156 results about "Rotation symmetry" patented technology

A cutting insert for retention in a rotating cutting tool having an axis of rotation has two opposing end surfaces and a peripheral surface extending therebetween, each end surface having a mutual first axis of symmetry passing through the end surfaces about which each end surface has N-fold rotational symmetry for some value of N where N is chosen from the group consisting of 2, 3 and 4. A peripheral cutting edge is formed at the junction between each end surface and the peripheral surface, the peripheral cutting edge having N curved cutting edges merging with N straight cutting edges which extend between the curved cutting edges at extremities thereof. The curved cutting edges of the two end surfaces are not aligned in an end view of the cutting insert along the first axis of symmetry.

Applicator (1) for a cosmetic product, typically a mascara, comprising an application means (4) having an axial core (40) which is unitary with axial rod (3) at its lower part (31) and a stack (41) of a plurality of N elements which cooperate with axial core (40) through a typically central orifice (50) allowing the axial core (40) to extend therethrough, characterized in that: the elements are elements E (5) lacking complete rotation symmetry, and the axial core (40) and the plurality of elements E (5) operate jointly with an angular orientation means for elements E (5) with respect to axial direction (10), in a transverse plane (11) which is perpendicular to the axial direction (10), in a manner that each element E_i (5) is rotatably connected with axial core (40) and has a predetermined angular orientation α_i with respect to the axial core (40).

A rake face (12) is formed on the both sides of an insert main body facing outside in the thickness direction thereof to make a pair, a cutting edge (14) is arranged on each side which constitutes an outer periphery of the rake face (12), the cutting edge (14) is provided with a major cutting edge (18A) and a minor cutting edge (18B) A connection part (20) formed in a concave curved shape is formed on the insert main body over the entire thickness direction of the insert main body. Of the pair of rake faces (12), each cutting edge (14) on the outer periphery of the first rake face (12A) and each cutting edge (14) on the outer periphery of the second rake face (12B) have rotation symmetry with each other.

The invention discloses a low-pass and high-absorption electromagnetic functional layer, which comprises a low-pass and high-resistance frequency selection surface and a wave absorption unit array, wherein the low-pass and high-resistance frequency selection surface comprises metal structure unit arrays which are etched on two surfaces of a dielectric substrate and are different in structure size; the periods p of the unit arrays are 10.0mm to 20.0mm; metal structure units have rotation symmetry; the frequency selection characteristics of the metal structure units are irrelevant to the polarized direction of an incident wave; the metal structure units on two surfaces are different in size; the wave absorption unit array is a periodic array which comprises square or round sheets which are fabricated by magnetic loss radar wave-absorbing materials or resistance type wave-absorbing materials; the wave absorption unit array has broadband wave absorption performance on a high-frequency band; the sizes of wave absorption units are smaller than those of the metal structure units; and each wave absorption unit is adhered to one side of each metal structure unit with a relatively small size of the low-pass and high-resistance frequency selection surface. The obtained material is small in insertion loss, small in thickness, flexible in design and low in cost.

A pixel array and a manufacturing method thereof, and an organic light emitting diode array substrate are disclosed. The pixel array comprises a plurality of pixels. Each pixel comprises four sub-pixels. Sizes of the four sub-pixels are the same and shapes of the four sub-pixels are an isosceles trapezoid. The four sub-pixels are arranged in a shape of a half of a regular hexagon. A display screen possessing the above structure has high rotation symmetry. A high resolution ratio and a high homogeneous degree can be acquired from each direction of the display screen.

A rotary position sensor is provided that includes a sensing disc having an N-fold rotation symmetry and capacitive sensing pads arranged in an array pattern, where the array pattern has at least 4N-fold rotation symmetry, where N≧2, a scale disc disposed opposite the sensing disc, where the scale disc includes a pattern of conductive pads that have a sinusoidal-shape, where the pattern of sinusoidal-shaped conductive pads produce four sinusoidal capacitance waveforms in quadrature phase with the capacitive sensing pads as the sensing disc and the scale disc are rotated relative to one another to provide angular position information. to provide angular position information. This is achieved by making the overlapping area of the of the capacitive sensing pads change in a sinusoidal fashion with rotation.

Apparatus, products, and methods are described that relate to blending various disparate optical surfaces in a smooth and continuous manner. In cross section, the two disparate surfaces are represented as meridional profiles. A blend zone profile is described by a single third-order polynomial. In the case of rotationally symmetric optics, one cross-section suffices for the description of the entire surface. In the case of non-rotationally symmetric optics, an increased number of cross-sections are necessary to produce the desired three-dimensional surface, thus meridional profiles are calculated at selected azimuthal locations to describe the full surface.

A light source apparatus includes a lamp, an ellipsoidal mirror collecting a part of light radiated from a light transmission plane of the lamp, and a spherical mirror collecting another part of the light radiated from a light transmission plane not collected by the ellipsoidal mirror and reflecting it on the ellipsoidal mirror, in which a reflection plane of the ellipsoidal mirror and the reflection plane of the spherical mirror are in a form of non-rotation symmetry to an optical axis connecting a focal position F1 corresponding to a source of luminescence of the lamp to a focal position F2 of the light collected by the ellipsoidal mirror respectively. The distance between the reflection plane of the spherical mirror and the source of luminescence of the lamp is shorter than the distance between the source of luminescence and the focus of the light collected by the ellipsoidal mirror, and a part of the reflection plane of the ellipsoidal mirror is formed around the optical axis.

A two-dimensional photonic crystal surface-emitting laser having a photonic crystal (20) in which a photonic crystal periodic structure (21) is located in or near an active layer (first medium) (12) which emits light when carriers are injected thereto. The photonic crystal periodic structure (21) comprises a second medium with a refractive index different from that of the active layer scattered in two-dimensional periodic array. The photonic crystal periodic structure is of a square lattice structure or a triangular lattice structure which has translation symmetry but does not have rotation symmetry. Alternatively, the phtonic crystal periodic structure is of a square lattice structure or a rectangular lattice structure which is classified into pl, pm, pg or cm according to the two-dimensional pattern classification method. It is the most desirable that the lattice structure is composed of triangular lattice points.

A tool has disks or ring disks arranged for metal-cutting, which are stacked on top of each other in an overlapping fashion and engage into each other at their incisions which reach from the outer circumference up to the center point of the disks or the inner circumference of the ring disks. The incisions of the directly adjacent disks or ring disks are respectively angularly offset by 360°/n, with n being the number of the disks or ring disks. A production method is also provided for such a tool, in which the disks or ring disks are incised up to the center point or inner circumference, are completely slid into each other at the incisions, folded towards one another and displaced until an angular offset of the incisions of 360°/n is produced.

The feed source of the corrugated horn comprises a harmful harmonic mode suppresser, the corrugation groove mode converter with double-groove structure, the frequency change and angle change transition section with double-groove deep corrugation structure and the radiation section with double-groove deep corrugation structure. The corrugation groove mode converter combines the harmful harmonic suppresser and the annular loading groove as well as the straight groove so as to reach the purpose of restraining excitation of the harmful harmonic mode, lowering reflectino loss and dual-band joint use. The invention possesses the features of rotation symmetry of the radiation pattern in two discrete frequency ranges, low electrical level of the side lobe and cross polarization, low reflection loss and high gain.

A head body h1 includes a recess part 14 for a socket. A socket 10 is attached to the recess part 14 for a socket. A weight body 12 is detachably attached to the socket 10. The weight body 12 can be secured by relative rotation of an angle +θ°. The weight body 12 can be detached by relative rotation of an angle-θ°. The weight body 12 includes an engaging part 32. The socket 10 includes a first hole part 18 and a second hole part 20. The engaging part 32 can take an engaging position EP and a non-engaging position NP at the second hole part 20 by the relative rotations. A sectional shape of the engaging part 32 has N-fold rotation symmetry. N is an integer of 1 or greater and 3 or less.

The invention discloses a free-form surface-based spectral imaging system, which is characterized by comprising an incident slit, a curved prism, a free-form surface reflector, a plane reflector and a detector image plane. The incident slit serves as the object plane of the spectral imaging system. Light rays, far from the heart of an object space, inject onto the curved prism through the incident slit. After the transmission process, the light rays are reflected by the free-form surface reflector, then transmitted through the curved prism again, and finally imaged on the detector image plane after being reflected by the plane reflector. According to the technical scheme of the invention, based on the non-rotation symmetry of the free-form surface, the defect that a grating is low in diffraction efficiency and overlapped in spectral orders can be effectively overcome. Meanwhile, only one reflector and one prism are adopted, so that the aberration caused by the increased field of view can be effectively balanced. The imaging range of the system is enlarged, and the imaging quality of the system is improved. In addition, both the size and the weight of a spectrometer are reduced, and the system is simplified. The system can be applied to airborne applications large in field of view, large in relative aperture and wide in spectrum.

Imaging systems, in particular a projection objectives of a microlithographic projection exposure apparatus, are provided. The imaging systems can have an optical axis and produce an image field which is extra-axial relative to the optical axis. The imaging systems can include a first optical element which causes a first distribution of the retardation in a plane that lies perpendicular to the optical axis, and at least one second optical element which causes a second distribution of the retardation in a plane that lies perpendicular to the optical axis. The second distribution of the retardation can at least partially compensate the first distribution of the retardation. The first and the second optical elements can be designed without rotational symmetry relative to the optical axis.

The present application discloses an optical imaging system. The optical imaging system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens that have a focal power and are arranged from an object side to an image side along an optical axis; at least one of mirror surfaces from the object side surface of the first lens to the image side surface of the sixth lens is a non-rotationally symmetric aspheric surface; the optical imaging system has an X-axis direction and a Y-axis direction that are perpendicular to each other in the plane perpendicular tothe optical axis; and in the Y-axis direction, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the optical imaging system and half of the maximum field angle Semi-FoV of the optical imaging system satisfy the following conditions: ImgH>4mm, and Semi-FOV>60 DEG.

The invention provides a flow distribution device for pressurized-water nuclear reactor, which is of a ball-bowl-shaped mesh structure. The flow distribution device is characterized in that the inferior of the bottom of the distribution device is fixedly provided with supporting rib plates, the middle upper part of the circumferential side wall of the ball bowl of the distribution device is provided with multiple rows of unidiameter round open pores in a rotation symmetry manner, and each row of open pores comprise a plurality of round holes which are uniformly distributed in the circumferential direction; three rows of square drain holes are formed in the positions of the lower part of the circumferential side wall of the ball bowl of the distribution device, away from a central shaft by different radial distances, each row of square drain holes comprise a plurality of square holes which are uniformly distributed in the circumferential direction, and the supporting rib plates are not provided with square holes; and the central region at the bottom of the ball bowl of the distribution device is provided with a plurality of round drain holes. The flow distribution device of the pressurized-water nuclear reactor provided by the invention can well meet the related requirements of a chamber flow field under a pressure container, the sufficient metal is filled under the serious accident working condition of a reactor core so as to meet related requirements on reactor core melting, and meanwhile, the structure has the advantages that the maintenance and the inspection are convenient, the in-pile component vibration is alleviated, and the like.

The invention discloses a large view field super resolution imaging device which comprises a base and a super-surface, wherein the base and the super-surface are successively arranged in the bottom-up sequence. The super-surface is composed of nano-unit structure arrays which are arranged in succession on an ultra-thin metal or a dielectric film. A nano-unit structure is a deep sub-wavelength structure. According to the invention, geometric phase on the nanostructure is used to control the electromagnetic wave symmetry; electromagnetic waves are converted from rotation symmetry to translational symmetry to acquire large view field perfect focusing near 180 degrees; if curved face or multi-plane combination is used, large view field imaging can be realized; the work bandwidth can cover the entire electromagnetic spectrum; the resolution is close to or even beyond the diffraction limit; and the device has a wide application prospect in the field of large view field super resolution imaging.

The present invention relates to a quadrupole mass analyzer which is a core equipment of a majority of mass analyzer, particularly to a quadrupole mass analyzer with a hyperbolic surface made of quartz which is capable of enhancing resolving power and analytical performance of a mass analyzer. The quadrupole mass analyzer according to the present invention includes four quartz tubes separated by predetermined distance to form a shape of rotation symmetry and being parallel to each other; an electric part formed with a predetermined area by a platinum membrane being divided into a prefilter electrode part and a main filter electrode part in a longitudinal direction of the quartz tube in a circumferential surface in an axial direction of the rotation symmetry of the quartz tube, a cross-section of the platinum membrane on an opposing quartz tube forming a substantial hyperbolic surface; a quartz pin being chamfered at both ends in a shape with a same radius curvature as the quartz tube and being closely fixed between the adjacent quartz tubes; and an electrically conductive connection member electrically connecting each of prefilter electrode parts and main filter parts of the opposing quartz tubes so as to apply RF and DC electric source.

The invention discloses a Terahertz three-wave-band narrow-band band-pass filter based on a metamaterial. The filter comprises three nested metal square ring resonance units and a filter unit formed by a dielectric layer and a cross metal resonance unit. In the invention, through using the filter unit, a terahertz wave band is used to realize a three-wave-band narrow-band band-pass filter. A structure unit of the filter possesses rotation symmetry, and the filter is insensitive to terahertz wave incidence polarization and large angle incidence and still maintains a good three-wave-band filtering characteristic. The three-wave-band filtering characteristic of the composite structure is from linear superposition of filtering characteristics corresponding to the three square ring resonance units respectively. Through changing a geometrical size of each square ring resonance unit, a corresponding filtering frequency range is regulated and controlled. Based on the above condition, more wave band filtering can be realized in the terahertz wave band. The design of the filter is simple, the size is small, processing is convenient and a high practical value is possessed in terahertz technologies of terahertz communication, imaging, spectral analysis and the like.