1537 results about "Stray light" patented technology

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 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 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 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.

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 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.

The invention discloses a medical endoscope with an extinction anti-pollution structure, and relates to the technical field of endoscopes, the medical endoscope comprises an endoscope main body, the front end of the endoscope main body is provided with a camera module, and the periphery of the camera module is provided with an illumination light source for illumination, an outer sleeve and an extinction structural member; a hollow observation opening is formed in the center of the endoscope body in a penetrating mode, a light blocking sinking table used for blocking front direct light beams emitted by the illumination light source is arranged outside the hollow observation opening in a surrounding mode, and a deflection bevel edge used for diffraction deflection of light rays emitted by the illumination light source is further arranged outside the light blocking sinking table. Through the synergistic effect of physical shielding of the light blocking sinking table and diffraction deflection of the deflection bevel edge, front-side direct stray light of the illumination light source is cut off from the source, side-emitting and oblique-emitting light rays are deflected in a targeted mode, light spot and light fog pollution caused by diffuse reflection of the front end of a transparent guide sheath or a catheter is remarkably eliminated, and the imaging definition is remarkably improved.

The application provides an optical device and a near-eye display device. The optical device comprises a light guide and a reflecting surface. The reflecting surface is arranged obliquely relative to two parallel total internal reflection surfaces of the light guide to couple light into the light guide. First and second ends of the reflecting surface are arranged on opposite sides of the first total internal reflection surface. The first and second ends of the reflecting surface satisfy the following conditions: light within an incident angle range enters the optical device through the light incident end, is reflected by the reflecting surface once to the second total internal reflection surface, and spreads in the light guide; and edge light within the incident angle range that is incident obliquely to the second end of the reflecting surface is reflected by the reflecting surface twice and then reflected to a space between the first end of the reflecting surface and the first total internal reflection surface. By arranging the reflecting surface obliquely relative to the first total internal reflection surface, at least 50% of light within a maximum incident angle range is spread in the light guide and stray light is filtered, thereby improving the effect of the light guide in display implementation of the near-eye display.

A method for correcting nonuniformity of a near-eye display (NED) includes: obtaining a first plurality of images in response to a first test pattern being displayed by a display of the NED, each of the first plurality of images being obtained at a different location adjacent to an end of an optical path coupled to the display; extracting a distinguishing frequency component among the first plurality of images, the distinguishing frequency component being at least caused by stray light introduced by the optical path; and determining a correction scheme for correcting nonuniformity of the NED based on the distinguishing frequency component.

The invention discloses a stray light suppression device in industrial CR, which comprises an installation part and a third shading cylinder arranged at one end of the installation part, and is characterized in that a shading assembly used for filtering stray light is installed between the installation part and the third shading cylinder, and the shading assembly comprises an installation cylinder installed between the installation part and the third shading cylinder; when parts of different sizes are detected, the length of the light blocking rings can be flexibly adjusted according to the actual sizes of the parts, and for small parts, the light blocking rings can be shrunk, so that rays only cover the surfaces of the parts, scattering of the rays by the surrounding environment is reduced, and stray light is reduced; for large parts, a plurality of light blocking rings are stretched to ensure that rays can completely penetrate through the parts and are not excessively scattered, so that the propagation path and range of the rays are accurately controlled, unnecessary scattering and interference are reduced, and the situation that the CR detection accuracy is affected is avoided.

The invention relates to a double-light-path broadband multispectral optical imaging system, which is characterized in that broadband multispectral illumination and imaging are separated into a visible light band imaging light path and a near-infrared band imaging light path, so that the spectral width of the visible light band imaging light path and the spectral width of the near-infrared band imaging light path are reduced; the difficulty in correcting chromatic aberration in a broadband multispectral optical imaging system is reduced, and high-quality fundus multispectral images and color images are obtained; meanwhile, a polarization reflection elimination technology is adopted, a visible light wave band image and a near-infrared wave band multispectral image can be obtained at the same time only through the wave bands of visible light and near-infrared light, the elimination difficulty of stray light is reduced, and the accuracy of stray light elimination is improved. According to the design scheme of the visible light band imaging light path and the near-infrared band imaging light path, the coating range of the lens and the polarized light eliminating and reflecting device in the two light paths is narrower, the design is simplified, and the performance is better.

The invention relates to the technical field of virtual reality imaging devices, and discloses a moire-based virtual image display device, which comprises an image generation unit and a curved surface reflector, and is characterized in that light emitted by the image generation unit is reflected by the curved surface reflector to form an amplified virtual image; the image generation unit comprises a light source, an imaging unit and a grating which are sequentially arranged in the light propagation direction, the transverse size of an eye box of the virtual image display device is D, and the period of moire patterns formed by the imaging unit and the grating is larger than the eye box area size D by two times. By actively utilizing the moire effect, stray light energy is transferred to an effective visual area, the light utilization rate is improved, and the adverse effect of moire on an image is avoided; meanwhile, an existing peep-proof film is omitted, the material cost is reduced, and the adverse effect on definition caused by moire patterns generated by the peep-proof film and a pixel dual-period structure is avoided.

The invention relates to a coaxial four-mirror optical system, which comprises a primary mirror, a secondary mirror, a third mirror, a fourth mirror and an annular diaphragm, all the mirrors and the annular diaphragm are coaxially arranged, both the secondary mirror and the third mirror are provided with light through holes, light is reflected by the primary mirror and then is reflected by the secondary mirror, the third mirror and the fourth mirror in sequence, and the light is reflected by the annular diaphragm. And finally converging and imaging. In the design, through application of the annular diaphragm, edge aberration is reduced, and stray light suppression capability is remarkably enhanced at the same time. The coaxial four-mirror optical system has the advantages of being compact in structure, high in imaging quality, wide in applicability and the like, and is suitable for being applied to multiple fields of aerospace, biomedicine, industrial detection and the like.

The utility model belongs to the technical field of monitoring equipment, and relates to a defect monitoring and identifying device which comprises a workbench (1), a mounting column (2) arranged on one side of the workbench (1), and a camera (3), a lens (4), an annular light source (5) and a light shielding plate (6) which are coaxially arranged from top to bottom, a light through hole (61) is formed in the light shielding plate (6), a first connecting structure (7) is arranged on the mounting column (2) in a sliding manner, and a second connecting structure (8) is arranged on the first connecting structure (7). The annular light source (5) is rotationally connected with the first connecting structure (7); a second connecting structure (8) is arranged below the first connecting structure (7), the second connecting structure (8) is in sliding fit with the mounting column (2), and the shading plate (6) is fixedly connected with the second connecting structure (8). The defect monitoring and identifying device disclosed by the utility model can effectively inhibit stray light and improve the detection precision.

The invention discloses a manufacturing process of a COB (Chip On Board) process circuit board for photoelectric display. The manufacturing process comprises the following steps: performing constant-amplitude direct-current driving on a light-emitting chip array before injection of packaging glue to obtain full-board light field baseline data; the refractive index distribution of the packaging adhesive is regulated and controlled through multi-phase current pulses after the packaging adhesive is injected; forming a composite structure of a high-refractive-index chip interconnection interface and a low-refractive-index packaging surface by using Joule heat in a packaging adhesive crosslinking stage; the metal surface roughness is adjusted through nanosecond cosine pulses so as to control the plasma resonance characteristic; and finally, carrying out fine adjustment on the local refractive index by utilizing the interaction of the moving ions and the polar side chain. According to the technical scheme, stable refractive index distribution can be formed in the chip packaging structure through multi-physics field coupling regulation and control, formation of sub-wavelength stray light waveguides is effectively restrained, the problems of dynamic color cast and brightness flicker in an ultra-small pixel pitch COB display device are solved, and the optical performance consistency of the device is improved.

A cap having a closed end and one or more openings is attached to the tip of an optical Raman probe sensor. The cap serves to block stray light noise from entering the tip of the sensor. In this way, Raman spectra may be more accurate and consistent. Further, the cap may be permanently affixed or removably attached to the sensor. In some embodiments, a reflective surface may be included on the interior surface of the closed end of the cap. This reflective surface may reflect Raman scattering light toward the tip, enhancing the received signal by a factor of 2 to 100.

The invention relates to an optical imaging lens, which comprises a lens barrel, and an imaging lens group and a plurality of spacing elements which are arranged in the lens barrel, and is characterized in that the imaging lens group comprises a first lens, a second lens and a third lens; the plurality of spacing elements comprise a first spacing element and a second spacing element; the optical imaging lens meets the following conditions: HFOV is more than or equal to 66.89 degrees and less than or equal to 82.73 degrees; 5.63 < = D0m / TD * Fno < = 7.04; 0.94 < = f12 / (D2m-d2m) < = 3.54; wherein HFOV is half of the maximum field angle of the optical imaging lens, D0m is the outer diameter of the image side end of the lens barrel, and TD is the axial distance from the object side surface of the first lens to the image side surface of the third lens; fno is the aperture number of the optical imaging lens, f12 is the combined focal length of the first lens and the second lens, D2m is the outer diameter of the image side surface of the second spacing element, and d2m is the inner diameter of the image side surface of the second spacing element. According to the optical imaging lens, the problem of stray light can be effectively solved by constraining the second spacing element, and the optical imaging lens has the advantages of large field angle, slight stray light and the like.

An electronic device with less stray light is provided. The electronic device includes a display panel and an optical device. The optical device has a function of partly decreasing the luminance of light emitted from the display panel. For the optical device, a half mirror, a dark filter, or the like in which the transmittance is continuously decreased from the inside toward the outside can be used. With the use of such a component, stray light that is likely to be generated in a peripheral portion of a lens can be suppressed, and the visibility of an image displayed on the display panel can be improved.

The invention discloses a tunable narrow-band medium-wave infrared detection method based on up-conversion, and the method mainly comprises the steps: building a tunable narrow-band medium-wave infrared detection system, adjusting the power of signal light and pump light and the size of a beam waist, and controlling the temperature of a nonlinear crystal at a room temperature level to suppress the noise of a static system. A nonlinear crystal is designed through displacement of a multi-polarization period of a mechanical motion module, so that quasi-phase matching of signal light and pump light in a range of 3-5 microns is realized in different polarization period channels, sum frequency light of a visible wave band is generated, and flexible tuning of the signal light in a wide spectral range is realized; after stray light is filtered out, a sum frequency signal is received by a detector, a corresponding curve is obtained according to detected intensity information corresponding to each wavelength, and narrow-band response characteristics of different polarization periods are obtained.

To integrate an EUV collector, designed to guide EUV useful light and suppress stray light, into an EUV projection exposure system (1), which includes an EUV light source and illumination optics, a stray light suppression efficiency is first measured over a usable area of ​​the EUV collector. A low-suppression usable area section (43 optA high-impact target area (32) of the target area (42) is identified where the measured stray light suppression efficiency is lower than a given stray light suppression efficiency. Furthermore, a stray light exposure intensity is measured across a target area (42) in the useful light beam path at the location of an arrangement position of the useful area of ​​the EUV collector to be installed. A high-impact target area section (32) of the target area (42) is identified where the measured stray light exposure intensity is greater than a given stray light exposure intensity. The useful area is oriented relative to the target area (42) in an installation orientation in which the low-impact suppression target area section (43) is located. opt ) does not correspond to the high-impact target area section (32). The EUV collector is installed in the installation orientation. This results in an EUV collector with improved collector efficiency.

The utility model relates to the technical field of vehicle lamps, and provides a small-opening module gradually-changing type lens extinction structure, a vehicle lamp and a vehicle, n multi-order sawtooth patterns with different designs are sequentially arranged on the side walls of the two sides of a lens in the direction from back to front respectively, each multi-order sawtooth pattern comprises a side wall light emitting surface YnXn-1 and a sawtooth surface XnYn which are sequentially connected from back to front, each sawtooth surface XnYn is provided with a plurality of side wall reflecting surfaces with gradually-changed inclination angles, and the inclination angles of the plurality of side wall reflecting surfaces are gradually increased from back to front. By adopting the multi-step sawtooth pattern structure, a single total reflection surface is designed into a plurality of different surfaces and is designed into the structure with the gradient inclination angle, so that the total reflection probability of light rays is increased, missing stray light is prevented from passing through the light-emitting surface of the lens, the stray light elimination efficiency is increased, the occupied space is small, and the lens is more attractive.

The invention relates to a packaging structure of a micro display chip and a display device, and the packaging structure comprises a substrate, the surface of which comprises a display area and a non-display area; the electrode pads are located in the non-display area; and a plurality of through hole plugs located in the substrate, wherein one end of each through hole plug is electrically connected with the electrode pad. In AR near-to-eye display application, the light absorption structure can effectively absorb stray light returned from components such as an optical waveguide and the like, secondary specular reflection of the metal electrode pad on the non-display area is avoided, ghosting is prevented from being formed, and the imaging contrast ratio and the picture purity are remarkably improved. The light absorption structure is integrated in the packaging structure, and a stray light feedback path is cut off through a physical means on the premise that normal light emitting of a display area and electrical connection of an electrode pad are not affected, so that the optical performance of the micro-projection ray machine is improved, the final display effect is guaranteed, and the display effect is improved. Therefore, the technical problem of image quality degradation caused by high reflectivity of the non-display area is effectively solved.

The invention provides an adjusting method, an adjusting device and a detection device, which are used for improving the detection performance of the detection device. The method comprises the following steps: generating an adjusting voltage according to stray light received by a detector; adjusting the power supply voltage of the detector according to the adjusting voltage to obtain the target voltage of the detector; wherein the target voltage is used for adjusting the PDE of the detector. Wherein the power supply voltage and the target voltage are working voltages of the detector, the power supply voltage is a voltage directly provided for the detector by a power supply, and the target voltage is a voltage obtained after the power supply voltage is adjusted.