909 results about "Imaging lens" patented technology

The invention discloses a method for detecting residual stress of a birefringent crystal, which is characterized by comprising the following steps of: fixing a sample to be detected on a sample loading table; the imaging lens is used for acquiring light rays which sequentially penetrate through the polarizer module, a sample to be detected on the sample loading table, the analyzer module and the camera module in four states in three states that polarization axes of the polarizer module and the analyzer module are mutually orthogonal and a polarization angle is gradually increased by 30 degrees, and in a state that the polarizer module and the analyzer module are in parallel, and the imaging lens is used for acquiring the light rays which sequentially penetrate through the polarizer module, the sample to be detected on the sample loading table, the analyzer module and the camera module in the four states; collecting a light intensity matrix set through a camera module; acquiring a reference light intensity matrix through normalized linear superposition, and performing pixel-by-pixel operation with the reference light intensity matrix on the basis of the first light intensity matrix, the second light intensity matrix and the third light intensity matrix to acquire corresponding phase delay matrixes; eliminating natural birefringence and updating a phase delay matrix by deducting respective overall average phase delay amount pixel by pixel; through pixel-by-pixel weighted stacking, isogradient lines are eliminated, and distribution information of residual stress is obtained.

The invention discloses a reflector structure for a projection imaging lens, which comprises a reflector body, the reflector body is placed in an optical projection imaging lens with more than two lenses, and the reflector body comprises a middle light-passing area, a middle light-passing area and a middle light-passing area, so that light of the optical projection imaging lens is emitted through the middle light-passing area to become direct emergent light; the upper end of the first reflecting region is small and the lower end is large; the upper end of the second reflecting region is large and the lower end is small; the optical projection imaging lens is vertically placed, the light source or the image source is arranged below the optical projection imaging lens, and the lens is arranged above the optical projection imaging lens; the reflector body is configured to be matched with a circular projection imaging lens in rotational symmetry or a projection imaging lens in a non-rotational symmetry structure. The surface brightness and uniformity of the light-emitting surface of the projection lens are improved.

An imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, sequentially disposed at intervals from an object side of the imaging lens system. The imaging lens system satisfies 1.5<Nd5<1.6, 30<V5<50, and TTL / 2IH<0.730, where Nd5 is a refractive index of the fifth lens, V5 is an Abbe number of the fifth lens, TTL is a distance from an object side surface of the first lens to an imaging plane, and 2IH is a diagonal length of the imaging plane.

The invention discloses a field-of-view self-stabilization and self-adjustment hyperspectral camera system and a control method, and relates to the technical field of hyperspectral imaging. The system comprises a first imaging lens group, a movable slit, a two-dimensional linear driver, a slit outer layer light shield, a collimating lens group, a light splitting element, a second imaging lens group, an area array image sensor, an attitude sensor and a control acquisition circuit. Angle disturbance is obtained in real time, two-dimensional compensation displacement of the slit is calculated to drive the slit to move reversely, field-of-view collection is kept basically constant, collection is triggered according to a set rhythm, slit position and attitude data are recorded synchronously, and the pre-calibrated slit position and mapping of original coordinates and ideal coordinates are combined, so that field-of-view collection is completed. Geometric transformation and resampling dynamic correction are carried out on view field inclination aberration and spectrum bending aberration generated along with slit position changes, the environmental adaptability and reliability are improved, a hyperspectral data cube with accurate space coordinates and a stable spectrum curve is output, and the method is suitable for unmanned aerial vehicle-mounted hyperspectral remote sensing.

The invention discloses a wafer nanoscale defect detection system and method based on multi-mode and feature fusion, the system comprises a multi-band LED light source group, a CMOS camera, a telecentric imaging lens and a displacement platform, the multi-band LED light source group is arranged at the uppermost part, and the CMOS camera, the telecentric imaging lens and the displacement platform are sequentially arranged below the multi-band LED light source group; the multiband LED light source group comprises an angle gt; an incident light LED with the angle of 70 degrees, an incident light LED with the angle of 10-30 degrees, a coherent light source and a phase shift module; the CMOS camera shoots a wafer picture, and the telecentric imaging lens captures details on the surface of the wafer; the displacement platform bears the wafer and carries out displacement. According to the method, the limitation of two-dimensional detection is broken through, and on the premise of not sacrificing the detection speed, high-sensitivity, high-precision and quantifiable online automatic detection of fisheye, pinhole and segment difference defects is realized through an innovative optical system design, a quasi-three-dimensional morphology reconstruction technology and an advanced deep learning network architecture.

The invention discloses a calibration method of a polarization focal plane imaging system and an imaging system, relates to the field of photoelectric imaging and remote sensing detection imaging, and solves the problems of low correction efficiency and difficulty in correcting a system with a changed polarization state in the conventional polarization error correction technology. According to the calibration method, a plurality of coding patterns and corresponding polarization modulation matrixes are obtained based on the collected uniform light field and serve as calibration results. The polarization error correction method comprises the steps of obtaining an observation intensity vector based on a target scene; a corresponding polarization modulation matrix is obtained based on the coding pattern according to a coding polarization modulation matrix lookup table, and then a down-sampling Stokes vector after polarization error correction is obtained; and completing the correction of the polarization error through an imaging reconstruction method. A polarization focal plane imaging system comprises an imaging lens, a DMD digital micromirror array coding module, a focal plane DoFP polarization detector and an imaging reconstruction module. The method is suitable for the fields of remote sensing detection, target identification, environment monitoring and the like.

The invention provides a light field three-dimensional reconstruction method and system based on a microlens array and polarization modulation, and a medium, and the method comprises the steps: carrying out the polarization coding of light rays at different angles at an exposure moment based on a polarization modulator, and obtaining different polarized light information; focusing light to an imaging surface based on an imaging lens, and recording view images of different polarized light information based on a micro-lens array; based on the polarization characteristics of the view angle image, view angle decoding is carried out on the view angle image based on the polarization characteristics, and light field images of multiple view angles are obtained; preprocessing the light field images of the multiple visual angles to obtain preprocessed images of the multiple visual angles; analyzing the light intensity distribution information based on the preprocessed image to obtain light field data, and reconstructing the light field image based on a reflective projection algorithm to obtain a reconstructed image; multi-view image capturing is achieved through multi-state polarization coding, light intensity analysis is conducted on multi-view light field images, three-dimensional reconstruction of a high-speed dynamic scene is achieved, and the image reconstruction precision is improved.

An imaging lens system includes a first lens, a second lens, a third lens having negative refractive power, a fourth lens, a fifth lens, and a sixth lens, disposed in order from an object side in a direction of an imaging plane, wherein one or more of the first to sixth lenses has a refractive index of 1.8 or greater, and has a refractive index temperature coefficient (10−6 / ° C.) of 3 or greater.

Imaging lens arrangement (100), comprising: an optical plastic element (110), comprising: an incidence surface (111), wherein an imaging light enters the optical plastic element (110) through the incidence surface (111); a reflective surface (112), wherein the imaging light changes direction through the reflective surface (112); an exit surface (113), wherein the imaging light exits the optical plastic element (110) through the exit surface (113); and at least one connecting surface (130) which is used to connect the incident surface (111), the reflecting surface (112) and the exit surface (113), wherein the at least one connecting surface (130) comprises: a sprue (131) which is arranged on the at least one connecting surface (130), and wherein the sprue (131) is raised relative to an adjacent section (134) of the at least one connecting surface (130); a divergent nozzle surface (132) connected to the sprue (131) and the adjacent section (134), wherein the divergent nozzle surface (132) diverges from the sprue (131) and extends in a direction of the adjacent section (134); and a gate remnant (133) which is arranged on a surface of the sprue remnant (131), wherein a contour of the gate remnant (133) is linear and the gate remnant (133) extends over the surface of the sprue remnant (131); wherein, when projected along a direction in a front view of the adjacent section (134) of the at least one connecting surface (130), a projection surface of the divergent nozzle surface (132) is As, a projection surface of the sprue residue (131) is Ag, and the following condition is met: 0.08 ≤ As / Ag ≤ 0.68.

The invention relates to an optical system. The optical system sequentially comprises a lens group, a diaphragm and an imaging lens from an object side to an image side along an optical axis direction, the lens group comprises a first lens group with positive focal power and a second lens group with positive focal power, the first lens group comprises five lenses, the second lens group comprises at least seven lenses, and the optical system meets the condition that FG1 / f1 is greater than or equal to 1.95 and less than or equal to 7.44; tDG1 / T56 is more than 0.65 and less than 2.00; wherein FG1 is the combined focal length of the first lens group, f1 is the effective focal length of the first lens, TDG1 is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis, and T56 is the air interval between the fifth lens and the sixth lens on the optical axis.

The application discloses a laser cavity diagnosis device and method based on double-frame delay synchronization phase shift, which comprises an excitation module and a detection module; the excitation module comprises a first laser, a first 1 / 2 wave plate, a polarization beam splitter prism, a beam splitter, an energy meter, a convex lens and a water tank; the detection module comprises a second laser, a beam expander lens group, a second 1 / 2 wave plate, a second polarization beam splitter prism, a third 1 / 2 wave plate, a first reflector, a second reflector, a fourth 1 / 2 wave plate, a third polarization beam splitter prism, a third reflector, a fourth polarization beam splitter prism, a first 1 / 4 wave plate, a first imaging lens, a first micro-polarization camera, a second 1 / 4 wave plate, a second imaging lens and a second micro-polarization camera. The application introduces a double-frame delay method in the traditional synchronous phase shift interference, overcomes the defects of the existing cavity detection technology, and realizes the observation of the instantaneous phase change in a single cavity pulsation period.

In a biometric identification system, a transparent body can have a curved platen surface. The curved platen surface can be removably contacted by an anatomy of a user. The anatomy can have an anatomical pattern. An illumination source can illuminate the curved platen surface with an illumination beam. The illumination beam can propagate away from the curved platen surface as a return beam having a beam pattern shaped to correspond to the anatomical pattern. An imaging lens can focus the return beam to form a real image of the beam pattern at an image location. Field-curvature-correcting sensor optics can include a sensor. The sensor can sense the real image of the beam pattern at the image location. The field-curvature sensor optics can include a planar sensor and an image-flattener lens. The field-curvature sensor optics can include a curved, convex sensor.

The invention provides a lens optical fiber array coupling system and a chromaticity measurement system and method, and belongs to the field of chromaticity measurement, and the lens optical fiber array coupling system comprises an imaging lens which is used for obtaining incident light of an object to be measured and guiding the incident light to an array optical fiber; the end face of the array optical fiber is located on the first image plane of the imaging lens, the normal of at least part of the optical fiber end face in the array optical fiber has a deflection angle relative to the normal of the first image plane, and the deflection angle is angle deflection performed by taking the main light ray of the light received by the corresponding optical fiber position as a target reference; and the imaging spectrometer is used for receiving the light information sent by the array optical fiber. By setting the deflection angle of the array optical fiber, the effective receiving area of the optical fiber is maximized, and the change of the transmission efficiency of light of different wavebands is avoided.

An imaging lens driving module includes a lens carrier, an imaging lens assembly, a first frame element, a variable aperture element, a circuit board, a flexible wire plate, a first driving element and a second driving element. The imaging lens assembly is disposed in the lens carrier. The imaging lens assembly is disposed on a first rail of the first frame element via a first ball element. The variable aperture element is disposed on the lens carrier. The circuit board is disposed on an image side of the imaging lens assembly. The flexible wire plate is coupled to the circuit board and the lens carrier. The first driving element is for rotating blades of the variable aperture element for enlarging or shrinking an aperture hole. The second driving element is for driving the lens carrier to move along a first direction.

The invention relates to an optical system. The optical system sequentially comprises a lens group, a diaphragm and an imaging lens from an object side to an image side along an optical axis direction, the lens group comprises a first lens group with positive focal power and a second lens group with positive focal power, the first lens group comprises five lenses, the second lens group comprises eight lenses, the first lens and the second lens are glued, the third lens and the fourth lens are glued, and the optical system meets the conditions that F34 / F12 is larger than or equal to 3.88 and smaller than or equal to 7.10, and F78 / (CT7 + CT8) is larger than-3.65 and smaller than-2.95; wherein F34 is the combined focal length of the third lens and the fourth lens, F12 is the combined focal length of the first lens and the second lens, F78 is the combined focal length of the seventh lens and the eighth lens, CT7 is the center thickness of the seventh lens on the optical axis, and CT8 is the center thickness of the eighth lens on the optical axis.

The objective of the invention is to provide the imaging lens and the imaging device, and the imaging lens and the imaging device can achieve the lightening and thinning of the body of the imaging device, and can shorten the shortest shooting distance. According to the transmission sequence of light from an object side, the imaging lens provided by the invention sequentially comprises a diaphragm; the lens group comprises at least one lens with positive focal power and at least one lens with negative focal power; and the reflection light guide element is used for emitting the light to the imaging element. One of the at least one lens with the positive focal power is made of a glass material, the reflection light guide element is provided with a plurality of reflection surfaces, and a light path is reflected on the plurality of reflection surfaces for multiple times.

A material inspection system includes a supporting structure, a conveying portion, an image-taking portion, a driving portion, and a volume calculation module. The conveying portion is provided on the supporting structure and can convey a material from a first end to a second end of the conveying portion. The image-taking portion has an imaging lens whose field of view encompasses at least a portion of the moving path of the material on the conveying portion. The driving portion is located on the conveying portion and can drive the material into rotation so that the image-taking portion can take a plurality of depth images of different portions of the material while the material is in rotation. The volume calculation module extracts the depth information in each depth image and feeds the depth information into a deep learning model to calculate the volume of the material.

The first aspect of this invention provides a polarized illumination system for providing illumination light to biological tissue, comprising at least one laser, a lens, and a polarization-maintaining fiber. The second aspect provides a polarized imaging system for receiving light reflected or scattered by biological tissue after illumination, comprising an analyzer, an imaging lens, and a photosensitive device. The third aspect provides another polarized imaging system, comprising an imaging lens, a polarizing beam splitter, and a photosensitive device. The fourth aspect provides an endoscope system comprising the aforementioned polarized illumination system and polarized imaging system. This invention utilizes the different depolarization characteristics of scattered light at different depths to achieve separate imaging of specular reflection light, surface scattered light, and deep scattered light, greatly improving the visibility of mucosal surface and deep mucosal information, and significantly enhancing the visibility of various mucosal lesions.

The application provides a satellite-borne multi-viewing-angle polarization spectrum imaging system for aerosol optical parameter measurement, and belongs to the technical field of optical imaging. The system is loaded on a satellite platform and comprises a telescope objective, a multi-slit assembly, a light-splitting prism, a collimating lens group, a plane grating group, an imaging lens group, a depolarization light-splitting prism group, a polaroid group and a detector group. The system is based on static multi-viewing-angle synchronous observation design, and realizes high-precision detection of aerosol optical parameters through multi-viewing-angle, hyperspectral and full-polarization multi-dimensional information fusion.

The utility model discloses an ultra-wide-angle prime lens with large light transmission and high resolution and electronic equipment. The lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object plane to an image plane along an optical axis. The first lens has negative diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a concave surface; the second lens has negative diopter, the object side surface of the lens is a concave surface, and the image side surface of the lens is a convex surface; the third lens has positive diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a plane or a convex surface; the fourth lens has positive diopter, the object side surface of the lens is a convex surface, and the image side surface of the lens is a convex surface. According to the utility model, the effective focal length is 2.53 mm, the F is 1.6, and the distortion result is 1t; the ultra-wide-angle imaging lens is small in size, large in clear aperture, confocal in day and night, high in resolution and excellent in performance in high and low temperature environments.

1. The name of the design product: the thermal imaging lens of the driving recorder (P2). 2. The use of the design product: the thermal imaging lens for the driving recorder. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The imaging lens system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens sequentially disposed along an optical axis of the imaging lens system from an object side of the imaging lens system toward an imaging plane of the imaging lens system, in which the second lens has a positive refractive power and is made of a glass material, and the fifth lens is made of a plastic material, the imaging lens system satisfies a conditional expression f number lt; the f number is the f number of the imaging lens system.

The application provides an optical imaging lens group, comprising a lens barrel, a first lens to a fifth lens accommodated in the lens barrel and a plurality of spacers, wherein the spacer located on the image side of the i-th lens and in contact with the image side surface of the i-th lens is the i-th spacer, i is selected from 1, 2, 3 and 4, the ratio of the curvature radius R8 of the image side surface of the fourth lens to the curvature radius R7 of the object side surface of the fourth lens is greater than zero and satisfies |R7|>|R8|, the air interval T34 of the third lens and the fourth lens on the optical axis of the optical imaging lens group, the central thickness CT4 of the fourth lens on the optical axis, and the distance EP34 between the image side surface of the third spacer and the object side surface of the fourth spacer along the optical axis satisfy (T34+CT4) / EP34<5.0. The application solves the problem of poor assembly stability of the optical imaging lens group in the prior art.

The application discloses a kind of laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spot and speckle signal under the condition of not relying on expensive refrigeration system by optimizing optical structure and control strategy.The device includes imaging lens, lens electric control module, liquid crystal tunable filter module, ND filter wheel and its driving mechanism, two-dimensional image sensor, main control unit, three-axis acceleration sensor, PC host and the screen to be measured.The noise calibration piece pre-stored in the ND filter wheel is used to collect noise data in real time before each measurement, and noise subtraction is carried out before the filter switching to improve the timeliness and accuracy of data correction;At the same time, the integrated three-axis acceleration sensor is used to monitor vibration, and when vibration exceeding the preset threshold is detected, it is determined that the current collected data is invalid and automatically triggers re-sampling.The application has compact structure and low cost, and is suitable for laser display, projection calibration and high-brightness light source detection and other fields.

The invention provides an ultra-short and ultra-strong laser pulse measuring device and an optical time-space coupling distortion measuring and data processing method based on the device. The device comprises an ultra-short and ultra-strong pulse laser system to be measured, an attenuation module, a beam splitter, a spectral phase measurement unit, a reflector, a micro-lens array, a binary intensity coding plate, a lens, a precision displacement platform, a dispersion element, an imaging lens and a CCD (Charge Coupled Device). The device and the method can be applied to quantitative measurement of ultrashort pulse light space-time coupling distortion.

The invention provides an F-P spectral imaging system and method, and belongs to the technical field of spectral component measurement, and the system comprises a front lens which is used for collecting light energy and converting the light energy into emergent light meeting the limitation of the clear aperture of an F-P interferometer; the annular band optical filter comprises a central area and a plurality of concentric annular areas surrounding the central area, the bandwidth of each area is the same as the free spectral range of the F-P interferometer, and the annular band optical filter is used for eliminating level aliasing in emergent light of the front lens; the F-P interferometer is used for carrying out wavelength selection on emergent light of the annular band optical filter and outputting an interference field; the imaging mirror is used for projecting the interference field to the detector; and the detector is used for converting the projected optical signal into a digital electric signal. The F-P spectral imaging system which can maintain high spectral resolution and also can realize wide spectrum coverage is constructed by introducing the annular band optical filter which is accurately matched with the FSR of the F-P interferometer.

The invention provides a tool positioning system and a tool positioning method, the system comprises a camera tool, a calibration tool and a light machine module of a vertical measurement sensor, and the camera tool is detachably connected with the calibration tool and the light machine module of the vertical measurement sensor; the camera tool comprises a mounting plate, a plurality of imaging lens groups arranged on the mounting plate, and a plurality of cameras connected with the imaging lens groups in a one-to-one correspondence manner, and the imaging lens groups and the corresponding cameras cooperate to realize imaging of target marks; the calibration tool comprises a base and a plurality of calibration circular holes formed in the base, and the plurality of calibration circular holes correspond to the plurality of cameras one by one; a rectangular mark is arranged on an optical machine module of the vertical measurement sensor, and the rectangular mark is moved into a rectangular frame drawn according to the calibration round hole by adjusting the optical machine module so as to meet the optical machine assembly precision requirement of the vertical measurement sensor. According to the invention, personal errors can be reduced, and the precision of vertical measurement sensor optical-mechanical assembly is effectively improved.

To provide a reflector and a reference point surveying method having a simple structure and capable of detecting the incident direction of a light beam to the reflector without changing a measuring reference point regardless of the incident direction of the light beam.SOLUTION: The direction detector includes an image-forming lens (4) and a light-receiving sensor (5), and is configured such that principal rays 11a, 11b, 11c, and 11d that are incident so as to pass through the center of the ball lens and are transmitted through the ball lens are reflected by an outer face of the spherical crown and an inner face of the spherical crown or a face of the ball lens and are then incident on the direction detector. The direction detector is configured to detect the incident direction of the main light beam with respect to the main optical axis based on a light receiving position 5d of the light receiving sensor when the main light beam is incident on the imaging lens and is imaged on the light receiving sensor by the imaging lens.SELECTED DRAWING: Figure 1

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

The invention provides an imaging lens which is small in size and maintains good optical performance and an imaging device provided with the imaging lens. The imaging lens includes, in order from an object side to an image side, a first lens group, an aperture, and a second lens group. The second lens group includes two or more lenses satisfying the following conditional expression, where f is the focal length of the imaging lens in a state in which the imaging lens is focused on an infinite object, and Rf is the radius of curvature of the object-side surface of the lens included in the imaging lens. -15 < f / Rf <-0.5