88 results about "Central field" patented technology

An EUV optical projection system includes at least six reflecting surfaces for imaging an object (OB) on an image (IM). The system is preferably configured to form an intermediate image (IMI) along an optical path from the object (OB) to the image (IM) between a secondary mirror (M2) and a tertiary mirror (M3), such that a primary mirror (M1) and the secondary mirror (M2) form a first optical group (G1) and the tertiary mirror (M3), a fourth mirror (M4), a fifth mirror (M5) and a sixth mirror (M6) form a second optical group (G2). The system also preferably includes an aperture stop (APE) located along the optical path from the object (OB) to the image (IM) between the primary mirror (M1) and the secondary mirror (M2). The secondary mirror (M2) is preferably concave, and the tertiary mirror (M3) is preferably convex. Each of the six reflecting surfaces preferably receives a chief ray (CR) from a central field point at an incidence angle of less than substantially 15°. The system preferably has a numerical aperture greater than 0.18 at the image (IM). The system is preferably configured such that a chief ray (CR) converges toward the optical axis (OA) while propagating between the secondary mirror (M2) and the tertiary mirror (M3).

The physiological characteristics of the eye are particularly well taken into account in a motor vehicle by selecting a representation at a representation site from at least two types of representations depending on whether the respective representation site is located in a central field of view of the vehicle operator or is located in a peripheral field of view of the vehicle operator. Preferably, intensive colors and strong color contrasts are selected in the central field of view of the vehicle operator, whereas representations that change over time are selected in the peripheral field of view.

A faced building insulation assembly includes a first facing forming a first major surface of the assembly with a central field portion having one or more spunbond continuous polymeric filament mat layers. Preferably, the facing is fungi growth resistant and has a selected water vapor permeance rating as applied to an insulation layer of the assembly. The facing may also include one or more polymeric film layers, a fungi growth inhibiting agent, a pesticide, and / or a heat activated bonding agent that bonds the facing to the insulation layer of the assembly. The insulation assembly may also include a second facing forming a second major surface of the assembly that has a water vapor permeance rating equal to or differing from the first facing.

An image observing apparatus has two light sources, a scanning mirror upon which light beams from the two light sources are incident in common, and two optical systems. The two optical systems respectively lead the light beams emitted from the two light sources and scanned by the scanning mirror to the right and left eyes of an observer. The light beams emitted respectively from the two light sources are scanned by the scanning mirror and form two-dimensional images for the right and left eyes on predetermined surfaces. Central field angle principal rays emitted respectively from the two light sources and reflected by the scanning mirror, exist on the same plane. Then, an angle made by the scanning mirror and by a surface vertical to the central field angle principal rays emerging from the two optical systems, is set so as to fall within a predetermined range.

An optical receiving device capable of controlling optical efficiency in a subdivision field. The optical receiving device comprises a receiving main lens, a DMD, a light absorbing body, a collimatinglens, a narrow band optical filter, a focusing lens, a detector, and a DMD driving control module. The optical receiving device can attenuate strong receiving light in a central small field and ensure weaker receiving light in a marginal large field to be received by the high sensitivity detector, thereby effectively overcoming the problem of signal saturation in he central field when laser radarmeasures a strong scattering medium. On the basis of ensuring the optical efficiency of the received light in the marginal large field, the optical receiving device achieves attenuation to the received light in the central small field, so as to effectively improve dynamic detection range of a laser radar system in strong scattering media such as water and fog.

The invention provides a fixing device and an image forming device for stabilizing the mobility of a fixing component and inhibiting the deformation of the fixing component close to outlet of a recording medium, wherein a nip portion is formed between the fixing component and a pressing component. By utilizing the method, the scraping plate (28) is in close sliding contact with two end parts of afixing belt (21) in width direction so as to prevent the fixing belt (21) from moving relative to the width direction, stabilize the movement of the fixing belt (21) and reduce the leakage of a lubricant between the fixing belt (21) and a retaining component (22). Furthermore, according to the rigidity of the fixing belt (21) in width direction, the scraping plate (28) is in sliding contact with an obviously deformed portion in circumferential surface of the fixing belt (21), that is, the portion in sliding contact with the scraping plate (28) can inhibit interspace and deformation in whole width direction, even if in the central field of a recording medium passage in width direction.

The invention discloses a multi-aperture variable spatial resolution bionic thermal imaging method and device. The multi-aperture variable spatial resolution bionic thermal imaging method and device in the invention can eliminate the contradiction between large field-of-view search and high-resolution imaging, realize target space information acquisition and rapid detection of moving targets, andincrease the target detection / recognition capability. The multi-aperture variable spatial resolution bionic thermal imaging method and device in the invention utilizes a plurality of sets of single-aperture infrared imaging detector components with fixed tilt angles to image the target, partial overlap of the field of view is formed, and the field of view is divided into multiple sub-fields; the more the overlapped detectors are, the higher the resolution of the region is; a visual mode of large field-of-view search and central field-of-view resolution similar to the human eyes is constructedthrough large field-of-view splicing and high resolution image processing so as to achieve the basic functions of multi-aperture variable spatial resolution bionic thermal imaging and alleviate the contradiction between the field of view and the high resolution; and a multi-view stereo vision with divergent visual axis is formed by using the overlapped field formed by the sub-aperture, so that target space positioning and rapid detection of the moving target can be realized.

An EUV optical projection system includes at least six reflecting surfaces for imaging an object (OB) on an image (IM). The system is preferably configured to form an intermediate image (IMI) along an optical path from the object (OB) to the image (IM) between a secondary mirror (M2) and a tertiary mirror (M3), such that a primary mirror (M1) and the secondary mirror (M2) form a first optical group (G1) and the tertiary mirror (M3), a fourth mirror (M4), a fifth mirror (M5) and a sixth mirror (M6) form a second optical group (G2). The system also preferably includes an aperture stop (APE) located along the optical path from the object (OB) to the image (IM) between the primary mirror (M1) and the secondary mirror (M2). The secondary mirror (M2) is preferably concave, and the tertiary mirror (M3) is preferably convex. Each of the six reflecting surfaces preferably receives a chief ray (CR) from a central field point at an incidence angle of less than substantially 15°. The system preferably has a numerical aperture greater than 0.18 at the image (IM). The system is preferably configured such that a chief ray (CR) converges toward the optical axis (OA) while propagating between the secondary mirror (M2) and the tertiary mirror (M3).

Monocular or binocular viewing system including a first display (1) and a first optical assembly including a first optical relay (2) and a partially transparent first optical mixer (3), said first optical relay (2) including a first forehead lens, said first optical assembly forming a second image at infinity of a first image displayed by the first display (1), the viewing system being intended to be worn on the head of a user, the first optical mixer (3) being placed in front of one of the two eyes of the user, the exit optical pupil of the first optical assembly being placed level with said eye, the optical axis of the first optical assembly corresponding to the light ray of the central field of view passing through the centre of the exit optical pupil, the first optical mixer (3) being a thin plate having substantially parallel curved faces, each face being defined by a polynomial relationship or a file of points defining a free-form. In the system according to the invention, the optics are said to be crossed, i.e. in the case of a binocular system, if an optical mixer is placed in front of the right eye of the user, the optical relay and the corresponding display are placed in a forehead position above the left eye of the user and under the optical mixer located on the left side. This arrangement is obtained by judiciously choosing the geometric parameters of the various optical elements, their curvatures and the shape of their surfaces: - the inclination of the first optical mixer to the optical axis is about 35 degrees; - the distance separating the exit pupil from the point of intersection of the optical axis and the first optical mixer is about 60 millimetres; and - the inclination of the mean optical axis between the first optical mixer and the first forehead lens in a vertical plane and relative to a straight line joining the centres of the two eyes is about 25 degrees, so that the first optical relay is located level with the forehead, and above the other eye, of the user, position crossed with the first optical mixer.