785 results about "Field angle" patented technology

The invention discloses an optical lens which is sequentially arranged from an object side to an image side along an optical axis of the lens: a first lens which is a glass lens with negative focal power; the second lens has negative focal power; the third lens is provided with positive focal power; a fourth lens, wherein the fourth lens has positive focal power or negative focal power; an aperture stop; a fifth lens, wherein the fifth lens has a positive focal power or a negative focal power; a sixth lens having a positive focal power or a negative focal power; a seventh lens having a positive focal power or a negative focal power; and the eighth lens is a plastic lens with positive focal power or negative focal power. The lens is formed by mixing glass and plastic, the field angle is larger than or equal to 200 degrees, the aperture is larger than or equal to 1.9, and the lens has the advantages of being large in field of view, large in aperture, high in imaging quality and high in brightness.

The invention provides an optical lens, which comprises eight lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative focal power, the object side surface of the third lens near the optical axis is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power, and the image side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface; and the eighth lens has positive focal power. The optical lens provided by the invention has one or more advantages of short focus, large field angle, high imaging quality and the like.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has negative focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention provides an optical lens, which comprises eight lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative focal power, the object side surface of the third lens near the optical axis is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has positive focal power; the seventh lens has negative focal power; and the eighth lens has positive focal power. The optical lens provided by the invention has one or more advantages of short focus, large field angle, high imaging quality and the like.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power; the seventh lens has positive focal power; the eighth lens has positive focal power; and the ninth lens has positive focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The invention provides an optical lens, which comprises nine lenses from an object side to an imaging surface along an optical axis: a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the sixth lens has negative focal power, and the image side surface of the sixth lens is a concave surface; the seventh lens has positive focal power; the eighth lens has positive focal power; and the ninth lens has negative focal power. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of short focus, miniaturization, large field angle, large aperture, large target surface, low distortion and low sensitivity.

The utility model discloses a lens for delaying eye axis growth by using a negative defocus technology, particularly relates to the field of optical spectacle lenses, and aims to solve the problems that myopia of children and adolescents in China is severe, low-age and severe, existing common methods include angle molding, defocus and foggy vision (point diffusion), and the prevention and control efficiency is declined due to the large use of the methods. According to the utility model, myopia can be better prevented and controlled, and the prevention and control efficiency is improved. A composite ring belt design is adopted, the defocusing amount of an aspheric micro lens in a composite ring belt structure is negative defocusing, and the range of the defocusing amount of the aspheric micro lens is-5.0 D-(-6.5 D). While clear vision correction is ensured in an optical central area, the defocusing amount of a ring belt outside the central area is in an asymptotically increasing trend, so that continuous defocusing is formed in a peripheral area, and the visual acuity is improved. And personalized compensation is carried out on the defocusing amount of the field angle to form a continuous myopia defocusing state, so that excessive increase of the ocular axis and the diopter is delayed, and the purpose of controlling myopia is achieved.

The invention provides an optical lens, which comprises four lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; wherein the maximum field angle FOV of the optical lens and the real image height IH corresponding to the maximum field angle of the optical lens meet the following conditions: 35 degrees / mmlt; fOV / IHlt; 46 degrees / mm; the focal length f3 of the third lens and the focal length f4 of the fourth lens satisfy 0.5 lt; f3 / f4lt; and 0.8. According to the optical lens provided by the invention, through specific surface shape matching and reasonable focal power distribution, the lens has one or more advantages of an ultra-wide angle, a large aperture, high imaging quality, high collimation and the like.

The invention discloses a design method for a metasurface non-staggered polarization multiplexing holographic display device, and the method comprises the steps: carrying out the phase analysis of an initial polarization detection signal according to a phase recovery algorithm, and obtaining phase analysis information; receiving an incident polarized light signal and an emergent polarized light signal to construct emergent light complex amplitude, and combining phase analysis information to obtain analysis parameters corresponding to all positions in the metasurface device; constructing corresponding structure-phase delay mapping according to scanning information obtained by scanning, and further performing matching mapping on the analysis parameters to obtain corresponding mapping information; according to the mapping information, microstructure geometric parameters of all positions in the metasurface device are restored, and metasurface device design information is obtained. According to the design method, the holographic display device capable of carrying out independent phase regulation and control on any three polarization states can be designed, and the limitation that a non-staggered metasurface can only aim at orthogonal polarization state regulation and control is broken through; moreover, high-spatial-resolution display imaging can be realized, and the imaging field angle is larger.

The utility model relates to the technical field of detection equipment, and provides multi-spectral detection equipment for defects in industrial places, which comprises a three-axis cradle head bracket, the detector outer shell is rotationally connected with the three-axis holder bracket, and the position adjustment of the detector outer shell is controlled by the three-axis holder bracket; the visible light lens I, the visible light lens II, the infrared lens and the ultraviolet lens are mounted on the detector outer shell, and lenses of the four lenses are positioned on the same side surface of the detector outer shell; and the visible light lens I, the visible light lens II, the infrared lens and the ultraviolet lens are distributed in a crossed manner. According to the technical scheme, visible light pictures and infrared or ultraviolet pictures under the same field angle can be collected, the four lenses are distributed in a crossed mode, coordinate transformation of the pictures can be achieved conveniently, information result fusion of visible light detection and infrared or ultraviolet detection is achieved, and the detection accuracy is improved. And the detection accuracy and reliability of industrial place defects and the like can be improved.

The invention provides an optical lens, which comprises eight lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an image side along an optical axis, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface; the fifth lens has negative focal power, the object side surface of the fifth lens is a convex surface near the optical axis, and the image side surface of the fifth lens is a concave surface; the sixth lens has positive focal power, and the image side surface of the sixth lens is a convex surface; the object side surface of the seventh lens is a convex surface near the optical axis, and the image side surface of the seventh lens is a convex surface; and the object side surface of the eighth lens is a convex surface near the optical axis, and the image side surface of the eighth lens is a concave surface near the optical axis. The optical lens provided by the invention has one or more advantages of large field angle, small distortion, low sensitivity, high imaging quality and the like.

The invention provides a projection lens, which comprises five lenses in total, and sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from a projection surface to an image source surface along an optical axis, the surface of the projection side of the second lens is a convex surface, and the surface of the image source side of the second lens is a convex surface; the surface of the projection side of the third lens is a concave surface, and the surface of the image source side of the third lens is a concave surface; the surface of the projection side of the fourth lens is a convex surface, and the surface of the image source side of the fourth lens is a convex surface; the surface of the projection side of the fifth lens is a convex surface, and the surface of the image source side of the fifth lens is a convex surface; wherein the real image height IH corresponding to the maximum field angle of the projection lens and the effective focal length f of the projection lens meet the following conditions: 0.6 lt; iH / flt; and 0.8. According to the projection lens provided by the invention, the projection quality of the projection lens is improved through the reasonable configuration of the surface types of the lenses and the reasonable matching of the focal power.

The invention discloses a semiconductor defect detection method and device, and the detection method comprises the steps: controlling the bright field illumination and the objective magnification, and obtaining the surface microstructure morphology of a to-be-detected sample; determining the process type of the sample to be detected based on the surface microstructure morphology, and automatically determining dark field illumination light intensity parameters of at least two groups of dark field light sources according to a preset mapping relation between the process type and the dark field illumination light intensity parameters; according to the tissue morphology of the sample, at least two dark field light sources with different incident angles are controlled to carry out dark field illumination on the sample to be detected from different directions, and scattered signal images corresponding to different dark field angles are obtained through at least two detectors respectively; and analyzing defect information of the to-be-detected sample based on the scattered signal images at the dark field angles. The detection method can be adaptive to defect detection of different process sheet types, can effectively improve the detection precision of defect diversity and directivity, improves the detection signal-to-noise ratio, and efficiently detects multiple different types of defects at the same time.

A radar system and a radar ranging method. The radar system comprises: a light emission assembly (100), which successively emits a plurality of groups of emitted light; a receiving end assembly (200), which receives reflected light after the emission light is reflected by a target object and converts the reflected light into a received electrical signal; a light scanning member (300); and a processor (600), which determines the distance to the target object according to the received electrical signal, and adjusts control parameters related to the received electrical signal and a detection field-of-view angle, such that the control parameters change according to a first preset rule starting from an emission start moment; or the detection field-of-view angle changes according to a second preset rule starting from the emission start moment.

The invention provides an optical lens, which comprises eight lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has negative focal power, the object side surface of the third lens near the optical axis is a convex surface, and the image side surface of the third lens is a concave surface; the fourth lens has positive focal power, and the object side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens is a convex surface, and the image side surface of the seventh lens is a concave surface; and the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a convex surface. The optical lens provided by the invention has one or more advantages of short focus, large field angle, high imaging quality and the like.

The embodiment of the invention provides a large-viewing-angle composite optical film. The large-viewing-angle composite optical film comprises a base material film layer; the first prism film layer is arranged on one side of the base material film layer; the second prism film layer is arranged on the other side of the base material film layer; a plurality of first prism units extending in the first direction are arranged on the side, close to the base material film layer, of the first prism film layer, and a platform interval is formed between every two adjacent first prism units; a plurality of second prism units extending along a second direction are arranged on one side, adjacent to the base material film layer, of the second prism film layer; wherein the first direction intersects with the second direction, and the first prism units and the second prism units are oppositely arranged in the direction perpendicular to the base material film layer. The utilization rate of light energy is improved, and the loss of central brightness is effectively inhibited while the visual angle is obviously expanded. After the first prism film layer and the second prism film layer are compounded, on the basis of maintaining high brightness gain, the field angle is obviously widened, and collaborative optimization of brightness attenuation gentle and overall optical uniformity under a large angle of view is realized.

The wide-angle lens comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object plane to an image plane along an optical axis, the first lens is a glass spherical lens with negative focal power, the object side face of the first lens is a convex face, and the image side face of the first lens is a concave face. The second lens is a plastic aspheric lens with negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface. The third lens is a plastic aspheric lens with positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface. The fourth lens is a plastic aspheric lens with positive focal power, the object side surface of the fourth lens is a convex surface or a concave surface, and the image side surface of the fourth lens is a convex surface. The glass spherical surface and the plastic aspheric surface are matched and combined, the resolution is improved, the total axis length is smaller than 10.5 mm, the aperture F can reach 1.6, the field angle FOV can reach 183 degrees, the relative illumination can reach 50%, and the lens has the advantages of being large in aperture, ultra-large in field angle, small in size and high in illumination.

The present disclosure is directed to imaging LiDARs with separate transmit (Tx) and receive (Rx) optical antennas fed by different optical waveguides. This pair of optical antennas can be activated at the same time through a dual-channel optical switch network, with the Tx antenna connected to a laser source and the Rx antenna connected to a receiver. The Tx and Rx antennas can be positioned adjacent to each other, so they point to approximately the same far-field angle. No optical alignment between the Tx and Rx is necessary. This LiDAR configuration, referred to herein as pseudo-monostatic LiDAR, eliminates spurious reflections and increases the dynamic range of the LiDAR.

The invention provides a waveguide display device and a display method of the waveguide display device. The waveguide display device comprises a time division multiplexing optical machine, the time division multiplexing optical machine is used for alternately outputting light rays of multiple view fields at different moments, and the light rays of the view fields are different in wavelength and / or polarization state; a waveguide; the coupling-in device is arranged on the waveguide, and the coupling-in device is used for coupling the light rays emitted by the time division multiplexing optical machine into the waveguide and enabling the light rays to be subjected to total reflection propagation in the waveguide; the coupling-out device is arranged on the waveguide, the coupling-out device comprises a plurality of superposed coupling-out parts, each coupling-out part is used for coupling out light of one view field in the waveguide, and different view fields are spliced into a complete image. The waveguide display device solves the problem that a waveguide display device in the prior art is difficult to give consideration to large-field-angle display and cost reduction at the same time.

The invention relates to the technical field of data processing, in particular to a FOV (field of view) calculation method and system for a continuous zoom camera, and the method comprises the steps: determining the visual width and the visual height according to the gray value changes of pixel points in the transverse direction and the longitudinal direction in a binary image of each frame of target image, screening out a plurality of segmented frame target images, and carrying out the calculation of the FOV of the continuous zoom camera; and for all segmented frame target images, performing function fitting by taking the error requirement degree as a weight of a weighted residual sum of squares in a function fitting process, taking a focal length as an independent variable and respectively taking the vertical field angle and the horizontal field angle as dependent variables, so as to obtain a target image. And acquiring a first fitting function and a second fitting function, respectively inputting the current focal length into the first fitting function and the second fitting function, and outputting the current vertical field angle and the horizontal field angle. According to the invention, by obtaining a more accurate relation function between the focal length and the field angle, the calculation accuracy of the field angle is ensured.

The embodiment of the invention discloses intelligent glasses, a shielding detection device and electronic equipment, and is characterized in that a sensor assembly is arranged in a mounting cavity of a shell and is aligned with a light hole of the shell, and the sensor assembly comprises an ambient light sensor, a proximity sensor and an infrared light source; at least two visible light sources are arranged in different radial directions of an ambient light sensor, a control circuit controls a visible light source group to emit indication light, controls an infrared light source to emit infrared light, and determines the shielding state of a window according to at least one of a first detection signal of the ambient light sensor and a second detection signal of a proximity sensor. The indication light emergent area and the shielding detection light incident area share the same light hole, the condition that shielding detection fails when only the indication light emergent area is shielded is avoided, and the field angle of the ambient light sensor is relatively symmetrical in all directions through the position arrangement of the visible light source, so that the shielding detection accuracy is improved. And the shielding detection sensitivity and accuracy can be improved.

The invention provides an optical lens, which comprises seven lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has negative focal power; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the seventh lens has negative focal power; the optical total length TTL of the optical lens, the real image height IH corresponding to the maximum field angle of the optical lens and the maximum field angle FOV of the optical lens meet the following conditions: 0.17 lt; 1 degree * TTL / (IH / 2) / (FOV / 2) lt; and 0.24. According to the optical lens provided by the invention, the imaging quality of the optical lens can be improved, the aberration is reduced, and the imaging quality of the optical lens is improved.

The invention relates to the technical field of ultraviolet imaging testing, and particularly discloses an ultraviolet imaging testing device and an ultraviolet imaging testing correction method.The ultraviolet imaging testing device comprises a window material, a spectroscope, a visible light camera and an ultraviolet camera, visible light and ultraviolet light in the field angle range are received through the window material and then transmitted to the spectroscope; the spectroscope reflects short-wave ultraviolet light to the optical axis direction of the ultraviolet camera based on the reflection and transmission characteristics of the spectroscope, the ultraviolet camera specially receives the short-wave ultraviolet light so as to detect corona discharge and other weak signals, meanwhile, visible light penetrates through the spectroscope and is received by the visible light camera, and the component is used for capturing background visible light information to facilitate follow-up image fusion processing. The system integrates ultraviolet and visible light data to comprehensively evaluate the insulation state of equipment, is suitable for long-distance or weak discharge detection, and enhances the inspection efficiency and reliability of electric power facilities.

An optical system of binoculars includes a first object biconvex lens of positive focal power, a second object meniscus lens of negative focal power, a third object meniscus lens of positive focal power, a fourth object meniscus lens of negative focal power, a half pentaprism, a roof prism, a first eyepiece biconcave lens of negative focal power, a second eyepiece biconvex lens of positive focal power, a third eyepiece biconvex lens of positive focal power, a fourth eyepiece meniscus lens of negative focal power, and a fifth eyepiece meniscus lens of positive focal power. These are sequentially arranged along an optical axis direction from an object side to an observation side. When focusing, the fourth object lens moves along the optical axis direction. The binoculars include an exit pupil diameter range of 3.5 mm-4.5 mm, an exit pupil distance range of 15-18 mm, and a field angle range of 6°-6.5°.

The invention provides an optical lens, which comprises six lenses with focal power and sequentially comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with negative focal power, a fifth lens with negative focal power and a sixth lens with negative focal power from an object side to an imaging surface along an optical axis, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface. According to the optical lens provided by the invention, the imaging quality of the optical lens is improved, the aberration is reduced, the imaging quality of the optical lens is improved, and the lens has one or more advantages of large aperture, short focus, ultra-large field angle, high imaging quality and the like.

The invention provides an unmanned aerial vehicle path planning method and system based on adaptive dynamic planning. The method comprises the following steps: calculating a solar azimuth angle according to an atmospheric polarization mode, compensating course drift of a visual odometer by using the solar azimuth angle, and generating corrected unmanned aerial vehicle position information; according to the illumination invariant edge information, combining a convolutional neural network, segmenting a key landmark in the texture enhanced image, and generating a semantic navigation landmark point sequence in a constraint space of the key landmark by adopting a bidirectional fast random tree; constructing a model prediction controller according to the semantic navigation road sign point sequence; and through the corrected position information, the flight path of the unmanned aerial vehicle is optimized in a rolling manner through adaptive dynamic planning under the constraint of a dynamic window, and the field angle and exposure parameters of the dual-band imaging unit are adjusted. According to the invention, the autonomous navigation precision and semantic understanding capability of the unmanned aerial vehicle in a complex light environment are improved, and anti-interference and high-precision autonomous path planning and flight control are realized.

The invention provides a laser-corrected dual-band infrared passive distance measurement method, which comprises the following steps of: firstly, acquiring information of a target at three continuous sampling moments by using an infrared detection system, and estimating an extinction coefficient and path radiation; then calculating a multi-mode fusion distance at a next sampling moment; correcting a medium-wave extinction coefficient, medium-wave path radiation, a long-wave extinction coefficient and long-wave path radiation by using the field angles, the irradiance and the laser ranging values at the second to fourth sampling moments; and for a subsequent moment, calculating the multimode fusion distance of the target as a resolving value of the target distance at the sampling moment, and then correcting the medium wave extinction coefficient, the medium wave path radiation, the long wave extinction coefficient and the long wave path radiation. According to the method, dual-band infrared passive distance measurement and laser distance measurement are fused, target motion information is combined, accumulative errors of infrared passive distance measurement and a motion model are eliminated through laser correction, the defect of infrared distance measurement is compensated, the distance measurement precision and the distance measurement stability are improved on the premise of concealment, and multi-target real-time distance measurement is achieved.

The invention provides a deep space background-oriented space target sequence image generation method and device, electronic equipment and a medium, and relates to the field of space target optical image simulation. The method comprises the steps of obtaining pose data of a space target in an observation time period through simulation based on pre-defined initial parameters; screening imageable fixed stars from the reference star library according to the field angle and the detectability of the on-orbit optical camera; based on the position data of the imageable fixed star, generating a deep space background image matched with the observation view field of the space target through brightness simulation and coordinate system transformation; generating a time sequence rendering image through a rendering engine by using the three-dimensional model and the pose data of the space target; and superposing the deep space background image and the time sequence rendering image according to foreground and background distribution, and adding noise to obtain a simulation sequence image.

The application discloses a telephoto lens and electronic equipment, which is composed of first to sixth lenses from the object side to the image side; wherein the first, second and fifth lenses have positive refractive power, and the fourth and sixth lenses have negative refractive power; in addition, the object side and the image side of the first lens are convex and concave respectively, the object side and the image side of the second lens are both convex, the object side and the image side of the third and fourth lenses are both concave, and the object side and the image side of the fifth and sixth lenses are concave and convex respectively. In the telephoto lens, the focal length f of the telephoto lens, the focal length f1 of the first lens, the total focal length f13 of the optical system formed by the first to third lenses, and the maximum field angle FOV of the telephoto lens satisfy the following conditions: 0.3 < f1 / f < 1.2; 0.9 < f1 / f13 < 1.5; FOV < 40. The application reasonably restricts the focal length and the field angle of the lens, so that the lens is light, thin, small, can correct aberration well, has high pixels, high resolution and excellent imaging quality, and can meet the application requirements.

The present application relates to the technical field of lens assembly, especially to an inner parameter calibration system suitable for lens modules with different field angles, which comprises a fixing assembly, a picture card assembly, a relay assembly and a platform assembly. The fixing assembly comprises a fixing device, and the lens module is fixed on the fixing device and can move along the Y-axis direction and rotate around three axes in space. The picture card assembly comprises a first mounting mechanism and a second mounting mechanism which can move up and down and fix the picture card, and the pattern of the picture card is arranged opposite to the lens module. The relay assembly is arranged between the second mounting mechanism and the fixing assembly. The platform assembly comprises a first platform and a second platform arranged in a vertical manner. The inner parameter calibration system has the advantages of effectively adjusting the distance between the picture card and the lens module, enhancing the adaptability of the lens modules with different field angles, reducing the occupied space and improving the calibration efficiency.