8results about How to "Small area" patented technology

The utility model discloses an adjustable EMS face massage instrument which comprises an adjustable fixing support and massage bodies, ear hooks are arranged on the two sides of the support respectively, massage bodies are further arranged at the tail portions of the two ends of the support respectively, and adjustable structures are arranged between the support and the massage bodies and between the support and the ear hooks respectively. A controller is arranged on the rear side of the adjustable fixing support, the controller is electrically connected with the massage body, an original existing face massage instrument fixed in a mask mode or a face clamping mode is replaced with a face massage instrument fixed in an ear hanging mode, and meanwhile an adjustable structure is arranged on the adjustable fixing support and the massage body. Secondly, ear hooks are further arranged on the two sides of the adjustable fixing support respectively, the relative positions of the ears and the head are different, the ear hooks are adjusted through an adjustable structure, and the adjustable fixing support can be used for adjusting the position of the massage body relative to the human face and controlling the position of the massage face. The structure of a human body is better met, and fitting is closer.

The invention provides an ultrasonic transducer and ultrasonic cleaning equipment, the ultrasonic transducer comprises a piezoelectric exciter and a vibration radiant panel, the vibration radiant panel is fixed on the piezoelectric exciter, a power supply is electrically connected with the piezoelectric exciter, so that the piezoelectric exciter can generate longitudinal vibration, and the longitudinal vibration of the piezoelectric exciter can excite bending vibration of the vibration radiant panel. The longitudinal vibration sandwich type piezoelectric ultrasonic transducer solves the defects that an existing longitudinal vibration sandwich type piezoelectric ultrasonic transducer is small in radiation area, weak in longitudinal displacement amplitude, long in longitudinal size and the like to a great extent, and has the advantages of being small in space needed by operation, large in sound radiation area and sound radiation power, small in size and the like. The ultrasonic transducer can be widely applied to the application requirements of miniaturization and thinning of the installation space of the ultrasonic transducer. Meanwhile, the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer can be influenced by the length, and / or the width and / or the thickness of the vibration radiant panel, so that the longitudinal bending displacement amplitude conversion ratio of the ultrasonic transducer is further improved through the size of the vibration radiant panel.

The utility model discloses a current compensation circuit and a chip, which are used for compensating the output current of a current type digital-to-analog converter, the current compensation circuit comprises a negative resistance unit connected with the output end of the current type digital-to-analog converter, and the negative resistance unit comprises a detection unit and a compensation unit, the detection unit generates a detection current based on an output voltage of the current-mode digital-to-analog converter. The compensation unit generates, based on the detection current, a compensation current opposite to the detection current in flow direction and for the injection node. According to the current compensation circuit and the chip, the detection unit shunts the output current of the current type digital-to-analog converter, the compensation unit generates the compensation current based on the detection current generated by shunting, the magnitude of the compensation current is adjustable, and the direction of the compensation current is opposite to that of the detection current. The output current of the current type digital-to-analog converter is compensated through the compensation current, so that the precision of the output current of the current type digital-to-analog converter under different loading conditions is improved.

The application relates to a full-solid-waste high-activity composite admixture and a preparation method thereof, raw materials of the full-solid-waste high-activity composite admixture comprising: mixed-milling micro-powder of steel slag tailings and refining slag, and slag micro-powder; wherein the content of the mixed-milling micro-powder is 20-30 parts by weight, and the content of the slag micro-powder is 70-80 parts by weight. Through the synergistic effect of the raw material re-mixing, the activity of the admixture is improved, the stability of the chemical performance index of the admixture is ensured, the use proportion of the admixture in cement and mortar is improved, the consumption of cement is saved, and then the cost is reduced. The metallurgical industrial solid waste such as steel slag tailings, refining slag, blast furnace slag and the like is realized to be resourcefully utilized, and the problem that long-term stacking occupies land and cannot be absorbed is solved.

The utility model discloses a corrosion-resistant refrigerator refrigerating chamber door aluminum alloy handle, and relates to the technical field of handles. The drawer cabinet comprises a drawer cabinet body, a sliding seat, an outer handle, a pull rope, a first guide rod and a second guide rod, the sliding seat is connected to the outer wall of the drawer cabinet body in a sleeved mode, guide rails are arranged on the two sides of the drawer cabinet body, a mounting groove is formed in the sliding seat, a front window is formed in the front end of the sliding seat, and the outer handle is arranged in the front window. A first sliding support and a second sliding support are arranged in the mounting groove, the outer wall of the second guide rod is sleeved with a conical block, pull ropes are arranged in the mounting groove, an inner handle is arranged between the pull ropes, the outer wall of the first guide rod is sleeved with a first supporting ring, and a first spring is arranged between the first supporting ring and the first sliding support; a first hole is formed in the inner wall of the sliding seat, and an assembly block is arranged at an opening of the first hole. According to the utility model, the elastic impact structure is arranged in the sliding seat to impact the frozen part, so that the drawer cabinet is convenient to take out.

The application relates to the field of wireless communication technology and provides a tunable output matching circuit and a power amplifier, which comprises a first capacitor and a first inductor, the first end of the first inductor is used for accessing a radio frequency signal, the second end of the first inductor is connected with the first end of the first capacitor and is used for outputting the radio frequency signal after impedance matching, and the second end of the first capacitor is grounded; the tunable output matching circuit further comprises a first tuning circuit and a second tuning circuit, the first tuning circuit is connected in parallel with the first inductor and is controlled to be conducted or disconnected through a first external logic control circuit connected with the first tuning circuit, and the first tuning circuit is used for realizing impedance matching tuning of the first inductor; the second tuning circuit is connected in parallel with the first capacitor and is controlled to be conducted or disconnected through a second external logic control circuit connected with the second tuning circuit, and the second tuning circuit is used for realizing impedance matching tuning of the first capacitor. The tunable output matching circuit can reduce loss and improve the bandwidth performance of the power amplifier.

The application discloses a band gap reference circuit, a band gap reference generation method and a chip. The band gap reference circuit comprises a first resistor, a first PNP transistor and a second PNP transistor, a first current mirror unit, a first transistor, a second current mirror unit and a reference voltage generation unit. The first current mirror unit outputs a first current and a second current; the first transistor is used for generating a third current; the second current mirror unit proportionally copies the third current to generate a fourth current and a fifth current; and the reference voltage generation unit is used for generating a zero-temperature-coefficient reference voltage. According to the band gap reference circuit, the band gap reference generation method and the chip, NPN transistors are not used, so that a smaller number of masks and a smaller area are required, the application in a large-scale integrated circuit is more favorable, good temperature characteristics are simultaneously achieved, a stable reference voltage is maintained at high temperature, and the application in a high-temperature or high-power module in a system basic chip is suitable.

The application relates to the technical field of ceramic preparation, and provides a preparation method of high-thermal-conductivity aluminum nitride ceramic, which solves the problems of relatively poor thermal conductive performance and bending strength of the aluminum nitride ceramic prepared by the prior art; the method comprises the following preparation steps: 1) raw material preparation; 2) ball milling mixing; 3) preheating reduction; and 4) hot-pressing sintering.