8 results about "Focal shift" patented technology

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 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 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.

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.

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.

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.