DE1164700B - Microscope lens - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY GERMAN JßT / TWl · PATENT OFFICE Internat. Class: G 02 b

EDITORIAL

Number: File number: Registration date: Display day:

German KL: 42 h - 3/01

W 26290 IX a / 42 h
August 29, 1959
March 5, 1964

The present invention relates to a microscope objective with anastigmatic image field flattening. Objectives that have become known which meet this requirement show up compared to conventional microscope objectives with a curved image field a much more intricate structure, which results in a Expresses an increase in the number of individual lenses.

In view of the high image performance, the lens sequence according to the invention has a small number of individual lenses, which are arranged in such a way that the object side of a thick, after the longer beam distance to meniscus-shaped bent lens member several converging lens members and furthermore, according to the invention, on the image side of the thick meniscus in one At a greater distance, at least one divergent lens element follows, which forms the cavity of the thick meniscus facing, the radius of curvature of this hollow surface being shorter than that of the facing raised outer surface of the thick meniscus, and the hollow outer surface of the thick meniscus is more curved than the adjacent lens surface of the preceding lens element.

The objective accordingly has at least two air spaces which have the shape of collecting lenses. In this way, it is possible in principle to get by with only seven individual lenses. To the To further reduce the difference in the spectral image position, additional cemented surfaces can be added to the Lens members are inserted, so z. B. it is advantageous, the meniscus-shaped lens member from individual Assembling lenses.

The number of cemented or non-cemented convergent lenses attached to the object side of the thick meniscus depend on the desired aperture of the objective. It may be necessary for large apertures be to increase the number of these converging lenses, as in the treatise of Boegehold, »The image field of the microscope«, in the Jenaer Jahrbuch 1950, p. 28, is expressed.

Another characteristic of the invention is that the thickness of the lens member bent into meniscus-shaped after the longer beam width is greater than the focal length of the entire lens. It is within the meaning of the invention, when the mentioned lens member is split open by air lenses or layers of air. This measure affects the correction only insignificantly.

Between the object or the cover glass on the one hand and the strongly meniscus-shaped bent front lens on the other hand, according to the invention, a plane plate or a lens with a relatively low refractive power can be used Microscope lens

Applicant:

Wild Heerbrugg Aktiengesellschaft,

Dr. Ludwig Bertele, Heerbrugg (Switzerland)

Representative:

Dr. jur. C. Kelling, lawyer,

Nuremberg, Vordere Sterngasse 23

Named as inventor:

Dr. Ludwig Bertele, Heerbrugg (Switzerland)

Claimed priority:

Switzerland of September 4, 1958 (No. 63 604)

and an axial thickness greater than 0.02 F. This creates another air lens in the form of a very thin converging lens, which turns its more curved surface towards the longer beam distance. This measure facilitates the cleaning of the front surface of the objective facing the object.

In the drawing, the subject of the invention is on

Hand of two exemplary embodiments shown schematically. In the drawings or in the following Examples, the following designations are chosen uniformly.

L denotes the individual lenses,
r denotes the radii,
d indicates the lens thickness,
I denotes the distances between the lens vertices, / denotes the focal length,
ν denotes the magnification,
Hd denotes the refractive indices for the helium line of the spectrum,
ν denotes the Abbe numbers.
Length dimensions are given in millimeters.

In all of the exemplary embodiments shown in the drawings, there is a small glass plate with a thickness of 0.33 in the immediate vicinity in front of L _1.

Example 1 (Fig. 1)

shows a total of only seven individual lenses. The meniscus-shaped lens element G consists of the lenses L ₅ and L ₆ . On the side of the longer beam _{width, after the air space / 4,} the diffusing lens L ₇ follows, where r _u with 5.661 is shorter than r ₁₀ with 10.327. on

409 537/261

on the side of the shorter ray distance there are three converging links, namely L ₁ and L ₂ and L _{3 + 4} . The radius of curvature r ₈ of the surface of the thick meniscus facing the object is shorter at 5.75 than F ₇ at 9.797.

na ν

Cover slip 0.17 + plate 0.33
results in thickness = 0.50 1.5283 58.0

Sum of the air spaces up to L ₁ = 0.60

F ₁ = -1.82
L ₁ d ₁ = 3.0 1.78731 50.6

= -2.738 4 = 0.06 1.43388 95.5 r ₃ = +24.50 4 = 1.5 > 4 = -5.638 </, = 0.10 1.64770 33.9 F ₅ = +7.719 di = 1.0 1.43388 95.5 = +4.737 4 = 2.0 ^r i = -9.797 d ₆ = 2.0 1.68893 31.2 r » = -5.75 d ₆ = 1.0 1.72000 50.3 r% = +5.943 U = 15.6 FlO = -10.327 d ₇ = 7.0 1.54814 46.0 r _n = -5.661 1.2

r ₁₂ = -9.84

Distance F ₁₂ - image = 147.4 ν = 39.0

Numerical aperture = 0.65 / = 4.18

B e i s ρ i e 1 2 (F i g. 2)

shows a total of eight individual lenses. The meniscus-shaped lens element G consists of the lenses L ₅ and L ₆ . On the side of the longer beam width, after the air space / _{4, there is} the dispersing link L _{7 + 8} , which is designed as a cemented link with regard to the better chromatic correction, where F ₁₁ with 5.477 is shorter than F ₁₀ with 9.839. On the side of the shorter ray distance there are three converging links, namely L ₁ and L ₂ and L _{3 + 4} . The radius of curvature F ₈ of the surface of the thick meniscus facing the object is shorter at 5.75 than r ₇ at 9.797.

na 1.5283

58.0

Cover slip 0.17 + plate 0.33
gives thickness = 0.50

Sum of the air spaces up to L ₁ = 0.60 r _x = -1.82

L ₁ d _x = 3.0 1.78731 50.6

r ₂ = -2.738

I ₁ = 0.06 F ₃ = +24.50

L ₂ . d ₂ = 1.5 1.43 388 95.5

r ₄ = -5.638

F ₅ = +7.719

F ₆ = +4.737

F ₁ = -9.797

F ₈ = -5.75

F ₉ = +5.943

'10

L ₇

-9.839
F ₁₁ - -5.477
F ₁₂ = +6.00
F ₁₃ = -9.469

4 = 0.10

<4 = 1.0

4 = 2.0

4 = 2.0

di = 1.0

d _t = 13.0

U = 6.5

d ₇ = 0.5 1.46450 65.8

d ₈ = 2.5 1.43 388 95.5

1.64770 33.9

1.43388 95.5

1.68893 31.2

1.72000 46.7

Distance F ₁₃ - image = 148.7
ν = 39.4

Numerical aperture = 0.65

/ = 4.196

Claims (4)

Patent claims: 1. Microscope lens with a leveled field of view, which is a thick one, on the side of the longer one Ray width, that is according to the picture, contains a lens member bent in the shape of a meniscus and on the side of the shorter beam distance, that is towards the object, several converging lens elements having, characterized in that after the thick meniscus in the direction at least one divergent lens element follows the image at a greater distance, which the cavity faces the thick meniscus and the radius of curvature of this hollow surface is shorter than that of the facing raised outer surface of the thick meniscus, and that the the hollow outer surface of the thick meniscus facing the object is more curved than the adjacent one Lens area of the preceding lens element. 2. microscope objective according to claim 1, characterized in that the thick meniscus-shaped Lens member is composed of individual lenses, which are cemented or also through air spaces are arranged separately. 3. microscope objective according to claim 1, characterized in that the thickness of the thick Meniscus-shaped lens element is larger than the focal length of the entire lens. 4. microscope objective according to claim 1, characterized in that between the cover glass and the front lens is a plane plate or a weakly refractive lens with an axial thickness of more than 0.02 / is on. Considered publications:
German patent application L 3113 IX a / 42 b (published on March 8, 1951). 1 sheet of drawings 409 537/261 2.64 © Bundesdruckerei Berlin