41 results about "Mangin mirror" patented technology

A design for inspecting specimens, such as photomasks, for unwanted particles and features such as pattern defects is provided. The system provides no central obscuration, an external pupil for aperturing and Fourier filtering, and relatively relaxed manufacturing tolerances, and is suited for both broad-band bright-field and laser dark field imaging and inspection at wavelengths below 365 nm. In many instances, the lenses used may be fashioned or fabricated using a single material. Multiple embodiments of the objective lensing arrangement are disclosed, all including at least one small fold mirror and a Mangin mirror. The system is implemented off axis such that the returning second image is displaced laterally from the first image so that the lateral separation permits optical receipt and manipulation of each image separately. The objective designs presented have the optical axis of the Mangin mirror image relay at ninety degrees to the optical axis defined by the focusing lenses, or an in-line or straight objective having one ninety degree bend of light rays.

A catadioptric imaging system for micro-lithographic projection features a high numerical aperture objective where most of the focusing power is produced by reflection and refraction angles are limited to avoid additional aberration. A field correcting optic is appended to a Mangin mirror in an immersive configuration for raising the numerical aperture. The optical connection between the Mangin mirror and the field correcting optic is arranged to control refraction angles by limiting angles of incidence or refractive index differences. A radially symmetric polarizing effect is achieved in a pupil to improve image contrast.

A reduced size catadioptric inspection system employing a catadioptric objective and immersion substance is disclosed. The objective may be employed with light energy having a wavelength in the range of approximately 190 nanometers through the infrared light range, and can provide numerical apertures in excess of 0.9. Elements are less than 100 millimeters in diameter and may fit within a standard microscope. The objective comprises a focusing lens group, a field lens, a Mangin mirror arrangement, and an immersion substance or liquid between the Mangin mirror arrangement and the specimen. A variable focal length optical system for use with the objective in the catadioptric inspection system is also disclosed.

A system and method for simultaneous imaging of both infrared and millimeter wave radiation. The novel optical system (10) includes a primary mirror (20), a Mangin secondary mirror (30) positioned to receive energy reflected from the primary mirror (20), and an immersion lens (40) for focusing energy received from the Mangin mirror (30). In the illustrative embodiment, the primary mirror (20) and Mangin mirror (30) are arranged in a Cassegrain configuration. Central to this invention is the use of a negative power refractive Mangin mirror (30) as the Cassegrain secondary mirror, so that the field curvature of the secondary mirror (30) and immersion lens (40) can be made to cancel. The immersion lens (40) effectively decreases the wavelength of the millimeter wave radiation, allowing a smaller detector to collect the same amount of radiation as would a larger detector in air. In the illustrative embodiment, the system (10) further includes a detector array (52) placed in intimate contact with the immersion lens (40).

The invention provides a telecentric imaging system with field of view of 15 degrees and three coaxial reflectors, belongs to the space optics technical field, and relates to a telecentric off-axis three-reflector imaging system. A technical problem to be solved is providing a telecentric imaging system with field of view of 15 degrees and three coaxial reflectors. A technical scheme is as follows: the imaging system comprises a main mirror, a second mirror, a third mirror, an aperture diaphragm and an imaging surface, the main mirror, the second mirror, the third mirror and the aperture diaphragm are coaxial, and the main mirror and the third mirror are coplanar; the second mirror is placed on a reflected light path of the main mirror, the third mirror is placed on a reflected light pathof the second mirror, and the aperture diaphragm is placed on a mirror plane edge of the second mirror; in order to realize telecentric image space, a distance from the aperture diaphragm to the third mirror is half of a summit radius of curvature length of the third mirror; in order to realize wide field of view of 15 degrees, the second mirror is a convex spherical mirror, and the main mirror and the third mirror are concave quarticsurface mirrors; a distance from the second mirror to the third mirror is larger than half of a system image space focal length. According to the system, abundant ground resource information is obtained, and the system has low processing and adjusting difficulty.

The invention relates to a wide-angle projection optical system between an object side and an image side. The wide-angle projection optical system comprises a first optical system and a second optical system. The first optical system comprises a first lens unit and a second lens unit. The second optical system comprises a Mangin mirror. The first lens unit with positive effective optical power comprises an aperture diaphragm, provides the optical feature matching projection light rays of the object side and collects the light rays onto the aperture diaphragm. The second lens unit behind the first lens unit has the positive effective optical power. Relative to the first lens unit, the aperture diaphragm and the second lens unit, the Mangin mirror is closer to the image side. The first lens unit and the second lens unit form distortion real images at the front of the Mangin mirror which is provided with a penetration face and a reflection face, in this way, the light rays are subjected to the secondary refraction and the primary reflection, so that an image distortionless after zooming is generated on a screen and thinned, with aberration thereof reduced.

An IR microscope (1) is constituted such that, in an optical viewing mode in a beam path of visible light (VIS-R, VIS-T), a first intermediate focus (ZW1) is imaged onto a flat detector surface (15a) of a camera. The IR microscope (1) is constituted such that, in the beam path of the visible light (VIS-R, VIS-T), the first intermediate focus (ZW1) is imaged onto a second intermediate focus (ZW2), and, in the second intermediate focus (ZW2), a Mangin mirror (11) is disposed that corrects a field curvature of the Cassegrain objective (4). The invention provides an IR microscope in which the field curvature generated by the Cassegrain objective is corrected in a simple manner in the optical viewing mode when detection is performed using a flat detector and without restricting the spectral range of the IR microscope.

A relatively high spectral bandwidth objective employed for use in imaging a specimen and method for imaging a specimen is provided. The objective comprises a lens group having at least one focusing lens configured to receive light energy and form an intermediate image, at least one field lens oriented to receive the intermediate image and provide intermediate light energy, and a Mangin mirror arrangement positioned to receive the intermediate light energy and apply light energy to the specimen. The objective may provide, in certain instances, a spectral bandwidth up to approximately 193 to 266 nanometers and can provide numerical apertures in excess of 0.9. Elements are less than 100 millimeters in diameter and may fit within a standard microscope. The field lens may comprise more than one lens and may be formed of a material different from at least one other lens in the objective.

An optical illumination system and an image projection system including the same include a light source, at least one illuminating lens and a Mangin mirror that illuminate light emitted from the light source on a predetermined reflective device, the Mangin mirror including a concave refracting surface that refracts and transmits light incident from the illuminating lens, and a convex reflecting surface disposed behind the concave refracting surface to internally reflect the light refracted by the concave refracting surface back toward the concave refracting surface and tilted with respect to the illuminating lenses. The light reflected from the convex reflecting surface and then refracted through the concave refracting surface propagates along a path that is different from a path of the light emitted from the illuminating lens.

A wide-angle projection optical system includes, between an object side and an image side, a first optical system including a first lens group having an aperture stop and a second lens group disposed behind the aperture stop, and a second optical system including a Mangin mirror. The first and second lens groups have positive power. The first lens group provides optical characteristics to match with a light coming from the object side and converges the light toward the aperture stop. The first and second lens groups are configured to form an aberrated real image. The Mangin mirror is disposed closer to the image side than others. The Mangin mirror includes a refracting surface and a reflecting surface for refracting the light two times and reflecting the light one time, thereby producing an enlarged real image on a screen. Therefore, the image distortion is reduced, and the image quality is enhanced.

A system and method for inspection is disclosed. The design includes an objective employed for use with light energy having a wavelength in various ranges, including approximately 266 to 1000 nm, 157 nm through infrared, and other ranges. The objective includes a focusing lens group having at least one focusing lens configured to receive light, a field lens oriented to receive focused light energy from said focusing lens group and provide intermediate light energy, and a Mangin mirror arrangement positioned to receive the intermediate light energy from the field lens and form controlled light energy. Each focusing lens has a reduced diameter, such as a diameter of less than approximately 100 mm, and a maximum corrected field size of approximately 0.15 mm. An immersion substance, such as oil, water, or silicone gel, may be employed prior to passing controlled light energy to the specimen inspected.

The invention discloses an optical path of a multispectral polarization scanning radiometer based on a reflecting telescope system. The optical path comprises a pre-posed scanning mirror set, a telescope system and a main measuring optical path, wherein the pre-posed scanning mirror set is composed of a first planar mirror and a second planar mirror both which are orthogonal and installed on a remote sensing platform; the film layers of the first and second planar mirrors are silver reflection films respectively; the telescope system comprises a main mirror, a secondary mirror and a field diaphragm; the main mirror and the second mirror are concave parabolic mirrors and each plated with the a silver reflection film; the main measuring optical path comprises a polarizing component, multiple color separation filters, multiple reflector plates, multiple focusing lenses, multiple narrow band filters and multiple detectors. Because the reflecting telescope system is applied, the difference factors affecting the polarization measurement precision are reduced; the system is low in residual system polarization, wide in spectral range, flexible in amounts and positions of spectrums, high in transmittance, low in processing and installing precision and system cost.

A multi-wavelength laser interferometer comprises a laser, an aperture diaphragm, a beam expanding secondary mirror, a pinhole diaphragm, a beam splitter prism, a collimating main mirror, a transmission standard mirror, a piezoelectric ceramic transducer, a to-be-measured plane element, a reflection standard mirror, an imaging lens, a hyperspectral camera and a computer. The collimating main mirror in the interferometer is composed of three lenses, and the imaging lens and the beam expanding secondary mirror are identical in parameter and are both single lenses; and in order to reduce the processing difficulty of the lenses in the interferometer and the difficulty of light path adjustment of a whole system, the beam expanding secondary mirror and the collimating main mirror are each provided with one surface which can be a plane. The multi-wavelength laser interferometer can be used for measuring transmission wavefront or reflected wavefront of the to-be-measured plane optical elementin the wavelength range of 600 nm-1600 nm.

The invention discloses a compact type coaxial refraction and reflection type telescope objective. The surfaces of all components of the telescope objective are spherical surfaces. The telescope objective comprises a front-group concave lens, a front-group positive lens, a main reflecting mirror, a Mangin mirror, a rear-group concave lens and three rear-group positive lenses, wherein the telescopeobjective is in rotational symmetry relative to a main optical axis, and an aperture diaphragm is positioned on a main reflecting mirror; the middle of the front-group concave lens, the middle of thefront-group positive lens and the middle of the main reflecting mirror are independently provided with a hole; after an incident ray from ground scenery is refracted through the front-group lenses, the incident ray reaches the main reflecting mirror; after the incident ray is focused, the incident ray passes through the front surface, the rear surface and the front surface of the Mangin mirror insequence without hindering in sequence; and after the incident ray is refracted by the rear-group concave lens and three rear-group positive lenses in sequence, the incident ray passes through the center hole of the main reflecting mirror without hindering to finally reach an image surface. The telescope objective has the advantages of long focal length, low cost, small volume, light weight, compact structure, good imaging quality, easiness in processing and adjustment and the like.

A system for use with a reduced size catadioptric objective is disclosed. The system including the reduced size objective includes various subsystems to allow enhanced imaging, the subsystems including illumination, imaging, autofocus, positioning, sensor, data acquisition, and data analysis. The objective may be employed with light energy having a wavelength in the range of approximately 190 nanometers through the infrared light range, and elements of the objective are less than 100 mm in diameter. The objective comprises a focusing lens group and at least one field lens oriented to receive focused light energy from the focusing lens group and provide intermediate light energy. The objective also includes a Mangin mirror arrangement. The design imparts controlled light energy with a numerical aperture in excess of 0.65 and up to approximately 0.90 to a specimen for imaging purposes, and the design may be employed in various environments.

A portable transceiver of one or more signals includes an input, frequency modulation, a splitter and a plurality of lasers in a transmitter module. A receiver module includes a Mangin mirror aligned with an input aperture. A photodiode receives the signal from the mirror for subsequent demodulation. An interference filter is arranged between the mirror and the photodiode. The filter is hemispherical, having a center of curvature at the focal point of the mirror. The transceiver may include a video camera and gyro-stabilizer accessories. A visual siting scope is aligned with the lasers and the receiver. A separate transceiver for ethernet input signals interfaces with a 10/100 ethernet switch and does not employ frequency modulation.