89 results about "Ferroelectret" patented technology

The invention relates to an intelligent artificial hand system which comprises an artificial hand body, a drive motor, a piezoelectric electret, a control terminal and a signal interaction module. The artificial hand body comprises a plurality of finger knuckles controlled by the drive motor. The control terminal controls the artificial hand body to grasp according to a first myoelectric signal. The piezoelectric electret collects a tactile signal and a slip sense signal, the control terminal controls whether the artificial hand body continues grasping or not according to the signals, and the signal interaction module feeds back stimulation to a stump. The signal interaction module also obtains a third myoelectric signal, and the control terminal controls the artificial hand body to grasp further according to the third myoelectric signal. The control terminal also controls the artificial hand body to open according to a second myoelectric signal. The intelligent artificial hand system overcomes the defect that a traditional artificial hand can not feel motion states or motion trends of an object relative to the artificial hand and can not control and adjust grasping strength, and is high in reliability and safety, low in cost and easy to popularize.

The invention discloses a method of manufacturing a closed porous piezoelectret energy harvester based on nanoimprint. Manufacturing and processing of an imprint mold are firstly carried out; preparation of a piezoelectret thin film is then carried out; imprint and demolding are carried out to obtain a porous thin film of the piezoelectret; multiple porous thin films are bonded to form a multilayer closed porous film; corona electret is carried out; and finally, working electrode sputtering at two ends of the multilayer closed porous film is carried out. The closed porous cavity can greatly improve the charge storage intensity and the stability, the multilayer porous structure can improve the electro-mechanical conversion efficiency, and the output of the energy harvester is improved.

The invention relates to double-purpose thin film equipment for sound transmission and extension, comprising a piezoelectric electret thin film and a circuit board assembly; the piezoelectric electret thin film includes a porous polymer thin film, electrodes symmetrically installed at the two sides of the porous polymer thin film, and a thin film connection end electrically connected with the electrodes; positive and negative charges are respectively deposited on the upper and lower surfaces of a hole on the porous polymer thin film; and a first connection end electrically connected with the thin film connection end and a second connection end connected with an external circuit are installed on the circuit board assembly. The positive and negative charges are deposited on the upper and lower surfaces of the hole on the porous polymer thin film so as to form an electric dipole; under the influence of the pressure of sound wave, the thickness of the hole on the piezoelectric film changes, such that the size of the electric dipole in the hole changes, and compensation charges in the electrodes also change; therefore, the voltage between the electrodes changes, namely acoustoelectric conversion is realized by using a piezoelectric effect; and vice versa, the thickness of the piezoelectric film vibrates according to a reciprocal piezoelectric effect, the sound wave is generated, and the electroacoustic conversion is realized.

The invention discloses a piezoelectric electret film key. The piezoelectric electret film key is characterized in that a piezoelectric electret film is adopted as a force sensitive element of the key; a plurality of key areas are arranged on the piezoelectric electret film; the upper surface and the lower surface of the piezoelectric electret film are coated with upper surface electrodes and lower surface electrodes which are vertical to the key areas and are in one-to-one correspondence with the key areas; the outer layers of the upper surface electrodes are covered with one surface layer; the lower surface electrodes are bonded on a key base layer; an upper surface encapsulation layer is arranged between the surface layer and the upper surface electrodes; a lower surface encapsulation layer is arranged between the lower surface electrodes and the base layer; and a shielding layer is arranged between the lower surface encapsulation layer and the base layer. The piezoelectric electret film key is advantageous in high sensitivity and strong stability. The piezoelectric electret film key is flexible and can be bent freely, and can identify key pressing strength and has functions such as sliding control.

The invention relates to a thin film type microphone array, comprising a piezoelectric electret thin film and a circuit board component, wherein the piezoelectric electret thin film is a porous thin polymer film; electrode arrays are correspondingly arranged at two sides of the piezoelectric electret thin film; a microphone circuit as well as a circuit board input end and a circuit board output end electrically connected with the microphone circuit are arranged on the circuit board component; and the circuit board input end is electrically connected with the electrode arrays at two sides of the piezoelectric electret thin film. In the thin film type microphone array, a piezoelectric electret made of the porous thin polymer film is adopted as a microphone unit, thereby combining the advantage of efficient reception of the microphone array with the advantages of lightness, thinness, softness, simple structure, strong reliability, low cost and the like of the polymer piezoelectric electret, therefore, the application range of the microphone array is greatly widened, and the microphone array becomes one of choices for replacing a traditional microphone array in the environment of video conferences, vehicle-mounted audio systems, large-scale meeting houses and the like.