17 results about "Focal shift" patented technology

An integrated image sensor and lens assembly may include a lens barrel, a collet, and a lens mount. The lens barrel may be coupled to the collet which is coupled to the lens mount. The lens barrel and the collet may each include a fastening structure reciprocal to each other. Alternatively, the collet and the lens mount may each include a fastening structure reciprocal to each other. The optical distance between the set of lenses and the image sensor may be tuned such that the focal plane of the lenses coincides with the image plane. The fastening structures allow the lens barrel to be adjusted relative to the lens mount in order to shift the focal plane in a direction along the optical axis to compensate for focal shifts occurring during assembly / cure and / or temperature cycling.

A programmable 3D light beam shaping device based on the beamlet printing technology comprises a laser source, the laser source emits initial laser, the polarization state of the initial laser is adjusted through a rotatable half-wave plate, and then the initial laser is separated into an s component light beam and a p component light beam through a first polarization splitting prism, the p-component light beam enters a Dammann grating after being expanded, and a diffracted light beam containing a plurality of diffraction orders is generated; the diffracted light beam sequentially passes through a second polarization splitting prism, a quarter-wave plate and a first focusing element and is introduced into focal shift by a multi-stage phase plate array, and the spatial light modulator is used for adjusting the angle and position offset of subgroups of the light beam of the sub-beam array to generate a working light beam; the working light beam returns to the second polarization splitting prism through the original light path and enters the working area through the second focusing element, and a three-dimensional light field is generated; according to the device, the three-dimensional irradiance distribution in a machining area can be accurately controlled, so that multi-layer and depth-adjustable energy deposition is realized, and the machining quality, efficiency and consistency are remarkably improved.

The present application relates to a kind of color holographic optical elements and its manufacturing method, manufacturing system and correction method, which can solve the problem of focal shift caused by wavelength inconsistency, help to improve the quality of reproduced image.The correction method of the color holographic optical element includes the following steps: adjusting the central ray incidence angle of various color recording light according to the wavelength of color recording light and the wavelength of color reproduction light, to correct the lateral focal shift of color holographic optical element in the process of image reproduction;And adjusting the edge ray incidence angle of various color recording light according to the wavelength of color recording light and the wavelength of color reproduction light, to correct the axial defocus of color holographic optical element in the process of image reproduction.

An integrated image sensor and lens assembly may include a lens barrel, a collet, and a lens mount. The lens barrel may be coupled to the collet which is coupled to the lens mount. The lens barrel and the collet may each include a fastening structure reciprocal to each other. Alternatively, the collet and the lens mount may each include a fastening structure reciprocal to each other. The optical distance between the set of lenses and the image sensor may be tuned such that the focal plane of the lenses coincides with the image plane. The fastening structures allow the lens barrel to be adjusted relative to the lens mount in order to shift the focal plane in a direction along the optical axis to compensate for focal shifts occurring during assembly / cure and / or temperature cycling.

An apparatus includes a curved lightguide having a curved collimator configured to receive and collimate display light from a light source. A color correcting lens is disposed between the light source and an entrance surface of the curved collimator. The color correcting lens compensates for wavelength-dependent focal shifts by directing red, green, and blue portions of the display light to substantially overlap at a common focal plane of the curved collimator. Embedded freeform features configured as total internal reflection mirrors are provided within the curved collimator to collimate the display light. A pupil replicator is disposed within the curved lightguide and configured to expand an exit pupil based on the collimated display light.

A programmable 3D beam shaping device based on beamlet printing technology, comprising a laser source, the laser source emits initial laser, the initial laser adjusts the polarization state through a rotatable half-wave plate, and then is separated into orthogonal s component beam and p component beam through a first polarization beam splitter prism; the p component beam is expanded and then enters a Dammann grating to generate a diffraction beam containing several diffraction orders; the diffraction beam passes through a second polarization beam splitter prism, a quarter-wave plate and a first focusing element in turn, introduces focal shift by a multi-stage phase plate array, adjusts the angle and position offset of the sub-group of the sub-beam array beam by a spatial light modulator to generate a working beam, the working beam returns to the second polarization beam splitter prism from the original light path and is emitted into a working area by a second focusing element, generating a three-dimensional light field; the device can accurately control the three-dimensional irradiance distribution in the processing area, thereby realizing multi-level and depth-adjustable energy deposition, and significantly improving the quality, efficiency and consistency of processing.

The present invention discloses an ultra-wide-angle day / night confocal security lens. The lens comprises, arranged from front to back, a meniscus positive lens, a first biconcave negative lens, a concave-convex positive lens, a first concave-convex negative lens, a second concave-convex negative lens, a first biconvex positive lens, a second biconvex positive lens, a third biconvex positive lens, a second biconcave negative lens, and a flat protective glass. The lens achieves a broad confocal design for visible and near-infrared light, with a negligible near-infrared focal shift of 9.86 μm. It also achieves 110° ultra-wide-angle imaging and a relative illumination of better than 98% across the entire field of view, providing uniform high brightness for security lenses.

The invention discloses a large-depth wide-field-of-view spectrum confocal microscopic endoscopic optical system and an imaging method. Large-angle incident light is deflected after passing through the curved convex surface of the spherical positive lens of the front lens group, and tends to be gentle relative to the optical axis, so that distortion is corrected; the transition mirror adopts an aspheric surface, further performs residual aberration correction on the incident light beam, and inhibits residual spherical aberration of the front lens group; the rear lens group adopts a concentric structure to correct residual aberration, and adopts a flat-field thick lens to correct field curvature. Materials of optical elements of the system are matched and designed to further enlarge the color focal shift of the system, axial separation is generated at convergence positions of different wavelengths, axial light splitting of light beams of different wavelengths is achieved, the light beams are finally converged on an image plane for imaging, and the color focal shift larger than 1 mm is obtained. By adopting the matching design between the lens group structure and the material, large-depth, wide-view-field and high-resolution microscopic endoscopic imaging is realized, more comprehensive tissue information can be obtained, and the clinical diagnosis requirement is met.

The present invention relates to a deformable image sensor, a manufacturing method thereof, and a camera module including same, the deformable image sensor comprising: an image sensor layer including an image sensor region in which a photoelectric conversion element is formed; a ground layer formed in contact with one side of the image sensor layer, which is opposite to the other side of the image sensor layer on which the image sensor region is formed; and a piezoelectric layer formed in contact with the other side of the ground layer, which is opposite to the side in contact with the image sensor layer, wherein the shape of the image sensor region is deformed according to the voltage applied to the ground layer and the piezoelectric layer. The present invention can mitigate tilt defects of the image sensor caused by incorrect calibration, peripheral light fall-off and focal shift of the image sensor due to the curvature of the upper surface of a lens unit, and warpage of the image sensor generated in the manufacturing process of the camera module.

Multiple calibration methods for particle imaging apparatuses are proposed, which allow a lateral focal shift to be determined depending on a focusing setting change or a refocusing of a particle imaging apparatus Distortions in particle-optical images created by correspondingly calibrated particle imaging apparatuses can be reduced in this way, and metrological examinations in the particle-optical images and in particular in 3D tomographic images may be implemented with greater accuracy. Using correspondingly calibrated particle imaging apparatuses, it is possible in particular to measure 3D samples such as deep channels in semiconductor samples more accurately. It is also possible to calibrate and hence correct distortion effects that arise on account of sample geometries in electrostatic immersion fields.

The invention belongs to the technical field of thermal effect compensation methods, and particularly relates to a design method of a thermal compensation lens for a D-shaped collimating lens. A design method of a thermal compensation lens for a D-shaped collimating lens comprises the following steps: determining a focal length of a main lens after focal shift according to a refractive index variation and a curvature radius variation of the main lens caused by a thermal effect under the working power of a laser; setting the combined focal length of the main lens and the compensation lens to be equal to the initial focal length of the main lens; the compensation lens is coaxially arranged behind the main lens, and the design of the thermal compensation lens is completed by adjusting the focal length of the compensation lens and the distance between the compensation lens and the main lens. The compensation lens is coaxially arranged behind the main lens, a two-degree-of-freedom adjusting mechanism is established, namely, the focal length and the distance of the compensation lens are compensated, parameters are dynamically matched through a focal length formula of the combined optical system, the focal length of the system is made to be equal to the initial focal length of the main lens all the time, and the influence of thermally-induced focal shift on the light beam quality is thoroughly eliminated.

An ophthalmic lens includes an optic with a first surface, a second surface, and a phase-shift structure having one or more phase-shift regions. A method for fabricating an ophthalmic lens includes designing an optic with a first surface, a second surface, and a phase-shift structure having one or more phase-shift regions. The phase-shift regions may be adapted to generate respective chromatic focal shifts such that an incident radiation in a respective wavelength range at least partially converges towards a respective selected wavelength. The method includes determining a chromatic aberration target for the optic and determining the quantity of the phase-shift regions meeting the chromatic aberration target. The optic is formed with the phase-shift regions having respective optimal heights obtained based in part on an overall interaction effect. The phase-shift structure may be adapted to increase a depth-of-focus of the optic in the direction of extension.

The present invention relates to the field of optical technology, and discloses a thermal lens effect testing system and method to improve compatibility and ensure measurement accuracy. The system includes: first and second branches inputting a second PBS; a third PBS located between the second output beam of the second PBS and a third beam expander; a first beam quality analyzer is provided on the first output beam of the second PBS to assist in calibrating the light spots of the two input branches; wherein the output beam of the third beam expander enters the second beam quality analyzer disposed on a second electric displacement platform via a focusing lens; a first electric displacement platform for placing a sample to be tested is disposed between the second PBS and the third PBS; the second electric displacement platform is used to reposition the focus of the beam with the assistance of the second beam quality analyzer after the thermal lens effect of the sample to be tested on the first electric displacement platform is stabilized, so that the distance between the repositioned focus and the initial focus is determined as the focal shift.

This invention relates to the field of laser ranging optics, and discloses an off-axis, focusless, multi-band adaptive laser emission system, comprising a multi-band laser, a folded-axis optical path assembly, an emitting negative lens assembly, an off-axis Reflective-C-Reflective Optical System, a laser beam splitter assembly, a monitoring camera assembly, and a back-reflection calibration assembly. The system employs an off-axis Reflective-C-Reflective Optical Structure, with an emitting negative lens positioned at the laser incident end, forming a focusless beam-expanding structure with the off-axis Reflective-C system, achieving laser beam expansion and beam divergence angle compression. The laser beam splitter structure allows the emitting and monitoring optical paths to share the same main optical system, and by adjusting the axial position of the emitting negative lens, it compensates for focal shifts in different bands and adjusts the beam divergence angle to adapt to laser ranging requirements for different target distances. This invention offers advantages such as unobstructed emission, multi-band compatibility, and adaptive beam divergence angle adjustment, improving long-distance laser transmission efficiency and ranging accuracy.

The present invention relates to a three-piece passive athermalized long-wave infrared optical system based on a refractive-diffractive hybrid lens, belonging to the field of optical design imaging structures in the infrared band; it includes a spherical cover, a first meniscus positive lens, a meniscus negative lens, and a second meniscus positive lens. Collimated light from infinity enters the first meniscus positive lens with the largest aperture, the meniscus negative lens, and the second meniscus positive lens in sequence through the spherical cover from the object plane, balancing the thermal difference, chromatic aberration, and monochromatic aberration of the system, and finally imaging on the detector focal plane. The first meniscus positive lens is a refractive-diffractive hybrid lens, and the side facing the image plane is an aspherical diffractive surface. By using the lens with the largest aperture in the optical system as a refractive-diffractive hybrid chalcogenide glass lens, the present invention maximally utilizes the low refractive index coefficient and good dispersion performance of chalcogenide glass, as well as the dispersion coefficient of the negative dispersion of the binary optical diffractive element and the large temperature compensation characteristic, solves the system focal shift caused by temperature change, better achieves the purpose of athermalization, and reaches the best imaging effect.

A hybrid lens assembly that corrects for chromatic aberrations and monochromatic aberrations in passing light. A plurality of refractive lens elements are provided that are fabricated from a common refractive material. The refractive lens elements are shaped and oriented to optically correct for monochromatic aberrations. A metalens is provided. The metalens optically corrects for the chromatic aberrations. The result is a hybrid lens assembly that contains both refractive lenses and a metalens. The result is an overall lens assembly that is apochromatic yet is smaller and easier to produce than assemblies that only use refractive lenses. The metalens also corrects for wavefront errors and focal shifts that result from using refractive lens of only one material type, therein making the use of only one refractive material practical in the manufacture of lens assemblies.

This invention discloses a deep in-situ 3D bioprinting system and method based on spherical standing wave focused ultrasound. It includes a spherical focusing system for generating spherical standing wave focused ultrasound, a motion control system for controlling the focal zone position of the focused ultrasound, and a data processing system for acquiring and analyzing ultrasonic cavitation signals to obtain control signals. The spherical standing wave focused ultrasound provided by this invention has superior focusing performance compared to traveling wave focused ultrasound, enabling spherical focused ultrasound 3D printing while balancing printing depth and accuracy, and exhibiting less focal shift in complex tissues. The sphere is formed by two hemispherical transducers of the same size and opposite positions, creating a spherical standing wave focusing cavity. The focused sound field is composed of sound waves directly radiated from the spherical surface and sound waves reflected multiple times by the spherical surface. When the sound waves directly focused at the center of the sphere and the sound waves reflected in each subsequent reflection are in phase, a very high sound pressure can be generated at the center of the sphere, and the focal zone accuracy is improved.