31results about How to "Prevent launch" patented technology

An ultrasound diagnosis apparatus having a transmission circuit which generates a transmission signal is provided. The transmission signal corresponds to a combined waveform of a trapezoidal waveform and an impulse-shaped waveform (impulse portion) . In an example transmission signal, a front slope portion, a flat portion, and a rear slope portion exist in a positive polarity side. The impulse portion has a shape which protrudes from an offset level over a base line into an opposite polarity side. Because the center frequency of the trapezoidal waveform is near the DC component, the trapezoidal waveform can substantially be ignored. The impulse portion has a large amplitude, but because the impulse portion exists over both polarities, there is no need to apply a special high voltage countermeasure for each polarity in designing the transmission circuit. A trapezoidal waveform of an opposite polarity may be added in front of the trapezoidal waveform.

The invention relates to laser light transmission equipment comprising a laser, a power supply, a light path and a laser identification and authentication unit, wherein the laser is respectively connected with the power supply and the light path, is used for outputting a power authentication code to the power supply, and controls the laser light to be output to the light path according to the power supply; the power supply is used for receiving the power authentication code of the laser, authenticates the laser, controls current which is output to the laser, and ensures the laser to transmit laser light; the light path is used for laser transmission in the equipment; and the laser identification and authentication unit is used for receiving the authentication code corresponding to the laser light from the light path, determining that the authentication code is matched with the laser identification and authentication unit and adjusting the current which is output to the laser from the power supply. The invention ensures that the laser can realize high-power output only when the laser is arranged in the equipment matched with the laser and prevents the laser light with high-power output from being transmitted towards open space randomly.

The reflective sunshading and thermal insulating composite film includes transparent film layer and aluminium layers coated to the transparent layer and features that the aluminum layers include one upper aluminium layer near the transparent layer and lower aluminium layer separated from the upper aluminium layer by a mocroporous foamed layer and there is one protecting layer on the other side of the lower aluminium layer. The composite film of the present invention is thin, soft, light tight and water tight and may be wound. It has an infrared reflecting rate of 61-75% and 5000-10000 nm wavelength earth heat reflecting rate of 37-52% and its use can saving power consumption of green house by 45-70%.

The invention relates to wireless communication technologies and multimedia communication technologies, in particular to a wireless mobile communication system effectively applied to an office environment. The wireless mobile communication system can solve the problem that in major hotels, restaurants, commercial buildings, large and medium residential estates, diggings and the like, blind areas exist in terminal wireless communication systems due to channel fading. According to the wireless mobile communication system, the modern electronic technology and advanced communication means are utilized, a low-power and multi-station common wire connecting mode which is the same in sending and receiving frequency and can be used by all stations is ingeniously used, and the blind area problem occurring in interphones in various complex environments is well solved. According to application practices of a plurality of star-grade restaurants, hotels, commercial buildings and residential estates, the effect is good. According to the system, novel auxiliary equipment of the wireless communication system can be developed according to different requirements of clients and a new field is opened for expanding and perfecting an existing wireless communication system.

The invention discloses a protection circuit and a method and device for controlling the same, and aims to prevent voltage disturbance from influencing functions of electronic devices when a battery is put into a battery compartment, and improve the safety performance of the battery. The control circuit comprises a first switch, a second switch, a first resistor and a time delay circuit, wherein when a battery pack enters a working state, the first switch is closed to ensure that a grid electrode of the second switch obtains a critical voltage of a closed state and then enters the closed state after the current output by a cell passes through the time delay circuit and after a preset delay time; an anode of the cell is conducted with an anode of the battery pack, so that the voltage disturbance is prevented from influencing the functions of the electronic devices when a battery is put into a battery compartment; and when the battery pack is not in the working state, the first switch is turned off, the voltage of the grid electrode of the second switch is reduced to the critical voltage when the second switch enters the closed state, then the second switch enters a turned-off state, and the current output by the anode of the cell is turned off, so that the safety performance of the battery when the battery is not put into the battery compartment is improved.

The invention provides an electromagnetic protection device, and the device comprises a protection shell, a protection cover, a protected assembly, a connector and a shielding cover. The protective shell is fixedly connected with the protective cover to form a first space; the protected assembly is located in the first space, and the connector is connected to one end of the protected assembly; theshielding case isolates the protected assembly from the connector; the protective cover is provided with a first protective part close to the shielding cover, the first protective part is provided with at least one groove, and the end, close to the protective cover, of the shielding cover is contained in the first protective part. A second protection part is arranged at the position, close to theshielding cover, of the protection shell and provided with at least one groove, and the end, close to the protection shell, of the shielding cover is contained in the second protection part. According to the technical scheme, the problem of electromagnetic radiation and interference resistance of electronic devices such as electronic devices and PCBs can be effectively solved, and electromagneticprotection is achieved.

The invention relates to a wireless communication system applied to a building blind area environment, so that a problem that a blind area of a wireless communication system of a terminal occurs caused by channel fading in hotels, restaurants, commercial buildings, large-scale and middle-scale residential estates, mine lots or tunnels and the like can be solved. According to the system, the modern electronic technology and the advanced communication means are employed and the small-power, multi-station, receiving-transmitting common-frequency, and all-station normal lead connection way is utilized skillfully, so that a problem of interphone blind area occurrence in various complex environments can be well solved. The application practice of multiple star-grade hotels and restaurants, commercial buildings, and residential estates has demonstrated that the effect of the system is good.