65 results about "Depth of focus" patented technology

Devices and / or systems are used to modify the incoming light through spectacle lenses that utilize at least one auxiliary or regional optical element, to provide extension or elongation of the depth of focus for a myopic eye. Methods are used to correct myopia and control or reduce the rate of myopia progression utilizing extension of the depth of focus provided by the at least one auxiliary or regional optical element configured within, or in conjunction, combination, or juxtaposition with spectacle lenses. An axicon, a light sword element, or a peacock eye element is provided within the regional optical element or a sub-lens. A plurality of axicons, light sword elements or peacock eye elements may be configured within, or in conjunction, combination, or juxtaposition with spectacle lenses.

This disclosure provides systems, methods, and devices for image signal processing that support adjusting a Bokeh effect in image data. In a first aspect, a method of image processing includes receiving a first user input specifying a first depth of focus. A camera is configured with a first aperture size of a plurality of aperture sizes of the camera that is nearest a second aperture size that corresponds to the first depth of focus. The first aperture size is smaller than the second aperture size. Image data representing a scene is received that is captured with the first aperture size of the camera. First modified image data is determined by applying a first blur kernel to the image data. The first modified image data represents the scene at the depth of focus corresponding to the second aperture size. Other aspects and features are also claimed and described.

Medical devices and methods of use are disclosed to exam an eye of a patient. A medical device may include a digital projector as part of an illumination system. A medical device may include one or more cameras as part of an observation system to capture reflected light from the eye. The observation system may include one or more adjustable optical systems. The digital projector may produce a slit of light to be projected onto the eye. The slit of light and the observation system may be focused at a plurality of focal depths within the eye.

A bonding apparatus includes a first holder, a second holder, a mover, an optical system, an adjusting device and control circuitry. The first holder holds a first substrate. The second holder holds a second substrate. The mover brings a first one of the first holder and the second holder closer to a second one of the first holder and the second holder. The optical system images alignment marks provided on the first substrate and the second substrate. The adjusting device adjusts a depth of focus of the optical system. The control circuitry performs an approach processing and an imaging processing. In the approach processing, the control circuitry brings the first one closer to the second one. In the imaging processing, the control circuitry images, during the approach processing, the alignment marks, after locating the first substrate and the second substrate within the depth of focus of the optical system.

Techniques for increasing the depth of focus in an optical system are described. The optical system may be incorporated in a fingerprint scanner. The techniques described herein incorporate one or more switching plates in the optical system to selectively change the depth of focus. Although the switching plates may not have optical power, they can change object plane focal point of the optical system.

A method, apparatus, and software for an in-situ mechanical testing system to characterize heterogeneous deformation at microscale are disclosed. The current intellectual property landscape shows the in-situ mechanical testing of metals and alloys is severely limited to a maximum of about 1% macroscopic strain due to the optical microscopy's low depth of focus. To address this challenge, we disclose a smart imaging system consisting of several novel techniques. The techniques include digitally enhanced effective depth of field, real-time targeting and maintaining of a region of interest to image within the field of view and focus, and a panoramic imaging method to digitally widen the field of view. We also disclose a deformation quantification subsystem to analyze the collected data and quantify deformation characteristics. Finally, an expert system to extract the influence of microstructural features on the elastic-plastic and fracture properties is also disclosed.

A surgical simulation endoscope system is provided that is as effective as a surgical endoscope without the added cost and complexity of a surgical simulation endoscope, comprising an optical housing, a lens, and an image sensor arranged to ensure that the location of the sensor is maintained within the focal depth of the lens without damaging the sensor, and in some cases to provide a tilted and / or rotated field of view.

The present invention provides a phakic intraocular lens based on spatial filtering and a preparation method thereof. The phakic intraocular lens includes an optical body, and the optical body includes an optical surface and an optical surface with a spatial filtering structure. The spatial filtering structure satisfies a filtering function that can change the spatial spectrum of the imaging light beam to expand the depth of focus. The present invention regards the imaging process that is usually refracted by geometric optical rays as an imaging process of wavefront transformation, and by introducing an optical surface with a spatial filtering structure in the phakic intraocular lens as a filter, changing the filtering function of the filtering structure can change the spatial spectrum structure of the imaging light beam, achieving the effects of expanding the depth of focus, enhancing dynamic vision, and simultaneously correcting myopia and presbyopia; having a better visual effect. Moreover, it has strong tolerance to adverse effects such as decentration and tilt; and has a simple structure and good stability.

A method and apparatus to maintain image focus on parts such as wafers, circuit boards, or high-density substrates as the part is being inspected. Focus performance is independent of feature and trace orientation and density. This apparatus can be easily integrated into an inspection system and can maintain focus on parts with high aspect ratio structures and or low or non-reflective insulators. It enables the inspection of high-density fine line products requiring the use of high resolution, high numerical aperture (NA) imaging optics with small depths of focus (DOF) that must be kept in focus during the inspection.

This invention belongs to the field of optical computation and simulation technology, specifically a rotationally symmetric optical field modeling method based on FD-BPM in cylindrical coordinates. This invention uses Matlab as a platform to create models of optical elements, including setting the morphology, refractive index, wavelength, amplitude, and wavefront of the incident light field. Based on beam propagation and the finite difference method with boundary conditions, the near-field and far-field optical fields at arbitrary positions of the rotationally symmetric optical element are calculated. This method can obtain various optical information modulated by the optical element, including intensity and phase information at arbitrary positions in the near and far fields, thereby calculating transmittance, focusing efficiency, depth of focus, and focal spot size. This invention greatly improves the accuracy and computational efficiency of optical simulation, and can significantly shorten the development cycle and reduce experimental costs in the design and optimization of large-aperture, short-wavelength focusing optical elements.

The present invention relates to a composite diffractive intraocular lens having one or more optical magnifications or focal lengths, the lens including: a base lens forming a single focal point; a diffractive lens formed on the base lens, provided with a central region and a diffractive region surrounding the central region, and configured to disperse the single focal point into multiple focal points to form multiple focal points; and an axicon portion formed in the central region to protrude in a central axis direction of the base lens such that a depth of focus is expanded between the multiple focal points.

Systems and methods for grading a gemstone including its clarity are presented. An image capturing device disposed to capture images along a line of sight: a holder to support the gemstone thereon; a manipulator arm, carrying the holder, configured to rotate along a roll axis, and allow for rotation of the holder along a pitch axis: an illumination sub-system comprising a direct illumination arrangement, a dark-field illumination arrangement, and a facet illumination arrangement; and a controller arrangement configured to control the illumination arrangements to generate a plurality of illumination patterns for the gemstone, control the manipulator arm to position the holder for a plurality of orientations of the gemstone, control the image capturing device to capture an image of each of the generated illumination patterns, each of the orientations and each of one or more depths of focus, and process the captured images to grade the gemstone.

The present application discloses a method and device for generating an Airy light needle with a long depth of focus and high aspect ratio. A linearly polarized light emitted from the laser passes through the collimated beam expanding system, and then is incident to the spatial light modulator loaded with a specific phase distribution for complex amplitude modulation. The first-order diffraction light passes through the iris and generates the modulated circular Airy beam at the back focal plane of the first 2-f lens system. The modulated circular Airy beam is focused to generate the Airy light needle with long depth of focus and high aspect ratio, which can be accurately controlled by controlling the parameters of the modulated circular Airy beams. The Airy light needle with adjustable depth of focus and aspect ratio can be applied to optical manipulation and optical imaging.

The invention discloses an optical lens focus consistency detection method and device, and the method comprises the steps: setting a reference light spot size and a light spot change interval according to the size of a focus light spot of a to-be-detected optical lens sample; respectively moving the light spot analyzer along the first direction and the second direction of the optical axis of the optical lens, collecting the size and the position of the light spot in the light spot change interval, calculating the focal length D0 of the to-be-detected lens sample and the focal length Dn of the to-be-detected lens, comparing the focal length D0 of the to-be-detected lens sample with the focal length Dn of the to-be-detected lens, and analyzing and verifying the focal length consistency of the to-be-detected lens. The above method can effectively avoid the problem of a focal depth section near the focus, and greatly improves the detection precision.

The invention relates to the technical field of three-dimensional imaging, and provides a projection light path design method, device and system for volumetric three-dimensional rotary scanning display, which is characterized in that a projection light path of a display picture and a projection screen synchronously rotate around the same axis, so that the light path of the projection light path is not changed in the volumetric three-dimensional rotary scanning display process, and the projection light path is not changed in the volumetric three-dimensional rotary scanning display process. The focal depth problem in volumetric three-dimensional rotary scanning display is solved, the technical route is easy to implement, and meanwhile the method has the cost advantage.

Medical devices and methods of use for examining a patient's eye are disclosed. The medical device can include a digital projector as part of an illumination system. The medical device can include one or more cameras as part of a viewing system to capture reflected light from the eye. The viewing system can include one or more adjustable optical systems. The digital projector can produce a light slit to be projected onto the eye. The light slit and the viewing system can be focused at multiple depths of focus within the eye.

The present invention relates to a method of designing an optical element and said optical element designed to correct presbyopia by extending depth of focus. The method comprises selecting an optical path difference (W(r,θ)) and / or a surface topography (Δ(r,θ)) of the optical element, which is expressed as A·rn·cos⁡(N·θ+ φ), where the values of n, N and A are constants chosen from n≥3, N≥3 and A≠0. The value of A is at least as high for an average angular value of a phase transfer function (PTF) of the ocular optical system formed by the optical element to have an absolute value less than or equal to π / 2 over the entire range of spatial frequencies from 0 cycles / degree to 20 cycles / degree, and at least at a distance from the eye to object (d) in the range of 0.3 m to 6 m.

The present disclosure relates to an intraoral scanning system that is configured to determine three-dimensional surface model and a plurality of focused images. The intraoral scanning system comprising a projector unit configured to emit light onto a dental object, wherein the emitted light includes an infrared wavelength and structured light that includes a first visible wavelength; a first image sensor unit including; a first image sensor configured to acquire first reflected light from the dental object, wherein the first reflected light includes the infrared wavelength, and wherein the first image sensor includes an array of pixels, a micro-lens array arranged in front of the array of pixels and configured to convey the first reflected light to the array of pixels, wherein one or more micro lenses of the micro-lens array directs the first reflected light to one or more pixels of the array of pixels; a second image sensor unit including; a second image sensor configured to acquire second reflected light from the dental object, wherein the second reflected light includes the structured light, a processor unit configured to determine; three-dimensional (3D) data of the dental object based on the second reflected light, a three-dimensional (3D) surface model of the dental object by merging the 3D data, and a plurality of focused images at different focus depth into the dental object by selection of a set of pixels from the array of pixels associated with each microlens of the micro-lens array, and wherein the processor unit is configured to align a position of each of the plurality of focused images to a position in the 3D surface model based on the 3D data.

The present invention discloses a method, apparatus, and storage medium for measuring the three-dimensional spectral intensity distribution of a target space. The measurement method includes: calibrating the measurement device; calibrating the radiation intensity of the imaging device; curve-fitting the function between the refocusing coefficient and the corresponding spatial depth; photographing a uniform white light source and recording the spectral light field white light source image; calculating the similarity between each sub-image in the white light source image and the central reference sub-image of the white light source image and the output correction coefficient of each sub-image; photographing and recording the spectral light field image of the target space, and correcting the spectral light field image of the target space; and calculating and forming the three-dimensional spectral intensity distribution field of the target space according to the corrected spectral light field image. The present invention obtains the spectral energy distribution at different focal depths in the target space, and then through all-focus calculation, obtains the spatial depth information and three-dimensional spectral energy distribution information of the object group in the target space, realizing the measurement of the three-dimensional multi-spectral intensity of the target space.

A method and system for performing spectroscopic ellipsometry (SE) measurements of surface structures of optical elements fabricated on transparent substrates is presented herein. The SE measurement system is configured to detect light from the measured structures without contamination from light reflected from the backside of the transparent substrate. The surface structures of the optical elements include film structures and grating structures fabricated on thin transparent substrates. The SE-based measurement system is configured with a relatively large illumination numerical aperture (NA) and a relatively high demagnification ratio from the illumination source to the measurement spot on the optically transparent substrate. This configuration results in a relatively small measurement spot size, a small depth of focus, and minimizes the amount of light reflected from the backside of the optically transparent substrate. In addition, the relatively small collection aperture size further minimizes the amount of light reflected from the backside that reaches the detector.

The invention discloses a compensation method and a compensation system for improving poor exposure of a wafer surface. The compensation method comprises the following steps: detecting height data of a plurality of preset detection points on a wafer on a workpiece table relative to the workpiece table by using a sensor; determining the height difference of the plurality of preset detection points relative to the focusing plane according to the height difference of the focusing plane of the workpiece table and the exposure equipment and the height data of the plurality of preset detection points relative to the workpiece table; and according to the height difference of the plurality of preset detection points relative to the focusing plane, performing height compensation on the workpiece table when the workpiece table is moved to the position of the preset detection points in the exposure process, so that the height difference of the preset detection points and the focusing plane is within a preset range. According to the invention, micro fluctuation on the surface of the wafer is actively counteracted, the surface of the wafer is ensured to be stably controlled within the focal depth range of exposure equipment in the whole exposure scanning area, and the product yield and the production efficiency are improved.

A device to stimulate the retina comprises one or more light sources coupled to one or more optical elements. The one or more optical elements is configured to illuminate the retina with one or more images at a location away from a fovea of a wearer. In some embodiments, each of the one or more images comprises a depth of focus and a spatial resolution. The one or more images can be formed at a distance anterior to the retina, at a distance posterior to the retina or on the retina. In some embodiments, the depth of focus is less than the distance, and the spatial resolution greater than a spatial resolution of the retina at the location.

The present invention relates to a mask 100 for an extreme ultraviolet (EUV) lithography process in a high or hyper-numerical aperture range. The mask 100 comprises a mask pattern derived from a superposition of the two sub-layouts 120, 130. The first sub-layout 120 comprises a plurality of mask features intended for printing, wherein at least one feature is oriented along a first direction of the mask layout. The second sub-layout 130 includes one or more sub-resolution gratings 140 whose grating lines extend substantially in a second direction of the mask layout covering almost the entire width in the second direction. These sub-resolution gratings 140 are designed to be non-printable in a high or hyper-numerical aperture range. The invention aims to improve lithographic performance by optimizing a mask design under specific imaging conditions, such as optimal focus, highest contrast and depth-of-focus penetration pitch considerations.

Ophthalmic lenses with power profile optimized for visual performance with reduced foveal vision hyperopic blur and optimized peripheral blur anisotropy metric for myopia control, and related methods of design. The lenses include a power profile based on providing a first myopic defocus zone from a fovea-based through-focus visual acuity flatness model in a central optic zone of the lens to increase foveal vision depth of focus, and one or more myopic defocus zones in a peripheral optical zone of the lens from a peripheral blur anisotropy model to optimize peripheral blur anisotropy while also achieving acceptable through-focus quality metrics and visual performance. The first myopic defocus zone function in the central zone is designed to reduce (e.g., minimize) negative defocus in foveal vision to reduce hyperopic blur that may lead to myopia progression. The peripheral myopic defocus zone(s) in the peripheral optical zone is designed to optimize (e.g., reverse) a certain type of peripheral blur anisotropy that may also lead to myopia progression.

The present invention relates to a composite diffractive intraocular lens having one or more optical magnifications or focal lengths, the lens including: a base lens forming a single focal point; a diffractive lens formed on the base lens, provided with a central region and a diffractive region surrounding the central region, and configured to disperse the single focal point into multiple focal points to form multiple focal points; and an axicon portion formed in the central region to protrude in a central axis direction of the base lens such that a depth of focus is expanded between the multiple focal points.

To provide a device and / or a system that corrects incident light passing through a spectacle lens utilizing at least one auxiliary or local optical element so as to expand or extend a depth of focus of short-sightedness.SOLUTION: A method of controlling the speed of progression of myopia by correcting the myopia by the use of expansion of a depth of focus provided by at least one auxiliary or local optical element constituted in a spectacle lens 302 or associatively with the spectacle lens in combination or by juxtaposition uses an axicon, an optical sword element, or a peacock eye element in the local optical element or a sub-lens. The method also uses a plurality of axicons, optical sword elements, or peacock eye elements constituted in the spectacle lens or associatively with the spectacle lens in combination or by juxtaposition.SELECTED DRAWING: Figure 3

An image capture device may detect depiction of a machine-readable optical code within visual content captured by the image capture device. The machine-readable optical code may convey information for lens calibration with another lens attached over the lens of the image capture device. Attachment of the other lens over the lens of the image capture device may change optical properties (e.g., field of view, focus distance, depth of focus, and / or distortion) of the image capture device. The image capture device may perform lens calibration based on the information for lens calibration conveyed by the machine-readable optical code. The image capture device may be dynamically calibrated to capture visual content through the combination of the lens and other lens attached over the lens.

This invention relates to the field of automatic control technology, specifically to a control method and system for a wide-temperature adaptive continuous zoom television camera. The method includes: acquiring the zoom-focus mapping relationship, inherent integrated time delay, mechanical inertia time delay, depth of focus, and absolute position data of the zoom motor of the continuous zoom television camera; calculating transient motion parameters; determining the dynamic lead displacement based on the inherent integrated time delay; deriving the reference and predicted focus positions from the mapping relationship; determining the defocus vulnerability based on the depth of focus; extracting the zoom-focus sensitivity; determining the focus displacement compensation amount based on the transient motion parameters and mechanical inertia time delay; and using the defocus vulnerability to weight and correct the focus displacement compensation amount and superimpose it onto the predicted focus position to generate adaptive feedforward focus target coordinates. This method improves the focus following accuracy in wide-temperature operating conditions and high-dynamic continuous zoom processes.

To provide favorable dynamic display calibration based on eye tracking.SOLUTION: Examples of a light field metrology system for use with a display are disclosed. The light field metrology may capture images of a projected light field, and determine focus depths (or lateral focus positions) for various regions of the light field using the captured images. The determined focus depths (or lateral positions) may then be compared with intended focus depths (or lateral positions), to quantify the imperfections of the display. Based on the measured imperfections, an appropriate error correction may be performed on the light field to correct for the measured imperfections. The display can be an optical display element in a head-mounted display, for example, an optical display element capable of generating multiple depth planes or a light field display.SELECTED DRAWING: Figure 26

It generates light that can be used for accurate and high-precision measurement of the state of a laser beam. [Solution] A light emitter comprising a light-emitting thin film that emits light of a different wavelength from the wavelength of the laser beam when the laser beam is focused by a light condenser and irradiated, wherein the thickness of the light-emitting thin film is 1.1 times or less the depth of focus calculated based on the wavelength of the laser beam and the numerical aperture (NA) of the light condenser. Also, a measuring device for measuring the focused shape of a laser beam comprising a light emitter having a support substrate and a light-emitting thin film formed on one side of the support substrate that emits measuring light of a different wavelength from the wavelength of the laser beam when irradiated by the laser beam, a light-receiving unit having a light-receiving element for receiving the measuring light, and a lens part for imaging the measuring light onto the light-receiving element, wherein the thickness of the light-emitting thin film is less than or equal to the depth of focus of the laser beam.