adjusting circuit, which comprises a switch element, a PWM signal generator and a constant-current power supply, wherein the switch element is connected with an LED light source; the PWM signal generator is connected with the switch element for adjusting PWM signals to control the switching on and switching off of the switch element; the constant-current power supply is connected with the switch element for outputting an adjustable output current; the constant-current power supply comprises a current reference module, and can adjust the output current to be a reference current Ir; and the current reference module is linked with the PWM signal generator, so that the ration mu of the reference current Ir to a maximum current Imax of the constant-current power supply changes along with the change of the duty ration D of the PWM signals. By adopting the technical scheme, the LED light adjustment can be adjusted at high precision without changing color temperature.

An LED device comprises a substrate, an LED chip and a luminescent conversion layer. The substrate comprises a first electrode, a second electrode and a reflector located on top faces of the first and the second electrodes. The LED chip is disposed on the first electrode and electrically connected to the first and the second electrodes. The luminescent conversion layer is located inside the reflector and comprises a first luminescent conversion layer and a second luminescent conversion layer with different specific gravities. A manufacturing method for the LED device is also provided.

The invention discloses a light-emitting diode packaging structure. The light-emitting diode packaging structure comprises at least one light-emitting diode chip, at least one color sensing component and reflecting cups surrounding the light-emitting diode chip, wherein the light-emitting diode chip is provided with a primary light-emergent surface and a secondary light-emergent surface opposite to the primary light-emergent surface; and the light intensity of light emitted from the secondary light-emergent surface of the light-emitting diode chip is detected by the color sensing component so as to monitor and adjust the color temperature of the light-emitting diode. According to the light-emitting diode, due to the arrangement of the color sensing component, the change of the light intensities of all colors is detected by the color sensing component so as to stabilize the color temperature of the light-emitting diode chip.

The invention discloses a light diffusion layer and a light diffusion sheet. The light diffusion layer contains resin and diffusion particles dispersed in the resin, wherein the proportion of the diffusion particles to the solid content of the resin is 0.05: 1 to 3: 1, and the difference between the refractive index of the diffusion particles and the refractive index of the resin is 0.05-1; the particle size of the diffusion particles is 1-30 microns; the thickness of the light diffusion layer is 20-200 microns. According to the invention, the light diffusion layer and the light diffusion sheet can convert a light source into an ideal Lambert light-emitting body, so that the influence of large-angle incident light on a signal can be effectively inhibited.

The invention discloses a fluorescent powder packaging process of a light-emitting diode, which comprises the steps of producing a transparent optical material lens, and forming at least one fluorescent powder accommodating slot which corresponds to a light-emitting diode chip on one surface of the lens; adjusting the concentration, and attaching fluorescent powder in the fluorescent powder accommodating slot according to the required quantity; and baking for curing the fluorescent powder; filling a gap between the light-emitting diode chip with well wire bonding and the fluorescent powder lens with colloid, and carrying out mutual bonding, thereby completing the fluorescent powder packaging process. The process can effectively and precisely dominate the fluorescent powder, and achieve the advantages of excellent quality stability, color uniformity and the like.

The invention discloses a method and a system for detecting the liquid level of liquid medicine in a complex scene. The method comprises the following steps of: A, setting a light source, a light source illumination direction and an illumination mode; b, setting a camera, a camera lens and camera internal parameters; c, collecting images of the medicine bottle based on the steps A and B; d, labeling the liquid level of the liquid medicine in the collected image of the medicine bottle through an image labeling tool, and taking the labeled data as a data set; e, performing model training on the data set through the yolov5 to obtain a detection model; and F, detecting the liquid level of the liquid medicine in the to-be-detected image by using the detection model to obtain a liquid level detection frame of the liquid level of the liquid medicine, and judging whether the liquid medicine in the medicine bottle in the to-be-detected image is excessive or insufficient and whether the medicine bottle is insufficient according to the liquid level detection frame and the liquid level upper and lower limit values. The invention provides a method for detecting the liquid level of liquid medicine in a complex scene to solve the problem that a traditional image processing method cannot adapt to liquid level detection of the liquid medicine in the complex scene.

The invention relates to a D65 and D75 standard light source and a method for compensating the chrominance drift thereof. The D65 and D75 standard light source comprises at least one LED white-light illuminant and at least one blue-light LED light-emitting element. The light of the LED white-light illuminant and the light of the blue-light LED light-emitting element are mixed to form the D65 and D75 standard light source. Each of the LED white-light illuminant and the blue-light LED light-emitting element is driven by a respective independent power supply. The D65 and D75 standard light source is also provided with color temperature sensors, a comparison circuit, and a power control circuit. The LED white-light illuminant and the blue-light LED light-emitting element are connected with respective color temperature sensors. The color temperature sensors are connected with the comparison circuit. The comparison circuit is further connected with the power control circuit of the blue-light LED light-emitting element. The light-emitting stability of the D65 and D75 standard light source is effectively maintained. During a rated effective service life, the method may effectively compensate the chrominance drift of the D65 and D75 standard light source.

The invention discloses an endoscope color temperature real-time correction method and device, electronic equipment and a camera system, and belongs to the field of endoscopes, and the method comprises the steps: obtaining a corresponding relation between a light source control signal and an image color temperature; acquiring a light source control signal, wherein the light source control signal comes from a light source control unit; generating a color temperature correction coefficient by using a corresponding relation between the light source control signal and the image color temperature according to the light source control signal; correcting the color of the real-time shot image according to the color temperature correction coefficient to obtain a picture signal; sending the picture signal to the display, and using the color temperature correction coefficient for processing the real-time shot image so that even if the brightness of the light source changes greatly, the color temperature output by the display can be kept stable, frequent color tone changing of the image is avoided, an operator can see the biological tissue clearly, and popularization and application of the endoscope with the adjustable light source power are facilitated.

The invention discloses a machine vision LED illuminating apparatus for color discrimination. The illuminating apparatus comprises a dark room, an LED illumination module arranged in the dark room, and an LED driving controller connected with the LED illumination module, wherein the LED illumination module is composed of a plurality of LED chip sets, a metal cooling element and a diffuser plate and emits diffuse reflection white light with uniform illuminance on an observation surface; the driving controller is a control device for adjusting the illuminance of the LED illumination module on the observation surface through a connected circuit according to an operating instruction; the dark room is a relatively closed space device composed of a front baffle, a rear baffle, a left baffle, a right baffle and an upper baffle with the ambient color and a sample supporting plane with the background color, and is provided with a sample channel used for a production line; and the LED illumination module and a vision camera are respectively fixed inside the device through different connecting pieces.

The invention relates to a transparent fluorescent ceramic material and in particular relates to a Ce:YAG based transparent ceramic being used for fluorescence conversion of a white laser diode (hereinafter referred to as LED) and containing Sr and a preparation method thereof. The chemical formula of the transparent ceramic is MgAl<2>O<4>-(Ce<x>Sr<y>Y<1-x-y>)<3>Al<5>O<12>. The transparent ceramic can be directly used as a packaging material to replace traditional organic polymers or silica gel packaging materials, and compared with existing transparent ceramics, has lower and stable color temperature, excellent luminous efficiency, obviously improved color rendering index and quite high stability and optical attenuation resistance; therefore the transparent ceramic has satisfactory service life.

A medical X-ray film viewing lamp box comprises a base and a lamp box body. The lamp box body is vertically arranged on the base through a rotary shaft and comprises a main box body and a substrate. A plurality of film clamps are arranged on the upper portion of the front side of the main box body, an interlayer is arranged in the main box body, and the substrate is placed in the interlayer to divide the main box body into a front box body and a rear box body. The substrate is a touch induction board. LED lamps are arranged in the rear box body, a switch and an adjusting knob are arranged on the side edge of the lamp box body, the adjusting knob adjusts the brightness of the LED lamps, and cooling holes are formed in the left side face and the right side face of the lamp box body respectively. X-ray film can be conveniently clamped on the substrate of the lamp box, insertion piece induction is adopted, the lamp box is lit while the film is inserted, partitions are lit, and the brightness can be adjusted according to needs; convenience is brought to a user by means of the dual-purpose function of a manual switch and the automatic switch, energy conservation and environment protection are achieved, and the service life of the product is greatly prolonged.

The invention provides a homogenized white light source comprising a light source, a homogenizing system, and a fluorescence conversion device, wherein the light source is a spot light source, and used for emitting light beams; the homogenizing system is used for homogenizing the light beams to enable the light beams to form homogenized surface light source; the fluorescence conversion device is used for receiving light beams from the homogenized surface light source to achieve white light output; the homogenizing system is a diffusion piece, diffraction optical element or micro lens array; the fluorescence conversion device is a crystal piece, sintered ceramics or organic film containing a fluorescence conversion material. In the invention, an original light source is changed into the surface light source with uniform energy distribution, the action area of a lighting element containing the fluorescence conversion material is enlarged, and the utilization rate of the original light source is increased; the homogenized surface light source can greatly reduce the power density born by the fluorescence conversion device containing the fluorescence conversion material, so that the long-term stabilization and the reliability of the fluorescence conversion device are improved, the service life of the fluorescence conversion device is prolonged, moreover, outputting white light with controllable and stable color temperature and color rendering indexes can be facilitated.

The invention relates to a transparent fluorescent ceramic material and in particular relates to a Ce:YAG based transparent ceramic being used for fluorescence conversion of a white laser diode (hereinafter referred to as LED) and containing Lu and a preparation method thereof. The chemical formula of the transparent ceramic is MgAl<2>O<4>-(Ce<x>Lu<y>Y<1-x-y>)<3>Al<5>O<12>. The transparent ceramic can be directly used as a packaging material to replace traditional organic polymers or silica gel packaging materials, and compared with existing transparent ceramics, has lower and stable color temperature, excellent luminous efficiency, obviously improved color rendering index and quite high stability and optical attenuation resistance; therefore the transparent ceramic has satisfactory service life.

The invention discloses a microscope lighting system with adjustable color temperature. The system comprises LED light sources, a control circuit and a man-machine interface, wherein the LED light sources are distributed symmetrically or uniformly in space, the control circuit can control the color temperature and luminance of the LED light sources simultaneously, and the control circuit is connected with the man-machine interface and the LED light sources respectively; the control circuit is composed of a color temperature adjustment unit, a luminance adjustment unit, a main control system unit and a color temperature sensor; and the main control system unit controls the luminance of LED chips with different color temperature through an LED light source driving module and adjusts the color temperature and luminance of microscope lighting. Through the microscope lighting system, the color temperature and luminance of white light illuminating a specimen surface can be adjusted accurately and effectively, and therefore a microscope can meet different environment or specimen requirements and achieve a good observation effect; and the microscope lighting system is simple in structure,high in optical utilization rate and more stable in color temperature.

The invention discloses a gold halogen PAR lamp which comprises a lamp cap, a light reflecting lamp cup and a gold halogen lamp, wherein the gold halogen lamp is arranged in a cup body of the light reflecting lamp cup, and the light reflecting lamp cup is an aluminum cup body. The upper part and the lower part of the light reflecting lamp cup are respectively provided with a vent hole. The gold halogen PAR lamp has the advantages of high use safety, stable color temperature, low speed of light attenuation, long service life and the like, and the phenomenon of light reflecting film glass can not occur within the service life.

The invention relates to the technical field of projection, and discloses a projection equipment gamma curve adjusting method and equipment, and the method comprises the steps: obtaining the ambient light data of a current projection scene, and determining a first compensation value according to the ambient light data; obtaining reflecting surface data of the current projection curtain, and determining a second compensation value according to the reflecting surface data; determining a third compensation value according to the ambient light data and the reflecting surface data; identifying an image content type of the current projection according to the input signal, and determining a gamma value according to the image content type; and obtaining a target gamma curve according to the first compensation value, the second compensation value, the third compensation value and the gamma value. The invention provides a systematized and scene-based intelligent gamma curve matching scheme for a user, the optimal display effect can be achieved in different environments, different projection screens, different color temperatures and different projected image types under the condition of not needing complicated operation and mastering professional background knowledge, and the user experience is improved. And the overall visual viewing experience of the user is improved.

The invention relates to a laser light source which comprises a blue laser light source assembly used for generating parallel linear polarization blue laser, a dichroic polarizing beam splitter, a quarter-wave plate, a reflecting piece and a wavelength converter, wherein an angle theta is formed between the polarization direction of the blue laser and the Y axis of an XOY plane; the blue laser is respectively reflected and transmitted by the dichroic polarizing beam splitter to form reflected blue light and transmitted blue light, and the reflected blue light is converged on the wavelength converter to generate excited yellow light; the transmitted blue light is subjected to wavelength conversion by the quarter-wave plate and then is reflected by the reflecting piece to pass through the quarter-wave plate again to be subjected to secondary wavelength conversion to form S polarized blue light, and the S polarized blue light and the excited yellow light are mixed to generate output white light; and the angle theta is set based on a preset light energy ratio of the S polarized blue light to the excited yellow light. The requirements of stable color temperature, simple and convenient manufacturing and energy loss reduction can be met at the same time.

The invention relates to the field of photography, in particular to a balloon lamp. The balloon lamp comprises a 360-dimension cloth lamp shade, a light source of a metal halide lamp and a lamp cap, wherein a reflective layer is coated on the inner wall at the upper part of the cloth lamp shade; the light source is detachably connected to the top end of the lamp cap; and the tail end of the lamp cap is detachably connected to the cloth lamp shade in a sealed manner. The balloon lamp can realize shadowless and omnibearing lighting.