32results about How to "Large exit pupil diameter" patented technology

The invention provides a near-to-eye display optical system, relates to the field of optical engineering, and solves the problems of small field angle, small exit pupil diameter and cumbersome systemof the existing AR glasses. The near-to-eye display optical system comprises a display system and a spherical reflecting lens. The spherical reflecting lens is provided with two surfaces, the first surface is a partial reflecting surface, and the second surface is a transmission surface; the display system is placed in front of the pupil and located on the focal plane of the spherical reflecting lens, and the sphere centers of the display system and the spherical reflecting lens are both located within the range of 1 cm from the center of the pupil; the display system comprises linear array display pixels pasted on a transparent substrate, a substrate extension part on the outer edge of the transparent substrate, an outer frame, a driving system and an electronic control system. The driving system comprises a driven gear, a driving gear, a rotary bearing and a motor. A large field angle, a large exit pupil diameter and high resolution can be realized, and the glasses are light, easy tomanufacture, low in cost, easy to realize, stable in component fixation and structure and free of stray light interference.

The invention discloses an eyepiece and a head mounted display device. The eyepiece comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arrayed in parallel sequentially between an aperture slot and a display screen, wherein the second lens and third lens form a glued lens group, the other lenses are separately arranged. The first lens, third lens and the fourth lens are plus lenses, the second lens is a minus lens, the fifth lens is a plus lens, the sixth lens is a minus lens, or the fifth lens is a minus lens, the sixth lens is a plus lens. The eyepiece can acquire a big rear cut-off distance, and supports Myopia regulation in a wide range. Myopic people can see images clearly without wearing myopia lenses. At the same time, the eyepiece is compact in structure, has a big exit pupil diameter and a big exit pupil distance, permits certain level of wearing deviation, possesses a big viewing angle and small distortion, a high transfer function and a small color difference, and can guarantee the image clarity and color expressiveness.

The invention relates to a light low-light level night vision device optical system. The optical system comprises an eyepiece system, an image intensifier and an objective lens system, wherein the eyepiece system comprises a positive refractive power balsaming lens and a positive refractive power plastic non-spherical single lens which are successively arranged coaxially along a direction from eyes to a target optical axis; and the objective lens system comprises a first negative refractive power single lens, a second positive refractive power single lens, a third positive refractive power single lens, a fourth positive refractive power single lens, a fifth positive refractive power single lens, a sixth negative refractive power single lens, a diaphragm, a seventh positive refractive powerbalsaming lens and an eighth positive refractive power single lens which are coaxially and successively arranged along a direction from an optical axis to an object side. The light low-light level night vision device optical system has excellent properties of short length, light weight, small size, long distance of exit pupil, large diameter of exit pupil and high resolution ratio, and is particularly suitable for handheld or helmet type monocular and binocular low-light level night vision devices.

Provided are a near-eye display system, virtual-reality device, and augmented-reality device. A near-eye display system comprises a laser light source (261), a beam-splitting component (262), a scanning optical-fiber array (263), and a first concave reflector (264); the beam-splitting component (262) comprises a number M*N of output terminals; each output terminal is provided with an optical switch; the scanning optical-fiber array (263) comprises a number M*N of optical fibers; the M*N optical fibers are respectively connected to the M*N output terminals; M and N are positive integers greater than or equal to 2; when passing through the beam-splitting component (262), the laser light emitted by the laser light source (261) is split into M*N light beams; a light beam outputted from the output terminal corresponding to an optical switch in an activated state on the beam-splitting component (262) passes through the scanning optical-fiber array (263), and is then reflected into the human eye by the first concave reflector (264). The light beam outputted by each optical fiber is conical, therefore the width of the light beam increases continuously with an increase in the optical path; thus the exit-pupil diameter of the near-eye display system is increased and the strict limitations on the position of the eye during observation are reduced or avoided.

The invention discloses a visual optical system and a head-mounted display device. The visual optical system comprises a fifth lens, a fourth lens, a third lens, a second lens and a first lens which are sequentially arranged along a light incidence direction, and is characterized in that the first lens is a biconvex lens with positive focal power, the second lens is a meniscus-shaped lens with negative focal power, the third lens is a biconvex lens with positive focal power, the fourth lens is a biconvex lens with positive focal power, and the fifth lens is a meniscus-shaped lens with negative focal power. The advantages lie in that the visual optical system has the characteristics of light weight, compact structure, large exit pupil diameter and exit pupil distance, improvement in user experience, excellent imaging quality, high resolution and the like through controlling arrangement of concave-convex surfaces of the lenses, being complemented by other optical relation expressions to control related parameters and using glass and plastic lenses in a matched manner.

The invention provides an optical lens comprising at least four lenses; a diaphragm, a first lens, a second lens, a third lens and a fourth lens are orderly arranged along an optical axis direction from a human eye observation side to a light source device side in the optical lens; the first lens is f1 in focal length, and the second lens is f2 in focal length; the second lens, the third lens andthe fourth lens are f24 in combined focal length; a total focal length of the optical lens is fw which satisfies the following relationship: (1) 0.66 <f1 / fw<3.3, (2) |f2 / fw|<4, (3) 0.5<f24 / fw<2.5. Viaadoption of the optical lens described in the invention, a view field can be enlarged, an exit pupil diameter can be increased, and visual effects can be improved.

An ultra-thin infrared collimator based on a fly-eye lens belongs to the technical field of infrared optics. The fly eye lens assembly, target lens assembly and light source system are installed in the cabinet in sequence from front to back. The front end of the cabinet is fixed with a front cover, the middle of the front cover is provided with an infrared output window, and the rear of the cabinet is fixed with a rear cover. plate; the fly-eye lens of the fly-eye lens assembly is composed of several small lens units in the form of a rectangular array, and the target image array is engraved on the target lens in the target lens assembly, and the target image array surface is located on the focal plane of 1 times the focal length of the fly-eye lens array surface On the surface of the target image array, several target images 'F' are in one-to-one correspondence with the image planes of several small lens units on the fly-eye lens array, and the targets are consistent. The focal points of several small lens units in the fly-eye lens array Coincides with the center of several target images 'F' in the target lens image array. The invention is used for detection and identification of infrared optical targets.

The invention discloses an optical system applicable to virtual reality equipment. The optical system applicable to the virtual reality equipment comprises a diaphragm, a positive focal power lens, anegative focal power lens and an image displayer in sequence in the optical axis direction; the positive focal power lens is used for inhibiting ray divergence angles which are incident from a big field angle, and the negative focal power lens is used for balancing astigmatism and distortion generated by the positive focal power lens. The two lenses are both made from a plastic material, the positive focal power lens is a low-refractive-index and high-dispersion-coefficient lens, the negative focal power lens is a high-refractive-index and low-dispersion-coefficient lens, and the combination of the two lenses can reduce chromatic aberration of the optical system. The optical system applicable to the virtual reality equipment is large in field angle, a single-eye diagonal field angle can reach 100 degrees, and thus good immersion sense is provided for the virtual reality equipment; good image quality and distortion are also obtained at an edge field lens set, and meanwhile, the lens sethas a large exit pupil distance and exit pupil aperture, which can provide more comfortable wearing experience for observers.

A waveguide display system and method are provided. The system includes: an image source, used to generate an imaging beam; a relay collimation system, used to collimate the imaging beam into a first parallel light at the same angle; a coupler, used to collimate the first parallel light Coupled into the following waveguide to form the second parallel light; the waveguide is used to propagate the second parallel light to the following coupler in the form of total reflection; the coupler is used to diffract the second parallel light into converging the light, leaving the waveguide, and entering the following first polarization grating; the first polarization grating is used to divide the converged light into two beams of circularly polarized light with opposite rotation directions emerging at different angles; and the second polarization Two beams of circularly polarized light with opposite rotation directions are diffracted by the second polarization grating to produce two beams of laterally misaligned imaging beams and enter the eye. The system has a simple structure, and while realizing the retinal display, the diameter of the exit pupil is enlarged, and the external real scene can be viewed.

The invention relates to a two-piece free-form surface head mounted display optical system, and belongs to the field of optical system designs. The system comprises a microdisplay, a free-from surface prism with three optical surfaces and a free-form surface lens with two optical surfaces. Two of the three optical surfaces of the free-form surface prism in the two-piece free-form surface head mounted display optical system of the invention are free-form surfaces; the top surface of the prism, namely the third surface of the prism is a plane; and in a processing process, the top surface can serve as a base surface so as to reduce the difficulty in positioning the free-form surface and reduce processing cost. In the system, a free-form surface lens is added; the two optical surfaces of the free-form surface lens are respectively a free-form surface and a plane, so the processing difficulty is low; moreover, the surface shape parameters, the thickness, the eccentricity and a dip angle ofthe free-form surface lens can serve as optimization variables; and more optimization variables are more contributive to correcting a system aberration, so that a greater exit pupil diameter can be realized.

The invention provides an exit pupil-expanding compact type nano-structure waveguide display method and an exit pupil-expanding compact type nano-structure waveguide display system. The method comprises the following steps: a microdisplay clings to one side of the waveguide to emit scattered beams, and the scattered beams enter the waveguide and are irradiated on an incident coupling diffraction component arranged on one side of the waveguide and clings to the inclined surface of the waveguide; the incident coupling diffraction component modulates the scattered beams to generate parallel beamsto be propagated in the waveguide in a total reflection mode; and when the parallel beams in the light waveguide are transmitted to an emergent coupling diffraction component arranged on the other side, the emergent coupling diffraction component modulates the parallel beams to generate parallel output light to depart from the waveguide. According to the method provided by the invention, a collimating device between the microdisplay and the waveguide is removed, so the structure required by waveguide display is simplified; meanwhile, one incline surface is arranged at one end of the waveguideand the incident coupling diffraction component is arranged on the inclined surface, so that the diffraction efficiency and the field angle of the display system are improved and the exit pupil diameter is enlarged.