273 results about "Prime lens" patented technology

The invention belongs to the technical field of lenses, particularly to a high-definition super wide angle prime lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the object space to the image space, wherein the fourth lens and the fifth lens adopt plastic aspherical lenses; the first lens, the second lens, the third lens and the sixth lens are glass spherical lenses; the first lens is a convex-concave negative focal power lens; the second lens is a bi-concave negative focal power lens; the third lens is a bi-convex positive focal power lens; the fourth lens is a bi-convex positive focal power lens; the fifth lens is a bi-concave negative focal power lens; the sixth lens is a bi-convex positive focal power lens. According to the high-definition super wide angle prime lens, glass lenses and plastic lenses are reasonably combined, so that a large aperture is realized, the imaging quality is good, 4 megapixel can be realized under the precondition that infrared does not focus again, and clear and bright monitoring pictures can be realized even at night with a low illumination level; the lens has a temperature compensation function, and can be used at the temperature of minus 30 DEG C-80 DEG C without being out of focus.

The invention discloses an athermalization high-resolution prime lens which, from the object side to the image side, sequentially comprises: a pre-group lens with negative focal power, a diaphragm, apost-group lens with positive focal power, and an imaging plane, wherein the pre-group lens sequentially comprises a first battery of lenses, a second lens with negative focal power, and a third lenswith positive focal power; the post-group lens sequentially comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, and a seventh lens with positive focal power. According to the athermalization high-resolution prime lens disclosed by the invention, a small high-image-quality athermalization prime lens is designed by reasonably combining spherical surface and non-spherical surface, and has the advantages of simple structure and low cost, and overcomes the defect of low image quality of existing simple-structure lens, and perfectly controls distortion and chromatic aberration in the whole field of view.

A fixed focal length lens has a focal length of a whole system shorter than a back focus. The fixed focal length lens includes an aperture stop, and an image-stabilizing lens unit that moves in a direction including a component of a direction orthogonal to an optical axis to reduce an image blur. The conditions of 0.1<f / |fis|<0.5 and −0.35<Dis / DL<0.25 are met, where f is the focal length of the whole system, fis is a focal length of the image-stabilizing lens unit, Dis is a distance from the aperture stop to a surface farthest from the aperture stop of the image-stabilizing lens unit, and DL is a distance from a first surface closest to an object side to a final surface closest to an image side of the fixed focal length lens. A sign of the distance is positive in a direction from the object side to the image side.

The invention discloses a fixed-focus lens which comprises an aperture stop, a first positive lens, a second negative lens, a third meniscus positive lens and a fourth negative lens; wherein, the aperture stop, the first positive lens, the second negative lens, the third meniscus positive lens and the fourth negative lens are arranged on an optical axis from an objective end to an imaging end in sequence. The fixed-focus lens satisfies the requirements as follows: RS32 / f is more than 0.1 and less than 0.3, wherein, the f is the effective focal length of the fixed-point lens, and the RS32 is the curvature radius of the surface of the third meniscus positive lens near the imaging end. The fixed-focus lens of the invention limits the effective focal length to avoid the overlength of the total length of the system through setting the proper effective focal length, and thereby the favorable picture quality and the adequate imaging height are provided.

A fixed-focus lens system includes, in order from an object side to an image side along an optical axis thereof, an aperture stop, a first positive lens, a second negative lens, a third positive meniscus lens, and a fourth negative lens having increasing negative refractive power from the optical axis toward the periphery. The fixed-focus lens system satisfies the following condition: 0.1<RS32 / f<0.3, where f is the effective focal length of the fixed-focus lens system, and RS32 is the curvature radius of an image-side surface of the third positive meniscus lens.

A fixed-focus lens including a first lens group, a second lens group and an aperture stop is provided. The first lens group has a positive refractive power, and includes a first lens, a second lens and a third lens arranged in sequence from a magnified side to a reduced side. The second lens group has a positive refractive power, and includes a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the magnified side to the reduced side. A product of a refractive power and a slope of a refractive index changing with a temperature change of any one lens of the second lens group is P×(dn / dt), and a sum of P×(dn / dt) of the lenses of the second lens group is less than 0. The aperture stop is disposed between the first lens group and the second lens group.

The invention discloses a method for calculating an image definition value for focusing, a computing device and a focusing system. The method performed in the computing device comprises: a grayscale image of a test card arranged at a predetermined distance of a prime lens is obtained, wherein the test card includes am image combination unit including a white cross portion, a black circle portion centering on the white cross portion and a gray circular disk portion centering on the white cross portion; the center point of the white cross portion is located and a pixel area including the image combination unit is obtained based on the center point; edge extraction is carried out on the pixel area to obtain a cross edge and a circular ring edge; comparison values between all pixels and surrounding pixels at the cross edge are calculated and an average comparison value is calculated; an average grayscale of the internal area of the circular ring edge is calculated; and on the basis of theaverage grayscale and the average comparison value, an image definition value of the grayscale image is calculated. Therefore, the accuracy of the focusing of the prime lens is improved and local focusing is carried out on the image.

A fixed-focus lens disposed between a magnified side and a minified side. The fixed-focus lens has an optical axis and includes a reflective system and a refractive system. The reflective system includes a reflection mirror with a negative refractive power. The refractive system is disposed between the reflection mirror and the minified side and includes a first lens group and a second lens group. The first lens group has a positive refractive power. The second lens group is disposed between the first lens group and the minified side, and has a positive refractive power. The fixed-focus lens satisfies F / H>0.23, where F is an effective focal length and H is an image height.

The invention relates to a fixed focal lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the amplification side to the zoom out side, wherein the diopters of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially negative, negative, positive, negative, positive and positive; and the fixed focal lens is in accordance with the condition that the absolute value of f3 / TT is more than 0.2 and less than 0.6, wherein the f3 is the effective focal length of the third lens, and the TT is the total length of the fixed focal lens.

The invention relates to the technical field of navigation and positioning, in particular to a real-time synchronous acquisition device for image type sky polarized light distribution modes. The acquisition device comprises three cameras with linear polaroids, and a computer processing system, wherein the cameras are provided with independent kilomega network ports, and connected in the computer processing system by exchangers; the exchangers perform IP (Internet Protocol) address setting and serial number distribution; the cameras are arranged on mechanical supporting frames; central axes of lenses of the cameras are parallel; projections of the three central axes in a vertical plane form an equilateral triangle; the side length d of the equilateral triangle is obtained by the following calculation formula as shown in the specification; the three cameras are connected with the three prime lens respectively; the prime lens are equipped with the linear polaroids; and polarization polarity angles of the linear polaroids satisfy the following formula: alpha 1 is greater than or equal to 0 degree and less than alpha 2, and alpha 3 is greater than alpha 2 and less than 180 degrees. The acquisition device can acquire an overlapped part of public areas shot by the three cameras, the area displays polarization degree and polarization angle information, real-time synchronous acquisition of the polarization information is realized. The acquisition device is simple in structure, convenient to process, good in real-time synchronization, and higher in practicability.

The invention provides a camera automatic variable-time control method based on the human eye space. According to the method, a zoom lens and / or zoom driving motor or a prime lens, an image sensor and a video analysis processing unit are mainly used, the front side of a person enters a shooting view field, the two eyes in the video are locked, the space w of the two eyes is measured and calculated, at the moment, the lens focus f and the human eye general space W and the human eye space w in the video are known quantities, the values are substituted into a formula, the distance of an object to be shot can be calculated, the expected human face size is set in a monitoring image, the space between the two eyes in the image is wi, the space w of the two eyes in an actual image is measured and calculated, the ratio of the w to the wi is calculated, the zoom power of the lens is regulated according to a preset relational expression in accordance to the proportion relationship, so that the regulated w equals to the wi, the steps are repeated when the distance between the human face and the lens is changed, and the w is enabled to be equal to the wi, so that the human face can be enabled to be always displayed in the image in the preset size in a certain distance range.

A fixed-focus lens including a first lens group, a second lens group, and a third lens group is provided. The first lens group has a negative refractive power, includes a plurality of lenses, and is disposed between an object side and an image side. The lenses of the first lens group include at least one aspheric lens. The second lens group is disposed between the first lens group and the image side and has a positive refractive power. The third lens group is disposed between the second lens group and the image side and has a positive refractive power. The third lens group includes a first triple cemented lens and a second triple cemented lens arranged from the object side to the image side in sequence.

The embodiments of the invention disclose a lens system and a prime lens. The lens system comprises a first lens group with positive focal power, an aperture diaphragm, and a second lens group with positive focal power, which are arranged in sequence along the optical axis from the object side to the image side. The first lens group comprises a first lens with negative focal power, a second lens with negative focal power, a first sub-lens group with positive focal power and a second sub-lens group with positive focal power, which are arranged in sequence along the optical axis from the object side to the image side. The second lens group comprises a third sub-lens group with negative focal power and a fourth sub-lens group with positive focal power, which are arranged in sequence along the optical axis from the object side to the image side. In the scheme, under cooperation of the lenses and the lens groups in structure, focal power, focal length and arrangement order, super-high light flux and high resolution above 5 mega pixels can be achieved. Moreover, in a low-light environment, all-weather color video monitoring can be realized without infrared light supplement.

A fixed-focus lens adapted to be disposed between a magnified side and a reduced side is provided. The fixed-focus lens includes a first lens group, a second lens group, and a third lens group. The first lens group disposed between the magnified side and the reduced side includes three lenses and has a negative refractive power. The second lens group disposed between the first lens group and the reduced side includes five lenses and has a positive refractive power. The third lens group disposed between the second lens group and the reduced side includes five lenses and has a positive refractive power. The fixed-focus lens satisfies |F1 / F|<1.35, 3.5<|F2 / F|<4.5, and 4<|F3 / F|<5, wherein F1 is the effective focal length (EFL) of the first lens group, F2 is the EFL of the second lens group, F3 is the EFL of the third lens group, and F is the EFL of the fixed-focus lens.

The invention relates to the technical field of machine vision, in particular to a machine vision based LED detection device and a detection method thereof. The LED detection device comprises a carrier plate clamp, a camera obscura and an industrial personal computer, an industrial camera connected with the industrial personal computer is arranged in the camera obscura, a prime lens is arranged on the industrial camera, a condensation plate disposed at the front end of the prime lens is further arranged in the camera obscura, at least two positioning lamps are arranged on a plane of the condensation plate, through holes are formed in a coordinate system plane formed by the positioning plates, and the carrier plate clamp is connected with the through holes through a conduction fiber. The machine vision based LED detection device can detect LEDs quickly, efficiently and stably with low cost, and is applicable to any application environment needing to detect a large quantity of printed circuit board LEDs; the detection method can quickly and efficiently complete detection of dozens of LEDs, and is simple, convenient and rapid to operate.

A fixed focus lens comprising, sequentially from an object side, a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group having a positive refractive power. The first lens group includes an aperture stop. The second lens group is configured by a single lens element. During focusing, the second lens group moves along an optical axis and the first lens group and the third lens group are fixed with respect to an imaging plane.

The invention relates to an economical high resolution day and night fixed focus lens. A front group with a negative focal power and a back group with a positive focal power are orderly arranged along a light incident direction. The front group is orderly provided with a positive crescent lens A-1 and a negative crescent lens A-2. The focal length fA of the front group is -21.996mm. The back group B is orderly provided with a gluing group with the closed connection of a biconcave lens B-1 and a biconvex lens B-2 and a biconvex lens B-3, and the focal length fB of the back group is 6.792mm. According to the lens, the total number of lends is reduced in the condition of ensuing performance, besides the high resolution, large relative aperture, day and night confocal performance, low distortion and short shooting distance of an 8mm fixed focal lens, the economical high resolution day and night fixed focus lens is more economical and is generally used in a dark or no-light place with the requirement of high definition picture quality such as a road, a warehouse, an underground parking place, a bar, a pipe, a corridor and a park, and the economical high resolution day and night fixed focus lens is a mainstream product of a micro monitoring camera system.

The invention discloses a robot gripping system based on visual guidance. The robot gripping system comprises a CCD camera, a lens, a light source, an industrial control computer and an industrial control robot; the CCD camera is an industrial camera, and communicates with a computer through a gigabit Ethernet; and the CCD camera is installed above a conveyor belt. The lens is a prime lens. The light source is an LED ring light source. Image information collected by the CCD camera is received, and converted into robot control signals for controlling the actual position of a robot end-effectorupon completion of workpiece recognition with an image processing algorithm. The industrial control robot is provided with six rotating joints, driven by an AC servo motor, and used for gripping operation on a production line. The robot gripping system is higher in locating accuracy, and meets industrial production requirements; and the robot gripping system is of great significance in improvementof automation level of the production line.

The invention discloses a small ultra-wide low-distortion prime lens. The prime lens sequentially comprises, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens and the fourth lens are glass spherical lenses. The second lens, the third lens, the fifth lens and the sixth lens are plastic aspheric lenses. The first lens is a plane-concave glass lens with negative focal power. The second lens is a convex-concave plastic lens with negative focal power. The third lens is a concave-convex plastic lens with positive focal power. The fourth lens is a biconvex glass lens with positive focal power. The fifth lens is a biconcave plastic lens with negative focal power. The sixth lens is a biconvex plastic lens with positive focal power. According to the invention, by combining and optimizing the glass lenses and the plastic lenses reasonably, the maximum image plane of the prime lens can be over 1 / 2.7'', the field angle is larger than 130 degrees, the maximum aperture F is 1.8, TV distortion is less than 8%, and image distortion is reduced greatly. Moreover, the prime lens has a day-night confocal function and a temperature compensation function.

A fixed-focus lens disposed between an enlarged side and a reduced side is provided. An f-number of the fixed-focus lens is smaller than or equal to 2. The fixed-focus lens includes a first lens group and a second lens group. The first lens group includes a first lens, wherein the first lens is an aspheric lens. The second lens group, disposed between the first lens group and the reduced side, has a positive dioptre. The second lens group includes a second lens, wherein the second lens is an aspheric lens. The fixed-focus lens focuses by moving the first and the second lens group and satisfies 0.1<|f / f1|<1, 0.2<|f / f2|<1.5, and 1.5<L / BEL<3.5, where f, L, and BFL are respectively a focal length, a total length, and a back focal length of the fixed-focus lens, and f1 and f2 are respectively an effective focal length of the first and the second lens group.

A fixed-focus lens including a first lens group and a second lens group is provided. The first lens group is disposed between a magnified side and a reduced side and includes a first lens and a second lens arranged in sequence from the magnified side to the reduced side. The refractive powers of both the first lens and the second lens are negative, and the first lens is an aspheric lens. The second lens group is disposed between the first lens group and the reduced side and includes a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens arranged in sequence from the magnified side to the reduced side. The refractive powers of the seven lenses from the third lens to the ninth lens are respectively positive, negative, positive, negative, positive, negative, and positive in sequence.

The invention discloses a standing-tree diameter measuring device based on laser ranging and image technologies. The standing-tree diameter measuring device has the structure that a laser range finder is connected with a mobile phone based on an Android system through a data wire; a prime lens is arranged on the mobile phone based on the Android system; the laser range finder is used for transmitting the measured distance value u between the mobile phone and a standing tree to the mobile phone while the mobile phone based on the Android system takes a photo; and the actual diameter of the standing tree can be calculated according to a calibration function, the measured distance and the number of pixels of the standing-tree diameter on an image. By adopting the standing-tree diameter measuring device based on the laser ranging and image technologies, the diameter value of a trunk of the standing tree can be quickly detected.

The invention discloses a night and day dual-purpose monitoring prime lens, adopting five lenses and reducing quantity of lens, wherein three lenses are aspheric surface lenses which are made of plastics materials, which effectively reduces the weight of the lens and the manufacture cost and improves the product competiveness. The night and day dual-purpose monitoring prime lens enables the lens image difference to be effectively corrected through optimizing and configuring the positive and negative focal length of various lenses and overcomes the defects of the plastic aspheric surface lenses that the focal point drift easily happens under the high or low temperature environment due to the big expansivity. Through the usage of the configuration, the lens focal point drift shift of the product is controlled in the reasonable range, and the night and day dual-purpose monitoring prime lens has an advantage of good analysis under the low or the high temperature, increases the lens usage occasions and the environment condition range, and improves the lens product quality and the competiveness.

The invention belongs to the technical field of visual detection and relates to a circular ring side wall defect visual detection system. A first photographing device and a first strip-shaped light source are arranged above a side portion of a workpiece; an included angle between the light-emitting surface of the first strip-shaped light source and a horizontal plane ranges from 45 degrees to 70 degrees; a contour matching algorithm is executed on the basis of a collected workpiece image so as to perform recognition to obtain a workpiece contour image; a spot analysis algorithm is utilized toperform operation recognition on the workpiece contour image so as to obtain the area numerical value of an abnormal region; and a condition judgment algorithm is utilized to judge the area numericalvalue of the abnormal region, and a judgment result is outputted. According to the circular ring side wall defect visual detection system of the invention, the relevant parameters of the hardware facility and an ingenious arrangement effect are combined; arrangement parameters such as the inclination angle and height of the first strip-shaped light source, and the inclination angle and the heightof a first prime lens which are accumulated for many years are adopted; the optimized spot analysis algorithm is used in combination; and therefore, high-quality image acquisition is effectively achieved, and a high-accuracy defect recognition effect is guaranteed.

The invention provides a novel long wave infrared prime camera lens. Three lenses are sequentially arranged along the optical axis from the object side to the image side. The first lens is a meniscus shaped lens with the convex face facing to the object side and with positive refractive power, the second lens is a lens with negative refractive power, and the third lens is a lens with the convex face facing to the image side and with positive refractive power. The lenses satisfy the formulas of 0< FNO*f12*f3* (n1-1) / (f*f*R1) < 1 and 1*10 <-5>< dn1 / dT< 5*10<-5>, wherein f is the focal distance of a whole optical system, n1 is the center wavelength refractive index of a material of the first lens, FNO is the F number of the optical system, f12 is the combined focal distance of the first lens and the second lens, f3 is the focal distance of the third lens, R1 is the approximate curvature radius of the convex face of the first lens, and dn1 / dT is the refractive index temperature coefficient of the material of the first lens. Three types of chalcogenide glass materials are adopted, the structure is simple, the performance is reliable, and the novel long wave infrared prime lens can be applied to the infrared vehicle-mounted assistance, security and protection monitoring field with poor heat dissipation within the wide temperature range.

The application discloses a prime lens and relates to the field of lenses. From the object side to the imaging surface, the lens comprises the following parts of, in order, a first lens having a negative focal length and being a meniscus spherical lens having the concave surface facing the imaging surface; a second lens having a negative focal length and being a biconcave spherical lens; a third lens having a positive focal length and being a biconvex spherical lens; a fourth lens having a positive focal length and being a biconvex spherical lens; a fifth lens having a positive focal length and being a biconvex spherical lens; a sixth lens having a negative focal length and being a biconcave spherical lens; and a seventh lens having a positive focal length and being a biconvex aspherical lens, wherein the second lens and the third lens are bonded through an optical glue, and the fifth lens and the sixth lens are bonded by an optical glue. Through two sets of bonded lenses, the prime lens has a small volume, light weight, very low requirements of processing precision and easy assembling, and can ensure high-quality resolution.

The invention relates to a prime lens. The prime lens consists of a first lens group, a second lens group and a third lens group which are arranged in turn from an amplified side to a reduced side, wherein the first lens group has a plus diopter and comprises a first lens and a second lens which are arranged in turn from the amplified side to the reduced side, and the diopters of the first lens and the second lens are minus and plus respectively; the second lens group has a plus diopter and comprises a third lens, a fourth lens, and a fifth lens which are arranged in turn from the amplified side to the reduced side, and the diopters of the third lens, the fourth lens and the fifth lens are plus, minus and plus in turn; and the third lens group has a plus diopter and comprises a sixth lens, and the diopter of the sixth lens is plus. Due to the design, the prime lens can realize higher imaging quality, larger view angles and smaller telecentric angles.

A fixed-focus lens suitable for projecting an image beam from a light valve onto a screen is provided. The fixed-focus lens comprises a first lens group, a second lens group, and a third lens group arranged in sequence. The third lens group is disposed near the light valve. The first lens group having a negative refractive power comprises at least an aspheric lens. The second lens group having a positive refractive power comprises at least a lens. The third lens group having a positive refractive power comprises at least four lenses. A shortest distance between the first and second lens groups is S1-2, the effective focal length of the third lens group is F3, and S1-2 / F3>1.51. The effective focal length of the lens closest to the screen in the first lens group is F11. The effective focal length of the fixed-focus lens is F, and F11 / F<−l8.5.