40results about How to "Improve filtering ability" patented technology

A camera filter automatic switching device comprises a box installed on a camera; the box is provided with a lens opening which is corresponding to the lens of the camera; an installing frame which can slide directionally is installed on the lens opening; two parallel filters are fixed on the installing frame; a drive component which drives the installing frame to move is fixed in the box; wherein, the drive component comprises a micro-motor and an reduction gear set which rotate synchronously with the output shaft of the micro-motor; and a rack which is meshed with the reduction gear set is installed on a fixing frame. Simultaneously, the two ends of the box on which the installing frames are installed are provided with buffer components which prevent the installing frames from being rigidly collided with the inner wall of the box when sliding to a limit position. The invention has the advantages of compact structure, small size, high reliability, easy installation, simple use and control, good filtering effect, strong universality, and the like. With the ordinary micro-motor and a precision drive mechanism, the camera filter automatic switching device is not only provided with the advantages of the existing products, but also avoids the original shortcomings, thereby being more capable of meeting the market demand.

The invention discloses a high attenuation microminiaturte common mode transmission electromagnetic interference active filter, which includes ring high-frequency current-transformer, wherein three windings twine round the mutual-inductor; the coiling directions of three windings are the same; two windings connect the alternating current power lead-in end; another end connects the carry-in terminal of operational amplifier; the export of operational amplifier feedbacks signal to noise source device by two high-pressure capacitances and electric resistances. The filter has simple and reasonable structure, which has strong noise attenuation ability and good low-frequency filtering feature.

The invention belongs to the field of hole machining, and particularly relates to a coupling hole precision machining method. The method includes clamping a workpiece on a rotary workbench of a five-coordinate numerical-control drilling machine, machining a first hole of coupling holes in a numerical-control manner, detecting the actual internal contour of the first hole in a layered manner through a contact probe, calculating the actual axis of the first hole by the least square method, reversely calculating the drilling point coordinate of a second hole according to the design parameter requirements of colliding points, regenerating the numerical-control machining program of the second hole, and machining the second hole automatically. According to the method, on the basis of an integral strategy of measurement and processing, contour measurement, data processing and hole machining of the coupling holes can be completed by clamping the workpiece once, the machining requirements for colliding precision of coupling holes with different diameters and inclined angles can be met, machining efficiency is high, precision consistence is high, 'zeroing' processing of machining errors is performed on the colliding points, and coupling hole precision machining is realized.

The invention discloses an atomic current sensor, which belongs to the field of electronics. The atomic current sensor comprises a light source control circuit, a light source, an atom absorption foam assembly and a sensor signal processing circuit, wherein the light source is controlled by using the light source control circuit; the atom absorption foam assembly is used for receiving an optical signal transmitted by the light source; and the sensor signal processing circuit interacts with the atom absorption foam assembly. Through the setting, the defect that an electromagnetic sensor applied in the fields of engineering detection of high-accuracy current detection, current metering detection and the like cannot well met requirements is overcome; and the atomic current sensor is simple in structure, has high measuring accuracy, and is suitable for popularizing and using.

The invention discloses a second-order active filter circuit, which includes operational amplifiers, variable capacitors, capacitors, resistors and diodes. The invention uses band-stop filtering to suppress or attenuate signals in a certain frequency band, allowing All signals pass through, with strong anti-interference characteristics, simple circuit structure, good stability, and strong filtering ability.

Disclosed is a filter which is arranged on a substrate; the filter comprises a first part, a second part, a first coupling part and a second coupling part, wherein first part is used for feeding a signal; the second part is used for outputting a signal; the first part is not electrically connected with the second part through a conductor; a surrounding space is defined by the first part and the second part; the first coupling part is arranged in the surrounding space; the first coupling part is not electrically connected with the first part and the second part through a conductor, and is usedfor coupling a feed-in signal; and the second coupling part is arranged in the surrounding space, and the second coupling part is not electrically connected with the first part, the second part and the first coupling part through a conductor, and is used for coupling a feed-in signal. The filter provided by the invention is very small in size, and shows strong filtering efficiency in a limited space; and by virtue of the filter, noise interference in a frequency band is lowered, and design of thin and short products is facilitated.

A filter is arranged on a substrate and comprises a first part, a second part, a grounding part, a first coupling part and a second coupling part. The first part is arranged on the first layer of thesubstrate and used for feeding in a signal; the second part is arranged on the first layer and used for outputting the signal; the grounding part is arranged on the second layer of the substrate; thefirst coupling part is arranged on the first layer, electrically connected with the first part and the second part and connected with the grounding part through a through hole; and the second couplingpart is arranged on the first layer, electrically connected with the first part and the second part and connected with the grounding part through a through hole. According to the filter, the size isvery small, the powerful filtering efficiency is shown in a limited space, and not only is noise interference in the frequency band reduced, but also the light, thin, short and small product design can be achieved.

The invention discloses an LCL filter with coupled inductors and belongs to the field of design of power electronic devices. The input end of an alternating-current voltage side inductor of the filter is connected with an alternating-current voltage source, a counteracting inductor is connected with the output end of the alternating-current voltage side inductor in parallel after being connected with a filtering capacitor in series, a damping resistor can be connected with the filter capacitor in series or in parallel, or the damping resistor can be not adopted, the alternating-current voltage side filtering inductor and a rectification or inversion side filtering inductor are coupled and connected in series in the forward direction, and the output end of the rectification or inversion side filtering inductor is connected with a middle point of a rectification or inversion bridge arm. According to the LCL filter with the coupled inductors, not only can the size of the filter be reduced, but also the filtering effect can be improved.