15 results about "Focal zone" patented technology

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.

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.

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 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.