525 results about "Cylindrical lens" patented technology

The utility model discloses a deformable lens, which comprises a first spherical lens group, a second spherical lens group, a first cylindrical lens group, a third spherical lens group, a second cylindrical lens group, a fourth spherical lens group and a twentieth lens which are sequentially arranged from an object space to an image space, the focal lengths of all the lens groups meet the following conditions: 1.4 lt; f (G1-G7) Y / f (G1-G7) Xlt; 1.6); 1lt; 1lt; f (G2) X / f (G1-G4) Xlt; -0.7,-0.7; -2lt;-2lt; f (G3) X / f (G1-G4) Xlt; -1.3,-1.3; 361t; 361t; f (G5) Y / f (G5-G7) Ylt; 24); 0.8 lt; f (G1-G4) X / f (G5-G7) Xlt; 1.2; 1.1 lt; 1.1 lt; f (G1-G4) Y / f (G5-G7) Ylt; and 1.7. The integrated design is adopted, so that the lens is small in size, and meanwhile, the optical performance of high resolution, low respiration, low distortion, 1.5 X high magnification and the like is obtained.

The invention discloses a calibration device with a spectrum self-calibration function and a high-resolution spectrum calibration method thereof. The device comprises a narrow-band light source, a broadband light source, an optical fiber isolator, a coupler, an interference system, a multi-way switch, an FP (Fabry-Perot) cavity, a collimator, an orthogonal dispersion system and a computer, wherein the orthogonal dispersion system consists of a cylindrical lens, a reflector, a virtual phase array, a grating, a focusing lens and an industrial camera; according to the device, different light source paths are gated, FP cavity modulation and orthogonal dispersion system light splitting are utilized, and an industrial camera is combined to receive light signals. According to the method, the mapping relation between pixels and wavelengths can be established, the two-dimensional spectrum is compressed into the one-dimensional calibration spectrum through light intensity modulation and normalization processing, the calibration process of the orthogonal dispersion system is simplified, and the measurement precision is improved; and system drift can be compensated in real time through self-checking calibration, and the reliability of a measurement result is ensured, so that accurate calibration and measurement of a high-resolution spectrum can be realized.

The embodiment of the invention provides a head-up display device, a design method and a control method thereof, and a carrier, and relates to the technical field of head-up display. The head-up display device provided by the embodiment of the invention comprises an image source used for generating a left eye image light beam and a right eye image light beam; the lenticular grating comprises at least two lenticular subareas, and each lenticular subarea comprises at least two lenticular lenses; the at least two cylindrical lens subareas comprise a first cylindrical lens subarea and a second cylindrical lens subarea; the image source comprises a plurality of sub-pixels, the sub-pixels comprise a first type of sub-pixels, and the first type of sub-pixels are configured to reduce luminance or extinguish; in both the first lenticular partition and the second lenticular partition, the first lenticular partition includes a first type of sub-pixels. According to the head display device, the design method and the control method thereof, and the carrier provided by the embodiment of the invention, the crosstalk problem can be alleviated, and meanwhile, the problem of resolution reduction caused by sub-pixel extinguishing can be alleviated.

The invention discloses a medium-long-focus full-frame large-magnification deformation lens, which comprises a first lens group, a second lens group, a third lens group, a fourth lens group and an aspherical lens which are sequentially arranged from an object plane to an image plane along an optical axis, and the focal length distribution of each lens of the medium-long-focus full-frame large-magnification deformation lens meets the following conditions: 73mm mlt; f (1-15) Ylt; 77 mm, 44 mlt, 77 mm, 44 mlt; f (1-15) Xlt; the thickness is 49mm, and the thickness is 1.55 lt; f (1-15) Y / f (1-15) Xlt; 1.65, 0.2 lt, 1.65, 0.22 lt; f (2) Y / f (1-8) Ylt; 0.7, 7.8 lt, 0.7, 7.8 lt; f (1-2) Y / f (3-8) Ylt; 23.3, 0.4 lt; 23.3, 23.4; f (1-8) X / f (9-15) Xlt; 1, 1.2, 0.5 lt; f (1-8) Y / f (9-15) Ylt; and 1.5. A first lens group formed by a plurality of spherical lenses, a second lens group formed by a plurality of cylindrical lenses, a third lens group formed by a plurality of spherical lenses and a fourth lens group formed by a plurality of cylindrical lenses are sequentially arranged from an object plane to an image plane along an optical axis; according to the camera lens, the light rays are comprehensively corrected, the horizontally-entering light rays are compressed, and the vertically-entering light rays are maintained, so that the width of a shot picture is increased, a picture with the proportion of 2.4: 1 is obtained, the full frame and high magnification of the camera lens are realized, and the camera lens is compact in structure and low in cost.

The invention relates to a laser beam shaping system and method based on an optical waveguide, and belongs to a beam shaping technology. Comprising a semiconductor laser, a fast axis collimating lens, a slow axis collimating lens, a beam expanding system, a focusing lens and an optical waveguide which are sequentially arranged from left to right, the fast axis collimating lens is a plano-convex cylindrical lens and is used for collimating the fast axis direction of the light beam; the slow axis collimating lens is a plano-convex cylindrical lens and is used for collimating the slow axis direction of the light beam; the beam expanding system comprises a front plano-concave cylindrical lens and a rear plano-convex cylindrical lens and is used for expanding the light beam width in the slow axis direction to be consistent with the light beam width in the fast axis direction; the focusing lens is a plano-convex lens and is used for focusing a light beam to the input end of the optical waveguide; the section of the input end of the optical waveguide is rectangular, the section of the output end is circular, and the optical waveguide is used for shaping rectangular light spots into circular light spots. The light beam is efficiently transmitted in the optical waveguide, and the light beam is gradually shaped into a circular light beam through the transition structure.

The invention discloses a coherent interference-based coaxial transceiving line scanning three-dimensional profile measurement system and method. The system comprises a low-coherence light source; the beam splitter is used for collimating light emitted by the low-coherence light source and then dividing the light into two paths; the measuring light is focused into a linear light beam through the cylindrical lens and is emitted to the surface of the to-be-measured sample, and the measuring light reflected by the surface of the to-be-measured sample returns to the beam splitter along the original path; the reference light is emitted to a reference mirror with a certain inclination angle and is reflected back to the beam splitter through the reference mirror; the measuring light reflected by the surface of the sample to be measured and the reference light reflected by the reference mirror are subjected to beam combination interference through a beam splitter and are imaged to enter a camera for interference pattern acquisition; the signal processing system is used for processing the interference patterns to obtain height distribution of the to-be-measured sample on a line field, and three-dimensional profile measurement of the to-be-measured sample is realized by transversely moving or transversely scanning the to-be-measured sample and overlapping the interference patterns measured at different positions. Therefore, high-efficiency measurement can be realized while the micro-nano precision is kept.

The invention provides a solution concentration real-time detection method based on cylindrical lens focusing offset, which comprises the following steps: step A, laser emitted by a laser diode is collimated into parallel light through a plano-convex lens, the parallel light is emitted into a sample cell through a glass window, and the sample cell is used for detecting the concentration of a sample; and then the light is emitted by the cylindrical lens and is imaged on the image sensor. B, the parallel light is imaged into a light spot on the image sensor after being emitted by the cylindrical lens, the image sensor is driven by the stepping motor to move, the minimum light spot is found, the moving distance of the image sensor is recorded, and the solution concentration change is inversed through the moving distance; by introducing a cylindrical lens light path amplification mechanism, the detection precision is remarkably improved, the temperature drift is effectively inhibited, and the defect of insufficient sensitivity in the prior art is overcome.

The invention relates to the field of agricultural equipment, and provides an optical weeding system and method. The optical weeding system comprises a base and a solar weeding device, the solar weeding device is arranged on the base and comprises a lighting assembly, a collimating lens, a light guide assembly and a cylindrical lens, the lighting assembly comprises a supporting frame and a Fresnel lens, and the Fresnel lens is arranged on the upper portion of the supporting frame. Sunlight is focused to a focus through the Fresnel lens to form a high-energy light spot, light output by the Fresnel lens is collimated through the collimating lens, and the focused light is output through the cylindrical lens to form a linear high-temperature light spot on the ground; solar energy of renewable clean energy is directly utilized to form a light knife for physical thermal cutting weeding, consumption of non-renewable energy sources is reduced, and the use cost is reduced; due to the fact that optical weeding is adopted, chemical reagents are not needed, and pollution to soil and water sources is avoided.

The invention discloses a nonlinear chirped fiber grating preparation structure based on speed regulation and control, and belongs to the field of laser technology and nonlinear optics. Comprising a light source displacement control scheme, a phase mask plate displacement control scheme and a grating inscribing and monitoring scheme. The optical, electrical and mechanical devices comprise a laser light source, a diaphragm, a plano-concave mirror, a plano-convex mirror, a cylindrical lens, an electric control displacement platform, a control program, a signal generator, a function editor, a precise displacement platform, an optical isolator, an optical circulator, a photosensitive optical fiber and an optical fiber analyzer. According to the non-linear chirp fiber grating preparation scheme based on speed regulation and control, the adjustable displacement speed is introduced while the uniform phase mask plate is used, flexible chirp regulation and control are achieved while simple and stable preparation is guaranteed, the preparation scheme of the non-linear chirp tube fiber grating is widened, and the preparation cost is reduced.

The invention discloses an air-cooled miniature slab laser based on double-end pumping, and belongs to the technical field of solid laser. Wherein the first conduction cooling single bar and the second conduction cooling single bar are arranged at the upper end and the lower end of the lath laser crystal in a staggered manner to form a double-end pumping structure; after the first fast axis collimation cylindrical lens and the second fast axis collimation cylindrical lens respectively collimate the fast axis directions of the first conduction cooling single bar and the second conduction cooling single bar, partial end surfaces are injected into the lath laser crystal; the first resonant cavity reflector and the second resonant cavity reflector are located at the left end and the right end of the lath laser crystal; the laser injected into the slab laser crystal passes through the resonant cavity mirror and then is subjected to multi-pass back-and-forth oscillation between the first resonant cavity reflector and the second resonant cavity reflector to reach the resonant cavity output cavity mirror. The output monopulse energy is greatly improved, the overall electro-optical efficiency is high, and the system compactness is high.

The invention discloses a one-dimensional ultra-wide field-of-view ultra-high spectral resolution dispersion coherent imaging spectrometer, which belongs to the technical field of spectral imaging, and comprises a first microlens array used for obtaining incident light of a one-dimensional ultra-wide field-of-view in a horizontal plane; the plurality of optical fibers are used for transmitting incident light of a one-dimensional ultra-wide field of view; the second micro lens array is used for collimating incident light from each optical fiber into broadband parallel light beams; the grating beam splitter interferometer is used for dispersing the broadband parallel light beams into a plurality of narrow-band parallel light beams with different propagation directions; the cylindrical lens is used for converging the two paths of coherent light of each narrow-band parallel light beam to a target block of the detector, and converging the narrow-band parallel light beams with different propagation directions to different target blocks respectively; and the detector is used for obtaining a continuous broadband ultra-high resolution spectrum according to the two paths of coherent light received by each target block. According to the invention, a one-dimensional ultra-wide field of view is obtained in a horizontal plane, and ultra-high spectral resolution can be obtained.

The invention discloses a system and method for generating, regulating and controlling a partially coherent space-time light field. The system comprises a pulse shaping assembly composed of a plurality of optical elements and an incident light source used for providing a completely coherent ultrafast pulse light field. An optical element in the pulse shaping assembly comprises a first blazed grating, a first cylindrical lens, a two-dimensional dynamic holographic modulator, a second cylindrical lens and a second blazed grating which are sequentially arranged in the light field propagation direction. The focal lengths of the first cylindrical lens and the second cylindrical lens are the same, and the distance between the adjacent optical elements is equal to the focal lengths of the first cylindrical lens and the second cylindrical lens; the two-dimensional dynamic holographic modulator is used for loading a specific complex amplitude modulation function to reconstruct the spatial-spectral characteristics of the light field. According to the invention, the two-dimensional space-spectrum function of the pulse is dynamically modulated, the generation of the partially coherent space-time wave packet is realized, and the amplitude and structure distribution of the space-time coherence can be designed and regulated as required.

The invention relates to the technical field of 3D display screens, in particular to a naked eye 3D liquid crystal display screen which comprises an outer shell and an inner shell located in the outer shell, a backlight layer is arranged on the innermost layer in the inner shell, and developing layers are sequentially arranged on the outer side of the backlight layer; the developing layer is formed by combining a 2D display layer and a 3D effect layer formed by arranging columnar perspective films so as to enhance the developing effect, and a touch layer and a protective layer are sequentially arranged on the outer side of the developing layer. The developing layer comprises a 2D display layer composed of a lower polaroid, a liquid crystal and an upper polaroid, and a 3D effect layer composed of a display panel and a cylindrical lens grating layer. According to the naked-eye 3D liquid crystal display screen, the 3D display effect can be enhanced, the interaction effect of the display screen can be improved, 3D display work can be better used, and meanwhile long-term efficient use of the display screen can be guaranteed.

The invention provides a multi-focus excitation confocal fluorescence microscopic imaging flow cytometry screening method. The method is characterized in that a laser beam generates three laser beams through a spatial light modulator, and the three laser beams are coherently superposed in a focal plane of a microscope objective to generate a two-dimensional optical lattice light field. And after the other laser beam is shaped by the cylindrical lens, linear laser optical tweezers are realized through the microscope objective, cells to be detected in an imaging detection area of the micro-flow chip are captured, and accurate active optical control on the rotation angle of the cells to be detected is realized. In a cell rotation process, a two-dimensional optical lattice light field rapidly scans in a focal plane at different angles, and a fluorophore in the cell is excited to generate a fluorescence signal. The confocal pinhole array installed at the position conjugate with the focal plane eliminates background fluorescence, a high-spatial-resolution fluorescence image of a three-dimensional structure in the cell is obtained, and cell screening is achieved. The method provided by the invention has the characteristics of high detection rate, high accuracy and the like, and has wide application prospects in the research fields of biology, medicine and life science.

A defect detection method based on laser measurement, which has a simple structure, achieves low cost and is convenient to use, and comprises: obtaining a detection device, wherein the device comprises a laser (1), a first cylindrical lens unit (2), a second cylindrical lens unit (3), a marking unit (4), an operation unit (5), a photoelectric probe (6), and a product conveyor belt (7), and using the first cylindrical lens unit (2) to convert point light emitted by the laser (1) into linear light, wherein the linear light is parallel light; obtaining a product (8) under test, using the product conveyor belt (7) to convey the product (8) under test for detection, using the product conveyor belt (7) to limit the product under test, and enabling the linear light to cover an area under test on the product under test for detection; and performing detection from the time when the linear light illuminates the area under test to the time when the linear light moves beyond the area under test.

A rapid optical tissue scanner includes: a light source unit for irradiating a sample with a light source beam; a cylindrical lens for transforming the light source beam into a light sheet; a sample mounting unit on which the sample is mounted; an objective lens disposed between the cylindrical lens and the sample mounting unit to irradiate the sample with the light source beam transformed into a light sheet; and a photographing unit for receiving an excitation beam, which is obtained by excitation from the sample, from the objective lens and photographing image information of the sample.

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 relates to a high-power optical fiber device refractive index dual-wavelength polarization holographic microscopic three-dimensional detection system based on a metasurface cylindrical lens and a working method, and belongs to the field of optical measurement. Comprising a first laser, a second laser, a first reflecting mirror, a first non-polarized beam splitting prism, a first half-wave plate, a beam expander, a polarized beam splitting prism, a second reflecting mirror, a first metasurface cylindrical lens pair, a Wollaston prism, a second half-wave plate, a third reflecting mirror, a second metasurface cylindrical lens pair, a sample optical fiber, a second non-polarized beam splitting prism and a first optical filter. The device comprises a first optical filter, a first CCD detector, a second optical filter, a second CCD detector and a computer. A metasurface cylindrical lens, a dual-wavelength polarization phase fusion interference detection method and a full-aperture aberration elimination filtering back projection refractive index three-dimensional reconstruction method are adopted, and the three-dimensional distribution detection precision and efficiency of the refractive index and welding defects of the high-power optical fiber device are further improved.

The invention provides a display unit based on LED sub-pixels and a display device. The display unit based on the LED sub-pixels comprises a pixel point array layer; the collimating lens layer is used for correspondingly arranging a collimating lens for each pixel point; the shading support is arranged on the surface of the collimating lens layer, and keels of the shading support are arranged between the pixel points and used for avoiding crosstalk between the pixel points; the cylindrical lens layer is arranged on the surface of the shading support, a cylindrical guide lens is arranged corresponding to the collimating lenses in the same column in a transverse arrangement mode, and the cylindrical guide lens comprises a lens for modulating emergent light to face the first direction and a lens for modulating emergent light to face the second direction. According to the structure, the emergent direction of emergent light is adjusted through the collimating lens according to the design of the lens, then the emergent direction of the emergent light is adjusted through the cylindrical lens, all the layers of structures can be achieved in batches in a 3D printing or injection molding mode, all the layers of lenses in the lens set are printed in a layered mode, parameters such as the focus, the focal length and the light emergent angle of the lenses are optimized, and therefore the light emitting efficiency is improved. The technical scheme is simple and easy to implement.

The invention provides a spliced detector flatness large-flux in-situ detection method which comprises the following steps: a light source emits a light beam which is compressed by a cylindrical lens, then is dispersed by a dispersion prism and respectively enters the edges of two adjacent detectors, and the two light beams are reflected by the surfaces of the detectors and then converge to generate dispersion stripes; a fixed difference calibration mode is adopted to calibrate stripe slope singularity caused by edge stripe variation in the dispersion stripe forming process; a band elimination filter is used for generating band elimination of a specific wave band in the dispersion fringes, and the channel spectrum is tested by analyzing the characteristics of the band elimination; the edge position of each detector is finely adjusted by using a dispersion prism, and the edge position of each detector is adjusted through deviation of a pupil position in combination with multi-point light emitted from one side of a wide-angle optical system by using an optical fiber interconnection system. According to the invention, the confocal and co-phase adjustment speed and precision of the spliced detector are greatly improved, and the regulation and control requirements of extremely high information flux and rapid convergence of a large-aperture system are met.

The invention discloses an image generation unit and device for realizing a naked eye 3D image, and the image generation unit comprises an LED array light source, a collimating cylindrical lens array, a compound eye cylindrical lens array, an intermediate image diffusion screen, an imaging cylindrical lens array unit, and a liquid crystal panel. Light emitted by the LED array light source sequentially passes through the collimating cylindrical lens array, the compound eye cylindrical lens array, the intermediate image diffusion screen, the imaging cylindrical lens array unit and the liquid crystal panel and then emits polarized light. The device comprises an image generation unit and a virtual image system. According to the image generation unit provided by the invention, the distribution of dense light sources is realized by using the compound eye cylindrical lens array and the middle image diffusion screen, and the technical problem that the size of an optical system is limited and the impression is influenced due to the overlarge size of light valve liquid crystal sub-pixels in a double-liquid-crystal scheme in the prior art is solved.

The invention provides an oligonucleotide coupling in-situ monitoring system and a detection method.The monitoring system is internally provided with a red light LED, an objective lens, a diaphragm, a doublet lens, a polaroid, a first cylindrical lens, a cylindrical prism, a flow cell chip, a second cylindrical lens, a first imaging lens, a second imaging lens and a CMOS camera in sequence in the light beam direction. The incident light path and the reflected light path are arranged at an angle, the flow cell chip and the cylindrical prism are subjected to refractive index matching through coupling liquid, reflected light spots are collected by analyzing the CMOS camera, the corresponding spectral resonance angle change of a detection area is obtained in real time, and then the conjugate change of the detection area is represented. The monitoring system utilizes the surface plasmon resonance effect to sensitively analyze the substance binding condition on the surface of a sensitive film layer, and in-situ characterization and multi-channel and array real-time detection of the oligonucleotide coupling process are achieved.

A display device includes a light-emitting panel comprising a plurality of pixels, wherein a given pixel comprises sub-pixels of at least two different colours (R, G, B, W) that are arranged sequentially along a first direction (A-B, H-I, M-N, K-L, Y-Z, U-V). The display device further includes a lenticular array arranged on an optical path of the light-emitting panel, the lenticular array including a plurality of lenticular lenses, wherein a longitudinal axis (X-Y) of a given lenticular lens aligns with the first direction. A processor is configured to generate drive signals for the plurality of pixels, based on a light field image to be displayed and to drive the plurality of pixels using the drive signals to display the light field image.

The utility model provides a particle counter which comprises a shell, a light channel used for light beam propagation and a cavity used for scattering are arranged in the shell, the light channel is communicated with the cavity, and a light source assembly used for emitting light beams, a light guiding assembly, a scattered light collecting assembly and a light collecting structure are sequentially arranged from the light channel to the cavity. A light beam enters the cavity after being guided by the light guiding assembly, the scattered light collecting assembly and the light collecting structure are combined with the shell at the position of the cavity, the light source assembly and the light guiding assembly are sequentially arranged on a light channel path along a light beam propagation path, and the light guiding assembly comprises an optical fiber and a lens set. The lens group comprises a first cylindrical lens, a second cylindrical lens and a second focusing lens. According to the utility model, the particle counter can obtain more homogenized flat-topped light beams, so that the light intensity of light spots in a photosensitive area is more uniform, and stray light in the process that the light beams are emitted from a laser to be removed by a light trap can be reduced at the same time.

The invention provides a high-speed and multi-dimensional spatial light field regulation and control device, which can realize high-speed regulation of multiple dimensions such as amplitude, phase, polarization and the like of a spatial light field. Comprising a pumping regulation and control system, a collimation focusing shaping system and a laser resonance system which are sequentially installed through a three-dimensional adjusting frame along a light path, and the three systems are located on the same horizontal optical axis and are vertically arranged. The pumping regulation and control system comprises a signal generator, a driving circuit and a pumping source; the collimating focusing shaping system comprises a collimating lens, a conical lens or a cylindrical lens and a focusing lens, the laser resonance system comprises a laser crystal and a laser resonant cavity, and the laser resonant cavity comprises a compact parallel plane cavity and an open type optical resonant cavity. Laser pulses with different amplitude characteristics can be output at different moments; laser pulses with different phase characteristics can be output at different moments; and laser pulses with different polarization characteristics can be output at different moments.

The invention relates to a double-grating external cavity spectrum beam combining device. The device comprises a semiconductor laser array light source, a fast axis collimating mirror, a slow axis collimating mirror, an optical path compensation device, a diffraction grating pair, a collimating lens and an output coupling mirror which are arranged in sequence. The optical path compensation device comprises a plurality of optical path compensation assemblies, and the optical path compensation assemblies are in one-to-one correspondence with sub light beams in the array light beams. An optical path compensation assembly is installed in an independent optical path transmission path of each sub-beam of the array beam, the outer cavity length and the beam combining efficiency of each sub-beam are changed through the optical path compensation assemblies, and specifically, the optical path of each sub-beam can be increased through the design that a reflection assembly installation platform drives a reflection assembly to move upwards, so that the beam combining efficiency is improved. Therefore, the length of the outer cavity is increased, the beam combining efficiency is improved, and the stability and precision of the system can be improved. And finally, the cylindrical lens can compensate optical errors introduced in a light beam transmission process, so that each sub-light beam is ensured to have good wavefront uniformity and phase consistency.

The invention belongs to the technical field of 3D display, and relates to a light field 3D display and a light field 3D display method. The light field 3D display comprises a directional light-emitting 2D display screen used for emitting a plurality of first light rays, a cylindrical lens array used for carrying out direction modulation on the plurality of first light rays emitted by the directional light-emitting 2D display screen, and an optical diffusion screen used for carrying out small-angle diffusion on the plurality of second light rays in the one-dimensional direction; the directional light-emitting 2D display screen, the cylindrical lens array and the optical diffusion screen are sequentially arranged in a stacked mode and used for conducting direction modulation and small-angle diffusion in the one-dimensional direction on directional light rays emitted by the directional light-emitting 2D display screen so as to reconstruct a complete discrete light field, and therefore continuous 3D images are obtained. The invention further discloses a light field 3D display method. The light field 3D displayer has the advantages of being large in visual angle, high in resolution ratio, large in depth range and the like, and mutual restriction of performance parameters of a traditional light field 3D displayer is relieved.

Disclosed in the present invention are a novel naked-eye 3D display device and a viewpoint stepless modulation method therefor. The device comprises a backlight source, a liquid crystal light valve, a cylindrical lens array and a liquid crystal panel which are sequentially arranged in a light propagation direction, wherein a light field emitted by the backlight source passes through the liquid crystal light valve, the liquid crystal light valve comprises a liquid crystal light valve grayscale and a light valve switch, the liquid crystal light valve grayscale and the light valve switch are controlled on the basis of the position of pupil of an observer, and a light source is simulated at different positions, such that the irradiation center of light emitted by the liquid crystal panel remains at the position of pupil of the observer; the light source passes through the cylindrical lens array to form a directional light source, and then passes through the liquid crystal panel to form a viewing image in a viewing area. According to the present invention, by controlling the liquid crystal light valve grayscale and the light valve switch, simulated light sources are formed at different positions, such that when the observer moves within the viewing area, two or more viewpoints can be observed all the time, and at each position, directional light beams can be accurately projected to the pupil of the observer, so as to avoid the problem of viewing flicker caused by the absence of light beam delivery when the pupil of the observer is positioned between two viewpoints.

The invention discloses a miniature ultraviolet spectrometer, which comprises a light source assembly, a miniature collimating lens group, a triangular prism, a parallel glass plate, a cylindrical lens and an area array detector, the light output end of the light source assembly faces the incident plane of the miniature collimating lens set, and the emergent plane of the miniature collimating lens set faces the first face of the triangular prism. The emergent surface of the triangular prism is in close contact with the incident surface of the parallel glass plate; the emergent surface of the parallel glass plate faces the incident surface of the cylindrical lens, and is used for refracting light rays close to a total reflection critical angle to form a plurality of light beams; the emergent surface of the cylindrical lens faces the receiving end of the area array detector; and the area array detector processes the received interference fringes to obtain spectral information. According to the micro ultraviolet spectrograph provided by the embodiment of the invention, the light path structure of the spectrograph is simplified, the simplified structure can reduce the loss of light in the transmission process, and more light can reach the detector, so that the accuracy of spectral information is ensured.

An optical system for a vehicle headlamp is provided, and includes at least one light source, at least one collimator positioned to receive light from the light source, a cylindrical lens array (CLA) positioned to receive collimated light from at least one collimator, and an irregular freeform cylindrical lens array (IFCLA) positioned to receive light from the CLA. The IFCLA includes an entry lens with numerous entry facets of irregular sizes and an exit lens with numerous exit facets. The irregularly sized entry facets on the entry lens focus light onto the middles of the respective exit facets on the exit lens.