DE1852999U - DEVICE FOR CONTINUOUS CHANGING THE STEREO BASE IN STEREOMICROSCOPES. - Google Patents

Description

Device for continuously changing the stereo basis in stereo microscopes When using a stereo microscope, the observer has a solid stereo base given. In many cases, a different stereo base than the one given would be more appropriate. A smaller stereo base enables z. B., also deep through narrow tubes Viewing objects stereoscopically, a larger stereo base increases the stereoscopic one Effect when viewing surfaces.

So it is desirable to continuously change the stereo base to be able to adapt to the task at hand. So you want z. B. at Operations through an ear speculum reduce the stereo base so much that one can view the operating field stereoscopically; another downsizing on the other hand would the stereoscopic effect and thus the security of the depth localization unnecessarily affect.

The object of the invention is to solve this problem Stereo microscopes, their observation beam paths through a common main lens onto the object be brought together and focused. The prerequisite for applicability is that the two observation beam paths on the image side of the main lens in run at least approximately parallel to each other and to each other.

An exemplary embodiment is shown schematically in FIG.

There are four prisms with 1, 2, 3, 4 'with the same refractive angles designated. The prism pairs 1 and 3 as well as 2 and 4 are expediently mounted together or made from one piece. The variable distance between the two pairs of prisms (1,3) and (2,4) are denoted by d. a and b are the distances between the centers of the two Observation beams from each other before and after penetrating the prism combination.

From the figure it can be seen that through continuous Change of the distance d of the prism pairs the center-to-center distance of the observation beams and thus allows the stereo base of the device to change continuously.

This change in distance is synchronized, for example, with the aid of two actuated spindles 5 and 6, each of which has two opposing threads. Thus, depending on the direction of rotation, there is an approach or an increase in distance achieved.

If one assumes a basis given at distance d = 0, then can depending on the arrangement of the entire prism combination relative to the direction of the light rays with the increase in the distance d an increase or decrease in the Reach the base.

Assuming a mean distance d, the This / S% san5e'corresponding base length with constant 'Arrangement by changing d in both directions optional wise enlarge or reduce.

Figure 2 shows a schematic representation of a stereo microscope, the housing 10 is cut open so that the items located therein are visible. The one coming from the object in object plane A-A The beam path runs through the main objective 9, the prism arrangement connected downstream of it 1-6 according to the invention, the variable Galilean telescopic tubes 7 and 8 of the magnification changer with the rotary knobs 11 and l, the downstream partial objectives 13 and 14 and the in the eyepiece socket 15 and 16 located eyepieces to the eyes of the observer.

Claims (1)

Protection claims 1. Prism arrangement to achieve a variable base length in stereomicroscopes with a main objective bringing the jjeobachtungsstrahlpaths onto the object, characterized by two prism pairs (1, 3 and 2,4) with mutually identical refractive angles (), which in the optical axis of this objective against each other are arranged displaceably such that the prismatic effect is canceled at the mutual distance d = 0. 2. prism arrangement according to claim 1, characterized by one or two counter-rotating spindle drives (5, 6).