Patent ID: 6911643

Claim:
A monocular night-vision device with an object lens focusing residual light issuing from a subject to be observed onto an input window of a residual-light amplifier with lens systems projecting the residual light that has been amplified by the residual-light amplifier within a given range or wavelengths onto a receptor located on a receptor ray axis and with at least reflecting elements bending the beam path of the light through the night-vision device, comprising: wherein the first, second, third, and fourth reflective elements each have a reflecting surface having a mutual pairwise orientation under an invariable angle; wherein said first reflective element directs the incident light coming from the direction of an object lens axis which in general contains the object lens into the direction of an amplifier axis which in general contains the residual-light amplifier, the second reflective element directs the light into the direction of a connecting axis which, where applicable, contains a device socket for a coupling-in or coupling-out device, the third reflective element directs the light into the direction of an eyepiece axis which in general contains an eyepiece, and the fourth reflective element directs the light into the direction of the receptor axis which, essentially, is parallel to the object lens axis; wherein the reflecting surfaces of at least one pair of the reflective elements are in coplanar alignment; at least one optical component between at least one pair of the four reflective elements, said at least one optical component chosen from: the object lens, at least one object lens part of an object lens that, where applicable, is made in two parts, the residual-light amplifier, the eyepiece, at least one eyepiece part of an eyepiece that, where applicable, is made in two parts, and at least one device socket for a coupling-in or coupling-out device; wherein a reflecting surface of a reflective element located on the receptor ray axis is essentially reflective for the given range of wavelengths of the residual-light amplifier and, where applicable, to the contrary, is essentially transparent for other ranges of wavelengths; and wherein the first reflective element can be rotated about the amplifier axis and the fourth reflective element can be rotated about the eyepiece axis relative to the reflective elements arranged between them, while maintaining the parallelism of the object lens axis and the receptor ray axis.