6 results about "Off-axis optical system" patented technology

The invention provides an optical system and a display device. The optical system comprises a lens structure, a transflective film and a reflective polarizing film, the transflective film and the reflective polarizing film are arranged on the lens structure, image light transmitted by the transflective film is configured to be folded back between the transflective film and the reflective polarizing film and is emitted from the reflective polarizing film, and the lens structure comprises at least one lens. The optical system further comprises a calibration lens located on the side, away from the reflective polarizing film, of the transflective film, and the optical axis of the lens structure does not pass through the calibration lens. The focal length of one of the lens structure and the calibration lens is a positive value, the focal length of the other one is a negative value, and the calibration lens comprises at least one free-form surface, so that the degree of freedom of optical system design is improved, non-centrality caused by the lens structure is effectively corrected, aberration generated by an off-axis optical system is corrected, and the imaging quality is improved; the camera calibration process is simplified, and the sight tracking and iris recognition precision is improved.

A wedged window for a multi-mode system includes an outer curved surface and an inner curved surface. The inner curved surface is tilted at a specified angle with respect to the outer curved surface. The outer curved surface is configured to receive a signal wavefront for a multi-mode optical device that includes the multi-mode system and an off-axis optical system. The inner curved surface is configured to direct a refracted wavefront based on the signal wavefront toward the off-axis optical system.

The application discloses a design method of an off-axis image quality optimized ultrathin diffractive lens, relates to the technical field of optical device design, and comprises the following steps: constructing an initial ultrathin diffractive lens phase model in a non-rotationally symmetric phase surface shape description mode, generating a system wavefront error data set and carrying out field partition weighting processing, inputting the weighted data set into an optimization evaluation function with a main light ray incidence angle sensitive aberration constraint term, coupling a global search operator for iteration and dynamically adjusting polynomial coefficients, extracting phase surface shape coefficients after iteration convergence, calculating manufacturable step depth distribution data, and outputting a nanoimprint master layout or etching depth table. The scheme can adapt to the asymmetric incidence characteristics of an off-axis optical system, accurately constrain off-axis aberration distortion, and directly connect with the ultrathin diffractive lens manufacturing chain.

This application discloses an off-axis optical system and a LiDAR. The off-axis optical system includes a transmitting module, a receiving module, and a deflecting element. The transmitting module and the receiving module are arranged along a first direction perpendicular to the optical axis of the receiving module. The deflecting element is positioned on a light-incident side of the receiving module, with a gap existing along the first direction between the deflecting element and the optical axis of the receiving module. At least part of echo beams, which are formed by reflection of scanning beams emitted from the transmitting module off a target, are refracted by the deflecting element before reaching the receiving module.

The application discloses a holographic optical element, a manufacturing method and a near-eye display system, wherein the holographic optical element comprises a light-transmitting substrate and a holographic grating, the holographic grating is prepared by a holographic photosensitive film layer arranged on the surface of the light-transmitting substrate, the holographic grating has Bragg gratings corresponding to three imaging wavelengths in the same area, the holographic grating is exposed by coherent light of three exposure wavelengths in sequence, the holographic grating is a free wave surface control holographic element prepared by a free light wave surface, and the included angle between incident light and diffracted light of the holographic grating ranges from 5 degrees to 45 degrees. The holographic optical element is a color volume holographic grating, is prepared by multiplexed exposure of holographic optical elements of red, green and blue channels on the same layer of holographic photosensitive film, can realize diffraction of light of three wavelengths, can be used as an optical combiner in augmented reality application, realizes color display, and can correct off-axis aberration in an off-axis optical system.

The embodiment of the invention discloses an off-axis optical system and a laser radar. The off-axis optical system comprises a transmitting module, a receiving module and a deflection element, the transmitting module and the receiving module are arranged in the first direction, and the first direction is perpendicular to the optical axis of the receiving module; the deflection element is located on the light incident side of the receiving module, a gap in the first direction is formed between the deflection element and the optical axis of the receiving module, at least part of the echo light beam reaches the receiving module after being refracted by the deflection element, and the echo light beam is formed by reflecting a scanning light beam emitted by the emitting module through a target object. The deflection element is additionally arranged on the light incident side of the receiving module, so that the problem of image space deviation of a close-range target object can be effectively solved.