Abstract: A night-viewing light amplifying viewer with a battery voltage driven light amplifier, operation of the focusing control and the electrical on/off-switch for the light amplifier being united to take place by the same operating device of suitably chosen dimensions.

Abstract: A image intensifier binocular, so-called goggle, of the type having only one image intensifier tube (2) is working with an effective diameter of its entrance photocathode (3) below 15 mm and therefore an objective (1) having an accordingly shortened focal length. This combination will substantially increase the depth of field of the goggle and also enable a design of smaller weight.

Abstract: A compact night observation viewer has one light amplifier and two eyepieces in the horizontal plane under the input aperture, and where one eyepiece can be folded out of the beam path so that a free through-view passage is opened through the viewer, whereby the observed scene can also be observed without light amplification. The invention solves thereby the problem of how in a technically and economically satisfactory way it is able to freely change between binocular and monocular vision. As an addition and optionally, the invention permits the distance between the two eyepieces to become adjustable and that a teleconverter can be applied in front of the light amplifier input and possibly also in above described free through-view opening so that magnification can be switched both with and without light amplification.

Abstract: A folded image intensifier viewer with an asymmetric viewing system and a single image intensifier and two eyepieces able to regulate the mutual distance between the eyepieces, after a beam splitter which divides the beam path into two extremely asymmetric parts, for each eyepiece a lens system is provided with at least one having at least two lenses.

Abstract: Method of designing a compact binocular night vision instrument with an electronic image intensifier (2) which is oriented so that its symmetry axis forms a right angle with the line of sight (19) between the night vision binocular and the scene to be observed. The total forward length thereby becomes particularly short, thus reducing the downward torque which is troublesome when the night vision binocular is carried like a pair of spectacles, attached to the head (generally called night vision goggles). The total forward length may be even further reduced if the symmetry axis of the objective lens (1) is also at right angles with the line of sight (19). These measures makes feasible a simple beam splitter system where the optical axis through one of the eye pieces (13B) intersects the common optical axis beam splitter (14), and to design an instrument enclosed in a single housing having a smooth exterior shape which is easy to grasp.

Abstract: A night vision instrument with an electronic image converter, comprising for example an image intensifier tube or a similar device. This night vision instrument (FIG. 3) may be located beside an ordinary telescope, sight, TV-camera or similar device (6) so that this same device may be used during night time. The combined system (FIG. 3) thus arranged is very compact, with the center of gravity close to the user during handheld operation. The lightgathering objective lens consists moreover of only one mirror (1) and the image emerging on the screen (3) of the electronic image converter is facing the corresponding object being viewed. The image on the screen (3) is finally collimated so that it may pass into the entrance aperture of some other instrument (6) in parallel, and this image transfer is accomplished with three reflections or less and without any intermediate real image.