33results about How to "Effective control of precision" patented technology

The invention relates to a PCB (printed circuit board) back drilling method. The PCB back drilling method comprises the following steps: fixing a PCB on a machine table, and mounting a drill bit on a drilling machine; selecting a target layer, and determining an actual control depth h1 of the target layer; and determining a back drilling control depth h of the PCB according to the actual control depth h1 of the target layer and a preset safety length M of a stub and controlling the drill bit to drill a hole drilling machine control system. According to the PCB back drilling method, influence of thickness uniformity of the board, cone height of a drill tip and copper / tin-plating process variation on the accuracy of the control depth can be reduced; and through introduction of the safety length M of the stub, the precision of the PCB back drilling control depth h can be effectively controlled, thus achieving precision control of the stub and eliminating adverse effects of the stub on a signal.

The invention relates to a device for additive manufacturing of rigid thermal insulation tile bodies. The device comprises a filter container capable of being operated to move in the horizontal direction, a liquid discharging pipe communicated with a liquid outlet of the liquid collecting part, a feeding system for feeding materials into the filter container as well as a pressurizing device located on one side of the spray head and used for pressurizing materials in the filter container, wherein the filter container comprises a bottom plate comprising openings in the peripheral walls and the middle, a bottom net at the lower part of an inner cavity defined by the peripheral walls, reinforcing ribs for supporting the bottom net and a liquid collecting part below the reinforcing ribs; the feeding system comprises a storage chamber, a feeding pipe, a spray head communicated with an outlet end of the feeding pipe and a perforated plate arranged below the spray head and having a hole array,holes in the hole array are through holes, and the through holes correspond to nozzles of the spray head and are used for supporting and fixing the nozzles; the pressurizing device comprises a pressure head, a pressure arm fixedly connected with the pressure head and a driving device for driving the pressure arm to vertically stretch and retract. The device can manufacture the rigid thermal insulation tile bodies with uniform density and accurate thickness and has the advantages of simple structure, low manufacturing cost and the like.

The invention discloses a method for preparing a force-responsive nanoscale photonic crystal material. Electron beam lithography technology and reactive ion etching technology are used to etch a nanoscale pattern according to pre-designed photonic crystal structure parameters. The rigid template is used as the filling template, the highly elastic gel with excellent mechanical properties is used as the matrix material, and the viscoelastic polymer is used as the filling material. By filling the template, the pre-designed photonic crystal pattern is "transferred" to the viscose In elastic polymers, nanoscale, structure-controllable and force-responsive photonic crystal materials are prepared through steps such as spin coating and stacking. Compared with the prior art, the preparation method of the present invention has the characteristics of simple process, short process, easy control of process parameters, reusable template, high product precision level, stable and reliable quality, and low cost.

The invention discloses a method for preparing a force-responsive photonic crystal material based on reverse imprint nano-molding technology, which uses electron beam lithography technology and reactive ion etching technology to etch according to pre-designed photonic crystal structure parameters A rigid template with a nanoscale pattern is used as a master template to prepare an elastic polymer soft template with an inverse nanoscale pattern, and it is used as a secondary template; high elastic gel is used as a filling material, viscoelastic polymer As a molding material, the pattern on the master template can be "replicated" into the viscoelastic polymer in a "high-fidelity" manner by reverse imprinting; and then a nanoscale, structurally controllable force-responsive Photonic crystals. Compared with the prior art, the preparation method of the present invention has the characteristics of simple process, short process, easy control of process parameters, reusable template, high product precision level, stable and reliable quality, and low cost.