90 results about "Central field" patented technology

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 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.