49results 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 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.

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 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 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 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 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.