38results about How to "Good cutoff" patented technology

The invention belongs to the field of image recognition, and particularly relates to a collimating film, an interference-reducing collimating film, a preparation method of the interference-reducing collimating film, an attached collimating film and an image recognition module. In order to solve the problem that two layers of collimating diaphragms in a traditional collimating sheet are difficult to align, the invention provides a collimating film, an interference-reducing collimating film, a preparation method of the interference-reducing collimating film, an attached collimating film and an image recognition module. The collimating film sequentially comprises a collimating lens layer, a flexible substrate layer and a collimating hole layer; the collimating lens layer comprises a micro lens array; the collimating hole layer comprises a shading medium; and the shading medium sequentially comprises a black light-absorbing substance layer, a metal coating and a black light-absorbing substance layer. The interference-reducing collimating film provided by the invention can reduce the light interference phenomenon and improve the image recognition accuracy. The image recognition module provided by the invention is high in recognition accuracy and can be applied to fingerprint unlocking and the like of consumer electronic products such as mobile phones (OLED screens).

The invention discloses a low-flow exhalation cut-off device, which includes a two-position two-way solenoid valve, the two-position two-way solenoid valve is installed on the solenoid valve seat, and the channel port of the two-position two-way solenoid valve is connected to a One end of the connecting tube, the other end of the connecting tube is connected to the exhalation mechanism of the ventilator. The cut-off function of the experimental equipment small animal ventilator in the exhalation circuit is realized through the two-position two-way solenoid valve. The solenoid valve responds quickly and can quickly and efficiently control the positive end-expiratory pressure of the small animal ventilator, and its cut-off performance is excellent. , rapid response and simple structure, which solves the problems of rapid aging of the traditional pinch valve breathing cut-off device, short maintenance cycle and easy damage to the experimental subjects. The device has a long service life and high safety performance, and can be widely used in scientific research Institutions, universities and other biological experiment fields.

The invention belongs to the technical field of heat dissipation and cooling and particularly relates to a CUP water cooling system circulation pump. A pump cover is arranged on a pump body, and inletvalves and outlet valves are arranged on the pump cover and the pump body. The inlet valves and the outlet valves are butterfly valves. Transducers are connected in a pump body cavity through pump cover body tables and sealing rings, and each transducer is composed of an elastic ring and piezoelectric vibrators stuck to the two sides of the elastic ring. Each piezoelectric vibrator is formed by connecting a base plate and piezoelectric pieces in a sticking manner. Upper pump cavities are formed by the transducers and the pump cover, and lower pump cavities are formed by the sealing rings andthe pump body. The upper pump cavities which are connected in parallel are then in parallel connection with the lower pump cavities which are connected in parallel. At least one piezoelectric vibratorcomprises a driver and a sensor. A power source outputs the same direct-current drive voltage signal to all the piezoelectric vibrators and the drivers, a sensing voltage signal generated by the sensor is used for judging the deformation state of the piezoelectric vibrators, when the sensing voltage reaches the extreme value, the power source drives the voltage and the piezoelectric vibrators tochange deformation directions, and therefore reciprocating bending vibration of the piezoelectric vibrators and one-direction flowing of fluids are achieved.

The invention relates to a symmetrical spiral linear valve piezoelectric pump. The symmetrical spiral linear valve piezoelectric pump comprises piezoelectric vibrators (1), pump covers (2), valve seats (3), screws (4), a pump base (6), sealing rings (7), sealing rings (8) and screws (9). The pump covers (2) are arranged on the top of the pump base (6). The valve seats (3) are arranged at the upper end of the pump base (6). Each sealing ring (7) is arranged between the corresponding valve seat (3) and the pump base (6). Each sealing ring (8) is arranged between the corresponding valve seat (3) and the corresponding pump cover (2). The piezoelectric vibrators (1) are arranged on the tops of the valve seats (3), each piezoelectric vibrator (1) is arranged between the corresponding valve seat (3) and the corresponding pump cover (2), and each piezoelectric vibrator (1) is fixedly connected with the corresponding pump cover (2), the corresponding valve seat (3) and the pump base (6) through the corresponding screw (9). A pair of symmetrical spiral linear one-way valves (5) which are mutually inverted is installed at the positions of inlets and outlets of the valve seats (3) through the screws (4). The structure is simple, cost is low, and opening and closing of the piezoelectric pump can be effectively achieved.

The invention belongs to the field of microfluid transmission and control and particularly relates to a double-vibrator self-excited pump. A sensor is mounted in a pump body, upper and lower inlet valve cavities of the pump body and butterfly valves adhered to the valve cavities separately form upper and lower inlet valves while upper and lower outlet valve cavities and butterfly valve adhered tothe valve cavities separately form upper and lower outlet valves, and the butterfly valves are formed by adhering pressure rings, valve blocks and valve seats; pump covers are mounted on the upper andlower sides of the pump body and press and connect vibrators in the upper and lower cavities separately to upper and lower cavities of the pump body through seal rings, the vibrators in the upper andlower cavities are formed by adhering substrates and piezoelectric plates, and the sensor and the vibrators in the upper and lower cavities are connected to a power supply through different guide wire groups; the vibrators in the upper and lower cavities, the seal rings, the upper and lower inlet valves and the upper and lower outlet valves form parallel upper and lower pump cavities; the power supply outputs direct current voltage, and when the fluid pressure reaches an extreme value, the output voltage of the power supply and the transformation directions of the vibrators in the upper and lower cavities are reversed. The double-vibrator self-excited pump has the advantages that excitation frequency is formed automatically according to the change state of the fluid pressure of the pump cavity, and the valve is high in efficiency and high in output ability and control precision.

The invention discloses a night vision compatible filter with high and low temperature resistance and high visible light transmission and a preparation method. The night vision compatible filter has a layered structure and includes a near-infrared absorption layer and an antireflection film layer, and the antireflection film The thickness of the anti-reflection film layer is 40-90 μm, and the thickness of the near-infrared absorption layer is 0.5-1 mm; the preparation method includes the preparation of the near-infrared absorption layer, the preparation of the anti-reflection protective coating and the night vision Compatible with steps such as filter preparation. The night vision compatible filter provided by the invention has excellent high and low temperature resistance performance, and the night vision compatible filter has good cut-off performance for light in the range of 650-900 nm, and its average transmittance is only 0.2%, And the transmittance in the visible light region of 400 to 630 nm is more than 50%. The preparation method provided by the invention has a simple process, and the prepared night vision-compatible optical filter takes into account high and low temperature environment resistance, near-infrared absorption and high visible light transmittance.