50results about "Refractive power measurement" patented technology

The invention relates to a method for measuring optical lenses (10) using a device (1) comprising: a detection device (11) arranged on a first side (10a) of the lens (10) with respect to a plane of extension of the lens (10); one or more first radiation sources (12) with which the position of the lens (10) in space is determined; and / or a second radiation source (13) with which a planar refractive power distribution of the lens (10) over the surface is determined. According to the invention, a planar, moving pattern extending through the lens (10) is generated by the second or a further radiation source (13), which is detected by the detection device (11) through the lens (10), and one or more defects (15) on the surface of the lens (10) are detected by the computer unit (14).

Methods and systems for measuring the optical quality of an eye based on laser ray tracing are provided herein. Generally, the method uses the steps of temporally detecting the human eye with one or more laser beams in a set of points within the pupil of the eye, detecting projections of the laser beams reflected and scattered from the retina, and processing an image of the detected laser spots. In one embodiment, the components of the system include, but are not limited to, a laser having a dual-axis acousto-optic deflector and a dual-output generator of a digitally synthesized sinusoidal voltage, a collimating optical system, a conjugate telescope system, a polarizing beam splitter, and first and second photosensitive detectors, each component being in operable communication with a processing unit. Another embodiment uses a multi-laser block that does not require laser beam scanning.

A system can perform a method to identify when one or more lenses are the wrong prescription for the user. In some embodiments, the system notifies the user to switch prescription lenses or initiates an enrollment process for the lenses. In some embodiments, the system can identify the prescription of a lens and compare the identified prescription to one or more enrolled prescriptions for the user (e.g., previously defined in user settings associated with user profile). When the identified prescription of the lens does not match an expected enrolled prescription for the user), the system can notify the user to switch prescription lenses. When there are no enrolled prescriptions for the user, the device can prompt the user to enroll the lens.

A method for predicting the lifetime of an EUV pellicle includes a) acquiring transmittance data of an EUV pellicle over a wavelength band ranging from an infrared region to an ultraviolet region, b) acquiring complex refractive index data of the EUV pellicle over the wavelength band ranging from the infrared region to the ultraviolet region, c) acquiring information on the relationship between density and transmittance of the EUV pellicle as a function of wavelength, and d) measuring the transmittance of the EUV pellicle for at least one measurement beam having a wavelength within the wavelength band, extracting an estimated density of the EUV pellicle on the basis of the measured transmittance and the information on the relationship between density and transmittance acquired in the step c), and predicting a remaining lifetime of the EUV pellicle on the basis of the estimated density.

A substrate inspection apparatus includes an optical coherence tomography (OCT) measuring device which outputs a cross-sectional image generated by optical interference between light radiated onto an organic layer on a substrate and reflected light reflected from the organic layer, a memory which stores one or more instructions and a processor which executes the one or more instructions stored in the memory, where the processor sets a reference line extending from a line in contact with one surface of the substrate, on which the organic layer is not disposed, from the cross-sectional image, measures an optical thickness from a first upper line to a lower line of the organic layer in a first area in the cross-sectional image, measures a physical thickness from the first upper line of the organic layer to the reference line, and calculate a refractive index based on the optical thickness and the physical thickness.

The present disclosure relates to a glasses diopter identification method and apparatus, an electronic device, and a storage medium, the method includes: acquiring an image to be processed; the image to be processed is obtained by performing image acquisition on a lens of target glasses under irradiation of a light source, and the image to be processed includes an optical feature generated when the light source emits light to the lens of the target glasses; and inputting input data including the image to be processed to a glasses diopter identification model to obtain a glasses diopter of the target glasses.

The application provides an optical lens measuring device and method, which comprises a light source, a half-wave plate, a polarization beam splitter, a 1 / 4 wave plate, a first mirror, a second mirror, a first beam splitter, a rotating module, a transmittance and reflectance detection module and a chirp detection module, the transmittance, reflectance and chirp are measured by constructing a reflection measurement path and a transmission measurement path and setting a detachable light beam shielding module on the mirror, without the need for recalibration and debugging, a large amount of time is saved, and the detection efficiency is improved. In addition, the rotating module is used to rotate the to-be-measured lens and the corresponding mirror lens, so that different optical parameters can be measured according to different optical lenses and different angles, the detection diversity is increased, the detection complexity is simplified, the cost of manpower and material resources is reduced, and the sustainable development of enterprises is beneficial.

A multi-focus optical detection device (100), comprising a detection area (1), a detection light source (2) and a beam splitter (3) which are arranged corresponding to the detection area (2), two cameras (4, 5) arranged corresponding to the beam splitter (3), and an image processor (6) electrically coupled to the two cameras (4, 5). The detection light source (2) can emit light (L) passing through the contact lens (203). The beam splitter (3) is used for splitting the light to make the light travel synchronously along two light splitting paths (24, 25). The two cameras (4, 5) are respectively located on the two light splitting paths (24, 25) and are used for focusing on the central part and the outer edge part of the contact lens (203), so as to respectively obtain two images (41, 51). The image processor (6) can be used for receiving the two images (41, 51) so as to combine the two images (41, 51) to form a detection image (61) covering the entire contact lens (203). Therefore, the multi-focus optical detection device (100) can use a high-resolution camera having a small depth of field, so as to effectively improve the detection capability.

A system is disclosed for determining optical correction information of optical equipment. The system includes a camera system for capturing at least one camera image, a target, toward which the camera system is directed, a detection area between the camera system and the target for receiving the optical equipment including at least one lens, and a processing system with a searching routine for determining at least one center of the at least one lens based on the at least one camera image of the target via the optical equipment.

The invention relates to a method and to a measuring system for determining the effective focal length (EFL) of an optical system (10), in which an optical measuring device (11) is located in the image-side focal plane (BFP) of the optical system and an input beam (E1) is directed onto the optical system (10) at first and second angles (α1, α2) relative to the direction of the object-side optical axis (OA) and, in each case, the lateral position (x1, y1; x2, y2) of the points of incidence (AP1, AP2) of the associated output beams (A1, A2) on a measuring device (11) are ascertained and the effective focal length (EFL) of the optical system is calculated on the basis of the mutual spacing (formula (I)) of the points of incidence (AP1, AP2) of the first and the second output beams (A1, A2) and on the basis of the formula ΔL = EFL*tan(α2 - α1).

An electronic device may include a variable focus camera that is used during lens measurement operations. During the lens measurement operations, the variable focus camera may capture images of one or more targets with and without an intervening lens. Focus information obtained by the variable focus camera may be used to determine the spherical power, the cylindrical power, and the cylindrical axis of the lens. The focus information may be obtained using a frequency sweep while capturing images of a single target. Alternatively, the focus information may be obtained by performing autofocus operations while focusing on different targets. Based on the determined spherical power, cylindrical power, and cylindrical axis of the lens, the electronic device may output lens information using a display, a speaker, or communications circuitry.

The present invention relates to an apparatus for lens processing, with at least one receiving device for at least one transport box, with at least one measuring device, and at least one processing device. According to the invention it is provided that between the at least one measuring device and the at least one processing device at least one conveying device is provided, that between the at least one receiving device, the at least one measuring device and the at least one conveying device at least one handling device or apparatus is provided in such a way that the at least one measuring device, the at least one conveying device and the at least one processing device can be arranged or are arranged in any number and / or orientation relative to each other. The present invention further relates to a corresponding method for lens processing and to a processing device for lenses.

To provide apparatuses, systems and methods for determining one or more parameters of a lens.SOLUTION: A method of determining one or more optical parameters of a lens is provided, comprising processing at least one depth map including depth information captured via the lens, and determining the one or more parameters of the lens based at least on the depth map.SELECTED DRAWING: Figure 8

The invention relates to a square self-focusing lens refractive index distribution measuring method and device, and the method comprises the steps: generating a laser beam through a laser light source, forming a parallel beam through a beam shaping assembly, and converting the parallel beam into a line focusing beam through a line focusing assembly. The line focusing light beam passes through the square self-focusing lens to be measured, the image acquisition assembly is used for acquiring the profile image of the modulated light beam, and finally the processing assembly is used for processing the image to invert the refractive index distribution. The measuring device comprises a laser light source, a light beam shaping assembly, a line focusing assembly, a sample table and an image acquisition assembly which are sequentially arranged along a light path, and a processing assembly connected with the image acquisition assembly. According to the invention, a non-contact measurement mode is adopted, rapid full-field measurement can be realized, the system structure is simple, the environmental interference resistance is high, and an effective technical means is provided for refractive index distribution measurement of the square self-focusing lens.

A performance evaluation method for a spectacle lens comprising calculating a change rate of a first component and a change rate of a second component with a computer to calculate at least one of a distortion evaluation value and a shaking evaluation value, the first component being a component in a first direction of a prism refractive index, the second component being a component in a second direction of the prism refractive index, the distortion evaluation value being a value for evaluating a distortion regarding a spectacle lens, the shaking evaluation value being a value for evaluating a shaking regarding the spectacle lens.

The invention relates to a device (100) for imaging through an optical system to be tested. The device (100) comprises a first device section (110) with a first degree a transmission for electromagnetic waves and a second device section (120) with a second degree of transmission for the electromagnetic waves, wherein the second degree of transmission is greater than the first degree of transmission. At least one of the device sections (110, 120) has an annular shape.

Method for characterizing at least part of a lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a power based on a prescription of the wearer, and comprising a plurality of optical elements, for example at least twenty optical elements, each optical element of the plurality of optical elements providing one or more optical functions, at least one of which is different from the first optical function, the lens element comprising two surfaces, wherein the method comprises : - obtaining over a measuring pupil positioned on said at least part of the lens element at least a value of the modulation transfer function (MTF) of the lens based on at least one feature of the at least part of the lens element measured over the measuring pupil, - determining a value for an estimator factor over the measuring pupil based on the obtained at least one value of the modulation transfer function (MTF) of the lens over said measuring pupil, - determining for different positions of the measuring pupil on the at least part of the lens element a value of the estimator factor, - characterizing said at least part of the lens element by computing the determined values of the estimator factor at the different positions of the measuring pupil.

A system can perform a method to identify when one or more lenses are the wrong prescription for the user. In some embodiments, the system notifies the user to switch prescription lenses or initiates an enrollment process for the lenses. In some embodiments, the system can identify the prescription of a lens and compare the identified prescription to one or more enrolled prescriptions for the user (e.g., previously defined in user settings associated with user profile). When the identified prescription of the lens does not match an expected enrolled prescription for the user), the system can notify the user to switch prescription lenses. When there are no enrolled prescriptions for the user, the device can prompt the user to enroll the lens.

This method for retrieving at least one optical parameter of an ophthalmic lens comprises: obtaining (10) an image of a first and second patterns by using an image capture device located at a first position; from that image, obtaining (12) a first set of data from at least a part of the first pattern that is seen through the lens by the image capture device and obtaining (14) a second set of data from at least a part of the second pattern that is seen directly i.e. outside the lens by the image capture device; retrieving (16) the at least one optical parameter by using the first and second sets of data and taking account of relative positions of the image capture device, the lens and the first and second patterns.

The invention relates to a method and a measuring system for determining an effective focal length (EFL) of an optical system (10), an optical measuring device (11) being arranged in an image-side focal plane (BFP) of the optical system and an input beam (E1) being directed at the optical system (10) at a first and a second angle (alpha1, alpha2) with respect to the direction of an object-side optical axis (OA), x2, y2) of a point of incidence (AP1, Ap2) of the associated output beam (A1, A2) on the measuring device (11) is determined, and the effective focal length (EFL) of the optical system is calculated from the distance (formula (I)) of the points of incidence (AP1, AP2) of the first and second output beams (A1, A2) from one another and from the formula [delta] L = EFL * tan ([alpha] 2-[alpha] 1).

Techniques for augmented reality waveguide and display light engine metrology are described. In an example, a computer system causes a display light engine to emit first light from a first group of pixels of the display light engine. The computer system determines a first measurement value associated with the first light after the first light is extracted from an optical waveguide. The computer system causes the display light engine to emit second light from a second group of pixels of the display light engine. The second group is different from the first group. The computer system determines a second measurement value associated with the second light after the second light is extracted from the optical waveguide. The computer system generates, based on the first measurement value and the second measurement value, a metrology measurement indicating a property of the optical waveguide.

Examining a light optical element (LOE) may include placing a first slit optically between a projector configured to emit light and the LOE's first major surface and placing a second slit optically between the LOE's second major surface and a detector. Facet parallelism between two facets may be deduced based on a shift of the image reflected from the first facet to the second facet relative to light transmitted normal to the first and second major surfaces through a portion of the substrate not including a facet. Facet refractive index homogeneity or deviation may be deduced based on the light transmitted through the facet relative to light transmitted normal to the first and second major surfaces through a portion of the substrate not including a facet.

The invention discloses an optical CT sensing optical fiber state detection system and method. The system comprises a tunable laser, a first 1 * 2 optical fiber beam splitter, a main interferometer module, an auxiliary interferometer module, a polarization generation and analysis unit and a signal processing control module, an optical signal emitted by the tunable laser is divided into two beams of optical signals through the first 1 * 2 optical fiber beam splitter, and the small-proportion optical signal enters the auxiliary interferometer module; a large-proportion optical signal enters the main interferometer module; an optical signal entering the main interferometer module is divided into two light beams, and one light beam is output into a polarization generation and analysis unit and then is output into an optical CT sensing optical fiber to be measured. The light scattered back by the optical CT sensing optical fiber to be measured is returned to the main interferometer module through the polarization generation and analysis unit, is subjected to interference beat frequency with the other light beam of the main interferometer module, and then enters the signal processing control module; the auxiliary interferometer module and the main interferometer module output electric signals which enter the signal processing control module to be processed.

The present disclosure relates to systems and methods for testing gratings. Gratings, such as those used in waveguide displays, can have a large aspect ratio. For example, grating characteristics (e.g., period, feature size, etc.) can be much smaller than the grating area. Variations in grating characteristics across the grating area can appear like a secondary grating with a long grating period superimposed on the primary grating for which the grating was designed. Because the variations leading to the secondary grating occur over a long distance relative to the primary grating period, it can be difficult to locate and characterize these variations with testing methods designed for shorter distances. The present disclosure proposes systems and methods for quickly and efficiently detecting and characterizing secondary gratings.

The present invention provides a method for determining the refractive index of an optical test object (100) having a first surface (102) and a second surface (104) disposed at a wedge angle (ω) relative to the first surface (102), comprising the steps of: detecting a first reflected light beam (401), a second reflected light beam (402), and a third reflected light beam (413), wherein the first reflected light beam (401) represents a light beam reflected from the first surface (102), and the second reflected light beam (402) represents a light beam reflected from the first surface (102). , representing the light beam reflected by the second surface (104), and a third reflected light beam (413) representing the light beam reflected by the mirror element (420); determining a first angle (a) between the first reflected light beam (401) and the second reflected light beam (402) and determining a second angle (β) using the third reflected light beam (413); and calculating (315) the refractive index (n) using the first angle (a) and the second angle (β).

The invention belongs to the technical field of lens parameter measurement, and particularly discloses a device and a method for measuring the refractive index and the center thickness of an optical lens. Comprising a broadband light source, a narrowband light source, an optical fiber collimator, a first 2 * 2 optical fiber coupler, a second 2 * 2 optical fiber coupler, a 1 * 2 optical fiber coupler, a first wavelength division multiplexer, a second wavelength division multiplexer, an optical fiber end face reflector, a first photoelectric detector, a second photoelectric detector, a rectangular prism, a beam splitter, a first reflector, a second reflector and a third reflector. According to the invention, the functions of measuring key parameters such as the refractive index and the center thickness of the lens are highly integrated in a single coaxial optical path, the refractive index and the center thickness of the lens can be obtained at the same time, equipment replacement or repeated positioning is not needed, and the measurement efficiency is remarkably improved.

The invention relates to a display panel evaluation system and an electronic device. The display panel evaluation system includes: an in-line system; the display panel assembly is arranged on the in-line system; and a brightness measurer configured to capture an image output by the display panel assembly. The display panel assembly includes: a display panel; an evaluation lens disposed on the display panel and configured to refract at least a portion of light output by the display panel; and a polarizing plate disposed on a rear surface of the evaluation lens. The in-line system is configured to sequentially move the display panel such that the display panel overlaps the evaluation lens in a plan view.

This invention provides a method for predicting the lifespan of an extreme ultraviolet pellicle using its transmittance. [Solution] The present invention provides a method for predicting the lifetime of an extreme ultraviolet pellicle, comprising the steps of: a) obtaining transmittance data of an extreme ultraviolet pellicle in a wavelength band from the infrared region to the ultraviolet region; b) obtaining complex refractive index data of an extreme ultraviolet pellicle in a wavelength band from the infrared region to the ultraviolet region; c) performing optical modeling using the transmittance data and the complex refractive index data to obtain information on the relationship between the density and transmittance of the extreme ultraviolet pellicle according to the wavelength; and d) measuring the transmittance of an extreme ultraviolet pellicle to at least one measurement beam having a wavelength belonging to the wavelength band from the infrared region to the ultraviolet region, extracting an estimated density of the extreme ultraviolet pellicle based on the measured transmittance and the information on the relationship between density and transmittance obtained in step c), thereby predicting the remaining lifetime of the extreme ultraviolet pellicle.

Method for characterizing at least part of a lens element, for example a myopia control lens element, adapted for a wearer, said lens element providing a first optical function having a refractive power based on the prescription of the wearer, and comprising a plurality of optical elements, each optical element of the plurality of optical elements providing one or more optical functions, at least one of which is different from the first optical function; wherein the method comprises: - obtaining a two-dimension representation of the local optical power of at least part of the lens element using a deflectometry method or fringe projection profilometry, - determining the optical power distribution over at least part of the two-dimension representation of the lens element in the form of a representation of the data as a histogram or a stem-and-leaf plot; and - characterizing at least the part of the lens element within said at least part of the two-dimension representation of the lens element by analyzing the representation of the data, for example characterizing the histogram or stem-and-leaf plot.

The system and the method for detecting the refractive index of the micro-lens array after processing can be directly used for detecting the refractive index of a formed micro-lens array element. The system comprises a laser (1), an optical fiber coupler (2), a first optical fiber outlet (3), a first collimating lens (4), a first polarizing film (5), a spectroscope (6), a third optical fiber outlet (7), a polarizing spectroscope (8), a first quarter-wave plate (9), a reflector (10), a second optical fiber outlet (11), a second collimating lens (12), a microlens array to be measured (13), a microscope objective (14), a barrel lens (15), a second quarter-wave plate (16), a third quarter-wave plate (17) and a polarization camera (18). A second polaroid (19), a grayscale camera (20), and a computer (21).