258results about How to "Easy to correct" patented technology

The invention discloses a wafer detection scattered light collection objective lens, and relates to the technical field of optical imaging. The scattered light collecting lens is applied to wafer defect detection, the scattered light collecting lens sequentially comprises a first lens group, a second lens group, a third lens group and a fourth lens group from an object plane to an image plane in the optical axis direction of the lens, twelve lenses and an aperture diaphragm, and the twelve lenses and the aperture diaphragm are coaxially arranged; the first lens group is a catadioptric lens group, has positive focal power, and is used for imaging an object plane to an intermediate image plane through two times of reflection. The numerical aperture of the acquisition objective lens provided by the invention is equal to 0.9, the field of view is equal to 2.6 mm, the acquisition objective lens has the characteristics of large field of view, large numerical aperture and small center shielding, the capability of detecting scattered light of defects can be greatly improved, chromatic aberration is corrected by adopting a refraction and reflection mode, and a wider laser bandwidth can be realized compared with a general refraction mode of combining CaF2 and fused quartz.

The invention relates to the technical field of radio orientation, in particular to a measuring method capable of tracking and recording motion trail information of a vibrating rod, which comprises the following steps: arranging at least four UWB (Ultra Wideband) base stations, fixing UWB transmitters at the joint of the vibrating end of the vibrating rod and a rubber tube, and fixing IMU (Inertial Measurement Unit) sensors at the vibrating end of the vibrating rod; according to the data output by the UWB transmitter and the IMU sensor, the position and posture of the vibrating rod in the detected target mold are calculated through a positioning algorithm, and the motion trail of the vibrating rod is further calculated; and according to the vibrating time, the vibrating area and the vibrating area overlapping degree of the vibrating rod, the vibrating state of the concrete is analyzed. The UWB technology and the IMU technology are fused, so that high-precision positioning of the vibrating rod can still be kept under the ground where wireless signals such as GPS signals cannot be transmitted, and the vibrating quality can be conveniently detected and evaluated.

The invention provides a precise and small broadband hyperspectral imager, which is used for solving the technical problem that the existing broadband spectral imager from visible near-infrared to short-wave infrared for sceneries cannot meet the increasingly harsh imaging requirements. According to the small broadband hyperspectral imager, the front optical assembly of an off-axis two-reflection structure and the spectrometer assembly in a free-form surface reflector, optical path multiplexing and axis folding mode are adopted, the number of used lenses is greatly reduced, meanwhile, the length of a spectrometer is effectively reduced, and the imaging precision is improved. The volume and the weight of the spectral imager are greatly reduced; besides, front surfaces and rear surfaces of a first lens and a second lens in the spectrometer assembly are plated with broadband antireflection films from visible near-infrared to short-wave infrared according to light angles, and broadband detection from visible near-infrared to short-wave infrared can be realized in combination with a broadband refrigeration type detector. And the complexity and the installation and adjustment difficulty of the detector assembly and the circuit assembly are greatly reduced.

The invention discloses a connecting structure and a connecting method of an adjustable prefabricated reinforced concrete beam column, a straight thread reverse thread sleeve is directly pre-buried in the prefabricated reinforced concrete beam during factory prefabrication, and no steel bar is exposed at the beam end. The pre-embedded sleeve is reserved on the prefabricated reinforced concrete column, correction of horizontal and vertical installation deviation in the installation process is facilitated, correction of installation deviation in the beam-column connection axis direction is guaranteed through the adjustable connecting piece, and connection length deviation, horizontal deviation and vertical deviation at the joint can be adjusted within a certain range. After a plurality of in-beam longitudinal bars are anchored through the end plates, the in-beam longitudinal bars are converted into a small number of pre-buried straight-thread reverse-thread sleeves, the number of connecting pieces is greatly reduced, and the workload and difficulty of site prefabrication, installation, construction and alignment are remarkably reduced.

The invention discloses a fuzzy evolutionary algorithm-based distribution network operation abnormal data detection method and system based on AP clustering and a DNN algorithm for dynamic iteration of a power grid planning theme, and relates to the technical field of power system data processing. Comprising the steps of obtaining power distribution network operation data, and performing time sequence segmentation; carrying out clustering analysis on historical data of the operation data of the power distribution network, and extracting characteristic curves of various abnormal behaviors; constructing a deep neural network model to carry out abnormal data correction; calculating a slope through a time sequence to construct a characteristic curve; comparing, analyzing and judging whether the power distribution network operation data is abnormal or not according to the similarity; and a deep neural network model is adopted to predict and correct abnormal data. According to the method, the operation data of the power distribution network are automatically classified and identified through the AP clustering algorithm, the number of clusters does not need to be specified in advance, subjectivity caused by manual intervention is remarkably reduced, abnormal data correction is carried out through the DNN algorithm, and the accuracy of data correction is improved.

An integrated emergency control method for a coupling load correlation factor and low-frequency load shedding single-three-phase series-parallel micro-grid group comprises the following steps: taking the sum of economic loss of load shedding during low-frequency load shedding of the micro-grid group, frequency change offset loss and network loss caused by three-phase imbalance as a minimum objective function; establishing a micro-grid group integrated low-frequency load shedding model of the coupling load correlation factors; constructing an integrated low-frequency load shedding meta-model; correcting and dynamically updating the integrated low-frequency load shedding meta-model by adopting an MSALO to obtain an optimal dynamic meta-model and a corresponding low-frequency load shedding optimal target function value; and generating an optimal integrated emergency control strategy through the optimal dynamic meta-model. According to the method provided by the invention, the total economic loss of load shedding and the three-phase unbalance degree can be comprehensively reduced on the premise of ensuring the safety and stability of the system frequency, and the decision response speed is improved.

The utility model relates to a full-automatic pipe cutting machine with a pipe feeding device, which comprises a working table and a pipe cutting assembly, a pipe feeding mechanism is arranged in the working table and comprises a first electric push rod fixedly connected with the working table, the output end of the first electric push rod is fixedly connected with a fixing block located at the bottom of the working table, and the output end of the first electric push rod is fixedly connected with the pipe cutting assembly. Pull rods are hinged to the left and right sides of the fixing block, and sliding seats are hinged to the ends, away from the fixing block, of the pull rods. According to the full-automatic pipe cutting machine with the pipe feeding device, by arranging the pipe feeding mechanism, the automatic pipe feeding function is added to the pipe cutting machine, a to-be-machined pipe is conveniently corrected and automatically pushed, the working intensity of a user is relieved, and the problems that the pipe cutting machine does not have the pipe feeding function, and the pipe cutting efficiency is high in the pipe cutting process of the to-be-machined pipe are solved. The problems that a user needs to push a to-be-machined pipe, the working intensity of the user is increased, potential safety hazards exist, and the practicability of the pipe cutting machine is affected are solved.

The invention relates to the technical field of handbag detection, and discloses an external dimension detection device for wine handbag production and processing, which comprises a machine body, a conveying assembly; the detection assembly is arranged on the surface of the machine body, the detection assembly comprises a detection box, a visual detection camera used for detecting the appearance size of the hand bag is installed at the bottom of the detection box, and a light shield is further installed at the bottom of the detection box; the marking assembly is arranged on the surface of the supporting frame and comprises two adjusting blocks arranged on the top of the supporting frame, a movable rod and a bottom plate are arranged on the inner walls of the adjusting blocks in a penetrating mode, the surface of the movable rod is sleeved with a plurality of rollers, shielding belts are wound on the surfaces of the rollers, one end of each shielding belt is fixedly connected to the surface of the bottom plate, and the other end of each shielding belt is fixedly connected to the bottom plate. And the movable rod is connected with the bottom plate through a connecting rod. According to the invention, the inclined or staggered side folding edge of the hand bag is shielded through the shielding belt, so that the detection accuracy of visual detection on the appearance size of the hand bag is improved.

The utility model discloses a pipe ellipse correcting device which comprises a vacuum box and two correcting parts, one end of the vacuum box is provided with an inlet suitable for entering of pipes, and the other end of the vacuum box is provided with an outlet suitable for exiting of the pipes. The correction parts comprise shaping boxes, and the shaping boxes of the two correction parts are symmetrically mounted outside the two sides of one end of the vacuum box and are arranged close to the inlet; the shaping rolling wheel is arranged in the vacuum box; the guide rods are arranged in the corresponding shaping boxes, and one ends of the guide rods are connected with the corresponding shaping rollers; and the transmission mechanisms are installed in the corresponding shaping boxes, the transmission mechanisms are connected with the other ends of the corresponding guide rods, and the transmission mechanisms are suitable for driving the corresponding shaping rollers to move in the vacuum box through the guide rods. The ellipse correction device can realize ellipse correction in pipe production, is convenient to operate, and improves the product quality.

The invention provides an electrical system of an electric helicopter. The electrical system comprises an electric power system, an intelligent control system, a water cooling system and a low-voltage power distribution system, the electric power system comprises a power battery, a high-voltage box, a controller and a motor and provides a power supply for the whole helicopter, and the transmission system transmits the capacity to the rotor wings to provide lift force for the helicopter; the power battery water cooling system comprises a large water pump, a large water pump controller and a power battery heat exchanger; the motor water cooling system comprises a small water pump, a small water pump controller, a controller heat exchanger, an overflow water tank, an expansion water tank and a radiator. The intelligent control system is composed of a comprehensive management computer and a rotor rotating speed monitor, and the low-voltage power distribution system comprises a 24V storage battery and onboard low-voltage electric equipment; meanwhile, the invention provides an electric helicopter electrical system control method.

The invention relates to the field of pesticide residue detection, in particular to a pesticide residue quantitative determination method and system.The method comprises the steps that the retention time of an internal standard substance is obtained, the retention time of to-be-detected pesticide is corrected according to the retention time of the internal standard substance, and the time range of eluent collection is determined according to the retention time of the internal standard substance and the retention time of the to-be-detected pesticide; after uniformly mixing the eluents, obtaining mass spectrograms of the internal standard substance and the pesticide to be detected through a mass spectrometer; determining a ratio of a preset peak area to an actual peak area in a chromatogram output by the detector according to the concentration of the internal standard substance, performing modal decomposition on the chromatogram output by the detector, gradually approaching the ratio to a target value according to a decomposition result, and obtaining an adjusted chromatogram; and correcting the mass spectrum of the pesticide to be detected by using the mass spectrum information of the internal standard substance, and calculating the content of the pesticide to be detected by using the adjusted chromatogram and the corrected mass spectrum.

The invention belongs to the technical field of gift bag production equipment, and particularly relates to a straight belt inserting mechanism of an intelligent gift bag belt threading machine. A gift bag is arranged on the front side of the main body rack; the feeding assembly, the transferring assembly and the silk sticking assembly are further arranged on the main body rack, the feeding assembly is used for converting silk ribbons into straight ribbons, the transferring assembly is used for transferring the straight ribbons to a gift bag, and the silk sticking assembly is used for sticking the straight ribbons to the gift bag. The feeding assembly is used for processing silk ribbons into straight ribbons, the transferring assembly is used for conveying the straight ribbons to the position close to a gift bag, then the silk attaching assembly is used for attaching the straight ribbons to the gift bag, and therefore the operation of inserting the straight ribbons into the gift bag can be achieved. Therefore, by installing the feeding assembly, the transferring assembly and the silk sticking assembly on the main body rack, the operation of inserting the straight belts into the gift bags can be automatically carried out through a machine, manual participation is avoided, the working efficiency is improved, and the burden of workers is relieved.

The invention provides a deviation rectifying device in a medical dry film production line, and relates to the field of medical dry films. The deviation rectifying device in the medical dry film production line comprises a bottom plate, the upper side of the bottom plate is fixedly connected with a deviation rectifying sensor and a servo motor, the upper side of the servo motor is fixedly connected with a rotating shaft, the upper end of the rotating shaft is provided with a deviation rectifying unit, the deviation rectifying unit comprises a rotating plate, the rotating plate is fixedly connected to the upper end of the rotating shaft, and the rotating shaft is fixedly connected with the rotating plate. Fixing plates are fixedly connected to the upper sides of the left end and the right end of the rotating plate correspondingly, and a connecting rod is rotationally connected between the fixing plates on the left side and the right side. By arranging a servo motor, a rotating shaft, a rotating plate and a deviation rectifying roller, deviation rectifying can be conveniently conducted on a dry film, and by means of a first telescopic rod, first adjusting rollers, a moving block, a sliding rod, a first connecting plate, a second connecting plate and an electric push rod, the first adjusting rollers on the left side and the right side can be conveniently controlled to be close to each other, so that the first adjusting rollers on the left side and the right side limit the side edge of the film; the film stability is improved.

The invention discloses a frequency division synchronous circuit applied to a multi-channel analog-to-digital converter. The frequency division synchronous circuit is composed of three main modules including a frequency division reconstruction circuit, a synchronous signal generation circuit and a clock distribution circuit. A multi-channel analog-to-digital converter needs a reasonably designed clock system to provide a time sequence basis for cooperative work of all modules, however, an existing clock system has the problems of large jitter, fuzzy state, low efficiency and the like, and the multi-channel analog-to-digital converter based on the problems is difficult to meet the requirements of rapidly developed communication and detection array systems. According to the improved clock system, the sampling clock jitter is reduced through the edge reconstruction technology, so that the sampling noise is improved, and the conversion precision is improved; the phase ambiguity of frequency division is eliminated through a synchronization strategy, data processing and correction are facilitated, the device can be controlled to be reset to a specific initial state, and array application is facilitated; through a bus type clock distribution strategy, the number of clock transmission lines is reduced, and the circuit operation efficiency is improved.

The utility model discloses a skin measurer for orthopaedic surgery, which relates to the technical field of orthopaedic surgery equipment and comprises a support frame, a measuring wheel, a measuring mechanism and an unfolding mechanism, the measuring wheel is rotatably arranged on one side of the support frame, and the measuring mechanism is mounted on the support frame and is in transmission connection with the measuring wheel. The measuring mechanism measures the number of rotation turns of the measuring wheel, the unfolding mechanism is arranged on the supporting frame, and a first gear is arranged on the measuring wheel; the unfolding mechanism comprises a second gear, an unfolding arm and an unfolding wheel, the unfolding arm is installed on the supporting frame, the unfolding wheel is rotationally installed on the side, away from the supporting frame, of the unfolding arm, the second gear is rotationally arranged at the side end of the supporting frame and meshed with the first gear, a transmission part is arranged at the side end of the second gear, and the transmission part and the unfolding wheel are in transmission in the same direction. According to the scheme, the skin is measured through contact between the measuring wheel and the skin, and the uneven epidermis can be measured relatively accurately.

Embodiments of the present disclosure provide systems and methods for performing text extraction from an image including text data. A method performed by a processor includes extracting machine-readable text data from an image. The machine-readable text data includes one or more words. The method includes comparing each of the one or more words to a data set including a domain vocabulary database and a language dictionary database to determine a first set of words and a second set of words. The first set of words is words that successfully match available words in the dataset, and the second set of words is words that do not successfully match available words in the dataset. Further, the method includes splitting at least one word in the second set of words into two or more words to determine a third set of words and generating a textual output associated with the image.

The utility model relates to the field of dust removal of screen printing machines, and discloses a dust removal device for a screen printing machine, which comprises two track plates, a plurality of limiting rollers are rotatably connected between the two track plates, a plurality of limiting wheels are respectively and fixedly connected onto the plurality of limiting rollers, and the limiting wheels arranged on two adjacent limiting rollers are arranged in a staggered manner. A positioning roller is rotationally connected between the two track plates and located on one side of the multiple limiting rollers, a feeding mechanism for feeding a plate type printing piece into the center of the screen printing machine for printing is arranged at one end of each track plate, and a dust removal mechanism for removing dust on the surface of the plate type printing piece is arranged between the two track plates. The feeding mechanism and the dust removal mechanism are matched with each other, dust removal and feeding can be carried out at the same time, and the effect of remarkably improving the working efficiency of the screen printing machine is achieved.

The application provides an optical system, comprising: a lens barrel, an inner wall surface of the lens barrel is stepped along an extension direction of an optical axis of the optical system, and a distance from the inner wall surface of the lens barrel to the optical axis gradually increases from an object side to an image side of the optical system; first to fifth lenses sequentially accommodated in the lens barrel from the object side to the image side of the optical system, the fifth lens having a negative focal power; and at least five abutting members, wherein a fourth abutting member is in contact with an image side surface part of the fourth lens, and a fifth abutting member is in contact with an image side surface part of the fifth lens; wherein the effective focal length f5 of the fifth lens, the maximum thickness CP4 of the fourth abutting member, the distance EP45 from the image side surface of the fourth abutting member to the object side surface of the fifth abutting member along the optical axis, and the central thickness CT5 of the fifth lens satisfy: -40 < f5 / (CP4+EP45-CT5) < -5.0. The application solves the problem that high image quality and high stability are difficult to be considered in the prior art.

The utility model relates to a combined table and chair with a correcting backrest, which comprises a chair, the backrest is fixed on the left side of the top surface of the chair, a support component is arranged below the chair, universal wheels are fixed at four corners of the bottom surface of the support component, and the backrest is fixed on the back of the chair. A supporting column is fixed between the center of the bottom face of the seat and the center of the top face of the supporting component, a table body is arranged on the right side of the seat, table legs are fixed to the four corners of the bottom face of the table body, and an adjusting mechanism is arranged on the table body; the adjusting mechanism comprises a fixing assembly arranged on the table body, a supporting assembly arranged on the fixing assembly, an adjusting assembly arranged on the supporting assembly and a limiting assembly arranged on the adjusting assembly. According to the combined table and chair with the correction backrest, the adjusting assembly is arranged, the distance between the backrest and the table body can be adjusted by pulling the connecting rod to enable the T-shaped sliding block to move left and right in the T-shaped sliding groove, and correction can be conveniently conducted according to specific use requirements.

The present invention discloses a semi-open through-hole cover, a sealed wire harness through-hole structure and an installation method thereof. By using a main trunk slot and a plurality of branch trunk slots on the semi-open through-hole cover, each cable of the wire harness can be inserted through the main trunk slot, and then pass through the guide section and the narrowing section of the corresponding branch trunk slot and then be fixed in the corresponding positioning hole, thereby realizing the rapid fixation of the wire harness on the semi-open through-hole cover; the complementary structural boss of the internal component is used to ensure that the sealant poured into the injection ring will not leak into the inner shell of the product through the gap between the cable and the semi-open through-hole cover. Therefore, the present invention can conveniently and quickly realize the assembly of the wire harness and the semi-open through-hole cover, can facilitate the correction of the wrong installation position of the cable of the wire harness, and can ensure that the sealant will not leak into the inner shell of the product, solving the problem that the existing sealed wire harness through-hole structure cannot take into account both the convenience of wire harness assembly and the sealing effect of the sealant.

The invention discloses an objective optical system for a paranasal sinus endoscope, which comprises a first lens group with negative focal power, a second lens group with positive focal power, a diaphragm, a third lens group with negative focal power and a fourth lens group with positive focal power in sequence from an object side, and meets the following conditional expressions: (1) 14.0 lt; vd (RN) lt; 19.6, 19.6; (2) 18.0 lt; vd (RN) lt; 23.3, 23.3; (3) 380 lt; vd (RN) / (ng-nF) lt; 1080, 1080; (4) vd (RP) + vd (RN) lt; 79); (5) f1 / flt; -1.1,...,-1.1; (6) f2 / flt; -2.2,-2.2; (7) 1.92 lt; f < 2 > is 6 / f < lt >; 3; the effect of inhibiting magnification chromatic aberration is achieved, the requirement for a large clear range can be met, and confocal of white light and fluorescent light is achieved; meanwhile, optical shooting guarantee is provided for the paranasal sinus endoscopic medical imaging technology, the completeness and authenticity of optical data are guaranteed, and the effectiveness of the optical data is improved for imaging medical treatment and remote medical treatment.

The application provides a VR detection lens, which comprises, in sequence from an object side to an imaging surface along an optical axis, an aperture, a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power; the lens satisfies the following conditions: 0.8<=|f20 / f|<=1.5, 33<=|f30 / f|<=40, and 4.0<=|f40 / f|<=5.0, wherein f is the focal length of the detection lens, f20 is the focal length of the first lens group, f30 is the focal length of the second lens group, and f40 is the focal length of the third lens group. The application has higher resolution and a larger field of view, can well simulate human eye observation, and realizes batch rapid detection of VR products.

The invention relates to a lifting mechanism for intelligent steel rail finishing and grinding equipment, and relates to the field of steel rail finishing, the lifting mechanism is connected to a support and comprises a driving motor, a tension hollow shaft is coaxially fixed to an output shaft of the driving motor, the outer side of the tension hollow shaft is sleeved with an adjustable support, and the tension hollow shaft is rotationally connected with the adjustable support; the driving motor is fixedly connected with the movable support, the movable support is installed on the support, the tension hollow shaft is coaxially and fixedly provided with a ball screw, the outer side of the ball screw is in threaded connection with a slipknot rod, and the polishing mechanism is installed on the slipknot rod. The lifting mechanism has the effect that the lifting mechanism can be conveniently and simply maintained.

The application discloses a long-focus industrial lens. The long-focus industrial lens is arranged with a first lens group, a diaphragm, a second lens group and a third lens group arranged in sequence along an optical axis from an object plane to an image plane; the first lens group has positive refractive power, the second lens group has negative refractive power, and the third lens group has positive refractive power; and the refractive power of the first lens group, the second lens group and the third lens group is limited to meet a certain proportion range, so that the refractive power can be more reasonably shared, the correction of spherical aberration is facilitated, the incidence angle and the emergence angle of light are reduced without affecting the refractive power of the first lens group, the sagittal aberration is reduced, the correction of field curvature, astigmatism, distortion and chromatic aberration and other aberrations is realized, and finally a long-focus industrial lens scheme with low aberration and high resolution is realized.

The present invention relates to an ultra-wide-angle lens for a mirrorless camera. The ultra-wide-angle lens comprises a first lens group G1 with negative optical power, a second lens group G2 with positive optical power, and a third lens group G3 with positive optical power, which are arranged in sequence along an optical axis from an object side. The first lens group G1 and the second lens group G2 are fixed when an object moves from infinity to a close distance. The relationship between the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 satisfies ‑0.7≤F1 / F2≤‑0.4. The third lens group G3 moves toward the object when the object moves from infinity to a close distance to achieve focusing. The ultra-wide-angle lens has a wide half field of view, a full picture angle of more than 110 degrees, and can well correct various aberrations such as coma, field curvature, and distortion. The ultra-wide-angle lens has a simple structure, is easy to assemble and adjust, can be miniaturized, has high performance, good imaging effect, and low cost, and is conducive to mass production and popular use.

The application discloses a deviation rectifying device of a heat transfer printing machine and relates to the technical field of deviation rectifying devices. The deviation rectifying device comprises a support, connecting plates fixedly connected to the two sides of the bottom of the support, a deviation rectifying mechanism arranged on the inner side of the support, a motor mounted on one side of the support, a groove formed through one side of the support, a bidirectional screw rod fixedly connected to one end of the output shaft of the motor, a guide rod fixedly connected to the inner side of the support, and two screw sleeves threadedly sleeved with the outer side of the bidirectional screw rod and slidably sleeved with the outer side of the guide rod. The deviation rectifying mechanism is arranged, so that workers can adjust the distance between the two screw sleeves according to the size of the object to be subjected to heat transfer printing, thereby facilitating the rectification of objects of different sizes and the expansion of the application range of the device.

The invention discloses a multimodal signal detection device for brain hyperpolarized xenon magnetic resonance imaging, comprising a transmitter coil, a receiving coil, and a control box. A fixed airbag is arranged on the transmitter coil, and the transmitter coil can be quickly installed and removed in a gradient coil by inflating and deflating the fixed airbag, and can be stably placed by an airbag fixing tray and a coil fixing tray, thereby saving time and labor. The receiving coil can be installed on the transmitter coil by a receiving coil positioning slide groove and a slider, and the position of the receiving coil can be changed by sliding. The acquisition of physiological signals and the transmission and reception switching functions are integrated in a single-chip FPGA chip in the control box, so that the transmitter coil transmits radio frequency signals and the receiving coil receives magnetic resonance signals in a time-sharing switching manner, thereby preventing mutual interference, and can also detect the physiological state of animals in real time, provide multi-dimensional information, and improve integration and scalability.

This invention provides a catadioptric shortwave infrared imaging spectrometer, comprising, in order of light incidence, an entrance slit, a plane mirror, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, a grating, and an imaging sensor. The plane mirror, together with the upper portions of the first, second, third, fourth, fifth, sixth, and seventh lenses, forms a collimation system. The grating, together with the lower portions of the seventh, sixth, fifth, fourth, third, second, and first lenses, and the imaging sensor, together form an imaging system. Collimation and imaging share a single lens group, resulting in a compact structure, easier aberration correction, simpler assembly and adjustment, better image quality, lower tolerance sensitivity, and reduced assembly difficulty.

The application discloses a manufacturing method and a using method of a power fitting for stepless adjustment of sag, and belongs to the technical field of power fittings. The power fitting for stepless adjustment of sag comprises a double-end bolt with a rotating disc, the screw rod of the double-end bolt with the rotating disc is connected with a π-shaped nut with the rotating disc at two ends respectively, and the π-shaped nut with the rotating disc and the double-end bolt with the rotating disc are limited by a rotation blocking rod piece. The double-end bolt with the rotating disc mainly comprises a double-end bolt and a rotating disc. The double-end bolt with the rotating disc is manufactured by welding the rotating disc on the nut of the double-end bolt. The π-shaped nut with the rotating disc is installed at two ends of the screw rod of the double-end bolt. The rotation blocking rod piece is installed between the π-shaped nut with the rotating disc and the double-end bolt with the rotating disc. The application can not only greatly reduce the complexity of observation and adjustment of wire sag, but also facilitate correction of the unqualified sag found after acceptance of wire cutting.

This invention provides an imaging lens that can effectively correct aberrations even in close-up photography, and a camera device incorporating the imaging lens. The imaging lens, from the object-side to the image-side, comprises: a front lens group having positive refractive power that remains constant during focusing; an aperture, continuously arranged with the front lens group; a first focusing lens group having positive refractive power; a second focusing lens group having negative refractive power; and a final lens group, arranged on the image-side and having positive refractive power that remains constant during focusing. When focusing from an object at infinity to a closer object, the first and second focusing lens groups move by increasing their spacing from each other. The lens surface of the first focusing lens group on the object-side is concave, and the lens surface of the front lens group on the image-side is concave.