DE283676C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

Vr 283676 - CLASS 42 h. GROUP

Binocular periscope with variable magnification.

Patented in the German Reich from June 9 1914th

The invention relates to telescopes for binocular use with double one and Outlook. If you switch the magnification to such instruments by switching on Lenses of different focal lengths brought about, difficulties arise when these lens focal lengths in their absolute. Values differ significantly from each other.

If the optical axes of the lenses are arranged parallel to one another, the result is a very practical construction of the magnification change, especially for binocular instruments, which, depending on the number of pairs of lenses, have different levels of magnification allows.

The drawing shows a particularly important embodiment, namely a binocular instrument with two pairs of lenses, thus two kinds of magnification; daao means:

Section from a vertical section through the center of the instrument,

Section cd a vertical section through one half of the telescope of the instrument,
Sections I-II, III-IV and V-VI Cross-sections at different heights of the instrument. - · ■

The innovation is that the centers of two of the four lenses are on the same diameter of the instrument, i.e. at the same distance from the center of the same lie, whereby only one rotation of the axis in the illustrated embodiment um go ° is required to go from one magnification to the other; at multiple, e.g. B. triple change of magnification, this angle would be only 60 °. . ·

The optical axes of the objectives O ₁ O ₂ are parallel, and the images of the short focal _{length lenses are created at B 1} and the long focal length lenses at B _2.

The erection of the image is brought about in the known manner by a two-part inversion system of positive equivalent focal length, between the halves of which a parallel beam path is expediently sought; for each image thus includes an upper reversing half, namely to the image B _1, the relay lens U ₁ and B ₂ to the image reversing lens U. ₂

The four erecting lenses U ₁ and U ₂ are arranged in the same way as the four lenses on the largest diameters, namely two each lie in different planes, the difference in height corresponds to the difference in the lens focal length.

The change in magnification thus comes about by rotating the body carrying all the aforementioned optical systems / in the outer tube R in such a way that once the optical axes of the objectives O ₁ with their erecting lenses U ₁ , the other time the optical axes of the objectives O ₂ with their erecting lenses U _{2 are brought} into coincidence with the optical axes of the invariably arranged lower erecting lenses U ; the latter then design upright images at B in a known manner, which are viewed through the K eyepieces.

A vertically arranged binocular periscope is chosen as an exemplary embodiment to deflect the rays into the horizon

Claims (1)

zontale makes the prisms P ₁ and P ₂ necessary. Sponsorship τ claim: Binocular periscope with variable magnification, characterized by the arrangement of several switchable pairs of lenses (O ₁ 0 ₂ ) of different focal lengths, their optical axes below and towards each other ίο the mechanical axis of the whole instrument are arranged parallel to and at the same distance from the latter, and which are firmly connected with analog lens systems (U ₁ U ₂ ) , which lens systems represent the upper parts of a multi-part inverting system, the lower half of which consists of only two elements (U) has a positive equivalent focal length, which are assigned to the two eyepieces (K) and do not take part in the rotation of the upper systems when the magnification is changed. For this purpose ι sheet of drawings.