DE7907068U1 - IMMERSION LENS FOR MICROSCOPE - Google Patents

Description

Ernst Lei'2 WctzU GmbH I i ·; ·. f: L. 7U

t »" ^{01 U> J.} "b 2O72 .. ·

21) 72. Pat Kz / Wo 12.3.1979

Immersion objective

The invention relates to an immersion objective for microscopes with an outer mount and one for it axially displaceable inner Fassuingste & l as well as with lenses fastened in the frame and in the frame part.

Immersion objectives for microscopes are used to enlarge the numerical aperture and thus the resolution, being an immersion liquid with a higher refractive index than air, the space between the front lens of the objective and the object surface fills out. Because of the almost impossible to achieve complete sealing between the outer socket and the inner one The frame part due to the inner frame part, which is axially displaceable to protect the specimen, can in particular low-viscosity iramersion oil can penetrate the line system and render it unusable. In particular inverted microscopes where the objectives are below the stage, so that, for example, to observe specimens The underside of the specimen can be viewed in vessels are often damaged in this way. Even when using immersion objectives

«Pat ΓΚζ / Wb

«Pat ΓΚζ / Wb March 12, 1979 patent department

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With normal microscopes, this risk cannot be ruled out if, after using immersion, the The lens is unscrewed and, as is usually the case, the other way around, with immersion liquid then can penetrate through the gap between the outer socket and the inner socket part. In addition, the lens must be carefully cleaned of the immersion fluid after each use required, which usually runs down on the side surfaces of the socket.

The invention was therefore based on the object of providing an immersion objective of the type mentioned at the beginning to train that prevents the penetration of immersion liquid into the lens system and a Cleaning of the immersion objective after application of the immersion liquid is facilitated.

According to the invention, this object is achieved in that a collecting ring for the immersion liquid in the area of the end face of the inner holder part is arranged, which is shaped so that it is together with the end face of the immersion objective forms a trough which prevents the penetration of immersion liquid into the holder. Appropriate the collecting ring is detachably connected to the inner holder part, which makes cleaning easier. It is particularly favorable if the collecting ring itself is also trough-shaped.

The collecting ring advantageously has the inner one Barrel part of the immersion lens on the adjacent side

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an adhesive surface. It is then sufficient to simply remove the ring to be pressed on the front of the immersion objective. According to another feature of the invention, the collecting ring expediently consists of an elastically deformable one Material, so that a simple sliding of the ring to attach it to the socket of the Immersion objective is sufficient. In this case, e3 is favorable if the collecting ring is designed in the shape of a flange is. Tight manufacturing tolerances do not need to be adhered to.

Suitable materials for the catch ring are all materials that are resistant to the usual immersion liquids, such as plastics , rubber or the like, and in the case of non-deformable rings also metals or alloys. A self-adhesive film can be used as the adhesive surface. It goes without saying that, depending on the design of the front area of the immersion objective, other known types of attachment of the receiving ring, such as screwing it onto the inner mount part, can be provided and that the receiving ring and mount can finally be firmly connected to one another when cleaning the immersion lens - for example when using Water as an immersion liquid - is of minor importance.

In the drawing, the invention is shown schematically in two exemplary embodiments. Show it

1 shows a section through part of an immersion objective with the collecting ring according to the invention attached thereto ,

Patent department

2973 ^ t'K _Z /:

3/12/1972

and

Fig. 2 also shows a section through the

Immersion objective with a receiving ring in another embodiment.

3as an immersion objective partially shown in FIG. 1 10 consists essentially of an outer socket 11., in which an inner holder part 12 is mounted axially displaceably with a front line. This is a Specimen protection is guaranteed if the front lens 13 strikes the specimen when focusing. Between the Version 11 and the socket part 12 is accordingly an annular gap lU. Through the same can Immersion liquid penetrate into the interior of the holder 11 and that is arranged therein, not shown here Make the lens system unusable. To prevent this, it is in the area of the front side, the inner one Holder part 12, a collecting ring 15 attached. This lies with its underside flat on an annular recess 16 of the holder part 12 and has a na ^ h upwardly directed edge 17, which results in a trough-shaped formation for the collecting ring 15. in the In the present case, the collecting ring 15 is at its the Recess 16 of the holder part 12 abutting underside provided with an adhesive surface 18 so that it can be easily removed and replaced if necessary.

The embodiment shown in Fig. 2 differs differs from that of FIG. 1 only by a different design of the collecting ring 15 *, which is why synonymous reference numerals are used. The catch ring 15 '

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Patent department

liier is designed as a fitting ring and lies with an attachment flaxiscn 15a sealingly on a rim 19 of the | Socket part 12, while a right angle to the | Contact flange 15a extending ring 20 on the recess Λ 6 | of the socket part 12 rests. In the present case \

is an elastically deformable | for the catch ring 15 *

Material such as hard rubber so that the \ collecting ring 15 * is particularly suitable clampingly pushed onto the Eassungsteil 12th

3/12/1979

Patent department Reference list

10 Immersion objective 11th Solution 12th Fa s sxrags part 13th Front lens 14th Annular gap 15, 15 « Anffangri-ßg 15a Investment failure 16 deepening 17th edge 18th Adhesive surface 19th Mount wreath 20th ring

Claims (1)

• t * m * _. ' Pat Kz / Wo Ernst Leitz Wetzlar GmbH March 12, 1979 . Immersion objective for microscopes ia ± t an outer mount and an inner beveled part axially displaceable therein and with lenses fastened in the mount and in the mount part, characterized in that a receiving ring (15, 15 ¹ ) for the immersion liquid is arranged. 2. Immersion objective according to claim 1, characterized in that the Au * catching ring (I5 _f 15 ') is detachably connected to the inner mount part (12). 3 immersion objective according to claims 1 or 2, characterized in that the collecting ring (15) an adhesive surface on its side resting on the mount part (12) of the immersion objective (10) (18). k. Immersion objective according to Claims 1 to 3, characterized in that the collecting ring (15) is trough-shaped. Patent department * 3/12/19 * 79 5. Immersion lens according to claims 1 to 3 »thereby characterized in that the collecting ring (15 *) as Fit ring with contact flange (i5a) is designed. 6. Immersion objective according to one or more of the The preceding claims, characterized in that the collecting ring (15, 15 *) is elastic on one deformable material.