1894 results about "Stray light" patented technology

The invention provides an optical imaging lens, the optical imaging lens has eight lenses with focal power, and the optical imaging lens comprises a lens group, a spacing element group and a lens barrel group, the effective focal length f7 of the seventh lens and the interval EP67 between the sixth spacing element and the seventh spacing element in the direction of the optical axis of the optical imaging lens meet the following condition: f7 / EP67 is more than or equal to-8.25 and less than or equal to-6.82; the curvature radius R15 of the object side face of the eighth lens and the inner diameter d7m of the image side face of the seventh spacing element meet the condition that R15 / d7m is larger than or equal to 1.31 and smaller than or equal to 2.28. The multi-group optical imaging lens solves the problems that in the prior art, the rear end forming yield of the multi-group optical imaging lens is low, and stray light is serious.

The invention provides an optical imaging device, which comprises a lens group, a spacing element group and a lens barrel, the lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a sixth lens which are sequentially arranged at intervals from the object side to the image side of the optical imaging device, and the half Semi-FOV of the maximum half field angle of the optical imaging device and the numerical aperture fno of the optical imaging device meet the following conditions: 1lt; fno / tan (Semi-FOV) < = 1.25; the effective focal length f of the optical imaging device and the effective focal length f1 of the first lens meet the following formula:-2.3 lt; f1 / flt; -1.2,-1.2; the inner diameter d0s of the object side end face of the lens barrel, the inner diameter d1s of the object side face of the first spacing element and the effective focal length f1 of the first lens meet the following condition:-1.45 < = (d0s-d1s) / f1lt; and-0.85. The problem that in the prior art, an ultra-wide-angle and large-aperture optical imaging device is serious in stray light is solved.

The invention discloses a multi-point out-of-focus lens design optimization method for refractive error and a lens thereof, and relates to the technical field of optical design, and the method comprises the steps: carrying out the multi-refractive simulation optical test of the structure distribution characteristics of a to-be-optimized multi-point out-of-focus lens, obtaining the out-of-focus filling rate, aberration and astigmatism correction effect, then carrying out the partition aggregation, and obtaining the out-of-focus filling rate of the to-be-optimized multi-point out-of-focus lens. Obtaining a deviation area and a deviation characteristic of each diopter; constructing an optimization parameter library; performing compensation target analysis according to the deviation area and the deviation characteristic of each diopter to obtain an optical target parameter; and performing matching search in the optimization parameter library, determining a compensation parameter strategy, and performing structural design optimization on the structural distribution characteristics of the multi-point out-of-focus lens to be optimized. According to the invention, the technical problems of over-correction or insufficiency caused by defocus design unification in the prior art, serious stray light at the connection position of the edge of the multi-point micro lens and the circle of the lens and insufficient processing and assembling precision are solved, and the technical effect of improving the correction precision and visual stability of the lens is achieved.

The invention provides an optical lens. The optical lens comprises a lens barrel, first to seventh lenses, a third spacing element and a fourth spacing element, wherein the first to seventh lenses, the third spacing element and the fourth spacing element are arranged in the lens barrel; the center thickness CT4 of the fourth lens on an optical axis, the air spacing T34 of the third lens and the fourth lens on the optical axis, and the maximum thickness CP4 of the fourth spacing element meet the following conditions: 1.07 < = (CP4 + CT4) / T34 < = 1.5; the combined focal length f45 of the fourth lens and the fifth lens and the spacing distance EP34 between the third spacing element and the fourth spacing element meet the condition that f45 / EP34 is larger than or equal to 18.82 and smaller than or equal to 24.58. According to the invention, the problem of stray light caused by the optical lens in the prior art in order to meet the assembly stability is solved.

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of seven lenses, and the seven lenses are sequentially a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side; the at least one spacer comprises a second spacer and a third spacer; f3 / EP23 is more than or equal to-18.12 and less than or equal to-15.67; r6 / d3s is greater than or equal to 2.17 and less than or equal to 3.09. The problem that in the prior art, a seven-piece optical imaging lens meets the requirement for small size, and consequently middle stray light is increased is solved.

The invention relates to computer simulation, and discloses an internal stray light multi-physical field simulation method, device and equipment and a medium. The method comprises the following steps: generating a to-be-tested system model according to assembly data of an actual mechanical model; dividing grids for each structural surface of the to-be-tested system model, and performing finite element analysis solution according to thermal characteristics, stress characteristics, boundary conditions and loads to obtain a final refractive index steady-state value, a temperature field steady-state model and a deformation stress model; importing the temperature field steady-state model and the deformation stress model into ray tracing software; light rays are reversely emitted from imaging surfaces of the thermal field steady-state model and the deformation stress model through light ray tracing software, and a key optical surface is screened through reverse light ray tracing; and carrying out sampling processing on the key optical surface by adopting forward ray tracing, and carrying out forward ray tracing on the temperature field steady-state model and the deformation stress model so as to obtain an internal stray light simulation result and a path analysis result. Therefore, the accuracy of internal stray light analysis is improved.

The invention discloses a stray light gray value acquisition method, an automatic focusing processing method and an automatic focusing processing system, and relates to the field of automatic focusing. The method is applied to the microscopic automatic focusing device, and comprises the following steps: adjusting the distance between a microscope objective and a reflection point corresponding to light passing through the microscope objective, or the reflection angle of the light, so that the adjusted distance or reflection angle exceeds the focusing range of the microscope objective; or an extinction assembly is additionally arranged on the outer side of the microscope objective, so that the light penetrating through the microscope objective is eliminated; theoretical light spot areas formed by stray light on the surface of the first sensor at different axial height positions of the microscope objective are calculated; and gray values corresponding to theoretical light spot areas in the actual light spot images of the microscope objective at different axial height positions are extracted and used for correcting the light spot image of the object to be measured, so that the influence of stray light on a defocusing amount calculation result is reduced. Therefore, the influence of stray light reflected by the surface of the microscope objective on the defocusing amount calculation is reduced, and the accuracy of the defocusing amount calculation is improved.

The invention relates to the technical field of optical detection, in particular to a bright and dark field detection device and method.First illumination light emitted by a bright field light source is modulated through an illumination modulation assembly, then the first illumination light and second illumination light emitted by a dark field light source are guided to irradiate the surface of a to-be-detected sample, and the first illumination light is reflected by the to-be-detected sample to form bright field signal light; the second illumination light is scattered by the sample to be detected to form dark field signal light, and the bright field signal light and the dark field signal light are transmitted along a common light path and are mutually separated in space; an objective lens matched with the illumination modulation assembly receives and microscopically amplifies the bright field signal light and the dark field signal light; the imaging assembly receives the bright-field signal light and the dark-field signal light and carries out bright-field imaging and dark-field imaging. Through a bright and dark field common-path sub-view-field design, simultaneous imaging detection of bright and dark fields is realized; in addition, by arranging the illumination modulation assembly, the reflection phenomenon of illumination light on the periphery of the exit pupil plane of the objective lens is inhibited, and interference of stray light on imaging is eliminated.

The invention discloses a gasket structure capable of eliminating real-shot stray light, which comprises the following steps of: S1, designing a chamfering structure, namely, accurately setting the thickness of an ultra-thin gasket to be 0.022 / 0.033 mm, manufacturing the chamfering structure in an inner hole, and performing rigorous optical simulation and experimental optimization; s2, material selection and surface treatment are coordinated, material screening focuses on the characteristics of low reflectivity and high optical stability, and optical-grade polycarbonate has good optical transparency, low refractive index and excellent mechanical performance. The light propagation path is changed through unique design, and the influence of stray light on imaging is reduced to the maximum extent. By effectively eliminating the stray light, the image contrast of the imaging system is improved, the definition is obviously improved, more image details can be clearly presented, and the application scene requirement harsh for the imaging quality is met. The reduction of stray light interference helps to reduce the noise level of an optical system, improves the stability and reliability of the system, reduces the equipment fault and maintenance frequency caused by the stray light problem, and reduces the use cost.

The utility model relates to an LCOS (Liquid Crystal On Silicon) projection device, which comprises a light source module capable of emitting red, green and blue light beams, a polarization filter and an imaging lens which are sequentially arranged along a projection light path, an LCOS chip capable of modulating the polarization state of incident light is arranged on a projection light path between the polarization filter and the imaging lens, and an imaging lens group capable of imaging the incident light onto the LCOS chip is arranged on a projection light path between the light source module and the polarization filter. And a polarization layer capable of transmitting P polarized light and reflecting S polarized light is arranged on the polarization filter. Compared with a polarizing prism applied to a traditional LCOS projection light path, the LCOS projection light path has the advantages that through the arrangement of the polarizing filter and the polarizing layer which is arranged on the polarizing filter and can transmit P polarized light and reflect S polarized light, the LCOS projection light path has higher polarization efficiency, stray light is reduced, and optical efficiency is improved.

The invention discloses a positive sample data set construction method for astronomical image denoising application, relates to the field of image processing, and solves the problems that data sets for denoising and stray light removing tasks of astronomical images are relatively deficient and the processing performance needs to be improved at present. The method comprises the following steps: acquiring and cutting star maps at different time periods; identifying and positioning star points; generating and matching a double-triangle structure; and star map alignment and data set positive and negative sample selection are realized. The method is suitable for model training data construction of astronomical image denoising and stray light removal processing. In the subgraph cutting process, an unpolluted or lightly polluted area is preferentially reserved, the effectiveness and pertinence of data are improved, a double-triangle structure is constructed by accurately recognizing star points subsequently, star point matching and image alignment are carried out by utilizing a geometric hash algorithm, and finally, proper images are selected as positive and negative samples of a data set. Under the same astronomical observation condition, the method is better in denoising effect and higher in data processing efficiency.

The embodiment of the invention provides head-up display equipment, a vehicle and a stray light suppression method of the head-up display equipment. The head-up display device comprises an image generation unit, a diffusion assembly, a reflector group, a light-transmitting dustproof cover and a windshield which are sequentially arranged along a projection light path, the image generation unit is used for outputting projection light; the diffusion assembly comprises a base body, the base body comprises a surface A facing the image generation unit and a surface B back to the image generation unit, the surface A is provided with a microstructure array, and the surface B is provided with a phase retarder; wherein the surface A is configured to be capable of transmitting projection light in a first light path, and the surface A is configured to be capable of reflecting ambient light from the outside to the surface B and guiding the ambient light from the outside to the diffusion assembly in a second light path; the reflector group can be used for reflecting and amplifying projection light from the diffusion assembly; and a polarization element is arranged on the surface of the light-transmitting dust cover.

The invention provides an optical imaging lens. The optical imaging lens comprises a lens barrel, and a lens group and a spacing element group which are arranged in the lens barrel, the lens group sequentially comprises a first lens to a fifth lens from an object side to an image side along an optical axis direction, and the object side surface of a second lens is a concave surface; the spacing element group at least comprises a first spacing element; the first spacing element is positioned between the first lens and the second lens and is in contact with the image side surface part of the first lens; the air interval T12 of the first lens and the second lens on the optical axis and the maximum thickness CP1 of the first interval element meet the following condition: T12 / CP1 is more than or equal to 2.67 and less than or equal to 3.45; the curvature radius R3 of the object side surface of the second lens and the inner diameter d1m of the image side surface of the first spacing element satisfy the following relation:-2.76 < = R3 / d1m < =-2.14. The optical imaging lens solves the problem that stray light is serious in order to meet the assembly stability requirement in an optical imaging lens in the prior art.

The invention relates to the technical field of optical detection, in particular to an optical detection system and optical detection equipment. A first optical element for changing a bright field illumination light beam into first linearly polarized light is arranged in a light path of the bright field illumination light beam; a second optical element for changing the dark field illumination light beam into second linearly polarized light is arranged in a light path of the dark field illumination light beam, the polarization direction of the first linearly polarized light is different from that of the second linearly polarized light, and the first optical element is used for inhibiting the first stray light from being mixed into a transmission path of the first linearly polarized light; the first stray light comprises light which reaches the bright field illumination lens group after the second linearly polarized light is reflected and / or scattered; therefore, in the dark field detection process, the first stray light is prevented from being reflected by the bright field illumination lens group through the first optical element, the adverse effect of the first stray light on dark field imaging is reduced, the imaging quality and the imaging effect of dark field images are improved, and the detection efficiency and the detection accuracy are improved.

The invention provides a visual system. The visual system comprises a lens cone, a lens group and a spacing element group, the lens group and the spacing element group are arranged in the lens cone, and the lens group is composed of four lenses, a polaroid, a reflective polarizing element, a quarter-wave plate and a reflective element. The four lenses are sequentially a first lens with positive focal power, a second lens with negative focal power, a third lens with negative focal power and a fourth lens with positive focal power from the first side to the second side; f23 / d3s is more than or equal to-9.75 and less than or equal to-8.72; f / (CP1 + EP13) is more than 5.00 and less than 5.40. The problem that stray light is serious due to the fact that a four-piece type visual system in the prior art is provided with a bonding lens and a reflecting part to meet the requirement for structure compactness is solved.

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

The invention provides a structure and method for bonding plane mirrors and calibrating angles at the same time, and relates to the technical field of aviation, the structure comprises a frame, an infrared turn-back assembly, a flexible lens pressing ring, a mirror frame, a mirror and a pin gauge, the flexible lens pressing ring and the mirror frame are used for axially positioning the mirror, and the pin gauge is arranged in the radial direction of the mirror. When the glue is injected, the area and the thickness of the glue are accurately controlled, the tension generated on the mirror surface of the reflector after the glue is cured is uniformly distributed, the surface precision of the reflector is ensured, the arrangement of the cover plate can effectively prevent light leakage, stray light is prevented from influencing the imaging quality, and the technical problem that the surface precision is reduced when an existing reflector is installed is solved.

The invention relates to the technical field of image sensors, and discloses an illumination imaging method and device for mark recognition, and the device comprises an image sensor array which is used for carrying out the line-by-line exposure collection of target region marks, enabling each line of pixel points to be in an exposure state, and forming a target mark image; the imaging lens system is used for guiding reflected light of the target mark image to be transmitted to the image sensor array and reducing interference of other stray light received by the image sensor array except for illumination of an illumination system of the imaging device; the one or more groups of illumination systems are used for providing specific illumination for the target mark image in a specific window period, so that the exposure intensity of image pixel points in the window period is higher than that in a non-window period; a set of control and computing subsystems; a group of power supply systems; and a group of substrates. According to the invention, the problem of jelly effect of the rolling shutter image sensor is effectively solved, and further application of the rolling shutter image sensor in the field of mark identification is greatly expanded.

The utility model provides a laser radar optical machine and a laser radar. The laser radar ray machine comprises a transmitter, a transmitting optical module, a transmitting lens cone, a receiver, a receiving optical module and a receiving lens cone, and the transmitter is configured to emit a detection light beam; the transmitting optical module is arranged in the transmitting lens cone and is located on a light path of the detection light beam emitted by the transmitter; the receiver is configured to receive echoes formed by reflecting the detection light beams by an object; the receiving optical module is arranged in the receiving lens cone and is positioned on the light path of the echo; a first light leakage hole is formed in the barrel wall of the transmitting lens barrel, and / or a second light leakage hole is formed in the barrel wall of the receiving lens barrel. The first light leakage hole is formed in the barrel wall of the transmitting lens barrel, and / or the second light leakage hole is formed in the barrel wall of the receiving lens barrel, so that stray light can be emitted from the first light leakage hole / the second light leakage hole, and interference of the stray light to the laser radar is reduced.

The invention discloses a display light color detection system, and relates to the technical field of low-brightness display light color detection, and the system comprises a dynamic modulation module which is configured to carry out the high-frequency pulse modulation of a dark-state signal of a detection object, and is used for enabling the dark-state signal to carry a modulation component of a characteristic frequency; the time sequence division acquisition unit comprises a high-speed optical shutter assembly and a detector, and the high-speed optical shutter assembly synchronously switches the on-off state of an optical path according to the characteristic frequency; according to the invention, through high-frequency pulse modulation of dark state signals, time-sequence-divided acquisition of noise and signals and time-frequency domain combined decoupling, traditional hardware limitation is broken through, ultra-low brightness signals and stray light interference are effectively separated, 0.01 cd / m < 2 >-level high-precision detection is realized, the detection efficiency is improved by more than 7 times, and the misjudgment rate is significantly reduced. The problems of missing detection of a novel display technology and the yield of an automatic production line are solved, and an active coding-time sequence calibration-cross-domain cooperation framework has remarkable innovativeness and industrial value.

An optical system and a display device, the optical system comprising: a lens assembly comprising at least two lenses, the at least two lenses comprising a first surface, a second surface, a third surface and a fourth surface arranged in sequence along an optical axis direction of the lens assembly; the transflective film is arranged on the side, away from the third surface, of the fourth surface; the polarization reflection layer is arranged on the side, away from the fourth surface, of the third surface; the phase delay film is located on the side, away from the transflective film, of the fourth surface; the adhesive layer comprises an adhesive layer lens; wherein at least one of the first surface and the second surface is a Fresnel surface, and the glue layer is glued between the second surface and the third surface. The glue layer glued between the second surface and the third surface comprises the glue layer lens, light rays are refracted through the glue layer lens and the Fresnel surface, chromatic aberration can be corrected, the light rays do not pass through the Fresnel surface in the returning process, and stray light is reduced.

The present invention provides an optical imaging lens. The optical imaging lens includes a lens barrel, a lens group, and a spacer element group. The lens group is composed of six lenses, which are, in sequence, a first lens with a negative optical power, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the spacer element group includes a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, and a fifth spacer element; 3.2 < fno × tan(Semi-FOV) < 3.5 is satisfied; 0.5 < CT1 / CT2 < 0.75 is satisfied; -11.5 < (EP12 - f2) / (EP01 - f1) < 2.6 is satisfied. The present invention solves the problem that in the prior art, for a six-piece optical imaging lens, the internal reflection stray light of the front-end lens is serious due to meeting the wide-angle requirement.

The present application discloses a virtual image display device and a vehicle, belonging to the field of display technology. The virtual image display device includes an image generation unit, an occlusion unit, an optical path folding unit, and an imaging unit. The image generation unit is configured to emit image light. The occlusion unit is located on the optical path between the image generation unit and the optical path folding unit, and the occlusion unit is configured to transmit at least part of the image light from the image generation unit to the optical path folding unit, and block at least part of the stray light from the optical path folding unit from being emitted to the optical path folding unit. The optical path folding unit is configured to direct the image light from the occlusion unit to the imaging unit. The imaging unit is configured to form a virtual image based on the image light from the optical path folding unit. This virtual image display device is beneficial to eliminating ghost images.

The utility model relates to a 3D electronic endoscope which comprises a hard tube and a front end base arranged at the front end of the hard tube, an inclined face is arranged at the front end of the front end base, a lens light window is arranged in the middle of the inclined face, and light source light windows are arranged on the upper side and the lower side of the lens light window respectively. An imaging module and an optical fiber module are arranged in the front-end base, the imaging module comprises two objective lenses which are distributed left and right and have parallel main optical axes, and the lens ends of the two objective lenses directly face a lens light window; the pair of optical fiber modules is distributed on the upper side and the lower side of the imaging module, and the optical fiber end faces of the pair of optical fiber modules are tightly attached to the light source light window. According to the utility model, the structure design is reasonable, the independent imaging module is matched with the two optical fiber modules, the binocular focusing precision is improved, the stray light is reduced, and the image quality is improved, so that the undesirable phenomenon that people are dizzy due to the binocular focusing precision and the stray light directly or indirectly is reduced or eliminated.

The invention provides an optical lens. The optical lens comprises a lens barrel, a lens group and at least one spacer, the lens group and the spacer are arranged in the lens barrel, the lens group is composed of five lenses, and the five lenses are a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence; the at least one spacer comprises a first spacer; the curvature radius R1 of the object side surface of the first lens and the outer diameter D1s of the object side surface of the first spacer meet the condition that R1 / D1s is greater than or equal to 0.37 and less than or equal to 1.26; the inner diameter d1s of the object-side surface of the first spacer, the center thickness CT1 of the first lens on the optical axis, and the radius of curvature R2 of the image-side surface of the first lens satisfy 3.80 < = d1s / (CT1 * R2) < = 7.82. The five-piece optical lens solves the problem that stray light at the front end is increased due to the fact that a five-piece optical lens in the prior art meets the bearing stability of the first lens.

The utility model relates to a polarized lens cut-in, cut-out and autorotation mechanism based on an optical camera, and aims to solve the problem that the imaging quality is influenced by stray light of the optical camera in a photoelectric pod in a complex environment and ensure the light incoming amount of the camera in a general environment. When the polarized lens cutting-in and cutting-out device works, the cutting-in and cutting-out motor drives the cutting-in and cutting-out driving gear to rotate so as to drive the target wheel and the self-rotating lens cone and the flat lens which are arranged on the target wheel to rotate, so that cutting-in and cutting-out of the polarized lens are realized; when the polarized lens is cut into a light path, the rotation driving motor drives the rotation driving gear to rotate so as to drive the transmission gear and further drive the rotation lens cone and the polarized lens installed in the rotation lens cone to rotate, thereby realizing rotation of the polarized lens.

The invention relates to a method for extracting the mass center of a laser spot image based on laser size and gray scale, and relates to the technical field of digital image processing, optical testing and Matlab programming. The method comprises the following steps: step 1, obtaining a fourth grayscale image; 2, processing the generated fourth gray level image, and solving an X coordinate value and a Y coordinate value of the mass center of each image in the test time period; and step 3, obtaining a final centroid coordinate value. According to the method for extracting the mass center of the laser spot image based on the laser size and the gray level, the influence of noise points, stray light and the like on the overall measurement result is reduced to the maximum extent, meanwhile, the numerical image processing process is clear in logic and reasonable in analysis, the actually obtained result meets the expectation, data calculation is simple, and the processing process is efficient and rapid. And adopted data processing software is also universal and common, and is easy to popularize.

The invention relates to a star map stray light processing method based on multidirectional gradient, belongs to the technical field of space situation awareness, and solves the technical problems of low processing speed and inaccurate target edge information processing when the existing method is used for processing stray light under a complex illumination condition. Comprising the following steps: performing multidirectional gradient calculation on each pixel point of an original star map image containing stray light to obtain a multidirectional gradient value of each pixel point, and performing normalization processing to obtain a normalized gradient image; carrying out adaptive threshold segmentation on the normalized gradient image to obtain a binary image; performing morphological closed operation on the binarized image to obtain a contour image after the closed operation; and carrying out contour filling on the contour image after the closed operation, and carrying out mask processing to obtain a pure star map image with a reserved target area. The influence of strong stray light on target detection is effectively eliminated, and the precision and robustness of star map image target positioning are improved.

The invention relates to the technical field of airborne wind power measurement, and discloses an airborne wind measurement laser radar method and system. The method comprises the following steps: generating a scanning time sequence identifier and a path correction mark structure through scanning beat synchronization and stray light shielding processing; executing time-frequency demodulation and quality gating based on the back scattering signal to generate an observation wind speed initial value sequence; performing time alignment and motion compensation in combination with inertial navigation data, and generating a wind speed vector grid fragment through spatial interpolation and scanning geometric mapping; and finally, generating a configuration updating instruction structure through coordinate alignment and grid splicing. According to the invention, the precision and the anti-interference capability of wind field measurement in an airborne environment are effectively improved, and the data reliability and the system stability under a complex meteorological condition are remarkably enhanced through multi-source data fusion and a self-adaptive compensation mechanism.