36 results about "Flattop" patented technology

A mining screening panel which has a screening surface consisting of spaced stainless steel profiled wires supported on transversely extending spaced rods or bars in which the cross sectional shape ofthe profiled wires is a vertical truncated diamond. The top portion is an inverted wedge with a flat top with depending diverging sides and the bottom portion is a wedge with dependent converging sides with a flat or convex bottom. The widest portion of the vertical diamond constitutes the notional screening surface and defines the size of the screening aperture. The raised top above the notionalscreening surface provides the wire a wear surface above the aperture and this provides the wedge wire and aperture with a longer wear life, thus reducing change out periods and reduction in premature failure of wedge wire, which in turn reduces operating costs.

The invention provides a VCSEL array, a manufacturing method, a flat-top far-field generation method, and an illumination module. Compared with the traditional VCSEL array, a uniform flat-top far-field can be easily realized without installing optical elements such as a diffuser. field, thereby significantly reducing the cost of the array and the corresponding modules while meeting the needs of TOF measurement. At the same time, due to the cancellation of the diffuser, the corresponding parts such as the side wall column and the diffuser cover are also omitted, so that the thickness of the module is significantly reduced, and it has many beneficial effects that are not available in the prior art.

The invention provides a manufacturing method and system of an inverted truncated rectangular pyramid / rectangular pyramid shaped anti-reflection micro-nano structure. The system comprises a femtosecond laser system, a light path transmission system, a rectangular flattop shaping unit and a high-rate focusing microobjective. The method comprises the steps of dividing an inverted truncated rectangular pyramid / rectangular pyramid into n layers according to the optimal manufacturing focus depth of the system, calculating the size of the layer surface of each layer, adjusting the system to enable the focal plane of the system to be located at h / 2 position of the first layer of the inverted truncated rectangular pyramid / rectangular pyramid and conducting processing on the layer through shaping gathered rectangular flattop light; and conducting processing in this way until processing of the nth layer is completed. Through the manufacturing method and system of the inverted truncated rectangular pyramid / rectangular pyramid shaped anti-reflection micro-nano structure, the problems of poor shape control capability and limited processing capability in the prior art are solved; processing is conducted in sequence according to the sizes of the layer surfaces to obtain the anti-reflection micro-nano structure with the micromicron-scale depth, and the anti-reflection rate of the anti-reflection micro-nano structure is improved; processing is conducted through light spot shaping according to the sizes of the layer surfaces, and the shape control capability of anti-reflection micro-nano processing is improved; and processing is conducted from top to bottom, and the processing depth-diameter ratio is larger.

The invention discloses a device for realizing flat top pulsed strong magnetic field, which belongs to the technical field of pulsed strong magnetic field. Including: the main discharge circuit composed of the main power supply, the primary side of the coupling transformer, and the magnet load connected in sequence; the compensation discharge circuit composed of the secondary side of the coupling transformer, the AC compensation power supply, the compensation capacitor, and the magnet load connected in sequence; the resistor and the diode connected in series Finally, the freewheeling circuit of the magnet load formed by connecting in parallel at both ends of the main power supply; among them, the compensation discharge circuit can compensate the fundamental frequency ripple component, high frequency ripple and switching ripple component in the magnetic field, resulting in a high stability flat top pulsed magnetic field. The invention adopts the method of combining passive magnetic flux coupling filtering and active filtering to offset the AC component of the main power supply current, realize a high-stability DC current waveform, and then generate a high-stability flat-top pulse strong magnetic field on the magnet load .

The invention discloses a reflective material mold with a flat-top microprism array and a preparation method thereof. The reflective material mold is formed by a unit flat-top microprism array, and the side surfaces of the unit flat-top microprisms are quadrangular. The present invention uses a V-shaped knife to plan a fine V-shaped groove in the first direction, and then enters the next planing direction to plan a fine V-shaped groove after the first direction is completely planed. The structure has the same unit planar The reflective material mold of the top microprism array; this preparation method not only reduces the number of planing times, improves the mold production efficiency, and reduces the difficulty of planing, but also produces a flat top microprism array reflective material that meets the large-angle incidence and observation conditions. Maintaining the superior characteristics of high retroreflection coefficient helps to improve the visibility of reflective signage in large viewing angle range, especially on high-speed entrance and exit ramps, interchange curve guide roads and other road sections with large visual blind spots, and improves the safe driving factor .

The invention belongs to the technical field of advanced manufacturing, and specifically discloses a double-beam SLM forming method and system that takes both forming efficiency and forming quality into consideration. High-precision forming of parts, using high-power, large-spot laser beam with energy distribution in a ring or flat-top mode to achieve high-efficiency forming of metal parts, so as to achieve high-efficiency and high-quality SLM forming of metal parts. The invention can realize the close metallurgical combination of the high-efficiency forming area and the high-precision forming area, effectively suppress the formation of internal metallurgical defects such as insufficient fusion and large particle inclusions, significantly reduce the residual stress of the forming material, and realize the high efficiency of metal parts. High quality SLM forming.

The invention discloses a construction method for excavating a station structure by first tunneling and then station pipe curtain hole pile method. During construction, four pilot tunnels are respectively arranged on the upper and lower floors, wherein there is a leading pilot tunnel in the upper layer pilot tunnel, and the preceding pilot tunnel is used to excavate the station structure. As the working space for the installation of pipe curtains, there is no pipe curtain support above the first pilot tunnel and the four lower pilot tunnels, and the primary support is provided with a vaulted straight wall structure. The pilot tunnels are used as side piles and central steel pipe columns. Space, after the installation of the pipe curtain is completed, the remaining three upper pilot holes on the upper floor will be excavated with a flat roof and straight wall structure. It is also suitable for the excavation of shallow and deep buried stations, which ensures that the environmental facilities are almost unaffected, and thus saves economic costs. It has strong economic benefits and social value, and can be widely used in similar projects.

The invention relates to a miniature laser capable of outputting uniform polarized light and a preparation method thereof. The laser comprises a P-surface electrode, a P-surface distributed bragg reflector, an N-surface distributed bragg reflector, a substrate layer and an N-surface electrode, wherein metal grating of sub-wavelength is manufactured on the surface of the P-surface distributed braggreflector; the metal grating is connected with the P-surface electrode, and the period of the metal grating is smaller than the wavelength of a vertical cavity surface emitting laser; the surface ofthe substrate layer is a spherical surface; and a DOE layer is etched in one side, towards the N-surface electrode, of the substrate layer. According to the laser, a beam shaping system is not needed,and the flat top polarized light can be output by only needing process design and the using the device characteristics; and in addition, the laser has the advantages of simple structure, small and compact size, low manufacturing cost, and can be highly integrated in some equipment, and has very important application prospect.

The invention provides a femtosecond laser processing device and method for nozzle tangential hole, which relates to the field of laser precision processing. Computer, CNC three-axis motion platform, vacuuming device, fixture, filter system, sealing tube, pressure gauge and vacuum pump; the principle of this technical solution is to use circularly polarized femtosecond laser with flat top light distribution to make nozzle tangential holes The uniform and precise processing of the machine is achieved through the protective block in the fixture to achieve back injury protection at the exit of the tangential hole. The negative pressure generated by the vacuum pump can not only monitor the breakdown of the hole, but also avoid the generated plasma to the laser. shielding. The invention can effectively improve the machining accuracy of the current nozzle tangential hole, avoid the defects of recast layer and thermal influence, and propose a solution for back injury protection, which is helpful to improve the liquid flow performance of the nozzle product.

An improved flat-top self-convolution window-weighted power harmonic amplitude estimation method. The FDMS-4FT window is selected as the parent window for time-domain self-convolution to obtain a new flat-top window function; compared with the traditional classic flat-top window function, the flat-top window has lower side lobe peak levels and faster Sidelobe decay rate. In order to make the new flat-top self-convolution window have a flatter main lobe while having excellent side lobe performance, the coefficients of the flat-top self-convolution window are optimized so that it has a flatter main lobe than the parent window. flap, thereby improving the accuracy of power harmonic amplitude estimation. When this window function is applied to the harmonic amplitude estimation of power system, it is not affected by fundamental frequency fluctuations, etc., and there is no need to correct the harmonic amplitude calculation results, and the amplitude measurement results can be obtained directly, with a small amount of calculation, and With high accuracy.

The invention discloses a method and a device for forming and assembling a microscale part, and is applied to the forming and the assembly of micro-precision parts such as integrated circuits and microelectronic products. According to the method, flat top type strong pulse laser illuminates on a restraint layer to form pressure wave to impact a target and make the target locally and rapidly expanded; a micro-blanking material flying at a high speed is obtained under the action of a cutting mould; the micro-blanking material flies at a high speed and then hits against a part to be assembled, so the surface appearance of the part to be assembled is copied and microscale forming is formed; and the speed of the formed microscale part is reduced to zero, the formed microscale part is attached onto the upper surface of the part and then assembled, and the positioning and the installation of the microscale part are performed, so the integration of the forming and the assembly of the microscale part is realized. By the method, the forming and the assembly of the microscale part can be realized simultaneously; therefore, the method is a modern micro-device making method which integrates the processing and the assembly of the microscale part, and has the processing characteristics of high flexibility and high efficiency. Moreover, rapid industrialized production in a large scale is easyto realize.