414 results about "Astigmatism" patented technology

An ophthalmic lens configured to correct and / or treat at least one condition of the eye (e.g., presbyopia, myopia, hyperopia, astigmatism, binocular vision disorders, night vision image quality, and / or visual fatigue syndrome) comprising: a base power profile; and at least one pulse selected to modify the base power profile.

The invention provides a structure and method for bonding plane mirrors and calibrating angles at the same time, and relates to the technical field of aviation, the structure comprises a frame, an infrared turn-back assembly, a flexible lens pressing ring, a mirror frame, a mirror and a pin gauge, the flexible lens pressing ring and the mirror frame are used for axially positioning the mirror, and the pin gauge is arranged in the radial direction of the mirror. When the glue is injected, the area and the thickness of the glue are accurately controlled, the tension generated on the mirror surface of the reflector after the glue is cured is uniformly distributed, the surface precision of the reflector is ensured, the arrangement of the cover plate can effectively prevent light leakage, stray light is prevented from influencing the imaging quality, and the technical problem that the surface precision is reduced when an existing reflector is installed is solved.

The invention provides a linear optical tweezer astigmatism field regulation and control method based on an optical transmission matrix. The design method comprises the following steps: establishing a 4 * 4 optical matrix for generating a linear optical tweezer astigmatism field and a transmission equation; analyzing the regulation and control rule of the parameters of the optical element on the astigmatism characteristics; collecting a fluorescence slice image of the initial astigmatic light field through an axial tomography scanning method; reconstructing the spatial distribution of the initial image light field; judging whether the light field accords with a preset astigmatism characteristic or not, if not, determining the astigmatism characteristic to be optimized, and adjusting element parameters according to a regulation and control rule; and acquiring the adjusted image of the astigmatism light field again, reconstructing the image, and continuously performing judgment iteration until the image accords with the preset astigmatism characteristic, thereby realizing regulation and control of the astigmatism light field. Matrix optics is used in optimization of a linear optical tweezer image dispersion light field optical system, the limitation of traditional trial and error design is avoided, the method can be applied to the fields of light control technology, light sheet fluorescence microscopic imaging and the like, and the performance of the optical system is improved.

The invention relates to a coaxial four-mirror optical system, which comprises a primary mirror, a secondary mirror, a third mirror, a fourth mirror and an annular diaphragm, all the mirrors and the annular diaphragm are coaxially arranged, both the secondary mirror and the third mirror are provided with light through holes, light is reflected by the primary mirror and then is reflected by the secondary mirror, the third mirror and the fourth mirror in sequence, and the light is reflected by the annular diaphragm. And finally converging and imaging. In the design, through application of the annular diaphragm, edge aberration is reduced, and stray light suppression capability is remarkably enhanced at the same time. The coaxial four-mirror optical system has the advantages of being compact in structure, high in imaging quality, wide in applicability and the like, and is suitable for being applied to multiple fields of aerospace, biomedicine, industrial detection and the like.

Described are toric contact lenses that contain high energy visible (HEV) light absorbing compounds and their use for improving various vision attributes in astigmatic contact lens wearers, such as brightness perception and visual range.

The invention discloses a stray light removing system of a diffractive optical element for beam splitting, which comprises a laser light source, the diffractive optical element for beam splitting, a first focusing element, a diaphragm, a second focusing element and a third focusing element which are sequentially arranged along the direction of a laser light path, and is characterized in that the diffractive optical element is used for splitting incident light into a plurality of sub-beams; a plurality of light through holes used for removing stray light are formed in the diaphragm corresponding to the plurality of sub light beams, the focal lengths of the first focusing element and the second focusing element are the same and are F, the distance between the diaphragm and the first focusing element and the distance between the diaphragm and the second focusing element are the same and are L, and L is equal to F. By forming a 4f filtering system, stray light of each sub light beam is effectively removed, and under the condition that the transmission characteristic of light is not changed, the whole structure is simple, operation is convenient, the yield of machined products is guaranteed, and cost is saved.

The invention relates to a refractive error detection system and method. The refractive error detection system comprises a plurality of lens assemblies and a mobile terminal device. Wherein the multiple groups of lens assemblies are arranged on the front surface or the rear surface of the mobile terminal equipment and are in communication connection with the mobile terminal equipment; wherein each group of lens assemblies comprises a flash lamp, a first camera and a second camera which are arranged along the astigmatism meridian corresponding to each group of lens assemblies, and the lens assemblies are used for collecting eye images; and the mobile terminal equipment is used for inputting the eye image into the completely trained refractive error detection model and acquiring a refractive error detection result output by the refractive error detection model. Through the method and the device, the problems of relatively high detection cost and relatively low detection efficiency of the refractive error in related technologies are solved, and the technical effects of reducing the detection cost of the refractive error and improving the detection efficiency of the refractive error are achieved.

The utility model relates to the technical field of automatic production of contact lenses, in particular to liquid injection and mold closing equipment for light diffusion sheets of contact lenses, which comprises a temporary storage dust removal mechanism for temporarily storing an upper mold, a rotary pickup mechanism for carrying and rotating the upper mold, and a mold closing module for driving the rotary pickup mechanism to move, during rotary mold closing, an upper mold is carried to the temporary storage dust removal mechanism, the temporary storage dust removal mechanism carries out dust removal on the upper mold and then temporarily stores and places the upper mold, the mold closing module drives the rotary picking mechanism to reach the temporary storage dust removal mechanism to obtain the upper mold, the rotary picking mechanism rotates the upper mold to a specified angle, and the mold closing module drives the rotary picking mechanism to place the upper mold on the lower mold. Mold closing is completed; according to the utility model, the overall structure is compact, the functions of temporary storage, dust removal, rotary alignment and placement and die assembly are integrated, and the rapid rotary alignment of the contact lens astigmatism sheet can be completed without redundant turnover and complex actions, so that the processing automation of the astigmatism sheet is improved, and the production and processing efficiency of the contact lens is improved.

The invention discloses an objective lens for wafer surface defect detection, and relates to the technical field of optical devices, the objective lens comprises three lens groups which are sequentially arranged according to the light incident direction, and the focal powers are respectively positive, negative and positive; the first lens group comprises a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power, and the second lens group comprises a fourth lens with positive focal power and a fifth lens with negative focal power. The third lens group comprises a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with positive focal power, and the objective lens formed by arranging the lenses can correct various imaging differences, especially distortion, field curvature, astigmatism, axial chromatic aberration and chromatic aberration of magnification in the process of wafer detection imaging, so that the imaging quality is improved. The high resolution ratio and the large view field are achieved, the view field reaches 40 mm, the theoretical resolution ratio sigma is 3 microns, and the wafer detection efficiency can be greatly improved.

This utility model provides a visual safety guidance device for highway tunnels, relating to the technical field of tunnel guidance devices. It includes a mounting frame installed at the top of the tunnel facing the centerline of the wall at the diversion point, and several reflective modules mounted on the mounting frame. The mounting frame has inverted buckle portions on both sides of its bottom, and recessed holes are equidistantly spaced on the mounting frame, with spring bolt assemblies installed within these recessed holes. Each reflective module consists of a mounting base and a reflector, which are fixed together by bolts. The mounting base has a snap-fit ​​groove extending to both ends on one side corresponding to the recessed hole. This device is installed at the top of the tunnel, connecting to the diversion point at the tunnel's front end. Through the tunnel's lighting and the reflection from the reflectors, it effectively guides the driver's line of sight at the tunnel's front end, preventing collisions caused by obstructed vision or momentary distraction, especially for drivers with poor vision or astigmatism.

The invention discloses virtual image detection equipment, which comprises a front diaphragm; the front lens group is arranged on the second side of the front diaphragm along the optical axis; a rear lens group disposed on a second side of the front lens group along the optical axis; the relay lens group sequentially comprises a relay front group and a relay rear group from the first side to the second side along the optical axis, and the relay front group and the relay rear group are coaxially and fixedly arranged; the refraction adjusting group comprises a first moving component arranged between the relay front group and the relay rear group and a second moving component arranged in the relay rear group; the first moving component comprises a cylindrical mirror which is arranged on the optical axis in a switchable and back-and-forth moving manner, and is used for adjusting the astigmatism diopter; the second moving component is arranged on the optical axis in a front-back moving mode and used for adjusting the diopter of the spherical surface. And the light receiving assembly is arranged on the second side of the relay lens group along the optical axis and is used for receiving the light from the relay lens group to carry out virtual image detection.

The optical detection system and method for suppressing stray light provided in this application include an illumination optical path and an imaging optical path sharing a common objective lens. An illumination beam transmitted along the illumination optical path illuminates the wafer under test through the objective lens and is reflected by the wafer under test to form an imaging beam. The imaging beam is transmitted along the imaging optical path through the objective lens for imaging. By arranging optical wedges in the illumination optical path, the illumination beam is incident at a non-parallel or non-coincident angle to the optical axis of the objective lens. Back-reflected stray light generated by multiple reflections between the lenses inside the objective lens is removed from the imaging optical path, which significantly suppresses back-reflected stray light and eliminates the influence of stray light inside the objective lens on imaging.

This invention relates to the field of precision alignment technology, specifically to an astigmatic differential confocal alignment system and method capable of synchronous imaging. The astigmatic differential confocal alignment system includes: an astigmatic differential confocal optical path system and an imaging optical path system sharing the same objective lens; the astigmatic differential confocal optical path system includes a laser, a collimating and expanding beam system, a polarizing beam splitter cube, a quarter-wave plate, a long-pass filter, a short-pass dichroic mirror, an objective lens, a non-polarizing beam splitter cube, a plano-convex cylindrical lens, and two four-quadrant photodetectors connected in sequence; the imaging optical path system includes a visible light point source, a beam splitter, a short-pass dichroic mirror, an objective lens, a sleeve lens, and a camera connected in sequence; the two optical path systems are coaxial and synchronized. When the defocus error signal FES crosses zero, the camera synchronously acquires a clear morphological image of the surface of the sample under test, achieving synchronization of alignment and imaging.

The invention discloses a large-view-field compound eye telescopic system suitable for daytime observation, and belongs to the technical field of optical system design. The system comprises a primary mirror, a compound eye optical unit, a refraction correction mirror group unit and a photoelectric detector unit which are sequentially arranged along an optical axis. The compound eye optical unit adopts a light splitting reflection cube-corner prism structure, and divides a focal plane of a primary lens into X paths of sub-view fields; the refraction correction lens group unit comprises n correction lens groups with built-in field diaphragms; a concentric annular light barrier group is arranged on the inner wall of the primary mirror chamber. Large-view-field observation is realized through optical splicing of a compound eye structure, strong background stray light in the daytime is remarkably inhibited by utilizing a built-in view field diaphragm and combining multiple scattering absorption of a light barrier group, and the stray light coefficient of the system is lower than 1.11 * 10 <-7 >. The technical problem that an existing optical telescope cannot carry out high-contrast large-view-field observation in the daytime is solved, and all-weather monitoring of near-earth celestial bodies is achieved.

The utility model discloses a kind of visual calibration device of astigmatism eye focal line, comprising: axial position scale board, board face is printed with E-type visual target for distant visual detection;Cross visual target disc, coaxially rotatably embedded in through-hole;Several groups of pinholes, each group is arranged along visual target line two sides straight line, pinhole center connecting line is parallel with corresponding visual target line;Fixed shaft is through cross visual target disc center, and is mechanically connected with transmission device;LED light source, set in axial position scale board back surface.The utility model has beneficial effect: the utility model can provide clear and visible and invariable measured astigmatism eye objective existence astigmatism focal line of the person being examined, and can accurately determine the clear criterion that cross visual target line coincides with the focal line, so as to maximumly improve the accuracy of astigmatism eye astigmatism axial calibration, reduce the deviation of calibration astigmatism axial direction and actual astigmatism axial direction, improve determination accuracy and determination work efficiency.

An information processing device (110) comprises: an optical calculation unit (112) that calculates each of the optical path of light from an imaging field of view in an imaging device that performs imaging using an optical element and the optical path of light from outside the imaging field of view that is outside the imaging field of view, calculates stray light produced by the optical element and a point spread function (PSF) of the optical element, and generates a degraded image in which the stray light and the PSF are applied to an ideal image that is handled as correct answer data in teacher data; a noise image generation unit (113) that generates a noise image including noise predicted to occur in an imaging element of the imaging device during imaging; an image calculation unit (114) that superimposes the noise image on the degraded image to generate a learning image; and a teacher data generation unit (115) that generates teacher data in which the learning image is employed as training data and an image corresponding to the imaging field of view of the imaging device within the ideal image is employed as correct answer data.

The present application provides an optical lens system, comprising: five lenses, the five lenses comprising a first lens to a fifth lens in sequence from an object side to an image side; a plurality of spacers, the plurality of spacers comprising a fourth spacer located on the image side of the fourth lens and in contact with the image side surface of the fourth lens; a lens barrel for accommodating the lenses and the spacers; the Abbe number V4 of the fourth lens and the Abbe number V5 of the fifth lens satisfy: -40 < V4-V5 < -30; the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the inner diameter d4s of the object side surface of the fourth spacer, the outer diameter D4m of the image side surface of the fourth spacer satisfy: -1 < (d4s*D4m) / (f4-f5) < 3; the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, the thickness CP4 of the fourth spacer, the air gap T45 of the fourth lens and the fifth lens on the optical axis, the central thickness CT5 of the fifth lens satisfy: -40 < (R7+R8) / (CP4+T45+CT5) < -18. The present application solves the problem that the rear-end system of the optical lens system in the prior art is prone to stray light.

A firearm-scope-attachable diopter lens device is provided. The device is comprised of an eyepiece-mounted optical accessory configured to affix securely over the eyepiece of a standard firearm scope without requiring any permanent modification to the scope itself. The device comprises a housing with at least one optically-aligned diopter lens, available in a range of diopter strengths to correct myopia, hyperopia, or astigmatism. In certain embodiments, the lens is installed in a removable cartridge that interfaces with the housing via a fastener such as a magnetic ring, twist-lock, or bayonet mechanism. Selective lens tinting may be applied to enhance contrast and reduce glare in varying light conditions. An optional micro-adjustment ring concentrically aligned with the lens permits fine diopter calibration in increments of ±0.25 diopters. A protective flip-up cap with a silent hinge mechanism and optional locking feature is integrated to shield the lens from debris when not in use.

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.

This invention proposes a non-contact in-vehicle alcohol screening device and system. It includes a transmitting module, a receiving module, a main control and power module, a housing, and a light-shielding structure. The alcohol screening device is connected to a remote management platform. The device also includes a communication module for sending test results, test time, and device identification information to the remote management platform. The transmitting module uses dual Class 1 low-power lasers, combined with real-time current monitoring and a self-locking switch in the main control module, providing triple protection for human safety through light source, circuitry, and mechanical operation. This ensures that even direct laser light into the eyes is harmless, meeting the safety and compliance requirements of law enforcement scenarios. The receiving module is equipped with a bandpass filter with a corresponding center frequency to effectively suppress ambient stray light and circuit noise. Simultaneously, the dual-wavelength differential design, through the ratio calculated by the main control module, jointly cancels common interferences such as water vapor and window reflections, significantly improving the reliability of the screening signal in complex environments.

The invention provides a vision change condition monitoring device, and relates to the technical field of vision detection.The vision change condition monitoring device comprises a laser speckle generation system and a cam zoom system.The laser speckle generation system comprises a laser source and a diffuse reflection disc, and the diffuse reflection disc rotates around the center axis of the diffuse reflection disc; and a slit, a field-of-view segmentation inversion system, and a radially rotating third prism, wherein the third prism rotates the incident beam. The laser source emits laser, the laser forms laser speckles after passing through the rotating diffuse reflection disc, the laser speckles form diffraction fringes after passing through the slit, the diffraction fringes are changed into two groups of fringes with opposite movement directions after passing through the view field segmentation inversion system, and the two groups of fringes reach the cam zoom system after passing through the third prism rotating in the radial direction. And finally reaching the fundus retina. The vision change condition monitoring device provided by the invention is simple and reliable, a patient does not need to distinguish the clearness of an image, astigmatism can be measured besides myopia and hyperopia, and the device is convenient to use.

The present invention relates to an optical or Raman micro-spectrometry apparatus (100) comprising an optical microscope objective (10) and an optical spectrometer (20). According to the invention, the micro-spectrometry apparatus comprises an astigmatic optical system (30, 31, 32) arranged outside the optical spectrometer (20, 21), between the microscope objective (10) and the optical spectrometer, the astigmatic optical system (30, 31, 32) being arranged and configured to form an astigmatic image of a light beam transmitted through the microscope objective (10) on the input slit of the optical spectrometer (20, 21), the astigmatic image being elongated by astigmatism in the height direction of the input slit, the optical spectrometer being able to spectrally disperse the astigmatic image and form a spectrally dispersed image of the field of view on the detector, the astigmatic optical system being configured to reduce an optical aberration of astigmatism of the optical spectrometer in the spectrally dispersed image.

1. The name of the design product: flat mirror (terminator astigmatism). 2. The use of the design product: for lighting, reflecting and focusing light. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: design 1 front view. 5. Design 1 is designated as the basic design.

The invention discloses a pressing push type built-in pigment marking pen, belongs to the technical field of medical marking tools, and is suitable for accurate cornea marking before ophthalmology astigmatism intraocular lens implantation operation. The pen comprises a pen cap, a pen holder, a storage tube, a locking plate assembly, a reset spring, a fine needle, a pen point and an annular sealing ring. The pen cap can axially move along the pen holder, an axial guide rib and a conical extrusion surface are arranged on the inner wall of the pen holder, the material storage tube is sealed and filled with biocompatible pigment, the locking plate assembly comprises three elastic clamping pieces, and the reset spring is pre-compressed and sleeved outside the fine needle. The pen cap is pressed to push the fine needle to overcome spring force to move, the locking plate assembly is opened under the action of the extrusion face to allow the fine needle to extend out, the clamping piece resets and locks the fine needle after loosening, and a slightly-sharp structure at the front end of the fine needle pierces the cornea tear film and adheres pigment to complete marking. The marking pen is accurate and stable in marking and convenient to operate, pollution is completely eradicated through the sealing design and the disposable property, and medical safety is guaranteed.

The utility model provides an imaging lens group. The imaging lens group comprises a lens barrel, a lens group and a spacing element group, the lens group is composed of five lenses, and the five lenses are a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side; the spacing element group comprises a second spacing element and a third spacing element; the formula is as follows:-2.8 lt; f2 / f3lt; -1.5,-1.5; 0 lt; f3 / R5lt; 0.3 part; the formula is as follows: 2.8 mmlt; d3 < m > / d < 3m > * EP < 23lt >; the thickness is 6.1 mm. The five-piece imaging lens group solves the problem that stray light is serious due to the fact that a five-piece imaging lens group in the prior art meets the telephoto requirement.

The application discloses a kind of based on machine vision's patch type infrared receiving head appearance detection method and system, belong to computer vision detection field.Method includes: through bottom collimating backlight source irradiation to be measured receiving head, utilize the image of two telecentric cameras of symmetrical arrangement Synchronous acquisition pin;Sub-pixel level feature positioning is carried out to image and rejects reflection false feature point;Based on binocular vision principle, reconstruct the three-dimensional space coordinates of pin end;Adopt lowest multipoint method to construct reference plane, calculate the vertical distance of each pin to reference plane as coplanarity deviation;Deviation and tolerance threshold are compared, and output determination signal.System includes object table, bottom collimating backlight source, double-side telecentric camera, hardware level synchronous trigger unit, image processing and three-dimensional reconstruction unit, coplanarity evaluation and determination unit.The application can high-precision measurement pin coplanarity, eliminate perspective distortion and stray light interference, suitable for on-line full inspection on automatic production line.

The application discloses an objective lens for wafer surface defect detection and relates to the technical field of optical devices.The objective lens comprises three lens groups arranged in sequence according to the light incidence direction, and the optical powers of the three lens groups are positive, negative and positive respectively.The first lens group comprises a first lens with a positive optical power, a second lens with a negative optical power and a third lens with a positive optical power.The second lens group comprises a fourth lens with a positive optical power and a fifth lens with a negative optical power.The third lens group comprises a sixth lens with a negative optical power, a seventh lens with a positive optical power and an eighth lens with a positive optical power.The objective lens formed by the above lens arrangement can correct various imaging aberrations, especially distortion, field curvature, astigmatism, axial chromatic aberration and magnification chromatic aberration, has high resolution and a large field of view, and can greatly improve the detection efficiency of the wafer.

The invention discloses a particle directional and fixed-point transport system and method based on asymmetric astigmatism light field regulation and control, and belongs to the technical field of optical micro-control. The system comprises a laser, a cylindrical lens, a first plano-convex lens, a second plano-convex lens, a first reflector, a second reflector and a microscope objective. The cylindrical lens is controlled in an off-axis mode to enable a light beam to be incident vertically in an off-axis mode, and light intensity deviation perpendicular to the optical tweezer line direction is formed on the focal plane of the cylindrical lens. And converting the offset into light intensity gradient distribution along the optical tweezers line direction by using a reflector group, and generating the asymmetric linear optical tweezers after focusing by a microscope objective. The light field generates a directional net scattering force to drive the particles to move unidirectionally along the optical tweezers line direction while maintaining stable capture of the particles. Active modulation devices such as an acousto-optic deflector and a spatial light modulator are not needed, particle directional transportation can be achieved only through cooperative regulation and control of optical elements, and the device has the advantages of being simple in structure, low in cost and high in light field stability and is suitable for biomedical microoperation and particle control in a micro-fluidic chip.

An electroactive lens having stacked rotating cylindrical electroactive lens elements can provide cylindrical refractive power along more axes than the cylindrical electroactive lens elements themselves. For example, six stacked cylindrical electroactive lens elements (each aligned with a different lens meridian) can produce cylindrical refractive power along fifteen distinct meridians when actuated by a maximum of three at a time. If these fifteen meridians are arranged at 12° increments, the lens stack can provide well-aligned cylindrical refractive power to correct astigmatism along any axis. Each cylindrical electroactive lens element in the stack may include a liquid crystal layer actuated by linear electrodes parallel to each other and orthogonal to both the cylindrical axis and the optical axis of the cylindrical electroactive lens element. The electroactive lens may also include spherical lens elements that provide spherical refractive power in addition to any net spherical refractive power produced by the stacked cylindrical electroactive lens elements.

The invention provides a rectangular field-of-view design method for an ultraviolet non-line-of-sight communication receiving end and application thereof, and belongs to the technical field of wireless optical communication, the method comprises the following steps: pre-determining the center distance length of a light shield and the upper field-of-view angle, the lower field-of-view angle, the left field-of-view angle and the right field-of-view angle of a rectangular receiving field-of-view; based on the center distance length, the upper view field angle, the lower view field angle, the left view field angle, the right view field angle and the width and length of the rectangular light sensing surface, calculating structural parameters of a light shield used for generating the rectangular receiving view field; wherein the structural parameters comprise the upper and lower edge lengths, the left and right edge lengths and the position of a vertical center point of a larger rectangular opening of the light shield. Through the design of the rectangular view field and the accurate matching of the rectangular light-sensitive surface, the photon receiving efficiency is remarkably improved, stray light and electromagnetic interference are effectively inhibited, and thus the signal-to-noise ratio of weak light signal detection and the system sensitivity are improved.