49 results about "Geometric symmetry" patented technology

An integrated MEMS inertial sensor device includes one or more three-axis MEMS inertial sensor devices, such as accelerometers, with dual or single proof mass configurations. These designs can be compact and can decouple the motion of each axis to minimize the measurement errors due to cross-axis sensitivity. Some embodiments include a frame to decouple the motion of two axes and to provide geometric symmetry. Some embodiments also include double-folded springs. In a specific embodiment, the three axes of an integrated MEMS accelerometer device are entirely decoupled. Thus, the actuation of each axis, through a force due to acceleration, has little or substantially no effect on the other axes.

A light emitter drive circuit for an oximeter which utilizes a single inductor for driving multiple light emitters. The inductor is connected to a switching circuit to multiple energy storage circuits, such as capacitors. These are alternately charged up, using the same inductor. Subsequently, the capacitors are alternately discharged for their corresponding light emitters through the same inductor. Also, the magnetic susceptibility of the LED drive circuit is reduced by using magnetic flux canceling in the inductor. In one embodiment, a toroidal inductor is used with geometric symmetry and its magnetic flux. In another embodiment, a dual core closed bobbin shielded inductor is used.

The invention discloses a boron-doped stress bar for manufacturing a polarization-preserving fiber and a manufacturing method for the boron-doped stress bar. The manufacturing method comprises the following steps of: A10, depositing a boron doping area on the inner wall of a quartz liner tube by using a plasma chemistry vapor deposition (PCVD) process to obtain a prefabricated member, namely introducing mixed gas into one end of the quartz liner tube, and discharging the mixed gas through the other end of the quartz liner tube, wherein the mixed gas comprises silicon tetrachloride vapor with the flow of 700-1,900sccm, high-purity oxygen with the flow of 1,600-5,000sccm and boron chloride with the flow of 70-1,100sccm; and A20, performing high temperature collapsar on the deposited prefabricated member into a solid boron-doped stress bar. BCl3 and SiCl4 are used as raw materials, the boron doping area is deposited at high speed and high efficiency by the PCVD process, and the utilization rate of the raw materials and the doping concentration are improved; and moreover, gradient doping is adopted, so that the problem that the boron stress bar is easily broken and twisted in the processing can be solved, the geometric symmetry of the doping area is improved, the probability of panda eye and cladding breakage in the cutting is reduced, and the welding efficiency of the fiber is improved.

A method is disclosed for improving a turbine's thermal response during transient and steady state operating conditions in which the flow of cooling fluid in the turbine's casing is caused to be asymmetrical relative to the horizontal and vertical symmetry planes of the casing so that the turbine's cooling symmetry planes are rotated relative to its geometric symmetry planes and thereby the heat transfer at locations in the casing with increased mass is increased.

The invention discloses a linear coreless winding. A wire of the winding is a strip-shaped copper sheet with the section long edge perpendicular to the movement direction of the linear motor, the strip-shaped copper sheets are concentrically wound to form a coil, and a plurality of coils are arranged adjacent to each other so as to form a linear winding structure; a concentrated winding can be adopted in the structure, and interference-free arrangement of end parts of the coils can be realized; or the coils are obtained through further processing, wherein the end parts of the coils are all located on one side of an effective part, and the coils are called an upper coil (100); the upper coil is overturned by 180 degrees along a geometric symmetry line to obtain lower coils (200, 300); the upper coil (100) and the lower coils (200, 300) are alternately arranged with each other to form the linear winding. The invention further discloses a preparation method of the winding and a linear permanent magnet motor with the winding. According to the linear coreless winding disclosed by the invention, an eddy current path is effectively cut off, the eddy current loss of the winding is inhibited, the copper cross section ratio in the air gap space is obviously improved, the power density of the motor is effectively improved, and the weight of the motor is reduced.

The invention provides a geometric symmetry approximation method of a multi-degree-of-freedom electrostatic suspension system based on iterative adjustment. In the method, horizontally moving-rotatingmulti-degree-of-freedom system is regarded as a plurality of independent translational freedom degrees, and a variable pre-load voltage method is adopted for carrying out sequential and circular iterative adjustment on the symmetry of each degree of freedom. A multi-degree-of-freedom suspension body can be adjusted to the geometric symmetry center of an electrode cage only through limited times of iteration. According to the invention, the influence of coupling force between multiple degrees of freedom can be overcome, and the whole process can be complete automatically. The method can be widely applied to high-precision sensing and ultra-precision vibration reduction control based on electrostatic suspension technology, so that the system has self-calibration and environment-adaptive capacity and the system can be retained at the optimal working point. In this way, precise instruments and the precise equipment can be ensured to play the required performance.

A symmetric differential inductor structure includes first, second, third and fourth spiral conductive wirings disposed in four quadrants of a substrate, respectively. Further, a fifth conductive wiring connects the first and fourth spiral conductive wirings, and a sixth conductive wiring connects the second and third spiral conductive wirings. The first and second spiral conductive wirings are symmetric but not intersected with one another, and the third and fourth spiral conductive wirings are symmetric but not intersected with one another. Therefore, the invention attains full geometric symmetry to avoid using conductive wirings that occupy a large area of the substrate as in the prior art and to thereby increase the product profit and yield.

The invention relates to a branch air supply device and a refrigerator with the branch air supply device. Specifically, the present invention provides a branch air supply device, which includes: a casing having a first half and a second half symmetrical about a geometric symmetry plane, the first half and the second half are both There is at least one air inlet and a plurality of air outlets; the first adjusting member and the second adjusting member arranged symmetrically with respect to the geometric symmetry plane are used to adjust the air outlet area of ​​each air outlet of the first half and the second half respectively ; a motor, the turntable portion of the first adjustment member is installed on the output shaft of the motor; and a transmission mechanism configured to synchronously and reversely transmit the rotational movement of the first adjustment member to the second adjustment member. In addition, the invention also provides a refrigerator with the branch air supply device. Since the turntable part of the first regulating part is installed on the output shaft of the motor, the first regulating part drives the second regulating part to rotate through the transmission mechanism, so that the branch air supply device has a compact structure, a small volume and fewer components.

The invention provides a millimeter-wave circumferential uniform radiation microstrip array antenna, which comprises a ring feeder, multiple array elements and inner feeders, wherein the ring feeder is an outer ring feeder with a circle center; one end of each of the multiple array elements is connected with the outer ring feeder and the other end is toward the circle center of the outer ring feeder; the multiple array elements are uniformly distributed in the circumferential direction; the inner feeders are equal to the array elements in quantity; one end of each inner feeder is connected with a middle point of a ring of connection points of the adjacent array elements and the outer ring feeder, and the other end is connected with the circle center of the outer ring feeder; and a feeding point is arranged at the circle center of the outer ring feeder. Through the design of the inner feeders with geometric symmetry, the feeding point is arranged at the circle center of the outer ring feeder, so that uniform current distribution of four array elements is ensured, current distribution on a non-main feed array antenna is strengthened, the directional radiation characteristic of the antenna is changed and high-gain radiation can be kept in multiple directions.

The invention provides a geometric symmetry approximation method of a multi-degree-of-freedom electrostatic suspension system based on iterative adjustment. In the method, horizontally moving-rotatingmulti-degree-of-freedom system is regarded as a plurality of independent translational freedom degrees, and a variable pre-load voltage method is adopted for carrying out sequential and circular iterative adjustment on the symmetry of each degree of freedom. A multi-degree-of-freedom suspension body can be adjusted to the geometric symmetry center of an electrode cage only through limited times of iteration. According to the invention, the influence of coupling force between multiple degrees of freedom can be overcome, and the whole process can be complete automatically. The method can be widely applied to high-precision sensing and ultra-precision vibration reduction control based on electrostatic suspension technology, so that the system has self-calibration and environment-adaptive capacity and the system can be retained at the optimal working point. In this way, precise instruments and the precise equipment can be ensured to play the required performance.

The invention provides a laparoscope ultrasonic probe sensor for improving the physical positioning accuracy. The laparoscope ultrasonic probe sensor comprises an outer casing and an internal main body structure of the outer casing, wherein the outer surface of the outer casing of the sensor is printed with a position calibration line in the axial direction, and the position calibration line at least comprises the following one position calibration line or the combination of several position calibration lines from a projection point geometric symmetry center projection point calibration line, a sound field focusing plane projection line and a uniform scale calibration line. The invention also provides a corresponding probe. When the technical scheme of the invention is adopted, the problem that the detecting region of the existing laparoscope ultrasonic probe cannot be accurately positioned in a human body is solved.