Optical lens assembly

Optical lens assembly

An optical lens assembly includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The object-side surface of the first lens element has a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery.

OPTICAL LENS ASSEMBLY

Optical imaging lens

OPTICAL LENS ASSEMBLY

An optical lens assembly includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The object-side surface of the first lens element has a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery.

Optical lens assembly

OPTICAL IMAGING LENS

An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T and an air gap G is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G≤12.000 and ALT/T≤12.900. 1. An optical imaging lens comprising first , second , third , fourth and fifth lens elements arranged from an object side to an image side in the given order along an optical axis of said imaging lens , each of said first , second , third , fourth and fifth lens elements having an object-side surface facing toward the object side and an image-side surface facing toward the image side , wherein:said image-side surface of said first lens element has a concave portion in a vicinity of the optical axis of said first lens element;said second lens element has negative refractive power;said object-side surface of said third lens element has a convex portion in a vicinity of the optical axis of said third lens element and said image-side surface of said third lens element has a concave portion in a vicinity of a periphery of said third lens element;said fifth lens element has negative refractive power and said image-side surface of said fifth lens element has a concave portion in a vicinity of the optical axis of said fifth lens element;the optical imaging lens comprises no other lenses having refracting power beyond the five lens ...

Precision calibration method of optical motion capture system in large scene

The invention relates to a precision calibration method for an optical motion capture system in a large scene, and belongs to the technical field of optical motion capture systems. The calibration method provided by the invention is suitable for precision calibration of the optical motion capture system in a large-scale complex scene, and can solve the problem that the calibration is difficult due to small camera common-view areas among the areas of the optical motion capture system, long distance between the camera and the target, small number of common-view cameras and the like. Besides, by separately calibrating each area, determining the calibration precision of the optical motion capture system in each area and then performing overall precision calibration of the optical motion capture system in the whole area, the precision calibration of the optical motion capture system in a large scene can be accurately and reliably realized.

Optical imaging lens

An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T2 and an air gap G34 is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G34≤12.000 and ALT/T2≤12.900.

AGV draw gear's anti -back rotation structure

The utility model relates to a AGV draw gear's anti -back rotation structure, including the mounting panel, the motor frame, including a motor, an end cap, a controller, and a cover plate, the outputshaft, the eccentric wheel, the swing span, the linear bearing seat, the guide bar, spring and traction lever, install the motor frame on the mounting panel, the motor is transversely installed to this motor frame, an eccentric wheel is just adorned radially admittedly to this motor output shaft traversing motor frame, the eccentric wheel side is coaxial with the output shaft, still install a linear bearing seat on the mounting panel, coaxial arrangement has the guide bar on this linear bearing seat, a swing span is installed at the traction lever top, coaxial cover is equipped with the springoutside the linear bearing seat between mounting panel and the swing span, the swing span is the shape of bending, its position of bending is located the eccentric wheel below, a ratchet is equippedwith ...

Optical imaging lens

An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T2 and an air gap G34 is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G34≤12.000 and ALT/T2≤12.900.

Sign image recognition and center coordinate extraction method

The invention relates to a sign image recognition and center coordinate extraction method which comprises the steps of: firstly, finding a pixel with maximum gray value in a sign image by using a sign image recognition technology based on boundary searching, searching a boundary of a sign point towards the circumferential direction from the pixel, wherein the pixels contained in the boundary are all pixels included in the sign point; secondly, subtracting the gray values of all pixels in the found sign point from a gray threshold for denoising; and thirdly, calculating and extracting coordinates of a sign center in a pixel plane coordinate system by using a gray weighting centroid method and combining with position information of all pixels through using pixel gray values subtracted from the gray threshold as weights. The method has a small calculation amount and realizes accurate extraction of the coordinates of the sign image center.

Optical lens assembly

An optical lens assembly includes a first lens element, a second lens element, a third lens element, and a fourth lens element from an object side to an image side in order along an optical axis. The first lens element to the fourth lens element each include an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has positive refracting power, and the object-side surface of the second lens element has a concave portion in a vicinity of a periphery of the second lens element. The third lens element is made of glass having an Abbe number greater than 60.

OPTICAL IMAGING LENS

OPTICAL IMAGING LENS

An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T and an air gap G is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G≤12.000 and ALT/T≤12.900. 1. An optical imaging lens , from an object side toward an image side in order along an optical axis comprising: a first lens element , a second lens element , a third lens element , a fourth lens element and a fifth lens element , said first lens element to said fifth lens element each having an object-side surface facing toward said object side to allow an imaging ray to pass through as well as an image-side surface facing toward said image side to allow said imaging ray to pass through , wherein:said image-side surface of said first lens element has a concave portion in a vicinity of the optical axis of said first lens element;said object-side surface of said second lens element has a convex portion in a vicinity of a periphery of said second lens element;said image-side surface of said fifth lens element has a concave portion in a vicinity of the optical axis of said fifth lens element;the optical imaging lens comprises no other lenses having refracting power beyond the five lens elements; and{'b': 34', '34, 'EFL is an effective focal length of said optical imaging lens, TTL is a distance from said object-side surface of said ...

Electric hydraulic jack

The invention discloses an electric hydraulic jack which mainly comprises a hydraulic system and a drive motor, and is characterized in that a diesel engine injection pump is adopted as a power component in the hydraulic system; the power is transmitted to the diesel engine injection pump through a cam mechanism by the drive motor; and an oil liquid pump is transmitted to a jack cylinder body by the diesel engine injection pump. As the diesel engine injection pump, a familiar automotive part is adopted as the power of the hydraulic system, the technical threshold of producing and manufacturing the products is lowered; and the jack is low in price and convenient in maintenance; and the parts standardization is further promoted.

Spherical tank volume automatic measurement method based on lofting principle

The invention relates to an automatic volume measuring method for a spherical tank, and the automatic volume measuring method is based on the staking out principle. The automatic volume measuring method converts the pure measurement problem to staking out and measurement, proposes the concept of a coordinate system of the tank body, reasonably calculates staking out points of the inner surface of the spherical tank and links the measurement and the staking out through the coordinate conversion; and the automatic volume measuring method only needs to manually rotate a total station instrument to measure more than 4 initial points during the whole measurement process, then the system can complete the calculation of measured points, the automatic measurement, the data automatic storage, the volume automatic calculation, the output and other functions, thereby basically realizing the automation. The method can carry out the real-time calculation of the measurement precision of each measurement ...

Plate punching die positioning device for steel structure

The utility model discloses a steel structure plate punching die positioning device which comprises a die holder, one end of the die holder is fixedly connected with an adjusting plate through a bolt, a positioning plate is arranged on the upper side of the adjusting plate, an adjusting nut is welded to the lower surface of one end of the positioning plate, and an adjusting sliding groove is formed in the upper surface of the adjusting plate. An adjusting screw rod is rotationally connected into the adjusting sliding groove through a bearing, an adjusting nut is arranged on the adjusting screw rod in a sleeving mode, one end of the adjusting screw rod is fixedly connected with a worm wheel, and a connecting groove is formed in one end of the adjusting sliding groove; through the arrangement of the adjusting sliding groove, the adjusting hand wheel, the worm, the adjusting nut, the worm wheel and the adjusting screw rod, the adjusting hand wheel is rotated when the device is used, the adjusting ...

Waste gas pollutant on-line monitoring device and use method

The invention relates to the field of waste gas monitoring, in particular to an online monitoring device for waste gas pollutants and a using method, a sampling probe, a sampling pump and a hydrogen flame ionization detector, the hydrogen flame ionization detector comprises a sample pipeline, a hydrogen pipeline and an air pipeline, the hydrogen pipeline is connected to the side face of the sample pipeline, and the online monitoring device further comprises a controller; the side face of the sample pipeline is connected with a first nitrogen pipeline, the first nitrogen pipeline is connected with compressed nitrogen, the first nitrogen pipeline is provided with a first valve connected with the controller, the controller opens the first valve when the interior of the hydrogen flame ionization detector is shut down, and a second nitrogen pipeline is further connected between the compressed nitrogen and the sample pipeline. The device has the following beneficial effects that residual hydrogen ...

Optical imaging lens

Ocular optical system

An ocular optical system has four lens elements, wherein the ocular optical system includes a first lens element having a display-side surface with a convex portion in a vicinity of its periphery, and a third lens element having an eye-side surface with a convex portion in a vicinity of its periphery. In addition, υ1 is an Abbe number of the first lens element, υ4 is an Abbe number of the fourth lens element, and the ocular optical system satisfies the relationship 20.00≤|υ1−υ4|.

OPTICAL LENS ASSEMBLY

An optical lens assembly includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The object-side surface of the first lens element has a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery. 1. An optical lens assembly comprising a first lens element , a second lens element , a fifth lens element , a third lens element , and a fourth lens element in order from an object side to an image side along an optical axis , each of the first lens element to the fifth lens element comprising an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through , lens elements having refractive power of the optical lens assembly consisting of five lens elements described above;the second lens element has negative refracting power;the object-side surface of the fourth lens element having a concave portion in a vicinity of a periphery, [{'br': None, 'HFOV≤25°;'}, {'br': None, 'i': TTL×Fno', 'EFL≤, '()/2.2; and'}, {'br': None, 'i': 'EFL/ALT≤', '2.5≤4.75,'}], 'wherein the optical lens assembly satisfieswherein HFOV is a half field of view of the optical lens assembly, TTL is a distance from the object-side surface of the first lens element to an image plane at the image side along the optical axis, Fno is an f-number of the optical lens assembly, EFL is an effective focal length of the optical lens assembly, and ALT is a sum of a thickness of the first lens element along the optical axis, a thickness of the second lens element along the optical axis, a thickness of the third ...

Wear -resisting type high pressure mining cable

The utility model belongs to the technical field of cable manufacture, concretely relates to wear -resisting type high pressure mining cable. This cable includes many cable cores, and the cable core is by interior conductor, conductor shield, insulating layer, insulation screen and the iron shielded layer of being equipped with in proper order outside to, the cable core outsourcing has the restrictive coating, the insulating layer is made by the EPT rubber material, and the restrictive coating is made by the chloroprene rubber material, conductor shield and insulation screen are made by semiconductive material. This cable high pressure direct access jobsite has reduced the circuit energy losses of cable, can the energy saving. Regard as the sheath of cable with chloroprene rubber, abrasion resistance is high, and the life of cable has been improved to crooked removal of being convenient for. The conductor shield and the insulation screen that set up can avoid the cable to take place partial ...

High temperature resistant flexible cable

The utility model belongs to the technical field of cable manufacture, concretely relates to high temperature resistant flexible cable. This cable includes many cable cores that set up in the covering, the cable core is by interior conductor and the insulating layer of being equipped with in proper order outside to, still be equipped with the restrictive coating around the covering outside, be high temperature resistance glass fibre cloth around the covering, insulating layer and restrictive coating are silicon rubber materials. This temperature -resistant cable can normally be worked under specified high temperature steadily, and signal or power transfer performance are not influenced, can also guarantee that the cable has longer life, possess fine pliability simultaneously, have spreading value and market prospect, create good economic benefits and social.

Optical lens assembly

An optical lens assembly includes first, second, third, fourth and fifth lens elements arranged in sequence from an object side to an image side along an optical axis. Only the first lens element to the fifth lens element have refracting power, wherein the optical lens assembly satisfies: 3.1≤ALT/AAG, wherein ALT is a sum of thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element on the optical axis, and AAG is a sum of four air gaps from the first lens element to the fifth lens element on the optical axis.

Optical lens assembly

Ocular optical system

OPTICAL IMAGING LENS

An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T2 and an air gap G34 is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G34≤12.000 and ALT/T2≤12.900. 1. An optical imaging lens comprising first , second , third , fourth and fifth lens elements arranged from an object side to an image side in the given order along an optical axis of said optical imaging lens , each of said first , second , third , fourth and fifth lens elements having an object-side surface facing toward the object side to allow imaging rays to pass through and an image-side surface facing toward the image side to allow the imaging rays to pass through , wherein:said image-side surface of said first lens element has a concave portion in a vicinity of the optical axis of said first lens element;said object-side surface of said second lens element has a convex portion in a vicinity of the optical axis of said second lens element;said image-side surface of said third lens element has a concave portion in a vicinity of a periphery of said third lens element;said fourth lens element has positive refractive power and said object-side surface of said fourth lens element has a concave portion in a vicinity of a periphery of said fourth lens element;the optical imaging lens comprises no other lenses having ...

Optical imaging lens

An optical imaging lens includes a first lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a second lens of an object-side surface with a convex portion in a vicinity of its optical-axis, a third lens of an image-side surface with a concave portion in a vicinity of its optical-axis, a fifth lens of negative refractive power and with a thickness along its optical-axis larger than that of the second lens. EFL is the effective focal length of the optical imaging lens, TTL is the distance from the object-side surface of the first lens element to an image plane, ALT is a total thickness of all five lenses, the second lens has a second lens thickness T2 and an air gap G34 is between the third lens element and the fourth lens element along the optical axis to satisfy TTL/EFL≤1.000, TTL/G34≤12.000 and ALT/T2≤12.900.

Sign image recognition and center coordinate extraction method

The invention relates to a sign image recognition and center coordinate extraction method which comprises the steps of: firstly, finding a pixel with maximum gray value in a sign image by using a sign image recognition technology based on boundary searching, searching a boundary of a sign point towards the circumferential direction from the pixel, wherein the pixels contained in the boundary are all pixels included in the sign point; secondly, subtracting the gray values of all pixels in the found sign point from a gray threshold for denoising; and thirdly, calculating and extracting coordinates of a sign center in a pixel plane coordinate system by using a gray weighting centroid method and combining with position information of all pixels through using pixel gray values subtracted from the gray threshold as weights. The method has a small calculation amount and realizes accurate extraction of the coordinates of the sign image center.

Identification method of point-distributed coded marks

The invention relates to an identification method of point-distributed coding marks, comprising the following steps of: firstly, determining an initial point set and searching a point 3, a point 1 and a point 2; secondly, searching a point 4 and a point 5; and finally carrying out affine transformation and determining a coded value until all coded marks are identified. By using the method, accurate identification of all coded marks can be realized and the reasonability of the design of all point-distributed coding marks can be verified simultaneously.

Optical imaging lens

Present embodiments provide for an optical imaging lens. The optical imaging lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least one inequality, the optical imaging lens shows better optical characteristics and enlarge field angle the total length of the optical imaging lens is shortened.

Optical lens set

An optical lens assembly includes a first lens of positive refractive power, a second lens of refractive power, at least one of the object surface and the image surface being aspherical, a fourth lens of refractive power, a fifth lens of a concave object surface near its optical-axis and both the object surface and the image surface being aspherical so that the Abbe number υ4 of the fourth lens, the Abbe number υ5 of the fifth lens, an air gap G12 between the first lens and the second lens, an air gap G23 between the second lens and the third lens, an air gap G45 between the fourth lens and the fifth lens, the second thickness T2 of the second lens, the third thickness T3 of the third lens, the fourth thickness T4 of the fourth lens, and the fifth thickness T5 of the fifth lens satisfy 18≤υ4−υ5≤50 and (G12+T2+G23+T3+T4+G45+T5)/G34≤6.3.

Image point matching method for industrial digital photogrammetry

The invention relates to an image point matching method for industrial digital photogrammetry. In the method, distances from image points to be matched to corresponding epipolar planes are utilized as constraint conditions, and images are grouped according to known points. The method comprises the following steps of: firstly, sorting the images into a plurality of groups according to whether containing the same object points; then, combining and matching parts of each group of images with better calculated geometrical quality; and finally, reversely calculating same-name image points on other images by utilizing the object points. By using the method, the matching speed and the matching accuracy can be improved. Proved by tests, compared with an image point matching method based on epipolar constraint, the method has less computation and small error.

Combined measuring method based on three-point resection model

The invention relates to a combined measuring method based on a three-point resection model and belongs to the technical field of engineering measurement. In the method, firstly a laser tracker is employed for respectively measuring true north orientations of three orientation points, and then a gyro theodolite is employed for measuring a horizontal angle and a vertical angle of the three orientation points. Coordinate of an original point of a coordinate system of the gyro theodolite in the coordinate system of the laser tracker, and then a conversion parameter of the coordinate system of the laser tracker relative to a true north coordinate system can be calculated according to the calculated original point and the coordinate of any orientation point, and finally the laser tracker is employed for measuring the coordinate value of a target point of an launching vehicle so that the orientation of a connecting line of the target point in the coordinate system of an instrument is back-calculated ...

Technique for producing runner hub with runner hub core of large-scale bulb through-flow type hydro-turbo generator set

The invention discloses a manufacturing technique for a rotating wheel with rotating wheel body core for large bulb tubular turbine generator unit, which is characterized in that: the rotating wheel body comprises the rotating wheel main body and the rotating wheel body core. The manufacturing technique comprises the processing procedures of: rotating wheel body core; main body of rotating wheel; the assembly of the rotating wheel body core and the main body of the rotating wheel, namely the rotating wheel body; the assembly and positioning of the rotating wheel body core and the main body of the rotating wheel. The invention has the advantages that: the invention not only resolves the process problem, but also greatly enhances the working efficiency, thereby shortening the production cycle.

Preparation of ginkgo and tsao-ko skin care liquid

A skin protecting, beautifying and whitening liquid is prepared from Fructus tsaoko and ginkgo fruit through proportioning, decocting in water for 40 min 6 times, collecting the decocting, adding a raw egg, and stirring. Its advantages are simple preparing process, high effect, quickly taking its effect and no toxic by-effect.

Preparation of ginkgo and tsao-ko skin care liquid

Combined measuring method based on two-point center-alignment model

The invention relates to a combined measuring method based on a two-point center-alignment model and belongs to the technical field of engineering measurement. In the method, firstly a gyro theodolite is employed for accurately measuring a true north orientation [alpha]i of a connecting line between two orientation points in space, and then a laser tracker is employed for measuring coordinate values of the two orientation points in a leveling coordinate system and an orientation angle value [beta]1 of the connecting line between the two orientation points in the coordinate system, and then a conversion parameter (0,0,0,0,0,[partial]), and finally the laser tracker is employed for measuring the coordinate value of a target point of an launching vehicle so that the orientation of the connecting line of the target point in the coordinate system of an instrument is back-calculated and the true north orientation of the connecting line of the target point is calculated according to the conversion ...

Camera module and bracket thereof

The invention relates to a camera module and a bracket thereof. The bracket comprises a barrel, a mounting plate and a voice coil motor, wherein the barrel is provided with a first end face and a second end face; the mounting plate is provided with a first surface and a second surface; the mounting plate is arranged in the barrel; the first surface and the first end face are flush with each other, and construct a connection surface; the mounting plate is provided with a light hole penetrating through the first surface and the second surface; the light hole is used for accommodating an infrared cut-off filter of the camera module; the connection surface is used for connecting the voice coil motor of the camera module; the second end face is used for connecting a circuit board of the camera module; the mounting plate is provided with an air escape hole penetrating through the first surface and the second surface; the air escape hole is independent of the light hole, and is positioned in the ...

Image point matching method for industrial digital photogrammetry

The invention relates to an image point matching method for industrial digital photogrammetry. In the method, distances from image points to be matched to corresponding epipolar planes are utilized as constraint conditions, and images are grouped according to known points. The method comprises the following steps of: firstly, sorting the images into a plurality of groups according to whether containing the same object points; then, combining and matching parts of each group of images with better calculated geometrical quality; and finally, reversely calculating same-name image points on otherimages by utilizing the object points. By using the method, the matching speed and the matching accuracy can be improved. Proved by tests, compared with an image point matching method based on epipolar constraint, the method has less computation and small error.

Identification method of point-distributed coded marks

Anti-glare LED (Light Emitting Diode) panel lamp

The invention discloses an anti-glare LED (Light Emitting Diode) panel lamp. The anti-glare LED panel lamp is characterized in that the opened end of a ladder-platform-shaped shell is provided with a diffusion plate; lamp plate components are uniformly distributed in a cavity body between the diffusion plate and the ladder-platform-shaped shell; and LED optical lenses are arranged on the lamp plate components. The anti-glare LED panel lamp disclosed by the invention has the advantages that due to adoption of the mode that the LED optical lenses are arranged at the top parts of LED lamp beads, compared with the back-light module type light-emitting mode, more parts are omitted, and the production cost is saved; meanwhile, due to increase of the light-emitting angles of the LED lamp beads and secondary dimming to the LED lamp beads, the light of the LED lamp beads diverged onto the diffusion plate through the LED optical lenses is more uniform, so that the occurrence of glare is reduced; ...

Optical imaging lens

Present embodiments provide for an optical imaging lens. The optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least two inequalities, the optical imaging lens shows better optical characteristics, increases the effective focal length and narrows the angle of view while the total length of the optical imaging lens is shortened.

Spherical tank volume automatic measurement method based on lofting principle

The invention relates to an automatic volume measuring method for a spherical tank, and the automatic volume measuring method is based on the staking out principle. The automatic volume measuring method converts the pure measurement problem to staking out and measurement, proposes the concept of a coordinate system of the tank body, reasonably calculates staking out points of the inner surface ofthe spherical tank and links the measurement and the staking out through the coordinate conversion; and the automatic volume measuring method only needs to manually rotate a total station instrument to measure more than 4 initial points during the whole measurement process, then the system can complete the calculation of measured points, the automatic measurement, the data automatic storage, the volume automatic calculation, the output and other functions, thereby basically realizing the automation. The method can carry out the real-time calculation of the measurement precision of each measurement ...

Tracing water quality monitoring bionic fish

The invention discloses a traceability water quality monitoring bionic fish. The whole fish is mainly composed of a visual module, a communication module, a positioning module, a sampler, a pectoral fin steering engine, a sample storage chamber, a stepping motor, a fish body, a tail steering wheel, a U-shaped support and the like. The bionic fish travels along a pipeline according to a tracking algorithm, meanwhile, colored harmless liquid is sprayed out through the spray head, the visual module judges whether damage occurs or not and the damage position according to color changes formed by pressure differences generated at the damage position, and the communication module feeds back videos and the position in time. The top sampling sensor is used for sampling near the damage, so that later-stage pollution degree and pollution element measurement and calculation are facilitated. The device is small, exquisite and flexible, can shuttle in a narrow area, has the function of finding and positioning ...

Optical lens assembly

An optical lens assembly includes a first lens element, a second lens element, a third lens element, and a fourth lens element from an object side to an image side in order along an optical axis. The first lens element to the fourth lens element each include an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has positive refracting power, and the object-side surface of the second lens element has a concave portion in a vicinity of a periphery of the second lens element. The third lens element is made of glass having an Abbe number greater than 60.

OPTICAL LENS SET

An optical lens assembly includes a first lens of positive refractive power, a second lens of refractive power, at least one of the object surface and the image surface being aspherical, a fourth lens of refractive power, a fifth lens of a concave object surface near its optical-axis and both the object surface and the image surface being aspherical so that the Abbe number υ4 of the fourth lens, the Abbe number υ5 of the fifth lens, an air gap Gbetween the first lens and the second lens, an air gap Gbetween the second lens and the third lens, an air gap Gbetween the fourth lens and the fifth lens, the second thickness Tof the second lens, the third thickness Tof the third lens, the fourth thickness Tof the fourth lens, and the fifth thickness Tof the fifth lens satisfy 18≦υ4−υ5≦50 and (G+T+G+T+T+G+T)/G≦6.3. 2. The optical imaging lens set of claim 1 , wherein ALT is a total thickness of all five lens elements from said first lens element to said fifth lens element and said first lens element has a first lens element thickness Talong said optical axis to satisfy ALT/T≦3.7.3. The optical imaging lens set of claim 1 , wherein ALT is a total thickness of all five lens elements from said first lens element to said fifth lens element to satisfy ALT/G≦4.4. The optical imaging lens set of claim 1 , wherein ALT is a total thickness of all five lens elements from said first lens element to said fifth lens element and an air gap Gbetween said third lens element and said fourth lens element along said optical axis to satisfy ALT/G≦9.5. The optical imaging lens set of claim 1 , wherein ALT is a total thickness of all five lens elements from said first lens element to said fifth lens element to satisfy ALT/T≦4.5.6. The optical imaging lens set of claim 1 , wherein ALT is a total thickness of all five lens elements from said first lens element to said fifth lens element and BFL is a distance between said image-side surface of said fifth lens element to an image plane along said ...

OPTICAL IMAGING LENS

Present embodiments provide for an optical imaging lens. The optical imaging lens includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least two inequalities, the optical imaging lens shows better optical characteristics, increases the effective focal length and narrows the angle of view while the total length of the optical imaging lens is shortened. 1. An optical imaging lens , sequentially from an object side to an image side along an optical axis , comprising first , second , third , fourth , fifth and sixth lens elements , each of said first , second , third , fourth , fifth and sixth lens elements having refracting power , an object-side surface facing toward said object side and an image-side surface facing toward said image side , wherein:said image-side surface of said third lens element comprises a concave portion in a vicinity of a periphery of said third lens element;said object-side surface of said fourth lens element comprises a concave portion in a vicinity of the optical axis;said sixth lens element has positive refracting power;said optical imaging lens comprises no other lenses having refracting power beyond said first, second, third, fourth, fifth and sixth lens elements;a distance between said object-side surface of said first lens element and an image plane along the optical axis is represented by TTL, a sum of all gaps between said first to sixth lens elements along the optical axis is represented by AAG, a central thickness of said first lens element along the optical axis is represented by T1, a central thickness of said second lens element along the optical axis is represented by T2, a central thickness of said third lens element along the optical axis is represented by ...

OPTICAL LENS ASSEMBLY

An optical lens assembly includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The object-side surface of the first lens element has a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery. 1. An optical lens assembly comprising a first lens element , a second lens element , a fifth lens element , a third lens element , and a fourth lens element in order from an object side to an image side along an optical axis , each of the first , second , third , fourth and fifth lens element comprising an object-side surface facing the object side and allowing an imaging ray to pass through and an image-side surface facing the image side and allowing the imaging ray to pass through , lens elements of the optical lens assembly are only the five lens elements described above;the object-side surface of the second lens element having a concave portion in a vicinity of the optical axis, [{'br': None, 'HFOV≤25°;'}, {'br': None, 'i': 'EFL/T', '7.3≤4; and'}, {'br': None, 'i': 'AAG/T', '2≤19.5,'}], 'wherein the optical lens assembly satisfieswherein HFOV is a half field of view of the optical lens assembly, EFL is an effective focal length of the optical lens assembly, T4 is a thickness of the fourth lens element along the optical axis, AAG is a sum of a distance from the first lens element to the second lens element along the optical axis, a distance from the second lens element to the third lens element along the optical axis, and a distance from the third lens element to the fourth lens element along the optical axis, and T2 is a thickness of the second lens element along the optical axis.2. ...

OCULAR OPTICAL SYSTEM

An ocular optical system has four lens elements, wherein the ocular optical system includes a first lens element having a display-side surface with a convex portion in a vicinity of its periphery, and a third lens element having an eye-side surface with a convex portion in a vicinity of its periphery. In addition, ν is an Abbe number of the first lens element, ν is an Abbe number of the fourth lens element, and the ocular optical system satisfies the relationship 20.00≤|ν-ν 1. An ocular optical system , applied to imaging rays from a display screen into a pupil of an observer via said ocular optical system , with an eye side facing toward said pupil of the observer and with a display side facing toward said display screen said ocular optical system from said eye side toward said display side in order along an optical axis comprising: a first lens element , a second lens element , a third lens element and a fourth lens element , said first lens element to said fourth lens element each having an eye-side surface facing toward said eye side and allowing the imaging light to pass through , and as well as a display-side surface facing toward said display side and allowing the imaging light to pass through , wherein:said first lens element has a display-side surface with a convex portion in a vicinity of its periphery;said third lens element has an eye-side surface with a convex portion in a vicinity of its periphery;{'b': 1', '4', '2', '1', '4', '2, 'the ocular optical system does not include any lens element with refractive power other than said first lens element, said second lens element, said third lens element and said fourth lens element, ν is an Abbe number of the first lens element, ν is an Abbe number of the fourth lens element, SL is a distance between said pupil of said observer and the display screen, T is a thickness of said second lens element along the optical axis, ALT is a total thickness of all four lens elements, G34 is an air gap between said third ...

Optical lens assembly

An optical lens assembly includes first, second, third, fourth and fifth lens elements arranged in sequence from an object side to an image side along an optical axis. Only the first lens element to the fifth lens element have refracting power, wherein the optical lens assembly satisfies: 3.1≤ALT/AAG, wherein ALT is a sum of thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, and the fifth lens element on the optical axis, and AAG is a sum of four air gaps from the first lens element to the fifth lens element on the optical axis.