Untitled record

<img file="AT224359B_D0001.tif" />

AUSTRIAN PATENT OFFICE Kl.42h, i; / oi

PATENT NUMBER NO. 224359

Issued on 26th November 1962

C. REICHERT OPTISCHE WERKE AKTIENGESELLSCHAFT IN VIENNA

Upright microscope

Registered on July 14, 1961 (A 5446/61) .- Beginning of the patent period: April 15, 1962. The inventor named is: Ing. Karl Wasner in Vienna.

When focusing a microscope and when placing the specimen on the stage and in manipulations on the applied specimen, the observer must be able to see the middle part of the table surface and the specimen itself with the naked eye.

In microscopes, whose tripod is directed to the observer, so in the so-called dorsal Auf5 position, the tripod obstructs this view and the observer is forced to tilt his head strongly to the left or right to be able to look past the tripod both eyes. This is cumbersome because the normal posture is disturbed for comfortable viewing at the viewing tube. The tripods of such microscopes are therefore made as narrow as possible, which, however, adversely affects their stability.

For this reason, it has recently been decided to build microscopes so that they can be set up with a stand facing away from the observer. If the observer, instead of through the eyepieces, wants to look directly at the microscope stage and the object with his naked eye, he only has to take his head back a bit.

However, this so-called frontal listing has the disadvantage over the dorsal that one must use expensive, artificial light sources. The illumination mirror provided on the dorsally used microscopes, which is intended to guide daylight or the light of normal lamps to the specimen via the condenser, can not be used in a frontal position, because the microscope stand is on the side opposite the observer, but the manipulating hands are on the right and left of the observer, the incoming light shade.

Microscopes having a substantially S-shaped tripod have also become known (see German Patent No. 804376). It is used so that the lower part of the tripod is dorsal, the upper part but frontally. This ensures that with an unobstructed view of the object and the illumination mirror for daylight can be used. A disadvantage of this construction but that the tripod is very prone to vibrations due to its peculiar shape and therefore that the microscope is very susceptible to vibration.

The present invention aims to eliminate all the deficiencies described and to produce good visibility even on dorsally used microscopes in a stand form that ensures proper stability. It relates to a microscope, which is characterized in that in the stand in the height between eyepiece and stage a view of the object releasing opening is provided. With this construction, the tripod width can even be increased in consideration of the stability in comparison to conventional constructions.

An embodiment of the invention is that the opening receives an optical system for viewing the object. In this case the observer sees the object table and the object enlarged.

It is particularly useful if according to the invention, the optical system has an adjustable focal length, because then the adaptation of the system to possible ametropia of the observer is possible and the annoying placement and removal of the eyeball is avoided in the transition from eyepiece to magnifier observation, in a simple case wherein said variable focal length optical system consists of a condenser lens and a diverging lens whose pitch is variable from each other. On the other hand, for simpler requirements, the optical system according to the invention can also be designed with a constant focal length, where appropriate as a simple or as an achromatic convex lens. Figs. 1-4 show

Nr.224359

Exemplary embodiments of the invention.

Fig. 1 is a view of a dorsally mounted microscope drawn, the side elevation, partially in section in Fig. 2 is shown. His foot 1 carries the tripod 2, is mounted on the det tube 3 with insight 4, which latter example is assumed to be binocular. The table 5 carries the preparation 6. 5 The drive knobs 7 serve by means known to adjust the table 5 in the vertical direction. The mirror 8 inserted in the foot 1 deflects the light via the condenser 9 onto the object 6 and the objective 18. The relatively wide stand 2 contains a recess 10 through which the eye of the observer located at 11 can bend directly onto the object 6. When viewed normally through the eyepiece 4, the eye is at a close distance 12.

3 shows in cross-section a detail of the stand 2 with the recess 10, in which the achromatic lens 13 is mounted by means of the two mounting parts 14 and 15 here. Focal length of the lens 13 and its distance from the object 6 (Figures 1 and 2) are chosen so that the normal-sighted observer sees a virtual, upright and magnified image of the object. FIG. 4 again shows the same detail for an embodiment in which a fixed converging lens 16 and a diverging lens 17 adjustable in the direction of the double arrow aiming at the object are installed in the stand 2. The maximum focal length of the system formed by the two lenses can be continuously changed by increasing the distance between the two lenses and so be brought to the size required by any deficient sight of the observer.