An image forming screen for optical systems has a Fresnel plastic lens having a replica of a ground glass surface on the surface opposite to that of the rings. The image surface is coated with a thin layer of optically clear epoxy material increasing the brightness of images formed on the screen.

A stereoscopic remote viewing system includes a pair of spaced apart cameras mounted on a platform which is movable along a semicircular support track for azimuth aiming of the cameras. The track is pivotable about a diametric axis for elevation aiming of the cameras. The cameras are connected through selection switches to a head worn video display unit having a pair of cathode ray tubes (CRT's) mounted therein. Lenses and mirrors are positioned to project the images reproduced by the CRT's indi...

A hand-held viewing device is provided which creates a stereoscopic illusion when flat subject matter is viewed. The device is comprised of a housing which defines two parallel and identical rectangular channels in contiguous side-by-side juxtaposition, and confines first and second flat reflectors which shift upwardly the line of sight through said channels.

A co-reviewing device has a body having a connecting portion detachably connected to the eyepiece section of an endoscope, and having a main eyepiece section to which a photographing device can be connected. A sub-eyepiece section is connected to the body. A support frame 21 supporting a half prism and a transmitting prism is arranged in the body to be movable between a first position where the half prism is on the optical axis of the beam, which is sent from the endoscope into the body, to divi...

An optical system comprises a number of optical elements arranged in a housing. The housing may be fixed to the underside of an airship. The system corrects for picture tilt. The housing comprises a first fixed portion, a second portion rotatable relative to the first portion around an axis XX', and a third portion rotatable relative to the second portion around an axis YY' orthogonal to XX'. The combination of the rotating motions of the portions B and C of the housing render it possible to rot...

The disclosed bookholder incorporates a viewing window with either an integral or detachable magnification element that permits magnified viewing of the pages held beneath the viewing window.

An electronic stereoscopic viewing device has an electronic signal generator which is coupled electronically to a liquid crystal display screen. The display screen upon receipt of a signal from the signal generator displays first and second views of an image with the first and second images being parallactically displaced with respect to one another. A first optical pathway conducts the first parallactically displaced view to a left eye viewing port and a second optical pathway conducts the seco...

The present invention is directed towards a portable video viewing mechanism comprising a housing generally in the form of a binocular configuration being dimensioned and configured to be hand-held and manually directed towards a predetermined field of viewing. An adjustable object lens assembly observes the predetermined field of viewing and additional processing assemblies converts the resulting visual image into electrical video signals which are transferred to a remotely located video record...

An eye shield or eyepiece for a viewing device, especially for a day and night vision sighting device for aiming a weapon essentially comprises a headrest and first and second mounting frames. These components form an assembly for mounting on the housing of a viewing device. For the practical manipulation and adaptation of the headrest to the form of the head of the observer, two hinge-like articulations are provided in mutually spaced relationship on the external face of a forehead rest of the ...

An infrared viewing apparatus is described which comprises an infrared objective, a pivotal mirror, a linear infrared detection array, an amplifier arrangement connected to this array, and a display array which is driven by the amplifier arrangement and is imaged onto a plane of observation via the back of the pivotal mirror. By arranging a beam splitter in the radiation path between the display array and the pivotal mirror, which beam splitter transmits a part of the visible radiation to a line...