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Magnetic coupling for parts of an optical instrument
| Details |
Inventors: Schindl, Klaus; Nyman, Georg;
Assignee: C. Reichert Optische Werke AG (Vienna, AT)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A magnetic coupling comprises two parts of an optical instrument, for example, of a microscope, which are to be releasably coupled together. A locating surface is formed on one part, this surface comprising one or more areas defined by bodies composed of a magnetic material which are spaced apart at intervals, the other part comprising a locating surface comprising areas defined by bodies composed of a material which can be magnetized. In order to avoid mechanical shocks caused by a powerful magnetic attraction as the parts are coupled, the material which can be magnetized, and which is associated with one of the locating surfaces, is confined to one or more areas of this surface, the arrangement of these areas corresponding to that of the areas on the locating surface. Other parts of the locating surface are composed of a material which cannot be magnetized. The coupling operation is carried out, firstly, by offering up one of the parts in an opposed position in which position no magnetic attraction is effective. The two parts are rotated, relative to one another when they have contacted each other, thus effecting the overlapping of the magnetic areas with the areas which can be magnetized, and thereby effecting coupling. |
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DETAILED DESCRIPTION OF THE INVENTION A first part in the form of a magnetic coupling condensor 1, which is represented in FIG.
1, is a two-element condensor for a microscope, the latter not being shown.
The condensor comprises a condensor tube-section 2 and a mounting 3, the mounting comprising a centering rim 4 (see FIG.
4).
The mounting 3 is composed of a material which cannot be magnetized, such as aluminum, and comprises an annular-shaped planar-locating surface 5.
Three permanently magnetized, or magnetic, bodies 6 are embedded in the mounting, being disposed at relative angular intervals of 120.
degree.
.
The bodies are embedded in a manner such that they lie flush in the locating surface 5.
The magnetic bodies 6, accordingly, define magnetic areas of the locating surface 5.
FIG.
1 further shows a second part of the magnetic coupling in the form of an insert 7 which carries an annular diaphragm 8, which insert is to be coupled to the condensor 1.
The insert 7 possesses a locating surface 9 which corresponds in shape and size to the locating surface 5, the insert being composed of a material which cannot be magnetized, such as aluminum.
Three bodies 10, formed of a material which can be magnetized, such as iron, are embedded in the insert, the bodies being disposed at angular intervals of 120.
degree.
relative to one another.
The bodies are embedded in a manner such that they lie flush in the locating surface 9.
The bodies 10 form areas of material which can be magnetized in the locating surface 9 which correspond to the magnetic areas of surface 5.
In a further embodiment of the magnetic coupling, not shown in the drawing, the bodies 10 are magnetized and are embedded in the insert 7, in orientations, such that the poles adjacent the surfaces 5 and 9 are of opposite polarity.
By this means, the bodies 6 and 10 attract one another when the condensor 1 and insert 7 are magnetically coupled.
Markings 11 and 12 are made at angular intervals of 120.
degree.
on a radially, outwardly-facing surface of the mounting 3, and on a radially, outwardly-facing surface of an outer rim of the insert 7
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Light Fixtures 
