41results about How to "Good diffraction" patented technology

The light directed from a light source to a concave mirror and the light directed from a display device to an eyepiece optical system are intersected by each other in a layout. This allows the light source, the concave mirror, and the display device to be arranged in compactness adjacent to the eyepiece optical system without increasing the optical power of an illumination optical system. As the result, the apparatus can easily be minimized in the thickness or the overall size. A hologram optical element is provided where the relationship between the wavelength range Δλ1 at half of the diffraction efficiency of each of the three primary colors of the light in the hologram optical element and the wavelength range Δλ2 at half of the intensity of each of the three primary colors of the light emitted from the light source is defined by Δλ1<Δλ2. Accordingly, a component at desired wavelengths of each of the R, G, and B colors of the light emitted from the light source can be diffracted by the action of the hologram optical element and then directed to the pupil of the viewer. This allows the image to be increased in the color reproduction area and improved in the quality regardless of the display device actuated in a time-division mode.

A diffractive optical element has a support and a plurality of diffraction structures. The latter are applied on the support and are binary blazed by being split into substructures so that the aspect ratio of the substructures varies locally within an individual diffraction structure. One or more substructures with a large aspect ratio inside an individual diffraction structure are replaced by at least one substitute structure whose aspect ratio is less than that of the replaced substructures.

An optical arrangement includes a light source which emits coherent light of a wavelength λ, and a diffraction grating which has a multiplicity of diffraction structures which follow one another periodically at the spacing of a grating period d and are arranged along a base surface, the individual diffraction structures respectively having a blaze flank and an antiblaze flank, the blaze flanks being arranged at an angle β and the antiblaze flanks being arranged at an angle α to the base surface, and respectively neighbouring blaze and antiblaze flanks enclosing an apex angle γ, and an incident light beam being arranged at a Littrow angle θL relative to a grating normal of the diffraction grating. The angle β of the blaze flanks to the base surface is selected as a function of the Littrow angle θL such that the diffraction efficiency is at least approximately maximal in one of the largest diffraction orders m, which still fulfils the condition (2((m+1) / m)−1)sin θL≧1, and for at least one polarization direction.

The present invention relates to the optical lens technology field, especially to an optical lens without optical return. The lens is made of the raw materials, parts by weight, consisting of the quartz sand of 52-58 parts, the alum of 4-8 parts, the sodium carbonate of 10-13 parts, the nanometer silicon dioxide of 4-6 parts, the modified graphene of 8-12 parts, the lithium hydrate of 4-6 parts, the hafnium boride of 7.5-8 parts, the potassium chloride of 8-10 parts, the vanadium pentoxide 5-8 parts, the iron carbide of 5-8 parts, the barium silicide of 4-6 parts, the tungsten silicide of 1-2 parts, the cobalt dioxide of 4-5.5 parts and the vitrification fiber of 2.5-3 parts. The lens is good in the diffraction to the ray of light and very low in optical return, is very suitable for the shooting usage in the highlight, and is low in the lens image drifting.

The invention discloses a low-temperature-doped luminescent aluminum nitride thin film and a preparation method thereof. The method comprises the following steps: preparing a mosaic target, and placing the mosaic target on a magnetic filtration electric-arc-plating target; chemically cleaning the surface of a matrix; placing the matrix into an electric-arc ion plating machine, and vacuumizing until the background vacuum degree is less than 3.0*10-3Pa; adding bias voltage of -800V; starting a curved arc magnetic filter and the magnetic filtration electric-arc-plating target to perform argon arc plasma bombardment cleaning on the matrix; maintaining current of a magnetic filtration tube, current of the electric-arc target and duty cycle, regulating and controlling the bias voltage to -100 to -400V, introducing nitrogen, and film-coating for 30-90 minutes; and switching off the magnetic filtration electric-arc-plating target and the curved arc magnetic filter, and then taking out a sample to obtain the doped luminescent aluminum nitride thin film. During the preparation process, the temperature of the sample is not more than 180 DEG C, and diffusion heat treatment is not required after deposition. The invention has simple preparation process and easy operation, and electrical and mechanical automatic control can be used in the film-coating course.

The invention relates to a dual-channel independent control and metering intelligent lamp controller and a control method. The dual-channel independent control and metering intelligent lamp controller includes a central control unit, a communication networking module, a metering module, a drive circuit, and an output module; The metering module collects the voltage, current, power, and power factor parameters of the load connected to the output module, and then sends the measured data to the central control unit, which interacts with the external centralized control platform through the communication networking module; A dual-channel independent control and metering intelligent lighting control method, including networking, status data reporting, executing real-time control instructions from an external centralized control platform, and storing real-time control instructions from an external centralized control platform.

A wireless remote control system of steel supporting axial force automatic control devices comprises central control equipment, the multiple steel supporting axial force automatic control devices and a plurality of terminal devices; the central control equipment comprises a main control computer, a dual-frequency coordinator and a first antenna, wherein the dual-frequency coordinator is connected with the main control computer, the first antenna is connected with a ZigBee antenna connector and a Wifi antenna connector of the dual-frequency coordinator, the multiple terminal devices are arranged on the steel supporting axial force automatic control devices correspondingly and comprise second antennas and dual-frequency communication terminals, the second antennas are connected with ZigBee antenna connectors and Wifi antenna connectors of the dual-frequency communication terminals, and the dual-frequency communication terminal of each terminal device is connected with a PLC control cabinet of the corresponding steel supporting axial force automatic control device, and is wirelessly connected with the dual-frequency coordinator through a ZigBee network or Wifi network; the system is good in property of alloying on a non-line-of-sight surface, small in influence of the exterior environment and long in communication distance.