33 results about "Rotation symmetry" patented technology

To provide a workpiece holder capable of measuring a position and a direction of a held workpiece.SOLUTION: A workpiece holder (3) couples a workpiece (2) provided with reference surfaces (30) to a machining device for manufacturing a rotational-symmetrical tool having at least one geometrically defined cutting edge. The workpiece holder (3) comprises: a machining portion part configured to be connectable to the machining device in a releasable rotationally fixed manner; and a clamping portion configured to receive and clamp the workpiece (2) in a releasable manner. The clamping portion of the workpiece holder (3) comprises at least one slot (40) provided at a circumference thereof and configured to provide access to the reference surfaces (30) of the clamped workpiece (2) through the slot (40).SELECTED DRAWING: Figure 4

One aspect of the present invention is a reflector antenna provided with: a rotationally symmetric secondary reflecting mirror that is a secondary reflecting mirror having a shape (360 / n)-degree rotationally symmetric with respect to a prescribed axis serving as an axis of rotational symmetry, the prescribed axis being an axis that is prescribed; and a rotationally symmetric primary reflecting mirror that is a primary reflecting mirror having a shape (360 / m)-degree rotationally symmetric with respect to the prescribed axis serving as an axis of rotational symmetry. As compared with a reference reflector antenna, which is a reflector antenna provided with: a reference secondary reflecting mirror that is a secondary reflecting mirror having a cross-sectional shape coinciding with or substantially coinciding with a quadratic curve; and a reference primary reflecting mirror that is a primary reflecting mirror having a cross-sectional shape coinciding with or substantially coinciding with a quadratic curve, the rotationally symmetric secondary reflecting mirror has a shape obtained by rotating a part of the cross-sectional shape of the reference secondary reflecting mirror n times by (360 / n) degrees each time with respect to the prescribed axis serving as an axis of rotational symmetry, and the rotationally symmetric primary reflecting mirror has a shape obtained by rotating a part of the cross-sectional shape of the reference primary reflecting mirror m times by (360 / m) degrees each time with respect to the prescribed axis serving as an axis of rotational symmetry.

The present invention relates to a container (1) provided with a body (5) and a bottom (6), wherein the body (5) comprises a shoulder (4) and a neck (2), and the bottom (6) comprises at least one peripheral heel (7) defining a base (8), and a push-up (10); the container is characterized in that the bottom (6) comprises at least one central pin (12) having a side wall having a frustoconical overall shape that is rotationally symmetrical about the longitudinal axis X of the container (1) and the concavity of which is oriented toward the base (8), the push-up (10) extending from the central pin (12) to the heel (7) and having a height of between 11% and 18% of the base diameter ΦA, and the central pin (12) having a diameter of between 15% and 25% of the base diameter ΦA and extending above the push-up (10) by a height of between 9% and 18% of the base diameter ΦA.

A stereostructure spacecraft of the present invention comprises multiple deployable beam members, multiple tension members, and a spacecraft for storing the deployable beam members and the tension members. The stereostructure spacecraft is formed by deploying the deployable beam members and the tension members around the spacecraft. The deployable beam members stored in the spacecraft are deployed and arranged equidistantly in directions of multiple rotational symmetry axes, the rotational symmetry axes being rotational symmetry axes of a virtual polyhedron that is formed to have a substantial center of the spacecraft as an origin. The tension members support two end portions of two adjacent deployable beam members with tension. The respective end portions of the deployable beam members are simultaneously supported by three or more of the tension members.

The present invention relates to a tool blade (14) having a structure (24) comprising at least two elements (22) on at least one side (26) of the tool blade (14), wherein the structure (24), together with its elements, is rotationally symmetric with respect to a rotation angle of less than 360°, particularly 180° at most, about the central blade rotation axis (R) of the tool blade (14), but is not mirror-symmetric with respect to any diameter of the tool blade (14) extending through the blade rotation axis (R). The present invention also relates to a tool mounting section (12), a tool blade system (15), and a power tool (10). The tool enables particularly safe operation.

The invention relates to a guide cage (40) intended to be positioned at least partially between two rings, one of which is a rotating ring rotatable relative to the other ring about an axis of rotation, the two rings forming two opposing contact tracks, each of which is rotationally symmetrical about the axis of rotation. The guide cage (40) comprises an annular body (62) forming at least one unit (66) intended to receive a rolling contact body (35), the guide cage (40) being characterised in that it comprises at least one movable centrifugal disengagement device (68), which is movable under the action of centrifugal force between a coupled position and an uncoupled position, in which the centrifugal disengagement device (68) is coupled to the annular body (62), and in which the centrifugal disengagement device (68) is uncoupled from the annular body (62). The coupling position is intended to be in frictional contact with the rotating ring below an angular velocity threshold of the guide cage about the reference axis, and the uncoupling position is not in contact with the two rings above a disengagement angular velocity threshold.

The invention provides a mask group plate for an ion implantation process and a use method. The mask group plate comprises a zero-layer mask plate and at least one current mask plate, at least one first overlay mark is arranged on the zero-layer mask plate, and the first overlay mark is of a first rotational symmetry structure with a first symmetry center; at least one second overlay mark is arranged at the position, corresponding to the at least one first overlay mark, of the current mask plate, and the second overlay mark is of a second rotational symmetry structure with a second symmetry center; the second symmetric center coincides with the first symmetric center, the rotational symmetry of the first rotational symmetric structure is the same as that of the second rotational symmetric structure, and the angular displacement of the second overlay mark and the first overlay mark is zero.

Disclosed is a forced external circulation compression or expansion device intended for pseudo-isothermal transformations. The invention relates to a device that reduces the increases or decreases in temperature of the fluids (3) during these thermodynamic transformations. It consists of a fluid-tight cylinder (1), a mobile piston (2), of elongate shape free of rotational symmetries, performing the compression or expansion, a gaseous or supercritical fluid (3) undergoing this transformation, and two orifices, namely one (11) for discharging and one (10) for admitting the fluid (3). Outside the cylinder (1), the device includes a heat exchanger (4), pipes (6) and a fan (5). In the case of liquid piston, a pump or a hydraulic expander (8) ensures the displacement of the hydraulic liquid (9) via a hydraulic orifice (14). The device may include mobile, fluid-impermeable physical partitions (4), and external thermal reserves (7). The device improves the thermodynamic performance of compressors, heat pumps, ORCs, energy storage and liquefaction units.

According to the storage tank structure optimization design method and system based on the rotational symmetry model, the mechanical characteristic that the storage tank structure is rotationally symmetrical in the circumferential direction is utilized, the local model of the storage tank is established, and the speed of solving the bearing capacity through finite elements is greatly increased. On the basis, by building a storage tank structure parameter optimization process of parametric modeling, calculation, result extraction and parameter optimization, the storage tank design efficiency is greatly improved, the period of one to two months required by a traditional storage tank design method is shortened to one to two days, a fundamental breakthrough of obtaining an excellent design scheme within extremely short time is achieved, and the method is suitable for large-scale popularization and application. The method has great value for improving the rapid research and development and advanced manufacturing capability of aerospace equipment.

The invention relates to a three-blade dry type cutting curved surface machining numerical control cutter which comprises a cutter body (1) which is of a three-blade rotational symmetry structure, and is characterized in that a central air duct (9) is arranged in the center of the cutter body (1); each blade structurally comprises a chip groove (6), a blade mounting groove (7) and a semispherical cutter (5), each chip groove (6) is a groove and consists of two surfaces which are perpendicular to each other and are perpendicularly cut from the end surface of the cutter body (1), one surface is a first plane (61) perpendicular to the end surface of the cutter body (1), and the extension surface of the first plane (61) passes through the central axis of the rotational symmetry structure; the device is simple in structure and suitable for machining of curved surfaces with different curvatures, auxiliary heat dissipation of a gas medium and downward collection of cuttings can be achieved, and vibration and deformation in the machining process are reduced.

The invention relates to a roller bearing with a cage (10) which has at least one pocket (12) in which a roller (14) of the roller bearing is received and which is bounded by an axial end surface (16) that is a surface of the cage (10) and which, during operation, is in contact with a first end face (18) of the roller (14), wherein the axial end surface (16) has at least one first recess (20). It is proposed that the first recess (20), viewed from at least one point on a surface of the recess, is at least partially unbounded in a first direction (28) which is perpendicular to an axis of rotational symmetry (30) of a running surface (32) of the roller (14) and which intersects an axis about which an inner ring (34) of the roller bearing and an outer ring of the roller bearing are rotatably mounted relative to each other.

The application discloses a workpiece, and relates to the technical field of optics. In the application, the workpiece is a mask or a wafer, the workpiece has a functional area and an alignment area on a measurement plane, the alignment area is arranged around the functional area, the workpiece has a rotationally symmetric center, the alignment area has a plurality of alignment marks, one of any two alignment marks can be rotated around the rotationally symmetric center to a position coinciding with the other, and the alignment mark comprises two symmetrical sub-patterns and an asymmetrical sub-pattern arranged on the measurement plane. Each symmetrical sub-pattern has a first symmetry axis and a second symmetry axis perpendicular to each other. The asymmetrical sub-pattern is configured as a pattern asymmetric about the first symmetry axis and the second symmetry axis. The workpiece in the application has the alignment mark, so that a photolithography device can simultaneously realize direction identification and high-precision measurement, and the reliability of an alignment process is remarkably improved.

A boring head (1) comprises: a tool body (10) that has an axial core (X) and that can be mounted such that the axial core (X) is coaxial with the rotation axis of a main spindle of a machine tool; a synchronization member (40) that is accommodated in the tool body (10) so as to be rotatable; and a plurality of cartridges (20) that are attached to an end surface (14a) of the tool body (10) on the side where the synchronization member (40) is accommodated, so as to be movable in a direction perpendicular to the axial core (X), and that can hold a cutting blade (30). The plurality of cartridges (20) have, on the bottom surface thereof positioned on the side facing the tool body (10), a plurality of engagement grooves (26) formed in a direction perpendicular to the movement direction of the cartridges (20). The synchronization member (40) has a plurality of columnar engagement pins (46) engaged with the plurality of engagement grooves (26), and each of the plurality of engagement pins (46) is disposed at a position rotationally symmetric with respect to the axial core (X).

The utility model provides a mark for surgical navigation, and relates to the field of surgical navigation tools. Comprising a mark body, a first mark point and a second mark point which are arranged at an interval are arranged on the upper surface of the mark body, the first mark point is of an asymmetric structure, and the second mark point and the first mark point are of a non-rotational symmetry structure; when a plurality of mark bodies are used, the relative distance between the first mark point and the second mark point on each mark body is different. By setting the directions and the distances between the first mark points and the second mark points on different mark bodies to be different, different mark bodies can be quickly identified and positioned during image scanning, the different mark bodies do not need to be numbered in advance, registration and positioning can be quickly performed, and the lost mark body can be found.

The invention provides an aspheric system error calibration method and device, and relates to the technical field of aspheric system error calibration, and the method comprises the steps: obtaining an alignment error; acquiring a rotational symmetry part of the measured aspheric surface at the first wavefront of the original measurement position and a rotational symmetry part of the measured aspheric surface at the second wavefront after the measured aspheric surface is translated by the preset distance along the optical axis; calculating an error surface according to the rotational symmetry part of the first wavefront, the rotational symmetry part of the second wavefront and the alignment error; fitting the error surface with a pre-constructed rotational symmetry error base, and solving a coefficient of each rotational symmetry error term; according to the coefficient and the rotational symmetry error substrate, reconstructing a rotational symmetry surface shape component of the measured aspheric surface; obtaining a rotational symmetry part of a system error according to the difference between the rotational symmetry part of the first wavefront and the reconstructed rotational symmetry surface shape component; according to the invention, the calibration process is obviously simplified, the measurement time is shortened, and the calibration efficiency is improved.

The invention discloses an asymmetric double-screw rotor molded line, and relates to the technical field of computer-aided geometric design and double-screw rotor molded line design. Each basic unit comprises a half section of driving screw root circular arc, a section of Bezier curve, a section of epicycloid and a half section of driving screw addendum circular arc which are sequentially connected end to end in the clockwise direction, and after the basic units are subjected to symmetry and central symmetry, a driving screw rotor molded line is formed; the driven screw rotor profile is in a rotational symmetry graph, each basic unit comprises a half-section driven screw root circular arc, a section of line segment, a section of long-amplitude epicycloid, a section of optimized circular arc and a half-section driven screw addendum circular arc which are sequentially connected end to end in the clockwise direction, and the driven screw rotor profile is formed after the basic units are symmetrical and rotated. The invention provides a novel asymmetric double-screw rotor molded line which supports adjustment of tooth gaps and adjustment of sharp corner optimization.

The present disclosure provides a high-order rotational symmetry unit-based nonlinear geometric phase metasurface, which sequentially comprises from the bottom to the top: a substrate (1); a nonlinear material layer (2); and a metasurface structure layer (3), comprising multiple super-configuration units (4) having local high-order rotational symmetry, wherein the super-configuration units (4) are periodically arranged to form a lattice structure which has global high-order rotational symmetry. Under the pumping of fundamental waves in a circular polarization state, the nonlinear geometric phase metasurface can simultaneously generate nonlinear harmonic waves having the same and opposite circular polarization states as the fundamental waves, and a nonlinear geometric phase of the generated nonlinear harmonic waves is regulated and controlled by a local rotational symmetry order and lattice structure of the super-configuration units.

The foldable prism structure comprises an upper bottom surface and a lower bottom surface, and the upper bottom surface and the lower bottom surface are both regular polygons with the number of edges larger than or equal to 3. Each edge of the upper bottom surface is rotatably connected with a folding and unfolding module to form a folding and unfolding unit, the folding and unfolding modules are the same in structure, each folding and unfolding module is sequentially composed of a first surface, a second surface and a third surface, and the first surface and the second surface are two congruent right triangle surfaces; the third face is a rectangular face, and any two adjacent edges of the third face are equal to the right-angle edges of the right triangle face. The first face and the second face are hinged through a rotating pair, and the second face and the third face are hinged through a rotating pair. Each edge of the lower bottom surface is rotatably connected with a folding and unfolding unit; every two adjacent folding and unfolding modules are mutually connected through a revolute pair formed by the edge, not forming the revolute pair with the upper bottom face, of the first face of one folding and unfolding module and the adjacent edge of the third face of the adjacent folding and unfolding module. And the plurality of folding and unfolding modules are rotationally and symmetrically distributed relative to the central axis of the foldable and unfolding prism structure in space.

The invention discloses an octagonal-cell composite truss weight reduction structure based on a symmetric group theory, which comprises a structural unit cell, the structural unit cell is composed of a first sub unit cell, a second sub unit cell, a third sub unit cell and an outer stand column, the first sub unit cell is formed by combining secondary sub unit cells through secondary inversion operation, and in addition, the second sub unit cell is formed by combining secondary sub unit cells through secondary inversion operation. Rod pieces in conventional units in the structural unit cells meet the symmetry of points described by a space point group 8mm, the conventional units are formed by basic symmetric units through set mirror symmetry operation, a z axis is set as a rotating axis in an xyz three-dimensional coordinate system, and each sub unit cell is obtained by completing rotational symmetry operation around a center O by an asymmetric line segment. According to the invention, through mathematical symmetry driving, triple performance indexes of light weight, high strength and high energy absorption are realized, and the method can be applied to the fields of transmission towers, aerospace, high-end equipment and the like.

The utility model discloses a multi-section type coal dropping pipe which comprises a discharging pipe, the discharging pipe comprises a feeding port located at the upper end and a discharging port located at the lower end, the feeding port is used for receiving distributed materials, and the materials flow through the discharging pipe and are discharged through the discharging port; the discharging pipe comprises a plurality of pipe sections, the pipe sections comprise at least one rotationally symmetrical pipe section, the rotationally symmetrical pipe section is detachably connected with the adjacent pipe section, and the circumferential installation position of the rotationally symmetrical pipe section can be adjusted in the circumferential direction. The non-worn inner wall of the rotationally symmetrical pipe section occupies the position of the inner wall which is worn after being used for a period of time.

The utility model relates to a support (1) for rolling a metal rod, a metal wire or a metal pipe along a rolling axis (19), which comprises a support shell (10), the outer part (12) of the support shell comprises at least six side surfaces (14.1-14.6) which are equal in length and are arranged in a rotational symmetry mode around the rolling axis when viewed along the rolling axis (19), the two side surfaces (14.1, 14.4, 14.2, 14.5, 14.3, 14.6) form a pair of side surfaces (14.1 to 14.6) positioned parallel to each other; and three rollers (20.1 to 20.3), which are positioned in each case on a roller axis, surround the rolling axis in a star-shaped manner and together form an aperture (21). The three roller shafts are mounted in the bearing bores of the carrier housing by means of eccentric bushings such that the radial spacing of the rollers (20.1 to 20.3) from the rolling axis is adjustable.

A technique for determining an angular orientation between a non-rotationally symmetric working end of a first part of a tool and a tool tracker carried by a second part of the tool is described. The first tool part is configured to be fixed to the second tool part in one of multiple angular orientations and comprises a reference structure. The reference structure is traceable by a tracked pointer and has a predefined angular relation to the working end. A method implementation of the technique comprises receiving first position data indicative of one or more positions of the tool tracker, receiving second position data indicative of pointer positions while the pointer is tracing the reference structure, and determining, based on the received first and second position data and the predefined angular relation between the reference structure and the working end, the angular orientation of the working end relative to the tool tracker.

A method of manufacturing an optical system (100) for a lithographic apparatus (1), the optical system comprising an optical component (102) having a substrate (104) cut from an original block (200), the method comprises the steps of: a) providing (S2) a distribution function (g) of zero-crossing temperatures (ZCTR) of the coefficient of thermal expansion ([alpha] R) of the original block as a function of the position (p) of the original block, the distribution function corresponding to a pattern (218) of rotational symmetry of the zero-crossing temperatures with respect to the axis of symmetry (A) of the original block, b) determining (S3), in a computer-implemented manner, an aberration (Fi) of the optical system for the provided distribution function and for each of a plurality of positions (Pi) of a cutout region (D) of the original block, which positions differ from one another, the plurality of positions of the cutout region differing from one another with respect to a radial position (ri) and / or a height position (hi) of the original block, and c) determining (S4), from the plurality of positions (Pi), at least one selected position (Pa) of the cutout region (D) as a position at which the determined aberration (Fi) is less than a predetermined threshold value (SW).

The utility model discloses an electric connection terminal of a lamp. The electric connection terminal comprises a conductive plate and a conductive terminal. Guide blocks are symmetrically arranged at the two ends of the current-conducting plate respectively, and the guide blocks at the two ends are rotationally and symmetrically arranged. And the conductive terminals are rotationally and symmetrically arranged at the two ends of the conductive plate and are limited on the conductive plate through the guide blocks. According to the electric connection terminal of the lamp, through cooperation of the conductive plate and the conductive terminal, connection of wires in two directions is achieved, connection can be completed in a plug-in mode, the workload is reduced, the operation difficulty is lowered, the wiring efficiency of series connection between lamp bodies is improved, and the stability is improved.

The present invention relates to a system for repairing biological tissues comprising a coupling device comprising at least a first element couplable to a second element, the system further comprising at least two insertion elements each comprising a proximal end connected or connectable to either said first element or said second element of the coupling device, and a pointed distal end, wherein said at least two insertion elements, when in operational configuration, are arranged with a 180° rotational symmetry, and wherein, when the first element is coupled with the second element, the coupling device is adapted to ensure a stable but reversible connection between said at least two insertion elements.

1. The name of the design product: hot chocolate machine stirrer with stirring basket. 2. The use of the design product: for stirring chocolate. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view. 5. The bottom of the design product is not easy to see or not visible during use, omit the top view; the components of the product are rotationally symmetric structure, omit the rear view, left view.

1. The name of the design product: vacuum cover. 2. The use of the design product: the design product is a device for vacuum packaging, specifically used as a cover inserted into a container to achieve a vacuum degree for preserving food and beverages. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1. 5. The design product contains rotational symmetry structure, the design points in rear view, left view, right view have been shown in other views, omit rear view, left view, right view.