233 results about "Optical beam deflection" patented technology

A Rydberg atom television receiver is disclosed. The receiver comprises a probe laser, a source polarizing beam displacer, a Rydberg atom receiver cell, receiver atoms, a detector polarizing beam displacer, a detector polarizing beam cube, a first photodiode, a second photodiode, a differential amplifier, a display, and a coupling laser. The receiver receives a modulated waveform imprinted on a radiofrequency carrier a displays a graphical representation corresponding to a modulation source.

2.1. The simultaneous acquisition of multiple images in the microscope should be made possible with greater flexibility. Furthermore, simultaneous acquisition should be made possible with less effort. 2.2. In a microscope (1) with a main beam splitter (22) and an adjustable beam deflection unit (21) for moving the illuminating light through the sample space (P), the beam deflection unit (21) is arranged optically between the light source (12) and the main beam splitter (22) for this purpose, so that the sample light reaches the sensor (28) away from the beam deflection unit (21), wherein both the illuminating light and the sample light pass through the same intermediate image (ZB).

The invention provides a laser welding method for an unequal-thickness heterogeneous hot-formed steel joint by cooperatively regulating and controlling annular light spots and light beam deflection. The method comprises the following steps: firstly, pretreating, clamping and positioning the PHS1500 and PHS2000 unequal-thickness ultrahigh-strength steel plates; then, the deflection angle of the light beam is adjusted to be within the range of-30 degrees to + 30 degrees; and finally, a galvanometer control system is used for driving a laser beam to conduct swing scanning in a circular track, and welding is completed under the condition that parameters such as laser power, welding speed, swing frequency, the ratio of swing amplitude to core ring energy and the like are set. According to the method, wire filling is not needed, the PHS1500 and PHS2000 butt welding joints can be effectively connected within the light beam deflection angle range of-30 degrees to + 30 degrees, efficient connection can be achieved within the light beam deflection angle range of-20 degrees to + 20 degrees, weld joint forming is effectively improved, weld joint grains are refined, and the problems of stress concentration and welding softening areas caused by different thicknesses and different strengths of plates are solved. And within the light beam deflection angle range of-20 degrees to + 20 degrees, the obtained joint welding seam is well formed, the tensile strength can reach 1400 MPa or above, and the method is suitable for manufacturing the tailor-welded structure of the unequal-thickness plates of the automobile body.

The invention relates to the technical field of laser welding, and particularly discloses a laser welding device for instrument processing, which adopts double stations with separated pre-clamping and processing, an operator can assemble and disassemble a workpiece at one station and simultaneously perform welding at the other station, so that the waiting time is obviously reduced, and the working efficiency is improved. A linkage clamping mechanism is used for ensuring that a workpiece is kept stable in the rotating switching process and is automatically converted into a high-locking-force state after reaching a machining station, the risk that the workpiece is turned over in traditional equipment is avoided, continuous, efficient and safe operation is achieved, and the device integrates the optical path adjusting and cleaning functions for the pollution problem of an optical system, so that the production efficiency is improved. When the laser angle is adjusted, the scraping strip is synchronously driven to remove pollutants on the light-transmitting plate, the maintenance period is prolonged, the stable welding quality is guaranteed, in addition, laser beam deflection is achieved through a worm and gear and a reflector structure, obstacles can be bypassed to weld hard-to-reach areas such as deep cavities and corners, the process of disassembling and reassembling is avoided, and the production integrity and efficiency are improved.

The invention discloses a surface plasmon resonance imaging system for expanding a dynamic range through a multi-mode optical path, and relates to the technical field of microscopic imaging, a laser outputs a monochromatic and linearly polarized continuous wave beam, a first dynamic beam deflection device performs dynamic angle deflection adjustment on the continuous wave beam, a prism is used for providing a total reflection interface, and a second dynamic beam deflection device is used for performing dynamic angle deflection adjustment on the continuous wave beam. Exciting an evanescent wave; a surface plasma resonance effect is generated through interaction of the SPR detection chip and evanescent waves, and sample characteristics are detected; the flow cell provides a sample flow channel, so that a sample is in full contact with the surface of the SPR detection chip; the second dynamic light beam deflection device cooperatively adjusts the propagation direction of reflected light on the surface of the SPR detection chip, and the imaging detection device captures a high-spatial-resolution SPR image formed by the reflected light and transmits the image to the upper computer in real time for processing and analysis. According to the invention, the change of the resonance angle can be tracked in real time, and high-sensitivity and high-resolution monitoring of the dynamic process of biomolecule interaction is realized.

2.1. To increase the resolution of quasi-confocal line scanning microscopes with a main beam splitter for coupling the illumination and detection beam paths, the "re-scan" method involves descanning the sample light in the detection beam path by the illuminating beam deflection unit. After descanning, the sample light is scanned again in the detection beam path by moving it across the sensor behind the confocal aperture by a second beam deflection unit in a direction transverse to the linear focus. To increase resolution in the longitudinal direction, the illumination line can be structured. This optical arrangement has the disadvantage of significant light losses due to the large number of optical interfaces that must be passed through. 2.2. A microscope in which the illuminating beam deflection unit is optically positioned between the light source and the main beam splitter, allowing the sample light to reach the sensor away from the illuminating beam deflection unit (non-descanned), is more light-sensitive and flexible. A control unit, in one operating mode, moves the sample light beam across the sensor using only the second beam deflection unit. Depending on the operating mode, synchronization with the first beam deflection unit may be provided. 2.3. Due to its high light sensitivity, the microscope is particularly suitable for fluorescence microscopy.

The invention discloses a moving target identification and tracking system based on an analog micromirror array (AMA), belongs to the technical field of photoelectric tracking and machine vision, and aims to solve the technical problems of slow response, large inertia and complex structure of a traditional mechanical tracking system. According to the technical scheme, an AMA composed of a plurality of MEMS micromirror units which can be independently controlled and have the static or quasi-static two-dimensional deflection capacity is adopted as a non-mechanical light beam deflection actuator, the AMA can be composed of micromirror arrays in various forms, digital image data are analyzed in real time to solve the target offset, and the non-mechanical light beam deflection actuator is obtained. And an instruction is generated to drive the AMA to deflect at a high speed so as to compensate the deflection, so that continuous and stable locking and tracking imaging of the moving target are realized. The system has the advantages of being high in response speed, high in tracking precision, free of mechanical inertia and compact in structure, supports flexible switching of various working modes such as wide-area scanning and long-distance tracking, and is high in application flexibility.

The invention provides a liquid crystal optical phased array imaging system and a design method thereof, and belongs to the technical field of liquid crystal optical phased arrays. The system comprises a camera, a lens, a beam splitter prism, a liquid crystal spatial light modulator, a super lens and a computer, and is suitable for a visible light band. Non-mechanical light beam deflection is achieved through the liquid crystal spatial light modulator, angle amplification and dispersion compensation functions are achieved in combination with the super lens, and the problems that a traditional mechanical light beam deflection technology is large in size and short in service life are solved, and the problems that an existing liquid crystal optical phased array is small in angle range and imaging aliasing is caused by dispersion are solved; the superlens adopts a three-layer nanostructure unit stacking design, the upper layer is a dispersion compensation structure, the lower layer is an angle amplification structure, and large-angle imaging and efficient spectrum utilization are realized through phase modulation; the invention has the advantages of compact structure, small volume, low cost, high stability and the like, and is suitable for the fields of laser radar, space optical communication, infrared tracking and the like.

A multi-junction laser-diode module includes (a) a multi-junction laser diode having a plurality of laser junctions stacked in a vertical dimension parallel to the fast-axes of the laser beams emitted by the laser junctions, (b) a fast-axis cylindrical lens collimating each laser beam in the fast axis, whereby the laser beams emerge from the fast-axis cylindrical lens with mutually nonparallel propagation directions, (c) a transmissive beam-deflecting element that deflects the laser beams in the fast-axis dimension after the fast-axis cylindrical lens to make their propagation directions parallel, and (d) a slow-axis cylindrical lens configured to collimate each laser beam in the slow axis. The transmissive beam-deflecting element corrects for the propagation-direction discrepancy between the laser beams, in the fast-axis dimension, caused by fast-axis collimation. The multi-junction laser-diode module can thereby produce a laser beam bundle suitable for high-brightness fiber-coupling.

The invention discloses a light scanning method, which comprises the following steps that: a first light deflection device deflects an incident light beam by a plurality of first deflection angles, and projects the deflected light beam to a polarization expanding device; the polarization expanding device amplifies the deflection angle of the deflected light beam in the corresponding deflection direction by a preset multiple, and projects the expanded light beam to the corresponding position of the second light deflection device; and the second light deflection device deflects the expanded light beam at a preset second deflection angle so as to project a scanning light beam. The light deflection angle can be continuously and finely adjusted within a larger angle range, and the structure of the light deflection device is miniaturized.

An optical switch comprising a set of input ports and a set of output ports, each input and output port configured to transport an optical signal having at least one component frequency channel. The switch comprises a first programmable deflection plane configured to deflect beams incident on it from the set of input ports to form a deflected array of beams, and a second programmable deflection plane configured to deflect beams incident on it towards the set of output ports. The switch also comprises a beam steering optical device positioned in the optical path between the first and second programmable deflection planes, configured to remap the deflected array of beams to form a remapped array of beams directed to the second programmable deflection plane, by changing the spatial positioning and / or orientation of each beam from the deflected array of beams in the remapped array of beams such that the spatial positioning and / or orientation of at least one beam of the deflected array of beams is changed differently to at least one other beam of the deflected array of beams.

The invention relates to the technical field of laser processing, and provides a dynamic focusing scanning system. The dynamic focusing scanning system comprises a dynamic focusing module, a light beam deflection module and a field lens focusing module which are sequentially arranged in the optical axis direction. The dynamic focusing module comprises a front convex lens group, a diaphragm and a rear convex lens group, the optical axis of the front convex lens group coincides with the optical axis of the rear convex lens group, and the center of the diaphragm is located on the optical axis of the front convex lens group; the front convex lens group is configured to focus the input collimated light to form a light spot, the diaphragm is located at a focus point of the front convex lens group, and the rear convex lens group is configured to expand a light beam passing through the diaphragm; the light beam deflection module is configured to deflect the light beam emitted from the rear convex lens group; the field lens focusing module is configured to focus the light beam emitted from the light beam deflection module to a focal plane. According to the invention, the diaphragm can be used for filtering the return light, so that the dynamic focusing scanning system is protected, and the damage to the dynamic focusing scanning system is reduced or avoided.

The invention relates to the technical field of laser radars, and discloses a laser radar beam scanning path optimization and energy efficiency management method based on an FPGA, and the method comprises the following steps: S1, collecting the point cloud data and obstacle distribution information of a target region in real time through an environment sensing module; s2, generating a dynamic scanning path based on space partition, and generating a self-adaptive spiral scanning path for avoiding obstacles; s3, executing multi-parameter collaborative energy efficiency adjustment, and dynamically matching the laser transmitting power, the receiver gain and the MEMS driving voltage; and S4, synchronously outputting the optimized scanning path and the energy efficiency instruction to a laser driving circuit and a light beam deflection controller through a hierarchical scheduling module of the FPGA. A detection area is divided into priority grids through an FPGA, a self-adaptive spiral scanning path is generated, a hardware-level sudden obstacle avoidance algorithm is utilized, the response time is shortened to be smaller than or equal to 5 ms, and the integrity of point cloud data is ensured.

The invention relates to the technical field of fast reflecting mirrors, in particular to a two-dimensional large-angle fast reflecting mirror device based on rigid support, which comprises a moving magnet type electromagnetic driving assembly and an eddy current sensor assembly which are arranged on the periphery of the central position in a base; the moving magnet type electromagnetic driving assembly drives the rigid supporting assembly to drive the reflector lens to deflect within a set angle, and the eddy current sensor assembly is used for detecting the deflection angle of the reflector lens. The rigid supporting assembly comprises a mirror holder, a supporting frame, a supporting long shaft and a supporting short shaft; the reflecting mirror lens is connected with the mirror holder, the mirror holder is arranged in the supporting frame through the supporting long shaft, and the supporting frame is connected with the base through the supporting short shaft; the mirror holder rotates in the first direction through the supporting long shaft and rotates in the second direction through the supporting short shaft. According to the invention, the rigid supporting assembly is driven by the moving magnet type electromagnetic driving assembly, so that the reflector lens deflects in two orthogonal directions around the supporting long axis and the supporting short axis, the limitation that the deflection angle of the existing reflector system is small is broken through, and two-dimensional large-angle and high-precision light beam deflection can be realized.

A system for free-space optical coupling between a two-dimensional optical transmitter array and a two-dimensional optical receiver array using planar optical elements includes a transmitter array configured to emit one or more optical beams, a first planar optical element configured to receive the optical beams from the transmitter array and generate one or more intermediate optical beams, a first spacer disposed between the optical transmitter array and the first planar optical element, a receiver array, a second planar optical element configured to receive the intermediate optical beams and generate one or more output optical beams directed to the receiver array, and a second spacer disposed between the second planar optical element and the optical receiver array. The TX and RX portions of the optical coupling system can be used in a LiDAR system as a light emitting element (beam steerer) and a detector, respectively. The planar optical element is configured to provide a wide field of view for the LiDAR.

The invention relates to the technical field of laser drilling, in particular to a real-time monitoring acousto-optic deflection laser drilling system, method, equipment and medium, and the system comprises a laser light source, a power monitoring module, an acousto-optic deflector, a galvanometer, a three-light coaxial device and a control system. The power monitoring module collects a power signal of a machining laser beam in real time, and the control system compares the power signal with a preset threshold value and dynamically adjusts laser output parameters. The three-light coaxial device carries out in-situ imaging on the surface of a workpiece while transmitting laser to obtain a drilling morphology image, and a control system recognizes defects such as fused heap or hole shape distortion based on the image and dynamically adjusts laser machining parameters or light beam deflection parameters. According to the system, through a double-closed-loop feedback mechanism, synchronous regulation and control of laser energy and machining morphology are achieved, and the consistency and precision of micropore machining are remarkably improved.

The invention provides a microscope with rapid quasi-confocal detection. The simultaneous acquisition of multiple images in a microscope should be possible with greater flexibility. In addition, simultaneous acquisition should be made possible with less effort. In a microscope (1) having a main beam splitter (22) and an adjustable beam deflection unit (21) for moving illumination light through a sample space (P), the beam deflection unit (21) is optically arranged for this purpose between a light source (12) and the main beam splitter (22) such that sample light away from the beam deflection unit (21) passes to a sensor (28), both the illumination light and the sample light passing through the same intermediate image (ZB). The invention also provides a method for scanning image acquisition by means of a scanning microscope.

A LIDAR apparatus for scanning a scene, comprising a transmitter stage, a receiver stage, a beam-steering engine configured to steer the light beam received from the transmitter stage in different directions to scan at least a portion of the scene, the beam-steering engine being responsive to steering commands to produce corresponding deflections of the light beam and an operation monitor for monitoring a beam-steering function of the beam-steering engine.

The utility model provides a laser diagnosis device comprising a first laser light source used for emitting diagnosis laser; the light deflector is connected with the output end of the first laser light source and is used for carrying out light beam deflection at a specific angle on the diagnosis laser; the optical fiber coupler is arranged at the output end of the optical deflector and is used for coupling the diagnosis laser with the deflected light beam into one optical fiber branch of the optical fiber array; the optical fiber array is connected with the optical fiber coupler and is used for transmitting the diagnosis laser coupled by the optical fiber coupler to a focusing microlens of the focusing microlens array; wherein the optical fiber branches in the optical fiber array are mutually independent; the focusing micro-lens array is connected with the optical fiber array and is used for focusing the diagnosis laser on the diseased tissue through a focusing micro-lens to generate a laser signal with tissue characteristic information; wherein each focusing microlens in the focusing microlens array is correspondingly connected with one optical fiber branch of the optical fiber array; the device is compact in structure, easy and convenient to operate and capable of conducting refined diagnosis on diseased tissue.

The invention is suitable for the technical field of laser processing, and provides a laser processing method, a controller, laser processing equipment and a circuit board. The laser processing method comprises the following steps: acquiring a target laser movement track of a to-be-processed workpiece; decomposing the target laser motion track into a first motion component of a first light beam deflection mechanism and a second motion component of a second light beam deflection mechanism; the first target speed of the first light beam deflection mechanism and the initial speed of the second light beam deflection mechanism when the second light beam deflection mechanism enters the second motion component are determined according to the processing point location distribution of the first motion component, and the initial speed is larger than 0; and controlling the first light beam deflection mechanism to execute the first motion component at the first target speed, and controlling the second light beam deflection mechanism to start speed change from the initial speed to a second target speed so as to execute the second motion component. According to the embodiment of the invention, the laser processing efficiency can be improved.

The application discloses a long-focus lens module and electronic equipment, the long-focus lens module comprises an imaging lens and a light beam deflection device; the light beam deflection device is arranged in the imaging light path of the imaging lens and is used for optically compensating a residual offset a still existing after compensation by the anti-shake module; the light beam deflection device comprises an angle or face shape adjustable transmission type optical element; the transmission type optical element is configured to switch from an initial state to a deflection state, and an image height change is caused by angle deflection or face shape change, so that an optical compensation amount of size-a is introduced to offset the residual offset a; in the deflection state, the relationship between the center field of view image height change DeltaIHc, the edge field of view image height change DeltaIHe and the lens magnification x satisfies the relationship formula: 0.07 <= DeltaIHe / DeltaIHc / x <= 0.4. The application introduces the image height change by angle deflection or face shape change of the transmission type optical element, so that the image height change corresponds to the change caused by the body shake, thereby weakening the influence of the body shake on the picture.

The application provides a deformable mirror assembly, comprising: a deformable mirror mirror body, a back surface of which is provided with a telescopic piezoelectric actuator, which comprises a plurality of linearly arranged actuating units; a pad, which is arranged on the back surface of the deformable mirror mirror body; a control system, which is used for providing an actuating alternating voltage to the telescopic piezoelectric actuator, so that the sinusoidal vibration of different actuating units adopts random amplitude and random phase; the peak-to-valley maximum amplitude of the mirror surface of the deformable mirror mirror body caused by the sinusoidal vibration overcomes the Rayleigh criterion, and the periodicity of the spatial frequency is destroyed through the randomness of the phase of the actuating unit, so that the homogenization of the light beam speckle is realized when the deformable mirror mirror body is used for light beam deflection. The application also provides a corresponding two-dimensional optical system. The deformable mirror assembly of the application improves the speckle homogeneity in the imaging process and reduces the influence of the speckle.

The invention discloses a terahertz polarization-independent achromatic beam deflection device and a use method thereof, and belongs to the technical field of terahertz application. The terahertz polarization-independent achromatic beam deflection device comprises a dielectric substrate layer and a dielectric cylinder microstructure layer, wherein the dielectric cylinder microstructure layer is arranged at the top of the dielectric substrate layer; the dielectric cylinder microstructure layer is composed of dielectric cylinder superatoms arranged in an array mode, the dielectric cylinder superatoms are of a sub-wavelength structure, and the distances between the dielectric cylinder superatoms in the adjacent rows and between the dielectric cylinder superatoms in the adjacent columns are all smaller than the wavelength of incident terahertz waves; the dielectric cylinder superatoms and the corresponding substrate form a basic unit of the light beam deflection device. According to the polarization-independent achromatic light beam deflection device, the achromatic effect of any polarization can be achieved within the broadband range of 0.6 THz-1. 2 THz.

This invention provides a beam-deflecting metasurface and a quantum sensor. The beam-deflecting metasurface includes a metasurface array, which in turn includes metasurface units. Each metasurface unit comprises a substrate unit block and a copper ring. In any metasurface array, the outer diameter of the copper ring is uniform. By changing the inner diameter of the copper ring, the transmission phase of the corresponding metasurface unit is altered. The beam-deflecting metasurface of this invention effectively controls the coupling and probe beams frequently used in quantum sensors, preventing the probe beam from being affected by the coupling beam. The overall structure is simple, and the cost of the beam-deflecting metasurface is low, enabling the quantum sensor to have a wide range of applications. Because the copper ring has a symmetrical structure, it is polarization-independent. For both the probe and coupling beams, the transmittance of the beam-deflecting metasurface remains above 90%, ensuring efficient transmission of the required optical signals.

The present invention discloses a large-field-of-view scanning method for a laser radar based on a liquid crystal phased array, comprising the following steps: expanding and deflecting a laser light source according to the aperture size of the liquid crystal phased array to obtain a target beam; phase-modulating the target beam using the liquid crystal phased array to achieve beam deflection, continuously changing the applied phase modulation to achieve annular scanning of the beam; reflecting the annular scanning beam using a conical reflector to achieve spatial transformation, thereby converting the circular scan into an arcuate scan and obtaining a preliminary large-field-of-view arcuate scan; reasonably setting the parameters of the conical reflector and the distance between the conical reflector and the liquid crystal phased array to filter out stray light such as grating lobes outside the scanning beam, thereby obtaining a final large-field-of-view arcuate scan. The present invention improves the scanning field of view of a phased array laser radar, filters out stray light such as grating lobes outside the scanning beam, and obtains high-quality large-field-of-view arcuate scans.

To provide an optical axis adjustment method and device capable of easily achieving high-precision speedy optical axis adjustment.SOLUTION: An optical axis adjustment device comprises a deflector 102 which deflects a light beam, an image sensor 101 which images an imaged surface P including a predetermined figure W indicating a predetermined light reception position through the deflector 102, and a processor 103 which controls the deflection direction of the deflector 102 based upon the captured acquired image, wherein the predetermined light reception position in the acquired image is detected from the predetermined figure W included in the acquired image, and the deflection direction of the deflector 102 is so adjusted that the predetermined light reception position meets a reference position r showing a main optical axis AXP before the deflection of the light beam in the acquired image.SELECTED DRAWING: Figure 5

The application belongs to the technical field of laser processing equipment, and discloses a light beam deflection mechanism applied to rapid scanning of a soft ceramic laser drilling and cavity opening equipment, comprising a two-dimensional acousto-optic deflection assembly, a radio frequency driving control system, a precision adjustment fixing assembly, an optical auxiliary assembly and a cooling and heat dissipation assembly, wherein each assembly is cooperatively matched and linked with an equipment galvanometer system and an XY moving platform; after being optimized by the optical auxiliary assembly, a laser beam is incident into the two-dimensional acousto-optic deflection assembly, the radio frequency driving control system is adjusted to realize high-precision and rapid deflection of the light beam, the precision adjustment fixing assembly guarantees positioning accuracy, and the cooling and heat dissipation assembly controls thermal effects. The application realizes 0.1 mu rad deflection accuracy and 1 mu s scanning switching speed, controls the soft ceramic processing thermal effect area within 5 mu m, and can satisfy fine processing of through holes, buried holes, blind holes and <50 mu m micro holes.

The present application relates to a kind of local light beam deflection virtual reality near-eye display optical structure.The structure includes micro display panel, optical imaging lens and light beam deflection superstructure surface.The light beam deflection superstructure surface includes substrate layer and nanostructure unit periodically distributed on the substrate layer, which is divided into different regions according to pixel position and designed differently, forming different deflection angles.The present application can realize the independent regulation of deflection angle of each pixel position, with the characteristics of simple design and wide applicability, which can be applied to VR virtual reality display system.

The application relates to the technical field of visual identification, in particular to a three-dimensional reconstruction device and method based on binocular camera and laser radar fusion under visual guidance, aiming to solve the problem of unstable three-dimensional reconstruction precision of binocular camera and laser radar fusion. The method comprises the following steps: acquiring two-dimensional images of left and right views of a field of view region; if there is a region of interest in the two-dimensional images, the pixel position of the region of interest is extracted, and based on preset calibration parameters and the pixel position, the azimuth angle and the pitch angle of the region of interest relative to the optical axis of the device are obtained; a scanning control signal is generated according to the azimuth angle and the pitch angle, and is output to a light beam deflection scanning unit; distance information of the region of interest is acquired, and a three-dimensional reconstruction model of the region of interest is obtained according to the distance information and the angle information. The three-dimensional reconstruction device and method based on binocular camera and laser radar fusion provided by the application improve the matching stability and reconstruction precision of complex regions such as weak texture, strong reflection and occlusion.

To realize more horizontal / vertical resolution points and higher frame rate than the conventional one.SOLUTION: A light beam deflector comprises: a wavelength variable semiconductor laser 1; a plane optical waveguide circuit 3 that splits light emitted from the wavelength variable semiconductor laser 1 into first number of beams same as the number of areas obtained by dividing an object space in a first direction, and emits the beams so as to select the emission position of the split beams in the first direction so that a position of one pixel in each corresponding area is irradiated with the beams; a dispersive element 5 that deflects the first number of beams emitted from the plane optical waveguide circuit 3 respectively at angles according to wavelengths of the beams in a plane parallel to a second direction perpendicular to the first direction; an optical system 6 that converts the first number of beams emitted from the dispersive element 5 to be parallel to an axis of the optical system; and an optical system 7 that deflects the first number of beams emitted from the optical system 6 to be emitted to the object space.SELECTED DRAWING: Figure 1