CS266868B1 - Device for connecting two rotating parts of a magnetic circuit - Google Patents

Abstract

The essence of the device is that inside the casing of the first rotating part of the magnetic circuit, a circumferential groove is formed, into which a spring-loaded locking ring fits, against which a ring connected by screws to the flange of the second rotating part of the magnetic circuit rests. It is intended mainly for magnetic circuits of electron microscope lenses.

Description

BACKGROUND OF THE INVENTION The invention relates to a device for connecting two rotating parts of a magnetic circuit, in particular electron scanning microscope lenses.

Magnetic circuits of electron microscope lenses cannot be made from a single piece of magnetically conductive material, either from functional or constructional or clinical reasons. It is then necessary to insert the excitation coils or another portion of the microscope tube into a cavity formed or enclosed from two parts of the magnetic circuit, such as a deflection or scanning coil, a stigmator and the like. These parts of the magnetic circuit must then be fixed to each other with a defined accuracy. Likewise, it is necessary to interconnect the entire individual circuits or groups of circuits with other tube systems in one stable unit, since only then can the microscope tube be the cause of the parasitic properties of the entire electron-optical device. In portable scanning microscopes, which are vacuum-bonded by applying them to the object to be observed, it is difficult to use conventional methods of joining individual tube parts, such as those used in prior art electron optical tube tubes. Low accelerating voltage of portable scanning microscopes and achieving the lowest possible weight forces the manufacturer to use the thinnest walls of the tube as there is no danger of harmful electromagnetic radiation. In these cases, the joining of two or more rotating bodies causes structural difficulties. Commonly used couplings are relatively robust to the tube and disadvantageous for these new constructions.

These prior art drawbacks are eliminated by the device for connecting two rotating parts of the magnetic circuit, in particular electron scanning microscope lenses, in which a groove is formed within the housing of the first rotating part of the magnetic circuit, into which the spring-loaded locking ring engages the ring connected by the bolts beneath it. with a lid flange or a housing of a second rotating portion of the magnetic circuit.

Claims (2)

OBJECT An apparatus for connecting two rotary parts of a magnetic circuit, in particular electron scanning microscope lenses, characterized in that a circumferential groove (8) is formed within the housing of the first rotary part (1) of the magnetic circuit into which the spring-loaded locking ring (4 or 6) fits supporting the ring (3) connected by the bolts (5) with the lid flange (9) The main advantage of the device is a mechanically strong, inexpensive connection of two or more rotating parts of the magnetic circuit from the inside of the rotating body, not disturbing the aesthetically outer profile of the tube. BRIEF DESCRIPTION OF THE DRAWINGS The invention is explained in more detail with reference to the accompanying drawing, in which, in Figures 1 to 3, three examples of the connection of two rotating parts of a magnetic circuit are shown. 1 and 2, a circumferential groove 8 is provided in the first rotary part 1 of the magnetic circuit within the upper edge, either with a square profile (see FIGS. 1 and 3) or with a semi-circle profile (see FIG. 2). The spring-loaded locking ring 4 of the square profile, or the locking ring 6 of the circular profile, or at least three threaded segments 7 for the screw 5, as shown in FIG. 3, flexibly engages in the circumferential groove 8. As shown in FIG. 1 and 2), the ring 3 provided with the symmetrically spaced threads for the bolts 5 abuts. The cover or housing of the second rotary part 2 of the magnetic circuit is connected to a flange 9 arranged inside or outside the second rotary part 2 of the magnetic circuit. The apparatus is assembled according to FIGS. 1 and 2 as follows. First, a springed locking ring 4 or 6 of a square or circular profile is inserted into the circumferential groove 8 of the first magnetic circuit part 1. Inside the first rotary part 1 of the magnetic circuit, a ring 3 is inserted tightly. After the second rotary part 2 of the magnetic circuit is applied, the two connected rotating parts 1 and 2 of the magnetic circuit are pulled through the holes in the flange 9 by means of a ring 3. The assembly in FIG. in a similar manner, but with the difference that at least three segments 7 arranged in the circumferential groove 8 replace the ring 3 and no longer require a locking ring 4 or 6. The vacuum seal is provided by a sealing ring disposed on the contact surfaces of the two rotary parts 1 and 2 of the magnetic circuit but they are not drawn in the figures to simplify the sketch. SUMMARY OF THE INVENTION or the housing of the second rotary part (2) of the magnetic circuit. 2. Apparatus according to claim 1, characterized in that at least three segments (7) connected by screws (5) with the cover flange (9) or the housing of the second rotary part (2) of the magnetic circuit are inserted symmetrically in the circumferential groove (8). 1 drawing 266868 Fig. 3