97results about How to "Large scanning angle" patented technology

An optical scanning device is disclosed that is manufactured through a simple mounting process and is provided with a hermetically sealed oscillation space for an oscillation mirror. The optical scanning device includes plural drive electrodes for driving the oscillation mirror and plural external electrodes of the drive electrodes that are formed at the same height.

A biaxial micro-electromechanical (MEMS) device is disclosed. The device includes a gimbal rotatable about a gimbal axis of rotation. A pair of gimbal torsion bars connects the gimbal to a support along the gimbal rotation axis. A mirror plate is rotatable about a mirror axis of rotation, the mirror plate rotation axis being substantially perpendicular to the gimbal rotation axis. A pair of mirror plate torsion bars connects the mirror plate to the gimbal along the mirror plate axis of rotation. One or more gimbal moment-of-inertia-altering blocks are positioned on a surface of the mirror plate away from the gimbal axis of rotation. Additionally, one or more mirror plate moment-of-inertia-altering blocks are positioned on a surface of the mirror plate away from the mirror plate rotation axis such that the distance from the mirror plate axis determines a resonant frequency of the biaxial MEMS device.

The invention relates to a resonant scanning mirror, a scanning method, a scanning angle measurement method and a resonant scanning mirror processing method. The resonant scanning mirror comprises a steel sheet, a magnet, a driving coil and an angle measurement coil, wherein the steel sheet comprises a first torsion shaft and an inner frame connected with the first torsion shaft, the inner frame is provided with a smooth surface suitable for beam reflection, the magnet is suitable for generating the single-directed magnetic field at the level of the steel sheet, the driving coil is arranged inthe inner frame of the steel sheet and is suitable for bearing the force in the magnetic field generated by the magnet to drive the inner frame to rotate when a driving current is inputted, and the angle measurement coil is arranged in the inner frame of the steel sheet and is suitable for measuring a scanning angle of the inner frame. The resonant scanning mirror is advantaged in that on one hand, large-aperture and large-angle scanning can be realized with relatively low cost, on the other hand, a piezoresistive or capacitance measurement angle measurement realization method in the MEMS process is simplified, the process is simple, and cost is low.

The invention discloses a double-scanning view filed shared window laser radar system based on a micromirror, the laser beam generated by a laser is divided into two paths through a laser beam splitter, one path of laser light beams is emitted to the micro-mirror through a first through hole, and is emitted to a detection target through the micro-mirror; and the other path of laser light beam is reflected by a reflector and then is emitted to the micromirror through a second through hole, and is emitted to the detection target through the micro-mirror; the laser beams emitted to the micromirror through the first through hole and the second through hole have a first included angle theta; the echo light beams reflected from the detection target are reflected to the first single-side reflector and the second single-side reflector through the micromirror, and are received by the corresponding light detectors. According to the invention, the laser beam splitter is used for doubly scanning the view field, and the laser radar system can achieve a large enough scanning angle, and is particularly suitable for being applied to full-automatic driving with high requirement on a scanning view field.

One embodiment of the invention discloses a laser radar and a laser radar control method. The laser radar comprises 2N+1 laser emitters for emitting laser; a vibrating mirror for changing the opticalpath direction of the emitted laser; N is an integer and N is no less than zero. According to the embodiment, since the laser emitters are added, the scanning scope of laser radar is enlarged and therefore the scanning angle of the laser radar is increased.

The invention discloses a liquid crystal optical waveguide and laser radar. The liquid crystal optical waveguide comprises a liquid crystal assembly, a waveguide core, a cladding layer and a first conductive film. When the first conductive film is not connected with a first electrode, the waveguide core is in a mode guiding mode, and therefore, when the laser beams enter the waveguide core, the laser beams can carry out total reflection propagation in the waveguide core. Due to the fact that the first conductive film is arranged on one side of the liquid crystal assembly, when the first conductive film is connected with the first electrode, the liquid crystal assembly is in an electric field, so that the liquid crystal molecules can be re-ordered under the action of the electric field, andthe refractive index of the liquid crystal assembly is changed, and at the moment, the waveguide core is in a radiation mode state. When the laser beams are emitted into the waveguide core, the laserbeams can be refracted into the liquid crystal assembly, and the original laser beams can be deflected under the action of the liquid crystal molecules, so that the laser beams can be emitted at different angles, and therefore, the laser beams can complete scanning of the plane direction of the vertical waveguide core.

The invention relates to a laser projection system which comprises a projection screen and a laser projector, wherein the projection screen comprises at least one light emitting layer, and the light emitting layer comprises at least one light emitting substance which can be excited to generate excited light in another wavelength range when irradiated by exciting light in a wavelength range; the transverse distances between the light emitting substances parallel to the plane of the projection screen are far shorter than the cross section diameter of a laser beam; and the laser projector comprises a laser light source module, a laser signal modulation module, a light combining module, a rotary plane mirror module, a rotary plane mirror control module and a signal conversion module. In the invention, exciting laser is generated according to an image signal of a single picture or a dynamic picture and projected to the matched projection screen to generate an image so as to ensure that a high-recognition projection picture can be presented on the projection screen under natural light environment through a nearly transparent effect, and a user can see the projected picture and an objectbehind the projection screen at the same time so as to promote the use efficiency and the application range of the laser projection system.

The invention discloses a control system and method for a laser radar galvanometer servo motor. The system comprises an upper computer, a drive control digital module, a three-loop control analog module, a high-frequency pulse laser front end and a scanning galvanometer, and the drive control digital module comprises a main control ARM unit and an FPGA unit, which are connected with each other. The method comprises the following steps: after the galvanometer servo motor starts to work smoothly, judging whether the system performs scanning in a working mode with the highest performance, judgingthe mode according to a set threshold, and adopting two index improvement methods: in a smooth speed running mode, importing an interpolation module to improve the resolution of a control signal so as to achieve the purpose of high-precision scanning; and in a high-speed scanning mode, importing a repeated tracking accumulated error control unit to perform error collection and correction for multiple cycles so as to achieve the purpose of improving the precision. The control system disclosed by the invention ensures stable and efficient operation of a high-precision three-dimensional imagingscanning system in a high speed state.

The invention provides a high density photon integrated waveguide grating array which is used for the device transmitting multipath optical signals. The high density photon integrated waveguide grating array comprises three or more parallel arranged waveguide gratings. The propagation constant of each waveguide grating is different from that of other adjacent waveguide gratings. The period of eachgrating is related to the propagation constant of the waveguide. The optical signals pass through different waveguide gratings and can be emergent at the same angle. The interval between the waveguide gratings is small so that the array is suitable for the optical phased array antenna. Large-angle transverse scanning is realized by changing the relative phase difference among all the waveguide gratings so as to have quite wide application prospect in the field of laser radar, medical imaging and wireless communication.

The invention provides a lidar scanning device based on multi-spatial light modulator splicing, and the device comprises a light source component, a beam splitting prism, a detection target and a spatial light modulator, wherein the light beam emitted by the light source component reaches the detection target through the spatial light modulator and the beam splitting prism in order, or the light beam emitted by the light source component reaches the detection target through the beam splitting prism and the spatial light modulator in order. The lidar scanning device provided by the invention utilizes the phase modulation capability of the spatial light modulator to control the shape and deflection direction of the light beam, generates a multi-point laser dot matrix at one time, and then quickly generates a laser scanning dot matrix by combining the timing refresh capability of the spatial light modulator to complete the scanning and detection of the target space, thereby improving theworking efficiency of the lidar system.

The invention discloses a dual-frequency common-caliber VICTS phased-array antenna. The antenna comprises a radiation layer, a parallel plate waveguide layer and a feed network layer which are sequentially arranged from top to bottom, the feed network layer is used for accessing external TE mode electromagnetic waves, converting the accessed TE mode electromagnetic waves into TEM mode electromagnetic waves and outputting the electromagnetic waves to the parallel plate waveguide layer, the parallel plate waveguide layer is used for transmitting the TEM mode electromagnetic waves input into the parallel plate waveguide layer to the radiation layer in an air medium conduction mode, and the radiation layer is used for transmitting the TEM mode electromagnetic waves transmitted to the radiation layer to a free space. The antenna has the advantages that: two frequency bands of a mobile satellite communication system can be covered at the same time, and the area, cost and power consumption of the mobile satellite communication system can be reduced when the antenna is used for the mobile satellite communication system.

The invention discloses a CTS frequency sweep antenna with a large frequency sweep ratio. The CTS frequency sweep antenna comprises a radiation layer and a broadband line source layer which are sequentially arranged from the top down, the broadband line source layer is used for converting electromagnetic waves which are input into the broadband line source layer and at different frequencies into plane waves at different frequencies and transmitting the plane waves to the radiation layer, the radiation layer is used for radiating the plane waves which are transmitted into the radiation layer and at different frequencies to a free space in different beam angles, and the radiation layer is realized by adopting a nonuniform zigzag slow-wave structure. The CTS frequency sweep antenna disclosedby the invention has the advantages that a beam scanning angle in a frequency band range is relatively large and the frequency sweep ratio is relatively high.

The invention discloses a piezoelectric integrated MOEMS scanning raster micromirror and relates to the field of spectrum analysis and micro optical electro mechanical systems. The piezoelectric integrated MOEMS scanning raster micromirror consists of an integrated scanning raster micromirror, a torsion beam, a connecting beam, an angle sensor, a piezoelectric micro driver and a fixing frame. The integrated scanning raster micromirror is based on monotectic orientation (111) silicon substrate, a blazed grating is integrated on the front side, a groove is sapped in the back side, and the diffraction efficiency and device robustness are improved. For achieving large-angle scanning under low-drive voltage, the piezoelectric micro driver and the connecting beam are adopted to amplify drive displacement. For monitoring the motion state of the integrated scanning raster micromirror in real time, the piezoelectric angle sensor is integrally integrated on the connecting beam. The piezoelectric integrated MOEMS scanning raster micromirror is novel and simple in structure and compatible with an integration process, the diffraction efficiency, resolution ratio, robustness and integration level of the scanning raster micromirror can be remarkably improved, and the driving and angle sensing properties of the scanning raster micromirror are improved.

The invention discloses an abnormal broadband acousto-optic deflection device. An acousto-optic medium is arranged inside a base; a lower electrode layer, a bonding layer and an upper electrode layer are arranged on the sound transmission surface of the acousto-optic medium; an energy converter is arranged on the upper electrode layer; the energy converter is provided with a first surface electrode and a second surface electrode. The acousto-optic medium is a gallium phoshpide crystal, an included angle beta between the direction of the sound transmission surface of the acousto-optic medium and the axis of the gallium phoshpide crystal [001] is smaller than 5 degree, and the optical axis is vertical to the light incoming surface; the energy converter is made of X cutting type lithium niobate crystal for stimulating transverse waves, and the thickness of the energy converter is 1.4-1.6 microns; a correction included angel theta is formed between the light incoming surface and the light outgoing surface of the acousto-optic medium, and the correction included angel theta enables diffracted light to be symmetrical about the optical axis in a working frequency range. According to the abnormal broadband acousto-optic defection device, the scanning angle of the diffracted light is increased, the diffraction efficiency is improved, and the volume of a signal processing system is greatly reduced.

The invention, which belongs to the technical field of optical displaying, provides a high-speed optical scanning display device. The structure of the device is characterized in that the device comprises a light source (1) a micro drift angle generation module (2), a local ellipsoidal reflector (3) and a receiving screen (4), wherein the micro drift angle generation module (2), the local ellipsoidal reflector (3) and the receiving screen (4) are successively arranged along an optical path. The micro drift angle generation module (2) enables a micro drift angle of light to occur; the local ellipsoidal reflector (3) is used for amplifying the drift angle; and then a light spot for scanning with a control signal is formed at the receiving screen (4) so that image displaying is realized. According to the invention, problems of poor precision and difficult stability control of optical machine scanning as well as a small scanning angle of acousto-optic scanning can be solved. The display device has the characteristics of high scanning precision and high stability; and the micro angle change of the light can be amplified to 1 to 4 magnitude orders.