DD233210B5 - Microscope objective for variable immersion with constant adjustment length - Google Patents

Description

For this 2 pages drawings

The invention relates to a microscope objective according to the preamble of claim 1.

Such an objective is described in DE 2 655 041 C2.

Variable immersion microscope objectives differ from those for special immersion by a particular range of immersion liquid refractive index, e.g. As water with η «1.33 up to η * 1.7. Lenses with low aperture can be used without immersion, d. H. η = 1.0.

In the case of a higher aperture, the image aberration correction state changing by immersion must be compensated for by changing the constructive, optically active parameters, which is described in DAS 2655041 by moving a front endplate which changes the thickness of the immersion or according to the known method of cover glass thickness variation correction mount. where an air gap between lenses is deliberately changed happens.

Microscope lenses are generally characterized by the fact that they are matched at least in sets for all magnifications or apertures with each other in the Abstimmlänge (object level to thread contact surface). This only makes meaningful use of such sentences possible, since the sharpness of the captured object location is retained during the change.

This also ensures that a contact lens object is avoided when changing.

The following drawbacks have Vl lenses in the current state of the art:

1. Lens alignment is not maintained when changing lenses or using other immersion, even if they were balanced for a particular immersion.

2. Although the mutual tuning of a set of Vl lenses would be preserved if all the lenses had the same object distance, then the object focus determined by the strongest lens and the new focus on transition to another immersion would be detrimental to the danger of object contact. Furthermore, there is no comparison to objectives of special immersion or air.

Object of the invention

The aim of the invention is a microscope objective, in which only a small additional technical effort to achieve the preservation of the image sharpness when changing the immersion must be expended.

Explanation of the essence of the invention

The invention has for its object to provide a microscope objective for variable immersion, in which for the entire series of Vl lenses when using any immersion liquids and air, the adjustment length remains constant and receives the value that other lens rows also have.

This object is achieved by a microscope objective for variable immersion with constant adjustment length according to the invention in that in the known per se arrangement of the preparation protection, which consists in an outer, fixed, the Anschraubgewinde to revolver tube in which a sliding tube is performed, the entire optics contains and is pressed by means of spring pressure against a stop, the stop of this sliding tube according to the invention according to the adjustment requirements of different immersions changeable designed by means of an externally operated adjustment with scale and thereby the object distance is adjusted to the respectively required value by the back pressure of the spring.

If lenses with a higher aperture already contain an adjustment element for image aberration compensation for different types of immersion, then according to the invention a forced coupling of the adjustable stop is used for the adjustment with the mechanical elements for image aberration compensation. This also gives the opportunity to be able to optimally microscopy without knowing the refractive index of the immersion used, the refractive index of the immersion can be read by means of focusing on the adjustment.

The invention will be explained in more detail with reference to drawings. Show it

Fig. 1: a schematic representation of an objective according to the invention and Fig. 2: an enlarged view of the details according to the invention.

A spring-guided sliding tube 1, in which the captured optical parts are included, has preparation protection function and is guided in a fixed tube 2, on which there is unspecified Anschraubgewinde the lens. The sliding tube is pressed by a spring force F against a stop and held in its functional position. The stop is realized by a stop ring 3 with non-parallel end face 4, which is located on the located in the control panel 5 stop, z. B. a screw 6, is applied. By azimuthal adjustment of the operating part 5, the stop point moves on the slope of the stop ring 3, whereby the position of the stop and thus the vote of the lens is changed. With the same control panel 5, the regulation of the correction state is carried out via a thread 7.

Claims (2)

1. microscope objective for variable immersion with constant adjustment length, wherein the optical components are taken in a resiliently guided sliding tube, which is pressed by the spring force against a stop and an azimuthally adjustable control panel is provided to change the Korrektionszustandes, characterized in that as a stop slanted to the sliding direction of the sliding tube stop ring is provided, on which a connected to the control panel counterpart slides in azimuthal adjustment of the control panel. 2. microscope objective according to claim 1, characterized in that with the adjustment of the operating part for adjustment necessarily the image error correction by means of changing an air gap between lenses.