22 results about "Focal zone" patented technology

The invention discloses an electromagnetic shock wave source, which comprises a base, a sealed chamber and a plurality of groups of electromagnetic units, coils of the plurality of groups of electromagnetic units are arranged according to a certain angle, and a plurality of focuses are combined according to different ranges after focusing. And a desired large focusing area which is not limited by the central strength of a single coil and consists of a plurality of focal regions can be obtained. Meanwhile, the multiple electromagnetic units are arranged according to a certain angle, although the size of a wave source output port is larger than that of an output port of a single electromagnetic unit, the size of the wave source output port is far smaller than the sum of the sizes of the output ports of the multiple electromagnetic units, on the premise that the electromagnetic shock wave source focal region is enlarged, the equipment size is reduced, and the equipment adaptability is improved. The invention further provides pressure pulse equipment which comprises the electromagnetic shock wave source, the focal region of the electromagnetic shock wave source is enlarged, the electromagnetic shock wave technology obtains focal spots of any size, various specific treatment requirements are met, and the shock wave technology is suitable for the field needing large-area treatment and physical therapy.

The utility model relates to the technical field of semiconductor light emitting, and discloses a multi-focus light source device which comprises a substrate, a lens and a light emitting chip. The lens is arranged on the substrate, and a cavity structure is arranged between the lens and the substrate. The light-emitting chip is arranged on the substrate and in the cavity structure. The light-emitting chips at least comprise a first light-emitting chip and a second light-emitting chip. The lens is a convex lens, light emitted by the first light-emitting chip and light emitted by the second light-emitting chip are acted by the lens, a first focus area and a second focus area are formed on the side, away from the light-emitting chips, of the lens respectively, the image distances from the first focus area to the lens and from the second focus area to the lens are v1 and v2 respectively, and v1gt is met; v2. According to the utility model, at least two focus areas are arranged, and the double focus areas are staggered front and back. When the lens is heated to expand, the response area is located in the second focus area; when the lens is cooled and shrunk, the response area is located in the first focus area, the energy of the response area can meet the test requirement no matter how the temperature changes, and accurate test and high stability are achieved. The production process is simple, and the production cost is low.

To provide a device for laser machining a transparent workpiece.SOLUTION: The device includes: a first beam shaping device (106) having a beam splitting element (112) for splitting a first input beam (108) coupled into the first beam shaping device (106) into a plurality of component beams (114); and a focusing optical unit (116) that functions to image the component beams (114) coupled out of the first beam shaping device (106) into at least one focal zone (122), wherein the at least one focal zone (122) is introduced into a material (102) by the focusing optical unit (116) at at least one working angle (α) relative to an outer surface of a workpiece (104) in order to laser machine the workpiece (104), and material modifications associated with a crack formation in the material (102) are produced in the material (102).SELECTED DRAWING: Figure 1

The invention relates to a lighting device (1) for a motor vehicle, the lighting device comprising: - a light source (2); - an array of microlenses (3); and - a collector (4) configured to project an image of the light source onto an entrance face (31) of the array of microlenses, the collector comprising: - an elliptical first reflecting surface (41), the first reflecting surface comprising a first focal zone (Z1) and a second focal zone (Z2); and - a parabolic second reflecting surface (42), the second reflecting surface comprising a single focal zone (ZC), the light source being positioned at the first focal zone of the first reflecting surface, the single focal zone of the second reflecting surface being positioned at the second focal zone of the first reflecting surface.

A kind of bifocal ultrasonic treatment head, including mounting base and the transmitting assembly installed on mounting base;The mounting base includes mounting base plate and cooling seat installed on mounting base plate, and transmitting assembly is installed on cooling seat;The transmitting assembly is composed of several transmitting bases arranged in row, and transmitting base includes main transmitting unit for focusing acoustic beam energy at superficial focus and side transmitting unit for penetrating acoustic beam energy to deeper focus, and side transmitting unit is symmetrically arranged on both sides of main transmitting unit;Compared with prior art, by setting double-specification main transmitting unit and side transmitting unit, acoustic beam focal point can be accurately matched with preset value, and the acoustic field emitted by main transmitting unit and side transmitting unit acts as heat source, which can generate thermal effect in specific subcutaneous area, to meet different levels of clinical treatment requirements.

A transmissive ophthalmic lens has a first surface opposite a second surface. The first surface includes a centrally disposed diffractive multifocal zone surrounded by a peripherally disposed refractive zone. The second surface is a refractive surface that can be non-multifocal or multifocal surface where each may include toric. The diffractive multifocal zone is no more than 2.5 millimeters in diameter producing a far focus and an Add focus and no less than 1.5 mm. A first groove and a second groove of the diffractive multifocal zone may be the only two grooves. A smoothened transition may be disposed between the two consecutive grooves and may include a refractive segment connected to each groove by a step. The diffractive multifocal surface has a base surface that may be monofocal or multifocal surface where each may include toric. The grooves may be configured for minimum spherical aberration at the Add focus.

The invention relates to a lighting module (1) of a motor vehicle, comprising: at least a first light source (21) arranged on a first face (31) of a support (3); at least a first light collector (41) comprising a reflective surface arranged to collect and reflect the light emitted by the first light source (21) as a single light beam, the first light collector (41) having a first edge (411) and a second edge, referred to as a transverse edge (412), adjacent to the first edge (411), the first light collector (41) is arranged relative to the support (3) of the first light source (21) such that a first edge (411) extends in a plane substantially parallel to a first face (31) of the support (3) and such that a second edge, referred to as a transverse edge (412), extends in a plane forming an angle with the first face (31) of the support (3); and at least one optical projection device (5), a first portion of which is arranged to project said first light beam, said first portion being arranged to form an image of a reflective surface of a first light collector (41), and the first portion of the optical projection device (5) has a focal region (8) located near the second edge, referred to as the transverse edge (412), such that an image of the first light collector (41) formed by the first portion of the optical projection device (5) has an upper cut-off line formed by the second edge, referred to as the transverse edge (412).

A transmissive ophthalmic lens has a first surface opposite a second surface. The first surface includes a centrally disposed diffractive multifocal zone surrounded by a peripherally disposed refractive non-multifocal zone. The second surface is a refractive non-multifocal surface. The refractive non-multifocal zone forms the far focus. The diffractive multifocal zone is no more than 2.5 millimeters in diameter to produce a far focus and an Add focus and no less than 1.5 mm in diameter for Multipeak performance. A first groove and a second groove of the diffractive multifocal zone may be the only two grooves. At least 20% of light is directed within the diffractive multifocal zone to one of the far and the Add focus. The diffractive multifocal zone may have a base curve that together with a peripheral zone is bi-sign aspheric around far focus and aspheric grooves configured for minimum spherical aberration at the Add focus.

This paper describes a double-sided aspherical diffractive multifocal lens and a method for manufacturing and designing such a lens in the field of ophthalmology. The lens includes optics comprising an aspherical front surface and an aspherical rear surface. Multiple concentric diffractive multifocal regions are designed on one of the two surfaces. The other surface may include a toric surface component. Compared to a single-sided aspherical lens, the double-sided aspherical surface design improves the modulation transfer function (MTF) of the lens-eye combination by reducing aberrations and enhancing visual contrast. The surface with multiple concentric diffractive multifocal regions produces near-focal, intermediate-focal, and far-focal points. The phase order of the diffractive annular lens region is shaped into a sinusoidal distribution.

This application discloses an adjustable focal zone focusing ultrasound method, a piezoelectric metasurface preparation method, and a system, relating to the field of electro-digital data processing. The method includes: determining key parameters of the Airy wave function based on the shape and size of the target focal region; determining the phase distribution of each piezoelectric unit based on the key parameters of the Airy wave function to form a binary phase distribution; preparing a piezoelectric metasurface with a binary phase distribution; and using the piezoelectric metasurface to achieve ultrasonic focusing. This application enables customized ultrasonic focusing according to different application requirements, improving applicability and flexibility. Simultaneously, this application enables precise control of the ultrasonic wave phase, greatly simplifying the structure of the application system, reducing manufacturing and maintenance costs, and improving the reliability and stability of the application system. This fills the technological gap of being unable to flexibly adjust FLHW and FWHW under low cost and without electrical control.

Ultrasound imaging systems and methods provide, upon receipt of input of a tap gesture at a location directly on the ultrasound image feed on the touchscreen display, such location indicating on the post scan converted ultrasound image frame a desired focal adjustment point, the processor causes the ultrasound imaging system to i) revert the post scan converted ultrasound image frame comprising the location of the desired focal adjustment point, by way of the cartesian co-ordinates, to its corresponding pre-scan raw ultrasound data frame; ii) calculate, on the pre-scan raw ultrasound data frame, the location of the desired focal adjustment point, by way of polar co-ordinates of the desired focal adjustment point; and iii) adjust at least one beamformer parameter of ultrasound signals being used to transmit and receive the ultrasound image to focus at the desired focal adjustment point, based upon the polar coordinates.

The present invention relates to an apparatus and to a method for processing a workpiece (1) made of a birefringent material having at least one optical axis (OA) by means of ultrashort laser pulses of a laser beam (20) from an ultrashort pulse laser (2), wherein the laser beam (20) is given a non-diffractive beam shape by a beam shaping device (3), wherein the laser beam (20) is given a polarisation distribution by a polarisation shaping device (4), wherein the laser beam (20) is focussed by processing optics (5) into a focal zone in a focal plane in the workpiece (1), wherein the workpiece (1) is irradiated with the laser beam and thereby processed, wherein the polarisation distribution compensates for the birefringence of the material of the workpiece (1).

The application relates to the technical field of medical equipment, and discloses an ultrasonic imaging method and ultrasonic equipment. The method comprises the following steps: acquiring a plurality of groups of ultrasonic echo beams generated by ultrasonic emission of an ultrasonic probe each time for a target part; dividing the plurality of groups of ultrasonic echo beams according to a preset grouping mode to obtain a first echo beam set and a second echo beam set; performing non-coherent compound processing on the first echo beam set to obtain a non-coherent processing result, and performing coherent compound processing on the second echo beam set to obtain a coherent processing result; fusing the non-coherent processing result and the coherent processing result to obtain a target echo beam; and performing imaging processing on the target echo beam to generate a target ultrasonic image. Through implementation of the technical scheme, image errors caused by phase problems near a transmission focal zone can be reduced to the maximum extent, and the accuracy of focused imaging is ensured.

The invention relates to an X-ray rotating anode, an X-ray tube and an X-ray radiator. The X-ray rotating anode according to the invention has:-a support body made of molybdenum and / or a molybdenum alloy,-a first focal point strip formed on the support body; the invention relates to a laser device comprising a substrate, a first focal zone formed on the substrate, a second focal zone formed on the substrate, the first focal zone and / or the second focal zone comprising tungsten and / or rhenium, characterized in that the first focal zone and / or the second focal zone are / is formed on the substrate by means of a VPS coating method, and the first focus zone and the second focus zone are spaced apart from each other by an intermediate section in the carrier between the first focus zone and the second focus zone.

The invention discloses an active lotus reflector assembly and a use method thereof, and relates to the field of optics, and the assembly comprises a transparent medium body which is provided with an ultimate annular reflecting surface which is an annular curved surface, the profile of the section of the ultimate annular reflecting surface on a plane containing the center line of the ultimate annular reflecting surface is a straight line section or a curved line section with an inclined angle relative to the center line; the annular light source is used for emitting light; the semi-closed space is formed in the transparent medium body and used for containing the annular light source, and the side wall of the semi-closed space is provided with an annular opening allowing light to be emitted out; by arranging the ultimate annular reflecting surface and the annular light source, reflection and focusing of light can be effectively achieved, an annular narrow focus area and an annular focus set group area are formed, the problem that the focus edge of a traditional system is fuzzy is effectively solved, and the selective reflecting film layer only reflecting the target wavelength lambda is plated on the surface of the ultimate annular reflecting surface. Different wave band requirements can be met, stray light interference is avoided, and the light path purity is improved.

This invention relates to an X-ray rotating anode, an X-ray tube, and an X-ray radiator. The X-ray rotating anode according to this invention comprises: - a carrier made of molybdenum and / or a molybdenum alloy; - a first focal zone formed on the carrier; - a second focal zone formed on the carrier; - wherein the first focal zone and / or the second focal zone comprises tungsten and / or rhenium, characterized in that the first focal zone and / or the second focal zone are formed on the carrier by means of a VPS coating method, and the first focal zone and the second focal zone are spaced apart from each other by an intermediate segment in the carrier between the first focal zone and the second focal zone.

The application is suitable for the field of optics, and discloses a fundus structure three-dimensional reconstruction method and a fundus imaging system. The method comprises the following steps: acquiring a plurality of pre-calibrated focal point positions and a micromirror array curvature corresponding to each focal point position, and determining an optimal focusing position for fundus imaging; taking the optimal focusing position as the center, determining a fundus imaging covering focal point interval according to the optimal focusing position, and acquiring a fundus image sequence of the focal point positions covered by the fundus imaging covering focal point interval; for each pixel in the fundus image sequence, calculating the neighborhood features of the pixel corresponding to different focal point positions in the fundus image sequence, obtaining the depth score of the pixel at different focal point positions, and using the focal point position corresponding to the highest depth score as the height information of the pixel; combining the lateral coordinate, longitudinal coordinate and height information of each pixel to form a point cloud set, and splicing the point cloud set to obtain a fundus three-dimensional structure. The fundus three-dimensional structure is accurately reconstructed through micromirror focusing.

The present application provides a design method and device for an electromagnetic focused shock wave acoustic lens. The method includes inputting initial design parameters into an acoustic wave mathematical model to establish a three-dimensional model of the electromagnetic focused shock wave acoustic lens, thereby obtaining a three-dimensional model of the acoustic lens. The acoustic pressure time-domain curve of each measurement point outside the electromagnetic focused shock wave acoustic lens is obtained through finite element simulation, and the measurement point with the highest sound pressure amplitude among multiple measurement points is used as the simulation focus position. The shock wave parameters and the shock wave focal zone size are calculated based on the acoustic pressure time-domain curve of each point outside the electromagnetic focused shock wave acoustic lens. The thickness of the acoustic lens, the inner curve of the acoustic lens, and the outer curve of the acoustic lens are determined as the target design parameters of the electromagnetic focused shock wave acoustic lens, so that the electromagnetic focused shock wave acoustic lens is manufactured according to the target design parameters. The method and device improve the design accuracy of the electromagnetic focused shock wave acoustic lens.

The invention discloses an in-pipe spherical particle acoustic radiation force measuring system and an acoustic radiation force measuring method.The measuring system comprises a horizontally-arranged transparent liquid filling pipeline and spherical particles arranged in the liquid filling pipeline, and the spherical particles are located in an acoustic wave focal region; the focused sound wave generating device comprises a function signal generator, a power amplifier and a focused ultrasonic transducer and is used for emitting focused sound waves into the tube body; the motion capturing and analyzing device is used for shooting and analyzing the motion state of the spherical particles; the data processing unit is used for receiving output of the image processing unit and calculating acoustic radiation force; and a position calibration scale. The device and the method are suitable for quantitative measurement of acoustic radiation force borne by spherical particles under the action of focused sound waves in a limited pipeline environment, and reliable experimental data and support can be provided for the fields of acoustic control, medical ultrasonic treatment, microfluidic technology and the like.

The invention relates to a method of manufacturing at least one nozzle assembly for atomising a fluid. The method comprises a) providing the at least one nozzle assembly pre-arranged in a wafer; and b) separating the at least one nozzle assembly from remaining wafer material. According to the invention, step b) comprises locally weakening the wafer between the at least one nozzle assembly and the remaining wafer material at at least two focal zones in the depth direction by the focusing of a laser beam. The invention also relates to a composite structure for forming such nozzle assemblies, the composite structure comprising at least two weakened zones in the depth direction. Finally, a nozzle assembly manufactured with the described method is claimed.

Light module of a vehicle lighting device The present invention relates to a light module (2) of a lighting device comprising an optical element (4) whose input surface (14) is provided with converging optical patterns (30) and whose output surface (18) has an external face at least partially opaque and having a plurality of openings (26) forming non-opaque zones (22), each non-opaque zone (22) being located on or in the vicinity of a focal zone (Z1, Z2) of light rays passing through one of the converging optical patterns (30), said light module (2) being further characterized in that at least some of the converging optical patterns (30) are configured to generate a double focus along two orthogonal convergence planes (P1, P2), and in that the openings (26) have an elongated shape with a principal elongation axis (28) which is perpendicular to a first convergence plane (P1).Figure for the abridged version: (fig.1).

This invention discloses a deep in-situ 3D bioprinting system and method based on spherical standing wave focused ultrasound. It includes a spherical focusing system for generating spherical standing wave focused ultrasound, a motion control system for controlling the focal zone position of the focused ultrasound, and a data processing system for acquiring and analyzing ultrasonic cavitation signals to obtain control signals. The spherical standing wave focused ultrasound provided by this invention has superior focusing performance compared to traveling wave focused ultrasound, enabling spherical focused ultrasound 3D printing while balancing printing depth and accuracy, and exhibiting less focal shift in complex tissues. The sphere is formed by two hemispherical transducers of the same size and opposite positions, creating a spherical standing wave focusing cavity. The focused sound field is composed of sound waves directly radiated from the spherical surface and sound waves reflected multiple times by the spherical surface. When the sound waves directly focused at the center of the sphere and the sound waves reflected in each subsequent reflection are in phase, a very high sound pressure can be generated at the center of the sphere, and the focal zone accuracy is improved.