217 results about "Low distortion" patented technology

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

The invention provides a compact hyperspectral imager optical system and an imaging method thereof, which are used for solving the technical problems that the overall size of a front telescopic assembly in a traditional hyperspectral imager optical system is difficult to compress, the installation and adjustment difficulty is relatively large, or the incident energy is lost and the space coverage capability is insufficient. And the technical problems of low energy utilization rate and difficulty in improving the sensitivity and the signal-to-noise ratio of the hyperspectral imager of the traditional Dyson type dispersion light splitting assembly are solved. The invention provides a compact hyperspectral imager optical system, which comprises an off-axis two-image-reflection telecentric optical path system based on a free-form surface and a Dyson light splitting system based on a curved surface prism, and realizes high regulation and control capability on light through multiple degrees of freedom of a curved surface shape. Compared with the prior art, the high-spectral imaging device has the advantages that the high-spectral imaging device is simple in structure, high image quality, small distortion and good telecentricity are achieved, meanwhile, the curved prism serves as a dispersion light splitting element, the whole spectrum has high light splitting efficiency, and the signal-to-noise ratio and sensitivity of the high-spectral imaging device can be improved.

An information handling system camera provides a 117 degree field of view with low distortion by capturing visual images through a lens having eight lens elements. The first lens element closest to the object, the third lens element and the sixth lens element each have a glass material, the remaining lens elements have a plastic material. The first two lens elements and the last lens element each have a negative refractive power and the remaining lens elements have a positive refractive power. Lens elements two and four through eight each have aspherical surfaces.

The invention discloses a method and a system for optimizing a metering front end of an intelligent electric meter. The method comprises the following steps of: setting an anti-aliasing network with a near-linear phase at the front end of a metering channel and synchronously sampling; determining a range switching window based on zero crossing or a preset voltage change rate, executing automatic range switching in the window, and performing overlapping sampling and digital splicing on samples before and after switching; determining a rectification conduction empty window based on the rectification conduction prediction, suspending sampling in the empty window, and compensating a missing sample; injecting a reference signal into the channel at the calibration injection window, obtaining a correction coefficient according to response, and performing online correction; the three types of windows are not overlapped and are uniformly scheduled by a synchronous time sequence; and completing power and energy calculation according to the corrected voltage and current sequence. The system comprises an anti-aliasing network unit, a range control unit, a rectification conduction detection unit, an air window door control unit, an injection and online correction unit, a time sequence synchronization unit, a metering calculation unit and the like. According to the invention, low-distortion, wide-range and consistent metering output can be realized in practical application.

The invention relates to a 12M large-wide-angle security monitoring lens which sequentially comprises a diaphragm and first to ninth lenses from an object side to an image side, the first and second lenses have negative diopters, the third, fourth, sixth to ninth lenses have positive diopters, and the fifth lens has negative diopter. The aspheric lens is matched to correct aberration and suppress distortion. The working wave band of the lens covers 435-1000 nm, the F number is about 1.3, the maximum imaging circle diameter is about 16.8 mm, the TTL does not exceed about 22 mm, the relative illumination can reach about 39%, the main light angle is about 23 degrees, the lens is adaptive to a 12M large-size sensor, full-view-field high resolution, low distortion and clear imaging under weak light / infrared supplementary light are achieved, and the lens is suitable for security and protection monitoring equipment.

The invention discloses a miniaturized large-target-surface low-distortion aerial photographing lens and module. The aerial photographing lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a diaphragm, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, a fourteenth lens and a fifteenth lens which are sequentially arranged from the object side to the image side along the optical axis. Through reasonable lens structure design and curvature radius control, excellent low distortion performance is realized, and the geometric accuracy of an image is ensured. The design of fifteen lenses is adopted, sufficient design freedom is provided, various aberrations such as spherical aberration are effectively corrected, high resolution is achieved, and a large-target-surface photosensitive element is matched; through focal power distribution and aberration correction, the imaging effect of an edge field of view is remarkably improved, and the definition consistency of the center and the edge of a picture is ensured.

The invention discloses a small low-distortion vehicle-mounted lens, and belongs to the technical field of optical lenses. Comprising a first lens with positive focal power, a second lens with positive focal power, a diaphragm, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with positive focal power which are sequentially arranged from an object plane to an image plane along an optical axis, and the following conditions are met: 0.3 lt; f / TTLlt; 0.4, 4.95 < = TTL / D < = 5.55; wherein f is the focal length of the small low-distortion vehicle-mounted lens, TTL is the total length of the small low-distortion vehicle-mounted lens, D is the entrance pupil diameter, and the unit is mm. The vehicle-mounted lens has the advantages of small size, low distortion, large aperture, high imaging quality and low cost, and is good in working stability in high and low temperature environments.

This speaker system provides high-quality sound reproduction through a novel configuration that suppresses the air spring effect. [Solution] The speaker device of the present invention comprises a housing 1 having a baffle plate 2 on which a speaker unit 3 that vibrates in response to an input electrical signal and outputs sound waves is mounted, and an opening 4 is provided on the bottom surface. A predetermined amount of granular material 6, placed parallel to the opening end 5, closes the opening 4 of the housing 1. Granular material 6 is interposed in the path from the internal space to the external space of the enclosure 1, creating a structure in which the air inside the enclosure 1 is acoustically connected to the outside atmosphere via the granular material 6. This configuration suppresses the air spring effect, making it possible to provide a speaker device that achieves high-quality sound reproduction with low distortion.

This invention discloses a high-definition lens, comprising a first lens, a first cemented lens group, an aperture stop, a fourth lens, and a fifth lens arranged sequentially from the object plane to the image plane; wherein the first lens and the fourth lens have negative optical power; the first cemented lens group and the fifth lens have positive optical power, and the fifth lens has a biconvex structure; the focal length of the lens is f, and the focal length of the first cemented lens group is f. U1 f U1 The following relationship exists between f and f: 0.35 < |f U1 / f|<0.90. The lens formed by this invention is not only compact and economical, but also ensures high imaging resolution, small aperture and low distortion, which can meet the needs of industrial applications and has great market prospects and economic value.

The application discloses a high-resolution oblique-axis optical lens, comprising, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a protective glass and an image sensor; the first lens is a filter; the second lens is a biconvex spherical lens with positive focal power; the third lens is a spherical lens with negative focal power; the fourth lens is a spherical lens with positive focal power; and the fifth lens is a biconcave spherical lens with negative focal power. The technical scheme balances and corrects optical aberrations of all levels by reasonably distributing the focal power of the lenses, reasonably matching the optical materials and shapes, and utilizes the cylindrical lens to correct astigmatism caused by the optical path of the meridian arc vector plane of the protective glass, so that the advantages of large target surface, low distortion, ultra-short object distance, high resolving power and the like of the lens are achieved.

The present invention makes it possible to obtain low noise and low distortion in both of transistors to which a push-pull operation using a balun is applied.　This amplification device comprises: a first field effect transistor in which an input voltage is applied to the gate; a second field effect transistor connected in series to the first field effect transistor; a first inductor connected to the gate of the second field effect transistor; a second inductor connected in series to the source of the first field effect transistor and step-down inductively coupled to the first inductor; and a third inductor connected in series to the source of the second field effect transistor and step-down inductively coupled to the first inductor.

This invention relates to the field of AR device technology, providing an AR optical lens and an AR device. The lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the object side to the image side. The first lens has positive optical power, with a convex surface on the object side and a concave surface on the image side; the second lens has positive optical power, with a convex surface on the object side and a concave surface on the image side; the third lens has negative optical power, with both the object side and the image side being concave; the fourth lens has positive optical power, with a concave surface on the object side and a convex surface on the image side; and the fifth lens has negative optical power, with a concave surface on the object side and a convex surface on the image side. All lenses are aspherical lenses. This invention, through a positive-positive-negative-positive-negative optical power arrangement of lenses, can simultaneously correct various aberrations such as spherical aberration, field curvature, and distortion, effectively achieving a large field of view, low distortion, and high resolution imaging effect, enhancing the immersiveness and clarity of AR displays.

This invention relates to the field of optical imaging technology, and discloses a compact long working distance fixed-magnification lens and its optical system. The optical system includes a front group with positive optical power, a middle group with negative optical power, an aperture stop, and a rear group with positive optical power; the focal length of the optical system is f, the optical rear focal length is BFL, and the focal length of the front group is f0. S1 The focal length of the middle group is f S2 The focal length of the rear element is f. S3 They respectively satisfy the relation: 0.4 < |f S1 / f|<0.75, 1.1<|f S2 / f|<1.7, 1.50<|f S3 / f|<8.00, 0.05<|BFL / f|<0.35. This invention realizes a long working distance fixed-magnification lens with high resolution, a lens magnification of 0.94X, a maximum resolution of 100 lp / mm, can be matched with 5-micron pixel chips, has a maximum target surface size of 1.2″, and also has low distortion performance.

The present disclosure provides a low-distortion PAM-4 optical transmitter with a piecewise compensation scheme for VCSEL-based optical communication links. The input half-rate least significant bit (LSB) and most significant bit (MSB) data streams of the transmitter are firstly encoded into half-rate unary-weighted data streams by thermometer encoders. The half-rate unary-weighted data streams are then fed into three data slices with 2-tap feed-forward equalizer (FFE), continuous-time linear equalizer (CTLE), pre-emphasis circuit for serialization and piecewise pre-distortion. Finally, outputs from the three data slices are added in the form of current and fed into VCSEL. A thermal control loop is implemented to monitor the temperature of the VCSEL as well as provide compensation to the bias current of the VCSEL.

An image processing system includes an imaging unit configured to include an optical system that forms an optical image having a low distortion region and a high distortion region, to be able to capture an image of at least an outer rear side of a movable apparatus in the low distortion region, and to be disposed such that an inside of the movable apparatus is included in an angle of view of the optical system, and a display unit configured to display image signals of the inside and outside of the movable apparatus which are generated by the imaging unit.

The invention discloses a distortion degree calculation method, a chip and electronic equipment, and belongs to the field of video coding and decoding. The method comprises the steps that the residual value between each pair of pixel points occupying the same position in an original pixel block and a predicted pixel block is calculated, a residual pixel block is obtained, the predicted pixel block is obtained by predicting the original pixel block, the original pixel block comprises N * N pixel points, and N is a positive integer; sub-pixel blocks in the residual pixel blocks are cached according to a preset pixel block size, pixel blocks in the sub-pixel blocks are output, and the size of the preset pixel block is smaller than that of the residual pixel blocks; calculating a distortion degree corresponding to a pixel block in the sub-pixel blocks; and according to the distortion degrees corresponding to the pixel blocks in the sub-pixel blocks, calculating the distortion degrees corresponding to the original pixel blocks and the predicted pixel blocks. According to the method, the hardware resource consumption of distortion degree calculation can be reduced.

The invention discloses a large-view-field low-distortion infrared telecentric scanning objective lens which comprises a lens body, the lens body is composed of a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are arranged along an axis, the first lens is a positive lens, the second lens is a negative lens, the third lens is a negative lens, the fourth lens is a meniscus positive lens, and the fifth lens is a negative lens. The fifth lens is a positive lens, and the first lens and the second lens are cemented lenses. According to the invention, through combination of a plurality of lenses and the balsaming lens, high optical index, good temperature adaptability, low distortion, large target surface and large entrance pupil diameter are realized; by reasonably distributing the focal power of each lens and adopting the combination of optical materials with specific refractive index and Abbe number, various aberrations such as spherical aberration, curvature of field, chromatic aberration and the like are effectively corrected, so that high-quality imaging with system RMS wavefront less than 0.02 lambda is realized, the distortion is strictly controlled below 0.02%, and the imaging quality is greatly improved. And a sub-pixel-level accurate positioning capability is realized for high-precision machine vision and measurement detection.

The invention provides a low-distortion pulse generator which comprises a transistor MP1, an S pole of the transistor MP1 is used for connecting a high-voltage power supply end, and a D pole of the transistor MP1 is used for connecting a transducer; the first level translator is used for driving the G pole of the transistor MP1 so as to apply a voltage pulse with a rising edge to the transducer; s poles of the transistor MN1 and the transistor MP1 are grounded, and D poles of the transistor MN1 and the transistor MP1 are connected with a transducer; the second level shifter is used for driving the G pole of the transistor MP2 so as to apply a voltage pulse with a falling edge to the transducer; and the level shifter is used for adjusting the voltage difference VGS between the grid electrode and the source electrode of the transistor so as to realize the time adjustment of the rising edge or the falling edge of the voltage pulse. According to the invention, the voltage difference VGS between the grid electrode and the source electrode of the transistor is adjusted through the level translator to realize the time adjustment of the rising edge or the falling edge of the voltage pulse, so that the slew rates of different edges are adjusted, and the waveform distortion is reduced.

This invention discloses a method and system for adaptive cancellation of strong and weak signals based on complex structures. The method includes: using a complex RLS adaptive filtering algorithm to track and filter strong interference signals in a complex observation signal to obtain a filtered output signal; during filtering, applying a new filter coefficient vector obtained iteratively from the current complex observation signal to the input complex observation signal after a delay of N periods, thereby decoupling the filter coefficient update from the signal filtering in time, allowing the filtering and filter coefficient update processes to be executed asynchronously; subtracting the filtered output signal from the desired signal to achieve adaptive cancellation of strong signals; and extracting weak signal features from the cancelled signal. This invention fully utilizes the complete information of complex signals in amplitude and phase, overcoming the limitations of traditional real-number processing methods in separating overlapping spectrum signals. It is particularly suitable for complex scenarios where strong and weak signals have similar spectra and large power differences, and has the advantages of high precision, low distortion, and strong real-time performance.

This invention discloses a compact waveguide collimation system and its application. The system, along the optical axis, sequentially includes a first lens group, an aperture stop, a second lens group, a prism-equivalent lens, a window protective sheet, and an image plane position. The first lens group effectively corrects aberrations and chromatic aberrations through a combination of a double-layered positive power meniscus lens and a cemented lens. The second lens group uses a negative power biconcave lens for beam expansion combined with a symmetrical lens structure to reduce the difficulty of aberration correction. The system uses spherical mirrors and glass materials throughout. By optimizing the optical power, surface shape, and relative positions, it achieves high collimation, high relative illumination, low distortion, compact structure, and low cost, making it suitable for optical waveguide display systems.

This utility model belongs to the field of optical lens technology and discloses a low-distortion, low-CRA, high-pixel miniaturized lens. It includes a first glass lens, a second plastic lens, a third glass lens, a fourth glass lens, a fifth plastic lens, a sixth plastic lens, and a seventh plastic lens arranged sequentially along the optical axis from the object plane to the image plane. The third glass lens, the fourth glass lens, the fifth plastic lens, and the seventh plastic lens have positive focal lengths, while the first glass lens, the second plastic lens, and the sixth plastic lens have negative focal lengths. The second plastic lens plays a role in correcting distortion, and the seventh plastic lens plays a role in correcting distortion and CRA to a certain extent. Through the curvature system of each lens and the cooperation of multiple plastic sheets, the distortion can be reduced to within 3%, thereby achieving the requirements of low distortion and low CRA in a high-pixel miniaturized lens.

An ultrasonic transceiver that overcomes many of the drawbacks of conventional ultrasonic transceivers by providing the ability to transmit arbitrary waveforms with low distortion, high power, and high frequency, and the ability to monitor the transmitted signal via a receiver during the transmission period. The transceiver circuit includes a transducer element that emits an ultrasonic signal and receives the reflected ultrasonic signal, a transformer circuit having a transformer with a secondary winding and a primary winding coupled to the transducer element, an H-bridge transmission waveform circuit coupled to the primary winding of the transformer to generate a transmission waveform signal to the transducer element via the transformer, an FET clamp coupled to the secondary winding of the transformer, and a receiver circuit having an input coupled to the FET clamp.

The application discloses a collimation system for a diffraction waveguide, which comprises, in order from the object side to the image side along the optical axis, a first lens group, a diaphragm, a second lens group, a prism equivalent lens, a window protection sheet and an image plane position. The first lens group is composed of a positive focal power lenticular lens, a negative focal power meniscus lens and a cemented lens; the second lens group comprises a negative focal power biconcave lens, a positive focal power meniscus lens and a double convex / biconcave lens combination, forming a double Gauss symmetric structure. The total length of the system is less than 90 mm, a global surface mirror design is adopted, the focal length ratio relationship (0.5<|F1 / F0|<2.5, 2.5<|F2 / F0|<4.5) is met, and the ratio of the rear working distance to the focal length is greater than 2. The application is optimized for the diffraction waveguide technology, the cemented lens has stronger chromatic aberration correction ability, the double Gauss structure improves the relative luminance of the edge field of view (>90%), and the total length of the system is shorter (<90 mm), which meets the high-angle precision requirement of the diffraction grating to parallel light, is suitable for AR glasses, vehicle HUD and other scenes, and has the advantages of high collimation, low distortion (<0.15%) and compactness.

The prime lens comprises a first lens group and a second lens group which are sequentially arranged from an object plane to an image plane along an optical axis, the first lens group is used for focusing; the first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from the object plane to the image plane along the optical axis; the second lens group comprises an eighth lens and a ninth lens which are sequentially arranged from the object plane to the image plane along the optical axis; the first lens is a negative-focal-power lens, the second lens is a positive-focal-power lens, the third lens is a negative-focal-power lens, the fourth lens is a negative-focal-power lens, the fifth lens is a positive-focal-power lens, the sixth lens is a positive-focal-power lens, the seventh lens is a positive-focal-power lens, the eighth lens is a negative-focal-power lens, and the ninth lens is a positive-focal-power lens. According to the technical scheme of the invention, a prime lens with large aperture, wide object distance, low distortion and high resolution can be realized, and the use requirements of industrial lenses can be met.

The application provides a large-aperture large-relative-illumination scanning lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and a photosensitive chip arranged in sequence along an optical axis from an object plane to an image plane, wherein the first lens to the tenth lens are all glass lenses, focal lengths of the first lens to the tenth lens are negative, negative, positive, positive, negative, positive, negative, positive, positive and positive in sequence, the first lens, the second lens and the third lens form a fixed group, and the fourth lens to the tenth lens form a focusing group, wherein the floating focusing mode is adopted to optimize distortion and magnification, and small distortion and wide magnification are achieved; through relative movement of the focusing group, clear focusing of a working distance of 150mm-600mm is realized, and the application requirements of wide measurement range, large aperture and low distortion can be met, and the light aperture can also be flexibly adjusted.

The invention relates to the technical field of audio processing, in particular to a user input audio low-distortion processing method oriented to a multi-source noise environment. According to a sound source steering vector under each frequency and a frequency observation column vector of each time frame, a superposed reference signal and a differential reference signal of each time frame under each frequency are obtained; for any frequency, according to energy characteristics of the superposed reference signal and the differential reference signal at different time frames, a signal power spectrum of an initial time frame and a preset acoustic transmission upper limit energy ratio, obtaining an interference existence probability weight of each time frame; and in combination with the noise covariance matrix of the initial time frame, the sound source steering vector and the frequency domain observation column vector, obtaining a noise covariance matrix of the current time frame, and obtaining a target direction enhanced output signal of the current time frame under each frequency. According to the method, the interference existence probability weight is accurately obtained, and the target echo and the external independent interference are accurately distinguished, so that low-distortion speech enhancement is realized.

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

This invention relates to a correction system and method for low image aberration in multi-sided composite rigid optical fibers. The correction system for low image aberration in multi-sided composite rigid optical fibers is characterized by comprising a drawing tower, a high-precision lead screw fixed at its uppermost end, an electric micro-rotation device fixed on the lead screw, a fixing rod on one side of the drawing tower, and a base, a dual-channel laser diameter gauge, and a drawing wheel fixed sequentially from top to bottom on the fixing rod. A heating furnace is mounted on the base. This invention achieves rapid correction of axial image aberration in multifilament fibers by engraving corresponding angle marks on the binding clamps at the upper end of the master rod and then adjusting the angle of the master rod by referring to a graphical representation of a rule derived from the combination of numbers and shapes.

A microscope objective sequentially includes from an exit side to an object side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having negative refractive power, a fifth lens having positive refractive power, a sixth lens having positive refractive power, a seventh lens having negative refractive power, an eighth lens having positive or negative refractive power, a ninth lens having positive refractive power, a tenth lens having positive refractive power, an eleventh lens having negative refractive power, a twelfth lens having positive refractive power, a thirteenth lens having negative refractive power, and a fourteenth lens having positive refractive power. Following relational expressions are satisfied: 1.60≤f9 / f≤4.00; −3.00≤f10_11 / f12_13≤−1.40; −9.00≤(R27+R28) / (R27−R28)≤−1.60; 0.05≤WD / TTL≤0.13; 2.40≤WD*NA≤5.50. The microscope objective has compact structure, has excellent optical performance, and meets the design requirements of low distortion, magnification of 10 times and long working distance.

This application provides a lightweight compression and transmission method, system, and medium for decoration data. The method includes: collecting multi-source data throughout the entire decoration lifecycle; classifying the multi-source data to obtain different types of decoration data; preprocessing the different types of decoration data to obtain preprocessed different types of decoration data; performing differentiated compression processing on the preprocessed different types of decoration data to obtain compressed decoration data blocks; obtaining current network transmission status information and analyzing idle transmission paths based on the current network transmission status information; transmitting the compressed decoration data blocks according to the idle transmission paths to obtain transmission result information; and achieving efficient, low-distortion, and reliable transmission of decoration data through data preprocessing, differentiated compression algorithms, and intelligent transmission strategies, thereby reducing data transmission bandwidth usage and storage costs, and adapting to the data collaboration needs throughout the entire decoration industry lifecycle.