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

The invention belongs to the field of optical systems, and particularly relates to an entrance pupil front refrigeration type free-form surface off-axis four-mirror optical system. The optical system comprises a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror, a detector window and a detector cold diaphragm which are sequentially arranged from an object plane to a focal plane, wherein the first reflecting mirror is arranged at a position close to the object plane; the second reflecting mirror is arranged on a reflecting light path of the first reflecting mirror; the third reflecting mirror is arranged on a reflecting light path of the second reflecting mirror; the fourth reflecting mirror is arranged on a reflecting light path of the third reflecting mirror; and a detector window and a detector cold diaphragm are sequentially arranged on a reflection light path of the fourth reflector. According to the invention, the modular design of the reflective off-axis optical system can be realized, and the integration level and interchangeability of the photoelectric system are improved; and the relative aperture is larger, so that the detection sensitivity of the optical system is further improved while the optical path structure is kept compact.

The invention provides an assembly system and an assembly method of an off-axis optical system, which are used for solving the technical problems that all optical elements of the existing off-axis optical system do not have a common optical axis, the assembly difficulty is high, and the high-precision assembly and adjustment of the off-axis optical system cannot be met by a traditional assembly and adjustment process method. The system comprises a three-coordinate measuring machine, a laser interferometer, a compensating mirror and an optical imaging camera. The device further comprises an auto-collimation theodolite, a target ball, an adjusting support and a five-dimensional adjusting table. And installing and adjusting the third reflector to obtain the position of the first target ball. The theoretical position of a second target ball is calculated according to the position of the first target ball, a main reflector is installed and adjusted, a compensation detection light path of the main reflector is set up, the focus position of the laser interferometer is obtained, finally, the focus position coincides with the theoretical position of the second target ball, and assembling of the off-axis type optical system is completed.

The invention discloses a view field consistency detection system and method for an optical structure, and the system comprises a collimator, an adjusting support, and a data synchronization control collection device, the collimator is used for transmitting parallel light beams to a to-be-detected device, the adjusting support is used for bearing the to-be-detected device and is assembled to drive the to-be-detected device to rotate and translate, and the data synchronization control collection device is used for collecting the to-be-detected device. The angle and the position of the optical axis of the to-be-measured equipment are changed, so that the incident channel and the incident angle of the parallel light beams are changed; the data synchronous control acquisition device is used for acquiring two-dimensional view field measuring point data of each channel of the to-be-detected equipment under parallel light beams incident at different angles and performing view field consistency detection between the channels of the to-be-detected equipment according to the two-dimensional view field measuring point data of each channel. According to the method, the consistency is judged more accurately according to the area coincidence degree of the view fields between the channels in the two-dimensional angle space, and the method can be applied to an off-axis optical system and has high adaptability to an instrument adopting an unconventional optical structure.

The application provides an assembling and adjusting method and assembling and adjusting tool of an off-axis optical system, and belongs to the technical field of optical engineering. The method is characterized in that: a computer holographic element is designed and processed, the surface type position of a primary mirror is detected and determined by using the computer holographic element, the frame position of the off-axis optical system is determined by using a laser tracker and a standard sphere, and a secondary mirror is adjusted by designing and using an off-axis mirror adjusting tool, so that the full field wave front of the off-axis optical system meets the requirements.

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 belongs to the field of optical systems, and particularly relates to a pre-in-pupil refrigeration type free-form off-axis four-mirror optical system. The optical system comprises, from an object plane to a focal plane, a first mirror, a second mirror, a third mirror, a fourth mirror, a detector window and a detector cold shield which are sequentially arranged. The first mirror is arranged near the object plane. The second mirror is arranged on the reflected light path of the first mirror. The third mirror is arranged on the reflected light path of the second mirror. The fourth mirror is arranged on the reflected light path of the third mirror. The detector window and the detector cold shield are sequentially arranged on the reflected light path of the fourth mirror. The application can realize modular design of the reflective off-axis optical system, improve the integration and interchangeability of the photoelectric system, and has a larger relative aperture, thereby further improving the detection sensitivity of the optical system while keeping the optical path structure compact.

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.

The embodiment of the invention provides telescopic equipment, an optical module and a communication terminal, relates to the technical field of optics, and is used for reducing the installation and adjustment difficulty of the telescopic equipment. The telescopic device comprises a first reflecting mirror with a first reflecting surface and a second reflecting mirror with a second reflecting surface. And the first reflecting mirror and the second reflecting mirror form an off-axis optical system. Wherein light enters the first reflecting surface, is transmitted to the second reflecting surface after being reflected by the first reflecting surface, and is emitted after being reflected by the second reflecting surface; the light comprises a first beam and a second beam; the distance between the position where the first light beam enters the first reflecting surface and the geometric center of the first reflecting surface is larger than the distance between the position where the second light beam enters the first reflecting surface and the geometric center of the first reflecting surface. The distance between the position where the first light beam enters the second reflecting surface and the geometric center of the second reflecting surface is larger than the distance between the position where the second light beam enters the second reflecting surface and the geometric center of the second reflecting surface.

A multi-optical-view-field photoelectric system for high-precision navigation is composed of a plurality of optical view fields in different vector directions, a highly integrated design is adopted, a CCD / CMOS is shared to achieve control over a plurality of head vector directions, a plurality of off-axis optical systems sharing the same optical axis are integrated together, and the multi-optical-view-field photoelectric system is formed. And finally, optical information in multiple vector directions of the object space is converged on the same optical focal plane through the same rear light path optical system, and the imaging sky area range is expanded by adopting a plurality of heads with different direction vectors, so that high-precision unification of time dimensions is realized.