The invention relates to a compact, slimmed-down, low-cost optical system and electronic equipment that incorporates the same. The optical system at least comprises a stop 2, at least one object-side reflecting surface 12 located on the object side with respect to the stop 2 and inclined from the optical axis of the optical system, at least one image-side reflecting surface 22, 23 located on the image side of the optical system with respect to the stop 2 and inclined from the optical axis, and a...

Catoptric lens arrangements for changing the direction of a beam of wave-propagated energy are shown. In one class of embodiments, the beam is directed through an entrance lens assembly toward a first focal point. A steering lens assembly, the first mirror therein having a focal point coincident with the first focal point, is arranged to be moved relative to the entrance lens assembly to affect the desired steering. In another class of embodiments, the entrance beam lens assembly is adapted to p...

A coude gimbal structure includes a two-axis gimbal system having an outer gimbal pivotable about a first rotational axis, and an inner gimbal supported on the outer gimbal and pivotable about a second rotational axis which intersects the first rotational axis at an intersection point. A folded afocal three-mirror anastigmat has a positive-optical-power primary mirror, a negative-optical-power secondary mirror, and a positive-optical-power tertiary mirror, and a first flat fold mirror, and a sec...

A method and apparatus for laminating sheets in a continuous manner is disclosed. The method comprises locally compressing the sheets in overlapping sections between the loading planes of two loading elements, at least one of which oscillates at a frequency between 0.1 and 1,000 cycles per second. The apparatus comprises loading means comprising two loading elements for compressing the sheets, driving means for transporting the sheets between the loading elements and activating means for oscilla...

An optical imaging system is described which includes a mirror system comprising a convex spherical mirror and an apertured concave spherical mirror having coincident principal axes. It is shown that by placing a plane mirror and a second convex spherical mirror in the path taken by the rays which emerge from the mirror system the focal distance can be increased, resulting in an acceptable light-shadow ratio with a non-excessively large aperture and also in a very good correction for spherical a...

A reflective optical system includes a flat mirror having a centrally disposed opening, and being obliquely mounted relative to an annular collimated supply beam of electromagnetic energy such as provided by a laser, an annular concave mirror to which the beam is reflected from the flat mirror, and a circular convex mirror mounted in the opening defined by the flat mirror, to which the beam is reflected from the concave mirror, the beam then being reflected from the convex mirror and passing thr...

A compact, all-reflecting optical system for viewing distant objects. The system comprises a negative convex secondary mirror placed between a positive concave primary mirror and a positive concave tertiary mirror. The system has an eccentric field of view in that the field of view lies entirely on one side of the optical axis, and because of this, the light travelling from the object to the image will pass entirely outside the secondary mirror, both when entering the system and when travelling ...

The dual-secondary mirror optical system utilizes, in principle, the Cassain optical system. An apertured, single, primary mirror is coaxially aligned with two secondary mirrors to provide coaxial transmit and receive optical paths. Separation of the optical paths is in radial distance from the central optical axis. An apertured secondary mirror in conjunction with the primary mirror directs the transmitted beam, providing a hollow expanded output beam. The other secondary mirror in conjunction ...

A reflective mirror system for controlling the supply beam of a laser is provided. The system includes a first mirror having the surface of a partial section of the surface of a paraboloid of revolution and mounted in a housing relative to a collimated beam such as produced by a laser, so as to reflect the beam from the direction of travel on to a second mirror. From the second mirror the beam is reflected through an opening in the first mirror and converged to a point of focus for doing useful ...

A non-relayed optical system is used off-axis in both aperture and field angle relative to an optical axis (32), and employs three reflective lens elements (34, 36, 38). The system is useful for viewing radiation from a distant object, the radiation allowed to enter the system through an opening in a real and accessible entrance pupil (44) that is disposed in front of a concave primary mirror (34). Because the entrance pupil of the system is real and not virtual, the aperture stop of the system ...