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

The invention relates to an off-axis parabolic mirror key parameter calibration system and method. The system comprises a first optical path, a second optical path, a third optical path, a fourth optical path and a fifth optical path. The first optical path comprises a laser interferometer, a plane mirror, a reference cross target and an off-axis parabolic mirror. A convergence beam focus sent by the laser interferometer and the focus of the off-axis parabolic mirror completely overlap. A beam emitted by the laser interferometer is reflected by the off-axis parabolic mirror, perpendicularly comes into the plane mirror, and returns along the original way. The reference cross target is placed at the intersection of the convergence beam focus of the laser interferometer and the original optical axis of the off-axis parabolic mirror. The reference cross target and the laser interferometer are in cat eye. The technical problem of low key parameter measurement accuracy of the off-axis parabolic mirror is solved. According to the invention, all processes use optical non-contact direct measurement; the accuracy is high; a mirror is prevented from being scratched; and an accurate basis is provided for later precise adjustment of an off-axis optical system.

A method for designing off-axial optical system with freeform surfaces is provided. An initial system is established. A freeform surface of the off-axial optical system that needs to be solved is defined as a freeform surface. A number of feature rays are selected. A number of intersections of the feature rays with the freeform surface are calculated point by point based on a given object-image relationship and a vector form of Snell's law. A number of first feature data points are obtained from the intersections and surface fitted to obtain the freeform surface. All the freeform surfaces of the off-axial optical system that need to be solved are obtained by the method above to form a before-iteration off-axial optical system. The before-iteration off-axial optical system is used as the initial system for multiple iterations to obtain an after-iteration off-axial optical system.

The invention relates to a focus inspection method of abaxial reflective optical lens, which belongs to an inspection method in the technical field of optical inspection. The technical problem needed to be solved aims at providing the focus inspection method of abaxial reflective optical lens. The invention has the technical proposal that: firstly, an abaxial reflective optical lens measuring system is built; secondly, the measuring device is debugged; thirdly, the measuring is acted, a theodolite is rotated to respectively aim at the divided images of A and B with an angle difference of 2 omega; and fourthly, data processing is acted: the focus of the measured lens is obtained through the formulae of f=(y / tg omega)*cos alpha. The invention solves the measurement on focus of abaxial reflective optical lens. The invention is also suitable to be used for inspection on other abaxial optical systems.

The invention provides an MTF test apparatus and method for a small off-axis optical system. The apparatus is mainly composed of a collimator, an MTF detection system, a planar reflector and a two-dimensional rotating mechanism, wherein the two-dimensional rotating mechanism is in rigid connection with the plane reflector, the collimator and the MTF detection system are located at the same optical axis, and the plane reflector is located between the collimator and the MTF detection system. With the MTF test apparatus and method for the small off-axis optical system of the invention adopted, a test adjustment mechanism is simplified greatly, and is convenient to operate; and the plane reflector and an optical system to be tested form a test module, and therefore, a series of optical performance modular tests can be carried out, and operation procedures can be simplified, and test efficiency can be improved.

An image-formation optical system is disclosed which is an off-axial optical system configured using reflective surfaces, with which the performance deterioration with respect to manufacturing discrepancies is reduced, and which can be made sufficiently compact. The image-formation optical system comprises a reflective optical unit including a plurality of reflective surfaces. Each of the reflective surfaces has a curvature and a rotationally asymmetric shape. Moreover, L / {Er(S−1)} is smaller than 2.2 and L / {Eo (S−1)} is larger than 3.

The invention discloses a holographic waveguide displaying device which comprises the components of a multi-angle calibrating micro display device, a lens set, a planar waveguide, an in-coupling holographic optical diffraction element and an out-coupling holographic optical diffraction element. The in-coupling holographic optical diffraction element and the out-coupling holographic optical diffraction element form a telescope optical system. The picture of the micro display device is arranged at a certain position to human eyes and is projected to an upright amplified virtual image, thereby realizing a large visual field effect. Furthermore, through a holographic waveguide structure, the optical path of the traditional coaxial telescope optical system can be turned for entering the human eyes, thereby forming an off-axis optical system which can be used for a penetrating type headworn displaying. The holographic waveguide displaying device is based on a traditional telescope optical system principle; and through the holographic waveguide structure, a coaxial telescope system is turned to the off-axis optical system which is suitable for the penetrating type headworn displaying, thereby settling problems of small visual field and small exit pupil in a traditional holographic waveguide display device. The holographic waveguide displaying device has advantages of simple and compact optical structure, easy operation in preparing and processing, low cost, small weight, etc.

The invention provides a system and method for adjusting the common optical axis of an off-axis optical system. The system comprises an interferometer, a compensator optical system, a cross reticle assembly and a planar mirror, wherein the cross reticle assembly sleeves the end portion of the compensator optical system, and the interferometer, the cross reticle assembly, the compensator optical system and the planar mirror are successively arranged at the same optical path. The system and method provided by the invention enable the optical axis of an off-axis reflector to be visible, and provides convenience for adjustment of the common optical axis of the whole off-axis optical system.

The invention discloses a large-aperture off-axis optical system and a passive athermal method. The large-aperture off-axis optical system comprises a displacement compensation mechanism, a secondary mirror chamber with a secondary mirror, a connection framework, a primary mirror framework and a primary mirror chamber with a primary mirror. The displacement compensation mechanism is fixedly connected with the bottom of the secondary mirror chamber, the primary mirror framework is fixedly connected with the primary mirror chamber, and the primary mirror framework is connected with the secondary mirror chamber through the connection framework. According to the large-aperture off-axis optical system, the displacement compensation mechanism is arranged and can completely compensate a system interval caused by temperature, it is effectively guaranteed that image quality of the system does not change with temperature, the system is easy to install, and the size, the weight and cost are not increased on the basis of an original system.

The invention is directed to a coaxially arranged, off-axis optical system for a sighting device or aiming device. It is the object of the invention to provide a possibility for constructing an optical system in such a way that the typical disadvantage with respect to the tightness of a sighting device in an open-type construction is overcome and a good flattening of the image field is achieved in addition to the high optical imaging quality of the aiming mark. According to the invention, by means of a coaxially arranged, off-axis optical system for a sighting device or aiming device comprising a lens group, wherein the lens facing the target object is constructed as a converging meniscus and the lens facing the eye is constructed as a diverging meniscus, with a dichroic reflector and an embodiment for the aiming mark, the above-stated object is met in that a correction lens with positive refractive power is arranged at a distance of less than 0.2-times the focal length relative to the aiming mark and acts exclusively in the beam path of the aiming mark, and in that the correction lens is inserted into the housing by positive locking and is sealed so that the housing with the aiming mark, with the associated mechanism and with the electronics in the interior is sealed relative to the environment.

In a multi-eye camera head unit (10), a panoramic image sensing exchangeable camera head unit (111) and three-dimensional image sensing exchangeable camera head unit (112) are exchanged in correspondence with the image sensing mode. The panoramic image sensing exchangeable camera head unit (111) includes a pair of optical elements (111R, 111L), which comprise offaxial optical systems each having a plurality of reflecting and refracting surfaces. The three-dimensional image sensing camera head unit (112) includes a pair of optical elements (112R, 112L), which comprise offaxial optical systems each having a plurality of reflecting and refracting surfaces.

A high-precision installation and adjustment method for a total-reflection off-axis collimating optical system comprises firstly establishing an optical reference plane by using an auto-collimation detection optical path; secondly, detecting a primary mirror independently by using an Offner detection optical path; thirdly, installing and adjusting a secondary mirror by using an intermediate imageplane in combination with primary mirror detection; fourthly, performing joint adjustment by using a third mirror and the secondary mirror, and measuring the parallelism of the emitted light by usinga pentagonal prism method; and finally, installing a folded-in plane mirror and a roll-out plane mirror in the optical system. The method solves the problem that because of the eccentricity and tilt of the total-reflection off-axis optical system, it is very difficult in spatial positioning, angle control and spatial reference establishment of a reflector, and the installation and adjustment process has to be repeatedly iterated.

A luminous flux optically modulated by an image display device is projected to be magnified on a screen by a projection optical system includes: a first optical system having a positive first lens group including eight lenses, a negative second lens group including three lenses, and a third lens group including an aspheric single lens; and a second optical system including an aspheric reflecting mirror. The projection optical system is an off-axial optical system, and forms the intermediate image between the first optical system and the second optical system. Moreover, the expressions T1 / Y<12.5 and T12 / f1<6.0 are satisfied where T1 is the overall length of the first optical system, Y is the maximum light ray height on an image display device, T12 is the distance between the first optical system and the second optical system, and f1 is the focal length of the first optical system.

A luminous flux optically modulated by an image display device is projected to be magnified on a screen by a projection optical system includes: a first optical system having a positive first lens group including eight lenses, a negative second lens group including three lenses, and a third lens group including an aspheric single lens; and a second optical system including an aspheric reflecting mirror. The projection optical system is an off-axial optical system, and forms the intermediate image between the first optical system and the second optical system. Moreover, the expressions T1 / Y<12.5 and T12 / f1<6.0 are satisfied where T1 is the overall length of the first optical system, Y is the maximum light ray height on an image display device, T12 is the distance between the first optical system and the second optical system, and f1 is the focal length of the first optical system.

The invention provides an off-axis alignment system, which is used for lithographic equipment to ensure the position relationship of a silicon chip and a worktable. The off-axis alignment system comprises a laser interferometer, a zero position sensor, an off-axis optic system and a worktable; wherein, the laser interferometer is arranged along X direction and Y direction, and the laser interferometer is used for measuring the position of an off-axis optical axis and the worktable; the zero position sensor is arranged at the edge of the maximal motion range of the worktable and used for providing the initialization signal of the laser interferometer; the side of the off-axis optic system is provided with two off-axis reflecting surfaces respectively vertical to the X direction and the Y direction; and the side of the worktable is provided with two reflecting surfaces respectively vertical to the X direction and the Y direction, and the off-axis reflecting surfaces and the worktable reflecting surfaces are used for reflecting the measuring beams sent by the laser interferometer. The laser interferometer is added in the off-axis alignment system, so that the excursion of the off-axis plain shaft in the alignment system can be detected in real time and the alignment precision of the silicon chip can be ensured.

The invention is directed to a coaxially arranged, off-axis optical system for a sighting device or aiming device. It is the object of the invention to provide a possibility for constructing an optical system in such a way that the typical disadvantage with respect to the tightness of a sighting device in an open-type construction is overcome and a good flattening of the image field is achieved in addition to the high optical imaging quality of the aiming mark. According to the invention, by means of a coaxially arranged, off-axis optical system for a sighting device or aiming device comprising a lens group, wherein the lens facing the target object is constructed as a converging meniscus and the lens facing the eye is constructed as a diverging meniscus, with a dichroic reflector and an embodiment for the aiming mark, the above-stated object is met in that a correction lens with positive refractive power is arranged at a distance of less than 0.2-times the focal length relative to the aiming mark and acts exclusively in the beam path of the aiming mark, and in that the correction lens is inserted into the housing by positive locking and is sealed so that the housing with the aiming mark, with the associated mechanism and with the electronics in the interior is sealed relative to the environment.

The invention discloses an adjustment method based on a second-order sensitivity matrix method. The method comprises the steps of: building an off-axis reflection telescope model through Zemax, and obtaining a Zernike coefficient corresponding to a system through changing the spatial positions of other reflectors except a main mirror; obtaining multiple groups of misalignment errors and corresponding Zernike coefficients by repeating the above step, and then obtaining a curve relation function of the misalignment errors and the Zernike coefficients according to the principle of a least squaremethod; and solving a second-order derivative about the offset by using the obtained curve function so as to obtain a second-order sensitivity matrix, and finally guiding the assembling and adjustmentof an off-axis optical system by using the second-order sensitivity matrix. The method is suitable for a large error range, has higher precision than a traditional sensitivity matrix, can be better used for actual adjustment engineering, and improves the final imaging quality of the optical system.

The invention discloses an optical system packaging structure for a helmet-mounted display. The optical system packaging structure for the helmet-mounted display comprises one image source, five lenses and a package casing, wherein the package casing is formed by processing hard aluminum alloy, two of lenses are processed to be square, three of lenses are processed to be round, and a package casing structure of the lenses are formed by splicing three casing sections which respectively packages the square lenses, the round lenses and the image source. The position accuracy of the lenses and the image source are guaranteed through structural characteristics of the package casing, the assembling accuracy of parts of three casing sections are guaranteed through machining accuracy of the casing parts, the position of the casing packing the image source can be slightly adjusted through an adjusting gasket, and accordingly the position of the image source is slightly adjusted. By means of the structure, the optical system packaging structure for the helmet-mounted display enables lenses and the light source of an off-axis optical system to be reliably fixed, is high in lens position accuracy and improves the display quality, and the position of the image source is adjustable slightly.

The invention discloses a high-efficiency visible-infrared common-caliber off-axis optical system. A diaphragm of a visible light channel off-axis three-mirror optical system of the optical system isarranged on a primary mirror, a diaphragm of an infrared channel refrigeration type off-axis optical system of the optical system is arranged on a cold diaphragm, and the cold diaphragm is also an exit pupil of the system. The optical system is an off-axis two-reflection main optical system shared by visible light and infrared light, infinite light of an object side enters a primary mirror, reaches a secondary mirror through the primary mirror, reaches a color separation film after being reflected by the secondary mirror, reaches a third visible mirror after being reflected by the third visible mirror, reaches a visible turning reflector after being reflected by the third visible mirror, and reaches a visible light detector after passing through the visible turning reflector; infinite light of the object space enters the primary mirror, reaches the secondary mirror through the primary mirror, reaches the color separation film after being reflected by the secondary mirror, reaches the third infrared mirror after being transmitted by the color separation film, reaches the fourth infrared mirror after being reflected by the third infrared mirror, reaches the relay optical system afterbeing reflected by the infrared turning reflector, reaches the infrared window after being refracted by the relay optical system, is transmitted by the infrared window, and reaches the diaphragm andreaches the infrared detector after passing through the diaphragm.

The invention discloses an integrated modeling method for an initial structure of a multi-reflector off-axis optical system. The method comprises the steps of: firstly, establishing a space rectangular coordinate system, and establishing a uniform surface expression of a coaxial structure for each reflector based on a paraxial optical theory; secondly, acquiring a mirror surface uniform expression of an off-axis structure after rotation and displacement by combining a rotation matrix and a displacement matrix; thirdly, constructing an inter-mirror relation expression with an arbitrary mirror as the benchmark; and finally carrying out modeling on an imaging light path of an off-axis reflection system, establishing a target function with the height difference of an intersection point of emergent light and an image plane as a constraint, and acquiring surface shape coefficients of k surface reflectors. According to the integrated modeling method, complex free-form surface modeling is ingeniously simplified into quadratic curve modeling capable of integrally expressing the pose and the relative position relation in combination with the conversion matrix, establishment of an integrated model of the reflector surface shape of any spatial pose is achieved, and the method is suitable for design of an off-axis system of any multi-face reflector.

The invention provides a double-field-of-view stereoimaging optical system based on an integrated shared primary mirror, which consists of a two three-reflector abaxial optical systems and comprises a welding primary mirror, two secondary mirrors, three third mirrors, two plane deflection mirrors and two receiving surfaces. Through using two beams of symmetrical deviated field-of-view incident light rays, stereopairs are formed through the optical systems, and the invention can be used for realizing the spatial stereometric mapping with large base-height ratio and high precision. The system of the invention welds the two main mirrors of the two optical systems at a certain angle for realizing the integration of the optical systems, and the stability of the included angle between the front field of view and the back field of view is ensured, so the stability of the base-height (B / H) ratio is ensured, in addition, the welding angle can be changed, and the required base-height (B / H) ratio can be flexibly realized. The system of the invention has the advantages of light weight, small size and high thermal stability, so the high stability of inner orientation elements can be obtained, and the high-precision correction on the images is realized.

The invention discloses an adjusting method and device for an off-axis reflecting type optical system. Simple and rapid adjustment of an optical path of the off-axis reflecting type optical system canbe achieved through an interval adjusting device composed of four plane reflectors. For a telescope system composed of two off-axis parabolic mirrors, the device is mainly composed of a light source,a diaphragm, a primary mirror, an interval adjusting device, a secondary mirror, an exit pupil, a shear plate and an observation surface. One simple implementation mode of the interval adjusting device is that the interval adjusting device comprises four plane mirrors, a support and a guide rail, a first plane mirror is parallel to a second plane mirror, and a third plane mirror is parallel to afourth plane mirror. The four plane mirrors are installed on the guide rail through the support and can move. The adjusting device used in the invention is simple in structure and convenient to adjust, can solve the problem that the optical path of the off-axis reflecting type optical system is complex and difficult to adjust, and is expected to be applied to various off-axis optical systems needing to be adjusted.

An image reader adopting an off-axial optical system, an adjustable imaging mirror and a CCD fixed to a highly rigid structure. Since the relative position between reflecting and imaging mirrors can be set highly accurately, adjusting only the CCD-mounting position allows a required specification of the read image to be met. The imaging mirror can easily be adjusted without distorting the reflecting surface. The reflecting and imaging mirrors, and the CCD-mounting-position adjuster are positioned directly to reflecting-mirror supporting sections, imaging-mirror supporting sections, and CCD supporting sections, which are integrated with a carriage casing, and fixed to them. The CCD is fixed to the carriage casing with the CCD-mounting-position adjuster. An imaging mirror close to a diaphragm and adjacent to the image is supported by a mirror adjusting plate, which can be displaced to adjust the position of the imaging mirror.

The invention provides a multi-mirror integrated large-view-field long-focal-distance axis four-mirror optical system, and belongs to the technical field of space optics. The problem that an existing off-axis optical system is large in size and high in assembling and adjusting difficulty is solved. The optical system comprises a primary reflector, a secondary reflector, a third reflector and a fourth reflector. The main reflecting mirror and the third reflecting mirror form an integrated mirror A, and the secondary reflecting mirror and the fourth reflecting mirror form an integrated mirror B; light emitted by the light source is sequentially reflected by the primary reflector, the secondary reflector, the third reflector and the fourth reflector and then converged on the focal plane. The system has the advantages of being compact and easy to install and adjust, and the machining cost and the launching cost can be greatly reduced; the optical system can meet the requirements of imaging from visible light to infrared band and multispectral detection.

The invention discloses a polarization aberration analysis method for an off-axis free-form surface optical system, belongs to the technical field of optical system polarization characteristic analysis, and aims to solve the problem that the existing polarization aberration analysis method cannot comprehensively evaluate a non-axisymmetric system containing a free-form surface.The method comprises the following steps: establishing a free-form surface polarized light tracing model; obtaining the phase aberration of the system through Follicle decomposition; obtaining two-way attenuation of the system through singular value decomposition; obtaining phase delay of the system through singular value decomposition; adding a free-form surface; repeating the steps 1 to 4 to obtain the phase aberration, two-way attenuation and the phase delay of the off-axis free-form surface optical system, and making the difference between the phase aberration and the phase aberration of the off-axis system without free-form surface to obtain the influence of the free-form surface on the polarization aberration of the off-axis optical system; adjusting the Zernike coefficient representing the free-form surface to obtain the influence of the free-form surface on the overall polarization characteristic distribution of the system; and fusing scalar aberration into vector aberration for overall analysis, and facilitating system optimization.

The invention provides a non-refrigeration photoelectric detector relative spectrum response temperature characteristic calibration method. The monochromatic light is collected in a vacuum temperaturecontrol system by an off-axis optical system at the output of a monochromator and is received by a standard detector in the vacuum temperature control system. An output signal of the detector is amplified and then sent to a data acquisition system, and change of the output wavelength of the monochromator is controlled by the controller. During measurement, the standard detector is firstly calibrated in the vacuum temperature control system, then the standard detector is removed through a precise displacement turning table, a measured detector is turned to the same position, after the vacuum system reaches the set state, a thermostat is set to be in different temperatures, after temperature stabilization, non-refrigeration photoelectric detector relative spectrum response measurement underdifferent temperatures is carried out. The method is advantaged in that not only can the monochromatic light be prevented from irradiating onto the detected infrared detector, but also interference because of frosting and steam generation on the surface of a non-refrigeration photoelectric detector caused by increase or decrease of the surrounding temperature can be avoided.

The invention discloses a high definition head mounted display for 3D (three-dimensional) panoramas. The high definition head mounted display for the 3D panoramas comprises a mounting frame and the like, wherein a left optical-mechanical structure and a right optical-mechanical structure are fixed on the mounting frame, the left optical-mechanical structure and the right optical-mechanical structure are fixedly connected through a connecting beam, a left lens group is fixed at the bottom of the left optical-mechanical structure, a left adjusting knob is connected with the upper surface of the left optical-mechanical structure, a right lens group is fixed at the bottom of the right optical-mechanical structure, and a right adjusting knob is connected with the upper surface of the right optical-mechanical structure. The invention provides the head mounted display which achieves accurate positioning and debugging in mounting of lenses of an off-axis optical system. An image source and a reflector of the high definition head mounted display for the 3D panoramas can be rotated to be adjusted, and then 3D imaging effects can be observed in real time. Furthermore, the lenses and the image source of the high definition head mounted display are fixed and reliable, mounting accuracy of positions of the lenses is high, a user feels comfortable when the user wears the high definition head mounted display, and the high definition head mounted display is convenient to use, light and handy in structure, and high in practicability.

The present invention is an off-axis aspheric goggle optical system. The present invention adopts off-axis eccentric placement of liquid crystal (Liquid Crystal Display, LCD) image surface, off-axis eccentric lens and wedge lens to correct off-axis aberration, and adopts Design method of off-axis aspheric goggles optical system with quadric goggles and relay lens coupled. Compared with the prior art, the present invention has advantages, characteristics or positive effects: 1. The circular field of view of the off-axis optical system is 25 degrees, and the exit pupil is 10mm, which has the characteristics of large field of view and large exit pupil; 2. The energy attenuation of the optical system is small, and the output energy is 4 times that of the general coaxial optical system; 3. The imaging quality of the optical system is high, the center field of view, the MTF value at 50lp / mm is not less than 0.5, and the edge field of view is 50lp / mm The MTF value is not less than 0.5; 4. The weight of the optical system is light, less than 40g; 5. The length of the optical system is shorter, which is more suitable for arrangement on the helmet.

A method for designing off-axial optical system with freeform surfaces is provided. An initial system is established. A freeform surface of the off-axial optical system that needs to be solved is defined as a freeform surface. A number of feature rays are selected. A number of intersections of the feature rays with the freeform surface are calculated point by point based on a given object-image relationship and a vector form of Snell's law. A number of first feature data points are obtained from the intersections and surface fitted to obtain the freeform surface. All the freeform surfaces of the off-axial optical system that need to be solved are obtained by the method above to form a before-iteration off-axial optical system. The before-iteration off-axial optical system is used as the initial system for multiple iterations to obtain an after-iteration off-axial optical system.

The invention discloses a large-diameter off-axis optical system and a passive adiabatic method, comprising: a displacement compensation mechanism, a secondary mirror chamber equipped with a secondary mirror, a connecting frame, a primary mirror frame, and a primary mirror mounted with a primary mirror chamber; the displacement compensation mechanism is fixedly connected to the bottom of the secondary mirror chamber, the primary mirror frame is fixedly connected to the primary mirror chamber, and the primary mirror frame is connected to the secondary mirror chamber frame connection. The invention sets a displacement compensation mechanism, which can fully compensate the system interval caused by temperature, effectively ensures that the image quality of the system does not change with temperature, and makes the system easy to install without increasing the volume of the original system , weight and cost.